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Effect of Zinc Acetate on Broiler Nutrient Metabolism and Skeleton Characteristic
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作者 Liu Da-wei Cao Shu-xin +4 位作者 Wei Jing-kun Qin Wen-chao Liu Yang Li Jia-ning Xu Liang-mei 《Journal of Northeast Agricultural University(English Edition)》 CAS 2020年第1期60-68,共9页
The aim of this study was to determine the effects of supplementing organic forms of zinc(zinc acetate,ZnA)and inorganic zinc(zinc sulfate,Zn S)on performance,the gain to feed ratio(G:F)and skeletal characters in broi... The aim of this study was to determine the effects of supplementing organic forms of zinc(zinc acetate,ZnA)and inorganic zinc(zinc sulfate,Zn S)on performance,the gain to feed ratio(G:F)and skeletal characters in broilers from the first day to the 42th day.A total of 240-day-old broilers(Arbor Acres)were randomly distributed in four groups.A corn-soybean meal-based control diet containing recommended concentrations of inorganic trace minerals and other nutrients was prepared.On the basal diets,the control goup(CG)was supplemented with Zn S and the treatment group(TG)feeding diets were with different ZnA supplemental levels(80,100 and 150 mg·kg^-1)of ZnA.Each group was allotted randomly to five replicates and 12 broilers in each replicate and fed ad libitum from the first day to the 42th day.The results showed that supplementation of ZnA significantly increased(p<0.05)energy and phosphorus(P)compared to that fed Zn S on the 21th day.Calcium(Ca),tibia weight,ash weight,tibia Ca and tibia P in TG(80 mg·kg^-1 of ZnA)were the highest(p<0.05).The pancreas Zn content of TG was higher than that in CG and increased with the supplementation of ZnA.On the 42th day,the content of energy,crude protein(CP),Ca and tibia Ca in TG(80 mg·kg^-1 of ZnA)were the highest(p<0.05),the change of pancreas Zn was the same as the results on the 21th day,but enter extract(EE),tibia weight,tibia length,tibia width and ash weight were not affected(p>0.05)by ZnA.The results of this study showed that ZnA was better than Zn S in improving the early growth performance,nutrient utilization rate in broilers,the length and weight of broiler tibia,it promoted the calcium,phosphorus deposition and normal growth of tibia,and the optimum dietary ZnA level to feed was 80 mg·kg^-1.ZnA affected body Zn stores and the apparent metabolic rate of nutrients. 展开更多
关键词 BROILER zinc acetate NUTRIENT metabolism SKELETAL TRAIT
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Poly(Acrylamide-Co-Acrylic Acid)-Zinc Acetate Polymer Electrolytes: Studies Based on Structural and Morphology and Electrical Spectroscopy
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作者 Mohd Faiz Hassan Siti Zulaikha Mohd Yusof 《Microscopy Research》 2014年第2期30-38,共9页
Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorp... Solid polymer electrolytes (SPEs) of polyacrylamide-co-acrylic acid (PAA) as the polymer host and zinc acetate (ZnA) as an ionic dopant were prepared using a single solvent by the solution casting technique. The amorphous and crystalline structures of film were investigated by X-ray diffraction (XRD). The surface morphology of samples was examined by scanning electron microscopy (SEM). The composition and complex formation of films were characterized by Fourier transform infrared (FTIR) spectroscopy. The conductivity of the PAA-ZnA films was determined by electrochemical impedance spectroscopy. According to the XRD and FTIR analyses, all electrolyte films were in amorphous state and the existence of interaction between Zn2+ cations and the PAA structure confirms that the film was successfully prepared. The SEM observations reveal that the electrolyte films appeared to be rough and flat with irregularly shaped surfaces. The highest ionic conductivity (σ) of 1.82 × 10-5 Scm-1 was achieved at room temperature (303 K) for the sample containing 10 wt % ZnA. 展开更多
关键词 Solution Cast Technique Solid Polymer Electrolyte Poly(Acrylamide-Co-Acrylic Acid) zinc acetate Ionic Conductivity Impedance SPECTROSCOPY Fourier Infrared SPECTROSCOPY Scanning Electron Microscopy
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Reinvestigation of the Crystal Growth of “L-Proline Succinate” and “L-Threonine Zinc Acetate” Showing Use of Infrared Spectra for Product Identification
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作者 Subramanian Natarajan Bikshandarkoil R. Srinivasan Kalimuthu Moovendaran 《Journal of Crystallization Process and Technology》 2014年第2期121-125,共5页
Reinvestigation of the growth of L-proline succinate (1) (Paramasivam and Ramachandra Raja, Journal of Crystallization Process and Technology, 2 (2012) 21 - 24;Balamurugaraj et al., Journal of Material Physics and Che... Reinvestigation of the growth of L-proline succinate (1) (Paramasivam and Ramachandra Raja, Journal of Crystallization Process and Technology, 2 (2012) 21 - 24;Balamurugaraj et al., Journal of Material Physics and Chemistry 1 (2013) 4 - 8) and L-threonine zinc acetate (2) (Puhal Raj and Ramachandra Raja, Photonics and Optoelectronics, 2 (2013) 56 - 64) is reported. Slow evaporation of an aqueous solution containing equimolar quantities of L-proline and succinic acid (for 1) and L-threonine and zinc acetate (for 2) results in the fractional crystallization of succinic acid (in the first case) and L-threonine (in the second case) and not any novel organic non-linear optical (NLO) crystals. In this paper, the usefulness of infrared spectra for correct product characterization is demonstrated. 展开更多
关键词 L-PROLINE SUCCINATE L-THREONINE zinc acetate X-Ray Cell Data IR Spectra Non-Linear Optical Crystals
