Scientists believe sperm. Medical search. Frequent questions

In a cave in Australia, researchers from the University of New South Wales discovered giant fossilized sperm. (mongabay.com)
The researchers speculate the sperm were fossilized so well because they were buried in "tons" of bat guano, which preserved the sperm before they could decay. (mongabay.com)
Researchers in China say that they have discovered a way to make rudimentary mouse sperm in a dish, and used them to produce offspring. (scientificamerican.com)
But Takashi Shinohara, a reproductive biologist at Kyoto University in Japan, is among researchers who have doubts about the work: he notes that scientists have struggled to replicate several previous claims that sperm can be made in a dish. (scientificamerican.com)
Zhou says that the researchers are "very confident" that their protocol can be repeated in other laboratories-and that it would be normal for there to be variations between creating sperm in a dish and the process in live mice. (scientificamerican.com)
Researchers are working on a way to zap sperm to control male fertility. (time.com)
Rather than relying on samples that need to be shipped in glass vials and on ice, researchers have developed a new method that allows mouse sperm to be sent easily at room temperature using standard mail delivery. (the-scientist.com)
ABOVE: By freeze-drying mouse sperm on weighing paper and sandwiching the paper between protective plastic sheets, researchers were able to successfully mail the samples between labs in Japan. (the-scientist.com)
Until now, sending mouse sperm to other researchers has required a freezing environment such as liquid nitrogen or dry ice. (the-scientist.com)
The researchers managed to print viable testicular cells that they hope will eventually yield sperm from patients with forms of infertility that currently cannot be treated. (euronews.com)
Stem cells taken from an infertile patient's testicles didn't only survive inside the artificial tubes - they thrived and showed early signs of sperm-producing capabilities, the researchers said. (euronews.com)
But now, researchers are looking into both hormonal and non-hormonal contraceptives for sperm bearers. (wlrh.org)
During this phase, researchers are periodically monitoring the man's sperm count. (wlrh.org)
In the third and final phase, the man stops using the gel, and researchers begin to monitor his sperm count once again. (wlrh.org)
During a recent scientific expedition off the coast of Louisiana, researchers with were paid a surprise visit by a very welcome guest: a magnificent and humongous sperm whale. (iflscience.com)
Researchers brought us one step closer to understanding those early days by making a model of a human embryo in the lab, without using sperm or eggs . (yahoo.com)
The researchers, led by Palestinian scientist Jacob Hanna at the Weizmann Institute in Israel, harnessed the power of embryonic stem cells , which can become any kind of cell. (kion546.com)
Both the researchers and scientists not involved in the work emphasized that the models should not be considered human embryos. (kion546.com)
Using state-of-the-art 3D microscopy technology, our team of researchers from the UK and Mexico, were able to mathematically reconstruct the rapid movement of the sperm tail in 3D. (westernmorning.news)
While studying the sperm production of mice, the researchers discovered that Pumilio 1 controls eight cellular processes that interact with p53 in sperm production and when deleted in mice, sperm production and fertility are reduced. (scitechdaily.com)
Yale researchers have discovered how the "guardian of the genome" oversees quality control in the production of sperm - and perhaps in many other cells as well. (scitechdaily.com)
Here's how the researchers think plant sex goes down in the Camillia plant: The pollen grain attaches to the stigma situated on top of the pistil, which is about 1.2 inches (3 cm) long, and the tube grows all the way down to the ovary where it discharges the two sperm cells within an ovule. (livescience.com)
Rather than a sperm and an egg, the Israeli researchers used naïve stem cells, which they reprogrammed to give them the ability to become any type of tissue in the body. (techiai.com)
Other scientists suggested it would be difficult to determine what is happening with miscarriage - something the researchers hoped might be possible from studying the embryo model - when 99 percent of the cell mixture failed to assemble itself. (techiai.com)
Researchers at Georgetown University Medical Center have taken tissue from human testicles that produce sperm, grafted them onto diabetic mice and showed that blood sugar levels can be controlled for up to a week because they produce insulin. (sciencemediacentre.org)
COVID Could Impair Men's Sperm for Months: Study A COVID infection can reduce sperm count and hinder the ability of sperm to swim for at least 3 months, according to European researchers. (medscape.com)

Treatments such as in-vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI), where the sperm is placed into the egg rather than next to it, bypass the male problem rather than treating it, said Richard Sharpe, professor at the University of Edinburgh's center for reproductive health. (medscape.com)

