gap gradient

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• Water gap — A water gap is an opening or notch which flowing water has carved through a mountain range. Water gaps often offer a practical route for roads and railroads to cross a mountain ridge. Geological implications A water gap is usually an indication… …   Wikipedia

• Stokenchurch Gap — The Stokenchurch Gap, also known as the Aston Rowant Cutting or Aston Hill cutting (from the nearby village of Aston Rowant), or locally The Canyon [1] is a steep chalk cutting, constructed through the Chiltern Hills in Oxfordshire, England… …   Wikipedia

• submarine gap — ▪ geology also called  Abyssal Gap,         steep sided furrow that cuts transversely across a ridge or rise; such a passageway has a steeper slope than either of the two abyssal plains it connects. Grooves known as interplain channels exist in… …   Universalium

• cell — cell1 cell like, adj. /sel/, n. 1. a small room, as in a convent or prison. 2. any of various small compartments or bounded areas forming part of a whole. 3. a small group acting as a unit within a larger organization: a local cell of the… …   Universalium

• particle accelerator — accelerator (def. 7). [1945 50] * * * Device that accelerates a beam of fast moving, electrically charged atoms (ions) or subatomic particles. Accelerators are used to study the structure of atomic nuclei (see atom) and the nature of subatomic… …   Universalium

• nervous system — Anat., Zool. 1. the system of nerves and nerve centers in an animal or human, including the brain, spinal cord, nerves, and ganglia. 2. a particular part of this system. Cf. autonomic nervous system, central nervous system, peripheral nervous… …   Universalium

• Drosophila embryogenesis — Drosophila embryogenesis, the process by which Drosophila (fruit fly) embryos form, is a favorite model system for geneticists and developmental biologists studying embryogenesis. The small size, short generation time, and large brood size make… …   Wikipedia

• PARTICULES (ACCÉLÉRATEURS DE) — Les modèles et théories qui synthétisent notre compréhension actuelle de la matière et de ses constituants élémentaires – molécules, atomes, particules – ont été confrontés à une multitude d’observations expérimentales. Pour réaliser ces… …   Encyclopédie Universelle

• Effet maternel — En génétique du développement, un gène à effet maternel est un gène exprimé par la mère lors de l ovogenèse. Ce type de gène est essentiellement connu par l analyse du développement embryonnaire de Drosophila melanogaster mais aussi de Danio… …   Wikipédia en Français

• magnetism — /mag ni tiz euhm/, n. 1. the properties of attraction possessed by magnets; the molecular properties common to magnets. 2. the agency producing magnetic phenomena. 3. the science dealing with magnetic phenomena. 4. strong attractive power or… …   Universalium

• Economic inequality — refers to disparities in the distribution of economic assets and income. The term typically refers to inequality among individuals and groups within a society, but can also refer to inequality among nations. Economic Inequality generally refers… …   Wikipedia