Researchers found that pig eggs with multiple sperm can develop into healthy embryos with a normal number of chromosomes. The extra set of chromosomes is segregated into a separate cell, which shrivels and dies.
Astrophysicist James Annis suggests that cataclysmic gamma-ray bursts could be sterilizing galaxies, preventing extraterrestrial life from reaching Earth. This theory may provide an explanation for the Fermi Paradox, with intelligent life having recently emerged in the Galaxy and being unable to explore yet.
A new study reveals that carbon nanotubes are more energetic to roll across surfaces compared to sliding, defying conventional wisdom on friction reduction. Researchers discovered this phenomenon using the nanoManipulator device and attributed it to electron surface interactions.
Researchers found that treating women to ovulate and inseminating them through the uterus resulted in more pregnancies than other methods. The combination of superovulation and intrauterine insemination was deemed effective for infertile couples with no identifiable infertility factor and motile sperm.
Researchers identify receptor on egg surface that binds to sperm surface protein, offering new avenue for contraception. The target, alpha-6/beta-1 integrin, could be used to deceive an egg into changing its outer coat to keep sperm out.
Researchers have found that incineration of solid waste has been the dominant source of atmospheric lead to the New York City metropolitan area, contradicting current mainstream thinking. The study also suggests that solid waste combustion may contribute to other atmospheric pollutants.
The Swedish EPA has developed a new model for assessing the state of the environment, making it easier to compare local and regional areas. The model criteria cover six areas: forest landscape, agricultural landscape, groundwater, lakes and watercourses, coasts and seas, and contaminated sites.
Researchers have identified a 150-million-year-old piece of Earth's crust submerged in the mantle beneath Siberia's Lake Baikal. The study provides evidence that subducted slabs eventually sink to the Earth's core, shedding light on the planet's internal dynamics.