2020年1月1日 · 20 (R)-人参皂苷具有抗肿瘤、抗氧化、抗疲劳、神经保护和破骨细胞生成抑制等作用。 由于其化学结构、药理和立体选择性特性，20 (R)-人参皂苷近年来引起了广泛的关注。 本研究总结了20 (R)-人参皂苷的发现、鉴定、化学差向异构化、微生物转化、药理活性和代谢。 Ginseng has been used as a popular herbal medicine in East Asia for at least two millennia.

The C20 configuration of 20(R)-ginseng saponins are usually determined by 13 C NMR and X-ray single-crystal diffraction. 20(R)-ginseng saponins have antitumor, antioxidative, antifatigue, neuroprotective, and osteoclastogenesis inhibitory effects, among others.

Results: E. coli engineered with GT95 syn selectively transfers a glucose moiety to the C20 hydroxyl of 20 (R)-PPD and 20 (R)-PPT to produce 20 (R)-CK and 20 (R)-F1, respectively. GTK1- and GTC1 -modified E. coli glycosylated the C3-OH of 20 (R)-PPD to form 20 (R)-Rh2.

2020年1月1日 · The C20 configuration of 20 (R)-ginseng saponins are usually determined by 13 C NMR and X-ray single-crystal diffraction. 20 (R)-ginseng saponins have antitumor, antioxidative, antifatigue, neuroprotective, and osteoclastogenesis inhibitory effects, among others.

In general, the present study demonstrated that GT95 syn could glycosylate the C20—OH of PPD, and the C20—OH and C6—OH of PPT in E. coli host cells. We also proved that GTK1 could glycosylate the C3—OH of PPD, and the recreated two-step glycosylation pathway via combination of GT95 syn and GTK1 implemented the biosynthesis of F2 from ...

JGR: Solid Earth publishes original research articles on the broad field of solid Earth geophysics, petrology, geochemistry, mineralogy, tectonophysics, natural hazards, and volcanology.

2022年4月27日 · 本文提出的jgr-p2o方法将三维手姿估计问题转化为密集像素到偏移量的预测，充分利用了深度图像的2.5d特性。 以深度图像为输入，输出图像中 关节的位置 ( 即uv坐标 )和 深度空间 ( 即z坐标 )。

水工建筑物大体积混凝土普遍采用90d或180d龄期，故在C符号后加龄期下角标，如C9015，C9020指90d龄期抗压强度标准值为15MPa、20MPa的水工混凝土强度等级，C18015则表示为180d龄期抗压强度标准值为15MPa。 计量单位的变化 过去我国采用公制计量单位，混凝土强度的单位为kgf/cm2。 现按国务院已公布的有关法令，推行以国际单位制为基础的法定计量单位制，在该单位体系中，力的基本单位是N（牛顿），因此，强度的基本单位为1 N/m2，也可写 …

We offer reactors in different specifications, ranging in volume from 500 ml to 200L, and they can be configured with complementary systems such as vacuum pumps and high/low-temperature equipment.

• C20 is observable by GRACE but it is corrupted by tide-like aliases (S1, S2, …) • Source is uncertain but likely due to thermal variations on the s/c • SLR provides critical replacement estimate • Updated time series indicate dramatic changes in C20 relative to long-term trend