Bacterium

(n.) A microscopic vegetable organism, belonging to the class Algae, usually in the form of a jointed rodlike filament, and found in putrefying organic infusions. Bacteria are destitute of chlorophyll, and are the smallest of microscopic organisms. They are very widely diffused in nature, and multiply with marvelous rapidity, both by fission and by spores. Certain species are active agents in fermentation, while others appear to be the cause of certain infectious diseases. See Bacillus.

杰拉尔德编辑

• The bacteria are further divided into species, and names are given them to distinguish the different forms. Edward W. Byrn. 十九世纪发明进展.
• On the other hand, bacteria are the cause of many of the most dangerous diseases, such as typhoid fever, tuberculosis, influenza, and la grippe. 伯莎M.克拉克. 科学通论.
• With the simple microscope Leeuwenhoek before 1673 had studied the structure of minute animal organisms and ten years later had even obtained sight of bacteria. 李贝. 西洋科学史.
• They are known as micro-organisms, of which the bacteria are the most important. Edward W. Byrn. 十九世纪发明进展.
• The bacteria-made compounds dissolve in the soil water and are absorbed into the plant by the roots. 伯莎M.克拉克. 科学通论.
• In a sick room sunlight is especially valuable, because it not only kills bacteria, but keeps the air dry, and new bacteria cannot get a start in a dry atmosphere. 伯莎M.克拉克. 科学通论.
• This is because the roots of these plants often have on them tiny swellings, or tubercles, in which millions of certain bacteria live and multiply. 伯莎M.克拉克. 科学通论.
• Dirt and dust exposed to the sunlight lose their living bacteria, while in damp cellars and dark corners the bacteria thrive, increasing steadily in number. 伯莎M.克拉克. 科学通论.
• Cuts and wounds allow easy access to the body; a small cut has been known to cause death because of the bacteria which found their way into the open wound and produced disease. 伯莎M.克拉克. 科学通论.
• The delicate flavor of butter and the sharp but pleasing taste of cheese are produced by bacteria. 伯莎M.克拉克. 科学通论.
• But the chemicals which destroy bacteria frequently injure the consumer as well. 伯莎M.克拉克. 科学通论.
• In the household, bacteria are a fruitful source of trouble, but some of them are distinctly friends. 伯莎M.克拉克. 科学通论.
• For the study of bacteria they are propagated artificially in a test tube--_i. Edward W. Byrn. 十九世纪发明进展.
• These bacteria have the remarkable power of taking free nitrogen from the air in the soil and of combining it with other substances to form compounds which plants can use. 伯莎M.克拉克. 科学通论.
• Roots of soy bean having tubercle-bearing bacteria. 伯莎M.克拉克. 科学通论.

整理:朱莉安娜