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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.

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.

1 Aug 2022

Study uncovers the crucial roles of kinesins during the malaria parasite life cycle

Scientists at the University of Nottingham have made a major breakthrough in understanding how malaria parasites divide and transmit the disease, which could be a major step forwards in helping to prevent one of the biggest killer infections in the world.

29 Jul 2022

FUJIFILM Irvine Scientific Launches Heavy Oil for Embryo Culture: Optimized Protection for the IVF Laboratory

FUJIFILM Irvine Scientific, Inc., a world leader in the innovation, development, and manufacture of cell culture media and assisted reproductive technologies (ART), today announced the launch of its Heavy Oil for Embryo Culture, a sterile mineral oil with an optimal weight viscosity that provides the ideal balance between ease of use and protection.

From FUJIFILM Irvine Scientific 27 Jul 2022

Researchers develop new SERS method for active capture of target molecules

Recently, a team led by Prof. Yang Liangbao from Hefei Institutes of Physical Science, Chinese Academy of Sciences used the nano-capillary pumping action to automatically capture the target molecules into a smaller gap and achieve highly sensitive Surface-Enhanced Raman Spectroscopy (SERS) detection by constructing a multilayer nanoparticle film to form a natural gap of less than 3 nm between the layers.

19 Jul 2022

DNA may act as nutritional source for E. coli

Findings of a new experiment could be helpful in understanding how DNA acts as a nutrient for gut bacteria, and its impact on the health of the host.

18 Jul 2022

Newly characterized stem cell self-renewal factor enables continuous sperm production

Unlike women, who are born with all the eggs they'll ever have, men can continue to produce sperm throughout their adult lives. To do so, they require a constant renewal of spermatogonial stem cells, which give rise to sperm.

15 Jul 2022

Bacterial infections cause sperm dysfunction via their outer membrane vesicles

A new study discusses the impact of Escherichia coli (E. coli) infection on sperm parameters.

13 Jul 2022

Ancestral molecule from bacteria-like cells may offer evolutionary insight on sexual reproduction

A study from Karolinska Institutet in Sweden, among others, presents the theory that egg-sperm fusion, a crucial feature of sexual reproduction in plants and animals, may have originated from an ancient form of genetic exchange that involved the fusion of bacteria-like microorganisms called archaea.

12 Jul 2022

DNA must be enormously compressed in sperm cells, study says

If you are moaning once again about your suitcase being far too small as your vacation approaches, you should take human sperm cells as an inspiration.

11 Jul 2022

Commercial DNA databanks transform how people involved in donor conception seek information

People conceived by sperm and egg donation, as well as their parents and donors, are making use of commercial genetic DNA testing in a variety of ways little considered in earlier reports, according to the interim results of a qualitative study presented here at ESHRE's 38th annual meeting in Milan.

7 Jul 2022