Laboratório de Tecnologia Educacional BIBLIOTECA DIGITAL               DE CIÊNCIAS

A maior barreira para penetração de matéria através da pele é fornecida pela última camada da epiderme, o estrato córneo (EC). As principais funções do EC são: controlar a perda de água transpidermal, bem como a permeação de substâncias em ambas as direções da pele, impedir a entrada de microorganismos, filtrar a radiação ultravioleta do sol e contribuir para as propriedades viscoelásticas da pele. No entanto, essa temática é pouco explorada nos livros didáticos trazendo apenas definições reduzidas sem explicitar suas funções, formação e composição molecular. Diante disso, o presente trabalho tem como objetivo apresentar uma descrição mais detalhada no que diz respeito à formação e composiçã...

16 cm. The iris and a mask in the face are red. The top of the head and the wings are ferruginous. The sides of the head are gray and the belly brown. In some regions there may be yellow areas in the chest and throat Distribution: From Mexico to Argentina. Habitat: Forest borders, secondary and gallery forests, cerrado, caatinga, parks and gardens, usually in the canopy. Diet: Insects, their larvae and fruits Reproduction: The female builds most of the nest with grass. The nest is a deep open basket covered with moss and attached to the tree with spider webs. Male and female take turns to incubate the eggs and feed the offspring (2 or 3).

16cm Identification: the genus Elaenia is well known among the ornithologists for being one of the most difficult groups when it comes to species identification. Nevertheless Elaenia flavogaster is the easiest species to be identified, first for its yellow belly, second for the crest on the head (not always visible), third for the absence of white patches on the face and crest and last for its conspicuous behavior. It is more easily heard than seen and its song reminds the one of the kiskadee. It inhabits parks, backyards, coffee crops and secondary forest edges. The yellow bellied elaenia spends most of its time in the medium height trees and shrubs. Feeds mainly on insects and be...

18,5cm Like other flycatcher from the same genus, the Short-crested Flycatcher is yellow bellow, has a grayish throat and mostly brown upperparts. It can be told apart from the other species by the short crest and the absence of white spots around the eyes. Like other species of flycatcher it spends most of the time perched in forest edges. Feeds mainly on flying insects that it seizes in short flights, returning to the same perch. It also catches insects among the leaves and berries. Its vocalization reminds that of the White Woodpecker ( Melanerpes candidus ). The nest is build lining a small tree hole, where two buffy eggs are laid.

13,5cm The most distinguishing features of this species are the yellowish-orange head and the grayish-green body. This shades of color may vary depending on the subspecies, given that this bird is distributed thoughout the tropical region South to the Amazon river and East to the Andes. There is also a curiously isolated population in the Orinoco river basin. It lives in secondary forest, forest edges and even in cities with plenty of trees. Spends most of its time in the canopy, rarely coming to the ground. This bird moves in a very typical way, climbing the branches in a fast zig-zag, up to the tip and then letting itself fall onto the base of the next branch. It feeds mainly on s...

60 cm. The tail is very long. The general color is reddish brown. The tail feathers are pale in their tips and in the inferior side. The head has a lighter coloration. The chest is gray. The young individuals have shorter tails. Distribution: From Mexico to Argentina. Habitat: Lives in the canopy of secondary forests, cerrado and urban areas with plenty of trees. Diet: Feeds on grasshoppers, bugs, caterpillars, spiders, etc. Also feeds on small vertebrates as treefrogs. Reproduction: In the breeding season the male sings restlessly 96 times a minute. Before mating gives the female a caterpillar. The nest looks like a frying pan made of loosely crossed branches and is placed in a tall...

15 cm. The male is dark grey with the top of the head black. There are white spots in the tip of the tail’s feathers and in the wings, in a pattern that is similar to other antshrikes. The female is brown. Distribution: From Peru and Bolivia to Uruguay. Absent in most of the Amazon. Habitat: Mostly in Forest borders, gallery and secondary forests. Diet: Arthropods. Beats the wings to shake the foliage, catching the insects that are scared. Reproduction: The male offers the female some food before mating. The couple builds a nest with stems and moss. The female lays three white eggs with red dots. Generally the male incubates during the day and the female in the night. The paren...

16cm. Identification: The male is practically unmistakably recognized for the fully barred body and a black crest in the head. The female is ferruginous and has a crest and is barred in the head. It is currently the only antshrike which lives in really urban and disturbed areas. It is worth reminding that this bird has only recently conquered the urban environment. In the early 80s the first records of this antshrike in large cities were so unexpected that they yielded notes in scientific papers. Like other antshrikes it lives in couples, leaping and flying from branch to branch, usually through the short trees’ canopy in search for the small arthropods it feeds on. In the breeding seas...

White-spotted Woodpecker 18cm. Identification: it is a small woodpecker with drab colors. The body is brown, heavily spotted and barred in darker shades of brown and with some white spots below. The male has reddish regions in the head. Very little is known about this woodpecker, probably due to its inconspicuous colors and behavior. It lives in areas with plenty of trees as parks, woods and secondary forests. This woodpecker occurs mainly in the medium and higher forest levels, rarely coming to the ground. Like other woodpeckers it feeds on insects it collects from tree trunks and also on berries.

Nome popular: corujeiro.

Árvore até 14m; extremidade dos ramos vilosa, estriada, quadrangular, espessa; folha simples, oposta, estípula livre, triangular, bainha persistente, com pelo menos 7cm compr., pecíolo quadrangular, 7 X 0,5cm, tomentoso, lâmina elíptica a elíptico-oval, ápice acuminado, base atenuada, 49-63 X 22-34cm, margem inteira, levemente irregular, ciliada, sub-cartácea, 19 pares de nervuras secundárias, paralelas, conspícuas, terciária formando retículo conspícuo na face abaxial, face adaxial tomentulosa, abaxial denso-tomentulosa, tricomas adensados nas nervuras, quando jovem tomentosa.

Distribuição:<...