Sperm News and Research

RSS

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.

Male contraception

For decades, pundits have predicted new contraceptives for men within the next 5 to 10 years.

29 Sep 2007

Study looks at mitochondrial variation in sperm traits and sperm competitive ability

University of Nevada, Reno researchers Jeanne and David Zeh of the Department of Biology have received a five-year, $650,000 grant from the National Science Foundation to investigate the effects of natural mitochondrial variation on sperm traits and sperm competitive ability.

20 Sep 2007

Testes offer a promising new source of stem cells

After a decade of research, Howard Hughes Medical Institute scientists have succeeded in reprogramming adult stem cells from the testes of male mice into functional blood vessels and contractile cardiac tissue.

20 Sep 2007

New cell death pathway involved in sperm development

Heavy and bulky sperm would not be good swimmers. To trim down, sperm rely on cell death proteins called caspases, which facilitate the removal of unwanted cellular material and radically remodel these cells into their sleek, light shape.

18 Sep 2007

New understanding of immune infertility

Most of us have never heard of immune infertility, yet it prevents many prospective parents from conceiving. Immune infertility is one of 80 autoimmune disorders, a group that includes better-known diseases like Multiple Sclerosis and Type 1 Diabetes.

13 Sep 2007

One species' entire genome discovered inside another's

Scientists at the University of Rochester and the J. Craig Venter Institute have discovered a copy of the entire genome of a bacterial parasite residing inside the genome of its host species.

30 Aug 2007

New research findings on Apert's syndrome

Aperts syndrome is a condition caused by a mutation that produces fused fingers and toes, and alters cranial development in affected children.

28 Aug 2007

Human testes may act as mutation multipliers

The testes in humans may act as mutation multipliers that raise the odds of passing improved DNA to offspring - but that can also backfire by increasing the frequency of certain diseases.

28 Aug 2007

Smoking turns on genes

Smoking tobacco is no longer considered sexy, but it may prove a permanent turn on for some genes.

26 Aug 2007

Gene use sets humans and chimps apart

The striking differences between humans and chimps aren't so much in the genes we have, which are 99 percent the same, but in the way those genes are used, according to new research from a Duke University team.

13 Aug 2007

New insights into cell division process

Which genes are passed on from mother to child is decided very early on during the maturation of the egg cell in the ovary.

12 Aug 2007

First case of successful ovarian tissue transplantation between two, nonidentical sisters

A woman, whose ovaries had failed due to damage caused by chemotherapy and radiotherapy, has received a successful ovarian transplant from her genetically non-identical sister.

3 Aug 2007

Woman has successful ovarian transplant from her sister

A woman whose ovaries were damaged by chemotherapy and radiotherapy, has received a successful ovarian transplant from her sister.

1 Aug 2007

Discovery of pathway that controls cell size and division

Organisms precisely regulate cell size to ensure that daughter cells have sufficient cellular material to thrive or to create specific cell types: a tiny sperm versus a gargantuan egg for example.

1 Aug 2007

Bone marrow restores fertility in female mice

A new study from Massachusetts General Hospital (MGH) researchers confirms that female mice that receive bone marrow transplantation after fertility-destroying chemotherapy can go on to have successful pregnancies throughout their normal reproductive life.

31 Jul 2007

The future of Alzheimer's disease research

Imagine the day when a routine visit to the family doctor includes a simple blood test to predict the risk for developing Alzheimer's disease (AD).

26 Jul 2007

Implantable contraceptives are extremely effective

Although the devices are barely used in developed countries and only a bit more popular elsewhere, a new review of research suggests that implantable contraceptives are extremely effective.

25 Jul 2007

Sperm freezing for young male cancer patients

A recent study at Hamilton Health Sciences proves that sperm freezing and banking is an effective way to preserve fertility in adolescents and young adult (AYA) males with cancer.

23 Jul 2007

Study reveals surge in male-factor infertility technique

A national study reveals that the use of intracytoplasmic sperm injection or ICSI -- an assisted reproductive technology used to treat male-factor infertility -- has increased dramatically in the United States since 1995, while the proportion of patients receiving treatment for male-factor infertility has remained stable.

18 Jul 2007

Men physcologically affected by fertility problems as much as women

Although most psychosocial research into infertility is centred round the unhappiness it causes women, men suffer just as much, a scientist will tell the 23rd annual conference of the European Society of Human Reproduction and Embryology today (Wednesday 4 July).

4 Jul 2007