改进血型实验方法,培养学生综合能力     

彭晓云  王焰山 《实验室研究与探索》2006,25(8):896-898

改进血型定性实验为综合性实验,试制血型诊断抗体和诊断红细胞悬液,满足中学生血型实验试剂需求。自正常A、B型血样分离血清或红细胞,玻片法定性倍比稀释定量检测抗A、抗B,滤菌后冷藏;生理盐水洗涤红细胞,离心沉淀,冷藏。用自制诊断抗体和诊断红细胞悬液与标准试剂对比检测样本60例。自制诊断抗体与诊断红细胞悬液的诊断结果与标准试剂无显著性差异。大学生自制诊断抗体与诊断红细胞悬液基本达到生物制品诊断试剂的标准,大大降低学校用血型试剂成本,也有利于培养大学生综合技能。  相似文献   

除虫菊细胞悬浮培养3种方法的比较     

李小六  田立民  陈超  杨松元 《衡水学院学报》2005,7(1):18-20

利用克氏瓶法、琼脂增稠法、纱布球法3种方法研究除虫菊细胞生长速率的变化。比较3种方法得出克氏瓶法悬浮培养细胞的生长速率最快,达0. 083g干重/(L·d),第12d为最佳收获时期,最大收获量为0. 996g干重/L。  相似文献   

液固两相槽道流中柱状粒子取向的数值研究   总被引：1，自引：0，他引：1  

周强  林建忠  王叶龙 《科技通报》2004,20(5):375-380

对柱状粒子在槽道流场内的运动进行数值模拟，然后用统计方法得出大量柱状粒子的取向分布；给出了粒子长径比、粒子密度和流场区域对粒子取向分布的影响．计算结果表明，柱状粒子长径比的变化对粒子取向分布的影响不明显，粒子密度对粒子取向分布有一定影响，而流场区域所造成的流场横向速度梯度对粒子取向分布有重要影响．随着流场横向速度梯度增大，粒子取向趋势愈加明显，且当流场横向速度梯度增大到一定程度时，粒子取向都趋向于流动方向．文中部分结果与相关实验进行了比较，两者定性吻合较好。  相似文献   

热解法合成P（AM-co-MAA）/SnO_2有机-无机复合微球的研究     

杨菊香  龙旭  杨晓慧 《西安文理学院学报》2011,(4):33-37

采用反相悬浮聚合法合成了聚丙烯酰胺-甲基丙烯酸（P（AM-co-MAA））微凝胶,并以其作为模板,通过热解法制备了一系列微米级、表面具有特异结构的P（AM-co-MAA）/SnO2有机-无机复合微球材料.详细考察了反应时间、SnCl4的浓度和热解温度等因素对复合微球的形貌结构的影响.通过SEM,XRD,FT-IR,TG等手段来表征复合微球的结构、形貌、含量.微球上沉积的SnO2层随着SnCl4的浓度增大而加厚.采用模板法制备复合材料具有操作过程简单、反应条件温和等特点,因此,可将此方法可进一步拓展到其他有机-无机复合材料的制备中.  相似文献   

追诉时效与刑事诉讼程序之关系的反思——浅析创设追诉时效中止制度的必要性     

苏承涛  李俭彬 《重庆师专学报》2011,(6):106-109

我国刑法在规定司法机关对犯罪人追究刑事责任有效期限的同时,用时效中断、时效延长对追诉时效进行补充,建立了比较完善的体系。由于理论和实践对追诉时效与刑事诉讼程序之间的关系缺乏必要的关注．极少反思案件进入刑事诉讼程序后追诉时效是否继续发挥作用。本文在比较法的视野下,对追诉时效与刑事诉讼程序的关系进行尝试性的厘定,得出我国刑法追诉时效存在的缺陷,为了填补该缺陷而建议在刑法中创设追诉时效中止制度。  相似文献   

双水相萃取在生物技术中的应用     

范芳 《茂名学院学报》2011,21(4):20-23

双水相萃取技术是一项新的分离技术,因其具有独有的特点,应用越来越广泛,在生物技术领域中的应用最为普遍。主要介绍了双水相的种类及应用特点,展示了近三年来双水相萃取技术在生物技术中的应用,最后探讨了双水相萃取技术的应用前景。  相似文献   

