News tagged with cells

Related topics: protein · cancer cells · cancer · stem cells · immune system

Athletes' stem cell use gaining wider appeal

When ailing hockey legend Gordie Howe received stem cells grown by the San Diego company Stemedica, the story attracted international attention. But while Howe's status made his case seem exceptional, this once-exotic therapy ...

May 27, 2016
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Triptorelin doesn't prevent chemo-induced ovarian failure

(HealthDay)—Triptorelin plus norethisterone (GnRHa) does not prevent chemotherapy-induced premature ovarian failure (POF) in young patients with lymphoma, according to a study published online May 23 in the Journal of Clinical ...

May 27, 2016
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How Zika infects the placenta

Zika virus can infect and replicate in immune cells from the placenta, without killing them, scientists have discovered. The finding may explain how the virus can pass through the placenta of a pregnant woman, on its way ...

May 27, 2016
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Guarding the gatekeepers

Information flow in cells relies on calcium as a key agent in several signalling pathways. Calcium dependent signalling is crucial in nearly every aspect of life - muscle movement, immune reactions, nerve function, light ...

May 27, 2016
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New model of T cell activation

T cell receptors are an important part of the human immune system. They are able to switch their conformation from an inactive to an active state spontaneously without any antigens present. Cholesterol binds and stabilizes ...

May 27, 2016
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Cell (biology)

The cell is the structural and functional unit of all known living organisms. It is the smallest unit of an organism that is classified as living, and is often called the building block of life. Some organisms, such as most bacteria, are unicellular (consist of a single cell). Other organisms, such as humans, are multicellular. (Humans have an estimated 100 trillion or 1014 cells; a typical cell size is 10 µm; a typical cell mass is 1 nanogram.) The largest known cell is an unfertilized ostrich egg cell.

In 1835 before the final cell theory was developed, a Czech Jan Evangelista Purkyně observed small "granules" while looking at the plant tissue through a microscope. The cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells. All cells come from preexisting cells. Vital functions of an organism occur within cells, and all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.

The word cell comes from the Latin cellula, meaning, a small room. The descriptive name for the smallest living biological structure was chosen by Robert Hooke in a book he published in 1665 when he compared the cork cells he saw through his microscope to the small rooms monks lived in.

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

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