Experimental Studies on the Duration of Life. XII. Influence of Temperature during the Larval Period and Adult Life on the Duration of the Life of the Imago of Drosophila melanogaster

1929 ◽  
Vol 63 (684) ◽  
pp. 37-67 ◽  
Author(s):  
W. W. Alpatov ◽  
Raymond Pearl
Keyword(s):  
Drosophila Melanogaster ◽  
Experimental Studies ◽  
Adult Life ◽  
Larval Period ◽  
Influence Of Temperature

scholarly journals Influence of temperature on the inheritance of adult life span in Drosophila melanogaster

Hereditas ◽  
2008 ◽  
Vol 112 (2) ◽  
pp. 117-127 ◽  
Author(s):  
ISAMU YONEMURA ◽  
MAYUMI ABE ◽  
RIKA ISHIDATE ◽  
TAKASHI ISHIYAMA ◽  
TOMIO MOTOYAMA ◽  
...  
Keyword(s):  
Drosophila Melanogaster ◽  
Life Span ◽  
Adult Life ◽  
Adult Life Span ◽  
Influence Of Temperature ◽  
Influence Of Temperature On

Experimental Studies on the Duration of Life. X. The Duration of Life of Drosophila melanogaster in the Complete Absence of Food

1924 ◽  
Vol 58 (656) ◽  
pp. 193-218 ◽  
Author(s):  
Raymond Pearl ◽  
Sylvia L. Parker
Keyword(s):  
Drosophila Melanogaster ◽  
Experimental Studies

Reproductive Homeostasis and Senescence in Drosophila melanogaster

2018 ◽  
Vol 74 (10) ◽  
pp. 1533-1538 ◽  
Author(s):  
James W Curtsinger
Keyword(s):  
Drosophila Melanogaster ◽  
Critical Point ◽  
Cohort Analysis ◽  
Adult Life ◽  
Lifetime Fecundity ◽  
Individual Fecundity

Abstract The homeostatic properties of reproduction in aging female Drosophila melanogaster are investigated. Classic studies based on cohort analysis suggest that homeostatic capacity declines gradually as daily oviposition rates decline in aging flies. Analysis at the level of individuals gives a very different picture: reproductive homeostasis remains relatively constant for most of adult life until a critical point when oviposition either ceases entirely or continues in dysregulated fashion. The collapse of homeostatic capacity is abrupt. Enhanced homeostasis is associated with increased lifetime fecundity and improved prospects for survival. The fractal concept of lacunarity can be used to parameterize the “roughness” of individual fecundity trajectories and is inversely related to homeostatic capacity.

scholarly journals The deformability of compressed concrete elements strengthened with FRCM composite materials

2013 ◽  
Vol 12 (1) ◽  
pp. 163-170
Author(s):  
Tomasz Trapko
Keyword(s):  
Composite Materials ◽  
Experimental Studies ◽  
Influence Of Temperature ◽  
Cementitious Matrix ◽  
Concrete Elements

In the paper the results of experimental studies performed on compressed concrete elements strengthened with composite fabric of FRCM (Fibre Reinforced Cementitious Matrix) technology are presented. In the studies the influence of temperature, the number of composite fabric layers and the length of ending overlap on the value and distribution of circumferential limit strains was analyzed.

Influence of Temperature and Relative Humidity on Perm-Selectivity of PET Packaging Film

2011 ◽  
Vol 295-297 ◽  
pp. 1206-1210
Author(s):  
Yan Feng Guo ◽  
Xian Ping Ma ◽  
Yu Yan ◽  
Yun Gang Fu
Keyword(s):  
Water Vapor ◽  
Relative Humidity ◽  
Experimental Studies ◽  
Thermodynamic Temperature ◽  
Packaging Film ◽  
Influence Of Temperature ◽  
Carbon Dioxide Gas ◽  
Pet Film ◽  
Pet Films ◽  
Temperature Water

The main feature of this article is the investigation on the influence of temperature, relative humidity, film thickness on permeability of PET packaging film, the analysis of perm-selectivity of the packaging films for oxygen gas and carbon dioxide gas, and the evaluation on experimental formulas of water vapor, O2 and CO2 gas permeating rates on the basis of gas molecular osmotic reaction kinetics and regression analysis. The comparison between experimental studies and calculation indicates that: (1) with increment of ambient temperature water vapor, O2 and CO2 permeating rate of PET films and PET/Al film also rise, and the logarithm of water vapor, O2 and CO2 gas permeating rates has linear relation with the reciprocal of thermodynamic temperature, and (2) the influence of relative humidity on water vapor permeating rate of PET film with thickness 12µm is the least, and that of PET film with thickness 20µm and PET/Al film with thickness 18µm is a little obvious. (3) The PET films hold remarkable perm-selectivity for O2 and CO2 gas, and CO2 gas permeating rate is about two times of O2 gas, yet O2 and CO2 gas permeating rates of PET/Al film are both very low and have small difference, so the PET/Al film has better barrier performance than the PET film.

scholarly journals Sexual selection favours good or bad genes for pathogen resistance depending on males' pathogen exposure

2019 ◽  
Vol 286 (1902) ◽  
pp. 20190226 ◽  
Author(s):  
Patrick Joye ◽  
Tadeusz J. Kawecki
Keyword(s):  
Drosophila Melanogaster ◽  
Sexual Selection ◽  
Female Choice ◽  
Experimental Studies ◽  
Pathogen Resistance ◽  
Condition Dependence ◽  
Indirect Benefit ◽  
Intestinal Pathogen ◽  
Sexual Traits ◽  
Pathogen Exposure

Resistance to pathogens is often invoked as an indirect benefit of female choice, but experimental evidence for links between father's sexual success and offspring resistance is scarce and equivocal. Two proposed mechanisms might generate such links. Under the first, heritable resistance to diverse pathogens depends on general immunocompetence; owing to shared condition dependence, male sexual traits indicate immunocompetence independently of the male's pathogen exposure. By contrast, other hypotheses (e.g. Hamilton–Zuk) assume that sexual traits only reveal heritable resistance if the males have been exposed to the pathogen. The distinction between the two mechanisms has been neglected by experimental studies. We show that Drosophila melanogaster males that are successful in mating contests (one female with two males) sire sons that are substantially more resistant to the intestinal pathogen Pseudomonas entomophila —but only if the males have themselves been exposed to the pathogen before the mating contest. By contrast, sons of males sexually successful in the absence of pathogen exposure are less resistant than sons of unsuccessful males. We detected no differences in daughters’ resistance. Thus, while sexual selection may have considerable consequences for offspring resistance, these consequences may be sex-specific. Furthermore, contrary to the ‘general immunocompetence’ hypothesis, these consequences can be positive or negative depending on the epidemiological context under which sexual selection operates.

Experimental studies on development in Drosophila melanogaster. II. Regulation in the early egg

1936 ◽  
Vol 73 (1) ◽  
pp. 109-125 ◽  
Author(s):  
R. B. Howland ◽  
B. P. Sonnenblick
Keyword(s):  
Drosophila Melanogaster ◽  
Experimental Studies
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