sperm-

But sperm don't have elaborate cells, just a tightly packed nucleus and a tail for swimming to the egg.

Starting with a person's own skin would also mean the lab-grown sperm or eggs would not be rejected by the body.

When I did try to gain just a touch of freedom by retracing a few steps, I felt like a sperm trying to swim the other way.

Biologists have been trying to make sperm outside the body for almost a century.

When this little baby grow up and that for her mother who donated sperm, that is, de facto father, love each other know each other.

while sperm can survive for several days inside a woman ' s reproductive tract , an egg can only survive for up to 24 hours after ovulation.

Bone marrow cell micronucleus test and mice sperm abnormality test had negative results and there was no mutagenicity.

The result of this process is sperm cells ready to fuse with an egg.

Their study discovered that it did not matter if the man was fat or thin - such a diet had the same negative effect on sperm concentration.

The boy protested; he said he knew his sperm donor, who had a daughter of his own.

He and his wife bought donor vials from a cryogenic sperm bank and he was inseminated at home.

In the course of a man's life, most of his sperm cells are ejaculated under conditions that offer no chance for a fertilization.

Sperm ejaculated into a woman's vagina can live in a woman's reproductive tract for up to five days or perhaps even longer.

Robertson said sperm was more likely to fail if the woman had not previously been exposed to that man's semen for at least three months.

She was created not out of the union of a sperm and an egg but out of the genetic material from an udder cell of a six-year-old sheep.

British scientists are ready to turn female bone marrow into sperm, cutting men out of the process of creating life.

IVF is a method of assisted reproduction in which a man's sperm and a woman's eggs are combined outside of the body in a laboratory dish.

Your sperm count is still spot checked on each donation; if it's too low, you don't get paid for that deposit.

"One possibility has to be that it altered the sperm . . . in motility, some increased risk of DNA damage, " she said.

The real question is: how much heat kills sperm?

In this method, an egg will be taken out of a woman, fertilized using sperm in a cell culture dish, and then returned to the woman.

But he said methods used to measure sperm have changed significantly over time and have not always been reliable.

In this study, researchers found a connection between a mutation in sperm DNA and a form of dwarfism known as achondroplasia.

Sitting with a computer on the lap will raise the temperature of men's scrotums, which could affect sperm quality, Reuters reports.

According to research, Swedish sperm donors do it out of a sense of altruism.

Nine months earlier, he'd handed Harrington, a longtime friend, a container of his sperm to take with her to a fertility doctor.

If the trapped retrovirus happened to be in sperm or egg cells, its DNA might be passed down to the host's descendants.

The female stores the sperm until she is ready to lay eggs. She may lay 100 at a time, protecting them in a silken egg sac.

A word of caution for men trying to have kids: your laptop may be impacting the quality of your sperm.

He has been married to his wife for five years and the couple bought sperm from a donor when they decided to start a family.

She said Irish law does identify the sperm donor as the father, and he therefore had a right to have a relationship with his son.

The research did not investigate whether the improvement in sperm quality led to better pregnancy rates.

The sperm protein used in the new birth control vaccine is called Ph-20. So far it has only been found in Guinea pigs.

Having actually been a sperm donor, I can say that you had better be prepared for a long haul.

"In this case we were fortunate that Mr Biblis probably had a very good healthy sperm count to start off with, " he said.

Infertility is often caused by the failure of sperm and eggs to meet in the natural way.

Robin Lovell-Badge, of the National Institute for Medical Research in London, said the creation of female sperm is at least a decade away.

Several sperm banks in New York City, where men are paid about $60 each time they donate, said there had not been a rise in donors.

"IVD sperm can only be produced from stem cells with male [XY] chromosomes, " he said.

While abstaining from sex for a few days raises the sperm count, quality can be damaged if a man ejaculates too infrequently.

A spermatophylax, which can weigh up to 30 percent of a male's body weight, is essentially like a really good snack attached to their sperm.

