http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. (PhysOrg.com) -- Scientists have found new evidence to explain how female insects can influence the father of their offspring, even after mating with up to ten males. A team from the University of Exeter has found that female crickets are able to control the amount of sperm that they store from each mate to select the best father for their young. http://www.physorg.com/news171627059.html Biology Tue, 08 Sep 2009 11:11:41 EST news171627059 (PhysOrg.com) -- Biologists at the University of California, Riverside report new evidence for evolutionary change recorded in both the fossil record and the genomes (or genetic blueprints) of living organisms, providing fresh support for Charles Darwin's theory of evolution. http://www.physorg.com/news171272885.html Biology Fri, 04 Sep 2009 08:50:08 EST news171272885 Canada should extend universal health coverage to fund in vitro fertilization (IVF) and intracytoplasmic sperm injection, writes Dr. Renda Bouzayen, Division Head, Reproductive Endocrine and Infertility, Dalhousie University in an editorial with the CMAJ (Canadian Medical Association Journal) editorial writing team. http://www.physorg.com/news170941529.html Medicine & Health Mon, 31 Aug 2009 13:50:01 EST news170941529 A Tunisian woman is due to give birth to 12 babies, which could be a world record, press reports said Tuesday, quoting doctors. http://www.physorg.com/news169814948.html Medicine & Health Tue, 18 Aug 2009 11:50:18 EST news169814948 The promise of stem cell therapy may lie in uncovering how adult cells revert back into a primordial, stem cell state, whose fate is yet to be determined. Now, cell scientists at the Johns Hopkins University School of Medicine have identified key molecular players responsible for this reversion in fruit fly sperm cells. Reporting online this week in Cell Stem Cell, researchers show that two proteins are responsible redirecting cells on the way to becoming sperm back to stem cells. http://www.physorg.com/news168788764.html Biology Thu, 06 Aug 2009 15:00:01 EST news168788764 Scientists at Leeds and Bradford have discovered a unique 'DNA signature' in human sperm, which may act as a key that unlocks an egg's fertility and triggers new life. http://www.physorg.com/news168510810.html Biology Mon, 03 Aug 2009 09:34:29 EST news168510810 (AP) -- A scientific journal has retracted a controversial paper claiming to have created the first human sperm from embryonic stem cells. http://www.physorg.com/news168255239.html Biology Fri, 31 Jul 2009 10:34:29 EST news168255239 Couples struggling with fertility problems have a new option for assessing their ability to have a child with the start-up of a new Buffalo-based company called LifeCell Dx, Inc. (LCDX). http://www.physorg.com/news167922173.html Medicine & Health Mon, 27 Jul 2009 14:20:02 EST news167922173 (PhysOrg.com) -- A genetic mutation that lies behind one type of male infertility has been discovered by researchers at Oxford University, Ghent University in Belgium, and the University of Massachusetts, Amherst in the USA. http://www.physorg.com/news167401452.html Medicine & Health Tue, 21 Jul 2009 14:00:02 EST news167401452 (PhysOrg.com) -- Researchers have discovered that the sea lamprey, which emerged from jawless fish first appearing 500 million years ago, dramatically remodels its genome. Shortly after a fertilized lamprey egg divides into several cells, the growing embryo discards millions of units of its DNA. http://www.physorg.com/news167325215.html Biology Mon, 20 Jul 2009 16:14:13 EST news167325215 (PhysOrg.com) -- Attractive males release fewer sperm per mating to maximise their chances of producing offspring across a range of females, according to a new paper on the evolution of ejaculation strategies. The findings by researchers at UCL (University College London) and the University of Oxford suggest that, paradoxically, matings with attractive males may be less fertile than those with unattractive ones. http://www.physorg.com/news166354811.html Biology Thu, 09 Jul 2009 10:40:43 EST news166354811 (PhysOrg.com) -- Human sperm have been created using embryonic stem cells for the first time in a scientific development which will lead researchers to a better understanding of the causes of infertility. http://www.physorg.com/news166248285.html Biology Wed, 08 Jul 2009 05:07:07 EST news166248285 (PhysOrg.com) -- The seemingly effortless way dolphins and porpoises slice through the water and the unique capabilities of the supersonic Concorde airplane have more in common than one might think. http://www.physorg.com/news165592631.html Biology Tue, 30 Jun 2009 14:57:44 EST news165592631 Daily sex (or ejaculating daily) for seven days improves men`s sperm quality by reducing the amount of DNA damage, according to an Australian study presented today (Tuesday) to the 25th annual meeting of the European Society of Human Reproduction and Embryology in Amsterdam. http://www.physorg.com/news165567458.html Medicine & Health Tue, 30 Jun 2009 07:58:23 EST news165567458 Analysis of the longest running ICSI programme in the United States has found reassuring evidence that babies born from frozen embryos fertilised via ICSI (intracytoplasmic sperm injection) do just as well as those born from frozen embryos fertilised via standard IVF treatment. http://www.physorg.com/news165493995.html Medicine & Health Mon, 29 Jun 2009 12:40:01 EST news165493995 The high-intensity training undertaken by triathletes has a significant impact on the quality of their sperm, the 25th annual conference of the European Society of Human Reproduction and Embryology heard today (Monday 29 June). Professor Diana Vaamonde, from the University of Cordoba Medical School, Cordoba, Spain, said that the triathletes who did the most cycling training had the worst sperm morphology. http://www.physorg.com/news165493540.html Medicine & Health Mon, 29 Jun 2009 11:26:06 EST news165493540 Contrary to