what is a sample of a diatom and  where could i find it?
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They are unicellular organisms. They can be found at the end of the winter, when they are most numerous, in fresh water. They will cover surfaces of aquatic plants or poles and wooden borders of ponds. If you like to study them you can scrape the brown growth with a flat piece of plastic. You can also use a sponge.
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Check the source that i put down there. you can find it there.
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It's an empty metallic cylinder to get samples of water (from the sea). The cylinder is lowered on the water open. When it is at the desired depth, a "messenger" is droped from the ship down the cable. When the messenger impacts the bottle it releases a mechanism that closes the bottle with a sample of water inside.
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Try the link in the source. I think that is good enough for  a preliminary search!
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Google "unicellular organisms" and most of them will be found in water.\n\nPlankton is the most common as it is the food source for all the other simple cellular organisms in the water.
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Blue-Green Algae.\nThis algae consists of simple cells without definite nuclei (cell\ncentres). They form slimy growths in shallow parts of lakes and ponds,\nand sometimes thickly carpet the bottom of pools. Some forms may\ngive unpleasant tastes and odours to water. One such "blue-green"\nalga, which is actually red in colour, gives the Red Sea its colour. This\nalgae is unicellular.\nGreen Algae.\nThis algae consists of cells that have definite nuclei. They also have\nchloroplasts, or green bodies containing chlorophyll. Green algae\ngrow mostly in bodies of fresh water. But they may live almost\nanywhere that is moist and cool, if there is enough light. Both green\nand blue-green algae may accumulate in great quantities and colour an\nentire lake. These growths are known as "water blooms." They\ndevelop and disappear in a few days. Green algae serve as food for\nfishes. This algae is unicellular.\nBrown Algae.\nThis algae group include the largest as well as many small algae.\nSome forms can be seen only with a microscope. Others grow as long\nas 200 feet. Many have structures that resemble leaves, stems, and\nroots. Brown algae are usually found in saltwater, and are called\nseaweeds. Kelps are brown algae attached to rocks near shore. Other\nkinds, such as the gulfweed, may form floating mats in the ocean.\nBrown algae are a source of food, vitamins, iodine, and fertilizer. This\nalgae is both unicellular and multicellular.\nRed Algae.\nThis algae are not as large as the browns. They have complex\nreproductive structures. Red algae usually grow in the ocean,\nespecially in subtropical seas. They often grow with corals to form\nreefs. Red algae supply agar-agar, an important substance used in\nbacteriology laboratories. The Irish moss is a red algae which can be\neaten. This algae is unicellular in only one questionable genus.
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go to http://biospectrumindia.com/content/BSTOP20/10601115.asp
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one way is chlorophyll fluorimetry,a method of studying light absorption by photosynthetic pigments in marine algae.\nthis sight might help good luck.
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go here\n\nxpthemes.com
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Leeuwenhoek Microscope, pretty sure this is it. If you want a pic of it and description  visit the site i found on it.
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Many of the microorganisms in the pond water are actually plants.\n\nThe microscopic organisms living in the water column are usually refered to as plankton.  The phytoplankton are the microscopic plants, while the zooplankton are the microscopic animals.  The phytoplankton are the majority of the mass, mostly single celled algae and diatoms.
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get online and search for samples....printing companies, etc.
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I found something in biology:\n\nEtymology: ultimately from Greek diatomos cut in half, from diatemnein to cut through, from dia- + temnein to cut -- more at TOME\n: any of a class (Bacillariophyceae) of minute planktonic unicellular or colonial algae with silicified skeletons that form diatomite
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http://www.bacterio.cict.fr/bacdico/aa/alcaligenaceae.html\n\nhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8708376&dopt=Abstract
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The Bacillariophyta are the diatoms. With their exquisitely beautiful silica shells, or frustules such as that of Odontella diatoms are among the loveliest microfossils. They are also among the most important aquatic microorganisms today: they are extremely abundant both in the plankton and in sediments in marine and freshwater ecosystems, and because they are photosynthetic they are an important food source for marine organisms. Some may even be found in soils or on moist mosses.bacillariophyta are Autotrophic and they eat brown chloroplasts.Autotrophic means that they are capable of utilizing inorganic carbon as the main source of carbon and of obtaining energy for life processes from the oxidation of inorganic elements (chemotrophic) or from radiant energy (phototrophic).
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www.discoveringfossils.co.uk
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Try \nhttp://www.cipe.org/publications/fs/ert/e24/Agarwe24.htm