leuco-
pref.（前缀）
pref.（前缀）
- Variant of leuko-
leuko-的变体
leuco- or leuko- or (before a vowel) leuc- or (before a vowel) leuk-
combining form
white or lacking colour
⇒
leucocyte
⇒
leucorrhoea
⇒
leukaemia
Origin
from Greek leukos whiteleuco-
1
variant of leuko-.
Also, especially before a vowel, leuc-.
Related Words
- leuc-
- leucite
- leuco base
- leucocratic
- leucoderma
- leucoplast
leuco-a word element meaning 'white'.
Also, leuko-; ◆ (before vowels), leuc-. [Greek leuko-, combining form of leukos]
leuco-
⇨ see leuc-
⇨ see leuc-
leuco-
（亦作 leuko- ）
combining form
1.
- white表示“白（的）”：
-
leucoma.
2.
- representing
LEUCOCYTE .同LEUCOCUTE .
词源
from Greek leukos 'white'.
1863 Fownes' Chem. 673The action of sulphide of ammonium upon rosaniline gives rise to a base *leucaniline which contains two additional equivalents of hydrogen.
1935 G. M. & R. Robinson in Jrnl. Chem. Soc. 745Probably class (b) consists of relatively simple glycosides or diglycosides, whereas members of class (c) are sugar-free and should be regarded as *leuco-anthocyanidins. [ of leuco-anthocyanins]
1962 J. Clark-Lewis in T. A. Geissman Chem. Flavonoid Compounds viii. 218Choice between the terms leucoanthocyanin and leucoanthocyanidin seems so far to have rested on the preference of individual authors, but there are sound reasons for using leucoanthocyanidin for the sugar-free molecules, and as the general term, and for reserving the term leucoanthocyanin for leucoanthocyanidin glycosides. The terminations thus have the same significance as in anthocyanin and anthocyanidin. All the compounds of this class and known constitution so far discovered in nature are leucoanthocyanidins, i.e. do not contain sugar residues.
1967 J. B. Harborne Compar. Biochem. Flavonoids ix. 302Leuco⁓anthocyanidins (or condensed tannins) can be classified into three groups: (1) low molecular weight substances, which are probably dimers formed by linkage of a flavan-3,4-diol with a catechin.., (2) soluble oligomers, containing 4 to 8 flavan units, and (3) insoluble polymers (flavolans) of 10 or more units.
1967 New Scientist 4 May 270/3 The culprits that cause colour change in African mahogany are katechin and leucoanthocyanidin.
1920 O. Rosenheim in Biochem. Jrnl. XIV. 185In the young leaf, however, the pseudo⁓base does not occur in the free state, but in combination with either a carbohydrate or possibly another complex. For this combination the general name *leuco-anthocyanin is proposed.
1960 L. H. Meyer FoodChem. vii. 251Catechins and leucoanthocyanins are present in the tissues of those woody plants studied such as apples, peaches, grapes, almonds, and some pears, while they are absent in herbaceous plants.
1962 T. Swain in T. A. Geissman Chem. Flavonoid Compounds xvi. 536It has been presumed by many workers that the term leucoanthocyanin, like the term catechin, refers to the monomeric C15 molecule.
1971 Ann. deTechnol. Agricole XX. 32Different methods for the dosage of leucoanthocyanins of white wines have been compared.
1901 Brit. Med. Jrnl. 29 June 1606A partial exhaustion of the *leucoblastic function of the bone marrow.
1742 T. Gray Let. 27 MayWks. 1884 II. 113Mine..is a white Melancholy, or rather *Leucocholy, for the most part; which, though it seldom laughs or dances, nor ever amounts to what one calls Joy or Pleasure, yet is a good easy sort of a state.
1894 Jrnl. R.Microsc. Soc. 732The virulent cocci ..secrete a special substance. This, which causes the death of the leucocytes, is termed ‘substance leucocide’ or *leucocidine. [ of Staphylococcus]
1909 J. G. Adami Princ. Path. I. iii. viii. 489The leukotoxins are also known as leukocidins.
1970 Ambrose & Easty CellBiol. xiv. 470Some bacteria not only resist phagocytosis but produce substances, known as leucocidins, which kill phagocytes.
