nifn.

Brit.

/nɪf/, U.S.

/nɪf/

Origin: Formed within English, as an acronym. Etymon: English nitrogen fixation.

Etymology: Acronym < the initial letters of nitrogen fixation.

Genetics.

Usually italicized. More fully nif gene. (A symbol for) a gene which encodes nitrogenase or other proteins required for bacterial nitrogen fixation. Frequently with distinguishing following capital, denoting individual genes.

ΚΠ

1971 S. Streicher et al. in Proc. National Acad. Sci. U.S.A. 68 1177/1 These nif genes are located on the genetic linkage map of Klebsiella near the his operon.

1986 Jrnl. Biol. Chem. 261 772 The simplest explanation for these observations is that nifH codes for the peptide of the Fe protein, while nifM acts to convert this nifH peptide to the functioning Fe protein of nitrogenase.

1993 Molecular Microbiol. 10 123/2 Because the process of nitrogen fixation is energy-intensive and sensitive to oxygen, nif gene expression is controlled by fixed nitrogen and oxygen levels.

1997 Gene 194 235 A second flavodoxin gene, distinct from the nifF gene encoding nitrogenase flavodoxin, has been isolated from Klebsiella pneumoniae.

This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022).

† nifconj.¹

Forms: Middle English nif, Middle English nyf.

Origin: Formed within English, by compounding. Etymons: ne adv.¹, if conj.

Etymology: < ne adv.¹ + if conj.

Obsolete. rare.

1. If not, unless.

ΚΠ

c1400 (?c1380) Cleanness (1920) 21 Nif he nere scoymus and skyg and non scaþe lovied, Hit were a mervayl to much, hit moȝt not felle.

c1400 (?c1390) Sir Gawain & Green Knight (1940) 1769 (MED) Gret perile bi-twene hem stod, Nif Mar[y]e of hir knyȝt [con] mynne.

c1450 (?a1400) Wars Alexander (Ashm.) 2102 Nyf my seniourie ne I myselfe nouthire, All þe werd myȝt a wedowe wele þan be callid.

a1500 (?a1400) Stanzaic Life of Christ (Harl. 3909) (1926) 1676 Ther of the aungel sone in hight repreuet truely he was, and sayde to sle hym he had tight, nyf the asse had ȝiuen hym place.

2. Nor.

ΚΠ

c1475 (a1400) Awntyrs Arthure (Taylor) in J. Robson Three Early Eng. Metrical Romances (1842) 5 (MED) Nauthyr of hyde, nyf of [v.r. ne on] heue, no hillyng hit had.

?a1500 (?a1425) Resurrection (Manchester) in R. M. Lumiansky & D. Mills Chester Myst. Cycle (1974) I. App. 491 (MED) In this cytty..was none so sterne nyfe so stowte that durst once looke up.

This entry has been updated (OED Third Edition, September 2003; most recently modified version published online December 2021).

nifconj.²

Brit.

/nɪf/, U.S.

/nɪf/

Origin: Formed within English, by clipping or shortening. Etymon: English an if.

Etymology: Reduced form of an if (see an conj. 2).

Chiefly English regional (south-western). Now rare.

= if conj.

ΚΠ

1746 Exmoor Scolding in Gentleman's Mag. July 354/2 Nif tha com'st athert Rager Hosegood, tha wut lackee an over-while avore tha com'st.

1778 H. Brooke Contending Brothers iv. iii. 164 Fair and saaftly goes far, nif dthe day is long enuff, Miss Charlotte!

1825 J. Jennings Observ. Dial. W. Eng. 130 I da thenk, nif I war a gennelman, that I'd vine better sport than huntin.

1885 Reports Provinc. 98 Nif so be I shouldn't be able for to come.

1888 F. T. Elworthy W. Somerset Word-bk. (at cited word) Nif th'old mare didn put along fit to tear up the very stone.

1963 W. C. Williams Paterson (new ed.) iii. 138 Then Golding's ‘Ovid’ is in Everyman's lib. & nif you want a readin list ask papa.

This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022).

> as lemmas

NIF

NIF n. Immunology neutrophil immobilizing factor, neutrophil inhibitory factor.

ΚΠ

1973 Jrnl. Immunol. 111 938/1 A neutrophil-immobilizing factor (NIF) has been derived from..leukocytes.

1983 Immunol. 48 81/2 Each of the two NIFs was recovered as a single peak of optical density... The amino-terminated amino acid sequence..of each of the purified NIF polypeptides was determined.

1994 New Scientist 16 Apr. 10/2 The compound called neutrophil inhibitory factor (NIF), blocks the action of neutrophils, the white blood cells which trigger the immune system at sites of infection or tissue damage.

extracted from Nn.

NIF

NIF n. Pharmacology nifedipine.

ΚΠ

1982 Jrnl. Cardiovascular Pharmacol. 4 Suppl. 3. 325/1 Nifedipine (NIF) and verapamil (VER) are calcium antagonist drugs.

