Cell Membrane Wikipedia

Cell membrane - Wikipedia.

The cell membrane (also known as the plasma membrane (PM) or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates and protects the interior of all cells from the outside environment (the extracellular space). The cell membrane consists of a lipid bilayer, made up of two layers of phospholipids with cholesterols ....


Proton-exchange membrane fuel cell - Wikipedia.

Proton-exchange membrane fuel cells (PEMFC), also known as polymer electrolyte membrane (PEM) fuel cells, are a type of fuel cell being developed mainly for transport applications, as well as for stationary fuel-cell applications and portable fuel-cell applications.Their distinguishing features include lower temperature/pressure ranges (50 to 100 ?C) and a special proton ....


History of cell membrane theory - Wikipedia.

Cell theory has its origins in seventeenth century microscopy observations, but it was nearly two hundred years before a complete cell membrane theory was developed to explain what separates cells from the outside world. By the 19th century it was accepted that some form of semi-permeable barrier must exist around a cell. Studies of the action of anesthetic molecules led to ....


Cell cycle - Wikipedia.

G 0 is a resting phase where the cell has left the cycle and has stopped dividing. The cell cycle starts with this phase. Non-proliferative (non-dividing) cells in multicellular eukaryotes generally enter the quiescent G 0 state from G 1 and may remain quiescent for long periods of time, possibly indefinitely (as is often the case for neurons).This is very common for cells that are ....


Cell - Wikipedia.

Locations. Monastic cell, a small room, hut, or cave in which a religious recluse lives, alternatively the small precursor of a monastery with only a few monks or nuns; Prison cell, a room used to hold people in prisons; Groups of people. Cell, a group of people in a cell group, a form of Christian church organization; Cell, a unit of a clandestine cell system, a penetration-resistant ....


Fluid mosaic model - Wikipedia.

The fluid mosaic model explains various observations regarding the structure of functional cell membranes.According to this biological model, there is a lipid bilayer (two molecules thick layer consisting primarily of amphipathic phospholipids) in which protein molecules are embedded. The phospholipid bilayer gives fluidity and elasticity to the membrane. ....


Muscle cell - Wikipedia.

The cell membrane of a cardiac muscle cell has several specialized regions, which may include the intercalated disc, and transverse tubules.The cell membrane is covered by a lamina coat which is approximately 50 nm wide. The laminar coat is separable into two layers; the lamina densa and lamina lucida.In between these two layers can be several different types of ions, ....


Brain cell - Wikipedia.

Brain cells make up the functional tissue of the brain.The rest of the brain tissue is structural or connective called the stroma which includes blood vessels.The two main types of cells in the brain are neurons, also known as nerve cells, and glial cells also known as neuroglia.. Neurons are the excitable cells of the brain that function by communicating with other neurons and ....


Depolarization - Wikipedia.

In biology, depolarization or hypopolarization is a change within a cell, during which the cell undergoes a shift in electric charge distribution, resulting in less negative charge inside the cell compared to the outside. Depolarization is essential to the function of many cells, communication between cells, and the overall physiology of an organism..


Autoimmunity - Wikipedia.

Autoimmunity is the system of immune responses of an organism against its own healthy cells, tissues and other body normal constituents. Any disease resulting from this type of immune response is termed an "autoimmune disease".Prominent examples include celiac disease, post-infectious IBS, diabetes mellitus type 1, Henloch Scholein Pupura (HSP) sarcoidosis, systemic ....


Cone cell - Wikipedia.

Cone cells are somewhat shorter than rods, but wider and tapered, and are much less numerous than rods in most parts of the retina, but greatly outnumber rods in the fovea.Structurally, cone cells have a cone-like shape at one end where a pigment filters incoming light, giving them their different response curves.They are typically 40-50 um long, and their diameter varies from 0.5 ....


Membrane technology - Wikipedia.

Membrane separation processes operate without heating and therefore use less energy than conventional thermal separation processes such as distillation, sublimation or crystallization.The separation process is purely physical and both fractions (permeate and retentate) can be used.Cold separation using membrane technology is widely used in the food technology, ....


Nasal mucosa - Wikipedia.

The mucous membrane is thickest, and most vascular, over the nasal conchae. It is also thick over the nasal septum where increased numbers of goblet cells produce a greater amount of nasal mucus. It is very thin in the meatuses on the floor of the nasal cavities, and in the various sinuses. It is one of the most commonly infected tissues in ....


Glia - Wikipedia.

Glia, also called glial cells (gliocytes) or neuroglia, are non-neuronal cells in the central nervous system (brain and spinal cord) and the peripheral nervous system that do not produce electrical impulses. They maintain homeostasis, form myelin in the peripheral nervous system, and provide support and protection for neurons. In the central nervous system, glial cells include ....


Secondary cell wall - Wikipedia.

The secondary cell wall is a structure found in many plant cells, located between the primary cell wall and the plasma membrane.The cell starts producing the secondary cell wall after the primary cell wall is complete and the cell has stopped expanding. Secondary cell walls provide additional protection to cells and rigidity and strength to the larger plant..


Human fertilization - Wikipedia.

Human fertilization is the union of a human egg and sperm, occurring in the ampulla of the fallopian tube. The result of this union leads to the production of a zygote cell, or fertilized egg, initiating prenatal development.Scientists discovered the dynamics of human fertilization in the nineteenth century.. The process of fertilization involves a sperm fusing with an ovum..


Microvillus - Wikipedia.

Structure. Microvilli are covered in plasma membrane, which encloses cytoplasm and microfilaments.Though these are cellular extensions, there are little or no cellular organelles present in the microvilli.. Each microvillus has a dense bundle of cross-linked actin filaments, which serves as its structural core. 20 to 30 tightly bundled actin filaments are cross-linked by ....


Double bond - Wikipedia.

In chemistry, a double bond is a covalent bond between two atoms involving four bonding electrons as opposed to two in a single bond.Double bonds occur most commonly between two carbon atoms, for example in alkenes.Many double bonds exist between two different elements: for example, in a carbonyl group between a carbon atom and an oxygen atom. Other common ....


Aminoglycoside - Wikipedia.

Aminoglycoside is a medicinal and bacteriologic category of traditional Gram-negative antibacterial medications that inhibit protein synthesis and contain as a portion of the molecule an amino-modified glycoside (). The term can also refer more generally to any organic molecule that contains amino sugar substructures. Aminoglycoside antibiotics display bactericidal ....