(n.) Any young insect from the time that it hatches from the egg until it becomes a pupa, or chrysalis. During this time it usually molts several times, and may change its form or color each time. The larvae of many insects are much like the adults in form and habits, but have no trace of wings, the rudimentary wings appearing only in the pupa stage. In other groups of insects the larvae are totally unlike the parents in structure and habits, and are called caterpillars, grubs, maggots, etc.
(n.) The early, immature form of any animal when more or less of a metamorphosis takes place, before the assumption of the mature shape.
Example Sentences:
(1) Larvae from fresh water eggs, cultured in fresh water and 'normal' laboratory cultures reached 50% infectivity in 3-5 days, losing potential infectivity in 11-15 days post-hatching.
(2) After treatment of larvae of instar 1 at preimago stages about 77% of the insects died.
(3) A total of 3,532 females of various engorged weights was collected from all calves, resulting in a mean female tick yield of 1.78% based on the number of larvae used for all infestations.
(4) Similar concentrations of free ecdysteroids were recorded in adults and larvae, although the two life cycle stages differed in their ratio of ecdysone: 20-hydroxyecdysone.
(5) Larvae of both mutants also excrete 3H-3-hydroxykynurenine and 3H-kynurenine rapidly, which probably accounts for the normal levels of kynurenine during larval life.
(6) Guinea pigs exposed to 200 and 400 H. truncatum larvae elicited the greatest change in feeding efficiency during the fourth infestation.
(7) In cultures of medium ML-15 containing a feeder layer of Dog Sarcoma (DS) cells larvae successfully moulted and showed a small but significant increase in length.
(8) The test is based on the ability of larvae to freely migrate through selected mesh sizes of nylon sieves and the reduced ability of larvae to migrate after preincubation with, and in the presence of, substances that inhibit or reduce larval motility.
(9) This study provides evidence for a maternal yolk factor associated with increased tolerance and resistance of larvae to copper.
(10) Human activity not only increases risk, but influences control by killing mosquito larvae, killing adult mosquitos or preventing mosquitos from feeding.
(11) Infected ticks were reared from larvae feeding on each of 11 rabbits taken from the same site.
(12) Histopathology examination from the margin of the ulcerative area confirmed the diagnosis of basal cell carcinoma, which was infested secondarily with larvae of flies.
(13) Tolypocladium tundrense and T. terricola UV-irradiated conidia exhibited acute toxicity to Aedes aegypti larvae in concentrations of 5 x 10(5) and 5 x 10(6) ml-1, respectively.
(14) These products, as well as several synthetic intermediates, were evaluated for antifilarial activity against Molinema dessetae either in vivo in its natural host, the rodent Proechimys oris, or in vitro by a new test using cultures of the infective larvae.
(15) However, mosquitoes infected with more than 4 larvae became more active than uninfected mosquitoes 8 days after infection.
(16) Metabolism of carbaryl by the fat body is affected by the age of the larva, the pH of the incubation medium, and the concentration of magnesium chloride in the incubation medium.
(17) The mutant larvae are apparently normal, but they harbor serious defects in the organs containing proliferating cells of both somatic and germ line origins.
(18) Changes in haemolymph juvenile hormone (JH) concentrations of larvae of the southwestern corn borer, Diatraea grandiosella, were used to estimate the activity of the corpora allata.
(19) Statistical analysis has shown the following: a) the growth inhibition, which is especially distinct in autumn-spring generation, takes place in the Ist instar larvae 1.76-2.20 mm long inhabiting the walls of the nasal cavity and concha (their average body length at hatching is 1.08 plus or minus 0.004 mm); the inhibition is associated with interpopulation relations and apparently does not depend on the date of its beginning and can last from 6 to 7 months; c) after the growth resumption the development continues uninterruptedly up to the moulting; the inhibition is also possible at the beginning of the 2nd instar and then the development proceeds without any intervals up to the complete maturation of larvae.
(20) It is present throughout development and is as abundant in embryos as in larvae and adult flies.
Pluteus
Definition:
(n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.
