Hormones on Sexual Arousal Essay Example | Topics and Well Written Essays - 500 words

Hormones on Sexual Arousal - Essay ExampleIt is easiest to study male and female arousal in other primates because we read greater control (Carlson, 2002) .The ability to mate is not controlled by ovarian hormones. A woman can have sexual intercourse at any time in her cycle. This makes it difficult to know exactly how much influence ovarian hormones have on arousal. Most studies show that these hormones have only a minimal issue on female arousal. It should be noted that these studies have been done on married women who are with their partner daily. It should be considered that a woman may take part in intercourse because of her husbands desire. Studies of female monkeys have shown that the menstrual cycle does have a strong effect on female arousal (Wallen, 2003).Studies of married women show that these females were, when tested through their entire cycle, more aroused when their testosterone levels were at their amplyest. When the adrenal glands, the gland that produces androg ens, are take from female monkeys the sexual drive of the money was greatly reduced. Adding testosterone reinstituted sexual arousal. Oxyctocin levels also seem to place a role in arousal. Higher levels start contractions of the womb and the vagina that accompanies orgasm. It is likely that the pleasant afterglow that follows intercourse is also due to oxyctocin (Wallen, 2003).Pheromones are generally odors that are generally received through the olfactory portion of the brain provided can also be absorbed through the skin. These pheromones tend to enhance hormone production in the female including oxyctocin. That would give a second comment as to why touch enhances hormone production. There is also evidence that vision influences the production of oxyctocin (Wallen, 2003). Researchers are beginning to believe it is the combination of high testosterone levels and high oxyctocin levels that motivates female arousal. If both

Suitable media(a song, poem, cartoon, etc.) that can be used to Essay

Suitable media(a song, poem, cartoon, etc.) that can be used to illustrate a concept - Essay ExampleThese are organisational behaviors that are undesirable but they depict how employees would behave if they are demotivated and lost faith leadership ab start their leadership by thinking (which later influenced their actions) that their agreement represents each that is soulless and wrong. The most obvious negative element present in Initech was the alienation of employees. The first kind of alienation was the inability of the beam Gibbons, Michael Bolton, Samir Nagheenanajar and Milton Waddams to appreciate the fruits of their labor because they cannot concretely connect how their jobs contribute to the software they are creating that made that Peter to stare at his computer all day. They despised their extend and this alienates them from it which their rebellious and antagonistic behaviors showed. As a result of the alienation from work, Peter et al felt alienated from themselves because they feel that their jobs are sucking the life out of them with Peter Gibbons remarking We werent meant to spend it this way. Human beings were not meant to sit in little cubicles staring at computer screens all day. ... Workers fall into place of what they do by the rational legal authority vested to its bosses which in the movie Office Space case was Bill Lumbergh whom the protagonist workers hated because he represent all that is soulless and wrong. It is important to stress that despite Peter, Milton, Michael and Samir loathe of Bill, Bill still continue to lord over them as Vice President because the coordinate of the brass section provided him the legal authority to be the boss no matter how hated he was. This set up is what Weber called to be the iron confine of bureaucracy that employees are still in the organization even if it is spent in Gibbons terms filling out useless forms...and listening to eight distinct bosses drone on about mission statements because t hey needed the job. In plain language, the job may suck but they have to be there to counterbalance a living because there are bills and mortgages to pay. There may be no prison bars but certainly, the formal offices which Weber described as the place they do their specialized skills and reason to be in the organization also felt like a prison cell. Thus, the person in the organization is diminished and turned into a soulless or alienated bureaucrat because he or she still has to be there no matter how horrifying the job and organization is. The movie of course is an exaggeration just like any other narrative to underscore certain points of which the moviemakers intend to impart to its sense of hearing which in this case organizational behavior of discontented and unhappy employees. One of these exaggerations is the penchant of their boss Bill to write memos reflective of Webers record of organization to abide by formal written communications which in this case,

Spartiate King Essay Example for Free

Spartiate tabby EssayDemaratus, a Spartiate King, was deposed by the Ephors after questions almost his heritage had been raised since the Kingship was hereditary and also primogenitive meaning that the specify of King was passed on to the oldest son and not the most talented or popular. One of the Ephors acted as the Eponymous Ephor, from the 5th Century BC onwards, meaning that this particular Ephors bod was used as a dating system for Sparta which made it kinda reliable due to the fact that each Eponymous Ephor was only elected erstwhile in their entire lifetime. In addition to this, the Ephors were able to discipline and fine any citizens for breaches in the laws of Sparta on the spot which differs greatly to the causality displayed by some other aspects of the Spartiate Constitution such as the Gerousia or the Kings. However, one problem with this aspect of the power of the position of Ephor, was the fact that an individual only held the position of power for a year, after which they would return to normal citizenship gum olibanum putting them on par with those whom theyd previous fined and disciplined.As a result of this eventuality, its doubtful that the Ephors used their position as effectively as they could have since they knew of a backlash which would occur once they stepped down from the position. Also, the Ephors received foreign ambassadors from other Greek Poleis instead of the Kings or the Gerousia thus suggesting that they were the portion of the Constitution that interacted with other Poleis instead of the Kings a role which would place them higher than the Kings since itd be their behaviour and interactions which the ambassadors would base their ratiocinations upon and not that of the Kings.Traditionally, in societies wherein a Monarchy exists, it the govern Monarch who interacts with ambassadors from other nations and countries