By the act of generation nothing more is done than to ferment the sperm of ye female by the sperm of ye male that it may thereby become fit nourishment for ye Embryo: ffor ye nourishment of all animals is prepared by ferment & the ferment is taken from animals of the same kind, & makes the nourishment subtile & spiritual. (todayinsci.com)
The Embryo not being able to ferment its own nourishment w ch comes from the mothers blood has it fermented by the sperm w ch comes from ye fathers blood, & by this nourishment it swells, drops off from ye Ovarium & begins to grow with a life distinct from that of ye mother. (todayinsci.com)
Scientists built the model embryo, imaged here. (yahoo.com)
Scientists used stem cells to create a model of an embryo in the lab without sperm or egg. (yahoo.com)
Scientists understand surprisingly little about the early days of embryo growth , when our cells organize and begin to form our bodies. (yahoo.com)
Bangkok - Scientists have developed human embryo-like structures without using sperm, an egg or fertilization, offering hope for research on miscarriage and birth defects but also raising fresh ethical concerns. (kion546.com)
Our human model is the first three-lineage human embryo model that specifies amnion and germ cells, precursor cells of egg and sperm," Professor Magdalena Żernicka-Goetz, of the University of Cambridge at the International Society for Stem Cell Research's annual meeting in Boston. (thetatva.in)
Scientists have grown an entity that closely resembles an early human embryo, without using sperm, eggs or a womb," BBC writes. (e-militia.com)
Scientists created the world's first synthetic embryo from mouse stem cells, a scientific feat that could pave the way for the abolition of animal testing in medical research and the development of new treatments for patients. (estradeherald.com)
According to Scientists embryo stopped growing after eight days, which is equivalent to three months of pregnancy in a mouse. (estradeherald.com)
The other sperm cell fertilizes the central cell of the same ovule to give rise to the endosperm, a tissue the nourishes the growing embryo. (livescience.com)
Scientists have grown an entity very close to a human embryo - without using sperm, eggs or a womb. (techiai.com)
In vitro fertilization (IVF) involves combining an egg and sperm within a laboratory setting to create an embryo. (ivf.net)
However, changes made to genes in egg or sperm cells or to the genes of an embryo could be passed to future generations. (medlineplus.gov)

In search of a better option, a team of scientists in Japan recently sent mouse sperm that was freeze-dried onto simple weighing paper and stored between two plastic sheets by postcard roughly 200 kilometers, from Kyoto to Yamanashi, where the rehydrated sperm fertilized eggs and produced healthy baby mice. (the-scientist.com)
Their new method, detailed in a study published today (August 5) in iScience , builds on the team's previous work , which involved sending dehydrated mouse sperm stored in glass ampoules to the International Space Station to study how radiation affects mammalian cells. (the-scientist.com)
The freeze-drying technique of mouse sperm that we first reported is the only method that can be preserved at room temperature for one year using glass ampoules . (the-scientist.com)

Sea squirts spend most of their life clinging on to rocks, and many are broadcast spawners: females and males release eggs and sperm into the water, where they mix and fertilise. (newscientist.com)
They coaxed mouse embryonic stem cells to become cells that resembled primordial germ cells (PGCs)-an important stage in the development of both eggs and sperm. (scientificamerican.com)
Scientists at Stanford University in California have been able to coax embryonic stem cells into becoming eggs and sperm, which could one day lead to the creation of children through entirely artificial means. (womenofgrace.com)

Unfortunately, with current technology, the sperm becomes immobile after freeze-drying treatment, and micromanipulation is required to obtain the embryos, which is common to both conventional and new methods. (the-scientist.com)
Scientists aren't aiming to put any of these pseudo-embryos into humans, the BBC reported . (yahoo.com)
Chinese scientists have successfully created chimeric embryos containing a combination of human and pig cells. (bioedge.org)
A joint team of scientists from the US and the UK have created synthetic human embryos using stem cells, in a groundbreaking advance that sidesteps the need for eggs or sperm. (thetatva.in)
The rapid progress in this field has outpaced existing legislation, prompting scientists in the UK and other countries to establish voluntary guidelines for research on synthetic embryos. (thetatva.in)
The embryos created by scientists at Rehovot's Weizmann Institute of Science are referred to as "synthetic" because they were created without the use of an egg, sperm, or even a mouse's uterus. (estradeherald.com)
The experiment is yet another success in the ongoing race to create embryos from human and mouse stem cells, which the scientists at Weizmann Institute believe could hold the key to understanding how organs develop in embryos and one day creating replacement organs for transplant recipients. (estradeherald.com)
Have we stopped to consider boundaries as scientists' ability to transform stem cells into human organs, and even embryos, becomes more sophisticated and successful, achieving goals that were once thought to be impossible? (estradeherald.com)
The synthetic mouse embryos, despite resembling natural mouse embryos, could not be considered the same, according to Weizmann Institute scientists, and any attempt to implant them into a mouse's womb did not result in pregnancy. (estradeherald.com)
Scientists announced this week that they have successfully produced embryonic stem cells by transferring the DNA of human skin cells into unfertilized human eggs to produce embryos, a technique the Church considers to be an abuse of human life. (womenofgrace.com)

