以前，村里一些旱地靠天吃饭，村民们期盼能建成旱作高标准农田；牛羊价格波动等风险让村民们心里不踏实，希望能有专门的畜牧保险；村里老人多，做饭难、吃饭难等问题十分突出……这不仅是黄旗滩村村民的急难愁盼，也是西部地区许多农村都面临的难题。
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Guar gum, a plant colloid, costs less than agar and is better suited for growing thermophilic bacteria, but is also more difficult to handle, being more viscous and less transparent. The bacterial polysaccharide xanthan is cheaper as well but forms weaker jellies that, as with carrageenan, might result in puncturing its surface. Other colloids, like alginate (from brown seaweed) and gellan gum (from a bacterium), don’t set solely based on temperature and require additives for gelation. These additives might interfere with microbial growth and make the preparation of those jellies less handy than agar plates.