The effect of temperature on the growth and survival of bacteria?
409748
Too cold they do not grow and might die depending on what type. Start increasing temp. and growth speed will increase also up to an optimum growth temp. then start decreasing again and at a certain temp. will start dying again (depending bacteria kind). The optimum grow temp. also varies between 20 and 90 deg. cent.
883446
Hi, it depends on particular organisms. Check the link below for basic mathematical formulas you may be able to use.\n\nA study is done in which the number of bacteria in a liquid culture is monitored over a period of several hours. Ten observations were made:\n\n\nTwo questions need to be answered:\n\nIs this data consistent with an exponential growth model: N = N0ekt, where \nN0 = the number of bacteria present initially (at t = 0)\nk = a growth rate constant\nN = the number of bacteria present at a given time t,\nand e is the fundamental mathematical constant forming the base for natural logarithms. \nIf the answer to the first question is "yes", then what are the values of N0, k, and t2 (the so-called doubling time) for this bacterial system?\nThe experimental measurements listed above indicate the number of bacteria are growing with time. If we plot the observed values of N (vertically) against the elapsed time, t, in hours, we get a graph (available on web page below).\n\nYou can draw a smooth curve through the experimental points as shown in this figure, and the points all seem to lie relatively close to this curve. Further, this curve looks quite a bit like the graph of an exponential function, but from what we see, it might just as well be part of a parabola or of one of a number of other curves that result when various algebraic forms are graphed. This graph suggests that the answer to the first question may be "yes", but we would usually want stronger evidence than this to draw a definite conclusion. The trouble here is that it is difficult to distinguish precisely and reliably between the curves are the graphs of quite different mathematical functions.\n\nThere is, of course, one curve that is easily recognized by everyone - the straight line! In this situation, the logarithmic function can be used to rewrite the exponential growth formula into a form that will allow us to create a plot that does give a straight line when data is the result of an exponential growth (or decay) process. Start with the exponential growth formula:\n\nN = N0 ekt\n\nSince this involves an exponential with base e, it is "natural" to use natural logarithms - those based on the number e. Using the more common notation ‘ln’ for ‘loge’, we simply take the logarithm of both sides of the previous equation:\n\nln N = ln(N0 ekt)\n\n= ln N0 + ln(ekt)\n\n= ln N0 + kt ln e\n\n= ln N0 + kt\n\nHere, we have used two of the three basic properties of logarithms to manipulate the right-hand side, namely that\n\nlog (AB) = log A + log B \n\nlog (Am) = m log A \n\nFurther, in the last step we took advantage of the fact that by choosing to work with natural logarithms, ln e = logee = 1. Thus, the exponential growth formula can be written in the logarithmic form\n\nln N = kt + ln N0\n\nIf the exponential growth formula is correct and we were to plot ln N along the vertical axis of our graph (rather than N itself), and t along the horizontal axis, then the equation of the plot we are preparing will have the generic form\n\nvertical quantity = constant x horizontal quantity + another constant \n\nBut this is just the equation of a straight line. The plot that results using the data given above is available on web site below.\n\nAlthough the values written on the vertical axis are values of N, this graph is ruled vertically so that the vertical distances are actually proportional to ln N. Since one scale is logarithmic (the vertical one) whereas the other graph scale, the horizontal one, is the ordinary uniform spacing type, this is called a ‘semilogarithmic plot’.\n\nAt any rate, the figure indicates that the points are scattered about a straight line, the scatter due to small random errors in measurement. Since the plot of ln N vs t gives a straight line, we have confirmed that\n\nln N = kt + ln N0 (equation *) \n\nis a valid formula for this data, and therefore, so is its equivalent, N = N0 ekt, valid for this data.
50014
Some bacteria cells are naturally more or less resistant to bacteria - it's genetic variation just like some people are more resistant to the effects of alcohol.  When a population of bacteria is exposed to an antibiotic, some will die right away, while more naturally resistant bacteria will stay alive.  If there is not enough antibiotic to kill all the bacteria (like if someone doesn't take all the antibiotics prescribed to them), only the bacteria that were naturally more resistant will be left.  With little competition to keep them from replicating (because all those less resistant bacteria died), the remaining cells will reproduce to form an entire population of resistant bacteria.
1138549
you need to try a science website , i know the temp has to be very high. just put your question into a web search.
600976
FDA recommends a critical\nlimit of 40 ‘F or less. Histamine and/or toxin formation (produced.by\nmicrobial growth) are hazards that can result from exposure to temperatures\nabove 40 ‘F for extended periods of time.
270533
Our body can't take much of anything. Too much of anything spells disaster. Same applies for the surroundings we live in. Not just the temperature but also the bacterias in our workplace or home have an effect on our health. Surveys tell that children who live in farms or away from city pollution are healthy not because their living place is pollution free but because they are open to all kind of germs which makes their body more immune to germs. Same way if you get used to a constant temperature its bad effects will be seen when you are in a situation where the temperature cannot be maintained. So Constant changes in room temperature should not be too bad... but see that its not on extremes. Keep it warm or cool if you can control it.