The modern freshwater ostracod Eucypris virens (1.5 millimeters long) also uses giant sperm cells for reproduction, although it is not a record holder with sperm being around 1.2 times as long as the male's body. (mongabay.com)
A coiled bundle of giant sperm cells from the male's seminal vesicle of the modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.com)
Giant sperm cells of a modern Australian salt lake ostracod, Mytilocypris mytiloides. (mongabay.com)
In contrast, the sperm cells of other animals, like these human sperm, have long tails. (mongabay.com)
Other scientists raise specific concerns that mainly relate to the timing of the processes that lead to the sperm cells. (scientificamerican.com)
Research by other scientists suggests that ultrasound may disrupt the proteins in cells and even their gene expression, leading to alterations in the way these cells work. (time.com)
In spite of the environment surrounding the germ cells being female, the fact that functional sperm has been made surprised me greatly. (discovermagazine.com)
Future research may investigate similar genes in mammals to see if we, too, have a sperm-suppressing gene that ensures our egg cells stay on track. (discovermagazine.com)
Scientists have 3D printed human testicular cells in the hope of helping men with fertility issues finally produce sperm. (euronews.com)
The cells were then grown and 3D-printed onto a Petri dish into a long and hollow structure similar to the seminiferous tubules that normally produce sperm. (euronews.com)
Better yet, they had grown into several of the specialised cells involved in sperm production and were showing a significant improvement in so-called spermatogonial stem cell maintenance - both early signs of sperm-producing capabilities. (euronews.com)
Flannigan told Euronews Next his team had done a longer culture of the cells for around 70 days - the time it normally takes humans to produce a fully functional sperm cell. (euronews.com)
The team is now actively working to "coach" the printed cells into producing sperm. (euronews.com)
Even if the cells don't reach the stage of full-grown sperm, it's hoped the research will help treat the patient by identifying what is blocking his sperm production. (euronews.com)
Leeuwenhoek's lenses made him the first explorer of the microscopic world, able to see objects including bacteria, the inside of our cells - and sperm. (westernmorning.news)
But when scientists first looked at how tumour cells respond to oestrogens there appeared to be a very specific and conserved pattern to the response, suggesting that it must be critical to the tumour cells. (thenakedscientists.com)
Instead of a sperm and egg, the starting material was naive stem cells which were reprogrammed to gain the potential to become any type of tissue in the body. (e-militia.com)
A total of 120 of these cells were mixed in a precise ratio - and then, the scientists step back and watch. (e-militia.com)
British scientists are hailing the recent creation of human sperm cells that they believe could revolutionize fertility treatment. (womenofgrace.com)
Sperm and other cells go through a sort of inspection process triggered by a key regulatory gene, p53, which orders the destruction of cells with damaged DNA. (scitechdaily.com)
As the tube - which contains the sperm cells - drills through the tissue of the female plant, the internal fluid pressure pushes out on these walls, keeping them rigid. (livescience.com)
When closed, it blocks the flow of sperm cells, allowing them to pass again when it is opened via a remote control. (medgadget.com)
Scientists at St. Jude Children's Research Hospital and the Broad Institute of MIT and Harvard used a next-generation genome editing technology, adenosine base editing, to restart fetal hemoglobin expression in SCD patient cells. (cdc.gov)
Most of the changes introduced with genome editing are limited to somatic cells, which are cells other than egg and sperm cells (germline cells). (medlineplus.gov)
Experts say that to address the basic unanswered clinical and scientific questions in andrology - the study of male reproductive health - would require research ranging from large, ideally international, epidemiological studies to detailed lab work to decipher exactly how sperm cells function. (medscape.com)
Every normal human cell, except for sperm and egg cells, has 23 pairs of chromosomes for a total of 46 chromosomes. (msdmanuals.com)
Sperm and egg cells have only one of each pair of chromosomes for a total of 23. (msdmanuals.com)
Except for certain cells (for example, sperm and egg cells and red blood cells), the cell nucleus contains 23 pairs of chromosomes. (msdmanuals.com)

