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Questions tagged [temperature]

Questions dealing with biological processes in relation to temperature, for instance temperature effects on metabolism, enzyme function or development time. Temperature can be measured on many different scales, e.g. in degrees Fahrenheit or Celsius, or Kelvin.

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What is the effect of persistent hypothermia on cardiac performance?

I define persistent hypothermia in this thread about the mechanisms of persistent hypothermia. The Graph of Katzung et al. in Pharmacology about Heart Failure: I am thinking which parts here are ...
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0 answers
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How to pit viper pits maintain high sensitivity across a wide temperature range?

Pit viper infrared vision works nothing like our photochemical rods and cones. It would be blinded by its own thermal noise it if did. Instead, they are sensitive to changes of temperature [of only ...
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How long can a hand be submerged in freezing water?

How long can one's hand be submerged in freezing (0°C) water before cell damage starts to occur? What causes the cell damage? I know exposure to temperatures below freezing can quickly cause frostbite,...
-3 votes
1 answer
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Does thermal shock apply to human bones?

I always knew that a drop of cold water would crack a hot glass. But does this apply for our bones tho? Obviously not instantly, but after repeating it for years? I've always wanted to do cold showers ...
1 vote
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What are common culture temperatures?

In literature, authors sometimes refer to 37°C as a common culturing temperature. As I understand it, those are temperatures that are conventionally used for incubators in laboratories. For mesophilic ...
1 vote
1 answer
155 views

What is the fundamental reason for death from too high or low internal temperature?

I have read something about why we die from too high or too low body temperature but have always found only general reasons. For example, that the liver fails. But why does the liver fail? I would ...
0 votes
1 answer
88 views

[IAL Biology]: Struggling to understand how pH and temperature affect haemoglobins affinity for oxygen

As seen in the graph above, why do we say that increasing pH increases haemoglobins affinity for O2, but decreasing pH reduces its affinity? If the pH increases above or decreases below haemoglobins ...
10 votes
1 answer
11k views

Is human face more resistant to cold than other body parts?

Walking outside tonight in -15˚C I realized an interesting observation: While I felt cold on most part of my body, my face (although the only uncovered part) didn't really feel cold. It registered the ...
3 votes
1 answer
2k views

Why is it cool near the trees?

I can understand that trees produce oxygen in daylight but why is the area with vegetation much cooler than the environment's temperature?
2 votes
1 answer
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What makes humans feel cold?

I have seen various sources talking about the effects of oestrogen on temperature: all of them agree that it makes you cold but they seem to explain the reason differently. One states that oestrogen ...
3 votes
1 answer
312 views

How do small birds survive the winter?

I live in a region with cold winters (ca. -40 C) and many quite small birds (sparrows, crows, ducks) stay for the winter. How can the birds survive this? As I understand it, smaller bodies will be ...
3 votes
1 answer
781 views

Do animals like Seals feel cold on their skin?

Whenever there is a documentary about animals and you get to the colder regions, you will hear about Seals and their layer of blubber keeping them warm. But the skin is on top of the blubber, in ...
24 votes
4 answers
35k views

In Japan, the official average body temperature is 36.0 °C. Why so different from that of Europe?

The Japanese Wikipedia states that the average human body temperature is 36.0 °C (here,"ヒト"). The statement references the data from the Japanese government. Actually all of my Japanese friends think ...
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Does surface to volume ratio matter for cold-blooded species with regards to temperature?

While surface grows quadratically with scale, volume growth is cubic. Temperature exchange (gain and loss) of animals is mostly dependant on surface area (the more area, the faster) whereas heat ...
1 vote
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Why do different animals have different body temperatures?

Why do different animals have different body temperatures. For example, humans have 37°C, while dogs have 39°C. Presumably we have ancestors whose temperature differs from ours. Why would it change ...
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1 answer
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Biology Experiment Algae pH & temperature help?

I am planning a Biology investigation for my IB IA on the impact of temperature and pH on algae growth. Does anyone have tips on how to measure the growth rate of algae? What algae is the most suited ...
3 votes
2 answers
19k views

How much heat can a human sustain?

