Toxic chemicals in UK whales and dolphins are exceeding safe limits
Almost half of marine mammals around the UK are being poisoned by banned chemicals.
Environment
Dec 2, 2023
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News tagged with sperm
Tiny worms are helping scientists better understand fertility
Studying sex from just the male perspective misses half the experience. But much of what we know about the origins of reproductive cells comes from looking at sperm and egg formation separately—or only focusing on sperm.
Cell & Microbiology
Nov 30, 2023
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1
Malfunction in spermatogenesis: Researchers uncover contribution of cylicin proteins to male fertility
For successful fertilization, sperm should move forward rapidly and be shaped correctly. The unique structure of the sperm cells forms during spermiogenesis. Now, researchers from the University Hospital Bonn (UKB) and the ...
Cell & Microbiology
Nov 28, 2023
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The way a sperm tail moves can be explained by mathematics worked out by Alan Turing
Alan Turing might be best know for his work helping to crack Germany's "Enigma" communications code during the second world war. But he also came up with a theory where patterns can form just through chemical compounds spreading ...
Molecular & Computational biology
Nov 26, 2023
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678
Caribbean island of Dominica creates world's first marine protected area for endangered sperm whale
The tiny Caribbean island of Dominica is creating the world's first marine protected area for one of earth's largest animals: the endangered sperm whale.
Ecology
Nov 13, 2023
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190
Study elucidates poorly understood sperm structure, providing insight on infertility
Michigan State University researchers have solved the mystery of a poorly understood sperm structure called the cytoplasmic droplet, or CD. The CD is an expanded cytoplasm—watery, gel-like cell contents enclosed by cell ...
Cell & Microbiology
Nov 9, 2023
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25
Model suggests that mammalian sperm cells have two modes of swimming
A new mathematical model predicts that mammalian sperm cells have two distinct swimming modes. This prediction opens new questions about potential connections between sperm cells' motor activity and their transitions to hyperactivation ...
General Physics
Nov 6, 2023
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249
Scientists reveal new mechanism for dynamic regulation of manchette microtubules during sperm development
Researchers led by Meng Wenxiang from the Institute of Genetics and Developmental Biology of the Chinese Academy of Sciences have shown that knocking out of the calmodulin-regulated spectrin-associated protein 1 (CAMSAP 1) ...
Cell & Microbiology
Nov 6, 2023
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29
Sperm can adjust their swimming style to adapt to fluctuating fluid conditions
Sperm can modulate their energetics by regulating their flagellar waveform—how the sperm oscillate their tails—in order to adapt to varying fluid environments, potentially optimizing their motility and navigation within ...
Cell & Microbiology
Nov 1, 2023
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61
Greenpeace urges Greece to scrap offshore gas drilling project because of impact on whales, dolphins
Greenpeace on Thursday urged Greece to abandon a deep-sea gas exploration project in the Mediterranean, citing newly published research to argue that its impact on endangered whales and dolphins would be greater than previously ...
Ecology
Oct 27, 2023
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5
Sperm
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.[citation needed]
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.
This text uses material from Wikipedia, licensed under CC BY-SA