A new study, published in Human Reproduction, found that exercise helps increase sperm motility. (bigthink.com)
It could be sperm count, but it could also be size, shape, or motility. (bigthink.com)
To impregnate a woman, three important factors were considered: sperm concentration, sperm morphology, and motility. (bigthink.com)
Those who exercised the most had the best sperm motility, while those who exercised least showed the worst results. (bigthink.com)
Of course, that might not be such bad advice, but why it might be reasonable advice has absolutely nothing to do with sperm counts, sperm motility, or infertility. (scienceblogs.com)

Spermatids are not mature sperm: they are round, rather than having sperm's elongated shape, and cannot swim. (scientificamerican.com)
In an attempt to accelerate the maturation of the testes and facilitate the study of spermatogenesis, several research groups have grafted NHP testis tissue onto nude mice and successfully obtained mature sperm. (asianscientist.com)
In the wild type donor group, we can get mature sperm in two years. (asianscientist.com)
A mature sperm whale has no natural predators, although calves and weakened adults are sometimes killed by pods of killer whales (orcas). (wikipedia.org)

His team in Vancouver has been using a 3D bioprinter to create life-size models of human seminiferous tubules - the structures inside the testicles that normally produce sperm. (euronews.com)
Note: The studies mentioned here are typically done on cisgender males between 18 and 50, so this story refers to the medications as "male contraception," and their target demographic as "men" or "males," though people of other genders can produce sperm. (wlrh.org)

Coverage follows recent news there has been an increase in Russian men freezing sperm ahead of conscription (see BioNews 1173 ). (progress.org.uk)

LONDON (Reuters) - They can make test-tube babies, grow human eggs in a lab and reproduce mice from frozen testicle tissue, but when it comes to knowing how a man's sperm can swim to, find and fertilize an egg, scientists are still floundering. (medscape.com)

experts define low sperm counts in men as anything less than 20 million sperm per milliliter of semen. (time.com)
A 2017 meta-analysis discovered that worldwide, the average sperm count dropped from 99 million sperm per milliliter in 1973 to 47 million in 2011. (bigthink.com)

Understanding the underlying differences between egg and sperm production can help scientists learn more about the evolution of sex itself, as well as potential ways to treat medical conditions such as infertility. (discovermagazine.com)
In the most severe form of male infertility, known as non-obstructive azoospermia (NOA), the production of sperm within seminiferous tubules fails, and no sperm is found in the ejaculate. (euronews.com)
Scientists have discovered that sperm contain two centrioles, as opposed to one - and that additional centriole could explain infertility. (lifeboat.com)
We know that sperm counts are dependent on high levels of testosterone, and there is some knowledge of links between sperm count and infertility, experts say. (medscape.com)
Scientists Solve the Genetic Puzzle of Sex-related Y Chromosome Scientists have taken an important step forward in understanding the human genome by fully deciphering the enigmatic Y chromosome, which could help guide research on infertility in men. (medscape.com)

Scientists Zap Sperm Counts with Ultrasound: Next Male Birth Control? (time.com)
Globally, sperm counts have gone down by over 50 percent over the last half-century. (bigthink.com)
Sperm counts in men from America, Europe, Australia and New Zealand have dropped by more than 50 percent in less than 40 years, according to pooled research published last year, described by one of its authors as an "urgent wake-up call" for further investigation. (medscape.com)
So while estimates suggest as many 1 in 20 young men now have sperm counts low enough to impair fertility, that remains educated assumption, rather than data from specific studies. (medscape.com)
Attracting funding for fundamental research into possible environmental impacts on sperm counts - chemical exposure, for example, or smoking, obesity, or sport and exercise - is tricky, partly because such studies need vast numbers of people, take many years and may not give clear answers. (medscape.com)

