Saturday, January 31, 2009

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in vitro fertilization, ethical issues. Principles of bioethics


In vitro fertilization is the combination of sperm and eggs in an artificial environment with In order to achieve conception. Once explained the usual technique of IVF (not a nonexistent ideal case), we able to make ethical judgments.

is usually used the following procedure: First, after selection of couples who wish to undergo the technique, and after rejecting those with little chance of success, we proceed to the stimulation hormone from the ovaries of women; it, instead of producing a mature egg that month, produces several. Normally, you get between 4 and 10 eggs, which are extracted from the woman through ultrasound-controlled puncture, always annoying and not quite free from hazards.

then husband's semen is achieved (usually by masturbation), and it is to acquire fertilizing capacity. Fertilize all eggs obtained after as, m hile these are difficult to preserve, young embryos can be frozen and stored at low temperature. Then, these embryos were observed under a microscope, which show an abnormal appearance (irregular or divisions, blastomere damage, etc.) Are destroyed. In the best-looking take three, which are transferred to the woman's uterus through a special cannula , hoping they are implanted in the uterine cavity and thus the desired pregnancy happens. Other (so-called "spare embryos") stored frozen pending subsequent use.

three embryos were transferred because the chances of pregnancy increase with the num ber embryos transferred. However, do not transfer more than three to avoid risk risks of a high multiple birth pregnancy, the risk of premature birth, and the danger that the technique is not iga their goal, a living child for the couple. There is now a general consensus transfer no more than three embryos em.

The problem with this is who asks what about all those embryos s " in stock? Do you throw? "Are used as cosmetics? "Are reimplanted in another woman? Do you use for testing? and if all this, is it permissible to use embryos for this purpose or other? are they are simple cells or something else?

To better understand this process here you can see a good video that d writes the process of obtaining embryonic stem cells from in vitro fertilization performed in the laboratory. Here will note a micromanipulation sperm to fertilize eggs and finally here embryo transfer to the uterus.

The next picture also illustrates the process:




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Friday, January 30, 2009

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The biética is the branch of ethics that aims to provide the guiding principles of human behavior in the biomedical field. Etymologically from the Greek bios and ethos: "life ethic" applied ethics human life and not human.

In the context of life sciences, bioethics is very similar to the moral questions that arose after the Second World War the prospect of the powerful and terrible nuclear weapons capable of destroying mankind, as to the limits that society would ultimately impose on the development of science in its projection technology. Likewise, the interest in this field has increased considerably since the decipher the human genetic code and raised new possibilities and new perspectives emerged scientific manipulation of nature. Within the vast field of bioethics issues as fit diverse as the release into the environment of compounds based on recombinant DNA technology, biomedical sciences and the war, research and children, sexual ethics, suicide, the policy of mandatory birth control and dehumanization and institutionalization of care.

The bioethical principles are general principles of ethics, which acquire a special modulation in accordance with certain characteristics typical of the area of \u200b\u200bactivity taking place.

The four principles outlined by Beauchamp and Childress in 1979 are:

Principle of autonomy

Principle of respect for those who impose the obligation to ensure the conditions necessary to act independently. Autonomy implies responsibility and is an inalienable right, even for a sick person. An autonomous person has the capacity to act, power to prosecute fairly the scope and meaning of their actions and accountable for their consequences.

The principle of autonomy is mandatory and should be respected as a rule, except when there are situations where people can be non-autonomous or submit a diminished autonomy (minors, persons in a vegetative state or brain damage, etc..) be necessary in this case to justify why there is no autonomy or why it is decreased. In medicine, informed consent is the ultimate expression of this principle of autonomy, making a patient's right and duty of the physician, as the preferences and values \u200b\u200bof the patient are paramount from the ethical and assumed that the objective the physician is to respect this autonomy because it is the patient's health.


