Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.
（一）刻划、涂污或者以其他方式故意损坏国家保护的文物、名胜古迹的；
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const byobRequest = controller.byobRequest;
同时，维信诺的第四代发光材料 PSF（磷光敏化荧光）配合 OLED 叠层架构，已经通过调整不同发光层的出光角度实现防窥，原理同样非常底层。
Via iFi's companion Nexis app on Android, the GO Link 2 can also be updated on the go and further customized with digital filters. The GO Link 2 supports two digital filters — one hybrid and one linear — so that you can adjust things to your preferred sound profile. You can also use the Nexis app to set volume limits when you're listening with the DAC attached.