Предмет: История, автор: sofa555pauk

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Автор ответа: smamarina
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Цветное стекло. Так как он его изобрел

Автор ответа: sashulya1101
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Предмет: Английский язык, автор: milani94
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ЗАРАНЕЕ СПАСИБО :))
 
Body provides a home for a great number of the
smallest organisms – microorganisms. Most of them are harmless but some take
part in dental diseases. There are three different groups of microorganisms:
fungi, bacteria and viruses. They may be of different kinds, both harmless and
more or less dangerous.

Bacteria are subdivided into groups according
to their shape bacilli, cocci, spirochetes, spores.


Bacilli are
rod – shaped bacteria. For example, lactobacillus is found in decayed teeth.


Cocci are
round bacteria.


Streptococci
are berry – shaped bacteria which grow in twisted chains. They are associated
with different


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diseases. Hemolytic
streptococci (called hemolytic
because bacteria cause hemolysis) are responsible for such conditions as
“strep” throat, tonsillitis.


Streptococci viridians (viridians means “green” and
these bacteria produce a green color on the growth medium) are less virulent
(poisonous) than the hemolytic form and cause infections in teeth.


 Staphylococci are bacteria which grow in small clusters like grapes. One strain
of staphylococcus may be found in gumboils.


There are also spiral bacteria (spirochetes) found in acute necrotizing ulcerative
gingivitis.


Some bacteria can exist in the form
of spores. Spores can survive
extremes of temperature and live for years until conditions become more favorable
again.
They are highly resistant to destruction.
Предмет: Математика, автор: lesya1310