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Topic: Sperm

Related Topics

Human cells

Spermatozoa

Spermatogenesis

Cell growth

Sperm competition

Cell (biology)

Cell type

Acrosome

Gamete

Egg cell

Ovum

Cell membrane

Plant cell

Semen

	Sperm Whales (Physeter macrocephalus) - Office of Protected Resources - NOAA Fisheries
		Sperm whales have the largest brain of any animal (on average 17 pounds (7.8 kg) in mature males), however, compared to their large body size, the brain is not exceptional in size.
		Sperm whales tend to inhabit areas with a water depth of 1968 feet (600 m) or more, and are uncommon in waters less than 984 feet (300 m) deep.
		Sperm whales have the potential to be harmed by ship strikes and entanglements in fishing gear, although these are not as great of a threat to sperm whales as they are to more coastal cetaceans.
	www.nmfs.noaa.gov /pr/species/mammals/cetaceans/spermwhale.htm (2080 words)

	SPERM WHALE
		Sperm whales produce ambergris, a dark, waxy substance (related to cholesterol) that is produced in the lower intestines, and is sometimes found containing squid beaks.
		Sperm whales also stick their tail out of the water into the air, swing it around, and then slap it on the water's surface; this is called lobtailing.
		Sperm whales (Physeter macrocephalus) are toothed whales (Suborder Odontoceti) although DNA analysis shows that the Sperm whale is actually more closely related to the baleen whales.
	www.enchantedlearning.com /subjects/whales/species/Spermwhale.shtml (1253 words)

	ACS - American Cetacean Society
		Sperm whales are among the deepest diving cetaceans, and are found in all oceans of the world.
		Sperm whales are still fairly numerous, but selective killing of the larger breeding-age males over many years upset the male-to-female ratio, and the birth rate has seriously declined in some populations.
		Sperm whales were killed in two massive hunts, the Moby Dick whalers who worked mainly between 1740-1880, and the modern whalers whose operations peaked in 1964, when 29,255 were killed.
	www.acsonline.org /factpack/spermwhl.htm (993 words)

	Healthy sperm: Optimizing your fertility - MayoClinic.com
		Sperm quantity and quality varies among men and can be affected by a variety of things — some you can impact, others you can't.
		Sperm are made in the testicles which are housed in the scrotum beneath your penis.
		Sperm counts are higher in the winter and lower in the summer.
	www.mayoclinic.com /health/fertility/MC00023 (1656 words)

	Andrology — University of Utah: Photo Gallery
		Transmission Electron Micrograph (TEM) of the sperm midpiece, this longitudinal section through a sperm shows the mitochondria where energy for the cell is produced, and the microtubule structure of the tail providing the ability of the sperm to swim through the reproductive tract of the female.
		The sperm acrosome is absent, and the midpiece is abnormal.
		Fluorescent micrograph of sperm stained with propidium iodide,red and pisum sativum agglutinin (PSA),green.
	uuhsc.utah.edu /andrology/photo_gallery.html (1340 words)

	How Sperm Get Hyperactive \| LiveScience
		Sperm are a lively bunch to begin with, but they become even more excited when they zero in on an egg.
		Sperm hyperactivity is necessary for breaking through two physical barriers that protect the egg from fertilization.
		A sperm's tail is called a flagellum, and it spins like a boat propeller to move the sperm forward.
	www.livescience.com /humanbiology/060208_hyper_sperm.html (694 words)

	Sexual Reproduction
		The walls of the seminiferous tubules consist of diploid spermatogonia, stem cells that are the precursors of sperm.
		Although sperm can swim several millimeters each second, their trip to and through the fallopian tubes may be assisted by muscular contraction of the walls of the uterus and the tubes.
		In sea urchins, at least, the block to additional sperm entry and the fusion of the pronuclei are triggered by nitric oxide generated in the egg by the sperm acrosome.
	users.rcn.com /jkimball.ma.ultranet/BiologyPages/S/Sexual_Reproduction.html (3512 words)

	Semen and sperm quality
		This process takes about 60 days and the sperm then takes a further 10 to 14 days to pass through the ducts of each testicle and its sperm-maturing tube, the epididymis, before it can leave the body in the semen, during ejaculation.
		Measuring sperm count is a very technical business and results can be affected by many factors, including the length of time between ejaculation and semen sample analysis, and how the sample is kept when being transported to the lab.
		Sperm count is only an indication of fertilising capacity and a normal count does not guarantee success.
	www.netdoctor.co.uk /menshealth/facts/semenandsperm.htm (1565 words)

