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Sensitive analysis of amino acids in injection liquor by reversed-phase hPLC

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chinese Journal of chemistry 1995年第2期13卷 163-168页

作者： ShANG, Zh YU, YN GUO, W JIANG, h ZhOU, lm chINESE ACAD SCI DALIAN INST CHEM PHYSDALIAN 116012PEOPLES R CHINA

A convenient derivatization method of amino acids with 1-fluoro-2,4-dinitrobezene as reaction reagent and a separation system were described. The derivative amino acids were separated on a specific chemically bonded phase column with a simple linear gradient elution consisting of aqueous buffer and methanol. The eluate was detected by common ultraviolet absorption detector at 360 nm. The detection limits of amino acids were as low as 10 picomole. This method has been successfully applied to assay amino acid injection liquor used in hospital. It has good reproducibility and precision. The procedures avoid the requirements of particular derivative equipment and analyzer employed in conventional amino acid analysis.

关键词： AMINO ACIDS PRECOLUMN DERIVATIZATION REVERSED PhASE SEPARATION UV ABSORPTION DETERMINATION

Study and Application of Polarographic Catalytic Wave of chlordiazepoxide in the Presence of Persulfate

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chinese Journal of chemistry 2002年第5期20卷 502-508页

作者： Guo, W Lin, h Liu, lm Guo, ZA Song, JF NW Univ Xian Dept Chem Xian 710069 Peoples R China Yuxi Normal Coll Dept Chem Yunnan 653100 Peoples R China

Polarographic catalytic wave of chlordiazepoxide in the presence of K 2S 2O 8 was studied in aqueous and DMF/h 2O mixed solutions. The results showed that a single reduction wave in alkaline medium was the reduction of the N=C bond in 1,2 position of chlordiazepoxide via an intermediate free radical in two one electron successive additions. When K 2S 2O 8 was present, the free radical of the N=C bond was oxidized to regenerate the original, producing a parallel catalytic wave of chlordiazepoxide. It was determined that the apparent rate constant k f of the oxidation reaction was 3.2×10 3 mol -1 ·L·s -1 . Using the catalytic wave the trace of chlordiazepoxide can be determined by linear potential scan polarography. In Nh 3/Nh 4Cl (ph 10.2±0.1, 0.12 mol/L)/K 2S 2O 8 (0.016 mol/L) supporting electrolyte, the second order derivative peak current of the catalytic wave was rectilinear to chlordiazepoxide concentration in the range of 3.20×10 -8 -1.60×10 -7 , 1.60×10 -7 -1.44×10 -6 and 1.44 ×10 -6 -1.44×10 -5 mol/L, respectively. The limit of detection was 9.0×10 -9 mol/L.

关键词： chlordiazepoxide persulfate polarographic catalytic wave free radical

Densification of the Tungsten heavy Alloys at 1473 K and Fabrication of W-Mo System FGM with Density Gradient

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Journal of Materials Science & Technology 1999年第3期15卷 229-232页

作者： Xiong, hP Zhang, lm Li, JG Yuan, RZ Wuhan Univ Technol State Key Lab Adv Technol Mat Synthesis & Proc Wuhan 430070 Peoples R China

The tungsten heavy alloys with hi-Al and Fe-Al additives were sintered by hot-press method at 1473 K for 1 h. It was found that the relative density of the W-Fe alloy could be increased evidently by addition of Al. however, the relative density of W-Ni-Al alloy with low content of Al was conversely decreased considerably compared with that of W-Ni alloy. The causes have been studied. The sintering experiments of Mo alloy and W-Mo alloys with 3 wt pet Fe-1.5 wt pet Al additives were also carried out under the same sintering condition of low temperature. Finally, W-Mo system FGM with density gradient was successfully fabricated. Its density changed gradually from 17.0x10(3) kg/m(3) to 9.5x10(3) kg/m(3) within the middle 1.1 mm thickness range.

