胰岛素受体酪氨酸蛋白激酶对醛糖还原酶的磷酸化作用

从人胎盘纯化了醛糖还原酶和部分纯化了胰岛素受体。通过磷酸化实验证明：醛糖还原酶是胰岛素受体酪氨酸蛋白激酶的底物，经分析揭示：胰岛素受体酪氨酸蛋白激酶可将醛糖还原酶的第４０位和第４９位的酪氨酸残基磷酸化。在试管内，未磷酸化的醛糖还原酶和磷酸化的醛糖还原酶的动力学常数无差异，而细胞内的情况有待于进一步研究，本实验提示：醛糖还原酶除具酶活性外，可能还有在细胞内传递胰腺素信息的功能。     

无醛人造板产品与技术发展现状及前景分析

在此对我国目前的人造板制造工业进行简要的概述,对能够影响人造板制造工业的因素进行在调查研究和分析,并在此基础上对无醛人造板技术和产品进行介绍,对其发展前景进行分析,以期能够不断促进无醛人造板产品和技术的发展,满足人们的发展需要。     

炔醛法合成1,4-丁炔二醇催化剂研究进展

概述了以炔醛法合成1,4-丁炔二醇催化剂的最新研究,通过介绍有机锂催化剂、Lewis酸催化剂、铜铋催化剂在炔醛化反应中的应用,分析了炔醛化反应原理及存在的副反应。重点介绍了铜铋催化剂在工业炔醛法生产1,4-丁炔二醇中的研究及应用,讨论了载体、颗粒大小、金属负载量对铜铋催化剂性能的影响,分析了催化剂结构与催化效果之间的关系,并展望了催化剂的发展前景。     

消息报道

<正>迈入无醛"智造+"时代亨斯迈发布聚氨酯"无醛添加"胶合板连续压机自动线2019年6月4日,全球领先的特殊化学制品企业亨斯迈集团,携手包括国家林业和草原局林产工业规划设计院在内的多方本土及国际优势力量,共同发布了聚氨酯"无醛添加"胶合板连续压机自动生产线,展示了跨国企业与本土伙伴在无醛添加胶合板的跨界实力。未来胶合板针对工业领域内的国际化合作范本如何创新、中国胶合板行业的蓝海市场中如何发展,亨斯迈给出了一个有力答案。     

以EDTA—香草醛为光亮剂的DE型无氰镀锌

DE 型无氰碱性镀锌在推广应用中迂到茴香醛光亮剂货沅短缺的问题,为此我们在汲取兄弟单位经验的基础上,研究了以EDTA—香草醛组合光亮剂代替茴香醛,效果良好,镀液的电化学特性和镀层的物理性能完全可同茴香醛光亮剂媲美。     

无醛装饰纸贴面豆胶胶合板的工艺研究

目的为了解决装饰纸贴面人造板的游离甲醛问题,探究无醛装饰纸贴面胶合板的优化工艺和贴面后涂饰水性聚氨酯的表面耐磨性能。方法采用无醛豆胶为胶黏剂制备装饰纸贴面豆胶胶合板,并在其表面涂饰无醛水性聚氨酯涂料的方法。按照相关国标,检测和分析不同工艺参数对无醛装饰纸贴面豆胶胶合板的表面胶合强度以及不同水性聚氨酯涂料涂饰量对耐磨性能的影响。结果在实验区间内,当无醛豆胶的单面施胶量为200 g/m2,热压温度为150℃,热压时间为1.5 min,热压压力为1 MPa时,无醛装饰纸贴面豆胶胶合板的表面胶合强度最高;当无醛水性聚氨酯涂料的表面涂饰量为190 g/m2时,无醛装饰纸贴面豆胶胶合板的表面耐磨性能最佳。结论采用无醛豆胶为胶黏剂制备胶合板时,无醛豆胶具有较好的渗透性能,无醛水性聚氨酯涂料具有良好的表面性能。     

RC高光泽喷墨打印照片纸吸墨涂层的研究

详细阐述了高光相纸涂层材料的填料、胶粘剂、固色剂和其他添加剂，并介绍了高光喷墨打印相纸的主要评价方法。     

底层和固色剂对油画布色密度的影响

市面常见的亚面油画布的色密度较低．本研究通过涂布合适的底层及吸墨层中使用匹配的固色剂来提高亚面油画布的色密度，获得高质量的亚面油画布以适合喷墨印刷的基本性能和复制性能。     

固色剂对喷墨打印宣纸色彩还原性的影响

为改善喷墨打印宣纸因出现洇墨现象造成色彩还原性(仿真度)低的现象,本文选择了水性聚氨酯和聚二甲基二烯丙基氯化铵两种阳离子固色剂添加至宣纸涂层中,试图通过对固色剂的优化选择来提高喷墨打印宣纸的色彩还原性。结果表明两种固色剂单独添加时对喷墨打印宣纸的吸附固着墨水的能力均起到积极作用;而将水性聚氨酯和聚二甲基二烯丙基氯化铵以1∶3的比例复配使用时吸墨固墨效果更好。     

