IN WHAT EMBRYONIC STAGE DO THE EGGS OF NEODIPRION ENTER THE WINTER DIAPAUSE?

1952 ◽  
Vol 30 (2) ◽  
pp. 99-108 ◽  
Author(s):  
Wolodymyr Brygider
Keyword(s):  
Embryonic Development ◽  
Early Embryonic Development ◽  
Embryonic Stage ◽  
Embryonic Structure

This paper deals with the early embryonic development of Neodiprion banksianae Roh., N. nanulus Schedl., and N. sertifer Geoff., up to the initiation of winter diapause. Methods of preparation are described and the course of development is traced and described with the aid of two text-figures and two plates. The three species were found to enter diapause at approximately the same stage, but some differences in the details of their embryonic structure were discovered.

WATER ABSORPTION BY THE EGGS OF CRICKETS

1959 ◽  
Vol 37 (4) ◽  
pp. 391-399 ◽  
Author(s):  
J. E. McFarlane ◽  
A. S. K. Ghouri ◽  
C. P. Kennard
Keyword(s):  
Embryonic Development ◽  
Water Absorption ◽  
Acheta Domesticus ◽  
Early Embryonic Development ◽  
Embryonic Stage ◽  
Distilled Water ◽  
Rapid Loss ◽  
Incubation Periods ◽  
Maximal Absorption ◽  
Gryllodes Sigillatus

Absorption of water by the eggs of Acheta configuratus, Gryllodes sigillatus, and a Canadian and a Pakistani strain of Acheta domesticus takes place during early embryonic development. The amount of water absorbed varies from about 60 to 120% of the weight of newly laid eggs, depending on the species or strain. The time of absorption is generally earlier the more rapid is embryonic development, indicating that the embryonic stage during which water is absorbed is similar in all forms. Absorption is more rapid at 33 than at 28 °C. In all forms, a small but rapid loss in water occurs just after maximal absorption; this loss takes place also when the eggs are immersed in distilled water. The incubation periods of the four forms at various temperatures (28–38 °C) are presented.

Cytological observations on fertilization and early embryonic development in sea cucumber Apostichopus japonicus

2012 ◽  
Vol 36 (2) ◽  
pp. 272 ◽  
Author(s):  
Jie TAN ◽  
Hui-ling SUN ◽  
Fei GAO ◽  
Jing-ping YAN ◽  
Ying-hui DONG ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Sea Cucumber ◽  
Apostichopus Japonicus ◽  
Early Embryonic Development

Studies on the early embryonic development of artificially-bred Siberian sturgeon(Acipenser baeri)

2010 ◽  
Vol 34 (5) ◽  
pp. 777-785 ◽  
Author(s):  
Wei SONG ◽  
Jia-kun SONG ◽  
Chun-xin FAN ◽  
Tao ZHANG ◽  
Bin WANG
Keyword(s):  
Embryonic Development ◽  
Siberian Sturgeon ◽  
Early Embryonic Development ◽  
Acipenser Baeri

Low-level pyruvate inhibits early embryonic development and maternal mRNA clearance in mice

2021 ◽  
Author(s):  
Hengye Zhang ◽  
Ke Yan ◽  
Lumin Sui ◽  
Pan Li ◽  
Ya Du ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Early Embryonic Development ◽  
Low Level ◽  
Maternal Mrna

scholarly journals Decreased miR-149 expression in sperm is correlated with the quality of early embryonic development in conventional in vitro fertilization

2021 ◽  
Vol 101 ◽  
pp. 28-32
Author(s):  
Hongping Li ◽  
Lejun Li ◽  
Chuanping Lin ◽  
Minhao Hu ◽  
Xiaozhen Liu ◽  
...  
Keyword(s):  
In Vitro Fertilization ◽  
Embryonic Development ◽  
Early Embryonic Development ◽  
Vitro Fertilization

scholarly journals Unfolded protein response triggers differential apoptotic mechanisms in ovaries and early embryos exposed to maternal type 1 diabetes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aslı Okan ◽  
Necdet Demir ◽  
Berna Sozen
Keyword(s):  
Embryonic Development ◽  
Er Stress ◽  
Unfolded Protein Response ◽  
Molecular Mechanisms ◽  
Early Embryonic Development ◽  
Unfolded Protein ◽  
Caspase 12 ◽  
Early Embryos ◽  
Protein Response

AbstractDiabetes mellitus (DM) has profound effects on the female mammalian reproductive system, and early embryonic development, reducing female reproductive outcomes and inducing developmental programming in utero. However, the underlying cellular and molecular mechanisms remain poorly defined. Accumulating evidence implicates endoplasmic reticulum (ER)-stress with maternal DM associated pathophysiology. Yet the direct pathologies and causal events leading to ovarian dysfunction and altered early embryonic development have not been determined. Here, using an in vivo mouse model of Type 1 DM and in vitro hyperglycaemia-exposure, we demonstrate the activation of ER-stress within adult ovarian tissue and pre-implantation embryos. In diabetic ovaries, we show that the unfolded protein response (UPR) triggers an apoptotic cascade by the co-activation of Caspase 12 and Cleaved Caspase 3 transducers. Whereas DM-exposed early embryos display differential ER-associated responses; by activating Chop in within embryonic precursors and Caspase 12 within placental precursors. Our results offer new insights for understanding the pathological effects of DM on mammalian ovarian function and early embryo development, providing new evidence of its mechanistic link with ER-stress in mice.

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