	Sperm : by Ray Sahelian, M.D., how to improve sperm volume and health
		Possible causes of low sperm count include varicoceles, a side effect of certain medications, excessive stress, exposure to radiation or certain chemicals, smoking, testicular abnormalities that are present at birth (congenital).
		Sperm extraction is unlikely to be successful in men with a chromosomal disorder known as Klinefelter's syndrome who are over 35 years of age.
		A sperm donor is a man who gives or more usually sells his sperm, to a sperm bank, primarily for the purpose of assisting a woman anonymous to him to conceive via artificial insemination.
	www.raysahelian.com /sperm.html (3332 words)

	First sperm from stem cells raises fertility hope \| Science \| The Guardian
		Researchers in Newcastle grew the sperm from mouse embryonic stem cells and used them to fertilise eggs, resulting in the birth of seven mice, according to a study published today.
		The research is expected to have greater impact, in the near term at least, by giving scientists the ability to follow the processes by which sperm develop, a powerful tool that could shed light on the root causes of some of the most poorly understood male infertility-related conditions.
		When the scientists examined the sperm cells under a microscope, they found that although many had developed tail-like features, they were not good enough swimmers to fertilise eggs unaided.
	www.guardian.co.uk /science/story/0,,1817401,00.html (1082 words)

	Women shopping for super sperm
		The majority of these women are single or in a lesbian relationship, while a smaller number have a spouse who is infertile, but all are desperate to have a child who carries at least some of their genes.
		For example, the Toronto sperm bank Rachel Clarkson is dealing with told her that one donor, who had helped produce 11 children, had reached his limit in the Waterloo, Ont. area.
		Sperm banks usually follow the American Society of Reproductive Medicine's recommendation of 25 pregnancies for a population of 800,000.
	www.canada.com /vancouversun/story.html?id=52e43aa6-b15c-423f-a845-13a845143e70&k=9062 (2114 words)

	NATURE: Sperm Whales: The Real Moby Dick
		NATURE dives to watery depths to meet sperm whales, massive marine mammals that inhabit the world's oceans.
		behind the mystique of the sperm whale, the beast immortalized by
		To purchase the video of SPERM WHALES, please contact WNET Video Distribution by calling (800) 336-1917, or by writing to WNET Video Distribution, P.O. Box 2284, South Burlington, VT 05407.
	www.pbs.org /wnet/nature/spermwhales (178 words)

	Longest Known Sperm Create Paradox of Nature \| LiveScience
		If there was a prize for biggest sperm in nature, it would go to Drosophila bifurca, a tiny fruit fly whose coiled sperm would measure more than 2 inches long if straightened out.
		That's because the female bodies of many species are not passive arenas within which sperm compete, but more like obstacle courses, with hurdles and defenses in place to weed out weakling sperm.
		For example, the female reproductive tract might release harsh chemicals harmful to sperm, or it might evolve to become intentionally long so that the race to fertilization becomes a test of sperm endurance.
	www.livescience.com /animals/060616_big_sperm.html (646 words)

	New Sperm Selection Technology for Assisted Reproductive Technology (ART) Cleared by FDA
		With Biocoat’s new PICSI Sperm Selection Device embryologists are able to determine sperm selection in much the same way it happens in human biology.
		As a result, the selected sperm is essentially the same as one that would be successful in the natural reproductive process.
		His research proved that hyaluronan-bound PICSI-selected sperm are, in the vast majority of cases, more mature, exhibit less DNA damage, and have fewer chromosomal aneuploidies.
	www.prweb.com /releases/2006/7/prweb407895.htm (581 words)

	USATODAY.com - FDA to implement gay sperm donor rules
		Traiman said adequate safety assurances can be provided by testing a sperm donor at the time of the initial donation, then freezing the sperm for a six-month quarantine and testing the donor again to be sure there is no new sign of HIV or other infectious diseases.
		The director of one of them, Alice Ruby of the Oakland-based Sperm Bank of California, said her staff had developed procedures for identifying gay men with an acceptably low risk of HIV.
		Deborah Cohan, an obstetrics and gynecology instructor at the University of California, San Francisco, said some lesbians prefer to receive sperm from a gay donor because they feel such a man would be more receptive to the concept of a family headed by a same-sex couple.
	www.usatoday.com /news/health/2005-05-05-sperm-donors_x.htm (822 words)

	Sperm counts and teen pregnancy rates. - By Liza Mundy - Slate Magazine
		This study postulated that "environmental influences," particularly widely used chemical compounds with an impact like that of the female hormone estrogen, might be contributing to a drop in fertility among males.
		Since one man's sperm rarely has to race that of another man to the finish, things like speed and volume are less important in human sperm than in other animals, permitting a certain amount of atrophy among humans.
		Swan showed, further, that in the United States there appears to be a regional variation in sperm counts: They tend to be lower in rural sectors and higher in cities, suggesting the possible impact of chemicals (such as pesticides) particular to one locality.
	www.slate.com /id/2140985 (1524 words)

