Results 31 to 40 of about 13,138 (208)

Sex-change chemicals and their influence on the brain. [PDF]

open access: yes, 2001
The potential for man-made chemicals to mimic or antagonise natural hormones is a controversial issue, but one for which increasing amounts of evidence are being gathered worldwide.
Harris, CA
core   +3 more sources

DmCatD, a cathepsin D-like peptidase of the hematophagous insect Dipetalogaster maxima (Hemiptera: Reduviidae): Purification, bioinformatic analyses and the significance of its interaction with lipophorin in the internalization by developing oocytes [PDF]

open access: yes, 2018
DmCatD, a cathepsin D-like peptidase of the hematophagous insect Dipetalogaster maxima, is synthesized by the fat body and the ovary and functions as yolk protein precursor. Functionally, DmCatD is involved in vitellin proteolysis.
Arrese, Estela L.   +8 more
core   +1 more source

Ultrastructural study of oogenesis in Marphysa sanguinea (Annelida: Polychaeta: Eunicida) from the Lagoon of Tunis

open access: yesScientia Marina, 2014
Ultrastructural features of oogenesis of the iteroparous and long lived eunicid polychaete Marphysa sanguinea (Montagu, 1815) from the Lagoon of Tunis were studied using both light and transmission electron microscopy methods.
Monia Elbarhoumi   +3 more
doaj   +1 more source

Transcriptomic analysis reveals yolk accumulation mechanism from the hepatopancreas to ovary in the pacific white shrimp Litopenaeus vannamei

open access: yesFrontiers in Marine Science, 2022
The Pacific white shrimp Litopenaeus vannamei is an economically important penaeid species worldwide. Under farming conditions, the full ovarian maturation of L.
Zhi Li   +12 more
doaj   +1 more source

Reduced glutamine synthetase activity alters the fecundity of female Bactrocera dorsalis (Hendel) [PDF]

open access: yes, 2019
Glutamine synthetase (GS) is a key enzyme in glutamine synthesis and is associated with multiple physiological processes in insects, such as embryonic development, heat shock response, and fecundity regulation.
Smagghe, Guy   +5 more
core   +2 more sources

Histochemical characteristics of the vitellogenic oocytes of the bluefin tuna, Thunnus thynnus L.

open access: yesCiencias Marinas, 2002
 Very little information is available with respect to dynamic aspects of oocyte development and to yolk composition of tuna species. Since histological approaches can offer considerable information about the ovarian development of fish, and because ...
C Sarasquete   +7 more
doaj   +1 more source

Targeted gene expression profiling in European sea bass (Dicentrarchus labrax, L.) follicles from primary growth to late vitellogenesis [PDF]

open access: yes, 2011
7 páginas, 6 figuras, 1 tabla como material suplementario.A real-time PCR-based gene expression survey was performed on isolated European sea bass follicles from primary growth to late vitellogenesis. Expression levels of 18 transcripts with demonstrated
Behmenburg, Clemens   +3 more
core   +1 more source

Vitellogenesis of diphyllobothriidean cestodes (Platyhelminthes)

open access: yesComptes Rendus. Biologies, 2015
The recently erected cestode order Diphyllobothriidea is unique among all tapeworm orders in that its species infect all major groups of tetrapods, including man. In the present paper, the vitellogenesis of representatives of all three currently recognized families of this order was evaluated, based on ultrastructural (transmission
Aneta, Yoneva   +3 more
openaire   +2 more sources

Vitellogenesis in Manduca sexta [PDF]

open access: yesMemórias do Instituto Oswaldo Cruz, 1987
Eggs of Manduca sexta contain four well-characterized protein derived from hemolymph: vitellogenin and lipophorin (very high density lipoproteins); microvitellogenin, a 26,000 dalton female-specific protein lacking lipid and carbohydrate, and insecticyanin, a blue biliprotein composed of four identical 22,000 dalton subunits.
Kawooya, John K.   +2 more
openaire   +3 more sources

Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees [PDF]

open access: yes, 2018
International audienceChaetodactylus osmiae (Dufour, 1839) is a mite parasitizing the solitary bee - Osmia rufa L.- used as a commercial pollinator. In this study we present the anatomy of female and male reproductive systems of this species as well as ...
Rożej-Pabijan, Elżbieta   +1 more
core   +3 more sources

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