Sperm Current Events

Sperm Current Events, Sperm News Articles.
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Fighting and females determine how males make sperm
Why do mice have longer sperm than elephants? A new study by researchers from Stockholm University and the University of Z├╝rich shows that the size of the female's reproductive tract holds the key for understanding how males make sperm. (2015-11-18)

Female birds select sperm 'super swimmers'
Sperm with shorter heads and longer tails are better at fertilising eggs, study reveals. A distinctive subset of sperm are selected inside the female for fertilization. Research may produce clues to understanding human fertility (2016-06-08)

New sperm shaker to improve IVF success
Scientists have developed a ground-breaking method for testing the quality of a sperm before it is used in IVF and increase the chances of conception. (2009-01-19)

Obesity may adversely affect sperm quality
The journal Andologia has published the first report of abnormal sperm parameters in obese men based on computer aided sperm analysis. (2017-09-20)

Protein translation in sperm
A new paper in the February 15th issue of Genes & Development lends novel insight into the cellular changes that occur in sperm while they reside in the female reproductive tract - providing a new understanding of the molecular genetics of successful fertilization. (2006-02-14)

Yale researchers develop test to identify 'best' sperm
Researchers at Yale School of Medicine have discovered a method to select sperm with the highest DNA integrity in a bid to improve male fertility. The method is comparable to that of the egg's natural selection abilities, according to the study published in the June/July issue of the Journal of Andrology. (2010-05-28)

Scientists identify new sperm protein required for fertilization
Scientists have identified a new protein that is required for a sperm to bind to an egg during the process of fertilization. This research provides important new insight into the molecular mechanisms that are involved in the initial events of sperm-egg association and may shed light on what underlies some instances of male infertility. (2003-08-21)

Freeze-dried sperm can fertilize rabbit oocytes
A team of reproductive scientists has successfully used (2004-03-03)

Why mice have longer sperm than elephants
In the animal world, if several males mate with the same female, their sperm compete to ferti-lize her limited supply of eggs. Longer sperm often seem to have a competitive advantage. However, a study conducted by researchers from the universities of Zurich and Stockholm now reveals that the size of the animals also matters. The larger the animal, the more important the number of sperm is relative to sperm length. That's why elephants have smaller sperm than mice. (2015-11-18)

Study examines sperm production in men with testicular cancer
In a study of men with testicular cancer, increasing tumor size relative to testis size was linked with a reduced ability to produce sperm. (2018-04-19)

Sperm counts unchanged over 50 years
Although many American men have at least one type of abnormality in their sperm, they are just as virile as their grandfathers, University of Southern California researchers have found. In fact, their sperm densities were no different from samples collected in major studies in the 1950s. (2000-03-27)

Smoking may have negative effects on sperm quality
A recent study found that that sperm of men who smoke has a greater extent of DNA damage than that of non-smokers. (2016-06-22)

TU Dresden biologists examine sperm quality on the basis of their metabolism
Every tenth couple worldwide is affected by infertility. The reasons for this are manifold, but mostly well researched. Nevertheless, about fifteen percent of cases remain unexplained. A team of biologists at TU Dresden has now gained new insights into the metabolic properties that make up a good sperm cell. (2019-11-28)

Bacteria That Disable Sperm
Some men have low fertility because of microorganisms lurking in their semen, say researchers in Hungary. They have shown that anaerobic bacteria, present in up to two-thirds of men, can prevent sperm from swimming well enough to reach an egg. (1998-10-14)

Field-cricket study shows that when it comes to competition, sperm quality matters
By studying the relationship between sperm viability and reproductive success in a cricket species, researchers have come closer to understanding the contribution of sperm quality to reproductive success, at least in insects. (2005-02-07)

Screw-shaped bird sperm swim faster -- but it comes at a cost
New research from the Natural History Museum in Oslo suggests that bird sperm cells with a spiral or screw-like shape swim faster than straighter sperm -- but that the spiral shape also makes them more fragile. (2019-04-04)

Frozen, fresh sperm both effective for in vitro fertilization
A new Mayo Clinic study shows that couples using in vitro fertilization have the same likelihood of successful pregnancy whether the sperm used is frozen or fresh. Researchers presented the results today at the annual scientific meeting of the American Urological Association in San Francisco. (2004-05-12)

Quality control mechanism tags defective sperm cells inside the body
Defective sperm cells do not pass through the body unnoticed. A new University of Missouri study provides evidence that the body recognizes and tags defective sperm cells while they undergo maturation in the epididymis, a sperm storage gland attached to the testis. According to researchers, only the best sperm that have the highest chance of succeeding in fertilization will survive the production process without a (2008-01-23)

'Old' sperm produces healthier offspring
Research shows that sperm that live for longer before fertilising an egg produce healthier offspring. What's more, these offspring go on to have longer, healthier lifespans -- and in turn produce more and healthier offspring themselves. It was assumed that it doesn't matter which sperm fertilises an egg. But this shows that there are massive differences between sperm and how they affect offspring. The research was carried out in zebrafish but may have implications for human fertility. (2019-02-14)

How to spot winning sperm: examine their racing stripes
Millions of sperm enter the race to fertilize, but only one wins the sprint to the egg. Now Yale researchers have discovered that these winning sperm possess a few key molecular characteristics that differentiate them from those left behind, they report Dec. 1 in the journal eLife. (2020-12-01)