	Sperm Banks Unpopular With Patients -- Researchers Investigate Why
		Young Single Men Are More Likely To Bank Sperm Before Testicular Cancer Treatment (Jan. 9, 2007) — 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.
		Sperm Banking Gives Teenage Cancer Patients Hope For The Future (Mar. 1, 2006) — Teenage boys being treated for cancer should be encouraged to bank their sperm so they might enjoy a family life in the future, say researchers at the University of...
		Scientists Identify New Sperm Protein Required For Fertilization (Aug. 27, 2003) — In the United States, nearly 2.6 million couples have been treated for infertility with about 40 percent of those cases thought to be due to male infertility.
	www.sciencedaily.com /releases/2006/10/061005222426.htm (850 words)

	FOXNews.com - Sperm Whales Hone In on Fishing-Boat Engines to Feed - Science News \| Science & Technology \| ...
		It estimates there are 90 male sperm whales feeding from longlines in the eastern Gulf of Alaska, part of the world's largest sablefish fishery.
		Scientists found the sperm whales tend to feed on longlines in the late spring through summer, during the height of the sablefish season.
		Sperm whales in the gulf have been plucking small amounts of sablefish off the 1-3 mile longlines for at least two decades, sometimes leaving lips and or partly chewed bodies dangling from the hooks.
	www.foxnews.com /story/0,2933,184801,00.html (1012 words)

	Women could make sperm
		The researchers at Newcastle University say that the advance, when developed further, could help men with certain types of infertility to become fertile and even one day could enable a lesbian couple to have children that genetically would be their own.
		It is hoped that this new knowledge could be translated into treatments for men whose sperm is dysfunctional, although could be some years into the future.
		Only males produce sperm cells so it follows that the process is using an XY cell to produce its gametes.
	www.irishhealth.com /?level=4&id=9863 (15154 words)

	Sperm donor shortage hits Canadian infertility clinics
		Sperm stocks in Canada are significantly down since the federal government made it illegal to pay men for the donations, and the supply of sperm imported from the U.S. will eventually be cut off, Health Canada says.
		It is currently legal to import sperm from the U.S., where men are paid for their donation.
		Rather, British men are reluctant to donate because of a legislative change that allows children conceived with donated sperm or eggs to learn the name of the donor when they turn 18.
	www.cbc.ca /health/story/2006/12/19/sperm-shortage.html (1466 words)

	The UnMuseum - The Sperm Whale
		Sperm whales, enraged by an attack, have been known to turn on the boat, ram it with their heads, smash it, spill the crew out and crush the men in their powerful jaws.
		Sperm whales, like all whales, have lungs and must come to the surface to breath (a whale spout is not water, but an exhale of warm, moist air that condenses in the colder sea air).
		Sperm whales were almost hunted to extinction by man, but a ban on whaling has allowed the animals to at least partly recover their numbers.
	unmuseum.mus.pa.us /spermw.htm (1333 words)

	Sperm ............................
		Sperm, or spermatozoa (from the Greek - sperma: seed and zoon: alive) are the male sex cells, or gametes, and are carried in fluid called semen.
		This fluid provides nutrition and protection for the sperm during their journey through the female reproductive tract, an environment which is actually hazardous to the sperm because of its acidic content and immune response cells.
		Sperm hyperactivity is necessary for the sperm to be able to break through the physical barriers that protect the egg from fertilization.
	www.worsleyschool.net /science/files/sperm/page.html (778 words)

	What Is Sperm? \| Male Puberty \| Sperm Production \| Teen Boys \| Facts \| Information (Site not responding. Last check: )
		The sperm tail makes the sperm move so they can swim from the vagina to the uterus after ejaculation.
		Sperm swim about.12 inches (3mm) per hour and they need to wave their tales more than 1000 times just to swim half an inch (1.25 cm).
		Sperm is made in the testes where it takes about 72 days for one sperm to grow.
	www.kidzworld.com /article/1863-what-is-sperm-and-how-is-it-made (399 words)

	Sperm Whale Fact Sheet
		The brain of the sperm whale is the largest of any animal, averaging 15+ pounds and reaching up to 20 pounds.
		Squid is the primary food of the sperm whale, and much of its biology and behavior can be attributed to the search for this food item.
		Sperm whales are found in all of the world's oceans, except for the Arctic region.
	www.dec.state.ny.us /website/dfwmr/wildlife/endspec/spwhfs.html (677 words)

	Sperm Whale at AllExperts
		Sperm Whales are amongst the most sexually dimorphic (that is, males and females differ greatly) of all cetaceans.
		Sperm Whales are a prime example of a species that has been K-selected, which is to say that the species is believed to have developed primarily under very stable environmental conditions.
		Sperm Whales are not the easiest of whales to watch, due to their long dive times and ability to travel long distances underwater.
	en.allexperts.com /e/s/sp/sperm_whale.htm (3282 words)

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