Results 71 to 80 of about 22,021 (216)

Molecular Targets of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) within the Zebrafish Ovary: Insights into TCDD-induced Endocrine Disruption and Reproductive Toxicity [PDF]

open access: yes, 2008
TCDD is a reproductive toxicant and endocrine disruptor, yet the mechanisms by which it causes these reproductive alterations are not fully understood.
Carvan, Michael J., III   +5 more
core   +1 more source

Issues arising when interpreting results from an in vitro assay for estrogenic activity [PDF]

open access: yes, 2000
Concern about possible adverse effects caused by the inadvertent exposure of humans and wildlife to endocrine-active chemicals, has led some countries to develop an in vivo–in vitro screening program for endocrine effects.
Beresford, NA   +3 more
core   +1 more source

From flower buds to bolls: how cotton reproductive structures shape boll weevil development, reproduction and survival

open access: yesPest Management Science, EarlyView.
Female boll weevils feeding on flower buds promote reproduction regardless of their immature diet, whereas boll feeding increases lipid reserves and lifespan, revealing a nutrition‐driven trade‐off that sustains survival and reproduction in tropical boll weevil populations.
Roberta Ramos Coelho   +5 more
wiley   +1 more source

Ecdysteroids, juvenile hormone and vitellogenesis in the cockroach Leucophaea maderae

open access: yesJournal of Insect Science, 2002
Topical application of 400µg of the juvenile hormone analog, methoprene, to females of the penultimate instar of Leucophaea maderae failed to induce vitellogenin synthesis.
Franz Engelmann
doaj  

Phylogenetic Relationships of Russian Far-East Apis cerana with Other North Asian Populations

open access: yesJournal of Apicultural Science, 2019
Apis cerana Fabricius, 1793 is the eastern honeybee species distributed throughout Asia from the tropical climate in the southern part to the temperate climate in the northern part.
Ilyasov Rustem A.   +7 more
doaj   +1 more source

Regulatory Mechanisms of Vitellogenesis in Insects

open access: yesFrontiers in Cell and Developmental Biology, 2021
Vitellogenesis is pre-requisite to insect egg production and embryonic development after oviposition. During insect vitellogenesis, the yolk protein precursor vitellogenin (Vg) is mainly synthesized in the fat body, transported by the hemolymph through ...
Zhongxia Wu   +3 more
doaj   +1 more source

Honeybee rebel workers invest less in risky foraging than normal workers [PDF]

open access: yes, 2018
In eusocial insect colonies, workers have individual preferences for performing particular tasks. Previous research suggests that these preferences might be associated with worker reproductive potential; however, different studies have yielded ...
Kuszewska, Karolina   +2 more
core   +1 more source

Long‐term impact of exposure to Royal Guard, a pyriproxyfen‐based bed net, on pyrethroid‐resistant malaria vectors from Cameroon using DNA‐based metabolic resistance markers

open access: yesPest Management Science, Volume 81, Issue 4, Page 2165-2180, April 2025.
We used recently detected P450 DNA‐based markers of pyrethroid resistance in both Anopheles funestus and Anopheles gambiae to demonstrate that although pyrethroid‐resistant mosquitoes have higher ability to survive and live longer after exposure to Royal Guard, this net significantly affects their lifespan, blood feeding ability and interestingly ...
Emilie S Ngongang‐Yipmo   +8 more
wiley   +1 more source

VITELLOGENIN AND GLUCOSE CONCENTRATIONS IN THE HEMOLYMPH OF WILD AND CONFINED CRAYFISH (AUSTROPOTAMOBIUS PALLIPES LEREBOULLET 1858)

open access: yesKnowledge and Management of Aquatic Ecosystems, 2003
The white-clawed crayfish (Austropotamobius pallipes) is a native species in the Friuli Venezia Giulia region of North-Eastern Italy. This species is under threat because of habitat modifications and water pollution.
D’AGARO E.   +2 more
doaj   +1 more source

Involvement of Two Paralogous Methoprene-Tolerant Genes in the Regulation of Vitellogenin and Vitellogenin Receptor Expression in the Rice Stem Borer, Chilo suppressalis

open access: yesFrontiers in Genetics, 2020
Besides the function of preventing metamorphosis in insects, the juvenile hormone (JH) plays a role in female reproduction; however, the underlying mechanism is largely unknown.
Lijun Miao   +9 more
doaj   +1 more source

Home - About - Disclaimer - Privacy