1991 Amer. Jrnl. Kidney Dis. 17 565/2 Low concentrations of the calcium channel blocker NIF..were continuously infused.

extracted from Nn.

n.1971

conj.¹c1400

conj.²1746

as lemmas

单词	nif
释义	nifn. Brit. /nɪf/, U.S. /nɪf/ Origin: Formed within English, as an acronym. Etymon: English nitrogen fixation. Etymology: Acronym < the initial letters of nitrogen fixation. Genetics. Usually italicized. More fully nif gene. (A symbol for) a gene which encodes nitrogenase or other proteins required for bacterial nitrogen fixation. Frequently with distinguishing following capital, denoting individual genes. ΚΠ 1971 S. Streicher et al. in Proc. National Acad. Sci. U.S.A. 68 1177/1 These nif genes are located on the genetic linkage map of Klebsiella near the his operon. 1986 Jrnl. Biol. Chem. 261 772 The simplest explanation for these observations is that nifH codes for the peptide of the Fe protein, while nifM acts to convert this nifH peptide to the functioning Fe protein of nitrogenase. 1993 Molecular Microbiol. 10 123/2 Because the process of nitrogen fixation is energy-intensive and sensitive to oxygen, nif gene expression is controlled by fixed nitrogen and oxygen levels. 1997 Gene 194 235 A second flavodoxin gene, distinct from the nifF gene encoding nitrogenase flavodoxin, has been isolated from Klebsiella pneumoniae. This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022). † nifconj.¹ Forms: Middle English nif, Middle English nyf. Origin: Formed within English, by compounding. Etymons: ne adv.¹, if conj. Etymology: < ne adv.¹ + if conj. Obsolete. rare. 1. If not, unless. ΚΠ c1400 (?c1380) Cleanness (1920) 21 Nif he nere scoymus and skyg and non scaþe lovied, Hit were a mervayl to much, hit moȝt not felle. c1400 (?c1390) Sir Gawain & Green Knight (1940) 1769 (MED) Gret perile bi-twene hem stod, Nif Mar[y]e of hir knyȝt [con] mynne. c1450 (?a1400) Wars Alexander (Ashm.) 2102 Nyf my seniourie ne I myselfe nouthire, All þe werd myȝt a wedowe wele þan be callid. a1500 (?a1400) Stanzaic Life of Christ (Harl. 3909) (1926) 1676 Ther of the aungel sone in hight repreuet truely he was, and sayde to sle hym he had tight, nyf the asse had ȝiuen hym place. 2. Nor. ΚΠ c1475 (a1400) Awntyrs Arthure (Taylor) in J. Robson Three Early Eng. Metrical Romances (1842) 5 (MED) Nauthyr of hyde, nyf of [v.r. ne on] heue, no hillyng hit had. ?a1500 (?a1425) Resurrection (Manchester) in R. M. Lumiansky & D. Mills Chester Myst. Cycle (1974) I. App. 491 (MED) In this cytty..was none so sterne nyfe so stowte that durst once looke up. This entry has been updated (OED Third Edition, September 2003; most recently modified version published online December 2021). nifconj.² Brit. /nɪf/, U.S. /nɪf/ Origin: Formed within English, by clipping or shortening. Etymon: English an if. Etymology: Reduced form of an if (see an conj. 2). Chiefly English regional (south-western). Now rare. = if conj. ΚΠ 1746 Exmoor Scolding in Gentleman's Mag. July 354/2 Nif tha com'st athert Rager Hosegood, tha wut lackee an over-while avore tha com'st. 1778 H. Brooke Contending Brothers iv. iii. 164 Fair and saaftly goes far, nif dthe day is long enuff, Miss Charlotte! 1825 J. Jennings Observ. Dial. W. Eng. 130 I da thenk, nif I war a gennelman, that I'd vine better sport than huntin. 1885 Reports Provinc. 98 Nif so be I shouldn't be able for to come. 1888 F. T. Elworthy W. Somerset Word-bk. (at cited word) Nif th'old mare didn put along fit to tear up the very stone. 1963 W. C. Williams Paterson (new ed.) iii. 138 Then Golding's ‘Ovid’ is in Everyman's lib. & nif you want a readin list ask papa. This is a new entry (OED Third Edition, September 2003; most recently modified version published online March 2022). > as lemmas NIF NIF n. Immunology neutrophil immobilizing factor, neutrophil inhibitory factor. ΚΠ 1973 Jrnl. Immunol. 111 938/1 A neutrophil-immobilizing factor (NIF) has been derived from..leukocytes. 1983 Immunol. 48 81/2 Each of the two NIFs was recovered as a single peak of optical density... The amino-terminated amino acid sequence..of each of the purified NIF polypeptides was determined. 1994 New Scientist 16 Apr. 10/2 The compound called neutrophil inhibitory factor (NIF), blocks the action of neutrophils, the white blood cells which trigger the immune system at sites of infection or tissue damage. extracted from Nn. NIF NIF n. Pharmacology nifedipine. ΚΠ 1982 Jrnl. Cardiovascular Pharmacol. 4 Suppl. 3. 325/1 Nifedipine (NIF) and verapamil (VER) are calcium antagonist drugs. 1991 Amer. Jrnl. Kidney Dis. 17 565/2 Low concentrations of the calcium channel blocker NIF..were continuously infused. extracted from Nn. < n.1971conj.¹c1400conj.²1746 as lemmas
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nifn.

† nifconj.1

nifconj.2

> as lemmas

† nifconj.¹

nifconj.²