Nursing is a Profession Essay - 485 Words

Nursing is a Profession Nursing is a profession that blends the rich traditions of the past with the ever changing realities of todays health care industry. Nursing is not simply an assortment of special skills and the nurse is not simply a person proficient in performing these specific tasks. Nursing is a profession. I believe this statement to be true because of several factors. The Title 19 Code for Nurses is titled Standards for Professional Nursing Practice. The status of nursing as a profession reflects the values that society places on the work of nurses and how central nursing is to the good of society. By being a professional we imply that the person is conscientious in actions, knowledgeable in the subject and†¦show more content†¦48) Although nursing can be a very physical endeavor, it carries with it responsibilities that are strictly intellectual in nature. For instance, walking into a room to assess a patient, you have to have the knowledge of human anatomy, normal characteristics, normal vital signs, normal systems responses, etc. This is all taught and (hopefully) learned in nursing school. Nursing has a very strong internal organization of nurses that have joined together over the years into organizations such as the American Nursing Association, WVNA, WVSNA, and various other state national organizations. Not all nursing jobs are physical, some are almost strictly intellectual, such as an educator, case manager, and instructor. There are staff nurses that I work with who are motivated by the fact that they are helping others. They are energized and encouraged by just knowing that the patient?s life was saved by them. This is a motivation for entering the profession and also for staying in it when the work gets rugged and the money tight. Brenner (1984) described the 5 stages of development for the professional nurse. The stages are (1) Novice (2) Advance Beginner (3) Competent practitioner (4) Proficient practitioner (5) Expert Practitioner. The stages progress from a nursing student to the professional practitioner through growth and knowledge. (Lopez-Boyd, 1997, p. 41) Nursing is a profession. Look around you, you see competent, caring individualsShow MoreRelatedThe Profession Of The Nursing Profession1829 Words   |  8 PagesThe Nursing Profession A profession as defined has five distinct characteristics that separate it from a job. Those characteristic include; an extended education, a theoretical body of knowledge leading to defined skills and abilities, provision of a specific service, autonomy in decision making and practice, and a code of ethics for practice. Nursing as a profession demonstrates each of these characteristics on all levels. These characteristics are up held by nursing organizations such as ANARead MoreIs Nursing A Profession?1153 Words   |  5 Pages Is Nursing A Profession? Prentella Wilkerson University of Alabama at Birmingham Is Nursing a Profession? A pronounced dispute still stands of whether a job of a nurse can be considered a profession or an occupation. Merriam-Webster s Medical Dictionary defines a profession as a â€Å"calling requiring specialized knowledge and often long and intensive academic preparation† (Profession, 2013). Merriam-Webster s Medical Dictionary defines an occupation as â€Å"a practice preformed with financialRead MoreIs Nursing A Profession?922 Words   |  4 Pages Nursing is a profession that allows you to make a see people at their worst, turn it around, and nurture them become their best. Their main goal is to provide care, comfort, and support to their patients and their loved ones. This job not only changes patient’s lives, but it changes the feel of the community and world around us. Globalization connects with the field of nursing in that it is constantly creating different and better opportunities to mold and strengthen the planet we inhabit. In additionRead MoreThe Nursing P rofession1409 Words   |  6 PagesThe nursing profession is probably one of the most prominent and important sectors of health care in the United States today. According to the Institute of Medicine (2010, p. 1), the profession includes more than 3 million members. With a workforce of such size and strength, it follows that the effects of the nursing profession upon health care should be both significant, evolutionary, and highly beneficial to the population it serves. However, it has been found that a number of barriers preventRead MoreNursing as a Profession1479 Words   |  6 PagesNursing as a Profession From the dawn of time nursing has existed, in one form or another. Because healthcare varies between cultures, nurses have historically taken on many different roles: a folk healer, a healer with religious ties, and that of a servant (Ellis Hartley, 2012). Because of these various roles, some may not realize, or accept, that nursing has evolved into a much needed profession. This essay will discuss what a profession is, the criteria needed to be present in order to beRead MoreNursing Profession1208 Words   |  5 PagesGCU Accountability of Nursing Professional NRS-430 Marina Reade April 07, 2011 Accountability of Nursing Professional Every health care member is accountable to their Profession ,Public ,Self,Clients,and health care agency.Accountability means they are able to explain the reasons behind their actions. Accountability facilitates self assessment and assume ownership of job role. Porter-O’Grady Malloch(2007) replaced respnsibility with accountability. The word ‘ Responsible ‘Read MoreNursing Professionalism And The Profession Of Nursing1308 Words   |  6 Pages Nursing, at its inception, was a service provided mostly by women. Far from a profession, it was considered a vocation; often a mere extension of the wife/mother role. Nurses were perceived as servants to the physicians with little power or ability to function independently. The predominant male presence in medicine, lack of formal education offered to nurses, and the subservient nature of the work significantly hindered its