33 votes

Can bacteria be killed by purely physical trauma?

My (limited) understanding is that it is quite hard to avoid killing some bacteria even with very gentle physical manipulation. On the other hand, it is quite hard to use physical force to achieve ...
Martin Modrák's user avatar
21 votes

Can bacteria be killed by purely physical trauma?

There are plenty of physical or mechanical methods of killing bacteria, but most are used in conjunction with other agents and probably don't qualify as "blunt force trauma". For example, ...
MikeyC's user avatar
  • 4,714
20 votes

Why do hot water baths affect only males' fertility? Why not females'?

Well, the answer by @An J has already explained the prima facie of your question which is: sperms need lower temperature for development. But I will be explaining in my answer: Why do the sperms ...
user 33690's user avatar
  • 1,955
10 votes

What kinds of bacteria live in water bottles?

In addition to the cracks providing a better place for bacteria to grow, all plastic bottles, when reused, are subjected to high levels of bacteria due to contact with hands and mouths. So your water ...
theforestecologist's user avatar
9 votes
Accepted

Is palmitic acid really that dangerous?

Let's first clarify some concepts. Free fatty acids, including palmitic acid, are not present in animal tissues (or in the diet) to any large extent; they are esterified with glycerol to from ...
Roland's user avatar
  • 5,705
8 votes
Accepted

If alcohol is a depressant, why does it makes certain people more hyperactive?

These types of reactions in pharmacology in general are called paradoxical effects. The main effect of alcohol on the CNS is the potentiation of GABA receptors. GABA receptors are (mostly) inhibitory ...
Bryan Krause's user avatar
  • 45.7k
8 votes
Accepted

How do I know if the claims of a scientific paper are generally accepted?

Papers provide evidence for or against various hypotheses, but no one paper is ever a definitive statement on an issue. It is expected that different trials will have different outcomes, both due to ...
Bryan Krause's user avatar
  • 45.7k
7 votes

What kinds of bacteria live in water bottles?

True enough the re-usability of plastic bottles is quite a problem even in the area I live. This is due to multiple factors; one of those factors is the symbiotic microorganisms that could be living ...
Kiny's user avatar
  • 306
7 votes
Accepted

What's the technical difference between fainting (and being unconscious) and falling asleep (and sleeping)?

For this answer I assume that we are talking about sleep in healthy individuals as well as fainting as an isolated event without underlying disease or injury. The most common form of what we call "...
Frieke's user avatar
  • 1,127
7 votes
Accepted

What is this white stuff inside apples?

I am pretty sure that it is a moldy core rot which would be caused by a fungus that infects the apple during the flowering stage. The fungi is also referred to as "apple fuzz". From SF Gate ...
Ebbinghaus's user avatar
  • 2,603
7 votes
Accepted

Why do hot water baths affect only males' fertility? Why not females'?

A mature human sperm has some mitochondria, a nucleus, an acrosome, and a flagellar apparatus. That's it. Because of the lack of other organelles in the sperm, they have to be kept in a kind of 'cold ...
AP2261's user avatar
  • 392
7 votes
Accepted

Wim Hof Method claims Alkaline Blood is Good. Contradictions? Counterproof?

The Wim Hof method unfolds its health effects by hormetic stressors, respiratory alkalosis is one of them (a minor one). The WHM does not follow the pH theory, even though Wim himself gave ambiguous ...
Hannes's user avatar
  • 86
6 votes

Why does fever above 102 herald a cancer patient's death?

I'm not sure I agree with that, but if I had to support that assertion, I would say that while patients with COPD, CHF and neurodegenerative diseases may die of hypoxia (no fever there), patients with ...
anongoodnurse's user avatar
6 votes

Why do obese people heal more slowly?

It's well known that obese patients have slower wound healing, but the specific cause isn't known; most likely there are multiple causes acting together. The correlation between obesity and ...
iayork's user avatar
  • 14.2k
5 votes
Accepted

How do you go from virus infection to disease?

In viral infections, the disease (on the cell/tissue level) is mainly due to immune response that results in inflammation, for example, of the throat mucosal lining, which can trigger symptoms, such ...
Jan's user avatar
  • 8,079
5 votes

Can bacteria be killed by purely physical trauma?