利用含氮衍生物对羰基的加成反应以降低107胶游离甲醛含量

用不同的含氮衍生物，分别除去１０７胶中的游离醛。研究得出不同含氮衍生物除去游离醛的工艺条件和程度。     

Development of formaldehyde-free leathers in the perspective of retanning: part II. Combination of formaldehyde-free retanning syntans

There is a growing demand for the formaldehyde-free leathers in global leather market due to increasing awareness towards eco-labelling. The first part of this work described the optimisation of formaldehyde-free syntans in their applications as single syntans in making leathers with desired properties. In this work the use of formaldehyde-free syntans in combination to produce leathers with desired properties has been attempted. Three combination-retanning systems have been chosen using formaldehyde-free resin, acrylic and protein syntans. The performance of leathers in terms of bulk and strength properties is shown to be comparable or even better for all the combination-retanning systems chosen compared to the control system. In particular, Experiment “C” (resin syntan 3%, acrylic syntan 4% and protein syntan 2%) provides leathers with improved bulk, strength and colour properties as well as reduced COD and TS loads, besides not having free formaldehyde. Scanning electron microscopic study reveals that the extent of filling in all the three combination-retanning systems is similar.     

A new method of making particleboard with a formaldehyde-free soy-based adhesive

A soy-based formaldehyde-free adhesive consisting of soy flour (SF) and a curing agent (CA) has been successfully used for the production of plywood. However, this adhesive cannot be easily sprayed onto wood particles for making particleboard because of its high viscosity. The following new method of using this adhesive was developed and investigated. SF was first mixed with water to form dilute soy slurry that could be easily coated onto wood particles. The soy-coated wood particles were dried to certain moisture content and then further coated with an aqueous curing agent. Effects of particleboard density, adhesive usages for both core and face particles, the solids content of the soy slurry, hot-press time, hot-press temperature, the storage time of the wet soy-coated wood particles, and the SF/CA weight ratio on the internal bond strength (IB), the modulus of rupture (MOR), and the modulus of elasticity (MOE) of particleboard were investigated.     

缩短彩色负片冲洗时间的技术依据

彩色负片的高温快速冲洗工艺c-41的标准时间是30分,新的彩色冲洗工艺RAc-41缩短到10分钟左右,尤其适用于冲洗非专业性的、一般业余照相,这种大幅度缩短彩色冲洗工艺时间是由于采用一系列新技术,如采用新的漂白液和漂白加速剂、取消了漂白和定影之间的水洗、使用新型定影液、在定影液中加入了尿素作为定影促进剂、用超级稳定液代替最后水洗等等,本文对此详加解释。     

Surface chemical analysis of Tencel treated with a cationic fixing agent

The nature and wash durability of the cationic fixing agent Matexil FC-ER applied to Tencel fabric, at pH 6 and 11, respectively, was investigated by X-ray Photoelectron Spectroscopy (XPS). The N(1s) XPS spectrum of the Matexil FC-ER film indicated that the concentration of uncharged and quaternary nitrogen species was in the ratio of 5:1. For both pH 6 and pH 11 applications, the surface concentration of the cationic fixative appeared to be independent of pH and the relative proportion of cationic nitrogen relative to the original film, increased at the fibre surface. The ISO 105 CO6/C2S wash test removes the uncharged nitrogen from the fibre surface leaving only the cationic nitrogen species. The surface Matexil FC-ER was durable to washing, while in contrast a direct dye applied to the Tencel fibre was not. Combination with the cationic fixing agent increased the fastness of the dye at the Tencel fibre surface.     

Transfer of impulsive loading on cladding panels to the fixing assemblies

The fixing assemblies for prefabricated cladding panels on buildings, are often designed on an empirical basis, to support the dead weight of the panel, wind loads and possibly temporary loads arising during construction. If, subsequently, the design loads are accidentally exceeded but the panel is undamaged; it may be necessary to check the condition of the fixings. A physical check would require costly dismantling and reconstruction of the panel but, as an alternative, this paper presents an analysis of the force transferred to cladding fixing assemblies when the panel is subjected to impulsive loading, using the finite element analysis program, DYNA3D. The results were validated with experimental results from impact tests on a steel plate supported on four steel bars. Having obtained this validation, a finite element analysis was then carried out to determine the response of fixings for panels under different levels of blast loading using two different models for the panel-fixing assemblies. The first model considers only the effect of out-of-plane fixing, whilst in the second model both the out-of-plane fixings and in-plane fixings are considered. It was observed that forces transferred to fixings include an axial force, shear forces, and bending moments and these force components can vary along the length of the fixing. Inspections of cladding panels, after being subjected to impulsive loads, often show that the connection between the fixing and the panel and between the fixing and the support structure are more vulnerable to impulsive loading than the panel itself. The FE analysis has shown that forces in the fixings are related to the dynamic response of the cladding panel; hence damage to the fixings could be deduced from damage to the panel.     

