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What is the probability of conception in situations when sperm isn't directly ejaculated into the woman's vagina, like:The man's or the woman's hands come into contact with sperm, for example when r
While peptide bonds usually adopt the trans conformation, peptide bonds to proline can exist in either cis or trans conformation. The isomerization between cis and trans is slow, and has been shown
I've been reading about Dorsal Raphe Nucleus, a serotonin- rich part of the brain. I noticed mentioning of "tonic activity" - regular pulsing that releases neurotransmitters. On top of this "tone" t
Consider that an organism has two homologous chromosomes Ap, Am, Bp and Bm (p = paternal and m =maternal) and also has a chromosome Z without a homolog.
I've heard that the brain consumes quite a lot of oxygen and energy, compared to the rest of the body.
I was watching a talk by Michio Kaku and he mentioned that crocodiles (or possibly alligators, I forget offhand) don't actually age -- they can die, but they essentially go through no aging process
Using the Ames test, we add a mutagen to auxotrophic salmonella with mutations in the histidine pathway and rat liver extract to simulate metabolism.
Why do we think chronic inflammation can cause cancer? What makes scientists believe that inflammation causes cancer?
I have just an intuition that the carbohydrate part of glycoproteins help them to fulfil those tasks like in plasma membranes. You can also get many more receptors if you can use carbohydrates too.
From what I read on the NatGeo app, it stated that the speed of the electrical impulses that are sent by a neurone will be approximately 332 kilometers per hour.
I have just taken some images with my light microscope at 400x of (what I think is) some form of filamentous algae from a local pond.Now, I think I am looking at a single cell (centre) with some sort
I would like to know if evolution is continuing to happen in modern humans, assuming things like existence of the nuclear family structure, fidelity to one partner, etc. It seems to me the answer wo
The first book he mentions in the bibliography is Alberts' "Molecular Biology of the Cell". Looking at the description and the reviews it seems that this is a pretty advanced bio-sciences graduate l
Can someone explain in layman's terms how taking longer (especially spending years as a small tortoise) to reproduce was a winning trait, and how their biology delays the processes of senescence to
Our waterways and oceans are showing increased levels of plastic contamination. These plastics are breaking down into smaller pieces. When one goes to the beach and plays in the surf they often swal
Well, most of us have experienced the wonderful feeling of the dreaded hangover. How does it work exactly? I imagine it has something to do with dehydration but what are the underlying mechanisms?
Due to high blood pressure, my doctor has recommended I go on a low-sodium diet. So, that got me wondering what it is about sodium that drives this recommendation.
If somehow a human could give a tumor unlimited resources, would the cancer grow forever? It seems like it would until it gets so large that it physically affects vital organs.
The major output from the digester is methane - with a significant component of carbon dioxide. To scrub/reduce the CO2 I was thinking of passing the methane through a freshwater container charged w
The theory of natural selection has it that individuals with better genes tend to survive and reproduce, passing their genes to their offspring. This gradual process results in a population more ada
In protocols for minimal media for growing bacteria I often see that a vitamin mix or a mix of various trace metals is added. But at least for E. coli I know that those are not strictly necessary, t
I was just reading Evolution of lactose tolerance, and in it one line says "But there was a time in human history when our diet and environment conspired to create conditions that mimicked those of
I'm wondering what produces the feeling of hunger in humans. Checking Wikipedia revealed that leptin and ghrelin are two hormones involved. I've also read that the digestive system produces its own
It is impossible to breed a blue rose or a cat with a bulldog shape. This is because breeding is limited by gene variations in the population.
I've been reading that over the course of the day, human body temperature follows diurnal rhythm with the lowest body temperature observed some time close to the middle of the sleep episode, while t