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Definition
| Biology . a long, lashlike appendage serving as an organ of locomotion in protozoa, sperm cells, etc. |
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| a wheel, with a grooved rim for carrying a line, that turns in a frame and serves to change the direction of or to transmit force, as when one end of the line is pulled to raise a weight at the other end: one of the simple machines. |
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| Physics . the time required for one half the atoms of a givenamount of a radioactive substance to disintegrate. |
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| a body so suspended from a fixed point as to move to and froby the action of gravity and acquired momentum. |
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| Chemistry . the electrostatic bond between two ions formed throughthe transfer of one or more electrons. |
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Definition
the use of a dna probe for the identification of an individual, as for the
matching of genes from a forensic sample with those of acriminal suspect. |
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Definition
a celestial body moving about the sun, usually in a highly eccentricorbit,
consisting of a central mass surrounded by an envelope ofdust and gas
that may form a tail that streams away from the sun. |
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Cell Biology .
the stage in mitosis or meiosis in which the duplicated chromosomes
line up along the equatorial plate of the spindle.
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Definition
A lens having at least one surface curved like the inner surface of a
sphere. |
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Definition
an atmospheric heating phenomenon, caused by short-wavesolar radiation being readily transmitted inward throughthe
earth's atmosphere but longer-wavelength heat radiationless readily transmitted outward, owing to
its absorption byatmospheric carbon dioxide, water vapor, methane, and othergases; thus, the rising level of carbon dioxide
is viewed withconcern. |
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Definition
a cell with a true nucleus; a cell with a nuclearmembrane and organelles;
cf. prokaryotic cell |
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Definition
| a cell lacking a true membrane-bound nucleus |
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Definition
the passage of water through a plant from the rootsthrough the
vascular system to the atmosphere. |
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Definition
Anatomy . a bone in the human leg extending from the pelvisto
the knee, that is the longest, largest, and strongest in thebody;
thighbone. |
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Definition
Genetics .
any of several forms of a gene, usually arising through mutation,that are
responsible for hereditary variation.
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Definition
Biology . a taxonomic category of the highest rank, groupingtogether
all forms of life having certain fundamentalcharacteristics in common:
in the fivekingdom classificationscheme adopted by many biologists,
separate
kingdoms areassigned to animals (Animalia), plants (Plantae), fungi(Fungi), protozoa and eucaryotic algae (Protista), andbacteria and blue-green algae (Monera). |
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Definition
Chemistry . a compound usually having a sour taste andcapable of
neutralizing alkalis and reddening blue litmuspaper, containing hydrogen
that can be replaced by a metalor an electropositive group to form a salt
, or containing anatom that can accept a pair of electrons from a base.
Acidsare proton donors that yield hydronium ions in water solution,or
electron-pair acceptors that combine with electron-pairdonors or bases. |
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Definition
| a detailed, part-by-part analysis. |
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Definition
| any combustible organic material, as oil, coal, or natural gas,derived from the remains of former life. |
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Definition
a hollow cylinder of thin glass with one end closed, used inchemical
and biological experimentation and analysis. |
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Definition
| Goggles or safety glasses are forms of protective eyewear that usually enclose or protect the area surrounding the eye in order to prevent particulates, water or chemicals from striking the eyes. They are used in chemistry laboratories and in woodworking. They are often used in snow sports as well, and in swimming. Goggles are often worn when using power tools such as drills or chainsaws to prevent flying particles from damaging the eyes. Many types of goggles are available as prescription goggles for those with vision problems. |
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Definition
the force of attraction by which terrestrial bodies tend to fall toward
the center of the earth. |
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Definition
a series of vibrations induced in the earth's crust by the abrupt rupture
and rebound of rocks in which elastic strainhas been slowly accumulating. |
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Definition
Chemistry .
a table illustrating the periodic system, in which the chemicalelements,
formerly arranged in the order of their atomic weightsand now
according to their atomic numbers, are shown in relatedgroups.
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Definition
1.Physiology . of or pertaining to hypertonia.
2.
Physical Chemistry . noting a solution of higher osmotic pressure
than another solution with which it is compared (opposed to
hypotonic). Compare isotonic ( def. 1 ) .
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Definition
any of various small insectivorous mammals, especially of the family
Talpidae, living chiefly underground, and having velvetyfur, very small
eyes, and strong forefeet. |
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Definition
the roundish reproductive body produced by the female ofcertain
animals, as birds and most reptiles, consisting of anovum and its
envelope of albumen, jelly, membranes, egg case, or shell, according to species. |
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Definition
the process by which the surface of the earth is worn awayby the
action of water, glaciers, winds, waves, etc. |
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Definition
Physics .
a.
the process in which energy is emitted as particles orwaves.
b.
the complete process in which energy is emitted by onebody,
transmitted through an intervening medium orspace, and absorbed
by another body.
c.
the energy transferred by these processes.
