radiocarbon dating
carbon dating
carbon- dating | a chemical analysis used to determine the age of organic materials based on their content of the radioisotope carbon-, believed to be reliable up to , years |
bicycle
bike
wheel cycle | a wheeled vehicle that has two wheels and is moved by foot pedals |
carbon
carbon copy | a copy made with carbon paper |
carbon arc lamp
carbon arc | has carbon electrodes |
pedicab
cycle rickshaw | a tricycle (usually propelled by pedalling), used in the Orient for transporting passengers for hire, boys who once pulled rickshaws now pedal pedicabs |
tetrachlorethylene
tetrachloroethylene
ethylene tetrachloride
carbon dichloride | anthelmintic agent used against hookworm and other nematodes |
| nitrogen narcosis | confused or stuporous state caused by high levels of dissolved nitrogen in the blood, deep-sea divers can suffer nitrogen narcosis from breathing air under high pressure |
| carbon process | a process of printing on paper coated with bichromated gelatin containing pigment |
| cycle of rebirth | (Hinduism) repeated rebirth in new forms |
| cycle oscillation | a single complete execution of a periodically repeated phenomenon, a year constitutes a cycle of the seasons |
| cardiac cycle | the complete cycle of events in the heart from the beginning of one heart beat to the beginning of the next, an electrical impulse conducted through the heart muscle that constricts the atria which is followed by constriction of the ventricles, the cardiac cycle can be shown on an electrocardiogram |
Carnot cycle
Carnot's ideal cycle | a cycle (of expansion and compression) of an idealized reversible heat engine that does work without loss of heat |
| cycle | a periodically repeated sequence of events, a cycle of reprisal and retaliation |
business cycle
trade cycle | recurring fluctuations in economic activity consisting of recession and recovery and growth and decline |
| cycle | a series of poems or songs on the same theme, Schubert's song cycles |
Bethe
Hans Bethe
Hans Albrecht Bethe | United States physicist (born in Germany) noted for research in astrophysics and nuclear physics (-) |
food web
food cycle | (ecology) a community of organisms where there are several interrelated food chains |
| life cycle | a series of stages through which an organism passes between recurrences of a primary stage |
| carbon cycle | a thermonuclear reaction in the interior of stars |
| carbon cycle | the organic circulation of carbon from the atmosphere into organisms and back again |
Krebs cycle
Krebs citric acid cycle
citric acid cycle
tricarboxylic acid cycle | in all plants and animals: a series of enzymatic reactions in mitochondria involving oxidative metabolism of acetyl compounds to produce high-energy phosphate compounds that are the source of cellular energy |
| life cycle | the course of developmental changes in an organism from fertilized zygote to maturity when another zygote can be produced |
| nitrogen cycle | the circulation of nitrogen, nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil |
| nitrogen fixation | the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria |
vicious circle
vicious cycle | one trouble leads to another that aggravates the first |
| nitrogen balance | the balance between the amount of nitrogen taken in (to the soil or the body) and the amount given off (lost or excreted) |
respiratory acidosis
carbon dioxide acidosis | acidosis resulting from reduced gas exchange in the lungs (as in emphysema or pneumonia), excess carbon dioxide combines with water to form carbonic acid which increases the acidity of the blood |
| carbon monoxide poisoning | a toxic condition that results from inhaling and absorbing carbon monoxide gas, carbon monoxide combines with hemoglobin and displaces oxygen in the blood |
carbon nanotube
nanotube | a fullerene molecule having a cylindrical or toroidal shape |
carbon
C
atomic number | an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond, occurs in all organic compounds |
| carbon atom | an atom of carbon |
radiocarbon
carbon | a radioactive isotope of carbon |
nitrogen
N
atomic number | a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas, constitutes percent of the atmosphere by volume, a constituent of all living tissues |
| nitrogen oxide | any of several oxides of nitrogen formed by the action of nitric acid on oxidizable materials, present in car exhausts |
| nitrogen dioxide | a highly poisonous brown gas (NO) |
carbon black
lampblack
soot
smut
crock | a black colloidal substance consisting wholly or principally of amorphous carbon and used to make pigments and ink |
activated carbon
activated charcoal | powdered or granular carbon used for purifying by adsorption, given orally (as a slurry) it is an antidote for some kinds of poisons |
carbon dioxide
CO
carbonic acid gas | a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances, absorbed from the air by plants in photosynthesis |
| carbon disulfide | a toxic colorless flammable liquid (CS), used in the manufacture of rayon and cellophane and carbon tetrachloride and as a solvent for rubber |
carbon monoxide
carbon monoxide gas
CO | an odorless very poisonous gas that is a product of incomplete combustion of carbon |
carbon paper
carbon | a thin paper coated on one side with a dark waxy substance (often containing carbon), used to transfer characters from the original to an under sheet of paper |
carbon tetrachloride
carbon tet
tetrachloromethane
perchloromethane | a colorless nonflammable liquid used as a solvent for fats and oils, because of its toxicity its use as a cleaning fluid or fire extinguisher has declined |
| carbon tetrahalide | compounds composed of carbon and halogen molecules |
| carbon steel | steel whose characteristics are determined by the amount of carbon it contains |
| liquid nitrogen | nitrogen in a liquid state |
| nitrogen mustard | a toxic compound resembling mustard gas in structure, important in cancer treatment |
nitrogen trichloride
Agene | a yellow pungent volatile oil (trade name Agene) formerly used for bleaching and aging flour |
hertz
Hz
cycle per second
cycles
second
cps
cycle | the unit of frequency, one hertz has a periodic interval of one second |
cycle
rhythm
round | an interval during which a recurring sequence of events occurs, the never-ending cycle of the seasons |
| menstrual cycle | a recurring cycle (beginning at menarche and ending at menopause) in which the endometrial lining of the uterus prepares for pregnancy, if pregnancy does not occur the lining is shed at menstruation, the average menstrual cycle is days |