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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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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 ...
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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 (...
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Thermophilic Total plate count with PCA with Triphenyl tetrazoliumchloride as supplement

Hello I'm am a fourth year microbiology analyst and I'm busy with finishing my final internship. During my final internship I have to complete a own assignment. the assignment I got was to find out if ...
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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 ...
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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 ...
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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 ...
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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 ...
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63 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 ...
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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.
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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 ...
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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 ...
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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 ...
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Photosynthesis Experiment - unexpected temperature results

So for Stage 2 Biology we had to do a photosynthesis practical where we manipulate one variable. Summary of prac method: - 50 geranium plant leaf discs were cut using a hole puncher and placed into ...
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2answers
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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) ...
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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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What is the fundamental reason for death from too high or low internal temperature?

I have read something about why we die from over/underheat, but always found too general reasons. Such that the liver fails. But why does the liver fail? I would like to know the most fundamental ...
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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 ...
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4answers
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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 ...
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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 ...
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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, ...
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How does temperature affect sex drive in humans?

I've ran into a science journalism piece which reported on a NBER study fidning that lower human fertility following hot temperatures over 80 degrees Farhenheit. They attributed this effect to ...
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326 views

Why does breathing increase in higher temperatures?

In my experiment, my group increased the temperature of a fish's water. We noticed the fish took more breaths than the prior normal temperature. Is this because the fish is trying to breathe in the ...
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81 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 ...
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How fast can the human body temperature change?

I'm really curious about how fast can a human body temperature change? E.g. how fast can the human body temperature change when the human has fever? I'm not interested in how fast fever changes the ...
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2answers
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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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If you have water on you, does it *actually* cool or down, or do you just *feel* cold?

I'm sure many people have noticed after getting out of a shower or out of a swimming pool that moving air makes them feel colder. It seems like one way to beat the summer heat is with water and also ...
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If people can survive being frozen some, why not indefinitely? [closed]

I've heard of cases and also personally met someone who survived with a full recovery after they were taken to the hospital after being found unconscious in the snow for (presumably) more than 45 ...
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What is operating temperature of the human brain?

I've heard several times that human brain can die in temperatures over 40 °C, or under 10 °C, as an engineer I'm curious. In what temperature region can brain properly work? And just an underlying ...
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Why are the most heat tollerant organisms prokaryotic?

Prokaryotic organisms are able to grow at far higher temperatures than are eukaryotes. Archaea are known to group, among some mesophiles, the most extremophiles organisms (es. Pyrococcus furiosus), ...
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2answers
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What is the benefit of fever during infections?

When people get sick, they often develop a fever. What is the effect of an increased body temperature on viruses and bacteria in the body? Is it beneficial to the infected body? Importantly, often ...
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1answer
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How to convert skin temperature to core temperature?

As opposed to regular invasive thermometers, there are non-invasive IR thermometers to measure the temperature. For example Thermofocus. I read in many sources that these IR thermometers only measure ...
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Development threshold of a blowfly species differ depending on situation?

Within a species, does the lower development temperature threshold remain the same in all situations (also known as the development zero temperature)? For example, would the temperature threshold be ...
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Which organisms require the least fluctuation in ambient temperature?

Note that I am NOT asking "which organism can survive the most extreme temperatures." Many extremophiles like the tardigrade can survives extreme heat, but also extreme cold. Many heat adapted animals ...
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Does drinking water affect oral thermometer accuracy?

According to various sources (including Mayo and Cleveland Clinics), one must wait a certain number of minutes before an accurate oral temperature reading may be taken. However, these two sources (and ...
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Are there organisms which have compartments of different body temperature?

I was wondering if there are organisms which have compartments(inside the body) with different body temperatures. To clarify are there organisms which have tissue/organs which are surrounded by ...
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Why do some people have cold hands and some have warm? [closed]

I've known people who have warm hands even in the most chilling weather and also those having cold hands in a relatively hot climate. Why does this happen?
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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?
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Do action potentials cause the neuron to heat up as well as its environment?

I have read that we might be yawning to cool our brains down, so then a thought occurred to me. If we need to cool down our brain, then our brain but heat up for some reason. The only reason I could ...
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Can photosynthesis take place if the plant is kept in ice cold water or not?

Can photosynthesis take place in a plant even if the plant is kept in ice cold water? I have googled this question, but so far have not found a satisfactory answer.
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1answer
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Why does sunburn cause fever?

Today I found out that sunburns can cause fever. What I don't understand is how/why? In my understanding fever is the side effect of an immune reaction against an intruder, mainly bacteria (though I ...
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Why do crows sit on treetops even when it is cold?

It is cold outside: -1 degrees Celsius, wind 14 km/h and snow from time to time. I was wondering why crows (maybe birds in general in Northern Europe) are calmly sitting in relatively windy places ...
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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 ...
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Why do my muscles move slowly when cold?

When my hands are cold, e.g. outside in the winter with no gloves for a while, their muscles begin to move slowly (assume I'm otherwise comfortably warm, e.g. dressed well but gloveless). I don't ...
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415 views

How does heat generated by metabolism differ compared with heat generated through exercise?

I am from a mathematical background so I don't have much knowledge on biology. I'm building a mathematical model to predict heat generation with parameters of metabolic heat generation and exercise ...
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metabolic heat generation and exercise intensity

Is there a relationship between bio heat equation (found here) and exercise intensity as described here That is I am trying to include the effect from exercises to the tempertaure variation in skin. I ...
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26 views

Good model for comparative genomics in relation to temperature adaptation

Can anyone suggest any highly related bacterial or parasitic species which live at very distinct temperatures, which might be a good model for comparison of genomes in regard to temperature adaptation....
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3answers
202 views

Is there a database providing information about optimum temperature and inactive temperature of enzymes?

I want to know optimum and inactive temperature of some enzyme, but I can't find these information in NCBI, wiki or UniProt. So I want to know if there are some database which provide these ...
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2answers
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Why is warm water comfortable, but warm air uncomfortable?

I friend of mine tried floating, where you lay in a bath kept at body temperature (98.6 degrees F). He said after a while you don't feel the water at all. This made me wonder why being in warm water ...
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Bergmann's rule and Allen's rule: endotherms and ectotherms

Surface area to volume ratio (in terms of heat conservation) is not the only mechanism, but it is still an important mechanism for explaining Bergmann's rule and Allen's rule. Given that, I want to ...
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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?