Definition for User contributions

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• 20:07, 25 May 2011 (diff | hist) . . (+1,421)‎ . . Demographic transition ‎
• 14:55, 13 March 2011 (diff | hist) . . (+52)‎ . . N ATP ‎ (Created page with "Adenosine triphosphate - a cellular energy molecule.") (current)
• 21:43, 6 February 2011 (diff | hist) . . (+81)‎ . . N Batesian mimicry ‎ (Created page with "The mimicry of an unpalatable species (the model) by a palatable one (the mimic).") (current)
• 21:43, 6 February 2011 (diff | hist) . . (+207)‎ . . N Nerve ‎ (Created page with "A structure found in the peripheral nervous system that is composed of multiple neurons and makes contact with structures outside the central nervous system and transmits signals...") (current)
• 21:43, 6 February 2011 (diff | hist) . . (+104)‎ . . N Nerve cord ‎ (Created page with "In more complex invertebrates, a structure that extends from the anterior end of the animal to the tail.") (current)
• 21:42, 6 February 2011 (diff | hist) . . (+115)‎ . . N Nerve impulse ‎ (Created page with "A way that neurons communicate, involving changes in the amount of electric charge across a cell's plasma membrane.") (current)
• 21:42, 6 February 2011 (diff | hist) . . (+53)‎ . . N Nerve net ‎ (Created page with "Interconnected neurons with no central control organ.") (current)
• 21:42, 6 February 2011 (diff | hist) . . (+138)‎ . . N Nervous system ‎ (Created page with "Groups of cells that sense internal and environmental changes and transmit signals that enable an animal to respond in an appropriate way.") (current)
• 21:42, 6 February 2011 (diff | hist) . . (+113)‎ . . N Nervous tissue ‎ (Created page with "Clusters of cells that initiate and conduct electrical signals from one part of an animal's body to another part.") (current)
• 21:41, 6 February 2011 (diff | hist) . . (+77)‎ . . N Net primary production (NPP) ‎ (Created page with "Gross primary production minus the energy lost in plant cellular respiration.") (current)
• 21:41, 6 February 2011 (diff | hist) . . (+42)‎ . . N Net reproductive rate ‎ (Created page with "The population growth rate per generation.") (current)
• 21:41, 6 February 2011 (diff | hist) . . (+229)‎ . . N Neural crest ‎ (Created page with "A cell lineage that gives rise to all neurons and supporting cells of the peripheral nervous system in vertebrates; in addition, it gives rise to melanocytes and to cells that fo...") (current)
• 21:40, 6 February 2011 (diff | hist) . . (+216)‎ . . N Neural tube ‎ (Created page with "In chordates, a structure formed from ectoderm located dorsal to the notochord; all neurons and their supporting cells in the central nervous system originate from neural precurs...") (current)
• 21:40, 6 February 2011 (diff | hist) . . (+47)‎ . . N Neurogenesis ‎ (Created page with "The production of new neurons by cell division.")
• 21:40, 6 February 2011 (diff | hist) . . (+102)‎ . . N Neurogenic heart ‎ (Created page with "A heart that will not beat unless it receives regular electrical impulses from the nervous system.") (current)
• 21:40, 6 February 2011 (diff | hist) . . (+107)‎ . . N Neurohormone ‎ (Created page with "A hypothalamic-releasing hormone made in and secreted by neurons whose cell bodies are in the hypothalamus.") (current)
• 21:40, 6 February 2011 (diff | hist) . . (+122)‎ . . N Neuromodulator ‎ (Created page with "Short chains of amino acids that can alter or modulate the response of the postsynaptic neuron to other neurotransmitters.") (current)
• 21:39, 6 February 2011 (diff | hist) . . (+62)‎ . . N Neuromuscular junction ‎ (Created page with "The junction between a motor neuron's axon and a muscle fibre.") (current)
• 21:39, 6 February 2011 (diff | hist) . . (+173)‎ . . N Neuron ‎ (Created page with "Another name for a nerve cell. A highly specialized cell that communicates with another cell of its kind and with other types of cells by electrical or chemical signals.") (current)
• 21:38, 6 February 2011 (diff | hist) . . (+40)‎ . . N Neuroscience ‎ (Created page with "The scientific study of nervous systems.")