Partially adhesive fixation of reconstruction plates at midfacial fractures – an alternative solution to screw fixation?

For the prognosis and long‐term stability of an implant, for example a hip‐ or knee‐implant, the anchorage to the bone is of critical importance. Normally for this anchorage bone cement is used, which achieves sufficient retention to spongious bone structure. If there is the need for osteosynthesis of midfacial fractures for surgical therapy, in some situations it would be clinically preferable to fix the reconstruction plates without the usual system using screws. This is the aim of the new adhesive fixing technology which is presented in this article. The structure of bone in midface, however, is cortical and such a smooth surface will allow only insufficient retention forces between bone and bone cement. In order to obtain a good adhesion at cortical bone nevertheless, we have to apply a bone bonding agent similar to techniques used in dentistry, which are based on dentin bonding agents, because there are different wetting properties of the hydrophilic bone and the hydrophobic bone cement monomers. Determination of achievable bond strength was done in a tension test ex vivo. Reconstruction plates were fixed with bone cement at bovine bone conditioned with a bone bonding agent developed for this field of application. With bond strengths up to 6 MPa it is assumed that an adhesive fixation of reconstruction plates at cortical bone structure is possible using the developed amphiphilic bone bonding agent.     

Some Aspects of Developer and Fixing Bath Concentrates Based on Potassium and Ammonium Salts Respectively

The limited solubility of some potassium salts in comparison to corresponding sodium salts is known from analytical chemistry; the analytical behaviour of ammonium salts is similar to that of potassium salts.

On the other hand, potash and potassium sulphite which are of interest for photographic developers ore several times as soluble as soda and sodium sulphite. Most developer concentrates, therefore, contain potassium salts. However, certain processing conditions may lead to turbidity or precipitation in the developers, due to the formation of sparingly soluble potassium hydroquinone disulphonate.

Commercial fixing bath concentrates contain ammonium thiosulphate which is much more soluble than sodium thiosulphate. Potassium thiosulphate is only slightly more soluble than sodium thiosulphate and, moreover, proves useless as a fixing agent. Fixing baths on the basis of ammonium thiosulphate are superior to those based on the corresponding sodium compound in the processing of films containing silver iodide.

In practical use the formation of crystalline deposits containing ammonium, silver, iodide and thiosulphate ions may occur.     

Estimating the approximation error when fixing unessential factors in global sensitivity analysis

One of the major settings of global sensitivity analysis is that of fixing non-influential factors, in order to reduce the dimensionality of a model. However, this is often done without knowing the magnitude of the approximation error being produced. This paper presents a new theorem for the estimation of the average approximation error generated when fixing a group of non-influential factors. A simple function where analytical solutions are available is used to illustrate the theorem. The numerical estimation of small sensitivity indices is discussed.     

室温条件下纳米银的温和制备和形貌调控

目的 探究室温条件下不同还原剂以及其他实验助剂在化学还原纳米银过程中对其颗粒粒径、尺寸分布和形貌的影响。方法 以抗坏血酸为还原剂,聚乙烯吡咯烷酮（PVP）为分散剂,柠檬酸钠为保护剂和第2还原剂,选择葡萄糖和硼氢化钠作对照,在室温下通过化学还原的方法来制备纳米银颗粒。通过马尔文激光粒度仪、紫外–可见光谱（UV–vis）、透射电镜（TEM）等对所制备纳米银进行表征。结果 采用抗坏血酸作为还原剂时,通过调控抗坏血酸体积（0.2 mL）,固定柠檬酸钠和PVP体积分别为0.5、0.6 mL,制备出粒径较小（平均粒径为56 nm）且尺寸分布较均一的球形纳米银;采用葡萄糖和硼氢化钠作还原剂时纳米银颗粒尺寸过大（平均粒径分别为216nm和189nm）。结论 采用抗坏血酸作为还原剂,调控柠檬酸钠、PVP等实验参数在最佳范围,更容易制备出球形度好、粒径小的均匀纳米银溶液。     

Local Thermal Fixing of a Photorefractive LiNbO(3) Hologram by use of a CO(2) Laser

A real-time, in situ fixing method by use of heating with a CO(2) laser beam is suggested for thermal fixing of a small local hologram in the bulk of a Fe:LiNbO(3) photorefractive crystal. For heating up to 100 degrees C-200 degrees C a volume with a shape similar to that of the laser beam a heat-guiding technique is developed. On the basis of the heat-transfer equations, different heating modes-with or without metal absorbers for heat guiding-obtained by use of a continuous or pulsed laser beam are analyzed. The optimal mode may be pulsed heating with absorbers. On this basis experiments have been designed and demonstrated. It is seen that the fixing process with CO(2) laser beam is short compared with the process by use of an oven, and the fixing efficiency is quite high.