For how long can a human sustain a temperature of 180 degrees Fahrenheit (82oC) without damage in a confined place? For instance, suppose a person is sitting in a steam-filled room, without external ...
0 votes
0 answers
417 views

At how low a temperature can a snake like a copperhead survive in winter /

Copperheads were very common here, less so now that more people have moved into the subdivision. My yard is sort of an oasis for them . E. TX is expecting record cold in spite of climate change so I ...
1 vote
2 answers
173 views

Are there any benefits/disadvantages/traits from having a permanent lower core temperature?

My body temperature as far as I remember has always been around 35.6 degrees Celsius, that's a degree less than what is the usually quoted as the average temperature for humans. Are there any known ...
1 vote
0 answers
319 views

Lower optimum temperature of plant Catalase

Most resources give an optimum temperature of 35° C for Catalase. after performing the AP Catalase enzyme lab in school, using blended potatoes, our results gave a greater reaction rate at a room ...
0 votes
2 answers
311 views

Why don't cats have to pant?

I understand why dogs pant and humans transpire, namely for temperature homeostasis. So why don't cats need to do either, even after expending a lot of energy on a hot day?
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Taking cold shower / drinking cold water after / during training

(I am a new-comer in biology SE so sorry if violated any rules) Effect of cold showers after intense training I have read the answer to this question, but it seems there are discussions on the ...
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1 answer
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Coronavirus and temperatures

An article on bioRxiv, Evaluation of heating and chemical protocols for inactivating SARS-CoV-2, recommends certain treatments to inactivate SARS-Cov-2 for lab work. The abstract notes: "Although ...
8 votes
1 answer
553 views

Cold water sour taste

Recently I underwent a wisdom tooth extraction, and while there is still numbness I have observed something peculiar. If I drink cold water, it tastes sour, however the same effect is not observed ...
1 vote
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SARS-CoV virus stability at low temperatures [closed]

For SARS-CoV-2 and SARS-CoV1 this study published in NEJM by a NIAID team was done at a temperature of 21-23°C (see the Methods section in their supplemental material). What's known about virus ...
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What is the maximum/minimum temperature humans can survive at for an extended period of time, and what rate does the body temperature change at?

3 questions: At what rate does the body temperature of a human change at? That is, assuming the outside temperature is x, is there some sort of formula that can determine how long it takes for the ...
9 votes
3 answers
3k views

Does body temperature affect human lifespan?

If a human body were somehow to be kept at a cold temperature (say 30C) for the entire life of the given individual. And somehow the brain could be fooled into thinking that this 30C feels nice and ...
3 votes
1 answer
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How long can Legionella survive at 60°C?

I'm coding some stuff for water heaters and one of the functions is anti-Legionella. Anyway, I've read on wikipedia that 90% Legionella dies in first two minutes if the water temperature is 60°C, but ...
1 vote
1 answer
246 views

human body in an environment where temperature is above body temperature

What would happen if humans were to live in an environment where the temperature is above the body temperature? Does the human body have a mechanism to cool the body? When the surrounding ...
4 votes
0 answers
129 views

Are there specific theories as to what causes cold[-water] muscle cramps?

The field of what might cause cramps is quite contested with a lot of controversy around the heat/dehydration cramps, but I find it surprising that no specific theories appear to have been proposed (...
16 votes
4 answers
4k views

Do birds emit infra-red radiation?

I'm an electronics engineering student and I am going to use a sensor that detects infra-red emitted by birds that invade rice paddies. Do birds emit infra-red radiation?
7 votes
1 answer
6k views

How does water buffer a sudden drop in temperature?

A property of water is that it is slow to heat and cool. According to my biology book, some energy from an increase in temperature would spent breaking hydrogen bonds, so that temperature does not ...
1 vote
2 answers
41k views

What happens to our body when we undergo a sudden temperature change from 40℃ to 20℃?

We know that a glass gets cracked when it undergoes sudden change in temperature. But what will happen in the case of a human body if it changes from the maximum(>35℃) to the minimum temperature(<...
2 votes
0 answers
110 views

What's the lowest temperature a tardigrade can remain active at?

