scholarly journals Variation in developmental rates is not linked to environmental unpredictability in annual killifishes

2021 ◽  
Author(s):  
Piotr K. Rowiński ◽  
Will Sowersby ◽  
Joacim Näslund ◽  
Simon Eckerström‐Liedholm ◽  
Karl Gotthard ◽  
...  
Keyword(s):  
Developmental Rates ◽  
Environmental Unpredictability

Differences between Populations in Embryonic Developmental Rates

1959 ◽  
Vol 93 (870) ◽  
pp. 171-180 ◽  
Author(s):  
James C. King
Keyword(s):  
Developmental Rates

scholarly journals N-acetyl-L-cysteine Improves the Developmental Competence of Bovine Oocytes and Embryos Cultured In Vitro by Attenuating Oxidative Damage and Apoptosis

Antioxidants ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 860
Author(s):  
Wu-Sheng Sun ◽  
Hoon Jang ◽  
Mi-Ryung Park ◽  
Keon Bong Oh ◽  
Haesun Lee ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Early Stage ◽  
Developmental Competence ◽  
Beneficial Effects ◽  
Developmental Rates ◽  
A Cell ◽  
Bovine Oocytes ◽  
Dose Dependent

Oxidative stress has been suggested to negatively affect oocyte and embryo quality and developmental competence, resulting in failure to reach full term. In this study, we investigated the effect of N-acetyl-L-cysteine (NAC), a cell-permeating antioxidant, on developmental competence and the quality of oocytes and embryos upon supplementation (0.1–10 mM) in maturation and culture medium in vitro using slaughterhouse-derived oocytes and embryos. The results show that treating oocytes with 1.0 mM NAC for 8 h during in vitro maturation attenuated the intracellular reactive oxygen species (ROS) (p < 0.05) and upregulated intracellular glutathione levels (p < 0.01) in oocytes. Interestingly, we found that NAC affects early embryonic development, not only in a dose-dependent, but also in a stage-specific, manner. Significantly (p < 0.05) decreased cleavage rates (90.25% vs. 81.46%) were observed during the early stage (days 0–2), while significantly (p < 0.05) increased developmental rates (38.20% vs. 44.46%) were observed during the later stage (from day 3) of embryonic development. In particular, NAC supplementation decreased the proportion of apoptotic blastomeres significantly (p < 0.05), resulting in enhanced hatching capability and developmental rates during the in vitro culture of embryos. Taken together, our results suggest that NAC supplementation has beneficial effects on bovine oocytes and embryos through the prevention of apoptosis and the elimination of oxygen free radicals during maturation and culture in vitro.

scholarly journals Leucochrysa (Leucochrysa) varia (Neuroptera: Chrysopidae): Larval Descriptions, Developmental Rates, and Adult Color Variation

2006 ◽  
Vol 99 (1) ◽  
pp. 7-18 ◽  
Author(s):  
Euzileni Mantoanelli ◽  
Gilberto S. Albuquerque ◽  
Catherine A. Tauber ◽  
Maurice J. Tauber
Keyword(s):  
Color Variation ◽  
Developmental Rates

Developmental rates ofPatasson lameerei [Hym.: Mymaridae] and the effect of host egg age on parasitism

Entomophaga ◽  
1979 ◽  
Vol 24 (4) ◽  
pp. 345-348 ◽  
Author(s):  
G. L. Leibee ◽  
B. C. Pass ◽  
K. V. Yeargan
Keyword(s):  
Developmental Rates

EVOLUTION IN THE FIELD CRICKET, ACHETA ASSIMILIS FAB.

1958 ◽  
Vol 36 (2) ◽  
pp. 139-151 ◽  
Author(s):  
R. S. Bigelow
Keyword(s):  
Sympatric Speciation ◽  
Developmental Differences ◽  
Field Cricket ◽  
Temporal Difference ◽  
Laboratory Rearing ◽  
Field Crickets ◽  
Developmental Rates ◽  
Breeding Seasons ◽  
Incomplete Reproductive Isolation ◽  
Two Populations

Progeny of northern spring field cricket adults lay non-diapause eggs, undergo nymphal diapause, and overwinter as nymphs. Progeny of northern fall adults lay diapause eggs, do not undergo nymphal diapause, and overwinter as eggs. The two populations cannot interbreed freely in the field owing to a temporal difference in breeding seasons; they did not interbreed in the laboratory. Rearing experiments show that the developmental differences are genetically based rather than environmentally conditioned, and it is, therefore, unlikely that hybrids would be viable even if they were produced in the field. Consequently these two populations behave as good species. Field crickets from Virginia developed much more rapidly than did spring crickets from Quebec. Quebec spring males and Virginia females produced hybrids with developmental rates intermediate between those of their parents. More female than male hybrids were produced, and the females developed more rapidly than did male hybrids. Offspring were produced by hybrid females and Quebec spring males, but not by hybrid females and Virginia males. Partial, but incomplete reproductive isolation exists between Quebec and Virginia field crickets. A possible mechanism of sympatric speciation in insects is discussed.

scholarly journals Simulating the Influence of Vernalization, Photoperiod and Optimum Temperature on Wheat Developmental Rates

2008 ◽  
Vol 102 (4) ◽  
pp. 561-569 ◽  
Author(s):  
Gregory S. McMaster ◽  
Jeffrey W. White ◽  
L. A. Hunt ◽  
P. D. Jamieson ◽  
S. S. Dhillon ◽  
...  
Keyword(s):  
Optimum Temperature ◽  
Developmental Rates
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