eg. tig, mig, oxy, arc etc
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all welding uses a heat source to melt the parent metal, parent metal is the metal you are trying to weld.\nWhen the metal melts, it can absorb gas from the air. This is not good, oxygen causes corrosion and hydrogen creates bubbles is the metal which weakens it. So when you weld you need to doo something to keep these gases out.\nOxy-acetalence or oxy-l.p.g. welding uses a gas flame to melt the paretn metal. The ratio of oxygen to acetalene or l.p.g. is critical for burning cleanly and not get oxygen in to the weld. Additional metal is applied by a filler wire, dipped in manually by the person welding.\n\nM.I.G. and T.I.G. use an inert gas (the I.G. in their name) to keep the other gases out.\n\nStick welders (manual metal arc) uses the flux around the welding rod to create a suitable atmosphere around the weld pool.\n\nmig, tig and arc use an electric current to melt the parent metal\n\nwith mig, the machine feeds extra metal in to the weld the whole time.\n\nwith arc the welding rod supplies extra metal\n\nwith tig the operator adds filler wire manually as required.\n\nTig does the nicest welds but it the most expensive as it is slow.
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try pharmamanufacturing.com
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Killers, OC, Oxy, OxyCotton, Oxy80
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http://www.eng-tips.com/index.cfm
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Look up:\n\nwww-WeldingAnswers.com
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Steve Gibson has some great examples and utilities.\nhttp://www.grc.com/smgassembly.htm
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http://www.exrx.net/Lists/ExList/WaistWt.html
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they are called allotropes.  An example is diamond, and graphite. Both are pure carbon, but the bonding structures are different.  another example is O2 (oxygen gas) and O3 (ozone gas). Both are pure oxygen but the molecules are different.
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Congrats, I am working on my thesis too.  There is PDA (potato dextrose agar), V8 agar (made from guess what, V8) and many others.  Each is designed for a specific purpose.  I am not an expert on this, but try a search engine.
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as there are SO many...i think the site i sent you in the source is going help you out.  It breaks it all down in categories so you can be a little more specific in your needs.  Good luck :-)
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http://www.edgesystem.net/oxymax.html\nhttp://www.diamondskin.com/DiamondSkin_Oxygen_Therapy.html\nhttp://www.asseenontv.com/prod-pages/oxygen_facial_system.html\nhttp://www.promolife.com/products/oxybar.htm
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this her may help ya out. check it out!http://www.doh.com/sp_other.html
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try this\n\nhttp://en.wikipedia.org/wiki/Category:Laboratory_equipment
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The link below  may help. There are many more. To get to them, enter "manufacturing core" in the search bar.
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Here is their products page.\n\nhttp://www.cpchem.com/enu/products.asp
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There's quite a few. Just google solubility chart. Here's one I found.
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try healthsouth or TIRR