professionalization. Over time, as educational standards were createdRead MoreNursing as a Profession Essay1020 Words   |  5 Pagesï » ¿ Nursing as a Profession Lisa Renfrow Oklahoma Wesleyan University Nursing as a Profession The question of whether the practice of nursing is considered a profession or an occupation is an ongoing debate, much like the ongoing debate over what defines a profession. Several scholars have outlined criteria for considering an occupation to be a profession. Given a list of scholars and their criteria for what characteristics define a profession, I have chosen the listRead MoreThe Ethics Of The Nursing Profession962 Words   |  4 PagesIn the nursing profession it is important to stay up to date on current happenings in the field. The healthcare profession is fast paced and constantly changing so it is important to stay educated on those changes. Luckily there are many journals, websites, and social media pages that do just that. Since the healthcare field is so fact based it is important that sources of information are trustworthy, reviewed, and factual. Also referred to in the writing world as authoritative. One authoritativeRead MoreThe Perception Of The Nursing Pr ofession944 Words   |  4 Pagesdiscipline, the nursing profession has evolved over time. Nurses, once regarded as housemaids and lower class citizens, now hold positions of authority and stature in our modern society. These changes in the profession are attributed to the many nurse theorists who devoted their lives to the improvement of patient care. Through their theoretical advancements, the public perception of nursing has gone from dismissive to reverential. Today, our culture considers the nursing profession to be one of the

Essay about The Seperation of Hinduism and Buddhism

The origins of Hinduism can be traced back to the Vedic traditions of the Indus Valley Civilization (Mittal and Thursby 23) where as Buddhism can be seen as originating from Hinduism, and yet they are seen as two completely different religions. Why? These religions do share some of the same practices, however there are also vast differences. The caste system is a major social institution of Hinduism, but Buddhism rejects the caste system. Buddhism opposes the idea of a soul, while Hinduism perceives the soul as being one with Brahman. Moksha and Nirvana are both the release from saá ¹Æ'sÄ ra, but the pathways to attaining release are dissimilar. One of the major Hindu beliefs that Buddhism rejects is the Caste System, or â€Å"jati† in†¦show more content†¦The interesting thing about Buddhisms repudiation of the caste system is that the Buddha was originally had very high status as a Hindu. In the 6th century BCE, a man named SiddhÄ rtha Gautama, was born in the Kshatriya caste, as a Hindu prince. (Mittal and Thursby 81) SiddhÄ rtha grew up shielded from the outside world, and had everything he could ever desire within his grasp. (Esposito, Fasching, and Lewis 398) He never knew much of the world until he ventured beyond the palace walls and saw what are now known as the Four Passing Sights. There were an old man, a sick man, a corpse, and a religious mendicant. (DKWR 62) This was SiddhÄ rtha’s first exposure to suffering and religious ascetics. He rejected his high status, and left everything behind to discover his way as a forest dweller. (Esposito, Fasching, and Lewis 398) Eventually SiddhÄ rtha would create a reform group, that would become known as Buddhism and he as the Buddha. Buddhism may not have a caste system, but the religion does have a large monastic order. These monks and nuns are the â€Å"sons and daughters of the Buddha† (Esposito, Fasching, and Lewis 406). Anyone, despite age or caste can be a Buddhist, worship freely, and join a monastic life style. (Mittal and Thursby 81) In Hinduism you have to be of the upper castes, and there are no specific monastic groups. There are many types of Hindu ascetics who live mostly inShow MoreRelatedAP Human Geography Religion Notes Essay1830 Words   |  8 Pagesï » ¿Religion Unit Essay Notes 1. Secularism began to arise with the seperation of church and state in Europe. A. Why is this so? (Deblij 207, 222-224) Secularism is the indifference to or rejection of formal religion. The most secular countries today are in Europe. Secularism has become more widespread during the past century due to the rise in democracy. Democratic governments disadvantage the traditional practices of a religion because they offer freedom, whereas other forms of government may

A Brief Note On Hipaa Privacy And The Privacy - 2239 Words

Ethel Carew HIPAA Privacy Assignment- 1/20/15 How would the HIPPA Privacy policy be structured? As the Compliance Officer, I would choose the single ‘all or nothing’ approach when structuring a policy for applying the Privacy Rules. Though most cases are complex and are not as ‘cut and dry’ in the application of the privacy rules, at the end of the day, the single approach ensures simplicity and uniformity. The institution’s privacy notice will inform patients that the hospital may talk to family members and other individuals involved in their care and that minimal information about them included in the hospital’s directory can be provided to individuals that ask for the patient by name. The patient will however be giving the option to opt out of this. If they opt out, no information will be disclosed, if they do not then the hospital will use its discretion and professional judgment in making a decision that in the best interest of the patient as to who to disclose to. Hospital staff will be train on how to obtain use judgment on how to informally obtain information based on circumstances about a patient preference for disclosure of their PHI. Case #1 From whom would you likely receive requests for information about these children and their condition? On a single approach privacy. I would prioritize as to who and what PHI will be disclose based on a need to know basis. In this case, I would expect the following individuals to reach out to the hospital