News tagged with sperm cells
Without second wave of brown fat, young mice can't live without mama
For all those who have wondered where they'd be without their mothers, a study reported in the February Cell Metabolism puts a whole new spin on the question. Mice whose mothers pass along a mutant copy of a single imprin ...
Feb 07, 2012 |
not rated yet |
0
Ultrasound male contraceptive, overlooked for decades, confirmed to work
Imagine a contraceptive that could, with one or two painless 15-minute non-surgical treatments, provide months of protection from pregnancy. And imagine that the equipment needed were already in physical therapists' ...
Jan 30, 2012 |
5 / 5 (2) |
0
Scientists link dietary DHA to male fertility
Who knew that male fertility depends on sperm-cell architecture? A University of Illinois study reports that a certain omega-3 fatty acid is necessary to construct the arch that turns a round, immature sperm cell into a pointy-headed ...
Jan 09, 2012 |
5 / 5 (1) |
0
|
Researchers identify environmental exposure to organochlorines may impact male reproduction
Melissa Perry, Sc.D., M.H.S., professor and chair of the Department of Environmental and Occupational Health at the GW School of Public Health and Health Services and adjunct associate professor at the Harvard School of Public ...
Jan 09, 2012 |
not rated yet |
0
Scientists record electrical currents that control male fertility
Performance anxiety? Not for this human sperm.
Dec 29, 2011 |
4.5 / 5 (2) |
2
Parental controls on embryonic development?
When a sperm fertilizes an egg, each contributes a set of chromosomes to the resulting embryo, which at these very early stages is called a zygote. Early on, zygotic genes are inert, so embryonic development is largely controlled ...
Dec 01, 2011 |
not rated yet |
0
Researchers achieve male fertility breakthrough
A Ben-Gurion University of the Negev researcher has achieved a significant breakthrough in male fertility, producing normal sperm from mouse cells.
Nov 15, 2011 |
not rated yet |
1
A new role is hatched for female fruit flies
A team of New York University biologists has uncovered a previously unknown role for a set of cells within the female reproductive tract of fruit flies that affects the functioning of sperm and hence fertility. Their discovery, ...
Nov 08, 2011 |
5 / 5 (1) |
0
|
Live-action films of worm sperm help researchers track critical fertility enzymes
Compared to most other cells in an organism, sperm undergo a radical transformation to become compact and mobile delivery systems for paternal DNA. Even though sperm looks and moves quite differently across ...
Nov 01, 2011 |
not rated yet |
0
Sperm discoveries shed light on infertility and birth control
(Medical Xpress) -- For a sperm cell, a lot has to go right before it can fertilize an egg. And despite biblical stories of barren women and cultural traditions of blaming the female, fertility experts now ...
Oct 12, 2011 |
5 / 5 (1) |
0
|
Scientists discover important step in sperm reprogramming
When sperm meets egg, the chemical instructions that tag sperm cells must be erased so that human life can start anew. One way these instructions are erased is through demethylation, the removal of specific ...
Sep 22, 2011 |
1 / 5 (1) |
1
|
The machinery for recombination is part of the chromosome structure
During the development of gametes, such as egg and sperm cells in humans, chromosomes are broken and rearranged at many positions. Using state of the art technology, the research group of Franz Klein, professor for genetics ...
Aug 09, 2011 |
5 / 5 (3) |
5
|
The long and short of sperm tails
A team of biologists in Japan has uncovered an unexpected role for mitochondria1, the power houses of cells, in the development of sperm in the fruit fly Drosophila melanogaster.
Aug 05, 2011 |
5 / 5 (2) |
0
|
Cell phone use may reduce male fertility
Men who have been diagnosed with poor sperm quality and who are trying to have children should limit their cell phone use. Researchers have found that while cell phone use appears to increase the level of testosterone circulating ...
May 19, 2011 |
5 / 5 (1) |
0
|
Analysis of sperm differentiation reveals new mode of proteasome regulation
(Medical Xpress) -- Early in development, cells undergo a controlled demolition that helps to shape their raw, pliable material into the specialized forms they must have to do their jobs as adults. The process ...
May 02, 2011 |
not rated yet |
0
|
Spermatozoon
A sperm, from the ancient Greek word σπέρμα (seed) and ζῷον (living being) and more commonly known as a sperm cell, is the haploid cell that is the male gamete. It joins an ovum to form a zygote. A zygote is a single cell, with a complete set of chromosomes, that normally develops into an embryo.
Sperm cells contribute half of the genetic information to the diploid offspring. In mammals, the sex of the offspring is determined by the sperm cell: a spermatozoon bearing a Y chromosome will lead to a male (XY) offspring, while one bearing an X chromosome will lead to a female (XX) offspring (the ovum always provides an X chromosome). Sperm cells were first observed by Anton van Leeuwenhoek in 1677.
For more information about Spermatozoon, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
