What's the difference between precedent and precursor?

Precedent


Definition:

  • (a.) Going before; anterior; preceding; antecedent; as, precedent services.
  • (n.) Something done or said that may serve as an example to authorize a subsequent act of the same kind; an authoritative example.
  • (n.) A preceding circumstance or condition; an antecedent; hence, a prognostic; a token; a sign.
  • (n.) A rough draught of a writing which precedes a finished copy.
  • (n.) A judicial decision which serves as a rule for future determinations in similar or analogous cases; an authority to be followed in courts of justice; forms of proceeding to be followed in similar cases.

Example Sentences:

  • (1) However, this deficit was observed only when the sample-place preceded but not when it followed the interpolated visits (second experiment).
  • (2) Surprisingly, the clonal elimination of V beta 6+ cells is preceded by marked expansion of these cells.
  • (3) Peaks in the sperm index were preceded by 6 days with peaks in the serum testosterone concentration.
  • (4) Local application of 8-OH-DPAT (0-5 micrograms) into the median raphe nucleus, facilitated male rat sexual behavior, as evidenced by a decrease in number of intromissions preceding ejaculation and in time to ejaculation.
  • (5) Comparison of developmental series of D. merriami and T. bottae revealed that the decline of the artery in the latter species is preceded by a greater degree of arterial coarctation, or narrowing, as it passes though the developing stapes.
  • (6) In addition to the 89 cases of sudden and unexpected death before the age of 50 (preceded by some modification of the patient's life style in 29 cases), 11 cases were symptomatic and 5 were transplanted with a good result.
  • (7) There is precedent in Islamic law for saving the life of the mother where there is a clear choice of allowing either the fetus or the mother to survive.
  • (8) In some animals, the response was marked vasodilation, whereas in others transient vasoconstriction preceded the vasodilation.
  • (9) When Zn injection was preceded by a Cd injection, induction as measured by MT-1 mRNA and MT concentrations were approximately additive in liver.
  • (10) The results indicated that 48% of the sample either regularly checked their own skin or had it checked by another person (such as a spouse), and 17% had been screened by a general practitioner in the preceding 12 months.
  • (11) TIA preceded intracerebral hemorrhage in 11% and brain infarction in 15-20%.
  • (12) In all cases foetal administration of glucocorticoid led to the onset of labour, and lambing, and in all animals the hormonal changes preceding parturition were indistinguishable (either qualitatively or quantitatively) from the changes observed in animals carrying intact lambs.
  • (13) In the improved group, the families reported that the gait abnormality preceded the dementia in 11 patients and occurred at the same time in five.
  • (14) This effect could be intensified by a preceding treatment of the animal with androgens.
  • (15) These neurons can be identified uniquely by 3H-thymidine exposure during the week preceding the neurogenesis of cortical layer 6.
  • (16) They were preceded by the publication of The Success and Failure of Picasso (1965) and Art and Revolution: Ernst Neizvestny and the Role of the Artist in the USSR (1969); in one, he made a hopeless mess of Picasso’s later career, though he was not alone in this; in the other, he elevated a brave dissident artist beyond his talents.
  • (17) A manual search, derived from the references of these papers, was performed to obtain relevant citations for the years preceding 1970.
  • (18) A traumatic factor in the aetiology of the AVM was also discussed, since the patient had had two preceding episodes of traffic accidents with cranial and lumbar injury.
  • (19) Neither was the intra-VMH infusion of MA effective if: (i) the rats were not primed with estrogen; (ii) the tips of the cannulae were outside the VMH; or (iii) it was preceded by an intra-VMH infusion of the alpha 1b-antagonist, chloroethylclonidine (CEC).
  • (20) The first is that the supposed exaggerated winter birthrate among process schizophrenics actually represents a reduction in spring-fall births caused by prenatal exposure to infectious diseases during the preceding winter--i.e., a high prenatal death rate in process preschizophrenic fetuses.

Precursor


Definition:

  • (n.) One who, or that which, precedes an event, and indicates its approach; a forerunner; a harbinger.

Example Sentences:

  • (1) After 4 to 6 hours of recirculation, accumulation of vasoactive amine, 5-hydroxytryptamine, its major metabolite, 5-hydroxyindole acetic acid, and its precursor amino acid, tryptophan were detected.
  • (2) Compound Z has the properties expected of an oxidized MPT precursor.
  • (3) Moreover in MIT-1, the size of the novel polypeptide was not that predicted of the precursor (44.9 kDa) but was about 39 kDa, the same size as the authentic GS gamma polypeptide in CYT-4.
  • (4) It is possible that the elements provide common precursor proteins that reach the secretory intermediate lobe cells through their dendritic branches.
  • (5) The present in vitro studies show that it is found as beta-endorphin in bovine pituitary slices incubated with radioactive amino acid precursor [35S]methionine.
  • (6) Our study suggests that a major part of the renal antimineralocorticoid activity of spironolactone may be attributable to minor sulfur-containing metabolites or their precursors having a high renal clearance that affords access to their site of activity via the renal tubular fluid.
  • (7) When an expression vector containing plasminogen cDNA is transfected into baby hamster kidney cells, the number of drug-resistant colonies as well as the levels of plasminogen secreted by those colonies is lower than observed in similar transfections of other protease precursor genes.
  • (8) These series were prepared by oxidation of the new hydroquinone precursors.
  • (9) Administration of one of the precursors of noradrenaline l-DOPA not only prevented the decrease in tissue noradrenaline content in myocardium, but restored completely its reserves, exhausted by electrostimulation of the aortic arch.
  • (10) By 3 d in the chick embryo, the first neurons detected by antibodies to Ng-CAM are located in the ventral neural tube; these precursors of motor neurons emit well-stained fibers to the periphery.
  • (11) From this proliferating layer, precursor cells migrate outwards to reach the developing neostriatum in a sequential fashion according to two gradients of histogenesis.
  • (12) If this is what 70s stoners were laughing at, it feels like they’ve already become acquiescent, passive parts of media-relayed consumer society; precursors of the cathode-ray-frazzled pop-culture exegetists of Tarantino and Kevin Smith in the 90s.
  • (13) Fiber may have a protective role because of its influence on estrogen metabolism and excretion or because of the endocrine effects of the lignans, a family of compounds formed in the intestine from fiber-associated precursors.
  • (14) Furthermore it is this small compartment that is preferentially radioactively labelled during short-term incubations with radioactively labelled precursors.
  • (15) One important consequence of the conservative mode of replication is that cellular enzymes never gain access to the reovirus genome but only to its ssRNA precursors.
  • (16) The results from rabbit experiments suggest that the 12S protein, probably represents a precursor of TG.
  • (17) In vitro import assays indicate that ATP12 protein is synthesized as a precursor approximately 3 kDa larger than the mature protein.
  • (18) Tritium-labeled ribonucleic acid precursors, including cytidine, uridine, and orotic acid, were injected into rats with dated pregnancies (14 to 21 days) and virgin rats.
  • (19) Pulse-chase experiments showed that the ornithine transcarbamylase precursor and the thiolase traveled from the cytosol to the mitochondria with half-lives of less than 5 min, whereas the three fusion proteins traveled with half-lives of 10-15 min.
  • (20) The results show that centrally administered serotonin, the serotonin precursor, 5-hydroxytryptophan administered with clorgyline, a selective MAO A inhibitor, quipazine, a serotonin receptor agonist, and fluoxetine, a selective inhibitor of neuronal re-uptake of serotonin, attenuated all paradigms of FIA and apomorphine induced potentiation of FIA.