竹红菌甲素对人黑色素瘤B-16细胞的杀伤效应

从生物学角度上对竹红菌甲素(HA)光敏活性进行了研究，运用MTT法实验发现HA合并光照处理人黑色素瘤B-t6细胞，HA对B-16细胞具有明显的杀伤作用，使癌细胞存活率显著下降，结果表明HA具有光敏抗癌活性。     

再谈平行板电容器内介质极化的功能过程

通过介质在电容器中所受横向张力对外做功的计算，利用热力学第一定律求得介质在极化过程中无偶极子动能的增加，从而找到介质插入电容器后电能损失的原因：转变成机械能．     

Pyrolysis Characteristics and Kinetics of Municipal Solid Waste

Based on a systemic survey, the pyrolysis characteristics and apparent kinetics of the municipal solid waste （ MSW） under different conditions were researched using a special pyrolysis reactor, which could overcome the disadvantage of thermo-gravimetric analyzer. The thermal decomposition behaviour of MSW was investigated using thermo-gravimetric （ TG ） analysis at rates of 4.8,6.6,8.4, 12.0 and 13. 2 K/min. The pyrolysis characteristics of MSW were also studied in different function districts. The pyrolysis of MSW is a complex reaction process and three main stages are found according to the results. The first stage represents the degradation of cellulose and hemicellulose, with the maximum degradation rate occuring at 150℃ -200 ℃： the second stage represents dehydrochlorination and depolymerization of intermediate products and the differential thermogravimetric （ DTG ） curves have shoulder peaks at about 300℃： the third stage is the decomposition of the residual big molecular organic substance and lignin at 400 ℃- 600 ℃. Within the range of given experimental conditions, the results of non-linear fitting algorithm and experiment are in agreement with each other and the correlation coefficients are over0. 99. The kinetic characteristics are concerned with the material component and heating rate. The activation energy of reaction decreases with the increase of heating rate.     

Comparison of learning in two context-based university chemistry classes

ABSTRACT

Context-based learning (CBL) is advocated as beneficial to learners, but more needs to be understood about how different contexts used in courses influence student outcomes. Gilbert defined several models of context that appear to be used in chemistry. In one model that achieves many criteria of student meaning-making, the context is provided by ‘personal mental activity’, meaning that students engage in a role to solve a problem. The model’s predicted outcomes are that students develop and use the specialised language of chemistry, translate what they learn in the immediate context to other contexts, and empathise with the community of practice that is created. The first two of these outcomes were investigated in two large-enrolment university chemistry courses, both organised as this CBL model, in which students were introduced to kinetic molecular theory (KMT). Sample 1 students (N₁?=?105) learned KMT through whole-class kinaesthetic activity as a human model of a gas while focusing on a problem identifying substances in balloons filled with different gases. Sample 2 students (N₂?=?110) manipulated molecular dynamics simulations while focusing on the problem of reducing atmospheric CO₂. Exam answers and pre-/post-test responses, involving a new KMT context, were analysed. Students in Sample 1 demonstrated a stronger understanding of particle trajectories, while Sample 2 students developed more sophisticated mechanistic reasoning and greater fluidity of translation between contexts through increased use of chemists’ specialised language. The relationships of these outcomes to the contexts were examined in consideration of the different curriculum emphases inherent in the contexts.     

高电荷态离子入射Ta表面形成的靶原子的特征光谱线

报道了用动能一定而电荷态不同的^40Ar^9 离子和动能不同的^40Ar^6 离子入射金属Ta表面，靶原子受激辐射发出的200—1000nm波段的特征光谱线的实验结果。实验结果表明：高电荷态离子所激发的靶原子的谱线强度与入射离子的电荷态密切相关，与靶原子的入射动能没有强的相关性。     

山西省大同市男性不育患者弓形虫感染情况调查

目的：探讨男性不育患者弓形虫（TOX）感染的状况及感染后对男性生殖功能的影响。方法：用酶联免疫吸附试验（ELISA）法检测男性不育患者血中弓形虫循环抗原（CAg），IgG及IgM抗体。结果：100例男性不育患者血清中CAg阳性者13例（13％），TOX—IgM阳性者16例（16％）；而100例生殖功能正常的男性血清中CAg阳性者仅为1例（1％），TOX—IgM阳性者3例（3％）；两者间差异非常显著（P〈0．01）。两者TOX-IgG阳性者均为7例（7％）。结论：TOX急性（早期）感染可能会影响男性生育能力，并导致男性不育。因此，男性也应注意避免感染弓形虫，防止导致不育的情况发生。     

犯罪心理结构的弱化：犯罪人走向新岸的必由之路

从微观层面来看,犯罪现象的遏制和消灭归根结底需要犯罪人的犯罪心理结构走向弱化。犯罪心理结构的弱化具有丰富的理论内涵,存在着真与假、虚与实、浅与深、共性与个性交织混杂的不同形态,其过程大体要经历内心斗争、心理突破、心理反复和走向新岸等四个阶段。要实现这一过程,需要具备由外界积极因素和内部积极因素所整合建构的动能系统。     

硝酸二氨合银(Ⅰ)配合物的脱氨反应动力学机理研究

用非等温热重法研究了硝酸二氨合银(Ⅰ)配合物[Ag(N H3)2]N O3的脱氨反应机理。非等温热重数据通过ACHAR法和COATS-REDFERN法进行拟合,得到反应的微分动力学函数f(α)=3/2[(1-α)-1/3-1]-1,积分动力学函数g(α)=(1-2/3α)-(1-α)2/3,活化能E1=104.1991kJ/m ol,E2=20.0172kJ/m ol;指前因子A1=4.07×108/s,A2=4.94×108/s,动力学补偿效应方程lnA1=3.1633E1+30.395;lnA2=4.5939E2+43.537     

非惯性系下机械能守恒定律

从质点组相对运动动力学方程出发，考虑每个质点受到的惯性力，推导出非惯性系的动能定理，并在此基础上对机械能守恒进行研究，给出了惯性力为保守力的条件．     

Non-Isothermal Desolvation Kinetics of Erythromycin A Acetone Solvate

Erythromycinis a mixture of macrolide antibiotics pro-duced bystreptomyces erythreus.Treatment withthis antibi-otic drugin humanand veterinary practiceis still verycom-mon because of the highactivityagainst gram-positive and afewgram-negative strains[1]. …