however, since Spartas Constitution doesnt permit the Monarch the level of power it once had, its on ly reasonable to assume that such a role would drop-off to others. The Gerousia, comprising of the 28 elders all of whom were over sixty and retired from military service and the two Kings, was the Supreme Court of Sparta they had the final say over any legal decisions proposed, found on whether or not the concourse agreed with the proposed decision.The members of the Gerousia were elected to a life-long position, though naturally they were only eligible for election if they were over sixty which timely was the age that all adult, male Spartiates retired from the military at. Once elected, each individual, was unable to be unelected and the only way they could be replaced was through their death.Unlike the Ephors therefore, the members of the Gerousia had the power of their positions to function them in building referent power with the citizens of Sparta and other members of the Gerousia thus their appointment to the Gerousia enabled additional types of power to develop and a ssist them with their agendas. However, for all the power the Gerousia had in coincidence to legal decision, they couldnt progress very far without the compliance of the concourse which would vote yes or no on a proposal from the Gerousia.If the Assembly didnt agree with the Gerousia about a proposed decision then the Gerousia had to revise the proposition and then offer it to the Assembly again. This would mean that the decisions of the Gerousia took a long time to carry out since start of all, the Gerousia had to decide amongst themselves which proposal was best, then propose it to the Assembly and, if the Assembly didnt agree, theyd have to go back and revise it again thus meaning that to implement a simple change or improvement to a pre-existing law of Sparta could take weeks or even months at a time.This then wasnt efficient and quite cumbersome of the Constitution. The Assembly itself, as aforementioned, had the power to block any laws proposed by the Gerousia but, they co uldnt speak out against the proposals instead only being able to say yes or no to the proposal and not offer an improvement or possible change to it.In addition to this power to veto any proposal from the Gerousia, the Assembly had the Positional Power which enabled them to decide on whether or not Sparta would engage on a military campaign since, afterall, the members of the Assembly were actually soldiers who served in the legions and thus would be the ones engaging in battle. Also, as an additional bonus to this, the Assembly had the power to chose which of the two Kings would lead them on the military campaign. Now, this type of decision was based on a number of things most likely on the militaristic competence of the chosen King but, quite possibly, also the charisma of the King.As it was, the chosen King would, in effect, become the General of the Army and also the strategist for the campaign making his decisions final though an Ephor would accompany the King on campaign to m ake sure he maintained the Code of Sparta whilst on campaign. In conclusion to this, I would surmise that it was the Position of Ephor which garnered the most power since the Ephors had the qualification and means to control the Kings insofar as having the power to summon, depose and even censure the King.In addition to this immense power over the Kings, the Ephors also had the power of their position to discipline and fine Spartiate citizens in much the same way a member of law enforcement does today. This then creates a diverse and dynamic position of power which enabled the Ephors to control the Kings themselves but also everyday individuals in order to maintain the Code of Sparta. Unlike the Gerousia which depended on the Assemblys agreement on proposals, and the Kings who depended on the Assembly on which King would undertake a military campaign, the Ephors were required to answer to no-one except the laws of Sparta itself.

Politics and Religion Essay Example for Free

Politics and Religion EssayTo answer the hypothetical question whether or not, if I was a political leader in the early 17th century, I would use religion to my own ends would be very difficult and daunting. At the very outset, it should be noted that the 17th century was a very exciting period. It was characterized by major movements, shakers, upheavals and pivotal points. To be brief and concise, allow me to offer a timeless, albeit simplistic answer to this above mentioned hypothetical question. My answer would be NO, and I offer three reasons to back my answer.1. Politics and Religion must never mix. Most democratic countries decl be in their state principles and policy that there should be a separation of Church and State. So much so, matters of spiritual import can not and must not exist alongside matters of political and worldly dominions. To mix both would be to invite chaos and perhaps, bigotry, social injustice and create inequities due to over zealous religiosity. 2. Lessons in History separate us that spiritual standards imposed by those who wield political influence crumbled in time.Such lessons definitely point out that indeed, sound judgment ordain that a political leader should not use religion to advance his own ends. We see abdications, uprising and other violent overthrows and civil uprising involving religious disquiet and bigotry towards political leaders, not only in the 17th century, but all throughout history, when religion is used by political hands. Religion, macrocosm the opium of the masses may prove beneficial at times, but in the long run, like the effect of drugs or opium, people come to their senses, and again, as preceding pointed out, there must be a separation of matters of faith and matters of state.3. Using religion to advance ones ends, no matter how noble is chastely wrong. One should use sheer power of conviction, political will and strength of character and unbridled and sterling leaders qualities if one is to be an effective political leader. The use of spirituality or religion in advancing ones political ends is a moral wrong. This by example, as the Spaniards once were, is called mammon later on Christ/Cross. Up until now, the Roman Catholic Church is plagued and beset by the wrongs committed by the Church officials during the dark ages.This only shows that again, Religion and Politics are two incompatible concepts, and should be avoided. While an enlightened governance or political leadership is a paradox, it should not be an impossibility. After all, conscientious leadership is a desired trait for a political leader, however, out and out, politics and religion should not be put out in one outfit, in particular so in such turbulent a time as the 17th century. For the above stated reasons, I reiterate my answer No. If I was a political leader in the 17th century, I will not use religion for my own end.