According to a marine biologist in California, this may be the first example of sperm competition between species. (newscientist.com)
A Japanese university and zoo are creating a sperm bank for endangered animals that could one day be used to bring extinct species back to life and even help to colonise other planets with Earth's rarest creatures. (telegraph.co.uk)
Prof. Kaneko began his research in mice and rats and was successful in breeding young of both species through artificial insemination from sperm that had been freeze-dried for five years. (telegraph.co.uk)
Sperm size varies with each species, with ostracods producing some of the largest sperm relative to body size of any animal. (mongabay.com)
However, the current record-holder for largest sperm goes to Drosophila bifurca , a species of fruit fly, whose sperm can be up to 5.8 centimeters (2.3 inches) long. (mongabay.com)
As yet, scientists aren't sure why giant sperm evolved, but speculate that it seems to have conferred significant advantageous as sperm gigantism evolved in many different species and in many different forms. (mongabay.com)
Biologically speaking, males are the members of a species that generate sperm while females produce eggs. (discovermagazine.com)
Sperm and egg samples from 6.7 million of Earth's species should be sent to an ark built on the moon as a 'modern global insurance policy', scientists have proposed. (climatedepot.com)
It is the only living member of the genus Physeter and one of three extant species in the sperm whale family, along with the pygmy sperm whale and dwarf sperm whale of the genus Kogia. (wikipedia.org)
Two species of the related extant genus Kogia, the pygmy sperm whale Kogia breviceps and the dwarf sperm whale K. sima, are placed either in this family or in the family Kogiidae. (wikipedia.org)
citation needed] The sperm whale is one of the species originally described by Carl Linnaeus in his landmark 1758 10th edition of Systema Naturae. (wikipedia.org)
Here's a powerful incentive for animals of separate species not to have sex: killer sperm. (newscientist.com)
It is the first instance of sperm causing physical harm to another species. (newscientist.com)
That may be because they do not have to deal with sperm jostling each other to reach the eggs, whereas in species that regularly mate, females have to evolve reinforced reproductive tracts to cope with the sperm. (newscientist.com)

He believes that's their best shot at inducing sperm production and paving the way to new fertility treatments. (euronews.com)

Now new data on rats shows that exposing testes to ultrasound can shut down sperm production - which could lead to an effective contraceptive. (time.com)
Tsuruta says when he compared rat testes exposed to ultrasound to testes heated to the same temperature without ultrasound, the ultrasound-treated testes showed a 10 times greater drop in sperm concentration. (time.com)
The sessions were enough to kill the existing sperm in the testes and stop the development of additional sperm. (time.com)
And since testosterone is necessary for sperm to reach maturation, the testes then produce fewer and fewer sperm. (wlrh.org)

In order to fit in their bodies, the sperm are kept tightly coiled in the males' sperm ducts until they're transferred to females, which collect 50 to 100 sperm in specific receptacles during a lengthy mating process. (mongabay.com)
Males produce millions of sperm every day. (time.com)
The scientists now suggest that trumpets are sounds made by maturing or mature males to interact with other males during foraging. (nature.com)

Just as there are reasons for this excessive drop in sperm count, there are means for raising them back up (well, at least their swimming abilities). (bigthink.com)

The results are super-exciting and important," says Jacob Hanna, a stem-cell scientist at the Weizmann Institute of Science in Rehovot, Israel. (scientificamerican.com)

I'm from Norway and it's very common for young, healthy men there to donate sperm. (bioedge.org)
The donor is being sued in a bid to prevent him from continuing to donate sperm. (yahoo.com)

Six healthy monkeys have been born using sperm grown from testis tissue transplanted onto the backs of mice. (asianscientist.com)
Live and apparently healthy monkeys have been born from sperm derived from xenografts grown on the backs of mice. (asianscientist.com)
So we think [obtaining xenografted sperm] mainly depends on the healthy condition of the nude mice," Sun told Asian Scientist Magazine . (asianscientist.com)
This implies that, for the time being, mice pups must still be created the old-fashioned way - egg, sperm, and all. (estradeherald.com)
By studying sperm production in mice, "we have identified p53's new boss, which controls p53 in a way that had been hypothesized before but had not been shown in any animal," said Haifan Lin, professor of cell biology and of genetics, director of the Yale Stem Cell Center, and senior author of the paper. (scitechdaily.com)
When Pumilio 1 is deleted in mice, sperm production and fertility are reduced because p53 becomes over active and orders the destruction of too many sperm. (scitechdaily.com)

Sperm Whale Mother and Calf. (nature.com)
The sperm whale or cachalot (Physeter macrocephalus) is the largest of the toothed whales and the largest toothed predator. (wikipedia.org)
The sperm whale is a pelagic mammal with a worldwide range, and will migrate seasonally for feeding and breeding. (wikipedia.org)
The sperm whale uses echolocation and vocalization with source level as loud as 236 decibels (re 1 µPa m) underwater. (wikipedia.org)
Spermaceti (sperm oil), from which the whale derives its name, was a prime target of the whaling industry, and was sought after for use in oil lamps, lubricants, and candles. (wikipedia.org)
The sperm whale is also known as the "cachalot", which is thought to derive from the archaic French for 'tooth' or 'big teeth', as preserved for example in the word caishau in the Gascon dialect (a word of either Romance or Basque origin). (wikipedia.org)
The sperm whale belongs to the order Cetartiodactyla,[excessive citations] the order containing all cetaceans and even-toed ungulates. (wikipedia.org)
In some taxonomic schemes the families Kogiidae and Physeteridae are combined as the superfamily Physeteroidea (see the separate entry on the sperm whale family). (wikipedia.org)

