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Biopharma生物显微镜LyoStat5的工作原理介绍
生物显微镜LyoStat5的使用方法?
BiopharmaLyoStat5多少钱一台?
生物显微镜LyoStat5可以检测什么?
生物显微镜LyoStat5使用的注意事项?
BiopharmaLyoStat5的说明书有吗?
Biopharma生物显微镜LyoStat5的操作规程有吗?
Biopharma生物显微镜LyoStat5报价含票含运吗?
BiopharmaLyoStat5有现货吗?
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竹子高沸醇溶剂法制备纸浆纤维与木质素的研究
以竹子为原料,在70%~90%的 1,4-丁二醇 水溶液中添加少量 助剂,并在180~200 cc 条件下反应30~90 min,制备得到竹子纸浆纤维和高沸醇木质素高沸醇溶剂(HBS )法制得的竹子纤维经进一步改性可用于造纸或加工成其他纤维素产品,高沸醇木质素较好地保持了木质素的化学活性,灰分含量低于小质素磺酸盐,在材料科学与工程领域有潜在的应用前景高沸醇溶剂1,4-丁二醇经回收处理可以循环使用。
造纸/印刷/包装
2023/11/09
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疫苗的冷冻干燥-在配方和工艺开发中的挑战和概念
Vaccination prevents millions of deaths from infectious diseases per year; however, there are still millions of people who die from these diseases due to weak thermostability demanding cold chains, long-term stability issues and distribution challenges. All these limitations can be overcome by creating a dry product through lyophilization. With the urgency to develop a coronavirus vaccine, it is a crucial time to discuss the process of freeze-drying vaccines.
486KB
2022/04/29
冻干机设备性能的测量:两种方法的比较
The objective of this investigation was to evaluate two methods for measuring the maximum sublimation rate that a freeze-dryer will support—the minimum controllable pressure method and the choke point method. Both methods gave equivalent results, but the minimum controllable pressure method is preferred, since it is easier, faster, and less subjective. The ratio of chamber pressure to condenser pressure corresponding to the onset of chokedflflow was considerably higher in this investigation (up to about 20:1) than in previously published reports. This ratio was not affected by the location of the pressure gauge on the condenser; that is, on the foreline of the vacuum pumpversuson the body of the condenser itself. The total water loss due to sublimation as measured by tunable diode laser absorption spectroscopy was consistently within 5% of gravimetrically determined weight loss, regardless of whether the measurement took place during chokedversusnon-choked process conditions.
955KB
2022/04/29