They do not affect the sperm count or concentration in men, nor do they affect the size of your testicles or volume of ejaculate (more).

The DNA can be taken from blood, sperm, saliva or other samples that would be relevant in forensic case work, say the researchers.

But previous sightings and sound recordings closer to the surface suggested that the sperm whales are relatively few and far between.

Sperm competition theory does seem to bear out in the natural world.

However, even a small additional effect on scrotal temperature might be enough to affect a man's sperm quality.

Sperm #1: I'm not getting shot out of that thing. What if he's masturbating ? I'm liable to end up on the ceiling.

Combined addition of SOD and CAT is superior to that of SOD and GSH in the protective effect of giant panda frozen sperm.

By the hospital for examination, it was Mr. Huang might be an overdose of radioactive radiation, low sperm survival.

At the end of the trial period, the men's sperm count will continue to be monitored to assess how quickly fertility levels return to normal.

Couples who have children from artificial sperm created from women would be able to have girls only.

We did sperm-zona pellucida binding and ZP-induced acrosome reaction experiments with the two groups of men's sperm separately.

Usually one egg matures at a time, and that's why if sperm is present during ovulation, a woman only gets pregnant with one baby.

CONCLUSION The Morinda officinalis oligosaccharides might be the main active substance in Morinda officinalis for sperm product.

"[With] the males, even with one testis, the quality of that sperm was just abysmal, " she says.

In this case, the woman asked doctors to remove the sperm from her husband's body and store it in a sperm bank.

The measurement of the ability of sperm to undergo the acrosome reaction (AR) is conventionally used for assessment of sperm capacitation.

These could then be fertilised by his partner's sperm and placed into the womb of a surrogate mother.

With the extension of treated time, we found that the point of phosphorylation was appeared slightly at sperm flagellum.

Sperm whales, also found in the Antarctic, lie at the surface blowing repeatedly so as not to get the bends.

They were studying the sea squirt, an animal that reproduces by spewing sperm and eggs into the water and leaving the rest to chance.

Another involves briefly heating the testes with ultrasound, which can halt sperm production for months, she said.

EDINBURGH (Reuters) - Some sperm donation clinics invite men to leave a message behind for their unborn child to hear when they are 18.

At least that's what Swedish researchers have found in what is thought to be the first study to examine personality traits of sperm donors.

"This was just another day at the lab for us, the fact the sperm had been stored for 22 years was just an after thought, " Wing said.

I spend my last two weeks nearly dancing around the booths, picking up the same sperm-crusted rags with aplomb, rather than dismay.

So, if correct, the claims made by Newcastle University would be a major advance for sperm biology and we are right to be excited by it.

Results on safety, sperm counts and pregnancy will be analyzed in case different doses or formulations might work better, he said.

Sperm counts fell sharply within a week of male monkeys being given the contraceptive.

China's sperm banks have failed to satisfy the growing demand due to a lack of qualified semen donors, domestic media reported recently.

On the Web site, parents can register the birth of a child and find half siblings by looking up a number assigned to a sperm donor.

In the type of parthenogenesis observed in sharks, one of those cells behaves like a sperm and fertilizes the egg.

An egg cell removed from Mrs. , Carr was fertilized in a laboratory dish with sperm from her husband.

Mitochondria are the power stations supplying energy for sperm motion and mobility -- one of the crucial factors in fertility.

He said, look, he said, this doesn't put a barrier between sperm and egg. All it does is artificially create a safe period.

modified portions of the pelvic fins in male sharks, rays and chimaeras used for transferring sperm to the female.

However, even asmall additional effect on scrotal temperature might be enough to affect a man's sperm quality.

Well, because sperm have a long journey to accomplish and the majority of the little guys simply are not up to it.

It's not easy to be a sperm donor.

It is, moreover, a process that could apply equally to the sperm of putative fathers who were starved around the time of mating.

