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Search Results: 1 - 10 of 359441 matches for " 王艳春 "
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一种二次保形插值参数曲面

计算数学 , 1998,
Abstract:
固定化细胞酿制低度酒饮料

食品科学 , 1994,
Abstract: ?固定化细胞酿制低度酒饮料王春艳常德高等专科学校415000固定化细胞技术开始于70年代,到80年代中后期,研究与应用越来越广泛。在美国、欧洲、日本等发达国家和地区运用此项技术于多项产品的工业化生产,取得巨大的经济效益。各国竞相开发,其实际应用程度已超...
淀粉在DMSO/水溶剂体系中的形态结构及相变研究

- , 2016, DOI: 10.13982/j.mfst.1673-9078.2016.6.016
Abstract: 通过热台偏光显微镜、差示扫描热量仪(DSC)、布拉班德粘度仪、扫描电子显微镜(SEM)、X-射线衍射仪(XRD),系统研究了不同比例的二甲基亚砜(DMSO)/水混合液体系(质量比:0/100, 50/50, 80/20, 100/0)对蜡质玉米淀粉的形态、结晶结构及相变变化(溶解和糊化)的影响。结果表明:随着DMSO浓度的增加,淀粉的颗粒形态和结晶结构破坏程度逐渐增大,经纯DMSO溶液处理后的淀粉,其颗粒呈不规则块状形态及无序结构,无偏光十字存在,可直接溶解在水溶液中。同时淀粉的糊化温度呈现先升高后降低的趋势:当混合液体系中DMSO/水的比例为50/50时,淀粉糊化温度最高(温度区间为76.44 ℃~91.37 ℃);吸热峰强度逐渐减弱,焓值?H逐渐减小,在纯DMSO溶液中,无明显的相变峰出现。淀粉糊在DMSO混合溶液中的峰值粘度均高于水中的峰值粘度,DMSO/水比例为80/20时达到最大值。
The effect of dimethyl sulfoxide (DMSO)/water mixtures at various ratios (weight ratio: 0/100, 50/50, 80/20, and 100/0) on the morphology and phase-transition (dissolution and gelatinization) of waxy corn starch was systematically studied using a polarized microscope with a hot stage, a differential scanning calorimeter (DSC), a Brabender Viscograph, a scanning electron microscope (SEM), and an X-ray diffractometer (XRD). As DMSO concentration increased, the extent of damage in morphology and crystalline structure of starch granules also increased. After treatment with pure DMSO, the granules showed an irregular shape and a disordered structure with an absence of polarization cross, and they could be dissolved in water. Moreover, gelatinization temperatures showed a downward trend after the initial increase. When the ratio of DMSO/water was 50/50, the highest gelatinization temperature was obtained (range: 76.44 ℃~91.37 ℃); then, the endothermic peak intensity and the enthalpy ?H value gradually decreased. In pure DMSO, no apparent phase transition peak occurred. The peak viscosity of starch pastes in DMSO was higher than that in water, and the maximum viscosity was reached when the ratio of DMSO/water was 80:20.
介孔分子筛SBA-15固定化脂肪酶性质的研究
Immobilization of Lipase on Mesoporous SBA-15 and Its Characterization
 [PDF]