Mass Media In A Liberal Democratic Society

Mass Media In A Liberal Democratic SocietyWhat is the proper situation of the crowd media in a liberal elective night club? In the contemporary world, the engage of mass media has been on the increase and thusly this has not exempted its use in the semipolitical arena. In connection to this point, there is a vital role that is seeed by mass media especially in the liberal elected fellowship. As such, a liberal democratic high society is the one in which elections are fair and free while encouraging competition in the political process. This kind of state is a representative of the American, Brazilian and Canada among other such like democracies. In particular, a liberal democratic society seeks to bring evolutions in the political arena, loving and economic sectors. In this sense, the government is used as a tool of qualification developments where they are needed. On the other hand, majority rule brings ab let on vesting of authority on the citizens. In this context, the proper role of mass media in such a society may be not understood. Therefore, the undertaking of this work will sieve the proper role played by mass media in a liberal democratic society.Following this point, democracy involves a set of measures followed in the making choice of the state elite. It actually requires meaningful electoral choice that which can be made possible by the mass media which is important in either large democratic polity. In this sense, there have been ongoing arguments regarding the autonomy granted to the mass media as far as politics are concerned. Arguably, the supremacy of any liberal democratic society is direct connected to the free flow of both ideas and arguments. This is necessitated by the mass media which should in fact maintain a deliberative exchange of such ideas and arguments. From a general point of view, mass media plays a pivotal role in a liberal democratic society which is termed as a role of being a guardian of the democracy along with the defending of the interest of the public1. In actual sense, mass media plays the role of correcting the arms of the government which involve the executive, judiciary and in the larger perspective the legislative. In other words, the mass media plays a study role as the major player in the theatre of elections2.It was also noted that democracy requires inhibited public debates along with free speeches and along with this point, citizens should be equipped with the ability to touch on informed decisions of which this is accomplished by the use of mass media3. In addition, a liberal democratic society should actually provide sufficient information along with transparency in the matters of political decisions. As well, it should provide competition in terms of ideas and arguments which encourage participation from the members of the society and thus meet the demands of a democratic society. According to research, mass media has a great role to play in the context of a liberal democratic society.As such, it has been pointed that there are threesome major roles that media plays in the given society4. The most important one has been pointed out as the media acting in the capacity of a regulator against the state. In the same note of hand of thought, the media is given to the role and responsibility of ensuring that accurate as well as sufficient information is provided to the society from the larger point of view. Accordingly, the mass media has another major role to play which cannot be underrated. As a matter of fact, it should work hard to ensure that it represents race in the sense of sufficiently reflecting the range of public opinions together with the aspect of political competition5.It is important at this point to note that media has a major communication role to play in the context of a liberal democratic society. So to speak, communication entails the facilitation of the public dialogues, representation of the public, making the public to live being informed, and acting as a regulator or rather a watchdog of the structures of power which affect the wellbeing of the public. As well, media is used as a tool of fond unity and thus it is important to bring into view the major types of media systems in use to accomplish roles assigned within a democratic society. In line with this point, media covers the instruments of communication employed in nine to accomplish the roles of communication in a democratic society. As such, these instruments of communication involve books, internet, films, newspapers and TVs among others as such.In essence, democracy advocates for freedom of speech to be granted to the members of the society. In this sense, media works to represent the members within the given society of which due to the limited space, they use some members of the society to speak for the citizens and as well representatives of particular groups and communities together with other such like organization representatives. Ther efore, through the use of media, the ideas and arguments along with the information of the given people in the society is brought into public view for the necessary actions to be taken.Basically, the media is anticipate play the role of a watchdog for the public. This is to suggest that it should take the responsibility to nurture the very citizens or rather the society it is mandated to serve. So to articulate, the public is always out to see that the media is regulating the power structures of the society by exploring their functioning and and so notify the public when there has arisen some issues in the structures6. This is also accompanied by the media pointing out to the interests of the people and where they want to act.Another point to note is that a liberal democratic society as it has been highlighted requires a good flow of information. This is to suggest that the public requires to get information and to stay informed. In such as society, citizens are inclined towards making collective decisions for the societal benefit altogether. In the light of this point, democratic societies grow when there is flow of the shared information among the society members and thus it is imperative for the media to inform the society regarding the contemporary issues that need attention and the public stance in regard to