关键词： Tungsten alloys

STUDY　ON　FINITE　ELEMENT　METhOD　APPLIED　TO　hARTREE－FOCK－SLATER　CALCULATIONS　FOR　LINEAR　MOLECULES

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chinese chemical Letters 1995年第5期6卷 407-410页

作者： chen, FW chen, ZD Li, lm Liu, ZP Liang, ZX Beijing Univ Dept Chem Beijing 100871 Peoples R China State Key Lab Struct chem Fuzhou 35002 Fujian Peoples R China chinese Acad Sci Computat Ctr Beijing 100870 Peoples R China

In efficient finite element method with a new type of trial function applied to hartree-Fock-Slater calculations for molecular system is presented. The advantage of using new trial functions is that they are able to describe the cusplike behavior of molecular orbitals near location of atomic nuclei. The results calculated on the h2+ and h2systems show that our approach is more practical and efficient than the traditional finite element method.

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Methionine sources and genotype affect embryonic intestinal development,antioxidants,tight junctions,and growth-related gene expression in chickens

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Animal Nutrition 2024年第1期16卷 218-230页

作者： James K.Lugata Sawadi F.Ndunguru Gebrehaweria K.Reda Xénia E.Ozsváth Eszter Angyal Levente Czeglédi Gabriella Gulyás Renáta Knop János Oláh Zoltán Mészár Rita Varga Brigitta Csernus Csaba Szabó Department of Animal Nutrition and Physiology Faculty of Agriculture and Food Sciences and Environmental ManagementUniversity of DebrecenDebrecenHungary Department of Animal husbandry Faculty of Agriculture and Food Sciences and Environmental ManagementUniversity of DebrecenDebrecenHungary Faculty of Agriculture and Food Sciences and Environmental Management Doctoral School of Animal ScienceUniversity of DebrecenDebrecenHungary Institutes for Agricultural Research and Educational Farm University of DebrecenDebrecenHungary Department of Anatomy Histology and EmbryologyFaculty of MedicineUniversity of DebrecenDebrecenHungary Department of Evolutionary Zoology and human Biology Faculty of Science and TechnologyUniversity of DebrecenDebrecenHungary

Methionine(Met)is an essential and first limiting amino acid in the poultry diet that plays a significant role in chicken embryonic development and *** present study examined the effect of in ovo injection of DL-Met and L-Met sources and genotypes on chicken embryonic-intestinal development and *** eggs of the two genotypes,TETRA-SL layer hybrid(TSL)—commercial layer hybrid and hungarian Partridge colored hen breed(hPC)—a native genotype,were randomly distributed into four treatments for each *** treatment groups include the following:1)control non-injected eggs(NoIn);2)saline-injected(SaIn);3)DL-Met injected(Dlm);and 4)L-Met injected(lm).The in ovo injection was carried out on 17.5 d of embryonic development;after hatching,eight chicks per group were sacrificed,and the jejunum was extracted for *** results showed that both Dlm and lm groups had enhanced intestinal development as evidenced by increased villus width,villus height,and villus area(Phe *** Dlm group had significantly reduced crypt depth,glutathione(GSh)content,glutathione S-transferase 3 alpha(GST3),occludin(OCLN)gene expression and increased villus height to crypt depth ratio in the TSL genotype than the lm group(Phe hPC genotype has overexpressed insulin-like growth factor 1(IGF1)gene,tricellulin(MD2),occludin(OCLN),superoxide dismutase 1(SOD1),and GST3 genes than the TSL genotype(Phese findings showed that in ovo injection of Met enhanced intestinal development,and function,with genotypes responding differently under normal *** also influenced the expression of intestinal antioxidants,tight junction,and growth-related genes.

