TEXT 2. BACTERIAL FLORA

1. Read and translate the following text from English into Russian using the wordlist.

The outer surface of the skin of the body always contains microorganisms. The same applies to the alimentary tract and respiratory passages of man and animals. The skin, intestinal contents, and the respiratory passages contain a normal bacterial flora. Occasionally some species penetrate the broken skin and intestinal wall, resulting in the establishment of a disease process. Usually the organisms are destroyed by the defense mechanisms of the host.

The great majority of the bacteria are not only harmless but absolutely necessary for the existence of living things. They are necessary for the disposal of humus and animal carcasses. The remains of plant crops, plant stubble, leaves, etc., are converted into soluble compounds by the soil organisms and made available to the new plants.

The souring of milk is the result of a bacterial action. This is the first step in the preparation of butter and cheese. The ripening of cheese is brought about by the action of bacteria and molds, which are responsible for the odours and flavours imparted to cheeses.

These are only a few examples of the part played by the associated activities of organism in nature.

Wordlist

alimentary tract пищеварительный тракт

to penetrate проникать внутрь, проходить сквозь

establishment распространение (болезни)

disposal разложение, удаление, распад

carcass туша, труп

stubble стерня, жниво

soluble растворимый

souring of milk скисание молока

mold плесень, плесневой грибок

odour запах

to impart придавать

2. Choose 10 terms or expressions. Learn them by heart.

3. Make a summary of the text.

Date: 2014-12-21; view: 1034