http___livro-ensino-medio.f1cf.com.br_biologia_hr_biology-54.html_1.xml
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The cancer can arise from a single cell that, by the action of various factors, mutates, multiplies by mitosis and their descendants retain this mutation, triggering a process that can lead to cancerous cells. These cells begin to di-vidir rapidly modifying its functional mechanism. They tend to be aggressive, uncontrollable, which determines the rapid growth of a tissue with different characteristics from which it originated. These cells can invade other tissues and organs spreading through the body. Photomicrograph of adenocarcinoma of the rectum: cells with various sizes, colors and shapes and condensation nuclei with atypical. Source: Histopathology performed at the Department of Clinical Morfopatologia and Cytology, Medical University of Lodz, Poland. Studies on the uncontrolled growth of the cells have indicated that, in most cases, it is a slow process, which could explain the higher incidence of cancer in the elderly. The biology to better understand the mitotic cycle of cancer cells developed the following cultivation techniques: Stimulation of the transformation of normal cells into cancer cells by exposure to carcinogens, such as viruses, chemicals, radiation, which results in a more homogeneous population, facilitating the study of their molecular biology; Stimulation of the growth of a cell population from the cells of cancerous tumors. The disadvantage is that, in general, ob-tains are a heterogeneous population, which complicates their study. Currently, some types of cancer can be diagnosed early, ie, in its presymptomatic stage through modern nuclear technology applied to medicine, such as positron emission tomography (PET). This technology offers new alternative to produce images of the human body, used for diagnosis and treatment, as well as being a model of cooperation between the various branches of technology and treatments.
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Rak može nastati iz jedne stanice koje, djelovanjem različitih faktora, mutira množi mitoze i njihovi potomci zadržati ovu mutaciju, pokreće proces koji može dovesti do kancerogenih stanica. Te stanice počinju di-vidir ubrzano mijenja svoju funkcionalnu mehanizam. Oni imaju tendenciju da budu agresivni, nekontrolirano, koji određuje brzi rast tkiva s različitim karakteristikama iz kojih potječu. Te stanice mogu upasti drugih tkiva i organa koja se širi kroz tijelo. Fotomikrografija od adenokarcinoma debelog crijeva: stanice s različitim veličinama, bojama i oblicima i atipičnim jezgrama kondenzacije. Izvor: histopatologija izvodi na Odsjeku za kliničku Morfopatologia i citologiju, Medicinski fakultet Sveučilišta u Lodzu, Poljska. Studije o nekontroliranog rasta stanica pokazali su da je, u većini slučajeva, to je spor proces, što bi moglo objasniti veću učestalost raka u starijih osoba. Biologije kako bi se bolje razumjeli mitotskim ciklus stanice raka razvio sljedeće tehnike uzgoja: Stimulacija preobrazbe normalnih stanica u stanice raka izlaganjem karcinogenima, kao što su virusi, kemikalija, zračenja, što rezultira u više homogenog stanovništva, olakšavanju proučavanje njihove molekularne biologije; Poticanje rasta stanica stanovništva iz stanica tumora. Nedostatak je da je, u cjelini, OB-zastore su heterogena populacija, što otežava njihovu studiju. Trenutno, neke vrste raka mogu biti rano, tj. u svojoj presymptomatic fazi kroz moderne nuklearne tehnologije primijenjene u medicini, kao što pozitron emisijske tomografije (PET). Ova tehnologija nudi novu alternativu za proizvodnju slike ljudskog tijela, koji se koriste za dijagnozu i liječenje, kao i da je model suradnje između različitih grana tehnologije i tretmane.