Sentences with phrase «of swimming sperm»
Aatishb: Yes, I have a piece included, on the physics / biology of swimming sperm:) http://www.empiricalzeal.com/2011/07/14/what-it-feels-like-for-a-sperm/.
https://www.scientificamerican.com/ Not exact matches
Rather, the pills delay ovulation, the release of eggs from ovaries that occurs before eggs are fertilized, and some pills also thicken cervical mucus so sperm have trouble swimming.
And after an hour, only about 2,000 of the sperm make it through the uterus to the second round: the swim up the fallopian tubes.
Instead, you can explain that the father's sperm swim out of his body and into the mother's womb.
A draw back of some fertility drugs is they make your cervical mucous incompatible with sperm, which does not allow the sperm to swim up into the uterus.
You will see a pictorial expression of fertilization processes; how the sperm cell swims to an ovary and clings to it, then within some weeks a fetus looking like a tadpole is formed.
«Simply put, the compound turns - off the sperm's ability to swim, significantly limiting fertilization capabilities,» said lead investigator Michael O'Rand, PhD, retired professor of cell biology and physiology in the University of North Carolina at Chapel Hill School of Medicine, and president / CEO of Eppin Pharma, Inc. «This makes EP055 an ideal candidate for non-hormonal male contraception.»
Dr Clair Bennison from the University's Department of Animal and Plant Sciences, said: «We know that in the zebra finch, long sperm swim faster than short sperm, so we might expect longer, faster swimming sperm to simply reach the egg first.
Using this biologically accurate model of how dynein moves the microtubules within the axoneme, Ingber and Reilly created a short film called «The Beginning,» which draws parallels between sperm swimming toward an egg and spaceships flying toward a planet in space, giving an artistic bent to a scientific topic.
Protons rush out of sperm cells, their pH rises and sperm start to swim (Cell, DOI: 10.1016 / j.cell.2009.12.053).
Hormonal IUDs thin the lining of the uterus and thicken the mucus on the cervix, preventing sperm from swimming.
For example, according to the Shettles method, having sex as close to the moment of ovulation as possible is supposed to skew the ratio towards boys: the Y chromosome is smaller, so the reasoning is that Y - carrying sperm swim faster and are first to reach the egg.
Tiny sperm need plenty of energy to swim their way to their target.
In fact, scientists have been working to update lab tests to look beyond sperm count, swimming ability and shape (also known as morphology, a subjective measure that is tough to replicate with an algorithm) to explore other possible causes of male infertility.
The study, which is published today (Thursday) in Human Reproduction, has found that these men, who were aged between 18 to 22, had almost half the sperm concentration and a two-fold lower total sperm count [1] and total count of motile sperm (sperm that could swim well) than did naturally conceived men of a similar age.
Other nonhormonal approaches to male contraception target different aspects of the sperm's life cycle, such as by nullifying their ability to swim or attach to eggs, or by using a small plug to physically block their ejaculation.
Because one end of each tube was slightly narrower than the other, sperm that swam into the wider end become trapped, headfirst, with their flagella still free.
He placed male and female mosses of the species Bryum argenteum in vials lined at the base with plaster of paris, which prevented the sperm from swimming.
Previously, fertilization of mosses was thought to depend on the capacity of individual sperm to swim through a continuous water layer.
It uses a field of three - dimensional posts that create an obstacle course for the swimming sperm cells.
The device uses a field of three - dimensional posts that create an obstacle course for swimming sperm cells.
Nearly half of the samples contained cells with flagella, tail - like projections that sperm use to swim.
When gametes are expelled, sperm are attracted by a chemical cue and swim rapidly to one pole of the egg (bottom left) in order to fertilize it.
Yet these sperm can only swim a couple of centimeters before tuckering out, and botanists have long wondered how female plants can produce their version of seeds — sporophytes — with the closest guy 10 to 20 centimeters away.
The results, published January 27 in the Proceedings of the National Academy of Sciences, suggest that the male contribution to conception and development is far more than a few swimming sperm.
