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Compound in Biological Definition

Antibiotic

... to medicine. Although he was unable to purify the compound (the beta-lactam ring in the penicillin ... was of the genus Penicillium , he named this compound penicillin. This USPS stamps notes ... susceptibility of this new population to the compound will be much less than that of the original ...

Chromatography

... retention factor R f , the run length of the compound divided by the run length of the eluent front: The retention of a compound often differs considerably between experiments ... important to compare the retention of the test compound to that of one or more standard compounds under ...

Leaf

... gaps between lobes do not reach to the vein. compound leaves have divided blades, each leaflet separated along a main or secondary vein. Palmately compound leaves have the leaflets radiating from the end ... (hemp) and Aesculus (buckeyes). Pinnately compound leaves have the leaflets arranged along the main ...

Microscope

... 1 Simple optical microscope 2 compound optical microscope 2.1 Stereo microscope ... A simple microscope , as opposed to a standard compound microscope (see below) with multiple lenses, is a ... glass , the hand-lens , and the loupe . compound optical microscope The diagrams below show ...

Alcohol

... In chemistry , alcohol is a more general term, applied to any organic compound in which a hydroxyl group ( - O H ) is bound to a carbon atom, ... of the hydrogens. If an aryl group is present rather than an alkyl, the compound is generally called a phenol rather than an alcohol. The oxygen in an ...

Ethyl alcohol

... known as ethanol or grain alcohol , is a flammable, colorless chemical compound , one of the alcohols that is most often found in alcoholic beverages . ... ingredient of alcoholic beverages . Its isolation as a relatively pure compound was probably achieved first by Islamic alchemists who developed the art ...

Amine

... atom in the group (groups symbolized by R below). However, if any of the carbons bonded to the nitrogen is part of a carbonyl group, then the compound is considered an amide rather than an amine. See the Category:Amines for a list of types of amine and some real examples of this class of ...

Ames test

... The Ames test is a biological assay used in genetics , generally genetic toxicology , to test for mutagenic properties of a chemical compound. A compound is said to be mutagenic if it causes a change in the DNA (deoxyriboneucleic acid) of a living cell or organism. The test is named after its ...

Blood

... Human blood is red , ranging from bright red when oxygenated to dark red when not. It owes its colour to hemoglobin , a metalloprotein compound containing iron in the form of heme , to which oxygen binds. There exists a popular misconception that deoxygenated blood is blue and that ...

C4 carbon fixation

... The chemical equation is: PEP carboxylase + PEP + CO 2 → oxaloacetate The product is usually converted to malate , a simple organic compound that gives up its CO 2 to the Calvin cycle after being shipped off to bundle sheath cells surrounding a nearby vein . After losing the CO 2 , it ...

Enzyme

... can be used to "drive" a thermodynamically unfavorable one, in effect running the reaction 'backwards', or 'uphill'. For instance, the high energy compound ATP is generated in the cell by coupling its synthesis to the oxidation of sugars , which releases more energy than the syntehsis of ATP requires; ...

Equilibrium

... , the state in which a chemical reaction proceeds at the same rate as its reverse reaction, resulting in no net change in the amount of each compound . Mechanical equilibrium , also known as static equilibrium , the state of a body at rest or in uniform motion in which the sum of all forces ...

Eye

... 2 Focusing 3 Convergence 4 Ocular Anatomy 5 Eye Related Problems 6 See also 7 External links Varieties of eye compound eyes are found among the arthropods (insects and kin), and are composed of many simple facets which give a pixelated image (not multiple images as ...

Louis Pasteur

... polarization of light In his early work as a chemist he resolved a problem concerning the nature of tartaric acid ( 1849 ). A solution of this compound derived from living things (specifically, wine lees) rotated the plane of polarization of light passing through it. The mystery was that tartaric ...

Malaria

... chance of malaria, as well as the discomfort of insect bites. Extracts from the plant Artemisia (specifically Artemisia annua ), containing the compound artemisinin , a substance unrelated to the quinine derivatives, offer some future promise. Prospects of disease control Vaccines for malaria ...

Redox

... by a molecule or atom. These two terms go together, because in a chemical reaction, one cannot occur without the other; electrons lost by one compound must be gained by another. Contents showTocToggle("show","hide") 1 Oxidizing and Reducing agents 2 Former meaning ...

Photolysis

... Photolysis refers to any chemical reaction in which a compound is broken down by light . Photolysis is a part of photosynthesis , which occurs in the granum of the chloroplast . In photolysis the light ...

Protein

... . A protein (in Greek πρωτεϊνη = first element ) is a complex, high molecular weight organic compound that consists of amino acids joined by peptide bonds . Proteins are essential to the structure and function of all living cells and viruses ...

Purine

... Melting point 214 C CAS number 120-73-0 SMILES C1(NC=N2)=C2C=NC=N1 Purine is a heterocyclic aromatic organic compound , consisting of a pyrimidine ring fused to an imidazole ring. The general term purines also refers to substituted purines and their ...

Pyrimidine

... Boiling point 123 - 124 C CAS number 289-95-2 SMILES C1=NC=NC=C1 Pyrimidine is a heterocyclic aromatic organic compound , which is similar to benzene and pyridine and that contains two nitrogen atoms at positions 1 and 3 of the six-membered ring. Three ...

Redox

... by a molecule or atom. These two terms go together, because in a chemical reaction, one cannot occur without the other; electrons lost by one compound must be gained by another. Contents showTocToggle("show","hide") 1 Oxidizing and Reducing agents 2 Former meaning ...

Xylem

... is one of the two types of transport tissues in plants. The cell walls of xylem cells derive most of their strength from lignin , a chemical compound produced only by plants. Contents showTocToggle("show","hide") 1 Structure 2 Contents 3 Mechanism 4 Reference ...
Other Contents
(Date:9/30/2014)... the popular attention of both children and aquarium hobbyists ... as dehydrated eggs, these tiny brine shrimp readily hatch, ... of salt water. , Physicists, though, are interested ... vertically migrate in large groups in response to changing ... and retreating deeper during the day. , Two researchers ...
(Date:9/30/2014)... Medicine reports positive results of a phase 1 ... of lung cancer marked by rearrangement of the gene ... advanced non-small cell lung cancer testing positive for ROS1 ... 3 complete responses and 33 partial responses. Median progression-free ... to resume its growth after being slowed by treatment ...
(Date:9/30/2014)... Ludwig-Maximilians-Universitaet (LMU) in Munich report that a new ... sensitive to chemotherapeutic drugs. They have also pinpointed ... target for anti-tumor agents. , Researchers led ... Sieber of the Technische Universitt Mnchen have identified ... new weapon in the fight against malignant tumors. ...
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(Date:10/2/2014)... HealthDay Reporter WEDNESDAY, ... a neurotic personality style and prolonged stress may have ... suggests. Tracking 800 women over nearly four decades, ... jealous and moody -- which they defined as neurotic ... of developing Alzheimer,s compared to women scoring lowest in ...
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(Date:10/2/2014)... Dennis Thompson HealthDay ... Forty-two states and the District of Columbia now have a ... respiratory illness that has been infecting children since the ... with the virus have died in recent weeks, but it,s ... played in those deaths, officials said. Health officials are ...
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