Laboratório de Tecnologia Educacional BIBLIOTECA DIGITAL               DE CIÊNCIAS

Membrane Attack Complex formation through interaction of its complement system constitutive parts. The complex is typically formed on the surface of intruding pathogenic bacteria through activation of the complement system, when C5 convertase cleaves a C5 molecule into C5a and C5b. It is composed of...

This illustration depicts three different stages of embryonic development regarding two species: a fish and a chicken, as shown on the drawing. Fish have only the yolk sac as extra-embryonic tissue. These structures in chicken comprise, besides the yolk sac, the amniotic cavity, chorion and allantoi...

Breve discussão sobre o dilema termonidâmico da vida.

32 cm. The body is green. There is a red and yellow area below the wings. There is a pale area around the eye. The male’s body and beak are stronger than the female’s. The beak is light brown in the immature individuals. Distribution: From the Guyanas to Argentina. Habitat: Forest borders, cerr...

91cm. The neck and the legs are thin and long. All white, but with iris, beak and legs yellow. Distribution: Throughout the world. Habitat: Lakes, rivers, ponds, reservoirs, swamps, mangroves, estuaries and even polluted rivers. Diet: Eats fishes, amphibians, insects. The author witnessed a...

Spider popularly known as Pope-flies, pertaining to the Salticus sort, with diurne habit.

15 cm. It is a small sparrow with the head striated in black and white. There is a topknot and a rufous collar around the neck that is more evident in the male. The back and the wings are brown. The immature does not have bands in the head. Cinnamon and albine mutations are not uncommon. Distribut...

25 cm. The body is brownish grey, with the upper parts darker . The tip of the tail is white. There are two horizontal black bands in the sides of the head and on the wings. The male is bluish on the top of the head. Distribution: South America. Habitat: Open fields, cerrado, caatinga, crops, ...

11 cm. The beak is grey. During the breeding season the male has bluish black feathers with white spots under the wings. When not breeding the feathers are black with white tips. The female is light brown. The subadult males are similar to the non-breeding adult but with the tip of the feather brown...