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.

Human bone marrow has been used to create early-stage sperm cells

For the experiment, Prof Nayernia and his team took bone marrow from male volunteers and isolated the mesenchymal stem cells. These cells have previously been found to grow into other body tissues such as muscle.

15 Apr 2007

Analysis of Rhesus monkey genome provides new clues to primate biology

An international consortium of researchers has published the genome sequence of the rhesus macaque monkey and aligned it with the chimpanzee and human genomes.

12 Apr 2007

Genetic mutation that prevents sperm production found

Up to 15 percent of couples of childbearing age struggle with the heartache of infertility.

11 Apr 2007

Smoking may influence sex of unborn babe

A study by British pediatricians suggests that smoking cigarettes can influence the gender of an unborn baby.

11 Apr 2007

Men and women who wait to have babies later in life may increase their children's risk for autism

The study investigated 132,844 children born at Kaiser Permanente hospitals in its Northern California region over a five-year period (1995-1999) and identified 593 children who had been diagnosed with an autism spectrum disorder (ASD).

4 Apr 2007

Environmental contamination could affect the evolution of wildlife through changes in mating behavior

Female rats avoid males whose great-grandfathers were exposed to a common fruit crop fungicide, preferring instead males whose ancestors were uncontaminated, researchers from The University of Texas at Austin have discovered.

2 Apr 2007

Maternal beef consumption associated with lower sperm concentration

New research has shown that women who ate a lot of beef while pregnant had sons who were more likely to suffer from poor sperm quality as adults, and it suggests that the growth promoters used in cattle may play a role in these men's reduced fertility.

2 Apr 2007

California Senate Committee approves bill that would allow HIV-positive men to have sperm washed

The California Senate Health Committee on Wednesday voted unanimously to approve a bill (SB 443) that would allow HIV-positive men to have their sperm washed and used for fertility treatments, including artificial insemination and in vitro fertilization, under certain guidelines, the San Francisco Chronicle reports.

2 Apr 2007

Mother's high beef consumption while pregnant associated with lower sperm counts in her son

Researchers sought to examine the relationship between semen quality and long-term risks from growth hormones and other chemicals in beef.

28 Mar 2007

Exposure to phthalates linked to abdominal obesity and insulin resistance in adult males

Exposure to phthalates, a common chemical found in everything from plastics to soaps, already has been connected to reproductive problems and now, for the first time, is linked to abdominal obesity and insulin resistance in adult males, according to a study by the University of Rochester Medical Center.

14 Mar 2007

California Sen. Carole Migden introduces bill to allow HIV-positive men to use reproductive services

California Sen. Carole Migden (D) recently introduced a bill (SB 443) that would allow HIV-positive men to use reproductive services, including artificial insemination and in vitro fertilization, under certain guidelines, the MediaNews/San Jose Mercury News reports.

8 Mar 2007

Would be dads advised to stay out of the hot tub

The team led by Dr. Paul J. Turek, a urologist and professor at the University of California, San Francisco, say hot baths can lead to male infertility.

5 Mar 2007

Steroid use fails to boost pregnancy rates in infertility treatments

There is no clear benefit from a hormone commonly prescribed to enhance the effectiveness of infertility treatments, according to a new review of studies.

1 Mar 2007

Increased demand, compensation for egg donors in U.S.

The AP/Boston Globe on Monday examined how increased demand for egg donations and compensation for donors in the U.S. has prompted more young women to donate their eggs. According CDC data, about 10,000 women donated eggs to federally monitored programs in 2004, compared with 3,800 women in 1996.

22 Feb 2007

Women in the UK to trade eggs for IVF treatment

According to the fertility regulator in the UK women there will soon be able to donate their eggs for medical research.

21 Feb 2007

Researchers replace organ in mice using 'single-parent' stem cells

Researchers at the University of Pennsylvania School of Veterinary Medicine have derived uniparental embryonic stem cells - created from a single donor's eggs or two sperm - and, for the first time, successfully used them to repopulate a damaged organ with healthy cells in adult mice.

18 Feb 2007

Vasectomy linked to dementia

Researchers in the United States have linked male sterilization surgery to a certain form of dementia.

14 Feb 2007

Vasectomy and trouble with words

Northwestern University researchers have discovered men with an unusual form of dementia have a higher rate of vasectomy than men the same age who are cognitively normal.

13 Feb 2007

Sperm competition phenomenon

In the context of sexual reproduction, natural selection is generally thought of as a pre-copulation mechanism. We are drawn to features of the human body that tell us our partner is healthy and will provide us a fighting opportunity to carry on our genetic lineage.

11 Feb 2007

Young single men are more likely to bank sperm before testicular cancer treatment

A quarter of men with testicular cancer banked their sperm before treatment, but only six per cent of those actually used the sperm to father a child, according to a study published in the January issue of the UK-based urology journal BJU International.

8 Jan 2007