Egg investment is influenced by male attractiveness in the mallard

Article Abstract:

Female mallard investment, in terms of egg volume, may vary according to male attractiveness, even though males seem to offer no direct material advantages to females. It is possible that females change their egg investment in response to male attractiveness because attractive males are more likely to have successful offspring. The amount a female can invest in eggs may just be a direct result of being paired to a particular male. It is clearly very important to take account of all maternal effects before attributing differences in offspring viability to paternal genetic impacts.

Bird eggs, Bird nests, Mallard

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Male-female differences in fertility and blood pressure in ACE-deficient mice

Article Abstract:

Disruption in angiotensin-converting enzyme (ACE) causes loss of fertility and reduces blood pressure by 15-20 mm below normal in homozygous male mutant mice. It caused no noticeable loss of fertility or blood pressure on homozygous female mutants. Serum ACE activity was reduced in both male and female. ACE is dipeptidyl carboxypeptidase that generates the vasoconstricting angiotensin II and inactivates peptide bradykinin. These findings have important implications for human fertility and contraception.

Analysis, Blood pressure, Angiotensin converting enzyme, Fertility

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Identification of a mouse male-specific transplantation antigen, H-Y

Article Abstract:

Sex differences in tissue transplant rejection can be genetically described based on experiments that indicate that the H-YK(super k) domain of the Smcy gene plays a male-specific role as a component of Spy in the Y chromosome. Smcx encoded amino acids were replaced by various synthetic peptides to find the residues necessary for defining the T-cell epitope. Smcy and Smcx encoded different peptides in the carboxy-terminal region.

Physiological aspects, Graft rejection, Tissue specific antigens

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