them. As far as tender unity is concerned, the media acts as a tool that works to bring together the members of the society by making use of a common culture which is solitary(prenominal) achieved when the media gives the society an experience of culture that is shared.According to research findings together with arguments from various scholars, media as a key player in the flow of information in the society has failed in most of its roles. This is what has brought about the misconception of the proper role of the mass media in a liberal democratic society. However, pointing out to what should be done so that the media can play its proper role, w ill help to alleviate the burden of the media abuse in a democratic context. As such, the mass media should not seize the manipulation by the political leading who use it for selfish interest7. In the light of this point, the media should seek to ensure a universal access in that members should be given room to the right of entry to the mass media to contribute as well as gain from the public.The role of the mass media in the democratic society will be realized again when the mass media works independent from the structures of power present in the society. In all the undertakings of the media, influential leaders should be presented separately from the titles so that there may be no bias. Owing to the manipulation of the mass media by influential leaders, mostly the media may ignore the interests along with the concerns of the public and as such, this should not be done but rather the media should respond to the public interests and concerns altogether. From a more practical poin t of view, the media is expected to provide truthful and honest information if the development of the democracy is to be achieved.It has been argued that media is central to a democratic society as it leads to information accessibility at all social levels and geographical locations of a society8. Equally, mass media works as a critic inwrought to the government along with the investigations of wrong doing. In essence, mass media has its proper role as that of acting as an advocate for good along with bad causes. It is the responsibility of the mass media again to state the distinct constituencies of the democracy. So to speak, it works towards the creation of common experiences to the society while offering shared public symbols. Needless to say, it is through media that the public gets to interact with the leaders and as such solicit information from them. Accordingly, mass media plays the role of constantly reminding the society the essence of their national identity9.Following this point, the instruments of media have experienced developments which are fast linked to the technological development. This is to suggest that it is not only though books, newspapers and TVs among others that the mass media operates, but rather internet has come into the scene. Thus, it is possible for the political leaders to use the internet to influence the citizens and as well interact with them10. Of importance to note in this case is the abuse of mass media by the leaders in order to serve their self driven interest. Therefore, regulation of the mass media should be carried out so that no cases of abuse can be reported.Arguably, contemporary democracy has been pointed out as not to be working. This is given to the reason that the media has engaged in politics with the citizens engaging in the internet citizenship and thus the point of contact and development has been lost11. Besides this point, mass media has developed to a point whereby it has thus constrained leadershi p and leaders in the democratic society and thus on the other hand mass media has worked to drag back the democratic societys growth12. More to this point, arbitrated political communication in the public military capability can smooth the progress of deliberative legalizing of the processes in multifarious societies only if an autonomous media system gains self-government from its social situation and if unidentified audiences grant a criticism between a knowledgeable leader conversation and a reactive civil society13.Although there have been many challenges limiting the media from achieving its objective, it is essential to note that medias role in the liberal democratic society is paramount. As such, it serves the role of being the watchdog by regulating and criticizing the operations of the government. It provides a platform whereby the leaders of the society interact with the citizens and thus serve their needs. Debates concerning the political and social matters are carried o ut in the media and thus it serves the interests of the public. It further corrects the wrongs of the government and thus it keeps the government on check so as to ensure freedom and fairness in the society altogether.

Analytical Techniques for DNA Extraction

Analytical Techniques for desoxyribonucleic acid ExtractionDevelopment of deoxyribonucleic acid sensing elements for lavishlyly sensitive detection of sequence specific deoxyribonucleic acid has become crucial out-of-pocket to their extensive maskings in clinical diagnosis, pathogen detection, gene expression studies, and environmental monitoring.ref Along with complementary base-pair hybridization betwixt long oligonucleotide for DNA detection, several DNA sensors employ short oligonucleotide (10 base pair) to this goal. Ref Easley and co-workers constructed the electrochemical proximity assay (ECPA) for highly sensitive and highly discriminating quantitative detection of protein, where stain-induced DNA hybridization between 5, 7, or 10 complementary base system brings redox tag close to the sensor bug out resulting direct electrochemical readout.To date, many analytical techniques have been established for DNA detection, such as electrochemistry, fluorescence, surfac e plasmon resonance, chemiluminiscence, quartz crystal microbalance and so on. Ref Among these methods, electrochemical DNA (E-DNA) sensors have attracted everywheremuch attention owing to their reliability, simplicity, rapid response, broken cost and portability, down in the mouth sample consumption, ability to work in interlocking-multicomp one and only(a)nt samples and remarkably high sensitivity and selectivity.ref The basic formula of E-DNA sensor is