The sperm morphology, DNA integrity, and developmental potential after sheet preservation are comparable to those of conventional glass ampoules. (the-scientist.com)

If the claim stands up to scrutiny, it could point the way to making human sperm in the lab for fertility treatments. (scientificamerican.com)
Scientists in Canada are using a 3D bioprinter to try to replicate the complex inner mechanisms of human testicles and make sperm in a lab. (euronews.com)
To reproduce, human sperm have to swim a distance equivalent to climbing Mount Everest to find the egg. (westernmorning.news)
Though over 50 million sperm will fail to reach the egg - the equivalent to more than six times the entire population of London or New York - it only takes one single sperm in order to fertilise an egg that will eventually become a human being. (westernmorning.news)

The techniques of sperm analysis - examining ejaculate under a microscope, counting the sperm, assessing how well they swim, and seeing what they look like - were invented in the 1950s, he said. (medscape.com)

You were able to generate viable offspring after keeping the sperm at room temperature for three days, but not five. (the-scientist.com)
Some grafts survived for 17 months and viable sperm could still be obtained. (asianscientist.com)

ScienceBlogs is where scientists communicate directly with the public. (scienceblogs.com)

গবেষকদের দাবি, প্রত্যেক প্রাণীর শুক্রাণুর (sperm) আকার এবং প্রকৃতি আলাদা হয়। প্রত্যেকের ডিম্বাণু নিষেকের (fertilization) পদ্ধতি আলাদা আলাদা। ডিম্বাণুর সংস্পর্শে আসার পরই শুক্রাণু সবচেয়ে বেশি সক্রিয় হয়ে ওঠে। কিন্তু কী কারণে শুক্রাণুর এই বিভিন্নতা? (sdsmartupdate24.in)
Fertilization is the fusion between an ovum and a sperm cell. (bigthink.com)
IVF.net is a worldwide resource dedicated to scientists working in the field of In Vitro Fertilization (IVF). (ivf.net)

Sperm whales make a lot of noise. (nature.com)
Young and adult male sperm whales have been reported in the area since 1990, mostly during the summer while foraging" says Caterina Lanfredi, a researcher at the Tethys Research Institute and co-lead author of the study with Pace. (nature.com)
Sperm whales do deep dives in search of food, and this area represents the ideal habitat for their prey, mainly cephalopods that hide in submarine canyons," she notes. (nature.com)
During more than 700 hours of recordings, the scientists identified 230 trumpet sounds from 68 'trumpeter' whales. (nature.com)
The Mediterranean population of sperm whales is at risk of extinction, and understanding better their ecology and behaviour is critical for their conservation" says Lanfredi. (nature.com)
Sperm whales can live 70 years or more. (wikipedia.org)
Another synonym australasianus ('Australasian') was applied to sperm whales in the Southern Hemisphere. (wikipedia.org)

China Launches Campaign Against Illegal Fertility Treatments China will 'severely crack down' on illegal activities related to the use of assisted reproductive technologies such as the buying or selling of sperm or eggs and surrogacy, in a 6-month campaign to assuage widespread public concern. (medscape.com)

The Scientist spoke to Daiyu Ito, a reproductive biologist at the University of Yamanashi in Japan and the lead author on the study, via email about the challenges the team faced in developing the technique, and about what it will take to further refine the method for international shipping. (the-scientist.com)
The pups derived from sheet preserved sperm are healthy and reproductive. (the-scientist.com)
Not surprisingly, the nitty gritty cellular details of reproductive biology are thus of extreme interest to many scientists. (discovermagazine.com)
Without understanding the biology of how normal sperm work, we can't possibly understand how they don't work, or how to correct the problem," Sarah Martins Da Silva, a reproductive medicine specialist at the University of Dundee told a London briefing this week. (medscape.com)

Sperm "drills" into the fluid like a spinning top by rotating around itself whilst its tilted axis rotates around the centre. (westernmorning.news)

But some scientists are not convinced by the report, which is published today in Cell Stem Cell . (scientificamerican.com)

Scientists create an amazing 3D model of the heart's nervous system at the cellular level. (insidescience.org)