for informationShow MoreRelatedA Policy That Governs All Business Associates Of Gfmc On All Forms Of Mobile Devices1521 Words   |  7 PagesBUSINESS ASSOCIATE A business associate is an individual or entity that is not a member of your practice’s workforce who uses or discloses PHI to carry out certain functions or activities on behalf of the medical practice or other covered entity. Note: Access to PHI should only be granted if these parties need access to perform services for or on behalf of your practice. LIST OF BUSINESS ASSOCIATES OF GFMC †¢ Accountant who needs access to PHI for purposes of auditing accounts †¢ Answering serviceRead More Electronic Health Record Essay1295 Words   |  6 Pagesdifferent healthcare settings by network-connected information systems. Such records may include key administrative and clinical data relevant to that persons care under a particular provider. Examples of such records may include: demographics, physician notes, problems or injuries, medications and allergies, vital signs, medical history, immunizations, laboratory data, radiology reports and billing information (www.cms.gov). The EHR’s purpose can be understood as a complete record of patient encountersRead MoreThe Relationship Between Privacy And Security1531 Words   |  7 Pages 1) What is the relationship between privacy and security? Explain your answer using an example. (15 points) It is best to define what privacy and security are first before we can discuss the relationship between the two. Privacy is a concept, which applies to an individual. It deals with the individual’s right to be protected from unauthorized access to his/her personal data. On the other hand, security deals with the procedures of information being protected from misuse. This includes computer-basedRead MoreAnalysis Of Michael J. Ackerman Et Al Privacy, Mhealth, And Social Media919 Words   |  4 PagesAssociation that he attends each year. One session titled â€Å"Privacy, mHealth, and Social Media,† brought up an important question; can you ethically look up a troubling patient on social media in order to get information that did not add up during your patient interview? (Ackerman, 2013). Resulting from HIPAA only covering providers and not patients, medical information given away on social media by an individual has waved their right to privacy, giving all users access to the information posted (AckermanRead MorePatient Rights And The Hipaa Privacy Rule1978 Words   |  8 PagesNancy J. Long 823 S. George St, Front York, PA 17403 ID# 22421209 Law and Ethics for Medical Careers HIT 105 Research project number: 40936500 Patient Rights and the HIPAA Privacy Rule According to the U.S. Department of Health and Human Services many consumers want to engage in a more active role concerning their health care, therefore, it is important to know what rights you have in obtaining and protecting (called the right to access) your personal health information (Department of SecretaryRead MoreHealthcare1606 Words   |  7 PagesConfidentiality †¦In the Medical Workplace A Written Case Brief by: SheTonya Sanders Dr. Cabrera AHPH 480 The Story Sara and Jan, who are both registered nurses at Memorial Hospital, have been friends ever since graduating nursing school 5 years ago. Memorial Hospital is a state of the art hospital with a recently adopted new technology system that allows instant retrieval of medical information and an access to a greater number ofRead MoreSecurity Risks Surrounding Electronic Medical Records1994 Words   |  8 Pagesthose risks. We begin with a brief overview of the legislative history driving the rapid adoption of EMR and other health information technology. Legislation Driving Rapid Adoption of EMR Perhaps the most important piece of legislation relevant to our understanding of security risks surrounding EMR and health information technology is The Health Information Portability and Accountability Act (HIPAA), which was signed into law in 1996 by the Clinton administration. HIPAA impacts the healthcare industryRead MoreEssay Computerized Management in Healthcare3755 Words   |  16 PagesManagement in Healthcare In the past, physicians and healthcare organizations have been slow to embrace the advantages of using information technology but this is gradually changing. In the July 2012 National Center for Health Statistics (NCHS) data brief, NCHS stated that by 2011, 55% of physicians had adopted an electronic health record (Jamoom et al., 2012). The Department of Health and Humans Services stated that the percentage of hospitals in the United States using some form of electronic healthRead MoreEthical Dilemmas Of The Nursing Field2773 Words   |  12 Pages as she had previously done, and was met with resistance due to the stricter implementation of the Health Information Portability and Accountability Act (HIPAA) regulations. HIPAA defines patients and covered entities (authorized individuals), treatments that are covered, and fines in cases of contravention of its stipulations (OCR Policy Brief 2003). In the previous instance, she was given access to her son’s results due to the fact that she was familiar with the nurse on duty at the time, andRead MoreUsing Medical Record Systems And How Electronically Stored Data Can Overcome Each Limitation1169 Words   |  5 Pagescare. Thus, providers make do without past data, basing their decisions instead on what the patient can tell them and on what their examination reveals. They then write a note for inclusion in the chart—when the chart is located. In a large institution with thousands of medical records, it is not surprising that such loose notes often fail to make it to the patient’s chart or are filed out of sequence so that the actual chronology of management is disrupted in the record. When patients who have chronic

Private Detectives and Investigators Free Essays