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Synthesis,Structure,and Surface Photo-electric Properties of a New Zn(Ⅱ)Coordination Complex Constructed from 2-(1H-benzotriazol-1-yl)acetic Acid and 1,10-Phenanthroline Ligands 被引量:2
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作者 李家明 史忠丰 何坤欢 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第1期135-142,共8页
A new binuclear Zn^Ⅱ coordination complex,Zn2(bta)(phen)2(Cl)3(1,Hbta = 2-(1Hbenzotriazol-1-yl)acetic acid and phen = 1,10-phenanthroline),has been synthesized and characterized by single-crystal X-ray diff... A new binuclear Zn^Ⅱ coordination complex,Zn2(bta)(phen)2(Cl)3(1,Hbta = 2-(1Hbenzotriazol-1-yl)acetic acid and phen = 1,10-phenanthroline),has been synthesized and characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental,and photoluminescent analysis.Complex 1 crystallizes in triclinic system,space group P1 with a = 9.3040(19),b = 10.694(2),c =16.841(3) A°,α = 101.18(3),β = 105.77(3),γ = 91.72(3)°,V= 1575.8(5) A°3,C(32)H(22)Zn2Cl3N7O2,Mr =773.66,Dc = 1.631 g/cm^3,Z = 2,F(000) = 780,μ = 1.820 mm^-1,the final R = 0.1238 and wR =0.1131.X-ray diffraction analyses indicate that 1 displays two crystallographic independent Zn^Ⅱmetal centers with a distorted tetragonal pyramidal(ZnN4O) and a tetrahedral(ZnNCl3) geometries,respectively.The phen serves as a common N,N'-bidentate ligand,and the bta^- as a unique N,O-bridged ligand in 1.In the crystal,1 forms a stable 3D supramolecular architecture by trifurcated hydrogen bonding C-H…C1 interactions and C-H…π,π…π stacking.1 showed photo-electric conversion properties. 展开更多
关键词 photo-electric property zinc(Ⅱ) complex 2-(1H-benzotriazol-1-yl)acetic acid synthesis crystal structure
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Zinc and Silver Salts-Containing Lamellar Titanium Phosphate: A Multifunctional Filler
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作者 Enzo Erbisti Garcia Gerson Alberto Valencia Albitres +2 位作者 Daniela França Silva Freitas Danielle Mattos Mariano Luis Cláudio Mendes 《Materials Sciences and Applications》 2022年第6期366-388,共23页
Zinc and silver compounds have been studied because they have ultraviolet light barrier properties and bactericidal action, respectively. Materials with multifunctional characteristics have been sought to produce poly... Zinc and silver compounds have been studied because they have ultraviolet light barrier properties and bactericidal action, respectively. Materials with multifunctional characteristics have been sought to produce polymeric nanocomposites. In this work, the chemical modification of titanium phosphate (TiP) was carried out through a route with successive intercalations. TiP was synthesized and consecutively pre-expanded with ethylamine and pyromellitic