1909 A. Harker Nat. Hist. Igneous Rocks v. 112The former a melanocratic type..and the latter [ sc. camptonite, is] *leucocratic. [ sc. mænaite]
1954 H. Williams et al.Petrogr. ii. 33In Johannsen's classification four rock classes are distinguished according to the volume-content of dark minerals, the limits being placed at 5, 50, and 95 percent. Shand also distinguishes four classes, but with different limits, as follows: leucocratic rocks, with less than 30 percent mafic minerals; mesocratic rocks, with 30–60 percent; melanocratic rocks, with 60–90 percent; and hypermelanic rocks, with more than 90 percent mafic minerals.
1965 G. J. Williams Econ. Geol. N.Z. xiv. 216/1The Separation Point granite..is a massive white leucocratic soda-granite.
1829 Nat. Philos. , Polaris. Light ix. 34 (U.K. S.)In other specimens of apophyllite, which Mr. Herschel calls *leucocyclite, from the rings being white and black.
1924 A. C. Haddon Races of Man (ed. 2) 13Occasionally in *leucoderms, sometimes in Negroes, and as a rule in Mongoloid peoples, a fold of skin..covers the inner angle of the eye.
Ibid. 84The western steppe lands seem to have been the original home of fair (leucoderm) dolichocephals.
1935 Huxley & Haddon We Europeans iv. 115A broad and convenient classification of skin-colour is as follows: (1) Leucoderms, or white-skinned (Caucasian) peoples; (2) Xanthoderms, or yellow-skinned peoples; (3) Melanoderms, or black-skinned peoples.
1884 Max Müller in 19thCent. June 1017A semi-human progenitor, suffering, it may be, from leprosy or *leucoderma.
1888 Syd. Soc. Lex. ,*Leucodermia, see Leukoderma.
1908 Practitioner Aug. 349 They are an example of excess of pigment in the skin, a condition known as hyperchromasia, in contradistinction to achromasia, or leucodermia, in which there is a deficiency of pigment in the skin. [ sc. freckles]
1926 H. H. Wilder Pedigree of Human Race vi. 348Members of the *Leucodermic race in Europe or America.
1898 Allbutt's Syst. Med. V. 418Any number of leucocytes below the arbitrary limit of 6000 will constitute a hypoleucocytosis, or *leucopenia as the condition is also named. [ per cubic millimetre of blood]
1961 R. D. Baker Essent. Path. ii. 18In some inflammations the total white blood cell count is decreased (leukopenia).
1964 W. G. Smith Allergy & Tissue Metabolism ii. 16Marked reductions in the number of leucocytes (leukopenia) and platelets (thrombocytopenia) circulating in the blood were described.
1898 Allbutt's Syst. Med. 420He was able to distinguish..a *leucopenic phase, or hypoleucytosis, during which the number of hæmic leucocytes falls . [ etc.]
1924 L. Hogben Pigmentary EffectorSyst. ii. 24In the skin of the Chameleon there are present, immediately below the epidermis, cells charged with yellow pigment variously described as guanophores (Schmidt), *leukophores or ochrophores (Keller), iridocytes (Pouchet), or interference cells (Brucke).
1963 M. Fingerman Control of Chromatophores i. 4When the guanine consists of fine granules that can migrate the term leucophore is usually employed.
1932 E. S. Simpson in Jrnl. R.Soc. W.Austral. XVIII. 71No previously described mineral approaches this in composition except minervite, a potassium aluminium phosphate, from which it differs in possessing a much greater basicity... It appears therefore to be a new species for which the name *Leucophosphite is suggested.
1963 Prof. Papers U.S. Geol. SurveyNo. 475–C. 103/2Leucophosphite and gypsum represent in large part only a recombination of the elements already present in the phosphatized wood when uplift of the enclosing Moreno Formation exposed it to weathering.
