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What structure enables bacteria to germinate after exposure to harsh conditions?
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What is the effect of longer exposure to ultraviolet light?
Prolonged exposure to ultraviolet light can have a number of effects on bacteria. For example, the exposure can lead to mutations in the bacteria's DNA or complete eradication of the bacteria, giving UV light antibacterial properties.
Which condition can cause widespread exposure of pavement?
Asphalt fumes irritating the respiratory tract are common conditions seen from widespread pavement exposure. Pavement fume exposure may even lead to lung cancer.
How do nerves get damaged?
Nerves can get damaged due to physical injuries that directly impact the nerves, due to infection by pathogens such as meningococcal bacteria or poliovirus, or due to exposure to poisons such as mercury.
What ends dormancy of a seed?
Dormancy is poorly understood in terms of what causes it although it is likely that very many mechanisms exist, most of them probably chemical in nature. Some responsible compounds have been isolated, but in most cases, how they work is not understood. Breaking of dormancy is reasonably well understood in empirical terms. Things that are known to break dormancy include, particular cycles of wet and dry and/or heat and cold, exposure to one period above or below a certain temperature for a certain minimum period, exposure to certain chemicals (such as smoke), abrasion of the seed-coat (perhaps by being eaten but not digested). The list is considerable and particular seeds may require any one or more triggers to germinate.
Why does sunlight and air kill bacteria?
Strong sunlight has been shown in a small number of studies to have a moderate effect on the kinds of bacteria you are likely to encounter in everyday life. Ultraviolet radiation is a component of solar light; large organisms have adapted defenses against it through dermatological evolution (thick skin that protects them from damage), but bacteria, though they have cell membranes, are not well-equipped to survive it. UV (like other forms of ionizing radiation), can damage cells and the DNA that they store, but biological repair mechanisms are there to counteract this kind of damage. In one study strong sunlight was found to have a moderate effect on replication of some bacteria, but that other forms are strongly resistant to it. It's also a matter of record that strong doses of short-wavelength UV can kill microorganisms, but sunlight's unlikely to have the kind that would be helpful in this context. Therefore, though exposure to sunlight might decrease the number/slow breeding of bacteria on surfaces/objects, it is no substitute for a strong, scientifically-tested bactericidal agent (like an alcohol rub, antibacterial cleaning sprays), or in a human context, firm vigorous hand-washing.
Some bacteria can survive extended periods of very harsh conditions by forming?
endospores. Endospores are dormant structures with thick protective layers that allow bacteria to withstand extreme temperatures, desiccation, and exposure to chemicals and radiation. When conditions become more favorable, endospores can germinate and the bacteria can resume their normal metabolic activities.
What occur after exposure to a certain bacteria and can help fight off the same bacteria in the future?
ccur (s) after exposure to a certain bacteria and can help fight off the same bacteria in the future
What is the effect of longer exposure to ultraviolet light?
Prolonged exposure to ultraviolet light can have a number of effects on bacteria. For example, the exposure can lead to mutations in the bacteria's DNA or complete eradication of the bacteria, giving UV light antibacterial properties.
What are the conditions that keep antiseptic resistant bacteria populations low?
Extremely high temperatures can keep antibiotic resistant bacteria low. This is what is used in Pasteurization. Environments where UV light is present are also ones where bacteria can be kept low, as the bacteria cannot survive exposure to this type of light.
How do you catch conjunctivitis?
From exposure to a person who already has trachoma or from exposure to clamydia trachomatis bacteria.
Why is it important to know which species of bacteria are susceptible to which antibiotics?
If bacteria are susceptible to antibiotics, exposure to antibiotics will lead to the death or weakening of the bacteria.
What type of line should be stretched for exposure protection on a fully involved structure fire?
What type of line should be stretched for exposure protection on a fully involved structure fire?
Exposure of rocks at earth's surface to water and atmospheric conditions is most likely to cause?
Exposure of rocks at the earth's surface to water and atmospheric conditions is most likely to cause erosion. The Grand Canyon is a good example of this type of exposure.
Does exposure to extreme cold weather conditions lead to meningitis?
no
Increased resistance in bacteria after repeated exposure to antibiotics is due to?
Natural selection
What was the independent variable in Pasteur's experiment?
The independent variable was bacteria exposure.
Under what conditions is vitamin D prodced by the body and where?
exposure to sunlight