acid. Then it was modified with zinc acetate and silver nitrate. The final product was characterized by Fourier transform infrared spectroscopy, differential scanning calorimetry, wide-angle X-ray diffractometry, field emission scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and thermogravimetry. Infrared revealed dislocation and appearance of bands according to the intercalating agent. Inorganic salts interfered in the crystallization and melting processes of pyromellitic acid. Vanishing of the TiP hkl plane and variation and appearance of new crystallographic planes at low diffraction angles induced intercalation. SEM showed agglomerated structures. New thermal degradation events at higher temperatures endorsed the formation of zinc and silver carboxylate salts. We concluded that a new miscellaneous and multifunctional matter was achieved. 展开更多
关键词 Titanium Phosphate INTERCALATION Pyromellitic Acid zinc acetate Silver Nitrate ETHYLAMINE
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PEI功能化乙酸锌辅助机械化学法合成的ZIF-8吸附CO_(2)性能研究
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作者 李安琪 刘民 郭新闻 《化学反应工程与工艺》 CAS 2024年第4期342-350,共9页
为开发高效且适合大规模生产的CO_(2)吸附剂,采用乙酸锌为辅助研磨物,ZnO为金属前驱体,利用机械化学法高效合成高比表面积的ZIF-8材料,考察了机械化学法的合成条件及优势,采用湿浸渍法将聚乙烯亚胺(PEI)负载到ZIF-8材料中,通过X射线衍射... 为开发高效且适合大规模生产的CO_(2)吸附剂,采用乙酸锌为辅助研磨物,ZnO为金属前驱体,利用机械化学法高效合成高比表面积的ZIF-8材料,考察了机械化学法的合成条件及优势,采用湿浸渍法将聚乙烯亚胺(PEI)负载到ZIF-8材料中,通过X射线衍射(XRD)、扫描电镜(SEM)、红外光谱(FT-IR)和N2吸附-脱附等进行表征,评价其CO_(2)吸附性能。结果表明:机械化学法可在短时间内高效合成ZIF-8材料,其收率高达80.7%。机械化学法显著减少了有机溶剂和有机配体的用量,所合成的ZIF-8具有更小的粒径。PEI的加入显著提高了ZIF-8的CO_(2)吸附性能,其中PEI负载量为60%(质量分数)的吸附剂在50℃的吸附量最高,达到90.21 mg/g,较ZIF-8提高约14倍。此外,该复合材料还表现出良好的稳定性和再生性,在CO_(2)吸附领域具有广阔的应用前景。 展开更多
关键词 ZIF-8 乙酸锌辅助 机械化学法 氨基功能化材料 CO_(2)吸附
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贫化水合醋酸锌-64合成研究
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作者 周红艳 陈俭月 +1 位作者 王珂 仝庆 《天津化工》 CAS 2024年第3期34-37,共4页
贫化水合醋酸锌-64作为核电反应堆冷却水回路添加剂,可有效减缓设备腐蚀并降低四周辐射。本研究以贫化二乙基锌-64为原料,通过醇化、酸化、水合结晶等工艺得到高纯度贫化醋酸锌-64产品。系统考察了有机醇种类和用量、酸化合成反应条件... 贫化水合醋酸锌-64作为核电反应堆冷却水回路添加剂,可有效减缓设备腐蚀并降低四周辐射。本研究以贫化二乙基锌-64为原料,通过醇化、酸化、水合结晶等工艺得到高纯度贫化醋酸锌-64产品。系统考察了有机醇种类和用量、酸化合成反应条件、结晶母液密度等因素对产品制备的影响,获得了高收率转化工艺和高纯度的贫化水合醋酸锌-64产品,产品收率最高达到96.7%,产品纯度最高为99.96%。通过X射线衍射、红外光谱、扫描电镜和热重分析等技术对产品进行了充分表征。本文的研究结果应用于贫化水合锌-64同位素产品的批量生产中,该技术也适用于用金属有机盐原料制备无机盐类同位素产品的过程。 展开更多
关键词 贫化二乙基锌-64 醇化 酸化 水合结晶 贫化醋酸锌-64
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山竹壳制备吸附-光催化碳材料及其性能
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作者 陈厶墁 贾赵平 +3 位作者 邱梦杰 李玉成 马梦韶 刘静 《林业工程学报》 CSCD 北大核心 2024年第1期92-100,共9页