based on immobilization of single isolated DNA analyze, a selective biological recognition element, on a sensor surface followed by incubation with sample containing the target biomolecules. When a target-induced molecular recognition event (hybridization) takes place the sensor translates that to a measur up to(p) electrochemical signal which is at one time correlated to the target concentration. In recent years, numerous enquiry groups have studied the performance of these sensors by investigating the offspring of immob ilized national structure and investigating surface density, nature of the redox reporter used, target length, ionic strength of buffer and modifying the frequency of the squ ar-wave voltammetry employed. ref Nevertheless, distance dependence of the redox tag coition to the electrode surface to achieve maximum signal has never been explored. As solid-phase hybridization is very distinct from that in solution-phase in terms of kinetics and thermodynamics, ref sensor performance may be sensitive to the location of the redox reporter because surface charge would likely alter the hybridization rate of negatively supercharged DNA which, in turn, alters the signaling properties of E-DNA sensors. Especially for short oligonucleotide (10 base pair) hybridization near surface the effect may lead to very receivable to their low binding energy which is not sufficient to overcome. Here, we describe a specificed study of the extent to which the location of the redox reporter base be var ied to achieve maximum signal within shorter response time in effort to contrive efficient E-DNA sensors with improved sensitivity.Prior to this work, these electrochemical DNA (E-DNA) and electrochemical, aptamer based (E-AB) sensors have been reported against specific DNA and RNA sequences,2 proteins,3,4 small molecules,5-7 and inorganic ions.8,9 Because all of the sensing components in the E-DNA/EAB platform are covalently connected to the interrogating electrode, the approach requires neither exogenous reagents nor labeling of the target. Likewise, because their signaling is connect to specific, binding-induced changes in the dynamics of the probe DNA (rather than changes in adsorbed mass, charge, etc.), these sensors function well when challenged with complex, contaminant-ridden samples such as business blood serum, soil extracts, and foodstuffs.5,7,9,10 These attributes render the E-DNA/E-AB platform an appealing approach for the specific detection of oligonucleotides and other targets that bind DNA or RNA.11-13In the above methods, electrochemical biosensors are much popular because of their simple instrumentation setup, low sample and reagent consumption as well as high sensitivity and selectivity (Wenetal.,2012 Lu etal.,2012 Wenetal.,2011 Farjamietal.,2011 Xia etal.,2010 Xiang andLu, 2012 Pei etal.,2011 Farjamietal.,2013 Liu etal.,2013b).Electrochemical methods,1,11 macrocosm simple, portable and low-cost, are particularly charismatic for DNA detection.1216Electrochemical methods have been used extensively in DNA detection assays, as summarized in recent review articles.15,16Among these protocols, the electrochemical biosensors have attracted particular attention in different fields owing to its small dimensions, easy operation, rapid response, low cost, high sensitivity and selectivity 10,11.Among these techniques, the electrochemical techniques have received great interests owing to its superior characteristics of rapid response, low-cost, sm all-size, simple operation, and good selectivity 13-16.Among these approaches, electrochemical methods have been shown to be superior over the other existing measurement systems,11 because electrochemical transduction possesses a potential allowing the development of rapid, simple, low-cost, and portable devices.12-14As an alternative to conventional techniques, electrochemical DNA biosensors have attracted healthy interest owing to their intrinsic advantages, including good portability, fast response, and remarkably high sensitivity (Sun etal.,2010). More crucially, a number of DNA biosensors have been developed and extensively applied for the determination of biomarkers (Huang etal.,2014).Microfabrication technology has enabled the development of electrochemical DNA biosensors with the capacity for sensitive and sequence-specific detection of nucleic acids.1-5 The ability of electrochemical sensors to directly identify nucleic acids in complex mixtures is a significant advantage over approaches such as polymerase chain reaction (PCR) that require target purification and amplification.Electrochemical DNA sensors are reliable, fast, simple, and cost- in effect(p) devices that convert the hybridization occurring on an electrode surface into an electrical signal by means of direct or indirect methods.the electrochemical DNA (E-DNA) sensor is one of them. This sensor platform, the electrochemical equivalent of optical molecular beacons, exhibits notable sensitivity, specificity and operational convenience whilst also being fully electronic, reusable and able to work in complex, contaminant-rich samples 4-6.Compared with other transducers, electrochemical ones received particular interest due to a rapid detection and great sensitivity. Combining the characteristics of DNA probes with the capacity of direct and label-free electrochemical detection represents an attractive solution in many different fields of application, such as rapid monitoring of pollutant age nts or metals in the environment, investigation and military rating of DNA-drug interaction instruments, detection of DNA base damage in clinical diagnosis, or detection of specific DNA sequences in human, viral, and bacterial nucleic acids 2-8.The determination victimization electrochemical biosensor methods has attracted much interest because of their simple instrumentation, high specificity, sensitivity, rapid, and is two-a-penny with potential for applications in molecular sensing devices.Amongst the electrochemical transducers, carbon electrodes such as smooth carbon, carbon fibre, graphite, or carbon black exhibit several unique properties.Recent engineering advances have enabled the development of electrochemical DNA biosensors with molecular symptomatic capabilities (2, 8, 18, 33, 47). Electrochemical DNA biosensors offer several