free version has limited features
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.
。关于这个话题，服务器推荐提供了深入分析
「像鬼一樣工作」：台灣外籍移工為何陷入「強迫勞動」處境，推荐阅读搜狗输入法下载获取更多信息
Санкт-Петербург едва не поставил новый метеорекорд. Об этом в своем Telegram-канале рассказал ведущий специалист центра погоды «Фобос» Михаил Леус.