News tagged with metabolism

Related topics: genes · protein · cells · amino acids · diabetes

Exploring vaccine safety

When a vaccine is given, there's always a risk of side-effects since it induces an immune response. The BIO-department is involved in the largest vaccine project ever, with the aim to develop new tools for monitoring vaccine ...

Feb 01, 2017
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High altitude living decreases the risk of heart disease

Could something as simple as the geographic area in which you live contribute to your risk of developing heart disease and diabetes, or suffering a stroke? A new study, published in the open-access journal Frontiers in Physiology, ...

Jan 30, 2017
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A way out of the junk-food eating cycle

People are easily pulled into binge culture's quick-fix obsession with junk-food. But, according to a study published in Frontiers in Behavioral Neuroscience, they might just as easily be able to pull themselves out of it.

Jan 27, 2017
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Metabolism

Metabolism is the set of chemical reactions that occur in living organisms to maintain life. These processes allow organisms to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is usually divided into two categories. Catabolism breaks down organic matter, for example to harvest energy in cellular respiration. Anabolism, on the other hand, uses energy to construct components of cells such as proteins and nucleic acids.

The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed into another by a sequence of enzymes. Enzymes are crucial to metabolism because they allow organisms to drive desirable but thermodynamically unfavorable reactions by coupling them to favorable ones, and because they act as catalysts to allow these reactions to proceed quickly and efficiently. Enzymes also allow the regulation of metabolic pathways in response to changes in the cell's environment or signals from other cells.

The metabolism of an organism determines which substances it will find nutritious and which it will find poisonous. For example, some prokaryotes use hydrogen sulfide as a nutrient, yet this gas is poisonous to animals. The speed of metabolism, the metabolic rate, also influences how much food an organism will require.

A striking feature of metabolism is the similarity of the basic metabolic pathways between even vastly different species. For example, the set of carboxylic acids that are best known as the intermediates in the citric acid cycle are present in all organisms, being found in species as diverse as the unicellular bacteria Escherichia coli and huge multicellular organisms like elephants. These striking similarities in metabolism are most likely the result of the high efficiency of these pathways, and of their early appearance in evolutionary history.

This text uses material from Wikipedia, licensed under CC BY-SA

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