Others need only a special vibrator to collect sperm; insemination of their partners can be done with a syringe in private, at home.

The sperm with the Y chromosome were leaner and faster and could swim down to the bottom of the tube more efficiently.

Strenuous exercise may hurt fertility, though. Men who run more than 100 miles a week have lower sperm counts and testosterone levels.

In the latest study, 15 triathletes with an average age of 33, were asked not to have sex for three days before giving a sperm sample.

The process that allows a man's DNA to fold up in sperm and then unfold again after fertilization may become compromised.

Whalers once believed that the oily fluid was sperm, but scientists still do not understand the function of spermaceti.

Sperm whales, which spend more time than other species at the surface, were also vulnerable.

In the first scientific study of its kind, researchers found Wi-Fi on laptops could be causing damage to your sperm's DNA.

Germline cells are the only cells in the body that grow into sperm or eggs.

"Our research offers a plausible explanation for why some sperm malfunction, " he said.

Germline cells are the only cells in the body that grow into sperm or eggs.

"Our research offers a plausible explanation for why some sperm malfunction, " he said.

"It would take a lot of whale sperm to make the sea that salty, " he said.

The couple made a $10, 000 down payment and decided to try for a child using a college-educated American egg donor and their own sperm.

At the moment when a lone sperm penetrates a mature egg, conception or fertilization takes place.

If that host cell is a sperm or egg cell, or the precursor to such a cell, then the lodged DNA may get passed down the generations.

In a study published in "Fertility and Sterility, " researchers noted that many lubricants tended to be 'toxic' to sperm, despite labeling.

Some interventions might be possible because men produce sperm continuously, and their choices can affect sperm quality.

A template is held over the head of each sperm on the computer screen to determine its size and shape.

Using rabbits, Dr. Amory said, he discovered the drug blocks production of retinoic acid, important for sperm production.

Using rabbits, Dr. Amory said, he discovered the drug blocks production of retinoic acid, important for sperm production.

"If you provide sperm to a woman other than your wife, " Hollinger says, "you are not the father. "

On the surface, freezing eggs sounds simple. After all, doctors have been freezing sperm for 30 years.

Without a protective protein barrier, sperm struggles to reach its goal. It reduces 30 percent of pregnant rate of his partner.

When a couple is unable to get pregnant on their own, sometimes they use a donor's egg or sperm. This is called "gamete donation" .

Each individual begins life as a simple cell, sown together by the bonding of the male [[sperm]] with the female [[egg]].

The fact is: do not work. Urine from the urethra above vagina excreted, it will not wash away the sperm.

A British man may have fathered 600 children by repeatedly using his own sperm in a fertility clinic he ran, it has emerged.

When they removed the Boule gene from a male mouse, the animal remained healthy but did not produce sperm.

A study has raised concerns that a chemical used in food packaging might affect the quality of men's sperm.

A study has raised concerns that a chemical used in food packaging might affect the quality of men's sperm.

You might be, after the recent announcement that scientists in Newcastle, England, have created human sperm from embryonic stem cells.

Scientists are divided over reports that sperm counts have declined over the last 50 years and that environmental factors are to blame.

Immunogold labelling technique was used for in situ ultrastructural detection of antibodies 51KD human sperm membrane antigen.

Fertilization is possible as long as the sperm remain alive.

The rest of the cause is unknown, though reduced sperm quality in men may be a factor.

Having sex every day improves the quality of men's sperm and is recommended for couples trying to conceive, according to new research.

When Xiao Bo's father is on his deathbed, he asks Xiao Bo to see him off with his sperm.

But Dr Allan Pacey, a sperm biologist at the University of Sheffield, said he was not convinced the sperm were fully developed.

Sperm count, shape, and motion ( motility) were similar in both groups of men.

Sperm count, shape, and motion ( motility) were similar in both groups of men.

The IVF procedure entails taking an egg from a woman and fertilizing it in the lab-dish with sperm donated from a man.

kept a thorough record of every sperm emission. . .

