A new glycoside from Polygala tenuifolia Willd

A new tdterpenoid glycoside, 3-β-O-β-D-glucopyranosyl presenegenin 28-O-α-L-arabipyranosyl（1 → 3）-6-β- xylopyranosyl（1 → 4）-[β-D-apiofuranosyl（1 → 3）]-Ct-L-rhamnopyranosyl（1 → 2）-[α-L-rhamnopyranosyl（1 → 3）]-β-D-fucopyranosyl ester （1） was isolated from the Polygala tenuifolia Willd., together with two known saponins, including polygalasaponinXXIV （2） and polygalasaponinXXVIII （3）. The structure of new compound was elucidated by spectroscopic methods.     

Two new secoiridoid glycosides from the roots of Picrorhiza scrophulariiflora

From the roots ofPicrorhiza scrophulariiflora, two new secoifidoid glycosides, named picrosecosides Ⅰ and Ⅱ （1, 2） have been isolated. Their structures were elucidated on the basis of chemical and spectropic evidences.     

以实际问题解决吸引学生主动选修化学——校本课程“化学与考古”的案例分析

提升化学对学生的吸引力是促使学生选修化学、落实化学核心素养的前提。以校本选修课程“化学与考古”为例,从现代技术、物质性质、实验装备、反应原理、工艺、生物化学等多角度用化学知识解决考古与文保疑难,将抽象的化学知识落实到考古事例中探讨,主动创设情境帮助学生体验化学的魅力,为普高教学中化学知识的实用化提供新的视角。     

百年诺贝尔化学奖与生物化学的发展

从1901年首次颁发诺贝尔奖以来,有39次化学奖颁给了生物化学领域。诺贝尔化学奖的颁发既反映了百年来生物化学发展取得的巨大成就,也有力地推动了生物化学从叙述生物化学阶段向动态生物化学和机能生物化学阶段的不断迈进,促进了生物化学学科的快速发展。     

Theoretical Studies on Electronic Spectra and Second-order Nonlinear Optical Properties of Glucosyl Substituted Barbituric Acid Derivatives

AMI semi-empirical method was used to optimize the barbituric acid derivatives substituted with glucosyl B1-5 （series B）, and the thiobarbituric acid derivatives substituted with glucosyl T1-5 （series T）. Based on the optimized structures, INDO/CI method was adopted to calculate the electronic spectra. Meanwhile, the second-order nonlinear optical （NLO） coefficients βμ were calculated with the sum-over-state （SOS） formula. The results show that when the number of glucosyl units was increased, ｜βμ｜ values of the barbituric and thiobarbituric acid derivatives were both enhanced, especially for thiobarbituric acid derivatives. It indicates that non-conjugated substituted group could also improve NLO properties of materials when the number of repeated units was increased. Additionally, the absorption bands appearing in UV area are consistent with the proper change of the number of glucosyl units, and consequently it can be concluded that the high transparencies of all systems were scarcely varied.     

聚合物粒子在生物化学与生物医学中的应用

就亚微米和单粒径两种新型的聚合物粒子在生物化学与生物医学如免疫分析、药物载体、真核细胞、原核细胞及生物大分子产品等的分离等领域中的最新应用进行了综述。     

A new alkaloid from Castanea mollissima Blume

A new alkaloid, named 6-（2＇,3＇-dihydroxy-4＇-hydroxymethyl-tetrahydro-furan-1＇-yl）cyclopentadiene[c]pyrrole-1,3-diol, was isolated from the seeds of Castanea mollissima Blume. The structure was elucidated based on spectroscopic evidence including 2D NMR techniques.     

磷酸化蛋白质组分析的数据处理新方法研究(Ⅰ)

蛋白质可逆磷酸化在胞外信息传递到核内、细胞生长、分裂、分化和代谢等生命活动过程中起着关键的作用。蛋白质磷酸化对众多蛋白质生物化学功能担负着开/关调控责任,是一种普遍的调控机制,与各种生命活动息息相关。因     

人是怎样走路的

指出了人走路时静摩擦力不做功,分析了静摩擦力在人走路过程中所起的作用,同时解释了人走路过程中机械能增加的原因.     

EXAFS study on the local atomic strucures around iron in glycosylated haemoglobin

Samples with 5.1%9.8% and 15.3% HbA1c were extracted from normal subjects and patients with slight and serious diabetes respectively.Extended x-ray absorption fine structure spectra of Fe K absorption were collected at the EXAFS experimental station of the Beijing Synchrotron Radiation Facility.The step-by-step fluorescent mode was employed with a count time of 10s per point.Several independent scans were averageed to eliminate the statistical nosie.Reference backscattering amplitudes and phaseshifts were calculated using the curve wave theory (FEFF code) of EXAFS.Apart from the nitrogen neighbors around the central iron atom,oxygen neighbours are also found.The Fe-Nbond length increases by about 0.02A for the sample with 15.3% HbAlc Compared with the others,but the Fe-Obond length is almost unchanged.With increasing of HbAlc concentration,the content of Hb increases and the content of HbO2 decreases.This demonstrates that the glycosylation of haemoglobin will decrease its ability to carry oxygen.