Tag Info

New answers tagged

1

Bernoulli's principle can be a little tricky when applied to the cardiovascular system, but it still holds true across the entire system. You mention a good point that the relationship doesn't seem quite right at the aorta or arteries, because of the constant fluctuation of pressure between systolic and diastolic without a significant change in diameter of ...


0

The phenomenon in question is anisochromatopsia, however this term is rarely used. This phenomenon is always present, however it is rarely mentioned subjectively, while objective color testing will reveal it easily. In pathologic state, the term Color Desaturation is being used defining that the previous status of color vision has changed to "abnormal" one. ...


1

I think there are several things that keep Bernoulli's principle from being straightforwardly applied. First, Bernoulli's principle would help us calculate the pressure exerted by the blood on the walls of the vessels, but that's not what blood pressure measures. Blood pressure measures the amount of force that has to be applied to stop the blood from ...


0

It would depend on the stain - and more specifically the material and staining agent. Saliva contains blood clotting agents so I doubt it would help with removing blood stains. The enzymes in saliva are unlikely to help with the stain removal. The water in saliva would be more likely to help, dissolving the stain. So your probably better off with water.


1

We can only observe correlations Let's just talk about statistics. You can see a correlation between two things only if there is variation for these two things. It therefore, make no sense to look at a single trait that has no variance and ask "is it genetically coded?". The only thing that makes sense is to understand what variables explain the observed ...


1

Short answer As far as I am aware, neurotoxic effects of chronic excitatory stimulation are not prevented by receptor trafficking. Background I think the question assumes that 1) neural damage related to continuous activation (excitotoxicity) is preventable by 2) the dynamic regulation of receptor numbers on the neuronal membrane. As far as I can see, ...


5

Babies are bacteria-free at birth. The meconium (the first stool) contains no bacteria if secured early enough. Meconium is a sterile mucilaginous material that accumulates in the fetal intestine and is expelled soon after birth. It contains secretions of intestinal glands, gut constituents (proteins, bile acids, fatty acids, and steroids), and ...


1

In principle, many neurotransmitter receptors work as ion channels and the actual mechanism of signalling involves allowing the influx/efflux of calcium, potassium, magnesium, etc. A good example of this is the acetylcholine receptor. Presumably, if the cell retained the same number of receptors even in the presence of abundant ligands, the cell would flood ...


3

The place where the cord was cut do not stay with us - it falls in a week +- after the birth, while the umbilicus is the only visible natural scar formed by natural processes, not by gynecologists: Multiple sources say the umbilicus has a scar tissue in it. After birth the umbilicus is the only naturally formed visible scar on the body. Br J Plast ...


4

In germ cells telomerase enzyme is active and elongates telomeres, so youngsters are not born older than their parents due to telomeres. Still, they do receive mutations, accumulated by their parents' germ-line cells, i.e. eggs and sperm. Most of the mutations occur upon division of the cell. Egg cells don't undergo many divisions - they are created in the ...


3

Here's a bit of additional information (Although there's an answer from Ilan that satisfied you.) Is it the mould itself that makes us sick or is it something that the mould is releasing? What are the mechanisms that cause us to feel sick after eating mouldy food? The USDA says that there can also be bacteria along with the mould on the ...


0

Urea is the major nitrogenous end product of protein metabolism, and its production reflects both the dietary intake of protein as well as the protein catabolic rate. The magnitude of these processes have a similar influence on urea concentration in the blood stream. Please note, that BUN, aka blood urea nitrogen is a misnomer, here plasma or serum urea ...


-1

People can satisfy their sexual urges on their own (that is, without a sexual partner) through masturbating. They cannot satisfy their hunger on their own (that, without food). I suppose people could eat one food while looking at another kind of food pretending that the food they are eating is the one that they are watching, but where's the fun in that? ...


-1

Mixing of alcohol and energy drinks can be detrimental to ones health as both alcohol and the caffeine in energy drinks are both stimulants which can cause adverse effects on the heart especially if one has a natural sensitivity to caffeine. One also has to be careful as both caffeine and alcohol are diuretics which when combined can cause even greater risk ...


13

One of the most common toxins in mouldy food/bread is aflatoxin. The exposure to high amount of aflatoxin can lead to acute aflatoxicosis with fulminant hepatic failure and even death. While mild exposure to aflatoxin could be asymptomatic, it is better not to take a chance considering possible complications (cit. from the link above): Aflatoxins ...


0

Scratching is getting potentially poisonous or at least irritant substances out and removes lodged insects like ticks. Removing subcutane parasites like scapies mites is not feasible without scratching yourself bloody. I don't see how "scratching them clearly doesn't help us survive". Behaviors and skin reactions evolved way before our modern hygiene and ...


4

It is just a way of highlighting your search term. If you search M00115+C03722, you will see C03722 in red.


1

My understanding is that these statistics show the coverage for each KEGG Module in the particular phylogenetic group. For example, M00001, is found in 275 of the eukaryotic organisms in KEGG (which represents 90.5% of the eukaryotes in KEGG). The same logic applies for other groups. An quick example demonstrating this hypothesis, done with the Protists ...


0

This study in 1984 suggests it's a bad idea and other sites have said eating ants is for weight loss. The abstract says that it goes into detail about the problems associated with eating ants as well as their low nutritional value. So I believe the answer is no. You could not survive long term on a diet of only ants.