Figs increase the mobility of male sperm and increase the number of Sperm as well to overcome male sterility .

Killer whales, who live at the top of the ocean food chain, used to prey on sperm and baleen whales.

Stem cells with female [XX] chromosomes can be prompted to form early-stage sperm but do not progress further.

To even be considered, you and your sperm have to meet their criteria.

The winding tissue likely adds a jolt of horsepower to the sperm cell, he said.

One of them has started growing a tube that transfers the sperm to the ovule of a receptive ovary.

The laminate appendages of eupyrene sperm disappeared, and the sperm was surrounded by an envelope from top to tail.

The laminate appendages of eupyrene sperm disappeared, and the sperm was surrounded by an envelope from top to tail.

But for now I can only agree that they are "sperm-like" and I urge caution about the findings until we know more.

And of course this will impact up the food chain, to fish and even sperm whales who dive deep to graze the ocean floor.

Hedgehogs plug their partner's vagina with excess sperm to stop anyone else's getting a look in.

female parthenogenesis in which the embryo contains only maternal chromosomes due to the failure of the sperm to fuse with the egg nucleus.

Their whale ship had been sunk by an enormous sperm whale.

When men go without ejaculating, the number of sperm stored in the epididymis at the top of the testicle increases.

However, donations of eggs, unlike those of sperm, take a lot more than a porn magazine and a plastic cup.

But researchers in Israel have finally been able to create a oral pill that deactivates sperm before they reach the womb.

Objective To try to provide an experimental diagnostic methods to determine sperm viability.

Objective To try to provide an experimental diagnostic methods to determine sperm viability.

Sperm therefore would have an easier time fertilising the egg of a woman with large breasts.

When fertilization happens, changes occur on the surface of the egg to prevent other sperm from penetrating it.

No more than sperm flagella , but in cycads and ginkgo head of the sperm head is still swimming.

Sperm ejaculated outside the body may survive only minutes to a few hours.

Being admitted to California Cryobank as a sperm donor is a bit like getting into Harvard.

The sperm bank protected his anonymity, just as it promised.

In some cases, when both the man and woman are infertile, both donor sperm and eggs have been used.

If astray sperm actually fertilized the wrong egg, the result would be a hybrid that would almost certainly die.

What today still confuses scientists is women have no organ like men's spermatophore to store sperm, then where is her "sperm' stored. "

Earlier research has showed that warming the scrotum even more than one degree Celsius is enough to damage sperm.

Guys, here's another reason to eat your veggies: they might be good for your sperm.

Daily sex can improve the genetic quality of a man's sperm and could raise his chances of fathering a child, research has suggested.

If you exercise to exhaustion, you may experience a temporary change in hormone levels and a drop in sperm quality.

If the egg is not fertilized by a sperm, the thickened lining of the uterus consisting of blood-filled uterine tissue is shed.

"My ex-husband's Japanese, " she explains. "He's just a sperm donor. "

There have been an increasing number of studies that have found damage to sperm vitality and motility in men.

Andrew and his friend, a young sperm whale named Scar, were swimming together off the west coast of Dominica.

During the time between sex and conception, sperm travel through the fallopian tubes until they potentially meet up with an egg.

They then transplanted these cells into the testes of infertile male mice -- which went on to produce healthy sperm.

Oviduct inflammatory can happen once adhesion, heavy then lumen out-of-the-way, sperm cannot through cannot conceive.

Nitric oxide as a cytotoxic factor may be partial to kill sperm and the sperm suppression activity due to infertility .

No green algae species is at the genitals of water mycophenolate similar, but active sperm, mature oocysts in only one egg.

Earlier research has shown that warming the scrotum more than one degree Celsius is enough to damage sperm.

Nicole Polizzi: "I don't really like the beach. I hate sharks, and the water's all whale sperm. That's why the ocean's salty. "

They swarm her in a frenzy, releasing sperm as she releases her eggs.

