Distinguished sperm in competition
Article Abstract:
The competition between sperm to fertilize a female's eggs is a subtle evolutionary force shaping both behaviour and physiology. New techniques have been used by Price and colleagues to determine the relative importance of displacement and incapacitation in last-male sperm precedence. Displacement alone was found to be responsible for second-male sperm precedence with a interval of two days between inseminations. Incapacitation was found to work in conjunction with displacement with seven days between inseminations, leading to an almost total precedence of the second male's sperm.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Quantum oscillations between two weakly coupled reservoirs of superfluid 3He
Article Abstract:
It is possible to achieve oscillating mass currents between two reservoirs of superfluid 3He by using an array of submicrometre apertures in a membrane separating the reservoirs to create a weak link. Researchers found that the aperture array operates as if it were a single coherent superfluid weak link. Furthermore, the time evolution of the quantum phase across the array produces current oscillations which drive the upper diaphragm at the frequency estimated by equation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
Calcium oscillations in mammalian eggs triggered by a soluble sperm protein
Article Abstract:
Mammalian fertilization is characterized by a series of calcium (Ca2+) oscillations in the egg triggered by the sperm. These fluctuations serve as a signal for egg activation and early development of the embryo. The role of the sperm in this fundamental process is analyzed by focusing on a soluble sperm protein with Ca2+ oscillogen effects in eggs. The sperm-derived oscillogen, called 'oscillin.' may be a physiological factor that initiates mammalian development.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Philopatry or dispersal: competition for territory vacancies in the splendidfairy-wren, Malurus splendens. Territorial defence is the major function of female song in the superb fairy-wren, Malurus cyaneus
- Abstracts: UV-B radiation and soil microbial communities. Strong correlation between levels of tropospheric hydroxyl radicals and solar ultraviolet radiation
- Abstracts: Tree-species competition and coexistence. Coexistence of tropical tree species. Experimental evidence for apparent competition in a tropical forest food web
- Abstracts: Pure science in an age of attrition. 1995: Science in search of 'strategies.' The year of utilitarian science?
- Abstracts: Distribution of caribou and wolves in relation to linear corridors. Antler loss and udder distention in relation to parturition in caribou