Effect of Age at Irradiation on Life Span in the Male Rat

1964 ◽  
Vol 22 (1) ◽  
pp. 106 ◽  
Author(s):  
David C. L. Jones ◽  
Donald J. Kimeldorf
Keyword(s):  
Life Span ◽  
Male Rat ◽  
Effect Of Age

Diplostomum spathaceum (Rud. 1819): effect of miracidial age and lifespan on miracidial infectivity

1991 ◽  
Vol 65 (1) ◽  
pp. 28-30 ◽  
Author(s):  
G. D. B. Waadu
Keyword(s):  
Life Span ◽  
Constant Illumination ◽  
Free Swimming ◽  
Diplostomum Spathaceum ◽  
Different Ages ◽  
Lymnaea Peregra ◽  
Effect Of Age

ABSTRACTExperiments were performed to study the effect of age and lifespan on the infection success of Diplostomum spathaceum miracidia. Specimens of Lymnaea peregra and L. stagnalis were individually exposed to single miracidia of D. spathaceum of different ages under conditions of constant illumination at 20°C. The life-span of the free-swimming miracidium of D. spathaceum is 24 h at 20°C. It was observed that as the miracidium ages, its ability to successfully infect snails declines rapidly.

Corpus callosum surface area across the human adult life span: Effect of age and gender

1994 ◽  
Vol 35 (4) ◽  
pp. 373-377 ◽  
Author(s):  
Sterling C. Johnson ◽  
Tamra Farnworth ◽  
James B. Pinkston ◽  
Erin D. Bigler ◽  
Duane D. Blatter
Keyword(s):  
Corpus Callosum ◽  
Life Span ◽  
Surface Area ◽  
Adult Life ◽  
Adult Life Span ◽  
Age And Gender ◽  
Human Adult ◽  
And Gender ◽  
Effect Of Age

Effect of Age on the Sexual Behaviour of the Male Rat

Gerontology ◽  
1962 ◽  
Vol 6 (2-3) ◽  
pp. 133-143 ◽  
Author(s):  
Knut Larsson ◽  
Leif Essberg
Keyword(s):  
Sexual Behaviour ◽  
Male Rat ◽  
Effect Of Age

The effect of age, acquired resistance, pregnancy and lactation on some reactions of cattle to infection with Ostertagia ostertagi

Parasitology ◽  
1979 ◽  
Vol 79 (1) ◽  
pp. 157-168 ◽  
Author(s):  
J. F. Michel ◽  
M. B. Lancaster ◽  
C. Hong
Keyword(s):  
Life Span ◽  
Acquired Resistance ◽  
Challenge Infection ◽  
Previous Experience ◽  
Early Lactation ◽  
Ostertagia Ostertagi ◽  
Previous Infection ◽  
Pregnancy And Lactation ◽  
The Mean ◽  
Effect Of Age

SUMMARYAn experiment is described in which the effects of age, previous infection, pregnancy and lactation on some reactions of cattle to infection with Ostertagia ostertagi were studied. It was found that an acquired resistance to the establishment of worms developed more rapidly in 20-month-old heifers than in calves, that it was unaffected by pregnancy of the host but that it was largely lost by heifers in early lactation. The rate at which populations were turned over, i.e. the mean life-span of worms through the late 4th and 5th stages was unaffected by the factors studied. Although, in the conditions of the experiment, development of the worms was not arrested in susceptible calves, both age of the host and its previous experience of infection were significant causes of arrest, and in previously infected 20-month-old cattle 86% of the worms of a challenge infection were arrested. Pregnancy did not affect the proportion of worms that was arrested but in lactating heifers only marginally more worms were arrested than in calves. Worms that were not arrested grew more rapidly in calves and in lactating heifers than in empty heifers or those in mid-pregnancy.

scholarly journals Effect of Age on the Copulatory Behavior of the Male Rat

1992 ◽  
Vol 41 (3) ◽  
pp. 259-268 ◽  
Author(s):  
Ryoji HOKAO ◽  
Tsunekata ITO ◽  
Junko NOGUCHI ◽  
Yasumasa WAKAFUJI ◽  
Yoshio AGEMATSU ◽  
...  
Keyword(s):  
Copulatory Behavior ◽  
Male Rat ◽  
Effect Of Age

scholarly journals Effect of age on muscarinic cholinergic responsiveness and receptors in the male rat urinary bladder

1990 ◽  
Vol 52 ◽  
pp. 95
Author(s):  
Chihiro Takahashi ◽  
Toshiya Okazaki ◽  
Hiroyuki Kadowaki ◽  
Yoshiki Takao ◽  
Yoshiniri Kamisaki ◽  
...  
Keyword(s):  
Urinary Bladder ◽  
Male Rat ◽  
Rat Urinary Bladder ◽  
Muscarinic Cholinergic ◽  
Effect Of Age
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