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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.

IVF using frozen embryos may be linked with higher risk of hypertensive disorders in pregnancy

In vitro fertilization (IVF) using frozen embryos may be associated with a 74% higher risk of hypertensive disorders in pregnancy, according to new research published today in Hypertension, an American Heart Association journal.

26 Sep 2022

No adverse affect on sperm quality 6 to 14 months post BNT162b2 COVID vaccine

A study published in the journal Gamete Biology demonstrates that the mRNA-based coronavirus disease 2019 (COVID-19) vaccine developed by Pfizer/BioNTech is not detrimental to sperm health over a long period post-vaccination.

20 Sep 2022

Is there any impact of COVID-19 vaccines on the fertility of men and women of reproductive age?

Researchers assessed the impact of SARS-CoV-2 vaccines on human fertility.

19 Sep 2022

New mechanism may prevent the natural aging of immune cells

A new mechanism that slows down and may even prevent the natural aging of immune cells – one of the nine 'hallmarks of aging' – has been identified by an international team led by UCL scientists.

15 Sep 2022

Study reveals pan-antiviral properties of PDC-109 bovine seminal plasma protein

In a new study, researchers explored the antiviral activity of the bovine seminal plasma protein PDC-109 against various mammalian viruses, including severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).

15 Sep 2022

Children more likely to develop asthma if their father was exposed to second-hand smoke in childhood

Children are more likely to develop asthma if their father was exposed to second-hand smoke when he was a child, according to a study published today (Thursday) in the European Respiratory Journal. The study also shows that children's risk of asthma is even higher if their father was exposed to second-hand smoke and went on to become a smoker.

14 Sep 2022

The effect of cannabis exposure on the entire sperm DNA methylome in rats

A new study examines how cannabis use among men could cause heritable effects on male fertility.

14 Sep 2022

Newly discovered protein could help to improve fertility treatments

Scientists have discovered a new protein which helps sperm fuse to an egg and is fundamental for human fertilization.

8 Sep 2022

How does SARS-CoV-2 affect the male genitourinary system?

In a recent paper published in the American Journal of Clinical and Experimental Urology, researchers reviewed existing data on the effects of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections on the male genitourinary (GU) tract.

7 Sep 2022

How does SARS-CoV-2 infection impact fertility in men?

In a recent review published in the journal Endocrines, researchers summarized existing literature findings on the impact of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections on the male reproductive system and fertility.

7 Sep 2022

In the rush to curtail abortion, states adopt a jumbled stew of definitions for human life

As life-preserving medical technology advanced in the second half of the 20th century, doctors and families were faced with a thorny decision, one with weighty legal and moral implications: How should we define when life ends? Cardiopulmonary bypass machines could keep the blood pumping and ventilators could maintain breathing long after a patient's natural ability to perform those vital functions had ceased.

6 Sep 2022

New kind of synapse discovered in neurons’ tiny hairs

Scientists at HHMI's Janelia Research Campus have discovered a new kind of synapse in the tiny hairs on the surface of neurons.

1 Sep 2022

Study finds strong evidence for the ability of SARS-CoV-2 to infect human sperm in vitro

Researchers explored the molecular and cellular mechanisms of SARS-CoV-2 infection.

30 Aug 2022

Mouse embryoids offer a promising model system to spur research into embryonic development and disease

Scientists funded in part by the National Institutes of Health have generated a mouse embryo model, or embryoid, that develops beyond neurulation—formation of the neural tube, which gives rise to the central nervous system—and closely mirrors natural mouse embryos 8.5 days after fertilization.

25 Aug 2022

Men exposed to industrial air pollution exhibit sperm mitochondrial DNA deletions

Researchers compare the length spectra of sperm mitochondrial DNA deletions in two seasons with varied air pollution levels.

14 Aug 2022

What is the impact of COVID-19 on male reproductive health?

In a recent study, researchers assessed male reproductive health three months after COVID-19 infection.

12 Aug 2022

Sperm not affected nine months after COVID-19 mRNA vaccination

A recent study compared the effects of COVID-19 vaccines on male fertility at a median of nine months after receipt of two mRNA vaccine doses.

8 Aug 2022

Asexual reproduction results in more harmful genetic mutations than sexual reproduction

A team led by biologists at The University of Texas at Arlington has published a study supporting the theory that species that reproduce asexually have more harmful genetic mutations than those utilizing sexual reproduction.

1 Aug 2022

How does COVID-19 affect sexual and bladder functions in men?

Researchers discuss the impact of COVID-19 on the urogenital health of males.