By the time I am grown and have a family, I want to be a Private Detective and Investigator. This is something that I’ve wanted to do since I was a kid. I know it will be hard, but it is my dream job. We will write a custom essay sample on Private Detectives and Investigators or any similar topic only for you Order Now Private detectives and investigators assist many people and businesses by finding and analyzing valuable information. They connect clues to revel facts about personal matters. The assistance of a private detective and investigator can include being a celebrity protector, or finding evidence including preemployment verification and individual background profiles.Some investigators compute crimes and provide assistance in criminal and civil liability cases. They are sometimes hired to investigate individuals. Most detectives and investigators are hired to perform physical surveillance. They may also search people’s homes, locations, and cars. Private detectives and investigators could earn up to $41,000 to $60,000 in a month. The amount made depends on the employer, their specialty, and the area that they work at. The lowest a private detective and investigator can make in a month is $23,000 and the highest that can be made is $76,000 depending on the area.There are no formal education requirements for most private detectives and investigators. Many companies require a postsecondary degree. College courses in criminal justice and police science are suggested and helpful. Although some companies require related experience, some people start working as soon as they graduate from college. An associate’s degree or bachelor degree in criminal justice, police science, and police investigations is required. Most of the work that private detectives and investigators do is learned on the job.New investigators will usually start by learning how to use databases to gather information. The training that is received depends on the agency. Because detectives and investigators work with changing technologies, some of them never stop training. They learn the latest methods of many tasks by attending conferences and courses offered by different professional associations. Most states require detectives and investigators to be licensed. In the states that do not require them to be licensed have strict requirements and regulations.Some detectives and investigators receive a certificate to show that they completed a certain field. To receive this award, employees must have five years of investigation experience. They must satisfy the educational requirements and continuing-training requirements. They must also pass written and oral exams. Most private detective agencies are small, so there is little room for advancement. Usually, there are no defined ranks or steps, so advancements include a raise in salary and assignment status.Many detectives and investigators start their own agencies after gaining experience and receiving many advancements. Some detectives and investigators may be raised to supervisor or manager of the security or investigations department. Private detectives and investigators held about 500 jobs in 2008 in Memphis, TN. About 21 percent were self employed, which means they used being a detective as a second job. In the Memphis area, around 41 percent of detective and investigator jobs were in investigation and security services, which included private detective agencies.The rest of the employees in Memphis, TN worked mostly in State and local government, legal services firms, department or general merchandise stores, employment services companies, insurance agencies, and banks. A lot of competition is expected for most jobs like this because private detectives and investigators careers attract many qualified people. Most of the qualified people include many young people who have retired from law enforcement and military careers. The best opportunities for new job seekers will be in entry-level jobs in detective agencies. There will be a lot of opportunities for certain types of detectives and investigators. How to cite Private Detectives and Investigators, Papers

Euthanasia Essay Research Paper Euthanasia Right or free essay sample

Euthanasia Essay, Research Paper Euthanasia: Right or Incorrect Euthanasia comes from a Grecian term good decease. However, the word has gained a much more complicated significance in the recent times. Euthanasia is a rationally considered program to stop a life because of hurting and agony due to a terminal unwellness. The contention environing mercy killing and the statements back uping or protesting the pattern have raised serious concern and jobs in the medical field for old ages, every bit good as society, and the universe as a whole. Those in favour of mercy killing, think that it should be legal and voluntary. This suggests that the patient bespeaking the service is capable of doing this determination based on the badness of their unwellness. Most advocates believe that any signifier of active mercy killing should merely be restricted to those who are terminally sick and in utmost hurting, and merely carried out by a wellness professional. Advocates of mercy killing argue that # 8220 ; mercy killing # 8221 ; is necessary because patients, peculiarly those with terminal unwellness, experience unmanageable hurting. They argue that the lone manner to relieve the hurting is to extinguish the patient. But is at that place a better manner? Those who are opposed to euthanasia state yes. They believe that the hurting is manageable and can be treated and controlled. Harmonizing to a 1992 manual produced by the Washington Medical Association Pain Management and Care of the Terminal Patient, # 8220 ; equal intercessions exist to command hurting in 90 to 99 % of patients. # 8221 ; Some believe that patients are giving up excessively shortly, and aren t seeking to get by with the hurting or taking steps to ease the hurting, they are merely looking for an easy manner out, which in this instance is euthanasia. They fear that if mercy killing is legalized that a human life would intend less. Fear that physicians will hold more power in which they could kill their patient without their permission. Many fear that mentally and physically