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Pure in Biological Definition

Hardy-Weinberg principle

... , with whom he played cricket . Hardy was a pure mathematician and held applied mathematics in ... and that in any given generation the number of pure dominants (AA), heterozygotes (Aa), and pure recessives (aa) are as p:2q:r. Finally, suppose ...

Robert Koch

... He invented methods to purify the bacillus from blood samples and grow pure cultures. He found that, while it could not survive outside a host for ... found in all cases of the disease examined prepared and maintained in a pure culture capable of producing the original infection , even after ...

Allele

... in the same bloom or red and white flowers on the same plant. Codominance is also apparent in human blood types . A gene containing the codominant pure blood type alleles "AA" and "BB" would result in a blood type of "AB". A wild type allele is an allele which is considered to be "normal" for the ...

Brain

... to reduced mental ability. Mental ability is affected by how much we use our brains, both for tasks involving coordination of body movement and in pure thought processes, such as problem solving. Myth: Learning can be achieved more powerfully through subliminal techniques. Myth: Hypnosis can ...

Carbohydrate

... Structure Glucose as a straight-chain carbohydrate ( Fischer projection ) Fructose ( Fischer projection ) pure carbohydrates contain carbon , hydrogen , and oxygen atoms , in a 1:2:1 molar ratio , giving the general formula C n H 2n O n . ...

Cellulose

... History and Applications Cellulose is a common material in plant cell walls and was first noted as such in 1838. It occurs naturally in almost pure form only in cotton fibre; in combination with lignin and any hemicellulose , it is found in all plant material. Cellulose is the most abundant ...

Chromatography

... proteins with a so-called his-tag , biotinylated or possibly antigens . After purification some of these tags are usually removed and the pure protein is obtained. See also Paper chromatography of amino acids External Links Library 4 Science online books about ...

DNA

... distinct from RNA. Friedrich Miescher ( 1844 - 1895 ) discovered a substance he called "nuclein" in 1869 . Somewhat later, he isolated a pure sample of the material now known as DNA from the sperm of salmon, and in 1889 his pupil, Richard Altmann , named it "nucleic acid". This ...

Ethyl alcohol

... History Ethanol has been known to humans since prehistory as the active ingredient of alcoholic beverages . Its isolation as a relatively pure compound was probably achieved first by Islamic alchemists who developed the art of distillation , such as Geber (721-815) and Al-Razi ...

Insulin

... 1921, and they took them up on their offer in April. In November Lilly made a major breakthrough, and were able to produce large quantities of very pure insulin. Insulin was offered for sale shortly thereafter. For this breakthrough discovery, Macleod and Banting were awarded the Nobel Prize in ...

Origin of life

... 's notion of collectively autocatalytic sets discussed later in that decade. Hybrid models A growing realization of the inadequacy of either pure "genes-first" or "metabolism-first" models is leading the trend towards models that incorporate aspects of each. Other models Clay theory ...

Osmoregulation

... that must be exerted on the hypertonic side of a selectively permeable membrane to prevent diffusion of water by osmosis from the side containing pure water. Animals in all environments (aquatic and terrestrial) must maintain the right concentration of solutes and amount of water in their body ...

Lipid bilayer

... while their electrically charged or polar heads face the watery or "aqueous" solutions on either side of the membrane. Because of the oily core, a pure lipid bilayer is permeable to small hydrophobic solutes but has only a very low permeability barrier to inorganic ions and other hydrophilic ...

Polysaccharide

... components of plants are formed primarily from cellulose . Wood is largely cellulose and lignin , while paper and cotton are nearly pure cellulose. Cellulose is a polymer made with repeated glucose units bonded together by beta- linkages. Humans and many other animals lack an ...

Proteomics

... of protein interactions on the atomic, molecular and cellular levels Protein modification . Almost all proteins are modified from their pure translated amino-acid sequence, so-called post-translational modification. Specialized methods have been developed to study phosporylation ...

Rudolf Steiner

... made in this book to have disproved transcendental idealism , the philosophy of Immanuel Kant —he had read the whole of Kant's Critique of pure Reason by the age of 14—has been rejected by some philosophers, accepted by others, and remains unknown to most. Richard Tarnas, in his ...

Species

... both of the 'pure' populations, plus first-generation and back-crossing hybrids. The strength of the barrier to genetic transmission between the two pure groups can be assessed by the width of the hybrid zone relative to the typical dispersal distance of the organisms in question. The dispersal ...

Selective serotonin reuptake inhibitor

... directly? First, serotonin ingested orally will not cross the blood-brain barrier , and therefore won't have an effect on brain functions. Second, pure serotonin would turn on every synapse it reaches, whereas SSRIs only enhance a signal that is already present, but too weak to come through. ...

Transformation

... will be partially obscured for purposes of censorship in order to maintain an equivalent to PG rating. The purpose of this is simply as an act of pure fanservice . ...
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