News tagged with organisms

Related topics: cells , protein , bacteria , genes , mutations

A recipe for long-lasting livers

People waiting for organ transplants may soon have higher hopes of getting the help that they need in time. Researchers at the RIKEN Center for Developmental Biology have developed a new technique that extends ...

Apr 22, 2015
popularity 42 comments 0

Reducing global tobacco use

Although global efforts to cut tobacco use have had some success, more can be done to reduce the number of deaths from smoking, according to a commentary published in CMAJ (Canadian Medical Association Journal). ...

Apr 20, 2015
popularity 20 comments 0

One child in five still not vaccinated: WHO

One-fifth of the world's children are still not receiving routine life-saving vaccinations and efforts to ensure global immunisation coverage remain "far off track," the World Health Organization said Wednesday.

Apr 22, 2015
popularity 10 comments 0

Organism

In biology, an organism is any living system (such as animal, plant, fungus, or micro-organism). In at least some form, all organisms are capable of response to stimuli, reproduction, growth and development, and maintenance of homeostasis as a stable whole. An organism may either be unicellular (single-celled) or be composed of, as in humans, many billions of cells grouped into specialized tissues and organs. The term multicellular (many-celled) describes any organism made up of more than one cell.

The terms "organism" (Greek ὀργανισμός - organismos, from Ancient Greek ὄργανον - organon "organ, instrument, tool") first appeared in the English language in 1701 and took on its current definition by 1834 (Oxford English Dictionary).

Scientific classification in biology considers organisms synonymous with life on Earth. Based on cell type, organisms may be divided into the prokaryotic and eukaryotic groups. The prokaryotes represent two separate domains, the Bacteria and Archaea. Eukaryotic organisms, with a membrane-bounded cell nucleus, also contain organelles, namely mitochondria and (in plants) plastids, generally considered to be derived from endosymbiotic bacteria. Fungi, animals and plants are examples of species that are eukaryotes.

More recently a clade, Neomura, has been proposed, which groups together the Archaea and Eukarya. Neomura is thought to have evolved from Bacteria, more specifically from Actinobacteria.

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