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Tag: "sperm" at biology news

Research tracks whales by listening to sounds

...hose hydrophones, Mellinger discovered a number of sperm whales living in the Gulf of Alaska in the winter...."There are a handful of records of people spotting sperm whales in the region ?and they're all in the summer," Mellinger said. "Likewise, all of the historic...

US woman gives birth to baby from world's first frozen donor egg bank

...e technology to successfully freeze and thaw donor sperm for infertile couples has been available for decades. However, the technology to successfully freeze women's eggs did not exist until recently, prompting Cryo Eggs International (CEI) to open its doors and offer donor eggs to infertile patients who w...

How sperm crack the whip

...nfertility and design new contraceptives to thwart sperm entry into the egg. What's more, they said, the e...op on the electrical currents inside the squirming sperm cell could literally open a new window into its largely mysterious inner workings. Howard Hughes M...

Component in soy products causes reproductive problems in laboratory mice

...single oocyte that is ovulated and fertilized by a sperm to get a healthy baby. Genistein seems to have a way of making this task very difficult," said Newbold. "I don't think we can dismiss the possibility that these phytoestrogens are having an effect on the human population," said Dr. Jefferson. "Th...

A new way of looking at molecular motors

... birth or by preventing parts of the body, such as sperm tails or the tiny hairs that keep mucus flowing in the lungs, from moving when they are supposed to. The motors in parasitic organisms contribute to disease by enabling the parasites to break through biological barriers within the human body and acti...

Researchers now able to look deep into heart to view triggers of a heart's beat

...ular component that is ordinarily derived from the sperm after fertilization. A new study led by researcher...lized they don't use them--the centrosome from the sperm is used preferentially." Centrosomes remain somewhat mysterious structures, Ferree said, but resear...

Insects that produce males from unfertilized eggs reveal a surprising cellular feat

...ular component that is ordinarily derived from the sperm after fertilization. A new study led by researcher...lized they don't use them--the centrosome from the sperm is used preferentially." Centrosomes remain somewhat mysterious structures, Ferree said, but resear...

Tool developed to silence genes in specific tissues using RNAi

...his gene is important in the production of healthy sperm by encoding a regulatory protein called a transcription factor that controls the formation of adherens junctions, or the cell-to-cell contacts between nurse cells and the germ cells that ultimately become sperm. Using RNAi to silence WT1, therefore,...

Protein translation in sperm

...el insight into the cellular changes that occur in sperm while they reside in the female reproductive tract..., protein translation does take place in mammalian sperm prior to fertilization. Their paper has been released online ahead of print at www.genesdev.org. ...

Hormonal male contraception reversible after few months for all men

...ulation suppression by hormone treatment in women, sperm production can be fully inhibited by androgen or a... men. With such hormone treatment, azoospermia (no sperm in ejaculate) or severe oligozoospermia (less than 3 million sperm per mL of semen), which is suffic...

New male contraceptive clears hurdle

...SUG study, doctors inject a gel into the tube that sperm travel through after they are produced (known as the vas deferens). The gel then disables the sperm as they swim by. In study animals, male fertility returns if the RISUG is flushed out with another i...

Clawed frog helps Fanconi anemia research make leaps

...n, by chemically activating the extract and adding sperm DNA from the male frog, the proteins in the extract unwind the DNA and the replication process is off and running under the watchful eyes of the researchers. "That's just the beginning of what we want to do with these extracts to study how the Fanc...

Researchers use 'trickery' to create immune response against melanoma

.... The prostate produces the seminal fluid in which sperm is transported. Prostate cancer begins with small changes in size and shape of the prostate gland cells which can develop into an uncontrolled growth of cells. Prostate cancer predominantly affects Western populations although the black population ...

Targeted drug delivery achieved with nanoparticle-aptamer bioconjugates

.... The prostate produces the seminal fluid in which sperm is transported. Prostate cancer begins with small changes in size and shape of the prostate gland cells which can develop into an uncontrolled growth of cells. Prostate cancer predominantly affects Western populations although the black population ...

The secret love life of plants

...ms a pollen tube. It then uses each one of its two sperm cells to fertilise the egg cell, from which the em..., the cdc2-plants develop pollen that has only one sperm cell instead of two. The researchers have now been exploring the question if whether, under these co...

UK sperm donor crisis

... ?especially students ?coming forward as potential sperm donors fell sharply after 2000, almost certainly d...owed that the number of men interested in donating sperm had declined significantly, with a consequent reduction in the number recruited. This fall could con...

Sperm stem cells closer to being like embryonic stem cells

New experiments that prevented rat sperm stem cells from changing permanently into sperm have brought researchers one step closer to coaxing such cells to behave like embryonic stem cells, ...

Sperm trading can resolve hermaphrodite mating conflicts

...ting conflicts by "trading sperm," that is, giving sperm only when the mating partner follows suit. However...of performing a "dry" copulation--that is, without sperm transfer. Sea slugs that mated with such a "cheating" partner interrupted sexual intercourse signifi...

A little telomerase isn't enough

...many times as they should and die early. Because sperm and egg arise from stem cells, too, their telomeres gradually shorten, and each successive generation starts out with chromosomes whose telomeres are even shorter than their parents, the researchers report. The failure of telomerase to lengthen these...

Cornell finds natural selection in humans

...team found that genes involved in immune function, sperm and egg production, sensory perception and transcription factors (proteins that control which genes are turned on or off) have been particularly affected by positive selection and show rapid evolution in the last 5 million years, when humans shared a...

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