关键词： DL-Methionine L-Methionine In ovo injection Intestinal development Poultry

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Effect of Combined anti-Inflammatory and Nutritional Supplements on Recovery from Resistance Exercise

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Journal of Sports Science 2017年第5期5卷 242-249页

作者： Baggett SA Cosio-Lima lm Knapik JJ Bishop PA Lee Y Department of Exercise Science and Community health. University of West Florida Pensacola FL 32514 USA Tactical Research Unit Bond University Faculty of Health Sciences & Medicine Robina Queensland 4226 Australia Liberty University Lynchburg VA 24515 USA

This study examined the effects of combined anti-inflammatories and specific nutrients on recovery from resistance exercises. Trained individuals （n = 14） performed three sets to failure at a 8-12 repetition maximum load for six resistance exercises, then repeated this workout after 24 h. Participants consumed a protein-carbohydrate shake （330 ml; 20 g protein; 45 g carbohydrate）, vitamin C （1000 mg）, vitamin E （400 I.U.） and ibuprofen （100 mg） immediately after the initial workout. Another dose of vitamin C and ibuprofen were respectively consumed 1 h or 30 min before the second workout. On another occasion （counterbalanced） a placebo of flavored water, two imitation vitamins （gummy candies）, and two replica ibuprofen （sugar pills） were consumed. A 10-cm visual analog scale （VAS） assessed pain, ratings of perceived exertion （RPE）, and ratings of perceived recovery （RPR）. Treatment enhanced performance-based recovery （repetitions after 24h） for the chest press （P 〈 0.010） and latissimus pull-down （P 〈 0.010）. Within-condition comparisons revealed performance decrements （P 〈 0.050） after 24 h for 83% of the exercises under placebo, compared to 50% of exercises under treatment. Treatment enhanced RPR （P = 0.038） compared to placebo, but had no significant effects on residual （P = 0.215） or exercise （P 〉 0.050） pain. RPE was lower under the treatment for the chest press （P = 0.016） and overall workout （P = 0.038） on Day 1, but similar among all exercises on Day 2 （P 〉 0.050）. This treatment may promote increases in performance without increasing pain or RPE.

关键词： Anti-oxidants vitamins Non-steroidal anti-inflammatory medication weightlifling perceived exertion.

膝关节后外侧不稳导致前交叉韧带重建失败的组织学因素

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中国组织工程研究与临床康复 2007年第21期11卷 4085-4088页

作者：黄河王黎明桂鉴超宋华荣南京市第一医院骨科江苏省南京市210006

目的:分析膝关节后外侧失稳导致前交叉韧带重建失败原因中的组织学因素。方法:选择2004-06/2006-03南京医科大学附属南京第一医院骨科接收的9例患者,均为膝关节后外侧角合并前交叉韧带损伤,且于伤后只接受了前交叉韧带的重建,仍以关节... 详细信息

目的:分析膝关节后外侧失稳导致前交叉韧带重建失败原因中的组织学因素。方法:选择2004-06/2006-03南京医科大学附属南京第一医院骨科接收的9例患者,均为膝关节后外侧角合并前交叉韧带损伤,且于伤后只接受了前交叉韧带的重建,仍以关节不稳就诊。实验过程:关节镜下见前交叉韧带移植物异常松弛,遂予以二次重建,同时解剖重建后外侧结构,术中取下失效之前交叉韧带移植物予光镜下观察,并与重建成功的韧带进行比较。实验评估:经过平均11个月的随访,根据膝关节内翻应力试验及Cooper试验评估膝关节的稳定性,根据膝关节Lysh.lm评分标准及IKDC膝关节评分标准评估膝关节的功能。结果:9例患者均进入结果分析。①光镜下结果:可见重建失败的前交叉韧带移植物中胶原细胞稀少甚至组织水肿,血管长入少,显示细胞繁殖及再血管化失败,而重建成功的组织胶原细胞丰富,血管长入多,显示细胞繁殖及再血管化的进程顺利。②患者关节稳定性结果:行内翻应力试验时,发现屈膝0°及30°位时与健侧相比均未见内侧不稳的现象;Cooper试验则显示,30°位外旋不稳者2例,均在5°以下,90°位与健侧相比无明显异常。关节活动度,屈曲75°～120°,平均为102°,伸0°～5°,平均1°。③膝关节Lysh.lm评分结果,术后评分为52～92分,平均81.6分;按照IKDC膝关节评分标准,客观评价正常的2例,近似正常的5例,不正常的2例,严重异常的无,主观评价41～92分,平均为80分。结论:忽视对膝关节其他结构的损伤,特别是后外侧角的修复重建,是导致前交叉韧带重建术失败的主要原因。