1972 Amer. Mineralogist LVII. 397Leucophosphite, K2 .2H2O, possesses an atomic arrangement based on a discrete octahedral tetramer. [ Fe3+4(OH)2(H2O)2(PO4)4]
1865 Watts Dict. Chem. III. 584*Leucophyll.
1885–8 Fagge & Pye-Smith Princ. Med. (ed. 2) I. 124A similar affection of the tongue often follows *leucoplacia, or white syphilitic patches, at the end of several years.
1920 W. E. Masters Essent. Trop. Med. vi. 477Leucoplakia may also affect the penis, vulva and vagina.
1962 Lancet 1 Dec. 1170/2 Leucoplakia (or lichen sclerosus) diagnosed by the clinician on naked-eye appearances shows variable and non-specific histological features.
1962 Ibid. 8 Dec. 1228/2Here operating is undesirable, except in those few patients in whom leukoplakia develops as well.
1973 Daily Colonist (Victoria, B.C. ) 7 Sept. 2/1Leukoplakia is a thickening of the membrane of a mucous surface, commonly on the lip or in the mouth.
1908 Practitioner Sept. 354, I believe that if sufficient examinations were made in syphilitic patients..*leucoplakial patches would be found in the mucous membrane from time to time.
1923 Surg. Gynecol. &Obstetr. XXXVI. 189/1The leukoplakial conditions of the urinary tract have received relatively little attention.
1907 Arch. MiddlesexHosp. IX. (6thRep. CancerRes. Lab. ) 65Those *leucoplakic conditions of vulva, tongue, and lips which..often precede the development of squamous cell carcinoma.
1917 J. Bland-Sutton Tumours, Innocent & Malignant (ed. 6) xxx. 331In some patients an ulcer appears in a leucoplakic patch.
1962 Lancet 1 Dec. 1170/2 If all vulvas described as leucoplakic on clinical grounds are subjected to biopsy, approximately 5% are found to be cancerous at the outset.
Ibid. 8 Dec. 1228/2Changes in vulval skin..are very common... Among other features, they are often white, but this does not mean that they are precancerous or leukoplakic.
1886 Jrnl. R.Microsc. Soc. 640In the lower plants..the formation of *leucoplasts is a subsequent process, a transformation of the coloured into a colourless chromatophore.
1887,1902 Leucoplast . [ see chloroplast]
1964 Oceanogr. & MarineBiol. II. 199All species possess amyliferous leucoplasts as well as the ordinary green plastids. [ of the genus Caulerpa of green algae]
1885 Goodall Physiol. Bot. (1892) 43*Leucoplastids..are found in parts which are normally devoid of chlorophyll, such as tubers, rhizomes, etc.
1913 Dorland Med. Dict. (ed. 7) 512/2*Leukopoiesis, production of leukocytes.
1942 M. M. Wintrobe Clin. Hematol. i. 26Erythropoiesis in the spleen is at first more pronounced than leukopoiesis but it is short-lived.
1973 Woodliff & Herrmann Conc. Haematol. viii. 113Disorders of leucopoiesis are usually reflected by changes in the peripheral blood.
1913 Dorland Med. Dict. (ed. 7) 512/2*Leukopoietic, forming or producing leukocytes.
1927 A. Piney RecentAdv. Hæmatol. iii. 35Hyperplasias of a character similar to those occuring in the leucopoietic tissue may affect the erythropoietic one.
1973 Woodliff & Herrmann Conc. Haematol. viii. 113A progressive malignant proliferation of the leucopoietic tissues.
1927 Chem. Abstr. XXI. 224 (heading)*Leucopterin, the white wing pigment of cabbage butterflies (Pieris brassicae and P. napi).
1954 Sci. News XXXIV. 91The purines and pterines contribute a major source of colour to the wings of butterflies... These compounds are only present in small amounts representing in the case of white leucopterin of Pierid butterflies about 0·18 milligramme per specimen.