handicapped people will non have the same intervention as everyone else and that their lives would intend less than a healthy individual. They believe with euthanasia the United States will turn into a Nazi Germany with mercy killing cantonments spread out through the state. They believe the mentally ill, physically disabled, and old will be killed without their permission. That is where the argument over which signifier is acceptable. There are two types of mercy killing: inactive mercy killing and voluntary active mercy killing. Passive mercy killing is merely stoping unreal life support in order to protract life. By some it is considered good medical pattern, and is normally performed on terminally sick patients. Terminally sick patients are those who can non go on to populate without medical engineering helping them, and besides will neer be witting or coherent, due to encephalon harm or other causes, of all time once more. There are three ways that this process is performed. One is a life will. This is where a individual of sound head and organic structure prepares a legal papers, normally before they fall badly, stating that they do non desire any extordanary life salvaging techniques performed during cardiac failure. The second is where a individual hands over all their medical determinations to a individual to whom they have discussed all their wants about how far they wish the physician to travel before ha lting medical intervention. The concluding manner is normally the most hard. It is when a patient has lost concision and will neer recover it. Then it is up to the household if they want farther medical intervention or wish to allow nature take its class. Most feel the life will is the best class of action due to the fact it clearly states patient s wants in a lawfully binding papers. Active mercy killing involves knowing rushing the decease of a terminally sick patient who requests to avoid painful and drawn-out decease. Active mercy killing is merely the patien T petition to stop their life, either because of endless or tormenting hurting, or because they will neer retrieve from their unwellness or disease. There are documented instances of this signifier of mercy killing in Holland. Although non yet legalized it is normally practiced. They re rigorous guidelines regulating this type of decease. The patient must bespeak this action at least two times. They must be terminally sick and in utmost hurting and besides have a limited clip to populate. Before the physician can continue with the patient s petition he must acquire a 2nd physician sentiment that has no fond regard to the instance. Euthanasia has become an highly volatile issue in our society. The inquiry of ethical and legal positions cocks patients and their physicians. Within the subject of mercy killing another struggle arises over the most humanist manner to stop one s agony: inactive or active mercy killing. By society s present criterions, inactive mercy killing is considered more humanist than active mercy killing because it is letting nature take its class. However, voluntary active mercy killing can be more humane for the terminally sick if judicial admissions and precautions are made in the execution of its usage. In Washington a measure was laid before the electors on whether active mercy killing should be allowed within the province. Although rejected by little more than 20 % most argue it was obscure and guidelines were excessively indulgent Euthanasia is frequently confused with aided self-destruction, a similar event with a much different significance. Assisted suicide consists of a individual administrating a drug in order to assist another in perpetrating self-destruction. There are two sorts of mercy killing. Passive mercy killing occurs when a individual is in a relentless vegetive province. Life support would be removed, or all medical processs would be stopped. Active mercy killing, decease is caused through a direct action. In most instances a physician is giving analgesics to a patient in doses strong plenty to alleviate the hurting. This process will decelerate the respiration and rush the patient s decease. This is ever frowned upon by most of the medical profession, but is normally over looked. Most physicians feel it was the lone manner to halt the patient s chronic hurting and a opportunity they felt needed to be taken. The most good known individual to execute assisted-suicide would be Dr. Jack Kevorkian. There are well-documented state of affairss where Dr. Kevorkian has performed assisted self-destructions with a machine he had created in his trim clip. Due to his actions the argument over physician assisted mercy killing has increased. The argument is whether the physician has plenty medical information to decently find that the patient is genuinely suffering and is terminally ill. Dr. Kevorkian has faced a jury legion times but has neer been found guilty. Due to the obscure Torahs on assisted-suicide, many provinces have passed Torahs to prohibit such actions based on the actions of this adult male. He maintains that he will assist any terminally sick patient who wishes to set an terminal to their hurting and agony. Most people on both sides of the argument disagree with Dr. Kevorkian s actions. Most feel he acts in hastiness. None of his aided self-destruction victims were his patients. He did non cognize their medical or mental history. Most of his victims were aged and were known to fear turning old and no longer being able to care for themselves. The younger patients of his were known to endure from utmost instances of depression and hence could non rationally do their ain determination on whether or non go on populating There is no denying the contention associated with the subject of mercy killing. There are many sentiments allied with the right to stop one s life if they are enduring. Some groups feel that it should be illegal, others feel it should be legalized. Regardless, the inquiry remains, should a individual be given the option to bespeak aid in deceasing?