关键词：膝关节后外侧角前交叉韧带重建

使用以问题为基础的学习方法提高新护士的批判性思维能力

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国外医学（护理学分册） 2001年第9期20卷 436-437页

作者： Celia lm 肖灿华

为帮助新护士提高处理复杂临床问题的能力，促进其批判性思维的养成，顺利进入急诊病房进行工作，费城一所医院在继续教育中提出了一个以学生为中心、以问题为基础的小组学习方法。“以问题为基础”是指选择一系列现实问题进行模拟处理... 详细信息

为帮助新护士提高处理复杂临床问题的能力，促进其批判性思维的养成，顺利进入急诊病房进行工作，费城一所医院在继续教育中提出了一个以学生为中心、以问题为基础的小组学习方法。“以问题为基础”是指选择一系列现实问题进行模拟处理，学员不用课前准备，利用他们学过的知识去解释、分析问题，提出处置设想，从而积累新的知识。“以学生为中心”是指学生自己决定自己的学习需求；以５～７人为一小组，相互支持，相互学习。方法参加者均为女性，年龄在２５岁左右，急诊临床工作不到一年，大多数在不久前已取得护理学士学位，第一批参加者人数为１４人，分为两个学习小组。课程分为两个阶段：第一阶段为期６Ｗ，每隔一天集中学习一次，在这一天中，有３～４ｈ用来研究学习中出现的各种问题，其余时间则用来进行“以问题为基础的学习”讨论，由指导老师负责；第二阶段为期３个月，参加者主要在固定的临床科室进行实践学习，科室护士长与临床护理专家对其实践负责。“以问题为基础的学习”也贯穿于该过程，参加者每周有２～３个连续的工作日集中学习。“以问题为基础的学习”程序如下：指导老师设计１３个病例，这些病例为护士在临床工作中可能碰到的各种急、慢性病例，如肾衰、慢性肺心病、骨折或多种...

关键词：护士继续教育学习方法批判性思维能力护理

COMPOSITION EFFECT ON DRY SLIDING WEAR BEhAVIORS OF Ti-B-N ThIN FIlmS

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 300-306页

作者： P.Sit Y.h.Lu h.chen Z.F.Zhou Y.G.Shen K.Y.Li DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina DepartmentofPhysicsandMaterialsScience CityUniversityofHongKongKowloonHongKongChina／／DepartmentofManufacturingEngineeringg：EngineeringManagementCityUniversityofHongKongKowloonHongKongChina DepartmentofManufacturingEngineering＆EngineeringManagement CityUniversityofHongKongKowloonHongKongChina

Friction and sliding wear behaviour of Ti-B-N coatings against AISI440C steel ba ll and WC-6wt%Co ball were studied by using pin-on-disk tribometer along with mi crostructure characterization using optical microscopy (OM), scanning electron m icroscopy (SEM) and X-ray photoelectron spectroscopy (XPS). It is shown that the wear resistance of film depended on the wear mechanism. In the case of AISI440C steel, adhesive wear were pre-dominant and the wear rate increased sharply to a maximum when N content reach ~38at.%. This might be related to the change of fi lm microstructure and phase configuration, so the least adhesive transfer of tri bo-film was observed. If WC-6wt%Co ball was used, less deformation wear debris w as observed, this was responsible for the rise of wear rate. Despite of differen t wear modes, friction coefficients in both cases were found to depend mainly on the formation and the amount of h-BN phase. Elemental analysis by energy disper sive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) revealed that oxygen participated in the wear behavior by reacting with films to form the deb ris comprised of various types of Ti oxide including TiO, TiO2 and Ti2O3 , which increased wear resistance.

关键词： dry sliding wear friction coefficient oxidation Ti-B-N wear