1883 Nature XXVII. 277 Professor Helmholtz's new instrument, called the *leukoscope.
1871 tr. Schellen's Spectr.Anal. lvi. 272For this envelope the name ‘*leucosphere’ has been proposed.
1937 V. Menkin in Proc. Soc. Exper. Biol. &Med. XXXVI. 167For the sake of convenience the name *leukotaxine is tentatively proposed for this active crystalline nitrogenous substance which is evidently released by injured tissue and is readily recovered in inflammatory exudates.
1947 New Biol. II. 135The most reasonable hypothesis is..that leucotaxine is released from the killed and damaged cells of the injured skin we are considering, and is mainly responsible for the escape of fluid from nearby undamaged capillaries.
1957 Amer. Jrnl. Physiol. CLXXXIX. 99 (caption)A preliminary intravenous injection of 25 mg of cortisone acetate was performed in the tested rabbit to inactivate the masking effect of any leukotaxine possibly present in the acid exudate to be injected.
1964 W. G. Smith Allergy & Tissue Metabolism iii. 39This material, which Menkin called leucotaxin, can upon injection into the skin induce increased capillary permeability and chemotactic attraction of polymorphs to the injection site.
1908 Practitioner Mar. 392 Roentgen-rays appear to lead to the production of veritable ‘*leucotoxins’. Normal leucocytes, exposed in vitro and in vivo to the action of such leucotoxins present in the serum of animals, which have been exposed to Roentgen-rays, undergo a specific disintegration.
1931 Biol. Abstr. V. 488/2The virulent streptococci do not possess in the same degree the power of leukotoxin production.
1956 Proc. Soc. Exper. Biol. &Med. XCIII. 493/2A leucotoxin develops in the blood of the rabbit in hemorrhagic shock, and..this leucotoxin severely impairs the antibacterial potential of the animal.
1886 E. Knecht tr. Benedikt'sChem. Coal-Tar Colours 79These compounds, called ‘leuco-bases’, are colourless and yield colourless salts with acids. By oxidation they are transformed..into the colour-bases, which differ from the ‘leuco-bases’ by containing one atom of oxygen.
1947 L. S. Pratt Chem. & PhysicsOrg. Pigments viii. 140The dyestuff is prepared by condensing o-chlorobenzaldehyde with dimethylaniline and then oxidizing the leuco base to the color base.
1958 J. R. Baker Princ. Biol. Microtechnique xvii. 309Schiff's reagent..is often regarded as a leucobase, but this is an error; for a leucobase becomes coloured on oxidation and could not possibly serve in Feulgen's reaction.
1971 E. Gurr Synthetic Dyes 108The leuco bases of triphenylmethane dyes ( e.g. crystal violet and malachite green) are extremely light sensitive.
1956 Nature 14 Jan. 92/2 Leuco-basic fuchsin is specific for deoxyribonucleic acid.
1970 Watsonia VIII. 23 Root tips..were..stained in leucobasic fuchsin.
1888 Jrnl. Chem. Soc. LIV. 493The anthraquinone-dyes yield leuco⁓compounds on reduction.
1906 Notices Proc. R.Inst. Gt. Brit. XVII. 107What we are pleased to call leucocompounds, are in the majority of cases by no means colourless. Indigo-white itself is not white but yellow in its alkaline solution which we call a vat. Other vat-dyes have leucocompounds which are even more strongly coloured.
1961 Cockett & Hilton Dyeing Cellulosic Fibres viii. 280All methods used in practice to apply vat dyes to cellulosic fibres involve, at some stage, the conversion of the insoluble vat dye to the soluble sodium salt of the so-called leuco compound of the dye.
1931 Trans. FaradaySoc. XXVII. 571The pure alcoholic leuco cyanide solution is very suitable for a laboratory method . [ of measuring ultra-violet light]
1965 J. Kosar Light-SensitiveSyst. viii. 370Aside from the photographic applications, light-sensitive leucocyanides are useful for detecting, measuring, and recording short wave ultraviolet light.