231570
Let us not forget irradiation. exposure to cesium kills all microbes in the food after it is hermetically sealed it will last indefinately at room temperature. I am not pro or con on this, just thought I would mention it.
928344
Tap water contains inpurities, so it will impact both of the temperatures... but since it is MOSTLY pure, meaning the amount of inpurities are very small, it is almost negligible.  I just mention this as you said "EXACTLY"...\n\nKeep in mind though, 0C and 100C assumes EXACTLY 1 atmosphere of air pressure, which we never have....
466609
well, there are many factors that led to the growth of bacteria..first, the temperature. Temperature affects the growth of bacteria. Like for instance, there are several bacteria that thrive in room temperature, and there are those that thrive in very cold or very hot temperatures. Second, the pH affects the growth of bacteria also. For example, there are micro organisms that thrive in very acidic env't (ex. Candida albicans which causes Candidiasis), also there are those that thrive in alkaline env't.Third, there are special micro organisms that thrive in extreme environment. For instance, there are those that thrive in very saline env't, called extreme halophiles. There are also that thrive in methane- rich env't.\nThere are other factors that lead to the growth of micro organisms but one thing is for sure...micro organisms are everywhere even in the place where no other living things can thrive...
105832
theres pretty much bacteria in anything, but the question is if there's any harmful bacteria. if you cook everything to a safe temperature you should be able to kill most harmful bacteria in what you consume. if there is any bacteria that would be harmful in larger amounts, your body and immune system, the amazing thing they are, can attack these bacteria and render them useless.
247215
it mostly depends on the vitamin. some vitamins help certain bacteria to grow and some make them die. it all has to do with the vitamin
1031172
The effects of temperature may be explained on the basis of kinetic theory - increased temperature increases the speed of molecular movement and thus the chances of molecular collisions, so within a narrow range (often 0-45 °C), the rate of reaction is proportional to the temperature. It is often said that an enzyme's rate of reaction doubles for every10° C rise in temperature. In this respect, the biochemistry of enzymes is similar to chemistry as studied elsewhere, However, the interaction between this positive effect of increased temperature and the negative effect described below results in a different situation, so that enzymes may be said to have an optimum temperature for their action. \n 4 Above normal temperatures (say 60 °C), heat alters irreversibly the enzyme molecule. This denaturation is due to molecular vibrations (caused by heat) which change the shape of the protein, altering the folding and internal cross-linkages in its polypeptide chains. These changes - especially in the region of the active site - mean that the enzyme is inactivated, even when returned to normal temperature. \nIt would be wrong to say that an enzyme is KILLED by heat, since it is only a molecule, not an organism. \nHowever, misconceptions of this sort are easily spread (see the BASC enzymes booklet!) \n\n\n\nThe higher the temperature to which the enzyme is subjected and the longer the heating is continued, the greater the proportion of damaged enzyme molecules and the result is that the conversion process becomes less and less efficient.\n\n\n\n\n\nBelow normal temperatures, enzymes become less and less active, due to reductions in speed of molecular movement, but this is reversible, so enzymes work effectively when returned to normal temperature.
412899
i done MSc immunology and the answer to this question was not clear. few theories for u to look at. 1. bacteria enjoy a specific temperature usually 37C. maybe they wont thrive in high temperatures? not a lot to support this theory. we know bacteria do very well in hot bodies! 2.its a physiological response to antibody production. the hypothalamus detects rice in bacterial invasion, switches on antibody production and heats up the system to speed it along 3. evolutionary mechanism for ensuring others are aware of illness so that they dont get infected too. 4. to ensure the person feels damn ill so the body can rest conserving energy so immune response can work better take your pick!
904312
Lower temperatures reduce rates of reactions. This includes ezyme reactions in the foods that cause them to further ripen and spoil and growth of bacteria that can cause spoilage and food poisoning. It also keeps insects off the food and dust.
372891
98 degrees F is the temperature at which most(if not all) of the of the enzymes in the human body work most efficiently. The body raises temperature as a response to pathogens as a way of creating an environment that is unsuitable for the pathogen, and hopefully destroying it and ridding the body of it.
64455
mould or any microorganisms require  various  enzymes to carry out difernt unction and these enzymes work best at a perticuklar temperatour if the temperatur goeslower or above the growh is hampered and thus wen the mould is kept in fridge their enzymes dont wrk to the maximum capacity their ability to wrk gets weeker and thus the grown is also slow...... i gess u  got the reuired explanaion
184033
theres a whole bunch of conspiracy theorys on this if you search around.  I found this one article though that was kind of interesting http://archives.cnn.com/2002/WEATHER/05/27/bugs.weather/index.html\n\nif we can use microbes to make medicine why not control the weather with them... really both concepts are pretty crazy but the medicine one is already done.