| slovo | definícia |
CH2OH
(gcide) | Primary \Pri"ma*ry\, a. [L. primarius, fr. primus first: cf. F.
primaire. See Prime, a., and cf. Premier, Primero.]
1. First in order of time or development or in intention;
primitive; fundamental; original.
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The church of Christ, in its primary institution.
--Bp. Pearson.
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These I call original, or primary, qualities of
body. --Locke.
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2. First in order, as being preparatory to something higher;
as, primary assemblies; primary schools.
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3. First in dignity or importance; chief; principal; as,
primary planets; a matter of primary importance.
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4. (Geol.) Earliest formed; fundamental.
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5. (Chem.) Illustrating, possessing, or characterized by,
some quality or property in the first degree; having
undergone the first stage of substitution or replacement.
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Primary alcohol (Organic Chem.), any alcohol which possess
the group CH2.OH, and can be oxidized so as to form a
corresponding aldehyde and acid having the same number of
carbon atoms; -- distinguished from {secondary & tertiary
alcohols}.
Primary amine (Chem.), an amine containing the amido group,
or a derivative of ammonia in which only one atom of
hydrogen has been replaced by a basic radical; --
distinguished from secondary & tertiary amines.
Primary amputation (Surg.), an amputation for injury
performed as soon as the shock due to the injury has
passed away, and before symptoms of inflammation
supervene.
Primary axis (Bot.), the main stalk which bears a whole
cluster of flowers.
Primary colors. See under Color.
Primary meeting, a meeting of citizens at which the first
steps are taken towards the nomination of candidates, etc.
See Caucus.
Primary pinna (Bot.), one of those portions of a compound
leaf or frond which branch off directly from the main
rhachis or stem, whether simple or compounded.
Primary planets. (Astron.) See the Note under Planet.
Primary qualities of bodies, such are essential to and
inseparable from them.
Primary quills (Zool.), the largest feathers of the wing of
a bird; primaries.
Primary rocks (Geol.), a term early used for rocks supposed
to have been first formed, being crystalline and
containing no organic remains, as granite, gneiss, etc.;
-- called also primitive rocks. The terms Secondary,
Tertiary, and Quaternary rocks have also been used in like
manner, but of these the last two only are now in use.
Primary salt (Chem.), a salt derived from a polybasic acid
in which only one acid hydrogen atom has been replaced by
a base or basic radical.
Primary syphilis (Med.), the initial stage of syphilis,
including the period from the development of the original
lesion or chancre to the first manifestation of symptoms
indicative of general constitutional infection.
Primary union (Surg.), union without suppuration; union by
the first intention.
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CH3-CH2-OH
(gcide) | molecular formula \mo*lec"u*lar form"u*la\, n. (Chem.)
An expression representing the composition of elements in a
chemical substance, commonly consisting of a series of
letters and numbers comprising the atomic symbols of each
element present in a compound followed by the number of atoms
of that element present in one molecule of the substance.
Thus the molecular formula for common alcohol (ethyl alcohol)
is C2H6O, meaning that each molecule contains two carbon
atoms, six hydrogen atoms, and one oxygen atom. The molecular
formula may be written to provide some indication of the
actual structure of the molecule, in which case structural
units may be written separately. Thus, ethyl alcohol can also
be written as CH3.CH2.OH or CH3-CH2-OH, in which the
period or dash between functional groups indicates a single
bond between the principle atoms of each group. This formula
shows that in ethyl alcohol, the carbon of a methyl group
(CH3-) is attached to the carbon of a methylene group
(-CH2-), which is attached to the oxygen of a hydroxyl
group (-OH). A structural formula is a graphical
depiction of the relative positions of atoms in a molecule,
and may be very complicated.
[PJC]Alcohol \Al"co*hol\ ([a^]l"k[-o]*h[o^]l), n. [Cf. F. alcool,
formerly written alcohol, Sp. alcohol alcohol, antimony,
galena, OSp. alcofol; all fr. Ar. al-kohl a powder of
antimony or galena, to paint the eyebrows with. The name was
afterwards applied, on account of the fineness of this
powder, to highly rectified spirits, a signification unknown
in Arabia. The Sp. word has both meanings. Cf. Alquifou.]
1. An impalpable powder. [Obs.]
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2. The fluid essence or pure spirit obtained by distillation.
[Obs.] --Boyle.
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3. Pure spirit of wine; pure or highly rectified spirit
(called also ethyl alcohol or ethanol, CH3.CH2.OH);
the spirituous or intoxicating element of fermented or
distilled liquors, or more loosely a liquid containing it
in considerable quantity. It is extracted by simple
distillation from various vegetable juices and infusions
of a saccharine nature, which have undergone vinous
fermentation.
