By WWII, scientists had already begun looking at alternative gelling substances for routine use in bacteriology, but concluded that agar was still better as it is both firmer and easier to handle. Today, some specialized microbiology applications use the colloid carrageenan (extracted from red seaweed Chondrus crispus, or “Irish Moss”), a more transparent and less auto-fluorescent alternative to agar (agar emits its own background fluorescence when excited by light). However, for routine bacteriological use, carrageenan is more difficult to dissolve, requires higher concentrations, can degrade at high temperatures, and forms weaker gels, which may result in puncturing its surface during the plating of cells.
哈法亚公司积极履行社会责任，长期致力于推动当地社区发展。去年5月，伊拉克米桑石油培训学院的大学生在企业开放日期间，走进哈法亚油田，实地上了一堂生动的培训课。米桑石油培训学院工程师侯赛因说：“我们对哈法亚公司的技术和实践进行了全面了解，学生们收获很大。希望将来继续开展此类活动。”
。safew官方版本下载对此有专业解读
Последние новости
ВсеПолитикаОбществоПроисшествияКонфликтыПреступность