African Americans essays

African Americans essays In the period after Reconstruction the position of African Americans in southern American society steadily deteriorated. After 1877 the possibilities of advancements for African Americans disappeared almost completely. African Americans experienced a loss of voting rights and political power created by methods of terrorization such as lynching. The remaining political and economic gains that were made during reconstruction were eventually whittled away by Southern legislation. By the 1900s African Americans had almost no access to political, social, or economic power. Shortly after this Jim Crow laws began to emerge, segregating blacks and whites. This dramatic transition from African American power to powerlessness after reconstruction gave birth to two important leaders in the African American community, Booker T. Washington and W.E.B. DuBois. Although these two remarkable men were both in search of a common goal, their roads leading to this goal were significantly differen t. This is most evident in the two most important documents of the mens careers: Booker T. Washingtons, 1895 Atlanta Exposition Speech and W.E.B. DuBois response to this, The Souls of Black Folks. These two men were both dedicated to solving the difficult problems African Americans experienced in the post reconstruction south. Both DuBois and Washington wanted economic prosperity for African Americans but they differed on what would be done to achieve this. Both men focused on education as a key to the improvement of black life but they differed on the form education should take. The true difference in these mens extremely different routes to better the lives of African Americans after reconstruction was a product of their extremely different backgrounds. In this essay I will examine the documents, 1895 Atlanta Exposition Speech by Booker T. Washington and W.E.B. DuBois, The Souls...

Use of Cholinesterase Activity in Environmental Monitoring †Research Paper

Use of Cholinesterase Activity in Environmental Monitoring – Research Paper Free Online Research Papers Use of Cholinesterase Activity in Environmental Monitoring: Importance of Kinetic Parameters Determination In Estaurine Fish Research Paper Abstract The aim of the present work was to determine the kinetic parameters and cholinesterase (ChE) activity from two teleost fishes: the croacker Micropogonias furnieri (Scianidae) and sea catfish Cathorops spixii (Ariidae), to verify their suitability as sentinels of aquatic pollution by anticholinesterasic compounds. Fish were collected in a reference and in a polluted site in Southern Brazil and brain ChE was used as enzyme source. Inhibition kinetic parameters employing ChE from C. spixii showed that fish collected in the reference site presented more affinity (Ka) for eserine than those collected in the polluted site and the contrary was observed for the carbamylation constants (Kc), overall resulting in similar inhibition constants (Ki). Considering the extremely low sensitivity to in vitro inhibition by eserine, M. furnieri seems to be an unsuitable species to be employed as an environmental sentinel for pollution of anticholinesterasic compounds. Results obtained in the present study point to the importance of kinetic studies when cholinesterasic activity is employed as a biomarker in environmental quality monitoring programs. Keywords: biomarkers, cholinesterase, eserine, fish, kinetic parameters, estuarine environments 1. Introduction Some pesticides, including organophosphorus and carbamates, are known to selectively inhibit cholinesterase (ChE) activity (Valbonesi et al., 2003). When directly released into the environment, these molecules can reach rivers and sometimes the sea, leading to the contamination of various aquatic ecosystems (Mora et al., 1999). The relationship between the presence of these kind of compounds and ChE activity has been widely studied and employed as a biomarker in aquatic invertebrate and vertebrate species (Bocquenà © et al., 1997; Sturm et al., 1999; Rodriguez-Fuentes Gold-Bouchot, 2000; De la Torre et al., 2002). The use of biochemical measurements in organisms as an indicator of pollution can complement chemical analysis, giving information about the adaptive or deleterious responses in organisms exposed to a certain amount of chemicals. Moreover, among biological effects of pollutants, biochemical ones occur more quickly, thus providing earlier warning signal before other toxicological end points, including death, are evident. (Livingstone, 1998). Since organophosphorus and carbamates have a relatively short half-life, the