When they loaded sperm cells with doxorubicin, a common chemo agent, and released them in a dish containing mini cervical cancer tumours, the sperm swam towards the tumours, killing 87 per cent of their cells within three days.
The finding that changes in sperm motility, swimming speed and linearity are less pronounced in the presence of own seminal fluid also suggests that enhanced mobility is costly to ant males, for example because it may place sperm under oxidative stress, according to the authors.
The proportion of mobile sperm, their swimming speed and linearity were 40 %, 15 % and 8 % higher when exposed to rival seminal fluid or queen secretions than when exposed to own seminal fluid.
They showed that endocrine disruptors — applied at concentrations measured in body fluids — directly open CatSper and, thereby, increase calcium levels in sperm, change their swimming behavior, and trigger the release of digestive enzymes that help sperm to break through the egg coat.
Altogether, the study indicates that endocrine disruptors might disturb the precisely coordinated sequence of events underlying fertilization in several ways: the chemicals might evoke changes in swimming behaviour at the wrong time and wrong place, hinder navigation of sperm towards the egg, and hamper penetration into the protective egg coat.
In other animals, such as bats, sperm can remain viable for several months, swimming in place along the walls of the female's uterus.
SPERM RACE: Fluorescently tagged sperm swimming inside the lower reproductive tract of a Drosophila simulans female, who mated first with a D. mauritiana male (orange sperm heads), followed by a D. simulans male (blue - green sperm heSPERM RACE: Fluorescently tagged sperm swimming inside the lower reproductive tract of a Drosophila simulans female, who mated first with a D. mauritiana male (orange sperm heads), followed by a D. simulans male (blue - green sperm hesperm swimming inside the lower reproductive tract of a Drosophila simulans female, who mated first with a D. mauritiana male (orange sperm heads), followed by a D. simulans male (blue - green sperm hesperm heads), followed by a D. simulans male (blue - green sperm hesperm heads).
«Our compound stops sperm from swimming,» Michael O'Rand, a retired professor of cell biology and physiology at the UNC School of Medicine and lead author of the study, told Newsweek.
A sample of 25 μl from the surface of the drop (swim - up) was placed on a microscope slide to obtain quantitative parameters of sperm motility.
Specifically, we found non-linear selection against divergent combinations of sperm length, velocity and swimming path linearity.
By measuring multiple ejaculate traits of each male, the study characterized complex patterns of multivariate selection on combinations of sperm size, speed, and swimming path straightness.
Well, «they» may think they can make my sperm swim to the left, but little do they know that I have found the answer to making all of the world's citizens completely immune to toxins by virtue of the ultimate way to purge your cells and tissues of contaminated debris.
The percentage of sperm swimming rapidly forward should be estimated from at least four different places on the slide, and the presence of sperm agglutination — which is associated with such causes of infertility as Brucella and anti-sperm antibody — noted.
Behind the ambiguous female is a possible allusion to Munch's Madonna: a pattern of light - green sperm swimming against a darker green ground.
«Scientists knew that ocean acidification was eating away at the shells of marine animals, but the new study has found that rising acidity hindered marine sperm from swimming to and fertilising eggs in the ocean.»
On the second day, numbers of right whales were seen, who, secure from the attack of a sperm whaler like the Pequod, with open jaws sluggishly swam through the brit, which, adhering to the fringing fibres of that wondrous Venetian blind in their mouths, was in that manner separated from the water that escaped at the lip.
According to the caption, the sperm is a victim of an endocrine - disrupting chemical in sunscreen that has damaged its swimming ability.
Scientists say that sperm counts have plummeted in the past 75 years and that 90 percent of a typical young man's sperm nowadays is misshapen and unable to swim properly.
Sperm whales have been observed sleeping in a vertical position near the surface of the water where they cycle through a slow drifting dive, sinking down into the water and then, in their sleep, swimming back up to the surface again.
Thicker cervical mucus makes it hard for sperm to swim to an egg — kind of like a sticky security guard.
Thicker cervical mucus makes it hard for the sperm to swim to an egg — kind of like a sticky security guard.