Note: [The ferementation is usually carried out by addition
of brewer's yeast, Saccharomyces cerevisiae to an
aqueous solution containing carbohydrates.]
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Note: As used in the U. S. "Pharmacop[oe]ia," alcohol
contains 91 per cent by weight of ethyl alcohol and 9
per cent of water; and diluted alcohol (proof spirit)
contains 45.5 per cent by weight of ethyl alcohol and
54.5 per cent of water.
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4. (Organic Chem.) A class of compounds analogous to vinic
alcohol in constitution. Chemically speaking, they are
hydroxides of certain organic radicals; as, the radical
ethyl forms common or ethyl alcohol (C2H5.OH); methyl
forms methyl alcohol (CH3.OH) or wood alcohol; amyl
forms amyl alcohol (C5H11.OH) or fusel oil, etc.
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CH3CH2OH
(gcide) | molecular formula \mo*lec"u*lar form"u*la\, n. (Chem.)
An expression representing the composition of elements in a
chemical substance, commonly consisting of a series of
letters and numbers comprising the atomic symbols of each
element present in a compound followed by the number of atoms
of that element present in one molecule of the substance.
Thus the molecular formula for common alcohol (ethyl alcohol)
is C2H6O, meaning that each molecule contains two carbon
atoms, six hydrogen atoms, and one oxygen atom. The molecular
formula may be written to provide some indication of the
actual structure of the molecule, in which case structural
units may be written separately. Thus, ethyl alcohol can also
be written as CH3.CH2.OH or CH3-CH2-OH, in which the
period or dash between functional groups indicates a single
bond between the principle atoms of each group. This formula
shows that in ethyl alcohol, the carbon of a methyl group
(CH3-) is attached to the carbon of a methylene group
(-CH2-), which is attached to the oxygen of a hydroxyl
group (-OH). A structural formula is a graphical
depiction of the relative positions of atoms in a molecule,
and may be very complicated.
[PJC]Alcohol \Al"co*hol\ ([a^]l"k[-o]*h[o^]l), n. [Cf. F. alcool,
formerly written alcohol, Sp. alcohol alcohol, antimony,
galena, OSp. alcofol; all fr. Ar. al-kohl a powder of
antimony or galena, to paint the eyebrows with. The name was
afterwards applied, on account of the fineness of this
powder, to highly rectified spirits, a signification unknown
in Arabia. The Sp. word has both meanings. Cf. Alquifou.]
1. An impalpable powder. [Obs.]
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2. The fluid essence or pure spirit obtained by distillation.
[Obs.] --Boyle.
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3. Pure spirit of wine; pure or highly rectified spirit
(called also ethyl alcohol or ethanol, CH3.CH2.OH);
the spirituous or intoxicating element of fermented or
distilled liquors, or more loosely a liquid containing it
in considerable quantity. It is extracted by simple
distillation from various vegetable juices and infusions
of a saccharine nature, which have undergone vinous
fermentation.
Note: [The ferementation is usually carried out by addition
of brewer's yeast, Saccharomyces cerevisiae to an
aqueous solution containing carbohydrates.]
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Note: As used in the U. S. "Pharmacop[oe]ia," alcohol
contains 91 per cent by weight of ethyl alcohol and 9
per cent of water; and diluted alcohol (proof spirit)
contains 45.5 per cent by weight of ethyl alcohol and
54.5 per cent of water.
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4. (Organic Chem.) A class of compounds analogous to vinic
alcohol in constitution. Chemically speaking, they are
hydroxides of certain organic radicals; as, the radical
ethyl forms common or ethyl alcohol (C2H5.OH); methyl
forms methyl alcohol (CH3.OH) or wood alcohol; amyl
forms amyl alcohol (C5H11.OH) or fusel oil, etc.
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HOCH2CHOH4CH2OH
(gcide) | mannitol \man"ni*tol\, n. [Mannite + -ol.]
1. (Chem.) A white crystalline hexose
(HO.CH2.(CHOH)4.CH2.OH) of a sweet taste obtained from a
so-called manna, the dried sap of the flowering ash
(Fraxinus ornus); -- called also mannite, and {hydroxy
hexane}. Cf. Dulcite. It is used in pharmacy as
excipient and diluent for solids and liquids. It is also
used as a food additive for anti-caking properties, or as
a sweetener, and, illegally, to "cut" (dilute) illegal
drugs such as cocaine or heroin.