assessment of cholinesterase (ChE) inhibition is a useful tool to evaluate their environmental impact on aquatic biota, even when they are not longer detectable in the environment (Valbonesi et al., 2003) and, as mentioned above, considerable efforts have been made in the last two decades to develop and validate measurements of biological parameters to complement the information given by the chemical analysis of contamination. The main advantage of using biomarkers at low levels of biological organization is the possibility to detect deleterious effect pollutants before being evidenced at higher levels of biological organization. Among biochemical markers, the measurement of fish cholinesterase activities has become a classical tool for biomonitoring pollution in marine (Bocquenà © et al., 1990) and continental waters (Sturm et al., 1999). However, before employment of ChE as a biomarker of anticholinestera sic compounds in monitoring programms, is important to analyze the sensitivity to this kind of molecules (Varà ² et al., 2003), also for the fact that potential effects of organophosphorus and carbamate pesticides are widely variable for different fish species (Ferrari et al., 2004; Silva Filho et al., 2004). The dynamics of the interaction of ChE with organophosphate and carbamate compounds has been shown to depend largely upon the affinity of a particular insecticide for the enzyme, commonly represented as the enzyme affinity for a particular insecticide, which is commonly represented as the affinity constant Ka (Wang Murphy, 1982). Silva Filho, et al. (2004) showed extremely great differences in the inhibition kinetic parameters between several fish species, an important point to be considered in the selection of a sentinel organism in biomonitoring programs. In this context, the concentration of eserine that inhibits 50% of cholinesterase activity (IC50) and inhibition kinetic parameters are important characteristics for the selection of sensitive ChEs to be employed as biomarkers. Considering the facts previously described, the objectives of the present study were to determine the kinetic parameters and eserine sensitivity of brain ChE from two estuarine fish species, Micropogonias furnieri (Teleostei: Scianidae) and Cathorops spixii (Teleostei: Ariidae) collected in polluted and non-polluted sites in Southern Brazil. The white mouth croaker Micropogonias furnieri (Desmarest, 1823), is a subtropical fish found in muddy and sandy bottoms in coastal waters. Its feeding habit varies along the ontogenic development and season: juveniles feed on benthic migratory crustaceans and sessile mollusks, while adults are benthic feeders, occasionally preying on fish (Isaac, 1998). Sea catfish Cathorops spixii (Spix and Agassiz, 1829) is a demersal tropical cat fish found in shallow coastal marine waters and brackish estuaries, lagoons and river mouths, as well as in hypersaline waters. In South America, its distribution includes Atlantic and Caribbean rivers and estuaries from Colombia to Brazil. Adults feed mainly on invertebrates and small fishes, while juveniles feed on amphipods, isopods and copepods (Cervigà ³n et al., 1992). This study is part of a research project developed along the Brazilian coast, the RECOS (â€Å"Uso e Apropriaà §o de Recursos Costeiros†) project in the scope of the Millenium Institute (Brazilian Ministry of Science and Technology). One of the objectives of RECOS project is the standardization of sampling protocols, quantitative and qualitative evaluations of biochemical, physiological and histological biomarkers in different animal species collected from polluted and non-polluted sites. In the present study biochemical biomarker responses were analyzed in fish collected in different seasons (winter and summer), to evaluate the natural variability of ChE activity and its sensitivity to eserine inhibition. 2. Materials and methods 2.1. Chemicals Acetylthiocholine iodide, eserine (physostigmine), 5, 5’-dithiobis (2-nitrobenzoic acid) (DTNB) were obtained from Sigma (St. Louis, MO). The protein content was determined using a commercial kit from Doles Reagentes (Belo Horizonte, Brazil), based on Biuret method. 