what are bacteria using for nutrient in nutrient agar? what the purpose of the agar?
822279
The bacteria use the starches and carbohydrates in the agar to multiply. The purpose of agar is to be a universal growth medium for all bacterial colonies to grow
447342
think of it as a bacteria...bacteria is a living organism...if you disinfect it will it not die?does bacteria think?does bacteria feel pain and what not?\n\nveggies live off water/sun/nutrients just as we do.veggies begin to rot bebore dead/wasted.\nhumans rot after death...\n\nwhat will you do?\nwhat will you think?
818272
There is an optimal evirnment for bacteria growth. Honney is too sugary (too much food) and pickels have too much acid in the liquid. This does not mean that they will never grow though.
151470
depends on what classes of microbe you are reffering to: aerobic (needs oxygen) or anaerobic (oxygen is poison to them). Most all microbes love molasses and high starch items like rice. These substrates offers a wide spectrum of minerals and sugars. The minerals provide "enzyme bridges" for different kinds of microbes to exist "happily" together (even aerobes and anaerobes).
777489
Because some bacteria produce spores as a way of encapsulating their genetic material in times of stress, and as they are dying. New, rapidly dividing cells in a new , nutrient rich, culture do not need to produce spores. As the nutrients are used up, the bacteria will begin to produce spores to conserve the genetic material. These spores will lay dormant until placed in the correct environment, and will then revive to grow into new bacteria. Some spores can survive autoclave sterilisation in this way - so its a very effective species survival strategy.
466080
they r :\nsolid media (in which agar is added)\nliquid media (no agar added)\nsemi-solid media (agar added so that it is just semi-solid)\n\nright??\n\n[P.S - when do i get voted for "best answer"??]
279665
c) The metabolic purpose of fermentation is to ...regenerate NAD+ from NADH.
931567
the bacteria's cell membrane is semi permeable to certain molecules.  bacteriacides probably have some form of "nutrient" in them to confuse the bacteria into taking it in.  It is sort of like rat poison.
337172
If you mean a round, whitish colony like you see in petri dishes, it's because they require moisture, salts, and nutrition to divide rapidly and maintain that kind of population.  You *will* find colonies of bacteria anywhere that those conditions apply, such as in the mouth, in decomposing animal and plant matter, in stagnant ponds, etc.  There are small, microscopic, colonies and single bacteria everywhere, waiting to exploit that situation.
142615
Tryptic Soy Agar. It's the basic medium (food in a petri dish or test tube) for growing bacteria.
825715
Bacteria are involved in decomposition, fixing Nitrates into the soil and digesting plant matter in the guts of herbivorous animals, for starters. Without this crops wouldn't grow, animals couldn't eat them and dead bodies wouldn't break down.
269855
Its a good medium to grow bacteria and allows them to clearly be seen. Also,its relatively inexpensive to make agar.
917922
Well, if you want to measure their growth in milk you need:\n\nPure culture of the bacteria in question, sterile milk, sterile glass tubes and a spectrophotometer.  This will measure the density of the bacteria in liquid culture.  I don't know what equipment you have access too (pipetts, tubes, a spectrophotometer etc).\n\nIf you've isolated the bacteria from milk and want to just measure their growth in "whatever", you can use any sterile growth medium that supports the growth of the isolated bacteria.  Again, measuring growth is most easily accomplished by use of a spectrophotometer.  \n\nGrowing bacteria on a plate to decide which grows faster is fairly insane, unless they have significant differences in growth.  I mean, are you going to stare at an agar plate for 24 hours just to see that at 14 hours 5 minutes a tiny pinpoint on plate A was visible, but it took 15 hours and 22 minutes for a colony of the same size on plate B?  No, of course you're not, it's not even plausible.\n\nWith liquid culture, you can take readings every hour for 8 hours and at 24 hours or something.\n\nYou can also dilute and spread-plate the bacteria from liquid cultures onto agar plates if you have your heart set on using them and achieving an exact count for bacterial populations.  But use of a spec still allows for comparisons between species, even without an exact population number.
415279
Nutrient broth ingredients:\n\nMeat extract 10.0 gm\nPeptone 10.0 gm\nSodium chloride 5.0 gm\nDistilled water 1000 ml\nMix the ingredients and dissolve them by heating in a steamer. When cool, adjust the pH to 7.5-7.6.\n\nTo make it agar add:\nTo the ingredients as in nutrient broth, add 15 gm agar per litre. Dissolve the agar in nutrient broth and sterilize by autoclaving at 121oC for 15 minutes. Prepare plates and slopes as required.