Principle charitable

Obligation to act on behalf of others, to promote their legitimate interests and eliminating prejudice. In medicine, promotes the best interest of the patient but without taking into account the views of it. Assumes that the doctor has the training and knowledge that the patient lacks, so it knows (and therefore, decide) what is best for it. That is to say "everything for the patient but without him."

A first obstacle to analyzing this principle is that rejecting the patient's opinion, the first involved and affected by the situation, regardless of their opinion due to lack of medical knowledge. However, individual preferences of physicians and patients may disagree about what is prejudice and what is beneficial. It is therefore difficult to defend the primacy of this principle, because if medical decisions are made from it, leaving aside other valid principles such as autonomy and justice.


nonmaleficence principle

intentionally refrain from actions that may cause damage or harm others. Is a valid ethical everyone, not just in the biomedical field but in all sectors of human life. In medicine, however, this principle must find a proper interpretation for medical interventions sometimes harm so that good. So what is it not unnecessarily harm others. The analysis of this principle goes hand in hand with charities, to prevail on injury benefit.


principle of justice

Treat each one as consistent with the purpose of reducing inequality situations (biological, social, cultural, economic, etc.). In our society, even in health equality between all men is only an aspiration, it is intended that all are less unequal, so that there is an obligation of equal treatment of equals and unequals unequally to reduce situations of inequality.

The principle of justice we can unfold in two: a formal principle (equal treatment of equals and unequals unequally) and a material principle (determining the relevant characteristics for the distribution of health resources: personal needs , credit, property, personal effort, etc.).

public policies are designed according to certain material principles of justice. In Spain most healthcare of the population is based on individual insurance companies contracted with private health care.

Friday, January 23, 2009

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PowerPoint presentation on bioethics GM Food Health

Presentation
View more presentations or upload your own. (Tags: medicine bioethics )

Thursday, January 22, 2009

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. Myths


Un transgénico (Organismo Modificado Genéticamente, OMG) es un organismo vivo que ha sido creado artificialmente manipulando sus genes. Las técnicas de ingeniería genética consisten en aislar segmentos del ADN (el material genético) de un ser vivo (virus, bacteria, vegetal, animal e incluso humano) para introducirlos en el material hereditario de otro.

La diferencia fundamental con las técnicas tradicionales de mejora genética es que permiten franquear las barreras entre especies para crear seres vivos que no existían en la naturaleza. Se trata de un experimento a gran escala basado en un modelo científico que está en entredicho.

GMOs pose a serious risk to biodiversity and are irreversible and unpredictable effects on ecosystems. Some of the dangers of these crops to the environment and agriculture are: increased use of toxic substances in agriculture, genetic pollution, soil pollution, biodiversity loss, development of resistance in insects and "weeds" and unwanted effects in other organisms.

There are some myths about GM products that are needed to clarify, since the production of GM crops has become the future of world agriculture and we need to know the consequences of the implementation of biotechnology in food:

1. Myth: benefit to farmers worldwide. Only benefits transnational industry, as it only seeks the return and the dominance of agricultural products will focus on a few companies.

2. Myth: benefit small farmers, poor and hungry. The truth is that the market for these products is a select group of people who pay for them, limiting even more the access of food to poor countries.

3. Myth: GM not harm the world's biodiversity. Currently there is piracy de fauna y flora en los países subdesarrollados, por ser éstos los mas diversos del mundo. Se ha destruido flora y fauna en muchos lugares del mundo sin que nadie reciba un solo euro para recuperar el deterioro ambiental.

4. Mito: agricultura sostenible libre de químicos. Los insectos y bacterias de las plantas se adaptan y logran resistir fácilmente a todo tipo de modificaciones genéticas, lo que implica el uso de químicos más fuertes para controlarlas. Esto sin contar los posibles riesgos de combinar genes sin conocer las posibles consecuencias futuras.


Fuente: http://www.greenpeace.org/



Saturday, January 17, 2009

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At the request of a friend ... we returned



a fan of Independent For this I wanted to see us ... Here

spasms. Leandro Stamina!