HIV & AIDS

A new way to study HIV's impact on the brain

Though many negative repercussions of human immunodeficiency virus infection can be mitigated with the use of antiretroviral therapy (ART), one area where medical advances haven't made as much progress is in the reduction ...

Genetics

Benefiting from the national gene vector biorepository

Gene therapy investigators can greatly benefit from the resources and services provided by the National Gene Vector Biorepository (NGVB), housed at the Indiana University School of Medicine. These include 93 unique reagents, ...

Immunology

How to boost immune response to vaccines in older people

Research just published by the Linterman lab shows that the immune system of older mice can be given a helping hand by applying immunology expertise and some genital wart treatment (don't try this at home just yet)!

page 1 from 100

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