The olfactory epithelium located in the nasal cavities of most vertebrates, for example, is endowed with cells specialized in the capture of odors of various types, even at very small concentrations. There are two types of materials in the environment: those that give off particles (such as roses, perfumes, warm bread being baked in the oven) and others that do not (such as steel and glass).
The activity of an ecosystem can be assessed by gross primary productivity (PPB), which is the total organic matter produced in grams over a period of time in a certain environmental area: PPB = mass of organic matter produced / time / area Discounting this Total amount of organic matter consumed by the community during this period, in respiration (R), we have the net primary productivity (PPL), which can be represented by the equation: PPL = PPB - RA The productivity of an ecosystem depends on several factors, among which the most important are light, water, carbon dioxide and nutrient availability.
The divisions that occur during segmentation are called cleavages, and the cells that form are called blastomers. In the Animal Kingdom, the difference in the quantity and distribution of calf in the egg determines differences in segmentation, the lower the rate of division. Because of this, we can consider two basic types of segmentation: holoblastic or total that occurs in the whole zygote; meroblastic or partial, which occurs only in part of the egg.
This means that you can be "full" even on an empty stomach. Just that your bacteria are already satisfied. A new study in France shows that intestinal bacteria Escherichia coli (E.coli) produce appetite-suppressing proteins 20 minutes after meals. They release proteins from satiety after they have enough nutrients for themselves.
Brazil has a great diversity of ecosystems. Almost all of its territory is situated in the tropical zone. Therefore, our country receives a great deal of heat all year round, which favors this great diversity. See the map below for examples of the main ecosystems found in Brazil.
Internal lining of the small intestine is a good example of epithelium that specializes in absorbing nutrients and allowing them to pass from the intestinal cavity to the blood. The high absorption capacity of the intestinal epithelium is due to the fact that its cells have, in the membrane, the free edge (ie, the edge facing the intestinal cavity), many thin, elongated projections that resemble glove fingers called microvilli. .