• 21:38, 6 February 2011 (diff | hist) . . (+74)‎ . . N Neurotransmitter ‎ (Created page with "A small signalling molecule that is synthesized and stored in nerve cells.") (current)
• 21:38, 6 February 2011 (diff | hist) . . (+86)‎ . . N Neurulation ‎ (Created page with "The embryological process responsible for initiating central nervous system formation.") (current)
• 21:38, 6 February 2011 (diff | hist) . . (+68)‎ . . N Neutral mutation ‎ (Created page with "A mutation that does not affect the function of the encoded protein.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+153)‎ . . N Neutral theory of evolution ‎ (Created page with "States that most genetic variation is due to the accumulation of neutral mutations that have attained high frequencies in a population via genetic drift.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+55)‎ . . N Neutral variation ‎ (Created page with "Variation that does not favour any particular genotype.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+101)‎ . . N Neutralism ‎ (Created page with "The phenomenon in which two species occur together but in fact do not interact in any measurable way.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+51)‎ . . N Neutron ‎ (Created page with "A neutral particle found in the centre of the atom.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+104)‎ . . N Neutrophil ‎ (Created page with "A type of phagocyte and the most abundant type of leukocyte; neutrophils engulf bacteria by endocytosis.") (current)
• 21:37, 6 February 2011 (diff | hist) . . (+61)‎ . . N Niche ‎ (Created page with "The physical distribution and ecological role of an organism.") (current)
• 21:36, 6 February 2011 (diff | hist) . . (+111)‎ . . N Nitrification ‎ (Created page with "The conversion by soil bacteria of NH3 or NH4+ to nitrate (NO3−), a form of nitrogen commonly used by plants.") (current)
• 21:36, 6 February 2011 (diff | hist) . . (+234)‎ . . N Nitrogen fixation ‎ (Created page with "A specialized metabolic process in which certain prokaryotes use the enzyme nitrogenase to convert inert atmospheric nitrogen gas into ammonia; also, the industrial process by wh...")
• 21:36, 6 February 2011 (diff | hist) . . (+60)‎ . . N Nitrogenase ‎ (Created page with "An enzyme used in the biological process of fixing nitrogen.") (current)
• 21:36, 6 February 2011 (diff | hist) . . (+70)‎ . . N Nitrogen-limitation hypothesis ‎ (Created page with "The proposal that organisms select food based on its nitrogen content.") (current)
• 21:35, 6 February 2011 (diff | hist) . . (+134)‎ . . N Nitrogenous wastes ‎ (Created page with "Molecules that include nitrogen from amino groups; these wastes are toxic at high concentrations and must be eliminated from the body.") (current)
• 21:35, 6 February 2011 (diff | hist) . . (+148)‎ . . N Nociceptor ‎ (Created page with "A sensory receptor that responds to extreme heat, cold, and pressure, as well as to certain molecules, such as acids; also known as a pain receptor.") (current)
• 21:35, 6 February 2011 (diff | hist) . . (+12)‎ . . N Nocturnal enuresis ‎ (Created page with "Bed-wetting.") (current)
• 21:35, 6 February 2011 (diff | hist) . . (+263)‎ . . N Nod factor ‎ (Created page with "Nodulation factor; a substance produced by nitrogen-fixing bacteria in response to flavonoids secreted from the roots of potential host plants; the Nod factors bind to receptors ...") (current)
• 21:34, 6 February 2011 (diff | hist) . . (+83)‎ . . N Node ‎ (Created page with "The region of a plant stem from which one or more leaves, branches, or buds emerge.") (current)
• 21:34, 6 February 2011 (diff | hist) . . (+94)‎ . . N Nodes of Ranvier ‎ (Created page with "Exposed areas in the axons of myelinated neurons that contain many voltage-gated Na1 channels.") (current)
• 21:34, 6 February 2011 (diff | hist) . . (+72)‎ . . N Nodule ‎ (Created page with "A small swelling on a plant root that contains nitrogen-fixing bacteria.") (current)
• 21:34, 6 February 2011 (diff | hist) . . (+66)‎ . . N Nodulin ‎ (Created page with "One of several plant proteins that foster root nodule development.") (current)
• 21:34, 6 February 2011 (diff | hist) . . (+17)‎ . . N Noncoding strand ‎ (Created page with "See template.") (current)
• 21:33, 6 February 2011 (diff | hist) . . (+116)‎ . . N Noncompetitive inhibitor ‎ (Created page with "A molecule that binds to an enzyme at a location that is outside the active site and inhibits the enzyme's function.")
• 21:33, 6 February 2011 (diff | hist) . . (+116)‎ . . N Noncyclic electron flow ‎ (Created page with "The combined action of photosystem II and photosystem I in which electrons flow in a linear manner to produce NADPH.") (current)
• 21:33, 6 February 2011 (diff | hist) . . (+229)‎ . . N Non-Darwinian evolution ‎ (Created page with "Also “survival of the luckiest” to contrast it with Darwin's “survival of the fittest” theory; the idea that much of the modern variation in gene sequences is explained b...") (current)
• 21:33, 6 February 2011 (diff | hist) . . (+76)‎ . . N Nondisjunction ‎ (Created page with "An event in which the chromosomes do not sort properly during cell division.") (current)
• 21:32, 6 February 2011 (diff | hist) . . (+20)‎ . . N Nonparental type ‎ (Created page with "See recombinant.") (current)
• 21:32, 6 February 2011 (diff | hist) . . (+52)‎ . . N Nonpolar molecule ‎ (Created page with "A molecule composed predominantly of nonpolar bonds.") (current)
• 21:31, 6 February 2011 (diff | hist) . . (+90)‎ . . N Nonrandom mating ‎ (Created page with "The phenomenon that individuals choose their mates based on their genotypes or phenotypes.") (current)
• 21:31, 6 February 2011 (diff | hist) . . (+86)‎ . . N Nonrecombinant ‎ (Created page with "An offspring whose combination of traits has not changed from the parental generation.") (current)

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