以山竹壳为原料,通过磷酸活化处理、焙烧、浸渍乙酸锌、乙酸银溶液的方法制得复合双金属生物质碳材料AgZn/P/BC,并在可见光照射下研究该复合双金属生物质碳材料对2,4-二氯苯酚(2,4-DCP)的吸附-可见光催化协同降解性能。采用扫描电子显微... 以山竹壳为原料,通过磷酸活化处理、焙烧、浸渍乙酸锌、乙酸银溶液的方法制得复合双金属生物质碳材料AgZn/P/BC,并在可见光照射下研究该复合双金属生物质碳材料对2,4-二氯苯酚(2,4-DCP)的吸附-可见光催化协同降解性能。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、紫外-可见漫反射光谱仪(DRS)、比表面积测试仪(BET)和X射线光电子能谱(XPS)对复合材料进行表征分析,采用高效液相色谱法(HPLC)测定反应物浓度,计算脱除率。分别比较不同金属物质的量比(Ag、Zn)和不同金属乙酸盐溶液浸渍浓度的单一反应条件发现,当金属物质的量比n(Ag)∶n(Zn)为1∶1,金属乙酸盐溶液浓度为0.01 mol/L时,复合材料对2,4-DCP的降解效果最好,黑暗环境中吸附30 min脱除率可达62.33%,光照条件下催化120 min脱除率可达93.52%。动力学研究结果表明,金属乙酸盐溶液浓度为0.01 mol/L的复合双金属生物质碳材料AgZn/P/BC,其降解速率相较于金属乙酸盐溶液浓度为0.03 mol/L的AgZn/P/BC提高了近1.76倍,在pH测试和循环实验中复合材料的催化性能均保持良好,表明AgZn/P/BC具有优异的光催化降解2,4-二氯苯酚性能。 展开更多
关键词 山竹壳 2 4-二氯苯酚 生物质碳 乙酸银 乙酸锌 吸附-光催化
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Characteristics of patients with Wilson disease in the United States: An insurance claims database study
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作者 Thomas Daniel-Robin Pradeep Kumar +1 位作者 Bernard Benichou Jean-Philippe Combal 《World Journal of Hepatology》 2024年第5期791-799,共9页
BACKGROUND Wilson disease(WD)is a progressive,potentially fatal degenerative disease affecting the liver and central nervous system.Given its low prevalence,collecting data on large cohorts of patients with WD is chal... BACKGROUND Wilson disease(WD)is a progressive,potentially fatal degenerative disease affecting the liver and central nervous system.Given its low prevalence,collecting data on large cohorts of patients with WD is challenging.Comprehensive insur-ance claims databases provide powerful tools to collect retrospective data on large numbers of patients with rare diseases.AIM To describe patients with WD in the United States,their treatment and clinical outcome,using a large insurance claims database.METHODS This retrospective,longitudinal study was performed in the Clarivate Real-World Data Product database.All patients with≥2 claims associated with an Interna-tional Classification of Diseases 10(ICD-10)diagnostic code for WD(E83.01)between 2016 and 2021 were included and followed until death or study end.Patients were divided into two groups by whether or not they were documented to have received a specific treatment for WD.Clinical manifestations,hospital-isations,liver transplantation and death were documented.RESULTS Overall,5376 patients with an ICD-10 diagnostic code for WD were identified.The mean age at inclusion was 41.2 years and 52.0%were men.A specific WD treatment was documented for 885 patients(15.1%),although the number of patients taking zinc salts may be underestimated due to over the counter purchase.At inclusion,the mean age of patients with a documented treatment was 36.6±17.8 years vs 42.2±19.6 years in those without a documented treatment.During follow-up,273 patients(5.1%)died.Compared with the American general population,the standardised mortality ratio was 2.19.The proportion of patients with a documented WD-specific treatment who died during follow-up was 4.0%and the mean age at death 52.7 years.CONCLUSION Patients treated for WD in the United States had an excess early mortality compared with the American population.These findings indicate that there is a significant unmet need for effective treatment for WD in the United States. 展开更多