predictions, males of high genetic quality are not very successful when it comes to fertilizing eggs. A new study on seed beetles by Swedish and Danish scientists Göran Arnqvist and Trine Bilde shows that when a female mates with several males, the males of low genetic quality are the most successful in fertilizing eggs. The study is published in this week's issue of Science. http://www.physorg.com/news165158293.html Biology Thu, 25 Jun 2009 15:10:06 EST news165158293 The mystery of giant sperm present in some living animal groups today has now taken on a new dimension -- in one group of micro-crustaceans new evidence shows that it is a feature at least 100 million years old. http://www.physorg.com/news164553484.html Biology Thu, 18 Jun 2009 14:18:24 EST news164553484 Jumping genes do most of their jumping, not during the development of sperm and egg cells, but during the development of the embryo itself. The research, published this month in Genes and Development, "challenges standard assumptions on the timing of when mobile DNA, so-called jumping genes, insert into the human genome," says senior author Haig H. Kazazian Jr., MD, Seymour Gray Professor of Molecular Medicine in Genetics at the University of Pennsylvania School of Medicine. http://www.physorg.com/news163989429.html Medicine & Health Fri, 12 Jun 2009 07:00:01 EST news163989429 While fatherhood might be far from the minds of most young men, behavior patterns they establish early on may impact their ability to become a dad later in life. Excessive laptop use tops this list of liabilities, according to one reproductive specialist at Loyola University Health System (LUHS). http://www.physorg.com/news163991430.html Medicine & Health Fri, 12 Jun 2009 05:10:01 EST news163991430 Researchers have known for more than half a century that sperm is able to fertilize an egg only after it has resided for a period of time in the female reproductive tract. Without this specific interaction with the female body, the sperm is incapable of producing offspring. But until now there was very little understanding of what changes occur within the sperm that suddenly allows it to fertilize an egg. http://www.physorg.com/news163780913.html Medicine & Health Tue, 09 Jun 2009 15:42:12 EST news163780913 No human is a clone of their parents but the same cannot be said for other living things. While your DNA is a combination of half your mother and half your father, other species do things differently. The advantage of clonal reproduction is that it produces an individual exactly like an existing one -which would be very useful for farmers who could replicate the best of their animals or crops without the lottery of sexual reproduction. Clonal reproduction of crop species took a step closer to being realised with new research published in PLoS Biology this week. http://www.physorg.com/news163736388.html Biology Tue, 09 Jun 2009 03:21:05 EST news163736388 For decades scientists have been intrigued by the variety of sounds emitted by sperm whales, partly due to a popular theory that suggests that the sounds might contain information about the animals' size. But historically it has been extremely difficult to demonstrate that these curious clicking noises can reveal information about the physical characteristics of the massive marine mammals. Now, researchers at Scripps Institution of Oceanography at UC San Diego are unlocking some of the mysteries of sperm whale sound production. http://www.physorg.com/news162142273.html Biology Thu, 21 May 2009 16:32:57 EST news162142273 Business is booming for the world's biggest sperm bank, Denmark's Cryos, which is struggling to meet demand despite a soaring number of donors and new offices opening around the world. http://www.physorg.com/news161596184.html Medicine & Health Fri, 15 May 2009 09:01:56 EST news161596184 Wall Street giants are not the only banks hit by diminishing assets. New research for an Israeli sperm bank shows that depositors are 40 per cent less fertile than a decade ago, the Haaretz daily reported. http://www.physorg.com/news161258349.html Medicine & Health Mon, 11 May 2009 10:59:27 EST news161258349 (PhysOrg.com) -- Scientists are investigating whether or not noise generated by the oil and gas industry might affect the day-to-day behaviour of sperm whales. http://www.physorg.com/news160934516.html Biology Thu, 07 May 2009 17:02:55 EST news160934516 A new study reveals that - contrary to decades of evolutionary thought - chromosome regions that are prone to breakage when new species are formed are a rich source of genetic variation. http://www.physorg.com/news159715581.html Biology Thu, 23 Apr 2009 14:26:44 EST news159715581 (PhysOrg.com) -- Understanding how living cells originated and evolved into their present forms remains a fundamental research area in biology, one boosted in recent years by the introduction of new tools for genomic analysis. Now, researchers at MIT and Boston University have used such tools to put what they say is "the last nail in the coffin" for one theory about the origin of a basic structure in the cell. http://www.physorg.com/news159635938.html Biology Wed, 22 Apr 2009 16:19:47 EST news159635938 An Emory University study shows some of the first direct evidence of a process required for epigenetic reprogramming between generations - a finding that could shed more light on the mechanisms of fertilization, stem-cell formation and cloning. The journal Cell published the results of the study on the nematode C. elegans in its April 17 issue. http://www.physorg.com/news159106629.html Biology Thu, 16 Apr 2009 13:17:39 EST news159106629 University of Nevada School of Medicine scientists in the Department of Physiology and Cell Biology have discovered insight into the reproductive workings of the male sex chromosome that may have significant implications for male infertility and contraception. http://www.physorg.com/news158502651.html Biology Thu, 09 Apr 2009 13:31:21 EST news158502651