695553
Agricultural Applications - radioactive tracers\n\n\nRadioisotopes can be used to help understand chemical and biological processes in plants. This is true for two reasons: 1)radioisotopes are chemically identical with other isotopes of the same element and will be substituted in chemical reactions and 2)radioactive forms of the element can be easily detected with a Geiger counter or other such device.\nExample:\nA solution of phosphate, containing radioactive phosphorus-32, is injected into the root system of a plant. Since phosphorus-32 behaves indentically to that of phosphorus-31, the more common and non-radioactive form of the element, it is used by the plant in the same way. A Geiger counter is then used to detect the movement of the radioactive phosphorus-32 throughout the plant. This information helps scientists understand the detailed mechanism of how plants utilized phosphorus to grow and reproduce.
946462
Media is used to grow bacteria cultures, and a loop is stuck into a sample and then rubbed on the media in order to "plate" a sample.\n\nSome bacteria and microorganisms are easily identifiable when allowed to culture and gorw into a colony.  Also, some produce useful substances when grown.  For this reason, a loop is placed into a sample and rubbed on a plate with media.
639672
Microbiology \n \nAmericans are fascinated by world records. The Guiness Book of World Records is a very popular text because we are interested in the biggest and the best of everything. \n\nIn the late '80s a Dr. Fishelson found a very unusual bacterium called Epulopiscium fishelsoni. This bacterium lives in the gut of a Red Sea surgeonfish. This bacterium can grow up to 600 micrometers long and 80 micrometers wide. The average Epulopiscium fishelsoni is 250 micrometers long and 40 micrometers wide. Six hundred micrometers is a little over a half a millimeter. A millimeter is about as long as the period in the box below. \n\n1millimeter=. \n\nThe human eye can see things as small as 200 micrometers, making this bacteria the first one to actually be visible to the naked eye. To give you a better idea of how big this bacterium really is, "normal-sized" bacteria are only about 0.2 micrometers to about 1.5 micrometers in length or diameter. \nIn the microbial world a record has finally been broken for the biggest bacteria in the world. The record holder for the biggest bacteria recorded on the earth is now (drum roll please): Thiomargarita namibiensis. This behemoth of bacteria is round rather than rectangle like Epulopiscium fishelsoni. It averages about 180 micrometers in diameter. The largest cells have been measured at 750 micrometers. On a cell volume basis the largest Epulopiscium fishelsoni is .003 millimeters cubed. However, Thiomargarita namibiensis' largest cells have an enormous volume of 0.22 millimeters cubed. \n\nNot only is Thiomargarita namibiensis a giant but it is also very unusual. It utilizes sulfates and nitrates to get its energy. This bacteria found off the coast of Namibia is in the sediment at the bottom of the ocean. Basically, Thiomargarita namibiensis gets necessary electrons from sulfates. It then uses nitrates to grab onto the electron instead of oxygen. Those electrons are eventually used to generate energy for the cell. It gets its enormous size because it stores huge amounts of nitrates to hold onto these electrons. It needs to store the nitrates because nitrate levels are very low in these waters most of the time. It isn't until a major storm stirs up the mud at the bottom of the ocean that Thiomargarita namibiensis can get the nitrates it needs. \n\nWhen nitrates are around, these bacteria literally stuff themselves with nitrate. In essence they are a huge ball of nitrates with a very thin layer of cytoplasm (cytoplasm contains all the necessary stuff for bacteria to live, grow, and reproduce) around this nitrate. \n\nThis bacteria may prove useful in other areas of the world's oceans. \n In waters contaminated with nitrates from fertilizers and sewage these organisms may be useful in taking up these nitrates. If too much nitrate is in the water, algae in the water will grow out of control and kill or chase away other inhabitants in the area. Thiomargarita namibiensis could be placed in these nitrate rich waters to remove them and prevent the algae from growing out of control. There needs to be a lot more work done on this unique bacterium. Researchers have yet to get it to grow in a test tube. However, in time this giant among bacteria may be tamed and utilized to help in other areas of the world. \n \nFor more information go to the Science(April 16, 1999, vol. 284, No.5413, pages 415 and 493-495) article. You can't get all the information from the online version unless you are a subscriber. On the other hand, the cover of that issue has a picture of this mighty bacteria. \n\nTake Care and Think Microbiologically!