- Nitrogen-fixing bacteria, which convert atmospheric nitrogen to nitrates
- Nitrifying bacteria, which convert ammonia to nitrates/nitrites.
- Denitrifying bacteria, which convert nitrates to nitrogen gas
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The whole range of biochemical processes that occur within a living organism. Metabolism consists of anabolism (the buildup of substances) and catabolism (the breakdown of substances). The term metabolism is commonly used to refer specifically to the breakdown of food... (More)
The specificity of an enzyme denotes its ability to act selectively on one substance or a small number of chemically similar substances, the enzyme's substrates. Like antibody specificity, enzyme specificity depends on a close fit between substrate molecules and their... (More)
- Innate immunity: Everyone is born with innate (or natural) immunity, a type of general protection. For example, the skin acts as a barrier to block germs from entering the body. And the immune system recognizes when certain invaders are foreign... (More)
T lymphocytes are cells that are programmed to recognize, respond to and remember antigens. T lymphocytes (or T cells) contribute to the immune defenses in two major ways. Some direct and regulate the immune responses.
enzyme specificity depends on a close fit between substrate molecules and their binding sites on an enzyme.The apoenzyme is responsible for the enzyme's substrate specificity.
Diseases and conditions of the respiratory system fall into two categories: Infections, such as influenza, bacterial pneumonia and enterovirus respiratory virus, and chronic diseases, such as asthma and chronic obstructive pulmonary disease (COPD).
The act of setting in firmly. In embryology, implantation refers specifically to the attachment of the fertilized egg to the uterine lining, which occurs approximately 6 or 7 days after conception (fertilization)
White matter is tissue in the brain composed of nerve fibers. The fibers (called axons) connect nerve cells and are covered by myelin (a type of fat). The myelin is what gives white matter its white color. Myelin speeds up... (More)
Pi bonds are usually weaker than sigma bonds. Quantum mechanics says this is because the orbital paths are parallel so there is much less overlap between the p-orbitals. Pi bonds happen when two atomic orbitals are in contact through two... (More)