The sperm were produced 17 million years ago by a group of tiny, shelled crustaceans called ostracods, making them the oldest fossilized sperm ever found. (mongabay.com)
The fossil ostracod sperm were found in a cave in Queensland, a site that has been excavated for decades and which has yielded many fossils. (mongabay.com)
We found nature could not put an egg and sperm together, so we did it. (todayinsci.com)
The other half of the men, for whom no sperm can be found, currently don't have any option to have their own biological child. (euronews.com)
We found motile sperm after xenografting for ten months. (asianscientist.com)
The scientists also found evidence that some features of the sound change with intense social interactions. (nature.com)
While this should mean the sperm's one-sided stroke would have it swimming in circles, sperm have found a clever way to adapt and swim forwards: they roll as they swim, much like the way otters corkscrew through water. (westernmorning.news)
The study - by highly respected specialists - found that sperm levels of men who kept their phones in their pocket during the day were seriously affected in 47 per cent of cases compare to just 11 per cent in the general population. (scienceblogs.com)
Professor Martha Dirnfeld, of the Technion University in Haifa, said: "We analysed the amount of active swimming sperm and the quality and found that it had been reduced. (scienceblogs.com)

These models could help scientists understand what can go wrong early on in these developmental stages in order to try to prevent them, Hanna said in the press release. (yahoo.com)

Takehito Kaneko, an associate professor at the university, spent a decade perfecting a method of incorporating a buffer solution in the freeze-drying process to preserve the sperm at the same time as protecting the genetic information within the sample. (telegraph.co.uk)
for reasons that still remain somewhat of a mystery, one parent donates a much larger gamete, the egg, while the other donates only essential genetic material in the form of sperm. (discovermagazine.com)
Whether, or how, genetic variation can persist over the long haul remains a big question for scientists. (scitechdaily.com)
A blood test for pregnant women that could detect virtually any genetic disorder in an unborn child without risking miscarriage has been developed by scientists. (sciencemediacentre.org)

But now, scientists from Japan have shown that a female fish can produce fully-functioning sperm-and would all the time, if it weren't for the expression of a single gene. (discovermagazine.com)
They're interested in determining what regulates its expression as well as what the gene product actually does to prevent gametes from becoming sperm. (discovermagazine.com)
The gate keeping mechanism of micro-RNA Pumilio 1 on gene p53's action moderating its activity reminds the action of i-RNA (interfering RNA) on slicing mRNA where their actions are unwanted.The checks and counter-checks of nature to allow only the fittest one to survive is good but here in sperms they are bad in reducing fertility. (scitechdaily.com)
Genome editing (also called gene editing) is a group of technologies that give scientists the ability to change an organism's DNA. (medlineplus.gov)

What differences did you notice between the freeze-dried sperm [stored on the weighing paper] and control sperm, [which was freeze-dried but stored in glass]? (the-scientist.com)

In at least 40 percent of couples, sperm (or lack of) is the problem. (bigthink.com)

But when the opening was too narrow, the tubes simply burst - spewing their precious sperm cargo. (livescience.com)

Scientists hope to save them- As industry steps aside, scientists seek innovative ways to make sure expensive treatments can reach people who need them. (cdc.gov)

Xenograft-derived sperm where then injected into donor eggs and implanted into a total of 53 female surrogate monkeys. (asianscientist.com)
A scientist picks up a vial of frozen donor sperm samples. (yahoo.com)
A Dutch sperm donor who is accused of fathering 550 children is facing legal action aimed at stopping him from continuing to donate, over fears his prolific giving could increase the risk of accidental incest. (yahoo.com)
The Dutch News, which described Meijer as an "obsessive" sperm donor, said the Dutch gynecologists' society, NVOG, first issued a warning about Meijer in 2017. (yahoo.com)

11/04/2013) Based on a single tooth from Australia, scientists believe they have discovered a giant, meter-long (3.3 feet) duck-billed platypus that likely fed on fish, frogs, and even turtles, according to a new study in Journal of Vertebrate Paleontology . (mongabay.com)
The first study to look at the effect of ultrasound on sperm production, in the 1970s, showed that the depletion was temporary, and Tsuruta hopes his studies will show the same result. (time.com)
In the present study, Professor Sun Qiang and his team from the Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, have successfully generated six healthy cynomolgus monkeys ( Macaca fascicularis ) from xenograft-derived sperm. (asianscientist.com)
And when the tube encounters too tight a grip, it bursts and releases sperm, a new study reports. (livescience.com)
The new study shows that having a mobile phone close to the testicles - or within a foot or two of the body - can lower sperm levels so much that conceiving could be difficult. (scienceblogs.com)
US Sperm Banks Lack Racial, Ethnic Diversity, Study Shows A new study demonstrated significant underrepresentation of Hispanic and Black donors. (medscape.com)