Experiments on Cu-isotope fractionation between chlorine-bearing fluid and silicate magma: implications for fluid exsolution and porphyry Cu deposits     

Haihao Guo  Ying Xia  Ruixia Bai  Xingchao Zhang  Fang Huang 《国家科学评论(英文版)》2020,7(8):1319

Hydrothermal fluid is essential for transporting metals in the crust and mantle. To explore the potential of Cu isotopes as a tracer of hydrothermal-fluid activity, Cu-isotope fractionation factors between Cl-bearing aqueous fluids and silicate magmas (andesite, dacite, rhyolite dacite, rhyolite and haplogranite) were experimentally calibrated. Fluids containing 1.75–14 wt.% Cl were mixed together with rock powders in Au₉₅Cu₅ alloy capsules, which were equilibrated in cold-seal pressure vessels for 5–13 days at 800–850°C and 2 kbar. The elemental and Cu-isotopic compositions of the recovered aqueous fluid and solid phases were analyzed by (LA-) ICP–MS and multi-collector inductively coupled plasma mass spectrometry, respectively. Our experimental results show that the fluid phases are consistently enriched in heavy Cu isotope (⁶⁵Cu) relative to the coexisting silicates. The Cu-isotope fractionation factor (Δ⁶⁵Cu_FLUID-MELT) ranges from 0.08 ± 0.01‰ to 0.69 ± 0.02‰. The experimental results show that the Cu-isotopic fractionation factors between aqueous fluids and silicates strongly depend on the Cu speciation in the fluids (e.g. CuCl(H₂O), CuCl₂^– and CuCl₃²⁻) and silicate melts (CuO_1/2), suggesting that the exsolved fluids may have higher δ⁶⁵Cu than the residual magmas. Our results suggest the elevated δ⁶⁵Cu values in Cu-enriched rocks could be produced by addition of aqueous fluids exsolved from magmas. Together with previous studies on Cu isotopes in the brine and vapor phases of porphyry deposits, our results are helpful for better understanding Cu-mineralization processes.  相似文献   

紫外分光光度法测定香丹注射液中水溶性酚和酚酸的总含量   总被引：4，自引：0，他引：4  

夏苗芬  周双林 《科技通报》2004,20(6):549-551

建立了香丹注射液中水溶性酚和酚酸总含量的测定方法．运用紫外分光光度法，在波长280nm处测定，水溶性酚和酚酸总含量在0．005～0．025mg／mL范围内具有良好的线性关系，r=0．9999，平均回收率为99．29％，RSD=0．73％(n=5)．本方法可靠、简单、无干扰，能够有效的控制香丹注射液的质量．  相似文献   

水系锂离子电池体系及电极材料的研究进展     

唐亚鸽  袁光辉 《安康学院学报》2014,(3):97-101

与传统锂离子电池相比,水系锂离子电池具有安全性好、电导率高、装配简易和成本低等优点。本文综述了近年来在该领域研究的电池体系,并从正负极材料、电解液及衰减机理等方面介绍了水系锂离子电池的研究进展,对目前存在的主要问题及发展前景进行了分析展望。  相似文献   

Reducing suspension for minor infraction and improving school climate perceptions among black adolescents via cultural socialization: A multi-informant longitudinal study     

《Learning and Instruction》2022

Racially disparate school disciplinary practices create inequitable circumstances for minority and immigrant youth around the world. In the U.S., Black youth are more likely than their White peers to be suspended for minor, non-violent infractions. This study explores (a) whether school cultural socialization practices reported by Black students (N = 544; M_age (SD) = 12.45 (1.57); 49% boys) and teachers (N = 38; 84% female) were linked to a reduced likelihood of receiving suspensions for minor infractions and (b) the extent to which Black students' perceptions of school climate mediated this relation. Results indicated that school cultural socialization was linked to a decreased likelihood of being suspended for a minor infraction and improved school climate perceptions for Black students. Black students’ perception of school climate mediated the link between school cultural socialization and suspensions for minor infractions. These results highlight school cultural socialization as a promising approach for increasing cultural responsivity and equity within schools, reducing racial bias, and expunging unjust disciplinary responses.  相似文献