There's a lot of information floating around the net about how tough they are & what they can survive, like "We now know that some tardigrades can tolerate being frozen to -272.8 °C". But any ...
1 vote
0 answers
946 views

Why does solute potential go up as temperatures go down?

So the closer a solution's solute potential is to zero, the more water potential said solution would eventually have. The solute potential equation is -iCRT. If the temperature is 0, -iCRT would be ...
2 votes
1 answer
82 views

Psychrotrophic Bacteria

I want to know what gene or protein makes bacteria psychrotrophic, as opposed to regular bacteria that prefers warmer conditions. If you don’t know exactly, and you have suggestions as to where I can ...
2 votes
0 answers
456 views

How does heat stress kill plants?

It is known that many plants typically die when exposed to temperatures of 40 to 50°C (I believe, these figures relate to exposure times of ~1–2 hours). When a plant is heated, what is the mode of ...
1 vote
0 answers
50 views

Does freezer burn affect only the cells on the surface of food?

Suppose i submerge a banana halfway through in a tray with water. Part of the banana is submerged in water, part of it is on the outside. The water and banana in the tray is being put in the freezer ...
4 votes
2 answers
99 views

Breeding mosquitoes at lower temperature

It is well known fact that, to slow down the growth of drosophila, they are grown at 18-19 degree Celsius. It helps in maintaining stocks for longer time without frequent change of food. Is it ...
3 votes
2 answers
1k views

What are the most efficient heat exchange sites on the human body?

Where on the body would be the best place to achieve the greatest cooling effect with a "cooling undergarment"? Concentrated over the kidneys, groin, inside the wrists, back of the neck?
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1 answer
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Where can I find resources of the biological processes occurring after death of a mammal at various temperatures?

Using google I usually end with results in cell death. I found some layman articles, but that does not help. My main interest is the brain part.
0 votes
1 answer
300 views

Does pouring water on your skin affect the evaporation process and heat loss?

Recently I've been playing football in the sun pretty hot temperatures. During the water breaks I tend to pour a lot of water over my head to cool me down, now this has an instant effect on cooling me ...
0 votes
2 answers
80 views

why do we tighten out muscles against cold?

When I'm in shower and I want to open the cold water on myself suddenly I make my muscles so tight before I open the water and that helps so much in being able to handle the shock. Why does tightening ...
0 votes
1 answer
229 views

Dry Bulb Temperature VS Dew Point, which one is most relevant to insects?

I study insects that are leaving freely on my campus. The campus weather station has two different measures of temperature, the Dry Bulb Temperature and the Dew Point Temperature. Which one is the ...
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0 answers
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Can varied temperature while sleeping help quality of sleep?

I read an interesting article which is about relations between body temperature and quality of sleep. I'm interested in the phrase from the article. Other experiments that varied the ambient ...
3 votes
2 answers
338 views

How do non-human apes cool their body temperature in warm climates?

Humans have sweat and we all know how that provides cooling along with the remaining vellus hairs acting as wicks. So how do hominids, our close relatives (some of which are more massive than humans) ...
2 votes
4 answers
242 views

What causes plants in the prunus genus to reach anthesis?

In a related question, I ask how to trick fruit trees into flowering later in the spring by prolonging frozen ground conditions. However, I'm starting to realize that I don't actually understand what ...
5 votes
2 answers
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Trick fruit trees into flowering later in the spring

There is a common problem with fruit trees in temperate climates where the trees flower before the last frost. Generally speaking, if the tree has flowered, and the temperature drops below freezing, ...
5 votes
1 answer
2k views

Why are low temperatures lethal?

Why can't we (human, or even unicellular organisms) withstand low (body) temperatures (5 - 25°C). I have a limited background in chemistry and biology, so this might be obvious, but not to me. I know ...
0 votes
2 answers
740 views

If you are 30 degrees, and touch something that is 50 degrees, do you only feel 20?

First off, I don't know if this is the correct site to post this question as it could possibly fit into others? If so, please flag it to be moved as I would appreciate that very much. Now, if my body ...