what is the color of plain nutrient broth and nutrient agar?
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normally it is a translucent gel that appears to have a slight brown yellow tint.
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Total Volatile Nitrogen\nhttp://www.omegaproteininc.com/products-natural-nautic.html
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Selective media is used to select for the growth of a particular type of organism. They usually have a specific pH or component that inhibits the growth of certain organisms. MacConkey agar contains bile salts and crystal violet which inhibits the growth of Gram positive organisms. Eosin Methylene Blue agar (EMB) is also selective for Gram negatives. Phenylethlene agar (PEA) is selective for Gram positives and so is Mannitol Salt Agar (MSA). Hope that helps.
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Bacteria are translucent so they must be stained to visualize with a light microscope. You can use numerous stains (crystal violet, methylene blue, safrinin) to color them so they can be seen.
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Ordinary starch will yield a blue colour with iodine.\n\nThe best iodine indicator (other commercial material like Vitex etc) can be made by dissolving 5 g of soluble astarch in 100 mls of boiling water. Mix raidly to dissolve. Make up to one litre with good quality water. Add one pellet of NaOH or KOH and add a few drops of 0.1% phenolphthalien indicator. When the colour disappears, discard it and make up fresh.
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To detect starch just add some drops of iodine to the substance you want to test. Iodine is yellow/brown and turns dark blue/black in the presence of starch. As for fat, just rub your substance if it is a solid on a piece of paper or place a drop of it on the paper if it is a liquid. If the substance leaves a translucent stain on the paper( stain that does not evaporate) then it has fat.
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By size, color and many other things.\nPlease check this link http://www.fao.org/docrep/field/003/AB726E/AB726E14.htm\nIt has lots of info about that!
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light violet [cool,calm] & white [purity]
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Soft agar?  Agar is a polymer of galactose.  It is a nutrient.  When used to promote bacterial growth or isolation, additional minerals and other chemicals are usually added.\n\nAdditional details can be found at the site listed below:
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It's funny to know that most of us think green bowel is disgusting & that were either dying or very ill. But contrary to popular belief, you want your bile a bright green. Yellow, orangish, & brown colored bile represent toxin accumulation in your body.
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It can be a powder, but that's usually cheap bunk shit thats around $10 a gram. It can look like a salt, most of it technically is(hydrochloride), anywhere from tiny uniform shards that are almost white because theyre so small, to bigger broken up shards that are clear with white in the cracks where they broke it up, to big fist sized shards that are clear. It can also be a dirty green or tan transparent which indicates the anhydrous ammonia wasn't cooked out all the way, or light pink transparent that actually can mean it's pretty good purity but the cook put in a small impurity to turn it that color kinda like a trademark.
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Yes. It produces a bright yellow precipate:\nAgNO3 (aq) + KI (aq) → KNO3 (aq) + AgI (ppt)
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What are you trying to stain them with?\n\nYou haven't provided enough information to answer the question. \n\nMy best guess is that the microorganisms are gram negative and you're using a stain that only gram positive organisms can pick up.
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Crystal Violet \nIodine Solution  \nEthanol\nSafranin \nWater \n\nGram -ve = pink\nGram +ve = purple
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NINHYDRIN TEST\n(glycine)Purple liquid\n(gelatin)Clear, colorless liquid\n(albumin)Bluish liquid with purple cloudy layers\n(tyrosine)Violet liquid\n(casein)Powder-like precipitate at the bottom light purple liquid.\n\nNinhydrin test is a product of the unusual reaction is a purple colored imino derivative, which provides as useful color test for the proteins or amino acids. The purple color indicates the presence of proteins on amino acids. Since the entire reagent gave the result of a violet color so all the reagents are proteins.
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Silver nitrate. \nThe Ag(+) is silver, and the NO3(-) is nitrate. \nDon't get this stuff on your hands; it stains!
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AgNO3 + NaCl => AgCl(white ppt) + NaNO3\nAgNO3 + KI => AgI( yellow ppt) + KNO3\n\nthere is a change of color because AgI is produced