(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.
Redia
Definition:
(n.) A kind of larva, or nurse, which is prroduced within the sporocyst of certain trematodes by asexual generation. It in turn produces, in the same way, either another generation of rediae, or else cercariae within its own body. Called also proscolex, and nurse. See Illustration in Appendix.
Example Sentences:
(1) The authors conclude that development of the first and second redial generations occurs during the same period, and that the forms of the first cohort of the second generation are produced from the first redia of the first generation which originated from the sporocyst.
(2) This seems to suggest that the rediae of this species are incompatible with other trematodes in the snail.
(3) The salient features of the adults of this lung fluke, its first and second intermediate hosts, rediae, cercariae, metacercariae and the results of feeding experiments on laboratory animals (albino rats, cats, and dogs) are described and compared with the relevant species of lung flukes already known.
(4) During the period from September 1985 to March 1988, the freshwater snails, Semisulcospira libertina, were collected from 4 mountain rivers in Ayama County of Mie Prefecture, which is known as a heavily infected locality with Paragonimus westermani (Kerbert, 1878) Braun, 1899, and were examined for cercariae and rediae of this lung fluke.
(5) The redia lacked procrusculi and had a short intestine which was slightly longer than the pharynx.
(6) is experimentally obtained from cercariae, born into rediae and naturally produced by the snail Gabbia neumanni (Martens, 1898).
(7) The following developmental stages are described: mother and daughter rediae, cercaria, metacercaria, and adult.
(8) Miracidia derived from single worms were as capable of infecting laboratory-reared Biomphalaria glabrata and producing patent rediae as were those from multiple infections.
(9) Echinostomatids were dominant; species without rediae in their life cycles were subordinates.
(10) The significance of multiciliate sensory endings in rediae and their similarity to multiciliate sensory endings in miracidia and cercariae is discussed.
(11) Research on the transmission of Hemiurid Trematode Halipegus ovocaudatus in experimental and natural conditions demonstrates the following: --the miracidium grows into a sporocyst producing rediae in the Mollusc Planorbis planorbis; -- the cystophorous cercariae become mesocercariae in the hemocoele of Copepodes or finally Ostracodes when swallowed; -- the mesocercariae become matacercariae in the mesenteron of larval Odonates (Zygoptera and Anisoptera) when these larvae swallow the Crustacea; -- the metacercariae become become adults in the Amphibial Rana ridibundal perezi which feeds on dragonflies.
(12) The number of rediae of generations 2 and 3 is correlated with bodily volume of the snail host.
(13) The release of cercariae from 3rd-generation rediae began around the 75th day, and from 4th-generation rediae after 85 days.
(14) It was ascertained that the redia uses all three paths of release of energy i.e.
(15) The size of rediae developed in the infected Hippeutis sp.
(16) General features observed on the surface of Philophthalmus megalurus and Philophthalmus gralli rediae include 2 rounded ambulatory buds, a tapered tail, a slitlike birth pore, and an oral opening surrounded by uniciliate sensory receptors.
(17) The ultrastructure of the daughter redia of Echinostoma liei inside their host Biomphalaria alexandrina is described.
(18) The percentage of snails with intraventricular sporocysts that also developed hemocyte encapsulation responses generally increased with snail size, whereas the number of snails that ultimately became heavily parasitized with large numbers of daughter rediae decreased significantly with snail size.
(19) Rediae of 2 size groups were present in the digestive gland of the brackish-water snail, Cerithidea californica.
(20) It appeared that rediae and cercariae tended to concentrate the label in the foot, the mantle and the digestive gland.