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Contact in Biological Definition

Culture

... and innovation , but it could also result from contact between two cultures. Under peaceful conditions, contact between two cultures can lead to people ... in terms of a broader history involving contact and relations with other cultures. In addition ...

Foot and mouth disease

... passed on to susceptible animals through direct contact with infected animals or with contaminated pens ... genetic material). When such a virus comes in contact with a host cell, it binds to a receptor site and ... be infected with foot-and-mouth disease through contact with infected animals, but this is extremely ....

Anaphase

... extend from the spindle poles to the centromeres . The point of contact is a protein complex called the kinetochore, and these fibres are sometimes referred to as spindle microtubules . Other spindle fibres do not contact the chromosomes but either connect directly with spindle fibres from the ...

Antibody

... and saliva . This immunoglobulin helps to fight against pathogens that contact the body surface, ingested, or inhaled. It does not activate complement ... antibody". This means that it is found in the serum without an evident contact with antybody. IgD IgD makes up about 1% in the plasma membranes in ...

Blood

... blood is blue and that blood only becomes red when it comes into contact with oxygen. Blood is never blue , but veins appear blue because light ... of infection. AIDS , the virus of which, HIV , is transmitted through contact between blood, semen , or the bodily secretions of an infected person. ...

Cancer

... division rate altered ability to differentiate no ability for contact inhibition ability to invade neighbouring tissues ability to ... morphology . Building of cellular clusters ( foci ). Loss of contact inhibition . Low or no need for growth factors . Items 2-4 (above) ...

Ebola

... hemorrhagic fever Among humans, the virus is transmitted by direct contact with infected body fluids such as blood. The cause of the index case is ... 90 mm Hg or a rapid weak pulse). Finally, that patient may have had contact with someone in the last three weeks that had an unexplained illness with ...

Acrosome

... hyaluronidase and acrosin ) needed to penetrate the zona pellucida covering the ovum . Acrosome reaction When the sperm comes in contact with ZP3 in the zona pellucida, this reaction takes place, during which actin polymerizes to form the acrosomal process ; also, the acrosomal ...

Acrosome

... hyaluronidase and acrosin ) needed to penetrate the zona pellucida covering the ovum . Acrosome reaction When the sperm comes in contact with ZP3 in the zona pellucida, this reaction takes place, during which actin polymerizes to form the acrosomal process ; also, the acrosomal ...

Antigen

... form is changed. Allergen - An allergen is any substance that causes an allergic reaction . It can be eaten, inhaled, injected or comes into contact with skin. Antigens are presented by a cell to its environment via a histocompatibility molecule . Depending on the antigen presented and the ...

Bone

... General Features Process a relatively large projection or prominent bump Articulation the region where adjacent bones contact each other - a joint Articular process a projection that contacts an adjacent bone Eminence a relatively small projection or ...

Chromatography

... to a strip of chromatography paper about one centimetre from the base. This sample is adsorbed onto the paper. This means that the sample will contact the paper and may form interactions with it. Any substance that will react with (and thus bond to) the paper cannot be measured using this technique. ...

Dialysis

... is done by altering the plumbing to push saline through the filter, and carefully checked with a type of litmus test . The pump does not directly contact the blood or fluid in the plumbing - it works by applying pressure to the tubing, then moving that pressure point around. Think of a disk with a ...

Diffusion

... flowing past a solid surface, momentum diffuses across the boundary layer near the surface. The gradient in this case is between the liquid in contact with the surface (which isn't moving at all and has zero momentum) and the liquid far away from the wall, which has momentum proportional to the ...

Electrophysiology

... by analyzing the action potentials produced by a cell. The most common electrophysiological recording techniques establish electrical contact with the inside of a cell or tissue with a "glass electrode." Such an electrode is fashioned by the experimenter from a fine capillar glass tube, ...

Eye

... to the soul ." Adaptation Accommodation Binocular vision Crystallin Evil eye Evolution of the Eye Eye color Eye contact Eye tracking Eyeglass prescription Macropsia Micropsia Nictating membrane Ocular tremor Optometry Ophthalmology ...

Fehling's solution

... grams Rochelle salt (potassium sodium tartrate tetrahydrate) and 100 grams sodium hydroxide The cupric ion is complexed with the tartrate ion. contact with an aldehyde group reduces it to a cuprous ion, which then precipitates as red Cu 2 O ( copper(I) oxide ). Fehling's solution is nowadays often ...

Genetic recombination

... Problems of crossover Crossover recombination can occur between any two double helices of DNA which are very close in sequence and come into contact with one another. Thus, crossover may occur between Alu repeats on the same chromatid, or between similar sequences on two completely different ...

Immune system

... lectin pathways, are involved in complement activation. The first recognizes antigen-antibody complexes, the second spontaneously activates on contact with pathogenic cell surfaces, the third recognizes mannose sugars, which tend to appear only on pathogenic cell surfaces. A cascade of protein ...

Lipid

... In an aqueous milieu, the heads of lipids tend to face the polar, aqueous environment, while the hydrophobic tails tend to minimize their contact with water. The nonpolar tails of lipids ( U ) tend to cluster together, forming a lipid bilayer (1) or a micelle (2). The polar heads ( P ) face ...

Nutrition

... remember that Wikipedia is offered for informational use only. The information is in most cases not reviewed by professionals. You are advised to contact your doctor for health-related decisions. ...

Outbreak

... Other emerging viruses include Severe Acute Respiratory Syndrome ( SARS ), henipaviruses and Ebola which have been contained through aggressive contact tracing and isolation of patients and suspected carriers of the disease. Hoof and mouth disease (UK foot and mouth disease ) is a major animal ...

Semen

... semen components shown to spur an immunosuppressive effect are seminal plasma and seminal lymphocytes. Note that any kind of sexual or other skin contact with the semen of a person infected with HIV should be avoided, even by persons already infected with the virus, as this may cause harmful ...

Signal transduction

... , used for communication with the translational apparatus. The zinc fingers in the DNA-binding domain stabilize DNA binding by holding contact to the phosphate backbone of the DNA. The DNA sequences that match the receptor are usually hexameric repeats, either normal, inverted or everted. ...

Speciation

... the zones of two species abut but do not overlap. There is only partial separation afforded by geography, so individuals of each species may come in contact or cross the barrier from time to time. Which mechanisms of speciation have actually taken place over the course of evolution is a subject of ...

Synapse

... synapses where neurotransmitter is released are called the active zones . At active zones the membranes of the two adjacent cells are held in close contact by cell adhesion proteins. Note: There also exists a less elaborate form of junction called an electrical synapse . Signalling across ...

Virus

... a host cell, it is called a virion — a package of viral genetic material. Virions can be passed from host to host either through direct contact or through a vector , or carrier. Inside the organism, the virus can enter a cell in various ways. Bacteriophages —bacterial ...
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