News tagged with sperm
Despite most parents ultimately just wishing for a healthy baby, there are many cultural and social factors that can drive the desire for a baby of a particular sex.
Health Apr 17, 2013 | not rated yet | 0
The results may help to explain why certain medications have strong side effects on sperm and eggs, and why certain organisms remain unaffected by environmental changes. This is shown by studies that researchers from the ...
Genetics Apr 10, 2013 | not rated yet | 0
Problems in accessing donor sperm and eggs at home appear to be behind a reported increase in the number of UK citizens who seek fertility treatment abroad, despite the fact that this is widely seen as risky. ...
Other Mar 20, 2013 | not rated yet | 0
The amount of perfluorooctanoic acid (PFOA) that mothers had in their blood during pregnancy affected their sons' semen quality at 20 years old. These findings appear in a recent study from Aarhus University ...
Health Mar 20, 2013 | not rated yet | 0
As success rates in treating childhood cancers have improved, greater emphasis is being placed on quality of life issues following successful treatment. Many cancer treatments can lead to infertility, but there are few methods ...
Cancer Mar 15, 2013 | 5 / 5 (1) | 0
(HealthDay)—Serum levels of follicle-stimulating hormone (FSH) and inhibin B are not good predictors of sperm levels in male survivors of childhood cancer, according to a study published online Feb. 19 ...
Cancer Mar 08, 2013 | 5 / 5 (1) | 0
A father's obesity is one factor that may influence his children's health and potentially raise their risk for diseases like cancer, according to new research from Duke Medicine.
Overweight and Obesity Feb 05, 2013 | not rated yet | 0
Men's sperm quality may be significantly affected by their levels of physical activity, according to a new study led by researchers at Harvard School of Public Health (HSPH). They found that healthy young men who were sedentary, ...
Health Feb 04, 2013 | 5 / 5 (2) | 0 |
New research reveals a potential way for how parents' experiences could be passed to their offspring's genes. The research was published today, 25 January, in the journal Science.
Genetics Jan 24, 2013 | 4.5 / 5 (4) | 4 |
(AP)—The case of a Kansas sperm donor being sued by the state for child support underscores the confusing patchwork of laws that govern how assisted reproduction is regulated in the United States.
Other Jan 21, 2013 | not rated yet | 0
The first comparative study on the evolution of sperm quality in young Spanish men over ten years, headed by researchers at the University of Murcia, reveals that spermatozoid concentration in men between ...
Health Jan 18, 2013 | not rated yet | 0
The notion that police can identify a suspect based on the tiniest drop of blood or trace of tissue has long been a staple of TV dramas, but scientists at Harvard have taken the idea a step further. Using ...
Genetics Jan 07, 2013 | 5 / 5 (7) | 0 |
Pioneering research presented at the Fertility 2013 conference today (Thursday 3 January 2013) shows that a large proportion of male cancer patients are missing out on appropriate fertility advice.
Cancer Jan 03, 2013 | not rated yet | 0
Hideaki Kato discovered his true identity by accident. During his medical training a decade ago, the now 39-year-old Japanese doctor was performing blood tests on family members when he learned something ...
Other Jan 01, 2013 | 5 / 5 (1) | 3
For more than 40 years, Bisphenol A, more commonly known as BPA, was used in everything from plastic baby bottles and the lining of metal food containers to dental sealants. When scientists began seeing a connection between ...
Health Dec 07, 2012 | not rated yet | 0 |
The term sperm is derived from the Greek word (σπέρμα) sperma (meaning "seed") and 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. A uniflagellar sperm cell that is motile is referred to as a spermatozoon, whereas a non-motile sperm cell is referred to as a spermatium. Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a totipotent zygote is formed with the potential to develop into a new organism.
The spermatozoa of animals are produced through spermatogenesis inside the male gonads (testicles) via meiotic division. They are carried out of the male body in a fluid known as semen. Mammalian sperm cells can live for up to 3 days inside the female reproductive system.
Sperm cells in algal and many plant gametophytes are produced in male gametangia (antheridia) via mitotic division. In flowering plants, sperm nuclei are produced inside pollen.
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