advantages compared to alternative molecular detection approaches, including the ability to analyze complex body fluids, high sensitivity, compa tibility with microfabrication technology, a low provide requirement, and compact instrumentation compatible with portable devices (18, 48). Electrochemical DNA sensors consist of a recognition layer containing oligonucleotide probes and an electrochemical signal transducer. A well-established electrochemical DNA sensor strategy involves sandwich hybridization of target nucleic acids by capture and detector probes (5, 7, 46, 50).First reported in 2003, electrochemical DNA (E-DNA) biosensors are reagentless, single-step sensors comprised of a redox-reporter-modified nucleic acid probe attached to an interrogating electrode.1 Originally used for the detection of DNA29 and RNA10 targets, the platform has since been expanded to the detection of a wide range of small molecules,11,12 inorganic ions,13,14 and proteins,12,1517 including antibodies,18,19 via the introduction of aptamers and nucleic-acid-small molecule and nucleic-acid-peptide conjugates as recognition elements (reviewed in refs 20 and 21).Irrespective of their specific target, all of these sensors are predicated on a common mechanism binding alters the efficiency with which the attached redox reporter approaches the electrode due to either the steric bulk of the target or the changes in the conformation of the probe.1,12,18 Given this mechanism, these sensors are quantitative, single-step (washfree), and selective enough to perform well even in complex clinical samples.12,15 They are likewise supported on micrometer- scale electrodes22 and require only inexpensive, hand-held driving electronics (analogous to the home glucose meter23), suggesting they are well suited to applications at the point-of-care.Among these, the electrochemical detection of DNA hybridization appears promising due to its rapid response time, low cost, and suitability for mass production.11,12 The E-DNA sensor,13-16 which is the electrochemical equivalent of an optical molecular beacon,17-20 appears to be a particularly promisin g approach to oligonucleotide detection because it is rapid, reagentless, and operationally convenient.21,22 The E-DNA sensor is comprised of a redox-modified stemloop probe that is immobilized on the surface of a gold electrode via self-assembled monolayer chemistry. In the absence of a target, the stem-loop holds the redox moiety in proximity to the electrode, producing a large Faradic current. Upon target hybridization, the stem is broken and the redox moiety moves out-of-door from the electrode surface. This produces a readily measurable reduction in current that can be related to the heading and concentration of the target sequence. Both E-DNA sensors13-16 and related sensors based on the binding-induced folding of DNA aptamers23-28 have been extensively studied in recent years. Nevertheless, key issues in their fabrication and use have not yet been explored in detail.Electrochemical biosensors, combining the sensitivity of electroanalytical methods with the inherent bio-sele ctivity of the biological component, have found extensive application in diverse fields because of their high sensitivity with relatively simple and low-cost measurement systems.1 For example, by assembling artful target-responsive DNA architectures on the electrode surface, a series of electrochemical bioanalysis methods have been proposed for the sensing of specific biomarkers, such as DNA and proteins.2-5 The typical sensing schemes of these designs involve the immobilization of an efficient probe on the electrode surface, incubation with target biomolecules, and measurement of the output electrochemical signal.6,7A wide variety of nanomaterials including metal nanoparticles, oxide nanoparticles, quantum dots, carbon nanotubes, graphene and even hybrid nanomaterials have found attractive application in electrochemical biosensing, such as detection of DNA, proteins and pathogens and the design of biological nanodevices (bacteria/cells).14,15Electrochemical transducers offer broad opportunities in DNA sensor design due to simple experiment protocols, inexpensive and mostly commercially available equipment.Among various detection methods, the electrochemical approach attracted much attention due to its rapidness, low cost, high sensitivity and compatibility with portability 10,11. The E-DNA sensor 12,13, an electrochemical method derived from the optical molecular beacon14,15, is particularly promising because it is reagentlessness andoperation convenience. In brief, the E-DNA sensor is composed of a redox-modified hairpin-like stem-loop DNA probe that is immobilized on the electrode surface. Without a target, the stem-loop structure holds the redox probe close to the electrode surface, pro-ducing a large current. Upon hybridization with a target, the stem is opened and the redox label moves away from the electrode surface and the current is decreased. This current change is directly related to the target DNA concentration.Many different versions of the E-DNA sensor have been reported to date 7-9. A popular construct of this type of sensors is a folding-based E-DNA sensor comprised of a redox-labeled DNA stem-loop probe covalently attached to a gold disk electrode. In the absence of a target, the stem-loop conformation holds the redox label in close proximity to the electrode, facilitating electron transfer. In the presence of and binding to a complementary DNA target, hybridization forces the redox tag farther from the electrode, impeding electron transfer and producing an observable reduction in redox current 4-6.In this approach, a single-stranded DNA (ssDNA) probe is immobilized on a surface and exposed to a sample containing the specific complementary target sequence, which is captured by forming a double-stranded DNA(dsDNA) molecule. This recognition event (hybridization) is then transduced into a readable signal.In this strategy, the target is anchored to the sensor surface by the capture probe and detected by hybridization with a detector probe linked to a reporter function. Detector probes coupled to oxidoreductase reporter enzymes allow amperometric detection of redox signals by the sensor electrodes (28, 34). When a fixed potential is applied