(1) After treatment of larvae of instar 1 at preimago stages about 77% of the insects died.
(2) We detail the fatty acid compositions of last larval instars of two lepidopterans, Spodoptera frugiperda and Trichoplusia ni, two tissues from T. ni, a cell line derived from each species and the respective larval and cell culture media.
(3) 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.
(4) A growth-blocking peptide (GBP) with repressive activity against juvenile hormone (JH) esterase has been isolated from the last (6th) instar larval plasma of the armyworm Pseudaletia separata (Lepidoptera: Noctuidae) parasitized by the parasitoid wasp Apanteles kariyai (Hymenoptera: Braconidae) (1,2).
(5) There are 4-5 replication rounds in the 1st instar, 2-3 rounds in the 2nd instar, the 3rd and the 4th instars have 1-2 rounds each.
(6) A preliminary behavioral assessment of late 3rd instar larvae exposed to 1.42 ppm suggests that these plant extracts produce 80% mortality after only 4-5 h of contact.
(7) Male genital imaginal discs from old (late-third-instar) larvae of Drosophila that had been X-irradiated with appropriate doses developed into severely damaged adult genitalia when implanted into old larvae, but they developed into completely normal adult genitalia when transplanted into 2-day-younger larvae.
(8) Thus it appears that a cerebral neuropeptide specifically inhibiting JH I synthesis by the CA is present in Manduca on day 4 of the last larval instar, a time when the hemolymph titer of JH must drop to ensure the occurrence of pupal commitment.
(9) A sharp rise in trehalose level of haemolymph is observed towards the end of 4th instar accompanied with sudden fall of the sugar in fat body during the same period, but after moulting blood trehalose abruptly decreases.
(10) CC-CA of the late VIth instar (VI3) larvae were used for assessment of ATTH.
(11) Two boys with ophthalmomyiasis caused by the first instar larva of the reindeer warble fly Hypoderma tarandi are reported.
(12) Genetic information on 25 enzyme polymorphisms in Drosophila subobscura, the location of corresponding genes, and cytological and genetic maps of the chromosomes are presented, as well as photographic maps of the salivary gland chromosomes in the third instar larva and white-case early pupal stages.
(13) The allatectomy in the 4th instar larvae of Rhodnius prolixus stops moulting in 93 per cent of the cases.
(14) Dormant neuroblasts are found adjacent to the neuropil in late embryos and early first instar larvae.
(15) Second instar larvae which survive the molt exhibit a marked reduction in growth and eventually die as small second instar larvae.
(16) Extremely high concentrations of Vg were observed in the hemolymph of female nymphs (fourth instar), particularly engorged nymphs, treated with CyM (10 micrograms).
(17) Studies on the endurance to starvation by the immatures of T. splendens showed that the III instar larvae survived longer than the I and II instar larvae.
(18) The larval brain and proventriculus in awdb3 homozygous third-instar larvae appear to be vacuolated due to the accumulation of lipid droplets.
(19) mortality was high), while the nymphal instars showed an adverse effect on ecdysis and adults which emerged from the treated last nymphal instar were characterized by high mortality, abnormal behaviour and reduced fecundity and viability.
(20) In third instar larvae, high levels of mRNA could be observed in brain, imaginal discs, and in salivary glands.
Naiad
Definition:
(n.) A water nymph; one of the lower female divinities, fabled to preside over some body of fresh water, as a lake, river, brook, or fountain.
(n.) Any species of a tribe (Naiades) of freshwater bivalves, including Unio, Anodonta, and numerous allied genera; a river mussel.
(n.) One of a group of butterflies. See Nymph.
(n.) Any plant of the order Naiadaceae, such as eelgrass, pondweed, etc.
Example Sentences:
(1) The insects of the Order Odonata both naiads and adults may serve as the second intermediate host of some intestinal parasites in Thailand.
(2) Differences in oxygen consumption attributable to apparent specific dynamic action (SDA) were measured in relation to feeding level in the dragonfly naiad Somatochlora cingulata exposed to low pH and sublethal aluminum concentration plus low pH.
(3) Development of cercariae into infective metacercariae in dragon-fly naiads took 18 days.
(4) Metacercarial cysts were found in dragon-fly naiads (Tholymis tillarga and Tramea limbata) and aquatic bugs (Laccotrephes griseus and Ranatra elongata) collected from a stream.
(5) Overall, predation was maximal in young and mature rice, moderate in the submerged naiad vegetation, and minimal in areas of open water.
(6) However, no remains of mosquito larvae were detected in any of the specimens, even though mosquito larvae were observed as being continuously present in the pond sites where the naiad specimens were collected.
(7) Foregut contents of naiads of the damselfly species, Enallagma civile, collected from a permanent pond, were analyzed to determine the natural prey for immatures of this species.
(8) Corixid, cladoceran, ostracod and aquatic mite remains were found in some of the naiad specimens examined.
(9) The analyses revealed the naiads containing prey had fed predominantly on chironomid larvae.
(10) Although predator abundances differed in these studies, sometimes by an order of magnitude, the common predators colonized mesocosms in the following order: Triops, hydrophilid beetle larvae, dytiscid beetle larvae, mesoveliids, dragonfly and damselfly naiads, and notonectids.
(11) Based on relative abundance and correlation over time and space, zygopteran naiads were the most important predator at a stable foothill breeding site during 1985, and coleopteran larvae were the most important predator at ephemeral breeding sites sampled during 1986.