关键词 Wilson disease MORTALITY TREATMENT Copper chelators zinc acetate United States
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合成醋酸乙烯催化剂制备条件的研究 被引量:9
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作者 尚会建 李明 +2 位作者 胡国胜 郑学明 王亮 《煤炭转化》 CAS CSCD 北大核心 2010年第2期72-74,共3页
采用过量浸渍法制备乙炔气相法合成醋酸乙烯催化剂醋酸锌/活性炭,对制备条件进行了研究.结果表明,较合适的浸渍条件为醋酸锌浓度0.8mol/L,平衡时间60min,浸渍温度55℃.120℃下干燥30min水分就完全烘干,而90℃下干燥70min催化剂才达到恒... 采用过量浸渍法制备乙炔气相法合成醋酸乙烯催化剂醋酸锌/活性炭,对制备条件进行了研究.结果表明,较合适的浸渍条件为醋酸锌浓度0.8mol/L,平衡时间60min,浸渍温度55℃.120℃下干燥30min水分就完全烘干,而90℃下干燥70min催化剂才达到恒重.由比表面积分析可知,随着干燥温度的升高,中孔被堵塞,催化剂的平均孔半径减小;干燥温度高于110℃后,比表面积和平均孔半径变化不明显.由SEM可以看出,催化剂表面明显存在醋酸锌晶体. 展开更多
关键词 催化剂 醋酸乙烯 乙炔 醋酸锌
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活性炭载体对醋酸乙烯合成催化剂活性的影响 被引量:7
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作者 于政锡 徐建本 +2 位作者 郑起 林性贻 詹瑛瑛 《石油化工》 EI CAS CSCD 北大核心 2006年第12期1140-1144,共5页
选择6种活性炭为载体制备了用于合成醋酸乙烯的负载型醋酸锌催化剂,采用N2吸附、程序升温脱附、元素分析、扫描电子显微镜等表征方法,考察了活性炭载体的比表面积、孔结构、表面含氧官能团、表面形貌及化学组成对负载型醋酸锌催化剂活... 选择6种活性炭为载体制备了用于合成醋酸乙烯的负载型醋酸锌催化剂,采用N2吸附、程序升温脱附、元素分析、扫描电子显微镜等表征方法,考察了活性炭载体的比表面积、孔结构、表面含氧官能团、表面形貌及化学组成对负载型醋酸锌催化剂活性的影响。研究结果发现,相对于墨水瓶孔结构的活性炭,具有平行板孔结构的活性炭更有利于反应物分子和产物分子在催化剂内表面的吸附和脱附,对应的负载型醋酸锌催化剂的活性较高;相同材质的活性炭载体中,比表面积较大、含CO的表面含氧官能团的比例较大、纯度高、灰分含量低的活性炭载体负载的醋酸锌催化剂的活性较高。 展开更多
关键词 活性炭 载体 醋酸锌 催化剂 醋酸乙烯
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光屏蔽剂对聚甲醛耐老化性能的影响 被引量:15
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作者 任显诚 赵红军 +2 位作者 蔡绪福 陈山玉 淡宜 《中国塑料》 CAS CSCD 北大核心 2005年第4期78-81,共4页
采用炭黑和纳米级氧化锌两种光屏蔽剂对共聚甲醛进行耐老化改性,对比了改性前后聚甲醛耐紫外光、耐热氧及耐热水老化性能的变化。结果表明,紫外光老化对聚甲醛性能影响最显著,两种光屏蔽剂均能减缓聚甲醛的光降解过程。炭黑的光屏蔽效... 采用炭黑和纳米级氧化锌两种光屏蔽剂对共聚甲醛进行耐老化改性,对比了改性前后聚甲醛耐紫外光、耐热氧及耐热水老化性能的变化。结果表明,紫外光老化对聚甲醛性能影响最显著,两种光屏蔽剂均能减缓聚甲醛的光降解过程。炭黑的光屏蔽效果优于氧化锌,但会加速聚甲醛热氧降解。聚甲醛试样表面层相对分子质量的变化规律基本上与试样断裂伸长率、冲击强度以及色差变化规律保持一致。 展开更多
关键词 氧化锌 炭黑 聚甲醛 耐老化性能
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醋酸锌/炭小球催化剂的制备及其催化合成醋酸乙烯性能 被引量:9
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作者 蒋永州 何林 +1 位作者 王绪根 代斌 《化学工程》 CAS CSCD 北大核心 2012年第7期69-73,共5页
以炭小球(SAC)为载体,采用过量浸渍法制备了不同醋酸锌负载量的醋酸锌/炭小球催化剂,在常压固定床反应器上,考察了醋酸锌负载量、反应温度、乙炔和醋酸摩尔比、空速等因素对乙炔合成醋酸乙烯的影响。采用SEM,BET,XRD等表征手段研究了催... 以炭小球(SAC)为载体,采用过量浸渍法制备了不同醋酸锌负载量的醋酸锌/炭小球催化剂,在常压固定床反应器上,考察了醋酸锌负载量、反应温度、乙炔和醋酸摩尔比、空速等因素对乙炔合成醋酸乙烯的影响。采用SEM,BET,XRD等表征手段研究了催化剂活性降低的机理。研究表明,活性组分的流失和反应过程中形成的少量积炭是催化剂活性下降的2个重要原因。当催化剂中醋酸锌负载量(质量分数)为32.05%,常压,反应温度220℃,C2H2/HAc摩尔比为3∶1,乙炔体积空速为500 h-1,反应110 h后,醋酸的单程转化率为24.20%,醋酸乙烯选择性为98.50%,醋酸锌/炭小球催化剂催化合成醋酸乙烯的生产能力可达2.95 g/(mL.d),比高比表面活性炭催化剂的生产能力高35.32%,且该催化剂具有良好的催化活性、醋酸乙烯选择性和反应稳定性。 展开更多
关键词 炭小球 乙炔 醋酸锌 醋酸乙烯 生产能力
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国内乙炔气相法制备醋酸乙烯催化剂的研究进展 被引量:7
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作者 李明 尚会建 +1 位作者 胡国胜 郑学明 《河北工业科技》 CAS 2009年第5期395-396,399,共3页
