Declaration of Commitment of Honor I declare that this Scientific Monograph is resulted of my personal inquiry under the orientaes of my supervisors and the same one never was presented in none another institution for attainment of any acadmico degree. Maputo, To the 10 of December of 2009 Author Hlder Manuel Sitoe Epigraph ' ' All the substances are poison, do not have none that cannot be considered poison. The dose will define veneno' '. Paracelsus, 1538 Dedication I dedicate this conquest to the man who was my great example of carcter, friendship and hombridade: my father. The homesickness is immense and very great pain, but I know how much to this it would leave it monograph proud. My mother and to my brothers who for me everything had made in the hope of tomorrow, I dedicate! Gratefulness For the contribution and contribution in the most distinct forms, throughout the estudantil period, register mine fraterno gratefulness to the day partners that follow nominated which also appear as representative of many others that had not been mentioned here: A God donor of perpetual and gratuitous life, for allowing the accomplishment of plus acadmica stage in my life, obliged mine muitssimo. A my supervisors, Dr.

Pita Sitoe and Eng. Khalid Cassam, for the attention, unconditional accompaniment, fruitful and permanent debates during the accomplishment of my work. Vai my deep gratefulness to the Ministry of the Education and Culture, Dpt. of Planning and the National Direco of the Agrarian Services, Dpt. of Vegetal Health, for the support during the accomplishment of this work. The Dr. Samo of the Dpt. of Mathematics of the FCNM for ajuada in the analysis the statistics and to the Srs. Bila and Cossa for the support during the field works. A all the professors of the Department of Biology and employees of the FCNM for the moral support and the teachings transmitted throughout my formation.

Preconception: a question statistics This small text intends to analyze the preconception of the statistical point of view. Frequently we hear somebody to say, ‘ ‘ man not presta’ ‘ or ‘ ‘ the Brazilian woman is linda’ ‘. These and innumerable other affirmations are based on the perception of the person pronounces who them that, in turn, the experience of it is related or of it in the life. For example, a woman who has had relationships with some men traram who it, probably, is capable to say ‘ ‘ man not presta’ ‘. However, this generalization made for it is based on its experience of life. In other words, of all the universe of men that exists, for example, in the city of it, it tried samples that traram it e, therefore, it generalized, creating a preconception, saying that ‘ ‘ man not presta’ ‘. In the truth, the sample of it in fact shows this, but this does not want to say that it does not have men fidiciary offices and neither it wants to say that they are the minority of the city.

Probably it has women that other men namoraram and that does not have the same vision of the first one that says that ‘ ‘ man not presta’ ‘. In the same way, affirmations as ‘ ‘ the Brazilian woman is linda’ ‘ they are based on the perception of the person who says this. The beauty possesss a subjective character e, when affirming that ‘ ‘ the Brazilian woman is linda’ ‘ the person is generalizing its point of view of the samples that it already saw and appreciated for all the feminine population of Brazil. Logically she has pretty women in Brazil, as well as, of the masculine point of view, must have women not so pretty thus. As it can be noticed, the preconceptions possess a statistical character indiscriminately to surpass the sample that the people has in contact during its lives for all. However, a possible one half to evaluate if ‘ ‘ the Brazilian woman is linda’ ‘ she consists of increasing the number of people who evaluate samples gotten to perhaps attributing notes to these, for example.

Carrying through this type of research with innumerable participants, trend is that if it represents more thus the population of men as well as its varied gostos and, can answer with more clarity and much more representation if, in fact, the men of one determining local one (city, parents, etc) they find in fact ‘ ‘ the Brazilian woman linda’ ‘. Everything is a question of the planning of sampling aiming at to answer to one definitive question. Of all form, for most planned that can be a research, valley the penalty to mention: ‘ ‘ all rule has its excesso’ ‘. Thus, to generalize is always, always a problematic question.

If it will be consumed with moderation makes well but in excess as any another food makes badly, because of the caffeine. Objective: To analyze if the present caffeine in the coffee makes well or badly for the professional of the education. Justification: Therefore the coffee sufficiently is consumed enters the professors in the schools, remembering that it is a stimulant that leaves the person most irritated, felt it necessity to make a survey of the risks and benefits seno would be the case to change these habits for calmantes teas as camomila and grass-candy. caffeine a chemical composition, classified as alkali, belongs to the group of xanthins, chemically assigned as 1,3,7-trimetilxantina (C8H10N4O2) medicinal Properties? He is analgesic? Cardiotnico? Digestive? Diurtico? Stimulant? Exciting substance? Intellectual Revigorante? Sudorfero? Tonic? It increases the metabolism? Stimulant of the nervous system? It diminishes the mental fatigue? Dilatar the bronchis? &#039 assists in the treatment of Diabetes Mellitus when lowering the glucose; ' Adverse effect the caffeine is associated with ssea desmineralizao, being able to contribute for osteoporose. 2. Some recent studies show to a possible relation between the consumption of caffeine and the cancer of bladder. Other studies show that the consumption of 1 xcara of coffee to the day is enough to increase the risk of stomach cancer, kidneys, pulmoes, colon and esophagus. 3.

Worsening of pictures of anxiety, sleeplessness and depression. 4. Problems in the stomach (gastrites and ulcers) and refluxo (azia). 5. Rise of the pressure arterial, of the glicemia and the cholesterol, exactly how much taken without sugar. 6. The consumption of 5 xcaras of coffee per day is associated with an increase of 300% in the risk of cardiovascular illnesses.

7. Increase of the risk of abortions and you drink been born with low weight, when consumed for gestantes. 8. Certainly it is the consumed drug more in the world, for allowed and being considered harmless by the population.