What's the difference between larva and nauplius?

Larva


Definition:

  • (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.

Nauplius


Definition:

  • (n.) A crustacean larva having three pairs of locomotive organs (corresponding to the antennules, antennae, and mandibles), a median eye, and little or no segmentation of the body.

Example Sentences:

  • (1) At this time development resumes, culminating in the hatching of free swimming nauplius larvae.
  • (2) At the nauplius 1 stage (24 hr) the enzyme appears in the brain and epidermal regions, as well as in mesenchymal cells, with weaker staining in the salt gland.
  • (3) Eggs and the earliest hatched stages, nauplius I-III were most sensitive to methoprene, with little mortality seen in the later stages.
  • (4) Dormant encysted embryos can be cultured readily in the laboratory to provide large quantities of free-swimming nauplius larvae.
  • (5) The archenteron was composed of presumptive naupliar mesoderm and the blastopore was located at the site of the future anus of the nauplius larva.
  • (6) Furthermore, when crude nuclear pellets from encysted gastrulae and developing nauplius larvae were mixed prior to sonication, subsequent solubilization of proteins from the mixture did not yield RNA polymerase activity; sonication of the pellet from nauplii alone resulted in the solubilization of large quantities of RNA polymerases I and II as we have previously found [1].
  • (7) The number of mitochondria in Artemia has been estimated at 1500 per diploid genome in the cyst and 4000 in the nauplius.
  • (8) After further development (nauplius 2 stage, 36 hr) stronger staining appears in the salt gland and in the epidermal region.
  • (9) The osmoregulation of the nauplius of the brine shrimp, Artemia salina, was investigated using micropuncture and microanalytical techniques.
  • (10) Relative levels of mRNA coding for eL12, eL12' and elongation factor 1 alpha were determined during the development of Artemia from a dormant cyst to a nauplius.
  • (11) Haemoglobin II, which is the first to be induced, soon after hatching of nauplius larvae, persists generally throughout the whole adult life.
  • (12) These studies demonstrate that the nauplius of A. salina has the ability to osmoregulate not only against high environmental salinities but also against low salinities approaching those of freshwater.
  • (13) Translation of Artemia cyst or nauplius poly(A)-rich mRNA in wheat-germ extracts was found to be inhibited by 7-methylguanosine 5'-monophosphate, a chemical analog of the cap, as well as by snythetic caps such as m7G5'ppp5'Gm.
  • (14) values calculated for nauplius survival is 2.3 for 645 MeV protons and 1.5 for 9.2 GeV protons.
  • (15) At the nauplius 3 stage (48 hr) the enzyme appears in the midgut mucosa.
  • (16) There was no significant difference between the cyst and nauplius ribosomes.
  • (17) It is clear from these studies that the lobster nauplius molts at approximately 12% embryonic development (E12%) into a metanauplius, which subsequently undergoes a complete molt cycle within the egg.
  • (18) Larval shrimp Penaeus paulensis showed a tendency to decrease in ammonia tolerance as the larva metamorphosed from nauplius to postlarvae stage.
  • (19) Two low-molecular-weight proteins prominent in the cyst disappeared almost completely in the nauplius stage, whereas the proportion of actin increased 3-fold.
  • (20) c)The adult contained three distinct haemoglobins (haemoglobins I, II and III) in a quantitative ratio of 1:6:3, respectively, and these haemoglobins were not detected in nauplius.

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