Syn: D-mannitol; manna sugar; cordycepic acid; Diosmol;
Mannicol; Mannidex; Osmiktrol; Osmosal.
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RCH2OH
(gcide) | Secondary \Sec"ond*a*ry\, a. [Cf. F. secondaire, L. secundaire.
See Second, a.]
1. Succeeding next in order to the first; of second place,
origin, rank, etc.; not primary; subordinate; not of the
first order or rate.
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Wheresoever there is moral right on the one hand, no
secondary right can discharge it. --L'Estrange.
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Two are the radical differences; the secondary
differences are as four. --Bacon.
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2. Acting by deputation or delegated authority; as, the work
of secondary hands.
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3. (Chem.) Possessing some quality, or having been subject to
some operation (as substitution), in the second degree;
as, a secondary salt, a secondary amine, etc. Cf.
primary.
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Note: A primary amine has the general formula R.NH2; a
secondary amine has the general formula R.NH.R',
where R and R' are alkyl or aryl groups. A primary
alcohol has the general formula R.CH2.OH; a secondary
alcohol has the general formula R.CHOH.R'. Tertiary
amines and alcohols have the general formulas
R.CR'N.R' and R.CR'OH.R', respectively.
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4. (Min.) Subsequent in origin; -- said of minerals produced
by alteration or deposition subsequent to the formation of
the original rock mass; also of characters of minerals (as
secondary cleavage, etc.) developed by pressure or other
causes.
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5. (Zool.) Pertaining to the second joint of the wing of a
bird.
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6. (Med.)
(a) Dependent or consequent upon another disease; as,
Bright's disease is often secondary to scarlet fever.
(b) Occurring in the second stage of a disease; as, the
secondary symptoms of syphilis.
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Secondary accent. See the Note under Accent, n., 1.
Secondary age. (Geol.) The Mesozoic age, or age before the
Tertiary. See Mesozoic, and Note under Age, n., 8.
Secondary alcohol (Chem.), any one of a series of alcohols
which contain the radical CH.OH united with two
hydrocarbon radicals. On oxidation the secondary alcohols
form ketones.
Secondary amputation (Surg.), an amputation for injury,
performed after the constitutional effects of the injury
have subsided.
Secondary axis (Opt.), any line which passes through the
optical center of a lens but not through the centers of
curvature, or, in the case of a mirror, which passes
through the center of curvature but not through the center
of the mirror.
Secondary battery. (Elec.) See under Battery, n., 4.
Secondary circle (Geom. & Astron.), a great circle that
passes through the poles of another great circle and is
therefore perpendicular to its plane.
Secondary circuit, Secondary coil (Elec.), a circuit or
coil in which a current is produced by the induction of a
current in a neighboring circuit or coil called the
primary circuit or coil.
Secondary color, a color formed by mixing any two primary
colors in equal proportions.
Secondary coverts (Zool.), the longer coverts which overlie
the basal part of the secondary quills of a bird. See
Illust. under Bird.
Secondary crystal (Min.), a crystal derived from one of the
primary forms.
Secondary current (Elec.), a momentary current induced in a
closed circuit by a current of electricity passing through
the same or a contiguous circuit at the beginning and also
at the end of the passage of the primary current.
Secondary evidence, that which is admitted upon failure to
obtain the primary or best evidence.
Secondary fever (Med.), a fever coming on in a disease
after the subsidence of the fever with which the disease
began, as the fever which attends the outbreak of the
eruption in smallpox.
Secondary hemorrhage (Med.), hemorrhage occuring from a
wounded blood vessel at some considerable time after the
original bleeding has ceased.
Secondary planet. (Astron.) See the Note under Planet.
Secondary qualities, those qualities of bodies which are
not inseparable from them as such, but are dependent for
their development and intensity on the organism of the
percipient, such as color, taste, odor, etc.
Secondary quills or Secondary remiges (Zool.), the quill
feathers arising from the forearm of a bird and forming a
row continuous with the primaries; -- called also
secondaries. See Illust. of Bird.
Secondary rocks or Secondary strata (Geol.), those lying
between the Primary, or Paleozoic, and Tertiary (see
Primary rocks, under Primary); -- later restricted to
strata of the Mesozoic age, and at present but little
used.
Secondary syphilis (Med.), the second stage of syphilis,
including the period from the first development of
constitutional symptoms to the time when the bones and the
internal organs become involved.
Secondary tint, any subdued tint, as gray.
Secondary union (Surg.), the union of wounds after
suppuration; union by the second intention.
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Syn: Second; second-rate; subordinate; inferior.
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