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Definition
a form of energy obtained from within the earth,originating in its core;
also, energy produced byextracting the earth's internal heat
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Definition
1.Ecology . the circulation of carbon atoms in the biosphere asa
result of photosynthetic conversion of carbon dioxide intocomplex organic compounds by plants, which are
consumedby other organisms: the carbon returns to the
atmosphere inthe form of carbon dioxide as a result of respiration,
decay byfungi, bacteria, etc., and combustion of fossil fuels.
2.
Astrophysics . a cycle of nuclear transformations in theinteriors
of the stars by means of which hydrogen is graduallyconverted
into helium with the release of nuclear energy.
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Definition
the galaxy containing the solar system; consists of millions of starsthat
can be seen as a diffuse band of light stretching across thenight sky
[syn: Milky Way] |
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Definition
a device consisting of an iron or steel core that is magnetized byelectric
current in a coil that surrounds it. |
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Definition
Biochemistry .
any of various proteins, as pepsin, originating from living cells and
capable of producing certain chemical changes in organicsubstances
by catalytic action, as in digestion.
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Definition
1.Also, epicentrum. Geology . a point, directly above the true
center of disturbance, from which the shock waves of an
earthquake apparently radiate.
2.
a focal point, as of activity: Manhattan's Chinatown is the
epicenter of the city's Chinese community.
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Definition
Cell Biology .
a cell that upon division replaces its own numbers and also gives
rise to cells that differentiate further into one or more specializedtypes,
as various B cells and T cells.
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Definition
1.Physics . the property or power of conducting heat,electricity,
or sound.
2.
Also called specific conductance. Electricity . a measure of the
ability of a given substance to conduct electric current,equal to
the reciprocal of the resistance of the substance.Symbol: σ
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Term
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Definition
to cover, line, or separate with a material that prevents orreduces
the passage, transfer, or leakage of heat, electricity,or sound:
to insulate an electric wire with a rubber sheath;to insulate a coat
with down. |
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Definition
Meteorology .
a cloud of a class characterized by a generally uniform gray
sheetor layer, lighter in color than nimbostratus and darker than
cirrostratus: of medium altitude, about 8000–20,000 feet (2450–6100 meters).
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Definition
Statistics .
a measure of dispersion in a frequency distribution, equal tothe
square root of the mean of the squares of the deviations fromthe
arithmetic mean of the distribution.
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Definition
Chemistry .
the analysis of a substance in order to ascertain the nature of its
chemical constituents.
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Definition
Physical Chemistry .
1.
a positively charged ion that is attracted to the cathode
inelectrolysis.
2.
any positively charged atom or group of atoms ( opposed toanion).
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Definition
–noun
1.
a class of individuals having some common characteristics or
qualities; distinct sort or kind.
2.
Biology . the major subdivision of a genus or subgenus,regarded
as the basic category of biological classification,composed of
related individuals that resemble one another,are able to breed
among themselves, but are not able tobreed with members of
another species.
3.
Logic .
a.
one of the classes of things included with other classes
in a genus.
b.
the set of things within one of these classes.
4.
Ecclesiastical .
a.
the external form or appearance of the bread or the wine
in the Eucharist.
b.
either of the Eucharistic elements.
5.
Obsolete . specie; coin.
6.
the species, the human race; mankind: a study of thespecies.
–adjective
7.
Horticulture . pertaining to a plant that is a representative
member of a species, one that is not a hybrid or variety:
aspecies rose; a species gladiolus.
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Definition
Pathology .
1.
any of several disorders characterized by increased urine
production.
a disorder of carbohydrate metabolism, usually occurring ingenetically
predisposed individuals, characterized byinadequate production or
utilization of insulin and resulting inexcessive amounts of glucose in the
blood and urine,excessive thirst, weight loss, and in some cases
progressivedestruction of small blood vessels leading to such
complications as infections and gangrene of the limbs orblindness. |
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Term
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Definition
a relationship between two species of organisms in which
both benefit from the association.
2.
the doctrine that the interdependence of social elements is
the primary determinant of individual and social relations,especially
the theory that common ownership of property, orcollective effort
and control governed by sentiments ofbrotherhood and mutual aid, will be beneficial to both theindividual and society.
3.
Sociology . the force or principle of mutual aid.
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Definition
Astronomy . the point in the orbit of a planet or a comet at which
it is farthest from the sun. |
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Definition
Cell Biology .
a hollow cylindrical structure in the cytoplasm of most cells,involved in
intracellular shape and transport.
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Definition
Geology . a basic law of geochronology, stating that in anyundisturbed
sequence of rocks deposited in layers, the youngestlayer is on top
and the oldest on bottom, each layer being youngerthan the one
beneath it and older than the one above it. |
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Definition
| a nucleotide derived from adenosine that occurs in muscle tissue; the major source of energy for cellular reactions |
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Definition
Physics .
the amount of heat required to raise the temperature of 1
pound(0.4 kg) of water 1°F. Abbreviation:
Btu, BTU, B.t.u., B.T.U.,B.th.u.
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