用近红外无损肌氧及运动心率检测技术评定100m极量强度运动对心脏冲击影响

利用连续双波长近红外光技术测量肌肉中血红蛋白含氧量的变化情况,同时应用运动心率无线实时采集设备,设计了检测实时肌肉组织血氧含量和瞬时心率实验方案,对6名健康男性进行了100 m跑同步实测实验。实验表明,肌肉组织氧合血红蛋白浓度在100 m跑结束后继续降低,达到最低值的时刻滞后于运动结束时刻的时间为(6.65±1.10)s;心率则在运动结束后继续上升,达到最高值的时刻滞后于运动结束时刻的时间为(8.00±1.57)s。这些结果显示了双波长近红外光组织氧测试技术和运动心率无线实时采集系统能够正确检测极量强度运动时的血氧参数和心率,揭示了极量强度运动过程中肌肉中氧运输与消耗的过程及其与心率之间的动力学特征。     

MECHANICAL PROPERTIES OF SMC WHISKER REINFORCED HIGH DENSITY POLYETHYLENE COMPOSITES

A new type of SiO_2-MgO-CaO (SMC) whisker was used to modify high density polyethylene (HDPE).The melting behavior and crystallinity were investigated by differential scanning calorimetry (DSC).The dispersion of whiskers and interfacial adhesion in the prepared HDPE/SMC whisker composites were investigated by scanning electron microscopy (SEM).The mechanical properties were evaluated by mechanical tests and dynamic mechanical analysis (DMA).DSC data indicated that the melting temperature and the crystall...     

Molecular Cloning and Characterization of a New Cold-active Extradiol Dioxygenase from a Metagenomic Library Derived from Polychlorinated Biphenyl-contaminated Soil

To find new extradiol dioxygenases(EDOs, EC 1.13.11.2), a metagenomics library was constructed from polychlorinated biphenyl-contaminated soil and was screened for some dioxygenase with aromatic ring cleavage activity. A novel EDO, designated as Bph­C_A, was identified and heterologously expressed in Escherichia coli. The deduced amino acid sequence of BphC­_A exhibited a homology of less than 60% with other known EDOs. Phylogenetic analysis of BphC­_A suggests that the protein is a novel member of the EDO family. The enzyme exhibits higher substrate affinity and catalytic efficiency toward 3-methylcatechol than toward 2,3-dihydroxybiphenyl or catechol, the preferred substrate of other known EDOs. The optimum activity of purified Bph­C_A occurred at pH=8.5 and 35℃, and Bph­C_A showed more than 40% of its initial activity at 5℃. The activity of purified Bph­C_A was significantly induced by Mn²⁺ and slightly reduced by Al³⁺, Cu²⁺ and Zn²⁺.     

Biostimulation-enhanced Biodegradation of Nitrobenzene in Contaminated Groundwater

In this study, biostimulation technology was used for bioremediation of nitrobenzene-contaminated groundwater by adding a mixture of lactose and phosphate, peptone, and beef extract. During the process of biostimulation, the remediation effectiveness, microbial dehydrogenase activities and microbial densities were investigated; the varieties of microbial community structure and composition were analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis(PCR-DGGE) technique and the relative abundances of nitrobenzene-degrading gene(nbzA) were determined by fluorescence quantitative real-time PCR(RT-PCR). Findings show that the removal rate of nitrobenzene in groundwater could reach about 60% by biostimulation with lactose and phosphate, 70% with peptone and 68% with beef extract. The microbial dehydrogenase activities and microbial densities were all improved obviously via biostimulation. The results of PCR-DGGE show that the microbial diversities were improved, and more than ten kinds of dominant microorganisms were detected after biostimulation. RT-PCR results show that the relative abundances of nbzA gene of microbes in groundwater were increased significantly, which indicated that biostimulation actually enhanced the growth of nitrobenzene-degrading bacteria. Therefore, biostimulation is a cost-effective and feasible bioremediation technique for nitrobenzene-contaminated groundwater.     

聚合氯化铝的制备及在微污染水处理中的应用

用酸溶法制备聚合氯化铝,对合成产品进行红外光谱分析,并应用于微污染原水的处理。处理微污染原水结果表明:当投加量为40.0 mg/L,pH值为6.0～9.0时,剩余浊度达到1.0NTU以下,总有机碳(Total Or-ganic Carbon,TOC)去除率达到41.2%。对比试验结果表明自制的聚合氯化铝的除浊效果优于一些常见工业聚合氯化铝。     

概率统计实验课初探

讨论了开设概率统计实验课的一些方略,并给出了一些有用的范例.     

A new diaryl 1, 2-diketone from the heartwood of Dalbergia latifolia

A new diaryl 1,2-diketone, named 1-(2,5-dihydroxy-4-methoxyphenyl)-2-phenylethane-1,2-dione (1), along with eight known compounds (2–9), were isolated from the heartwood of Dalbergia latifolia. They were identified on the basis of spectral data. Compounds 1–7 were obtained from the Dalbergia genus for the first time. Compounds 8 and 9 were firstly isolated from the plant. Compound 1 exhibited inactive against Staphylococcus aureus ATCC 6538 and Escherichia coli ATCC 21530 with the minimum inhibitory concentrations of 10.0 and 10.0 mg/mL, respectively.     

Chemical Modification and Fluorescence Spectrum of Tryptophan Residues in Pullulanase

IntroductionPullulanase(E.C.3.2.1.41)is a debranchingenzyme that can hydrolyze theα-1,6glucosidic bondsin pullulan,amylopectin,andβ-limit dextrin[1].It iswidely applied to starch industry and in the manufactu-ring of malt syrup,high-purity glucose,and f…     

丙烯酸在炭黑表面接枝聚合研究

丙烯酸在炭黑表面接枝聚合研究吴壁耀，刘安华，邵兰英，蒋子铎（武汉化工学院精细化工系，武汉，４３００７３）关键词接技聚合，炭黑，Ｚｅｔａ电位，表面改性炭黑是由大量的原生粒子聚集而成的．该聚集体表面积大、表面又含有丰富的极性基因，故在炭黑／涂料树脂体系中...     

On Solutions of BSDE with Two Barriers Under Non-Lipschitz Condition

In this paper,we derive the existence and uniqueness theorem for the adapted solution to backward stochastic differential equations with two barriers under non-Lipschitz condition via penalization method.