, 晓博, 刘加乐,
Hans Journal of Nanotechnology (NAT) , 2011, DOI: 10.12677/nat.2011.11006
Abstract:
本文以介孔分子筛SBA-15为载体采用吸附法对假单胞菌脂肪酶进行了固定化,研究了固定化条件对酶的活性及酶活回收率的影响,得到了最佳固定化条件。并对固定化酶的稳定性(pH、操作稳定性以及储藏稳定性)做了初步研究。结果表明:当载体为1 g,给酶量为50 mg,固定化时间为3 h,溶液的pH值为8.0时,假单胞菌脂肪酶的固定化效果最好,此时酶活力回收率达到60%左右。固定化酶的稳定性较游离酶有很大提高。研究结果表明介孔材料SBA-15是脂肪酶进行固定化的一个优良载体。
Lipase was immobilized on the mesoporous molecular sieve SBA-15 by physical adsorption method. The effects of immobilization conditions on the relative activity and the activity yield of the immobilized lipase were studied. At the same time the pH, operational and storage stability of the immobilized lipase was discussed. The results showed that the optimum conditions for immobilization were as follows: the mass of the carrier, the mass of the free enzyme, time and pH were 1 g. 50 mg, 3.0 h and 8.0, respectively. Under the optimum condition, the activity yield of the immobilized lipase was around 60%. The immobilized lipase showed a good stability compared with the free enzyme. The results showed that the mesoporous molecular sieve SBA-15 is an excellent carrier for the immobilization of lipase.
白藜芦醇通过抑制凋亡对衰老小鼠心肌缺血易损性的影响 Effects of resveratrol on myocardial ischemia vulnerability by apoptosis suppression in aged mice
吴冰,,
- , 2017,
Abstract: 目的通过研究衰老心肌组织凋亡蛋白Bax、抗凋亡蛋白Bcl-2表达,探讨白藜芦醇对衰老心肌缺血易损性的影响及作用机制。方法 C57小鼠分为4月龄组、22月龄组、22月龄加白藜芦醇处理组。用比色法检测沉默调节蛋白1(SIRT1)及Caspase 3活性,蛋白免疫印迹法检测心肌组织Bax、Bcl-2表达,心脏离体再灌注实验检测小鼠的心率血压乘积。结果与4月龄小鼠相比,22月龄小鼠心肌组织SIRT1活性、Bcl-2表达及再灌注后的心率血压乘积显著降低,Caspase 3活性及Bax表达显著升高(P<0.05);给予白藜芦醇处理能提高22月龄小鼠SIRT1活性、Bcl-2表达及再灌注后的心率血压乘积,并降低Caspase 3活性及Bax表达(P<0.05)。结论白藜芦醇可能通过抑制细胞凋亡减轻衰老C57小鼠的心肌缺血易损性
MPP系统中自适应路由算法的分类及分析
刘燕,
计算机科学 , 1998,
Abstract:
人才与产业耦合:创新驱动下西部人才培养路径
陶卓,
科技进步与对策 , 2015, DOI: 10.6049/kjjbydc.201511X118
Abstract: 人才培养需要经过学校教育和在职培训两个阶段。创新驱动发展战略实施后,西部地区人才需求量逐年上升,人才的产业分布也逐步优化。首先,预测了创新驱动下西部地区2020年人才需求总量及人才的产业分布。然后,提出了创新驱动下西部地区学校教育、在职培训发展路径和产业人才培养路径。最后,提出了西部地区人才培养的对策建议,以期使西部地区人才与产业达到最优耦合状态。人才产业耦合创新驱动西部人才培养路径
面向协同创新的产学研知识转移研究现状及展望
,
科技进步与对策 , 2014, DOI: 10.6049/kjjbydc.2014020483
Abstract: 查阅大量国内外相关研究文献,从产学研知识转移的含义、过程、渠道、模式、影响因素、绩效评价、产学研知识转移与协同创新的关系等方面展开综述,总结了协同创新环境下产学研知识转移的研究现状,分析该领域研究中存在的不足,并提出未来重点研究方向。协同创新产学研知识转移产学研知识转移
2011-07读者之声
颢彭
科技导报 , 2011,
Abstract:
左旋门冬酰胺酶在儿童急性淋巴细胞白血病临床应用的安全性分析
,陶蕾
药物评价研究 , 2012,
Abstract: 左旋门冬酰胺酶(L-ASP)作为儿童急性淋巴细胞白血病治疗联合化疗方案中的最基本药物之一,在对维持患儿长期处于带病生存状态中起着极为重要的作用。但长期以来其在儿童临床应用的安全性也一直是人们关注的重点。就近些年L-ASP在国内外儿童临床应用引起不良反应的类型、原因以及发展方向等方面的研究进展进行综述。
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