Example Sentences:
(1) During subsequent development to the pluteus larva stage this network increases in overall morphological complexity and becomes regionally distinct.
(2) A fluoresceinated lineage tracer was injected into individual blastomeres of eight-cell sea urchin (Strongylocentrotus purpuratus) embryos, and the location of the progeny of each blastomere was determined in the fully developed pluteus.
(3) When sea urchin eggs were fertilized with 125IFC-labeled sperm, the radioactivity from the sperm was quantitatively transferred to the egg (at a ratio of one sperm equivalent per egg) and persisted in the embryo as it developed to the pluteus larval state (5 days at 12 degrees C).
(4) The association of these genes with ectoderm is based on their being specifically expressed, albeit at low levels, in the pluteus ectoderm, and their being suppressed when presumptive ectoderm is made to differentiate as endoderm in the case of the embryo treated with lithium.
(5) The sea urchin Heliocidaris tuberculata undergoes typical development, forming an echinoid pluteus larva, whereas H. erythrogramma undergoes direct development via a highly modified, nonfeeding larva.
(6) The lipid content of the organic fraction of the mineralized matrix recalls the spicules of Pluteus larva reported in an earlier study.
(7) Because the sea urchin embryo develops from an egg to a pluteus larva in the absence of growth, this stockpiling of SpS24 mRNA anticipates rather than accompanies the onset of growth, which does not begin until after feeding.
(8) Single strand tracer excess titrations of alpha- and beta-tubulin mRNA and RNA gel blot hybridizations indicate that tubulin mRNA remains at a constant 1.3 X 10(5) transcripts per embryo during cleavage stages, increases during ciliogenesis shortly before hatching (12 hr PF), declines until midgastrula (30-35 hr PF), and then gradually increases 3-fold to about 6 X 10(5) per pluteus larva (72 hr PF).
(9) Tissues that have the ultrastructural characteristics of nervous tissues are associated with ciliary and muscular elements of the pluteus larva of Strongylocentrotus purpuratus.
(10) Sizing on 1.5% agarose gel indicated that the length of the palindromic sequences at the early blastula stage was predominantly about 200 b. p., and at the pluteus stage 240 b. p. Sensitivity of the palindromic sequences to S1 nuclease digestion at the blastula and gastrula stages was different.
(11) However, when aphidicolin is added after the vegetal plate has thickened, development continues normally through pluteus formation, even though DNA synthesis is inhibited by greater than or equal to 90% and cell division has ceased.
(12) Paracentrotus lividus embryos were continuously labeled with P32 from hatching blastula to pluteus.
(13) The LvN 1.2-kb mRNA was first detectable by Northern blots at the mesenchyme blastula stage just prior to gastrulation and then accumulated approximately 15-fold from gastrulation to the pluteus stage.
(14) A few days before metamorphosis, the hyaline layer lining the vestibular invagination of the competent pluteus larva is replaced by a three-layered cuticle resembling that of the adult sea urchin.
(15) Using indirect immunofluorescence, we have localized a molecule which shares antigenic determinants with mammalian insulin in the unfertilized egg as well as in the gut of pluteus larva sea urchins.
(16) Taking advantage of the superior resolution of cellular CAT expression patterns using the antibody visualization method, we found for the first time that, in addition to the expression in aboral ectoderm, some cells in the ciliated band of the pluteus express CyIIIa .
(17) The message is first detectable by RNase protection assays around hatching blastula stage and accumulates through pluteus larva stage.
(18) CAT mRNA was detected by in situ hybridization in serial sections of pluteus stage embryos derived from the injected eggs.
(19) Fractionation of pluteus stage embryos demonstrates that the protein is localized primarily with cells that form the syncytium of primary mesenchyme that elaborates the larval endoskeleton; furthermore, immunofluorescence localizes the epitope to the periphery of the endoskeleton in situ.
(20) Chromatin fractions differing in their transcriptional activity were isolated by selective micrococcal nuclease digestion of nuclei from sea urchin embryos (Strongylocentrotus droebachiensis) at the gastrula and pluteus stage.