Anyone using a modern microscope today still makes the very same observation: sperm swim forward by wiggling their tail from side-to-side. (westernmorning.news)
But as our latest research shows, we've actually been wrong about how sperm swim for the last 350 years. (westernmorning.news)
To increase chances of procreation, there needs to be a lot of swimmers, successful sperm have to have the right shape and size, and they have to know how to swim. (bigthink.com)

Sonicated' Sperm: Could Ultrasound Be the Next Male Contraceptive? (time.com)
But even more strangely, these female fish with no foxl3 expression began producing sperm only a week after hatching, a whole three weeks earlier than their wild male counterparts. (discovermagazine.com)
Male sperm count is declining globally. (bigthink.com)

For instance, in fruit flies, the sperm is almost all "tail," whereas ostracod sperm is all "head" and moves by rotating its body in a screw-like way. (mongabay.com)
We needed a super-fast camera capable of recording over 55,000 pictures in one second mounted in a fast oscillating stage to move the sample up and down at an incredibly high rate - effectively scanning the sperm tail while swimming freely in 3D. (westernmorning.news)
We discovered that the sperm tail is in fact wonky and only wiggles on one side. (westernmorning.news)
The sperm body spins at the same time that the tail rotates around the swimming direction. (westernmorning.news)
The scientific tale of the sperm tail follows the route of every other area of research: advances in understanding sperm movement are highly dependent upon the development of technologies in microscopy, recording and, now, mathematical modelling and data analysis. (westernmorning.news)

This method preserves the sperm samples very well and technically we believe it is possible to store them for decades or even longer into the future," he told The Daily Telegraph. (telegraph.co.uk)
He has now set his sights on collecting sperm samples from a range of larger animals that are also at risk of extinction, starting with elephants, tigers and rhinoceros. (telegraph.co.uk)
Freeze-drying of sperm has advantages over using liquid nitrogen as it does not require large amounts of bulky equipment and samples can be stored in a regular refrigerator. (telegraph.co.uk)
W ith mouse models undergirding so much scientific research, scientists have a vested interest in developing techniques to safely store and transport sperm samples between labs. (the-scientist.com)
Drying the samples, the authors say, does away with the need for cold storage, and they've since refined the method further so that they can store sperm from thousands of different mouse strains in a single three-ring binder. (the-scientist.com)
Thousands of sperm samples were analyzed. (bigthink.com)
Scientist Propose an "Noah's Ark" with almost 7 Million Sperm samples Stored away for Global insurance. (civiliantalkpodcast.com)

These data are in stark contrast to previous research in mammals , as they suggest that the 'default' track for gametes is to become sperm rather than eggs. (discovermagazine.com)
The research was welcomed by some scientists as an "impressive" advance that could help unlock secrets about the precarious early stages of pregnancies, when failure is most common. (kion546.com)
Though scientists now better understand the role that sperm plays in reproduction, our latest research has discovered that sperm have actually been fooling scientists this whole time. (westernmorning.news)
A niche research community plays out what existence might be like on, or en route to, another planet. (popsci.com)

Anatomy23

Organisms9

Diseases8

Chemicals and Drugs14

Analytical, Diagnostic and Therapeutic Techniques and Equipment25

Psychiatry and Psychology11

Phenomena and Processes27

Disciplines and Occupations37

Anthropology, Education, Sociology and Social Phenomena32

Technology, Industry, Agriculture10

Humanities30

Information Science38

Named Groups7

Health Care34

Geographicals1

Researchers26

Intracytoplasmic Sperm Inj1

Embryo14

Mouse sperm3

Eggs and sperm3

Embryos10

Cells28

Motility5

Mature sperm4

Produce sperm2

Increase in Ru1

Man's sperm1

Million sperm per milliliter2

Infertility5

Counts5

Species14

Inducing sperm production1

Testes4

Males3

Drop in sperm1

Weizmann Institu1

Donate sperm2

Mice6

Whale8

Morphology1

Human4

Ejaculate1

Viable2

ScienceBlogs1

Fertilization3

Whales7

Surrogacy1

Reproductive4

Drills1

Stem Cell1

Create1

Found9

Help scientists1

Genetic4

Gene4

Freeze-dried1

Couples1

Precious1

Treatments1

Donor4

Study6

Swim3

Male3

Tail5

Samples7

Research4