Sea squirts in sperm warfare
Life is pretty competitive for sea squirts fighting for space on underwater rocks. Now, biologists in California have found that rival species have a novel weapon to take their competitor out of the game-they use their sperm to kill the eggs of the other species. (2000-03-21)

There is not one kind of 'good sperm' -- it depends on other qualities in the male
In a study published in Behavioral Ecology researchers from Uppsala University show that the same type of sperm is not always the best for all male birds. Depending on how attractive or dominant you are you might be more successful with longer or shorter sperm. (2018-08-16)

Death No Longer Provides An Absolute Barrier To Fatherhood
Sperm taken from a dead man in the US have been used for the first time to establish a pregnancy. This seems sure to intensify calls to tighten regulations on reproductive technologies. (1998-07-15)

Rodent sperm work together for better results
Although, sperm are inseminated in millions each sperm goes it alone. However, under some circumstances it might be advantageous for sperm to cooperate with one another. This is especially likely to be the case when females are promiscuous and sperm of one male have to compete against those of rival males. (2007-01-23)

Sperm can count
The speed at which the calcium concentration in the cell changes controls the swimming behavior of sperm. They can calculate the calcium dynamics and react accordingly. (2012-03-07)

Why fruit fly sperm are giant
The fruit fly Drosophila bifurca is only a few millimeters in size but produces almost six centimeters long sperm. Researchers led by the University of Zurich provide the first explanation for the evolution of such giant sperm. Larger sperm are able to displace their smaller competitors from the female reproductive tract -- a competitive advantage in fertilizing the eggs. Female promiscuity increases the fertilization success by larger males, which can produce more of the longer sperm. (2016-05-25)

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 species, SF State researcher Diana Chu and colleagues now say that there are at least a few key enzymes that are critical for sperm development and mobility in species as different as mice and nematode worms. (2011-11-01)

Ecologists home in on how sperm whales find their prey
Ecologists have at last got a view of sperm whales' behaviour during their long, deep dives, thanks to the use of recently developed electronic (2006-05-22)

Genetic switch determines egg or sperm
New experiments in the Japanese rice fish show that the fox13 gene appears to be the switch that determines whether a germ cell becomes an egg or sperm cell. (2015-06-11)

Mysterious males: Asexual female nematodes produce males for sperm, not genes
Getting at why nematodes engaged in a unique female-favoring reproduction strategy produce males at all, researchers report that the asexual females produce limited numbers of male offspring to exploit them for their sperm in order to make more males, and in a ratio meaning the resultant sons are more likely to mate with their sisters. (2019-03-14)

Genomic imprinting in disruptive spermatogenesis
Low sperm counts could be associated with genomic imprinting disease and could carry a raised risk of transmitting imprinting defects following assisted reproductive technologies, claim researchers in this week's issue of The Lancet. (2004-05-20)

Sperm-specific gene expression in organisms including mice, macaques and men
A large class of mammalian genes is not completely shared throughout sperm development and differentiation, according to a new study of sperm in organisms including mice, macaques and men. (2021-01-14)

Some mouse sperm can identify, and even cooperate with, its brethren
Some mouse sperm can discriminate between its brethren and competing sperm from other males, clustering with its closest relatives to swim faster in the race to the egg. But this sort of cooperation appears to be present only in certain promiscuous species, where it affords an individual's sperm a competitive advantage over that of other males. (2010-01-20)

Dual protein knockout could lead to new male contraceptive
A new male contraceptive could be on the horizon after scientists identified a novel way to block the transport of sperm during ejaculation. (2013-12-02)

Sperm Protein May Hold Clues For Fertility And Contraceptives
A protein found on the surface of the sperm of all mammals appears crucial for the union of the sperm and egg, and for movement of the sperm into the animal's oviduct, announce researchers at the University of California, Davis. (1998-09-17)

Young single men are more likely to bank sperm before testicular cancer treatment
A quarter of men with testicular cancer banked their sperm before treatment, but only six percent of those used the sperm to father a child. Men who banked their sperm averaged 26 -- 10 years younger than those who didn't -- and were more than twice as likely to be single. As most men treated for testicular cancer are young, and survival rates exceed 90 percent, post-treatment fertility is an important issue, say researchers. (2007-01-08)

Sexual healing? Not likely
A new study shows the production of sperm is more biologically taxing than previously thought, and expending energy on it has significant health implications. (2012-01-29)

Male songbirds can't survive on good looks alone, says a new study
Brightly colored male songbirds not only have to attract the female's eye, but also make sure their sperm can last the distance, according to new research. (2020-01-15)

New study by Syracuse University scientists uncovers a reproduction conundrum
When it comes to sperm meeting eggs in sexual reproduction, conventional wisdom holds that the fastest swimming sperm are most likely to succeed in their quest to fertilize eggs. That wisdom was turned upside down in a new study of sperm competition in fruit flies (Drosophila melanogaster), which found that slower and/or longer sperm outcompete their faster rivals. (2012-08-01)

SU biologists' work with 'glow-in-the-dark' sperm sheds light on sexual selection
By genetically altering fruit flies so that the heads of their sperm were fluorescent green or red, Belote and his colleagues were able to observe in striking detail what happens to live sperm inside the female. The findings may have huge implications for the fields of reproductive biology, sexual selection and speciation. (2010-03-18)

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