The symbol representing the long arm of a chromosome.
2. Q
Author:
Definition:
The symbol used by hydrologists to represent flow. It may also mean the design flow for a particular project. With a subscript number, Q refers to a flow recurrence interval; Q10 is the flow that occurs, on the average, only once in 10 years (also known as the 10% frequency, or recurrence, event), Q25 is the flow which occurs only every 25 years (4% event), and Q100 occurs once in 100 years (1% event). The recurrence interval is a statistical average, not a fixed number of years. Q10, Q25, and Q100 are common design standards for flood control projects.
3. Q banding
Author: Guo Li
Definition:
Q banding is a method of identifying chromosomes in a karyotype that have abnormalities by staining the chromosomes with quinacrine dye. When the chromosomes are viewed with a fluorescent microscope after this treatment, unique patterns of fluorescent bands are seen with each chromosome.
4. Q fever
Definition:
A disease caused by the bacterium Coxiella burneti which mainly afflicts sheep and cattle but can be transmitted to humans who have contact with infected animals. Symptoms resemble those of influenza and include fever, headache and lung inflammation.
5. Q wave
Author: Guo Li
Definition:
A Q wave is a negative deflection at the onset of a QRS complex in an electrocardiogram. An abnormal Q wave is one that spans 0.04 seconds or more in duration and reaches greater than 25% of the amplitude of the adjacent R wave.
6. Qß phage
Definition:
A single-stranded RNA phage that specifically infects enterobacteria containing the F plasmid. It is widely used to study RNA phage and bacterial cell function.
7. quadrat
Author:
Definition:
Sample units or plots that vary in size, shape, number and arrangements, depending on the nature of the vegetation, site conditions and purpose of study.
8. quadriceps
Author: Guo Li
Definition:
Quadriceps is the term usually used when referring to the quadriceps femoris muscles, which are the extensor muscles of the leg covering the front and sides of the femur. It consists of four muscles: rectus femoris, vastus lateralis, medialis, and intermedius.
9. quadriplegia (adj. quadriplegic)
Author: Guo Li
Definition:
Quadriplegia is the condition of paralysis of all four limbs.
10. quadrivalent
Definition:
Describes an association of four homologous chromosomes at meiosis.
11. quality of life
Author: Guo Li
Definition:
Quality of life is a reference to the well-being of a patient, a concept often applied when an assessment of an elderly is made. There are 3 major components of the quality of life:
12. quantal effect (all-or-none effect)
Author: Biological Sciences at
Heriot-Watt University
Definition:
A quantal effect is one which either happens or does not happen, e.g. death.
13. quantify
Definition:
To express as a numerical amount.
14. quantitative
Author:
Definition:
A precise measurement or determination expressed numerically.
15. quantum
Definition:
The fundamental unit of electromagnetic energy.
16. quantum evolution
Definition:
An extremely rapid evolutionary change in a single genetic lineage, thought to result from a sudden and radical change in the species' environment.
17. quantum speciation (saltational speciation)
Definition:
The rapid evolution of a new species from a small population that is partially or totally isolated from the parent population; the rapid speciation occurs due to genetic drift and founder effect and usually involves a few mutations that have a big impact on the organisms' observable physical traits.
18. quantum sufficiat (q.s.)
Definition:
This Latin term, which is frequently used in medicine and pharmacy, means "a sufficient quantity".
19. quarantine
Author: Mirrored from
Tsute Chen's
Glossary of Microbiology
Definition:
The limitation on the freedom of movement of an individual, to prevent spread of a disease to other members of a population.
20. quarantine
Author: Guo Li
Definition:
A quarantine is a period of isolation of suspected or known disease carriers to prevent the spreading of communicable diseases.
21. quark
Definition:
An elementary subatomic particle that composes a hadron. There are several "flavors" of quarks:
22. quarrying
Author:
Definition:
Extraction of non-ore materials such as limestone, sand and gravel from open pits (quarries).
23. quartan
Definition:
A cyclic fever in which 72 hours elapse between attacks.
24. quaternary structure
Definition:
The three-dimensional structure of a complex protein; this especially refers to the way the polypeptide subunits fit together.
25. quellung reaction
Definition:
A technique of making the outer cell wall of a bacterium more visible (darker) by applying a certain antiserum to it.
26. quickening
Author: Guo Li
Definition:
Quickening is the first perception of fetal movement in pregnancy which often is at about 18 to 20 weeks of gestation for first a pregnancy and at about 14 to 16 weeks of gestation for a subsequent pregnancy.
27. quinaphthol (chinaphthol)
Definition:
A drug used as an intestinal antiseptic.
28. quincuncial
Author: Mirrored from
Jim Croft's Flora of
Australia
Definition:
29. quinestrol
Image:
View the
chemical structure
Definition:
A synthetic form of estrogen used in oral contraceptives.
30. quinine
Image:
View the chemical structure
Definition:
An alkaloid extract from the bark of the cinchona tree which is used to treat malaria and fever; it is also a minor ingredient in tonic water. Quinine poisoning produces symptoms such as nausea, rash, ringing in the ears, and possibly heart failure.
31. quinsy
Author: Guo Li
Definition:
Quinsy is a bacterial infection of the tonsil(s) which may include surrounding tissues (peritonsillar cellulitis).
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