1

The quotes in the question provide incomplete information at best. Let's focus on the nitrogen (N) that comes from protein, ignoring for now how metabolism differs among amino acids. We'll assume for simplicity that liver function is OK so that the urea N production rate is a reasonable measure of protein N degradation rate (say in units like moles of N per ...


0

The thing to remember is that no living system is 100% efficient. Firstly lets deal with your statement here: A positive nitrogen balance (where nitrogen balance = N intake − N loss) indicates a greater usage of proteins. Basically means what it says on the tin. If your body is utilising more nitrogen then it is giving out: Positive nitrogen ...


2

Our Unique Microbial Identity (Gilbert 2015) suggests that the gut microbiome is shaped and stablized during infancy and tends to restore equilibrium if it is disturbed later in life. Antibiotics temporarily change the composition of the gut microbiome (by suppressing the growth of certain groups of bacteria more than others), but it tends to drift back to ...


5

What a great question! I'm sorry to add another blow to your theory... but... Even if oxygen depletion would be effective, treating the lungs alone is not good enough. True enough, Mycobacterium tuberculosis bacteria usually attack the lungs, but TB bacteria can also attack other parts of the body such as the kidney, spine, and brain (Fig. 1). If not treated ...


6

The accepted answer is correct but I would like to point out a misunderstanding that has to underly the idea that this would work: In reality lungs aren't a magical one-way gate for the various gases. Lungs do not extract oxygen from the air, they permit oxygen exchange between the air and the blood. Since the air normally has a higher oxygen level than ...


3

The most evident problem I can see for this TB treatment is that mycobacteria can survive without oxygen. Latent TB (a person is infected but doesn't have active TB) is one of the major problem in the treatment of TB and one-third of the world's population has latent TB! (http://www.who.int/mediacentre/factsheets/fs104/en/). A new TB treatment can only be ...


1

The "proper" term to use in a case of growth retardation in children is "failure to thrive", abbreviated as FTT. Celiac disease is one of the most common Organic endogenous (genetically based) FTT syndromes. The main cause of FTT in pediatric celiac patients is malabsorption. In a case of insufficient vitamins and nutrients absorption the child will (have) ...


1

Propofol: a widely used i.v. anesthetic with GABA agonistic properties. It has to be given continuously i.v. When stopped, effects wear off in minutes, and recovery is without serious side effects and little nausea. Induction is quick (minutes or less) since it is administered i.v. Aminophylline (theophylline ethylenediamine), an adenosine receptor ...


2

Xenon. It is like an ideal anaesthetic. See here. Xenon is an interesting anesthetic as it appears to lack negative inotropicy and vasodilatation, giving great advantages to both patients with limited cardiovascular reserve or those who require hemodynamic stability. It has low toxicity and is not teratogenic. Xenon gives rapid induction and ...


22

High oxygen concentration can be deleterious; it can induce oxidative damage. The systemic blood circulation would supply oxygen to the "oxygen-deprived" lung. Moreover, Mycobacteria can survive in anaerobic conditions. And what if both lungs are infected? There are many flaws in the proposed therapy. Adding this point from one of the comments below: ...


1

TL;DR : Food gives the human body much more than simply vitamins & minerals. A healthy diet is essential to overall healthiness, not just this one aspect of it. Micronutrients The component you're asking about - vitamins & minerals - are referred to as "micronutrients", and is only a quarter or so of what the body needs. Micronutrients are the ...


1

This is not a answer but rather a very long comment which obviously would not fit in the 600 characters limit of a comment. Welcome to Biology.SE. How to write a good post I think it is not a good habit to write about personal stories on a science site. It makes your post not very attracting to people who could answer. You should also avoid sentence ...


3

"Unaffected" is impossible. If you meant homeostasis, where fluid ingested = fluid excreted, well that happens all the time, and all "output" is not through urine. Sweat, respiration, fluid in feces, etc. are fluid loss. The body constantly needs water. Fluid regulation is a highly complex system managed by the body through a variety of osmotic gradients in ...


3

There are two things happening: First melanin absorbs the energy from the UV radiation and releases it as infrared energy and thus protects the cells in the skin. This happens in all people, the deeper the skin color is, the better is the protection. What is different between people is the amount of pigment they produce, the number of melanocytes is ...


5

Some additional details on the same lines as Chris' answer: Coelho et al. have studied the short and long term effects of UV on human skin and they report that there are different stages of tanning: Immediate pigment darkening: happens in a few minutes and persists for some hours. It is most probably due to melanosome redistribution and melanin oxidation ...


13

When our skin is exposed to the sun, this can cause some damage in the upper layers of skin. This activates DNA damage repair and also induces signalling towards the melanocytes (which produce the pigment). Signalling means the excretion of signalling molecules (mostly alpha-Melanocyte stimulating hormone, aMSH) which binds to the MC1R receptor (melanocortin ...


5

First, one should mention types of skin: skin type defines how the person will tan - Second, the solar radiation (UV) absorbed by sun defines the amount of melanin produced by melanocytes of the skin to protect the skin = melanogenesis (which in turn depends on skin type). When the solar exposure diminish, the natural repair processes causes ...


1

There are controversial case reports about systemic absorption of paraffin used for constipation. These reports mention systemic effects of paraffin absorption and one of them report liquid paraffin accumulations in abdominal visceral organs. (full text article about paraffin) Liquid paraffin is indigestible and is absorbed only to a limited extent ...



Top 50 recent answers are included