Life existed without human beings for more than 99.9% of Earth's history. Yet we often ignore the achievements of species that preceded us by billions of years.
Plants & Animals
Apr 19, 2023
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14
Sperm must swim swiftly to an egg in order to fertilize it, and so they have evolved hydrodynamic shapes. Most of the space in the head of sperm cells is taken up by the DNA they carry, so the cells coil up their DNA super ...
Cell & Microbiology
Apr 11, 2023
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8
Researchers at Tel Aviv University have developed a hybrid micro-robot, the size of a single biological cell (about 10 microns across), that can be controlled and navigated using two different mechanisms—electric and magnetic. ...
Bio & Medicine
Mar 27, 2023
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408
Developing approaches to protect human well-being in a changing climate will depend on a deeper understanding of how mammalian cells and organisms adapt to dramatic shifts in temperature and in the availability of food and ...
Evolution
Mar 3, 2023
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3
Scientists from Denmark and China have estimated germline mutation rates across vertebrates by sequencing and comparing genetic samples from 151 mother, father, and offspring trios from 68 species of mammals, fishes, birds ...
Different cell types—say, heart, liver, blood, and sperm cells—possess characteristics that help them carry out their unique jobs in the body. In general, those characteristics are hard-wired. Without intervention, a ...
Cell & Microbiology
Feb 21, 2023
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66
During embryonic development, two different cascades of genetic signals determine whether the embryo's primordial gonad will become testes or ovaries, and thus whether the embryo will develop into a male or a female. Disruptions ...
Molecular & Computational biology
Jan 4, 2023
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64
Sexual reproduction of plants requires pollen to land on the stigma, which then germinates and grows pollen tubes through the style to deliver sperm cells to the ovule. Pollen tubes are the fastest-growing plant cells known. ...
Plants & Animals
Jan 4, 2023
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23
The cockroach, reviled around the world for its sickness-causing potential and general creepiness, now occupies an important position in the study of amber fossils thanks to research by an Oregon State University scientist.
Paleontology & Fossils
Dec 12, 2022
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145
A team of researchers at the University of California, San Diego, has developed a green algae capsule for delivering chemotherapy drugs to the gastrointestinal (GI) tract. In their study, published in the journal Science ...
