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image: Coral Sperm Banker

Coral Sperm Banker

By The Scientist Staff | February 1, 2018

Mary Hagedorn is racing to save Earth’s coral reefs by developing techniques for freezing the colonial animals’ gametes.

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image: Researchers Cryopreserve Coral Sperm

Researchers Cryopreserve Coral Sperm

By Catherine Offord | February 1, 2018

A project aims to preserve samples of the climate change–vulnerable animals for future restoration.

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The switch from maternal factors involves dynamic reprogramming of the zygotic genome.

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New technologies reveal the dynamic changes in mouse and human embryos during the first week after fertilization.

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image: Image of the Day: Sperm Protectors

Image of the Day: Sperm Protectors

By The Scientist Staff | August 18, 2017

Among their many functions, macrophages in mouse testes guard sperm against attacks by other immune cells. 

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image: Smartphone Semen Assay

Smartphone Semen Assay

By Kerry Grens | March 23, 2017

An app-based sperm analyzer screens for signs of male infertility.

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image: Promiscuous Mice Have Extra-Fast Sperm

Promiscuous Mice Have Extra-Fast Sperm

By Jef Akst | October 19, 2016

The tails of polygamous deer mice sperm have longer midsections than the sperm tails of monogamous individuals of a similar species, and this correlates with improved swimming and competitive ability.

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image: Study: Mitotic Cells Can Reprogram Mouse Sperm

Study: Mitotic Cells Can Reprogram Mouse Sperm

By Ashley P. Taylor | September 13, 2016

Murine embryos undergoing first cell division can reprogram injected sperm and develop normally. 

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image: Scientists Solve Giant Sperm Paradox

Scientists Solve Giant Sperm Paradox

By Tanya Lewis | May 26, 2016

A study reveals why some male fruit flies produce sex cells that are 20 times the length of their bodies.

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image: Skin Cells Turned Into Immature Sperm

Skin Cells Turned Into Immature Sperm

By Tanya Lewis | April 29, 2016

The reprogrammed germ-like cells were unable to fertilize eggs, however. 

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