Today, patients who receive an organ transplant need repeated surgical biopsies to test for acute cellular rejection (ACR) throughout their lifetimes. But a blood test for ACR could be on the horizon following the discovery ...
23 hours ago
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The World Health Organization voiced alarm Thursday at the growing spread of H5N1 bird flu to new species, including humans, who face an "extraordinarily high" mortality rate.
22 hours ago
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The World Health Organization has approved a version of a widely used cholera vaccine that could help address a surge in cases that has depleted the global vaccine stockpile and left poorer countries scrambling to contain ...
20 hours ago
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The World Health Organization on Thursday announced a new, catch-all terminology for pathogens that transmit through the air, erasing a distinction that caused dangerous confusion during the COVID pandemic.
22 hours ago
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In rural Kenya, 64-year-old John Kamau's world of silence is about to change. For decades, isolated by hearing loss from the community's vibrant life and his grandchildren's conversations, he sees hope when a community health ...
20 hours ago
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By analyzing electronic health records, researchers at the University of California San Diego School of Medicine have identified hundreds of new genes associated with tobacco use disorder. They also identified hundreds of ...
Apr 17, 2024
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Radio ads with an emotional appeal—featuring personal stories of either a happy organ transplant recipient or a sad patient languishing on the waiting list—increase non-donor listeners' support for organ donation and ...
Apr 17, 2024
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Over 100,000 people in the U.S. are waiting for an organ transplant. Unfortunately, many may never get the call saying that a suitable donor organ—and a second chance at life—has been found. It's estimated that more than ...
Apr 17, 2024
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Significantly reducing trans fat levels in the Nigerian food supply could prevent approximately 10,000 heart disease deaths and save $90 million US (12 billion Naira, ₦) in health care costs over a decade. The new findings ...
Apr 17, 2024
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A new kind of mosquito net delivered across sub-Saharan Africa averted an estimated 13 million malaria cases and nearly 25,000 deaths over three years, the project's backers said Wednesday.
Apr 17, 2024
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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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