Sperm News and Research

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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.

University of Washington team develops electrically spun cloth to prevent pregnancy, HIV

The only way to protect against HIV and unintended pregnancy today is the condom. It's an effective technology, but not appropriate or popular in all situations.

1 Dec 2012

Longer looks: Are 'pods' the solution to our long-term care crisis?; A Liver transplant in the nick of time; Pro-life activists and the abortion drop

In November 2006, when Clara Marshall began suffering from the effects of dementia, her family moved her into ... an assisted living home in Vancouver, Wash. ... just five months into her stay, Ms. Marshall, 81, was found dead in her room apparently strangled after getting her neck caught in side rails used to prevent her from rolling out of bed.

29 Nov 2012

Pachytene piRNAs play an essential role in protecting post-meiotic germ cells

Passing one's genes on to the next generation is a mark of evolutionary success. So it makes sense that the body would work to ensure that the genes the next generation inherits are exact replicas of the originals.

16 Nov 2012

Men with wider variation in sperm length have fertility problems

Perhaps variety is the very spice of life, but as a matter of producing human life, it could be the bane of existence. That's the indication of a new study in the journal Human Reproduction that found men with wider variation in sperm length, particularly in the flagellum, had lower concentrations of sperm that could swim well. Those with more consistently made sperm seemed to have more capable ones.

14 Nov 2012

Antioxidant imbalance in abnormal sperm

An imbalance exists in oxidative stress markers, such as reactive nitrogen species, reactive oxygen species, and total antioxidant capacity, in infertile men with abnormal semen parameters, report researchers.

13 Nov 2012

Sperm viability assessed in a number of UK fertility laboratories by using Linkam’s warm stages

Market leaders in temperature controlled microscopy, Linkam Scientific Instruments, have been chosen as suppliers of warm stages to a number of laboratories in the UK for sperm assessment.

From Linkam Scientific Instruments 7 Nov 2012

Oskar gene emerged far earlier in insect evolution than previously believed

Harvard scientists have solved the long-standing mystery of how some insects form the germ cells - the cellular precursors to the eggs and sperm necessary for sexual reproduction - and the answer is shedding new light on the evolutionary origins of a gene that had long been thought to be critical to the process.

2 Nov 2012

Physically active men produce better semen quality

A new study conducted by researchers at the University of Cordoba links moderate physical activity in males with better hormone levels and sperm characteristics that favour reproduction compared to sedentary men.

1 Nov 2012

IVF process negatively impacts women’s sexual relationships

An Indiana University study has found that women undergoing in-vitro fertilization report that the process of infertility treatment has many negative impacts on their sexual relationship with their partner. Little attention has been given to the sexual dynamics of couples as they navigate infertility and treatments such as IVF, despite the important role that sex plays in a couple's attempt to conceive a child.

30 Oct 2012

Project identifies mechanism behind rapid evolution of male genitals

A new collaborative project among researchers from Uppsala University in Sweden and the University of Cincinnati has, for the first time, demonstrated experimentally the evolutionary force behind the rapid evolution of male genitals, focusing on a species of seed beetle.

26 Oct 2012

Study to examine possible link between mitochondrial DNA and ovarian cancer

Ovarian cancer is a deadly disease. With no overt symptoms and no screening tests to catch it early, ovarian cancer is often detected at stage 3 or later. By then, it can be very aggressive and may have spread beyond the ovaries into other organs. Many women eventually succumb to it; the five-year survival rate for a stage 3 ovarian cancer diagnosis is only 34 percent.

24 Oct 2012

In vitro fertilization may significantly increase risk of birth defects

In vitro fertilization may significantly increase the risk of birth defects, particularly those of the eyes, heart, reproductive organs and urinary system, according to a new UCLA study.

23 Oct 2012

Male infertility linked to an enzyme complex issue

An enzyme complex present in sperm plasma membranes plays an important role in the overproduction of reactive oxygen species and oxidative stress in sperm with abnormal morphology, researchers have shown.

15 Oct 2012

Females having multiple sexual partners may be more fertile

Researchers have discovered that females that have multiple sexual partners can be more fertile than those that are monogamous and, very surprisingly, that this is the result of an "overproduction" of sons. The study - still only published as a provisional article but already one of the most accessed in BCM Evolutionary Biology - helps to explain a puzzle that has been haunting evolutionary biologist for decades: why during a mating season so many females chase multiple sexual partners when one is enough to fertilize all her eggs and to do it is costly and dangerous.

15 Oct 2012

Researchers discover how indoor mould makes people sick

For more than a decade, it has been known that the fungus Trichoderma longibrachiatum is the most common finding wherever people are suffering from health hazards related to damp building damage. However, it has not been known how this mould - which is typical of most buildings with indoor air problems - harms people's health. Published in September, a study by a team of researchers at the Department of Food and Environmental Sciences of the University of Helsinki explains how microbial metabolites in the living environment cause health problems

12 Oct 2012

Recombinant protein may treat male factor fertility

Male factor infertility resulting in failed oocyte activation from dysfunctional sperm phospholipase C-zeta may be remedied through the use of a recombinant form of the protein, leading to efficient blastocyst formation, say scientists.

8 Oct 2012

UMass Amherst biophysicist receives 2013 Margaret Oakley Dayhoff Award

University of Massachusetts Amherst biophysicist Jenny Ross has won one of the top national honors in her field, the 2013 Margaret Oakley Dayhoff Award, from the Biophysical Society of Rockville, Md. It is given to a woman who has achieved prominence for "substantial contributions to science," while showing very high promise for ideas and leadership in the early stages of her biophysical research career.

3 Oct 2012

Hormone and androgen receptor genes combined affect sperm motility

The combination of alleles for genes encoding the follicle-stimulating hormone receptor and androgen receptor has a significant impact on sperm motility, emphasising the importance of the genes in sperm quality, say Greek scientists.

1 Oct 2012

Male BMI effects embryo quality, IVF outcome

Male body mass index influences pregnancy outcome in couples undergoing in vitro fertilization through its effect on embryo quality rather than on sperm parameters, report researchers.

24 Sep 2012

Marijuana and testicular cancer: an interview with Victoria Cortessis

This is a set of malignancies that arise in germ cells of the testicles, the specialized cells that produce sperm. Taken together, testicular cancers are the most common form of malignancy that occurs in young men (approximately 15 to 35 years of age).

24 Sep 2012