醋酸乙烯是世界上产量非常大的50种有机化工原料之一。从活性组分、载体、助催化剂及失活原因4个方面综述了国内乙炔气相法合成醋酸乙烯催化剂的研究进展,并结合前人研究结果和目前发展趋势,对其未来研究方向进行了展望。
关键词 醋酸乙烯 乙炔 催化剂 醋酸锌 活性炭
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直接沉淀法制备纳米氧化锌工艺研究 被引量:15
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作者 王振希 郑典模 +3 位作者 李建敏 范敏 刘明 庄叶凯 《无机盐工业》 CAS 北大核心 2006年第9期40-42,共3页
提供一种以醋酸锌与碳酸氢铵为原料,添加表面活性剂,直接沉淀法制备纳米氧化锌的新工艺。讨论了反应物浓度和配比、反应温度、反应时间、前驱物碱式碳酸锌热分解温度对纳米氧化锌形成的影响。采用透射电镜(TEM)、X射线衍射(XRD)... 提供一种以醋酸锌与碳酸氢铵为原料,添加表面活性剂,直接沉淀法制备纳米氧化锌的新工艺。讨论了反应物浓度和配比、反应温度、反应时间、前驱物碱式碳酸锌热分解温度对纳米氧化锌形成的影响。采用透射电镜(TEM)、X射线衍射(XRD)、热重/差热分析(TG/DTA)等方法对制备的纳米氧化锌进行表征,结果为:制得的氧化锌的平均粒径在20—80nm,晶型为六方晶系。 展开更多
关键词 纳米氧化锌 醋酸锌 直接沉淀法
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不同因子对长春花愈伤组织中药用成分积累的影响 被引量:19
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作者 张向飞 张荣涛 +3 位作者 曹岚 王勇 王宁宁 王淑芳 《中国药学杂志》 EI CAS CSCD 北大核心 2004年第11期817-819,共3页
目的 研究继代次数、继代龄(继代组织块的年龄)、生长素、金属离子等因子的改变对长春花愈伤组织生长及吲哚生物碱类药用成分积累的影响。方法 测定不同因子的影响下,长春花愈伤组织的鲜重,并对吲哚总碱进行提取、含量测定和比较。结果... 目的 研究继代次数、继代龄(继代组织块的年龄)、生长素、金属离子等因子的改变对长春花愈伤组织生长及吲哚生物碱类药用成分积累的影响。方法 测定不同因子的影响下,长春花愈伤组织的鲜重,并对吲哚总碱进行提取、含量测定和比较。结果 随继代次数的增加,长春花愈伤组织中吲哚总碱含量有所下降;20 d继代龄最利于组织生长;2,4-二氯苯氧乙酸的存在对吲哚总碱的积累有一定的抑制作用,但却有利于愈伤组织生长,两种生长素组合比单一的生长素更利于组织生长,也较利于吲哚总碱积累;钙离子浓度为220 mg·L-1,锌离子浓度为8.6哗·L-1时,对提高吲哚总碱产量最有效。结论 继代次数、继代龄、生长素、金属离子对长春花愈伤组织生长及吲哚生物碱类药用成分的积累有较大影响。 展开更多
关键词 长春花 愈伤组织 吲哚总碱
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乙炔法合成醋酸乙烯催化剂的研究进展 被引量:22
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作者 陈晨 林性贻 +1 位作者 陈晓晖 郑起 《工业催化》 CAS 2003年第11期7-12,共6页
从催化剂载体、活性组分、反应机理三个方面回顾了国内外乙炔法合成醋酸乙烯催化剂的研究进展,并对今后的发展方向进行了展望。
关键词 醋酸乙烯 乙炔 催化剂 醋酸锌
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室温无溶剂条件下醋酸锌催化的Knoevenagel缩合反应 被引量:23
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作者 刘雄伟 姜恒 宫红 《有机化学》 SCIE CAS CSCD 北大核心 2007年第1期131-133,共3页
以醋酸锌作为催化剂,在室温无溶剂条件下催化芳香醛与活泼亚甲基化合物发生Knoevenagel缩合反应,其反应条件温和,产率最高可达100%,产品纯度好,操作和后处理简单.
关键词 醋酸锌:Knoevenagel缩合反应 催化
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纳米氧化锌的均匀沉淀法制备工艺研究 被引量:8
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作者 刘琳 田静博 +2 位作者 邢锦娟 秦金兰 钱建华 《粉末冶金工业》 CAS 北大核心 2008年第6期10-13,共4页
介绍了以醋酸锌与尿素为原料,添加表面活性剂,均匀沉淀法制备纳米氧化锌的新工艺。讨论了反应物浓度的配比、反应浓度、反应时间、表面活性剂对纳米氧化锌形成的影响。采用X射线衍射(XRD)、激光粒度分析仪、热分析、扫描电镜等方法对制... 介绍了以醋酸锌与尿素为原料,添加表面活性剂,均匀沉淀法制备纳米氧化锌的新工艺。讨论了反应物浓度的配比、反应浓度、反应时间、表面活性剂对纳米氧化锌形成的影响。采用X射线衍射(XRD)、激光粒度分析仪、热分析、扫描电镜等方法对制备纳米氧化锌进行表征,结果表明:制得的氧化锌的平均粒径为52 nm,晶型为六方晶系。 展开更多
关键词 纳米氧化锌 醋酸锌 均匀沉淀法
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醋酸锌与三种氨基酸配合行为的相化学研究 被引量:6
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作者 杨祖培 方秋霞 +2 位作者 侯育冬 王小芳 高胜利 《陕西师范大学学报(自然科学版)》 CAS CSCD 北大核心 1999年第4期69-72,共4页
用半微量相平衡法研究了ZnOAc2-His/Met/Phe-H2O在25℃及全浓度范围内的溶度性质,构置了体系的溶度图.在相图指导下,合成了Zn(His)OAc2·1/2H2O配合物,用IR和XPS法表征了其结构.
关键词 醋酸锌 氨基酸 相化学 配合物 半微量相平衡法
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