2.2. Organisms Micropogonias furnieri was collected in summer and winter seasons in reference (unpolluted) site, â€Å"Ilha dos Marinheiros† (32 °02’005† S and 52 °12’151† W) and in a polluted site, â€Å"Saco da Mangueira† (32 °04’369† S and 52 °06’473† W). Cathorops spixii was collected only in summer in a reference site, â€Å"Baà ­a das Laranjeiras† (25 °31’271† S, 48 °29’690† W) and in a polluted one, â€Å"Baà ­a de Parangua (25 °21’050† S, 48 °25’97† W) (Figure 1). In every case, ten fish were collected in each season and site. Immediately after collection, fish were anesthetized with benzocaine (200 ppm), measured (total length and weight) and head isolated and stored at -20 oC until arrival at the laboratory, where they were kept at -80 oC before biochemical determinations. It should be mention that up to date no chemical characterization was perfo rmed in the locals referred as polluted and unpolluted. However, the local â€Å"Ilha dos Marinheiros† is far from any obvious pollution source, whereas â€Å"Saco da Mangueira† is located near to fertilizer industries. ELTON/ADALTO/VANESSA: Uma frase equivalente para os locais de amostragem no Paranagu seria importante a meu ver. 2.3. Enzyme extraction Fish whole brain was dissected and then homogenized (1:20) in cold phosphate buffer (0.05 M) containing 20% glycerol at pH 7.40. The homogenate was then centrifuged at 850 xg (4 °C) for 15 min. The supernatant was again centrifuged at 12,800 xg (4 °C) during 15 min. The supernatant of this last centrifugation was used as enzyme source. 2.4. Enzyme assay Cholinesterase activity was determined using the method described by Ellman et al., (1961). Phosphate buffer (0.05 M, pH 7.40) was placed at least for 15 min in a water bath at 25 °C. Aliquots of homogenate, DTNB and substrate (acetylthiocholine iodide- ATch) were then added and the absorbance (412 nm) was immediately determined, during 90 s, in an ELISA reader (Victor 2, Perkin Elmer). To determine substrate affinity (Km) and maximum cholinesterase activity (Vmax), different ATch concentrations ranging from 0.025 to 9 mM were assayed, being the cholinesterase activity expressed as nmol/min/mg proteins. In each experiment, a first blank without substrate was assayed to evaluate the reaction of protein thiol groups with DTNB, and a second blank without sample was used to estimate the rate of spontaneous substrate hydrolysis. 2.5. In vitro enzyme inhibition by eserine The sensitivity of brain ChE to inhibition by eserine was investigated. ChE activity was measured on extracts after 5 min of incubation at 25 °C with several eserine concentrations, ranging from 110-4 to 1 mM. Enzyme activity was measured as described above. Inhibition was expressed as a percentage of ChE activity after eserine exposure respect control enzymatic activity. Kinetic parameters of enzyme inhibition were also estimated employing the carbamate eserine. The inhibition of an enzyme (E) with an inhibitor (I) can be summarized as follow (Main, 1964): where (EI)R represents a reversible enzyme-inhibitor complex and (EI)I an irreversible one. The affinity equilibrium constant is defined as Ka= K-1/K1 and Kc represents the carbamylation constant (Hastings et al., 1970). The bimolecular inhibition constant, Ki is defined as Ki= Kc/Ka. The constants Ka and Ki can be estimated according to the following equation: 1/i = ?t/(2.303*?log10 ?)*Ki – 1/Ka, where i represents the inhibitor concentration and ?t/(2.303*?log10 ?) is the reciprocal of the pseudo-first-order rate of enzyme inhibition at a fixed concentration (i) of the inhibitor (Monserrat et al., 2002). Six concentrations ranging from 0.3 to 10 mM were tested, at least in duplicate and after four or five different times of incubation (range: 30-360 s). 2.6. Data analysis Enzyme kinetic parameters (Vmax and Km) were estimated by fitting experimental data to Michaelis-Menten equation. IC50 values were obtained through probit analysis (Monserrat Bianchini, 1998). Linear regression and ANCOVA was employed to estimate and compare inhibition kinetic parameters (Ki and Ka). Statistical analysis of enzyme activity was performed using ANOVA followed by a posteriori comparisons using the Newman-Keuls test. A significance level of 5% was employed in all cases. 3. Results Fish from of both species were homogeneous (P>0.05) in length and weight at the different sampling sites and seasons analyzed, and for this reason only the general mean is reported. For M. furnieri, the mean weight and total length of fish collected were 25.78  ± 7.72 g and 14.41 ±1.83 cm, respectively (n= 40). For C. spixii, mean weight and total length of sampled fish were estimated in 35.77 ±11.45 g and 16.14g ±1.56 cm, respectively (n= 40). The Michaelis-Menten constants (Km and Vmax) for brain ChE of M. furnieri showed different patterns. Km values were statistically similar (P>0.05) in all seasons and sampling sites. On the other hand, Vmax showed a complex response, since fish collected in the reference site showed higher values (P0.05) in the Km values was observed in summer, the only season analyzed. However, higher (P