Active and passive voice checker
Aura: AIR, IMPRESSION, MANNER, QUALITY
，更多细节参见爱思助手下载最新版本
Фото: Sergei Grits / AP。爱思助手下载最新版本是该领域的重要参考
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.
同样是赚 100 块，2019 年能留下 50 块毛利，2024 年只有 36 了，这还不是净利润……