Yes of course. While you can't swing a blunt object comparable in size to humans at something many orders of magnitude smaller to kill it. You can use something like an ultra sonicator, which swings a ...
user40950's user avatar
  • 790
5 votes

Can bacteria be killed by purely physical trauma?

From a biochemical point of view, it is surprisingly difficult to break open a bacterial cell. A molecular biologist, for example, might want to break E.coli cells expressing a protein of interest, in ...
user338907's user avatar
  • 4,723
5 votes

How do I know if the claims of a scientific paper are generally accepted?

@BryanKrause has given a good general answer to this question. One specific approach (which the poster may or may not already have taken) is to look for links on the publisher’s webpage to subsequent ...
David's user avatar
  • 25.7k
4 votes

Why do humans lose subcutaneous fat tissue with age?

Short answer We do not loose fat (cells) as we age; on the contrary - we tend to gain fat by about 1 or 2% per decade. The place where it gets stored does change; instead of going into subcutaneous ...
AliceD's user avatar
  • 52.4k
4 votes
Accepted

Irradiation instead of pasteurization?

Both pasteurisation and irradiation work by killing micro- (and macro-) organisms in food. The two processes are broadly similar and in both cases the objective is to reduce the number of bacteria or ...
arboviral's user avatar
  • 3,344
4 votes

Is it possible to contract the plague by kissing a wild chipmunk?"

The causative agent of the plague, Yersinia pestis, can be indirectly (via a flea vector) or directly (via exposure to infectious fluid or a bite) transmitted by rodents. In the western United States ...
De Novo's user avatar
  • 8,791
4 votes

Can endometriosis be considered a form of cancer?

According to Endometriosis: benign, malignant, or something in between? (PubMed, 2017), endometriosis is not considered cancerous because: Does not appear as an expansille tumor mass Is not ...
Jan's user avatar
  • 8,079
4 votes
Accepted

How can space travel affect women’s fertility?

The most obvious issue is exposure to radiation. Once you're beyond the earth's atmosphere and magnetic field you are exposed to much higher levels of radiation from cosmic rays and solar flares. It's ...
Charles E. Grant's user avatar
4 votes

How do I know if the claims of a scientific paper are generally accepted?

Use google scholar and have a look at the papers that have recently cited it by filtering for the year the citing paper was published. https://scholar.google.com/scholar?cites=17068797659415407733&...
mattmoore_bioinfo's user avatar
3 votes

Will genetically modified food affect our health?

Genetic engineering is a technology not a trait. In general, genetic engineering and genome editing are as safe as conventional breeding and mutagenesis (introducing thousands of random mutations by ...
Frieke's user avatar
  • 1,127
3 votes
Accepted

Any studies on the effects and/or benefits of oil pulling?

This is a classical pseudoscientific claim: It is supposed to help against everything, including AIDS, Diabetes, Bronchitis, Cancer and so on. See for example this table I found online: First, there ...
Chris's user avatar
  • 51.6k
3 votes

What is mold detection threshold in humans?

It depends on the mold. For example, humans can smell octenol in ppb concentrations[1], presumably long before any toxic effects of this or other compounds produced by molds. Octenol is produced by ...
R Stephan's user avatar
  • 3,840
3 votes

Non-Lifestyle related diseases

So the CDC has a list of total leading causes of death https://www.cdc.gov/nchs/fastats/leading-causes-of-death.htm Number of deaths for leading causes of death • Heart disease: 614,348 • ...
Cara Wogsland's user avatar
3 votes

Is it possible for any impurities to get through the apple peel?

The answer I got from Jan Kolář of Charles University: The spores of fungi or bacteria in apples don't just emerge from nothing, they have to get into it from the surroundings. I often see apples, ...
Probably's user avatar
  • 2,438
3 votes

Why do hot water baths affect only males' fertility? Why not females'?

To keep sperm viable in natural body conditions, they are kept at a relative lower temperature than the body temperature, and this can achieved by the scrotum. As sperm is produced in testis, and ...
An J's user avatar
  • 39

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