British scientists were today claiming to have made medical history by creating human sperm in the laboratory.

Only one of the two methods showed a link between higher BPA levels and poorer quality sperm.

In about half of infertile couples, the cause lies with the men and experts have traditionally blamed low sperm count.

A sperm bank for corals of the Great Barrier Reef could help preserve the reef's genetic diversity and aid in later restoration efforts.

In gymnosperms , the egg into the neck with only one of the two sperm and egg fusion.

Sperm whales gather in their breeding grounds off the Caribbean island of Dominica in a file photo.

Sperm donors can provide samples for the creation of up to ten families.

Donor sperm may be used for insemination or in an ART cycle.

Great advances have been achieved in intracytoplasmic sperm injection (ICSI) in mammals, which played important effects in many fields.

Reproduction of sperm and the basic life of his unit, gasification of woo.

By ejaculating daily, theoretically sperm should be healthier and more able to achieve conception.

Klein also denied media reports that he was the sperm donor of Jackson's two children with his ex-wife Debbie Rowe.

The function of the vitamin C, is to lower the sperm occurrence nin to gather the phenomenon, but beneficial semen liquefaction.

How the millions of liters of oil will impact sperm whales and other cetaceans is an ongoing, unintentional science experiment.

Sperm problems can arise from genetics or environmental exposure. Smoking, obesity and diabetes can be contributing factors too.

Contraceptive corn is based on research on the rare condition, immune infertility, in which a woman makes antibodies that attack sperm.

The volume summarizes many unique and revealing characteristics of the sperm cell that have only recently been identified.

Objective: To investigate the relationship between the infection of the ureaplasma urealyticum with the sperm quality of male sterility.

abstract: The interaction between the riboflavin(RF) and herring sperm DNA was investigated by fluorescent spectrometry.

After a week of daily ejaculations, the sperm was re-measured.

But in angiosperms into the embryo sac in the two eggs and sperm, respectively, and a nuclear fusion.

Ms. Kramer, who had her son, Ryan, through a sperm donor, started the registry in 2000 to help connect so-called donor families.

The main purpose of the experiment was to select media and methods to induce simental sperm in vitro capacitation.

Andrew and his friend, a young sperm whale named Scar, swim together off the west coast of Dominica.

Mature sperm can wait up to two weeks in a holding area called the epididymis before they make their debut.

The drug kills by messing up the electrical charge of the sperm's head, which ruptures, forcing out enzymes.

The sperm's mitochondria are thought to be destroyed after it has penetrated the egg.

He put some of his sperm in a syringe and gave it to Piper.

A yellow, waxy oil obtained from the head of the sperm whale and used as an industrial lubricant.

These studies also show that men with an active sex life have healthier sperm, and sexually active women have fewer menopause symptoms.

Figs increase the mobility of male sperm and increase the numbers of Sperm as well to overcome male sterility.

Figs increase the motility of male sperm and increase the numbers of Sperm as well to overcome male sterility.

Samples collected at the end of the program showed less DNA damage and higher sperm motility than samples from control subjects.

Anti-androgens used to treat prostate enlargement and cancer interfere with sperm production.

Healthy sperm aren't always a given. Understand how lifestyle factors can affect your sperm and what you can do to improve your fertility.

Formation of a viable zygote by the union of the male sperm and the female ovum; fertilization.

Another study presented at the conference concluded that diabetes in men damages their sperm and is linked to male infertility.

Modern lifestyles, and exposure to chemical pollution, are blamed for a precipitous drop in sperm counts in men worldwide.

Over the last fifty years, sperm counts in men have fallen by half in Europe.

You're most likely to be fertile if more than 40 percent of your sperm are moving.

It was already known that the speed at which a sperm's tail moves was controlled by the pH or acidity level inside its body.

Second, not hard affected male erectile birth but does not equate to male infertility: sperm or eggs is pregnant with new the basis of life.

