Adenylate cyclase in the developing rat cerebral cortex and olfactory bulb

Activities of adenylate cyclase, measured either in the absence or presence of sodium fluoride and Triton X-100, are determined in cerebral cortex and olfactory bulb homogenate of rats of 1 to 35 days of postnatal age. Differences in properties of the enzyme in the 2 structures are demonstrated.     

三端点二端口网络的分析及其应用

介绍了一种特殊的二端口网络即三端点网络。分析了三端点网络连接于其他网络时，网络节点导纳矩阵的变化。     

A New Synthesis Method of Single Crystalline CuO Nanoribbons

One-dimensional (1D) nanoscale materials (nanotubles, nanorods, nanowires and nanobelts or nanoribbons and so on) are currently of a matter of much interest. Due to their unique properties in electronics, magnetics, optics, and mechanics, they can be used to design and fabricate nanosensors, switches, nanolasers, transistors and other nanodevices[1]. In order to obtain desired one-dimensional materials, many techniques and methods have been developed[2].……     

提高企业数控机床使用效率的思考

数控加工技术的开发和应用已经成为工业制造业确保产品质量和效益的必备手段，如何发挥数控机床的使用功能，提高设备潜力与使用效率成为许多企业的迫切要求。简述了数控机床对企业发展的作用，针对企业数控机床的使用现状，对其优势和不足进行了分析，并提出一些改善措施。     

CONTROLLING DARKENING REACTIONS DURING MECHANICAL PULPING WITH ADDITIVES - A POSSIBLE APPROACH TO IMPROVING BRIGHTNESS AND BLEACHABILITY

The first part of this paper summarizes relevant literature information, which rationalizes our selection of chemicals. The second part reports some preliminary screening results. We have investigated a wide range of reagents, chosen for their different chemistries and divided into seven classes: (1)reducing agents, (2) reduced sulfur compounds, (3)hydrogen donors, (4) antioxidants and radical scavengers, (5) nucleophiles, (6) chelating agents,and (7) oxidizing bleaching agents. It is noted that some chemical reagents fall into more than one class.The obtained results will be discussed with respect to the effectiveness of each class.     

Biomedical Application of Laser

INTRODUCTIONLasershaverevolutionizedresearchanddevelopmentinmedicineanddentistry .Theyhaveledtode velopmentandproductionofmanynewproducts .Laserapplicationsindiagnosis,treatmentandsurgeryareenormousandhaveledtospeedyandmoreefficientresults,aswellasbetterandquickerhealingProcesses.Theapplicationscouldbeclassifiedintermsofareasofusesorintermsofinstruments/products.Inthispa per,discussionswillnotbegroupedinaparticularfashion ,butwi1lbeonspecificapplications .Alotofin formationontheseapplica…     

跨国营销道德状况及影响因素分析

跨国营销道德是用来判定跨国营销活动正确与否的道德标准。文章从两个方面分析了跨国营销的道德问题：一是违反公司及行业道德规范的行为。包括营销方面的隐瞒和欺诈、胁迫和腐败行为及逃避纳税义务等；二是跨文化价值观冲突引起的道德困境，突出表现为母国和东道国在法律和规范上存在的冲突。制约跨国营销道德性决策的因素有很多，可概括为外部因素与内部因素两大类。要提高跨国营销道德水准，防止不道德的营销行为，必须同时从内外两方面着手。     

Different responses of two Mosla species to potassium limitation in relation to acid rain deposition

The increasingly serious problem of acid rain is leading to increased potassium (K) loss from soils, and in our field investigation, we found that even congenerically relative Mosla species show different tolerance to K-deficiency. A hydroponic study was conducted on the growth of two Mosla species and their morphological, physiological and stoichiometric traits in response to limited (0.35 mmol K/L), normal (3.25 mmol K/L) and excessive (6.50 mmol K/L) K concentrations. Mosla hangchowensis is an endangered plant, whereas Mosla dianthera a widespread weed. In the case of M. hangchowensis, in comparison with normal K concentration, K-limitation induced a significant reduction in net photosynthetic rate (P _n), soluble protein content, and superoxide dismutase (SOD) activity, but an increase in malondialdehyde (MDA) concentration. However, leaf mass ratio (LMR) and root mass ratio (RMR) were changed little by K-limitation. In contrast, for M. dianthera, K-limitation had little effect on P _n, soluble protein content, SOD activity, and MDA concentration, but increased LMR and RMR. Critical values of N (nitrogen):K and K:P (phosphorus) ratios in the shoots indicated that limitation in acquiring K occurred under K-limited conditions for M. hangchowensis but not for M. dianthera. We found that low K content in natural habitats was a restrictive factor in the growth and distribution of M. hangchowensis, and soil K-deficiency caused by acid rain worsened the situation of M. hangchowensis, while M. dianthera could well acclimate to the increasing K-deficiency. We suggest that controlling the acid rain and applying K fertilizers may be an effective way to rescue the endangered M. hangchowensis.