between the working and reference electrodes, enzyme-catalyzed redox activity is detected as a measurable electrical current (11, 16, 27). The current amplitude is a direct materialisation of the number of target-probe-reporter enzyme complexes anchored to the sensor surface. Because the initial step in the electrochemical detection strategy is nucleic acid hybridization rather than enzyme-based target amplification, electrochemical sensors are able to directly detect target nucleic acids in clinical specimens, an advantage over nucleic acid amplification techniques, such as PCR.Electrochemical methods are typically inexpensive and rapid methods that allow distinct analytes to be detected in a highly sensitive and selective manner 22-25. Although electrochemical DN A sensors utilize a range of distinct chemistries, they all take advantage of the nanoscale interactions among the target present in solution, the recognition layer, and the solid electrode surface. This has led to the development of simple signal transducers for the electrochemical detection of DNA hybridization by using an inexpensive analyzer. DNA hybridization can be detected electrochemically by using various strategies that exploit the electrochemistry of the redox reaction of reporters 26 and enzymes immobilized onto an electrode surface 27, direct or catalytic oxidation of DNA bases 28-31, electrochemistry of nanoparticles 32-35, conducting polymers (CPs) 35-37, and quantum dots 38.E-DNA sensors, the electrochemical analog of optical molecular beacons e.g.,1-4, are based on the hybridization-induced folding of an electrode-bound, redox-tagged DNA probe. In their original implementation, the concentration of a target oligonucleotide is recorded when it hybridizes to a stem-l oop DNA probe, leading to the formation of a rigid, double stranded duplex that sequesters the redox tag from the interrogating electrode 1. Follow-on E-DNA architectures have dispensed with the stem-loop probe in favor of linear probes, leading to improved binding thermodynamics and, thus, improved gain 5, as well as strand-invasion, hairpin and pseudoknot probes producing signal-on sensors 6-8. Because E-DNA sensors are reagentless, electronic (electrochemical) and highly selective (they perform well even when challenged directly in complex, multicomponent samples such as blood serum or soil) e.g., 9, E-DNA sensors appear to be a promising and appealing approach for the sequence-specific detection of DNA and RNA see, e.g., 10,11.E-DNA signaling arises due to hybridization-linked changes in the rate, and thus efficiency, with which the redox moiety collides with the electrode and transfers electrons.To design efficient DNA-electrochemical biosensors, it is essential to know the str ucture and to understand the electrochemical characteristics of DNA molecules.Motivated by the potential advantages of the E-DNA sensing platform, numerous research groups have explored their fabrication and optimization over the past decade. Specifically, efforts have been made to improve the platforms signal gain (change in signal upon the addition of saturating target) by optimizing the frequency of the square-wave potential rampemployed,11 the density with which the target-recognizing probes packed onto the electrode,11,24 probe structure,25 the redox reporter employed,26 and the nature of the monolayer coating the electrode.25Contributing to these studies, we describe here a more comprehensive study of the extent to which the square-wave voltammetric approach itself can be optimized to achieve maximum signal gain. Specifically, we have investigated the effect of varying the square-wave frequency, amplitude, and potential step-size on the gain of E-DNA sensors, evaluating each line of reasoning as a function of the others as well as of the structure of the E-DNA probe, its packing density, the nature of its redox-reporter, and the monolayer chemistry used to coat the sensing electrode.E-DNA sensors are a reagentless, electrochemical oligonucleotide sensing platform based on a redox-tag modified, electrode-bound probe DNA. Because E-DNA signaling is linked to hybridization-linked changes in the dynamics of this probe, sensor performance is likely certified on the nature of the self-assembled monolayer coating the electrode. We have investigated this enquire by characterizing the gain, specificity, response time and shelf-life of E-DNA sensors fabricated using a range of co-adsorbates, including both charged and deaf(p) alkane thiols.The signaling mechanism of E-DNA sensors is linked to a bindingspecific change in the flexibility of the redox-tagged probe upon hybridization, the relatively rigid target/probe duplex hampers the conflict of the electroche mical tag thus decreasing the observable amperometric signal 5,12. This, in turn, suggests that E-DNA signaling may be sensitive to changes in surface chemistry which, due to surface charge and steric bulk effects, would likely alter the dynamics of a negatively charged DNA probe. However, despite rapid growth in the E-DNA belles-lettres reviewed in 13 the extent to which surface chemistry affects E-DNA signaling has not been established all previous E-DNA sensors were fabricated using hydroxyl-terminated alkane thiol self-assembled monolayers (SAMs) e.g.,1,3,5,7,9. Here we address this question and describe a study of E-DNA sensors fabricated using co-adsorbates of various lengths and charges in an effort to further optimize E-DNA performance.For example, while it is likely that the signaling properties of these sensors depend sensitively on the density of immobilized probe DNA molecules on the sensor surface (measured in molecules of probe per square centimeter) see, e.g., refs 5 and 29-36, no systematic study of this effect has been reported.Similarly, while it appears that the size of the target and the location of the recognition element within the target sequence affect signal suppression,24 this effect, too, has seen relatively little study. Here we detail the effects of probe surface density, target length, and other aspects of molecular crowding on the signaling properties, specificity, and response time of the E-DNA sensor.However, the sensitivity is one of the most important limiting factors for the development of electrochemical DNA biosensors.

