News tagged with cells

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

New theory turns cancer on its head

A new theory of how cancer works could lead to the next generation of treatments of the disease. The theory suggests that cancer forms when recently evolved genes are damaged, and cells have to revert to ...

Jul 14, 2014
popularity 4.8 / 5 (18) | comments 1

How does the cerebellum work?

(Medical Xpress)—Nothing says "don't mess with me" like a deeply-fissured cortex. Even the sharpest jaws and claws in the animal kingdom are worthless without some serious thought muscle under the hood. ...

Jul 17, 2014
popularity 4.1 / 5 (16) | comments 15 report

Key to aging immune system is discovered

There's a good reason people over 60 are not donor candidates for bone marrow transplantation. The immune system ages and weakens with time, making the elderly prone to life-threatening infection and other ...

23 hours ago
popularity 4.8 / 5 (12) | comments 0

Scientists find new clues to brain's wiring

New research provides an intriguing glimpse into the processes that establish connections between nerve cells in the brain. These connections, or synapses, allow nerve cells to transmit and process information involved in ...

Jul 18, 2014
popularity 4.8 / 5 (10) | comments 1

US regulators fast-track novel leukemia therapy

US regulators on Monday put an experimental immunotherapy agent on the fast track to market approval, after 89 percent of leukemia patients in early trials saw their cancers disappear.

Jul 07, 2014
popularity 5 / 5 (9) | comments 1

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