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The term sperm refers to the male reproductive cells. In the types of sexual reproduction known as anisogamy and oogamy, there is a marked difference in the size of the gametes with the smaller one being termed the "male" or sperm cell. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell.
Starvation can affect health of descendants of famished individuals

Starvation can affect health of descendants of famished individuals

Evidence from human famines and animal studies suggests that starvation can affect the health of descendants of famished individuals. But how such an acquired trait might be transmitted from one generation to the next has not been clear. [More]
Research findings provide promising news for couples considering in-vitro fertilization

Research findings provide promising news for couples considering in-vitro fertilization

Using computer-automated, time‐lapse photography of embryos in the laboratory during in-vitro fertilization may improve embryo selection, potentially increasing the chances of pregnancy among women undergoing the procedure, according to new research from the Perelman School of Medicine at the University of Pennsylvania and five other fertility centers. [More]
Age of sperm donor does not affect outcome in terms of live birth

Age of sperm donor does not affect outcome in terms of live birth

Despite emerging evidence of a decline in sperm quality with increasing age, an analysis of every first fertility treatment cycle performed in the UK using sperm donation shows that outcome in terms of live birth is not affected by the age of the sperm donor. [More]
New discovery reveals relationship between certain proteins and juvenile myoclonic epilepsy

New discovery reveals relationship between certain proteins and juvenile myoclonic epilepsy

New structures discovered within cilia show a relationship between certain proteins and juvenile myoclonic epilepsy. The discovery, made at the University of Minnesota, was named paper of the week in the Journal of Biological Chemistry, and sheds new light on the microstructure of cilia. [More]
Fragile Y hypothesis explains the factors behind chromosome loss

Fragile Y hypothesis explains the factors behind chromosome loss

A UT Arlington research team says their study of genetic information from more than 4,000 beetle species has yielded a new theory about why some species lose their Y chromosome and others, such as humans, hang on to it. [More]
Scientists advise caution with regard to artificial insemination method

Scientists advise caution with regard to artificial insemination method

Mitochondria are cell organelles located within animal and human cells. They produce energy for the organism, possess their own genetic material - mitochondrial DNA (mtDNA) - and are transmitted exclusively by the mother. Depending on their activity and tasks, different numbers of mitochondria are present in a cell - usually a few hundred to a thousand per body cell. [More]
Researchers uncover key biological interaction that occurs during fertilization

Researchers uncover key biological interaction that occurs during fertilization

Before it can fertilize an egg, a sperm has to bind to and bore through an outer egg layer known as the zona pellucida. Despite decades of research, some of the biological mechanisms behind this process remain unclear. A study in The Journal of Cell Biology now identifies the protein in the zona pellucida that sperm latch onto. [More]
Researchers examine role of female sex hormones in male obesity

Researchers examine role of female sex hormones in male obesity

An imbalance of female sex hormones among men in Western nations may be contributing to high levels of male obesity, according to new research from the University of Adelaide. [More]
Study examines effect of phthalate exposure in humans’ sperm epigenetics

Study examines effect of phthalate exposure in humans’ sperm epigenetics

A new three-year, $440,000 study led by environmental health scientist Richard Pilsner at the University of Massachusetts Amherst is now underway to investigate whether phthalate levels in expectant fathers have an effect on the couples' reproductive success, via epigenetic modifications of sperm DNA. [More]
Modified mosquitoes produce sperm that only creates males

Modified mosquitoes produce sperm that only creates males

Scientists have modified mosquitoes to produce sperm that will only create males, pioneering a fresh approach to eradicating malaria. [More]
Auxilium and Prasco introduce authorized generic version of Testim

Auxilium and Prasco introduce authorized generic version of Testim

Auxilium Pharmaceuticals, Inc., a fully integrated specialty biopharmaceutical company, today announced that it has partnered with Prasco, LLC ("Prasco") to introduce an Authorized Generic version of Testim® (testosterone gel). [More]
Cannabis use affects size and shape of sperm in young men

Cannabis use affects size and shape of sperm in young men

Young men who use cannabis may be putting their fertility at risk by inadvertently affecting the size and shape of their sperm according to research published today (Thursday 5 June 2014). [More]
Scientists define genetic cause for two types of birth defects in newborn boys

Scientists define genetic cause for two types of birth defects in newborn boys

Baylor College of Medicine scientists defined a previously unrecognized genetic cause for two types of birth defects found in newborn boys, described in a report published today in the journal Nature Medicine. [More]
Particular genetic variation in humans linked with blond hair

Particular genetic variation in humans linked with blond hair

A single-letter change in the genetic code is enough to generate blond hair in humans, in dramatic contrast to our dark-haired ancestors. [More]
Experts from ProfNet network available to discuss timely issues in coverage area

Experts from ProfNet network available to discuss timely issues in coverage area

Below are experts from the ProfNet network that are available to discuss timely issues in your coverage area. If you are interested in interviewing any of the experts, please contact them via the contact information at the end of the listing. [More]
New insights into egg selection may have broad implications for women's health, fertility

New insights into egg selection may have broad implications for women's health, fertility

A woman's supply of eggs is a precious commodity because only a few hundred mature eggs can be produced throughout her lifetime and each must be as free as possible from genetic damage. [More]
Men who feel stressed have fewer, slower sperm

Men who feel stressed have fewer, slower sperm

Psychological stress is harmful to sperm and semen quality, affecting its concentration, appearance, and ability to fertilize an egg, according to a study led by researchers Columbia University's Mailman School of Public Health and Rutgers School of Public Health. [More]
Sex cell determination requires maintenance throughout life

Sex cell determination requires maintenance throughout life

The way in which the sex of an organism is determined may require lifelong maintenance, finds new research from the University of Minnesota. [More]
Separating sperm and eggs from somatic cells preserves genetic building blocks

Separating sperm and eggs from somatic cells preserves genetic building blocks

We have hundreds of types of cells in our bodies - everything from red blood cells to hair follicles to neurons. But why can't most of them create offspring for us? [More]
Scientists uncover early steps of totipotency in sperm precursors

Scientists uncover early steps of totipotency in sperm precursors

In the body, a skin cell will always be skin, and a heart cell will always be heart. But in the first hours of life, cells in the nascent embryo become totipotent: they have the incredible flexibility to mature into skin, heart, gut, or any type of cell. [More]