Quantcast

Latest Germ cells Stories

43510fc2846cbe34e459ab9676ddb6e41
2009-07-08 10:30:00

For the first time ever, British scientists announced on Wednesday they had created human sperm using embryonic stem cells, AFP reported. A new technique developed by researchers led by Professor Karim Nayernia at Newcastle University and the NorthEast England Stem Cell Institute (NESCI) allows the creation of human sperm in the laboratory. While the researchers believe the discovery could eventually help men with fertility problems, other experts are not yet convinced that fully developed...

2009-06-18 15:16:39

In the competition for a partner, males typically have to vie with each other "“ be it with a colorful plumage, a large set of antlers or a seductive courtship dance. The females of some species, however, copulate with several males, so that rivals even after mating are still not defeated. So their sperm become rivals. Because greater size can increase the chance of fertilization, in some species truly giant sperm cells have evolved "“ some grow to be even larger than the male...

2009-05-18 17:40:46

Hormones and chemicals resulting from happiness, depression and other mental states can affect a parent's eggs or sperm, researchers in Mexico suggest. Dr. Alberto Halabe Bucay of Research Center Halabe and Darwich in Mexico suggests brain chemicals like endorphins alter germ cells -- the eggs and sperm that produce the next generation -- but drugs like marijuana and heroin may also affect the patterns of genes active in these cells and thus the child's development. It is well known, of...

c3e64b2343a44a4170803f7e76b6b1911
2009-04-10 08:00:00

University of Nevada School of Medicine researcher leads important discoveryUniversity of Nevada School of Medicine scientists in the Department of Physiology and Cell Biology have discovered insight into the reproductive workings of the male sex chromosome that may have significant implications for male infertility and contraception.This important discovery has been published in Nature Genetics, one of the highest-ranking journals in the field of biomedical research based upon the impact...

2009-03-26 09:55:00

In contrast to women, men are fertile throughout life, but research at the Sahlgrenska Academy, University of Gothenburg, Sweden, has now shown that a fertilising sperm can get help from the egg to rejuvenate. The result is an important step towards future stem cell therapy.The risk of chromosomal abnormalities in the foetus is highly correlated to the age of the mother, but is nearly independent of the age of the father. One possible explanation is that egg cells have a unique ability to...

f2e177d096d99eb1959c337c61364e571
2009-03-18 08:59:54

University of Montreal and Maisonneuve-Rosemont Hospital Research Center study published in the journal Molecular Human Reproduction New treatments for infertility could be closer to reality, thanks to a discovery from scientists at the Universit© de Montr©al and Maisonneuve-Rosemont Hospital Research Centre. According to a study published in the journal Molecular Human Reproduction, the researchers have become the first to clone, produce and purify a protein important for sperm...

2009-02-05 14:47:29

Portuguese scientists' contribution crucial to new study to be published in Cell Scientists at the Instituto Gulbenkian de Ciência (IGC), in Portugal, are to date the only research group in the world capable of isolating the sperm cells in the pollen grain of the model plant Arabidopsis thaliana. This technique was crucial in a study to be published in the latest issue of the journal Cell, which describes how mobile sequences of DNA (called transposable elements) are...

2009-01-27 11:30:17

Human Induced Plurtipotent Stem Cells Reprogrammed Into Germ Cell Precursors For the first time, UCLA researchers have reprogrammed human induced pluripotent stem (iPS) cells into the cells that eventually become eggs and sperm, possibly opening the door for new treatments for infertility using patient-specific cells. The iPS cells were coaxed into forming germ line precursor cells which include genetic material that may be passed on to a child. The study appears today in the early online...

2008-06-08 16:34:05

"Every sperm is sacred. Every sperm is great. If a sperm is wasted, God gets quite irate," goes the song from Monty Python's movie The Meaning of Life. If the lyrics strike you as funny, it's most likely because calling a sperm cell "sacred" sounds ridiculous when men can produce so many of them. In fact, the average male will produce roughly 525 billion sperm cells over a lifetime and shed at least one billion of them per month. A healthy adult male can release between 40...

e39d9ae09a63504eb9740eec1584a6991
2008-01-29 15:30:25

Scientists discover why cells that become sperm and ova can't copy their own genesResearchers in Kobe, Japan, and Montreal, Canada, have uncovered a previously unknown mechanism which causes embryonic germ cells -- which later develop into sperm or ova -- to go through a period of "transcriptional silence," during which information from the cell's DNA cannot be copied. Without this important phase, unique to cells of this type, an organism produces sterile offspring.The study was conducted by...


Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.