The market for sperm has changed dramatically thanks to a procedure called ICSI, for intracytoplasmic sperm injection.

Later he pioneered the use of mice to nurture the sperm of men with poor fertility.

The tags on the sperm DNA did not vanish, as textbooks say.

The U. S. breakthrough could unlock many of the secrets of egg and sperm production, leading to new drug treatments for infertility.

He allowed these "enucleated" eggs to be fertilized by sperm from sea urchins of the genus Echinus.

At a certain hour, on a certain night, mature2 corals suddenly release clouds of eggs and sperm into the sea.

The progestin tricks the brain into signaling the testes to stop producing testosterone, which in turn stops the production of sperm.

Then, just about a decade ago, it was discovered that sperm have proteins on them that react to the presence of certain chemicals.

At the center is a minute opening, called a micropyle, through which the sperm enters the egg.

Objective: To observe the clinical efficacy of acupuncture-moxibustion therapy for infertility due to sperm abnormality (SAI).

With progestin, the brain signals the testes to stop producing testosterone, arresting sperm production.

IntraCytoplasmic Sperm Injection (ICSI) is a procedure in which sperm is injected into the oocyte (egg) cytoplasm.

However, its close relative, the Colossal Squid, may grow to much greater sizes, as evidenced by the size of sucker marks on sperm whales.

A study in 2006 found older men are more likely to father dwarves, due to an age-related genetic mutation in their sperm.

Gangs of women in Zimbabwe have been picking up male travellers to have sexual intercourse and harvest their sperm, according to reports.

It is produced by the body in the liver and kidneys and stored in the skeletal muscles, heart, brain, and sperm.

This birth control method uses testosterone, and sometimes progesterone, to stop sperm production.

It is believed that the sperm whale dives deeper than any other cetacean.

Amphibian sperm cells have yet to be cryogenically preserved; they too will need careful management.

Here's the deal: Every year, more babies are born stemming from sperm or embryos that have been stored for months or years.

But one prominent scientist has already come up with a bold scenario for correcting genetic diseases in sperm.

When inside a woman's body, a sperm can live up to 5 days!

To a young guy with not much money, sperm donation seems too good to be true.

This is the first dedicated account of the sperm cell to be published in almost a decade.

Many species ranging from zebras to insects use the strategy of sperm ejection - but the evolutionary ideas behind it are often uncertain.

Sperm whales' heads are filled with a mysterious substance called spermaceti .

Some evidence suggests that sperm from both male flour beetles may be transferred to females during later heterosexual copulations.

The release time of a pyrene sperm was early than that of eupyrene sperm.

The potential recipient and the sperm of the would-be father are tested to make sure a pregnancy is viable.

The programme, a dramatisation of the epic journey sperm undertake in their quest to fertilise the egg, reveals other fertility secrets.

But as a result of the animal work, says Culver, "the technology is there" for engineering human sperm.

Could the actual process of injecting the sperm directly into the egg be damaging the child?

So what might sperm competition have to say about masturbation?

Vasectomy is a form of male birth control that cuts the supply of sperm to your semen.

sperm packet Spermatophore; a mass of sperm transferred from the male to the female by a gonopodium of the Poeciliidae.

At the top of the parade loop, the females lay their eggs and the males release their sperm, which leads to whale shark chow.

The purpose of the other sperm is to give the message to the mother' s immune system that some foreign genes mean no harm.

They're unusual in that in these animals, the sex of the individual is not determined at fertilization or when egg and sperm meet.

However, the consequent transmission of sperm cytogenetic defects and genetic defects to the offspring has aroused considerable concern.

The study showed that there's no connection between the quality of sperm and the concentrations of BPA in the body.

4 celery and celery are inhibiting production of sperm, so that sperm count fell, there did not cite impotence.

Sperm whales, however, spend considerably more time at the sea surface, so they too are becoming sunburned.