01/22/2012

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Luke Cage The structure of the cells can be found on the example of a plant cell, examined under a microscope preparation peel of onion scales. The sequence of preparation of the drug is shown in Fig. Source Material Structure cells in the sample preparation Preparation of onion scales peel onions. The structure of the cells of onion. At the micro specimen seen elongated cells, closely fitted to each other 6. Each cell has a thick transparent shell with a thin areas - pores that can be discerned only under high magnification. The composition of membranes of plant cells is a special substance - cellulose, which gives them strength. Inside is a colorless viscous substance - Cytoplasm (from the Greek words "kitos" - a vessel and "plasma" - education). With strong heating and freezing it is destroyed, and then the cell dies. The cytoplasm is a small dense core, which can be distinguished nucleolus. Using an electron microscope revealed that the cell nucleus has a very complicated structure. Almost all cells, especially in older, well marked cavity - the vacuole (from the Latin word "vakuus" - empty). They filled with cell sap - water with dissolved sugar in it and other organic and inorganic substances. By cutting the ripe fruit, or another part of the succulent plant, we corrupt the cells and their vacuoles follows from the juice. In the cell sap may contain coloring agents (pigments), giving the blue, violet, raspberry colored petals and other parts of plants, and autumn leaves. Preparing and viewing of the preparation of skin scales onion under a microscope 1. Consider the figure 5, the sequence of the drug preparation peel of onion scales. 2. Prepare a glass slide, carefully wiping his gauze. 3. Pipette, apply 1-2 drops of water on a glass slide. 4. With...
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Federal Waste Catalogue Annually, the structural units of track facilities located within the boundaries of the road, when the various kinds of repair paths formed about 1 million of used wooden sleepers impregnated with antiseptic means. Coal oil is the most toxic of all septic tanks, as 70 percent composed of aromatic hydrocarbons. According to the Federal Waste Catalogue, soaked them sleepers are third class of danger. Construction of railroad ties from the end-sleepers built cabins, barns and even bridges over small streams. However, for these purposes, you can send sleepers under 7 years old, that is, those which are impregnated with safe preservatives, and no toxic creosote. They were treated sleepers a few years ago. The problem of disposal of railway wooden sleepers, acute for the transportation industry. Refine: wooden sleepers price, total volume. Sale of sleepers from the manufacturer and with the Russian reserves. Disposal Incineration of wooden sleepers - the most well-known method of disposal of wooden sleepers. Since all the sleepers are impregnated with a special substance - creosote, this method is a negative point and causes the release of large quantities of toxic substances such as acetone, butanol, phenol, phenanthrene, which are released into the environment. This kind of material help formation of cancer. Building material - used railroad ties as the building (secondary use) of the material. A similar method is not environmental, is harmful to health because of the sharp separation, unpleasant odor and toxicity, but for the same reason, the ties do not rot, does not razlogayutsya. Warning: impregnated wooden sleepers (crossties treatment - it is harmful for the body, impregnation with creosote - the harmful chemical compound different matter) should not be used in the construction of buildings, houses, cottages ... gasification - extreme case of dispersion (conversion of fuel into the flow of...

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