1954 Textile Terms & Definitions (Textile Inst. ) 24Leuco dye, a reduced form of dye from which the original dye may be regenerated by an oxidation process.
1973 J. F. Willems in R. J. Cox Proc. SymposiumPhotogr. ProcessingUniv. Sussex 95These leuco dyes are strong reducing agents, which in the adsorbed state on the silver halide grain start the development.
1959 Nature 15 Aug. 545/1 The production of a coloured dye by transformation of the leuco form.
1945 Chem. Abstr. XXXIX. 6288/1 (Index),Leuco⁓fuchsin.
1965 E. Gurr Rational Use DyesBiol. 94Solutions of reduced dyes, such as Schiff's reagent (leuco fuchsin), leuco acid fuchsin and leuco patent blue in distilled water, are oxidized on heating and consequently restored in colour.
1967 Jrnl. Med. Lab. Technol. XXIV. 48 (heading)Nitric acid leucofuchsin technique for myelinated nerves.
1960 Jrnl. Neuropath. &Exper. Neurol. XIX. 334A survey of the literature shows that there are apparently only 10 reported instances of pathologically verified cases of infantile metachromatic *leukodystrophy.
1984 Tighe & Davies Pathology (ed. 4) xxv. 245The leucodystrophies are abnormalities of myelin leading to deficient myelination.
1991 Lancet 21–8 Dec. 1603/1 We report here on our experience with this drug in the symptomatic treatment of spasticity due to metabolic diseases with leukodystrophy in six children.
1909 Cent. Dict. Suppl. ,*Leucoencephalitis, same as forage-poisoning.
1917 D. S. White Text-bk. Princ. &Pract. Vet. Med. iii. 125Mycotic gastro-enteritis (Silage poisoning. Forage poisoning... Falsely called ‘Cerebrospinal meningitis’. Leuko-encephalitis).
1928 Arch. Neurol. & Psychiatry XIX. 263Leuko-encephalitis periaxalis concentrica means a disease in the course of which the white matter of the brain is destroyed in concentric layers.
1950 J. G. Greenfield in Brain LXXIII. 150The name subacute sclerosing encephalitis therefore appears fully justified. Dr. van Bogaert's term ‘leuco-encephalitis’ emphasizes the characteristic damage to the white matter, but leaves out of account the cortical changes which are also important. Perhaps the term ‘Panencephalitis’ already adopted by Pette (1942) for forms which attack both grey and white matter could be usefully employed here, i.e. ‘Subacute sclerosing panencephalitis’.
1961 Lancet 16 Sept. 656/1 He illustrated also the biopsy findings in two instances of subacute sclerosing leucoencephalitis.
1977 Ibid. 7 May 1001/1One had a severe chronic leucoencephalitis.
1989 Jrnl. RoyalSoc. Med. LXXXII. 307/1Opportunistic infection in this series included toxoplasmosis, cytomegalovirus..encephalitis and progressive multifocal leukoencephalitis.
1963 Biol. Abstr. XLIV. 514/2Isolation of a basic polypeptide with a *leukotactic and permeation-promoting action.
1977 Lancet 15 Oct. 799/2 Leucocytes migrate in response to an increasing leucotactic (chemotactic) gradient in vitro and, most probably, in vivo.
1949 Amer. Jrnl. Path. XXV. 5There was no leukotaxis, in that none of the lesions showed significant numbers of polymorphonuclear leukocytes or other elements of suppurative inflammation.
1969 Ward & Schlegal in Lancet 16 Aug. 344/2We describe here a different type of leucocyte defect that involves chemotactic function (leucotaxis) of neutrophils.
1985 Agents & Actions XVI. 48/1 Amplification and perpetuation of the primary inflammatory response depends on leukocyte recruitment by leukotaxis.
ORIGIN: from Greek leukos white: see -o-
☞ leuco
leuco-
— see leuc-
— see leuc-
leuco-
Prefix
- white
- colourless
- biology Forms terms relating to leucocytes, such as leukemia, leukopenia, and others