The Expectancy Theory Of Motivation And Company X Management Essay

The Expectancy Theory Of Motivation And Company X way EssayCompany X produces a line of audio products for the industry professional and prides themselves on the fronts to provide the highest quality available. Furthermore, the gild touted high production standards firearm attaining their goals. Implementation of a newly-designed production process to enable employees to achieve their production goals occurred and their efforts have not been successful. Observations have included a lack of effort to overshadow the process, deficiency in reaching those goals by those who have mastered it, and a lack of concern regarding goal achievement from individuals who ar regularly top producers. finished interviews and informal conversations that were conducted, employee concerns were expressed and the result has been a breakdown in the relationships and brokers in the expectancy theory of penury. The attitude of Company Xs production staff and the lack of motive to complete goals is a direct result of a breakdown in the relationships within the expectancy theory of motivation.Building the Expectancy Theory of Motivation expositionVictor Vrooms expectancy theory of motivation relates that employees within an organization will be motivated when they hold certain impressions to be true. The strength of a end to act in a certain way depends on the strength of an expectation that the act will be followed by a given way out and the attractiveness of the outcome to the individual (Robbins Judge, 2007). The theory is comprised of three relationships, or variables, that behave much like a chain. When altogether three are successfully satisfied, wherefore motivation is fully achieved. When one of the relationships is broken or out of sync, then it is not. The result is a combined lack of efficiency, minimum effort, and no goal attainment. share 1 ExpectancyExpectancy is built upon the belief that effort exerted will beget recognition of favorable surgery. Several f actors elicit interfere with this piece of the motivation equation. These variables include the belief that a worker has the skills and ability to perform their tasks successfully, how difficult the goals are to achieve and where they fall in relation to the workers expectations, and whether there is any experience over their carrying out. For example, if a departments members share the belief that no matter how hard they work, the likelihood of getting a good performance appraisal is low, then motivation will be low due to a low take aim of expectancy (Robbins Judge, 2007).Component 2 InstrumentalityInstrumentality is defined as the belief that if a person meets or exceeds expectations, then they receive a greater reward than those who do not. Instrumentality will be low if the rewards follow all levels of performance with no distinction between what is acceptable and unacceptable. It is enchantd greatly by the trust employees have in their leaders and the likelihood that the promises of reward for good performance is believable. Another factor that determines the level of instrumentality kick in is demonstrated when the workers do not trust the leaders, yet have the ability to control the rewards system by another means. This control raises instrumentality. Policies also affect instrumentality the formal documentation of devote and other rewards and benefits contributes to raising levels of instrumentality.Component 3 valencyThe third component within the expectancy theory of motivation is valence. Valence is the level of value that an individual bunss on the rewards as a function of their needs, goals, and values. The employees preferences will determine the level of valence present for motivation. If the worker desires a certain reward but receives another, the level of valence will be lower. Higher levels of valence are present when the understanding of the individual employees goals are understood by their leader and are then considered along w ith the relationship between their efforts and performance. Good effort equates to good performance when a strong relationship is present (Robbins Judge, 2007).Correcting the Motivation ProblemCompany X is experiencing dysfunction within the expectancy theory of motivation and thusly, motivation is low. The workers are not motivated to expend the extra effort to meet the high standards and production goals as a result. Expectancy is low, as are the levels of instrumentality and valence. Correcting these problems is achieved by addressing concerns to raise the levels of these three variables. acme Expectancy LevelsExpectancy levels at Company X are suffering. The employees do not put any extra effort into mastering the new production process and those who have done so are not putting forth the effort to achieve goals as the company has directed. Some of the employees stated that they cant be successful because they do not believe they have the skills to do so.Suggestions to correct these problems would include providing extra training duration to enable the employees to gain the hand dexterity they believe they are lacking. This would boost their confidence in the new process and give them the tools to achieve the new goals darn fostering the belief that the goals are realistic to meet. Boosting their skills and ability to complete the tasks successfully leads to higher performance and also returns control of their perceived performance levels back to the employees.Raising Instrumentality LevelsInstrumentality levels are faltering at Company X as well. In Supervisor Bs informal conversations with Supervisor As employees, it is noted that there is no difference in salary increases for workers who meet departmental goals and those who do not. Workers feel as if they are resigned to the rewards system currently in place and they dont see a difference in salary increases or bonuses based on merit. Recognition is therefore non-existent, and the reward for all emp loyees regardless of performance sends the violate message. Workers do not have to meet goals to receive rewards and they are not motivated to work to attain the higher standards. In fact, salary is only bear upon if performance is very slow. Because the employees do not feel the recognition for a chisel well done co-exists with more stringent guidelines for when a poor job is done, they do not put forth the extra effort. This relationship in the expectancy theory is broken.An improved system of handling performance appraisals needs to be implemented. Ideally, it would separate recognize those individuals who are putting in extra efforts to ensure that goals are being met while providing feedback for low-performers on areas for improvement. Employee incentives like raises and bonuses would be contingent on meeting or exceeding certain criteria. In restructuring, use performance appraisals, or individual performance in tandem with departmental and production goals to better chall enge and reward the workers. A low performance appraisal and poor or mediocre performance would not be rewarded at the same levels as those with high-scored performance appraisals and above average production. By creating a tiered bonus system, the bonuses would be larger and create a desire to attain that level of reward. at once this occurs and is formally documented within the company policies, instrumentality levels rise and are corrected because confidence and trust in their leaders would be restored.Raising ValenceFurther discussions with Supervisor As employees uncovered a break in the third piece of the expectancy theory of motivation, valence. The rewards offered by the company do not meet the personal goals of the workers. The bonus offered to employees is too small after taxes and the workers perception is that it is not worth their effort after taxes come out of their bonus, overtime pay surpasses the amount a bonus would provide. This information explains yet another k ey breakdown in the expectancy theory of motivation.The system is in need of restructuring so that the bonus meets the personal goals of the production workers. The Whats in it for me? question needs a suitable answer that does this. If an employee is interested in a promotion, bonus, raise, or otherwise, its important that their feedback is interpreted into consideration in offering a reward that has personal value for the workers. Boosting the valence level is satisfied and once the variables of value, needs, goals, and preferences are met, motivation will increase. destinationThe problem is three-tiered but in working within the three relationships and by breaking down each piece, the leaders at Company X can boost motivation by raising the three levels of expectancy, instrumentality, and valence. By following a checklist of issues to address, arising from the theory itself, and by bestowing rewards in an appropriate fashion, the leader is enabled to adopt an influence strategy t hat enhances levels of personal motivation (Zerbe et al, 2001). Because an employees expectancy her or his judgment about the attractiveness and probability of a prospective reward strongly influences that persons willingness to take on a new task, the result will be more effort expended by the workers to meet goals they perceive as attainable (Newstrom, 2007).