Ielts Essay Sample Band 6 To Write A Cv In

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Climatic conditions of a zone of an arrangement of economy it is favorable for cultivation of the main crops; grain, sugar beet, potatoes, corn on a silo. The territory of economy is included into a forest-steppe zone. It is located on a watershed of the river of Proni and Nerd, therefore all territory of a rassechen numerous ravines and beams with a bias in all directions. The most part of the territory is characterized by prevalence of wide platoobrazny massifs with gentle slopes to valleys of the rivers, ravines and beams.

The inundated vegetation more accumulates caesium – 137, than sukhodolny. So at pollution of the floodplain 2,4 Ki/ in a grass were revealed Ki/kg of dry weight, and on sukhodolny at pollution 3,8 Ki/

The mechanism of digestion of radionuclides roots of plants is similar to absorption of the main nutrients – macro and microcells. A certain similarity is observed in absorption by plants and movement of strontium on them – 90 and caesium – 137 and their chemical analogs – calcium and potassium therefore the content of these radionuclides in biological objects sometimes express in relation to their chemical analogs, in so-called strontic and caesium units.

The soil cover of economy differs in diversity, quite big variety of versions. Chernozems vyshchelochnny, opodzolenny and separate sites the dark gray, gray forest are generally widespread

Pollution of system "the soil – plants – water" various chemicals, and mainly solid, liquid and gaseous waste of the industry, fuel products, etc. leads to change of a chemical composition of soils.

the biochemical signs defining the sorption indicator of fabrics revealed at their vital coloring can distribute by radio of sensitivity in the following decreasing sequence: big hemispheres and trunks of a brain, cerebellum, hypophysis, adrenal glands, seed plants,, lymph nodes, spinal cord, digestive tract, liver, spleen, lungs, kidneys, heart, muscles, skin and bone tissue.

The main of them are: destruction of the substances stimulating a mitosis; violation of permeability of cellular membranes with change of a form of a cage; accumulation of the substances which are slowing down cell division, for example, the excess contents in a cell of adenosine triphosphoric acid (ATP) as a result of enzyme violation – an adenozintrifosfataz; violation of synthesis of nucleinic acids; damages of chromosomes in the form of chromosomal reorganizations or chromosomal aberrations.

In these cases of receipt to the soil caesium – 137 is easily available to assimilation by plants. Further radionuclide can join in various reactions in the soil and its mobility decreases, increases fixing durability, radionuclide "grows old", and such "aging" represents a complex of soil kristallokhimichesky reactions with possible entry of radionuclide into crystal structure of secondary clay minerals.

It is noted that kaltsiyelyubivy plants usually absorb more strontium – 90, than plants poor in calcium. Most of all accumulate strontium – 90 bean cultures, it is less root crops and tuber crops, and it is even less cereals.

From sour soils radionuclides come to plants in much large numbers, than from soils subacidic, neutral and poorly alkaline. In sour soils mobility of strontium – 90 increases and caesium – 137 durability their plants decreases. Entering of carbonates of calcium and potassium or sodium into the sour cespitose and podsolic soil in the quantities equivalent to gidrolichesky acidity, reduces the amount of accumulation of long-living radionuclides of strontium and caesium in a crop.