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近年来,各炭素企业为了扩大再生产和替换陈旧设备,相继加快了石墨电极机床数字化改造步伐,不仅降低了操作者的劳动强度,提高了生产效率,而且减少了人为误差,提高了控制精度,保证了加工质量. 相似文献
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前些天在杂志上看到过一个故事,说的是中国人和犹太人的区别,一个犹太人建了一所加油站,生意很好,第二个犹太人来了,就在加油站旁边建了一座购物中心,生意同样很好,第三个犹太人来了,就在旁边又建了一座游乐场,生意照样很好,第四个犹太人来了,就开了一家4S店,生意也是好的不得了,第五个犹太人来了,他建的是公共卫生间,也赚到了钱。可是在我国呢,第一个人建了一个加油站,赚钱了,第二个人看到了,觉得有利可图,也建了一个加油站,结果第三个,第四个, 相似文献
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活性氧化铝载体的孔结构 总被引:13,自引:0,他引:13
本文阐述了载体活性氧化铝孔的产生及类型,提出了孔结构的网络模型,讨论了影响氧化铝孔结构的几种因素,介绍了几种控制孔结构的方法,并综合考虑了氧化铝孔结构与其它物性间的关系而提出了一些看法。 相似文献
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列举了某公司尼龙生产线己二酸装置氧化反应器搅拌在多年运行中常见的损坏形式.分析了原因,提高了对氧化反应器搅拌的重视程度,及时对其采取预防措施.这些举措延长了搅拌器的使用寿命,保证了尼龙六六盐生产线的平稳运行,减少了生产成本,提高了经济效益. 相似文献
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Sabrina Bilotta Julian Arbogast Nadine Schart Maurice Frei Axel Lorentz 《International journal of molecular sciences》2022,23(3)
Mast cells are involved in allergic and other inflammatory diseases. The polyphenol resveratrol is known for its anti-inflammatory properties and may be used as nutraceutical in mast cell associated diseases. We analyzed the effect of resveratrol on mast cells in vivo in ovalbumin-induced allergic enteritis as well as experimental colitis in IL-10−/− mice which received resveratrol via drinking water. Treatment with resveratrol prevented the increase in mast cells in both allergic enteritis and chronic colitis in duodenum as well as in colon. Further, it delayed the onset of diseases symptoms and ameliorated diseases associated parameters such as tissue damage as well as inflammatory cell infiltration in affected colon sections. In addition to the findings in vivo, resveratrol inhibited IgE-dependent degranulation and expression of pro-inflammatory cytokines such as TNF-α in IgE/DNP-activated as well as in LPS-activated bone marrow-derived mast cells. These results indicate that resveratrol may be considered as an anti-allergic and anti-inflammatory plant-derived component for the prevention or treatment of mast cell-associated disorders of the gastrointestinal tract. 相似文献
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天然防紫外线产品研究概况 总被引:6,自引:1,他引:5
综述了国内外已研究的天然防紫外线成分的种类(国内:芩芦凝胶、复配天然紫外吸收剂、沙棘油、扇贝多肽、人参和绿茶等;国外:芦荟、水飞蓟和陈皮等);介绍了研究采用的方法和结果;并从头发防晒、儿童防晒、防晒剂复合运用和口服防晒剂等角度展望了天然防紫外线产品的应用潜力和发展趋势;同时也指出了现阶段研究的缺陷。 相似文献
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室温离子液体(ionic liquids, ILs)作为一种新型的绿色环保溶剂,由于其特殊的功能化结构及热稳定性好、挥发度低和溶解能力强等特点,目前被广泛应用于纳米材料的制备领域。本文重点介绍了离子液体在纳米材料制备中的应用及相关研究的最新进展,结合一些示例对本领域进行了概述,其中包括离子液体作为溶剂,例如作为反应介质和稳定剂;模板剂,例如利用离子液体的微结构(胶束和囊泡、液晶凝胶、乳液和微乳液)作为纳米材料合成中的模板和软模板;反应物,例如作为反应中的还原剂和反应组分;以及离子液体微乳液在纳米材料制备中的特殊用法进行了总结,并讨论了离子液体在快速发展的纳米材料制备领域中的存在挑战和机遇。 相似文献
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Makiko Mochizuki-Kashio Hiroko Shiozaki Toshio Suda Ayako Nakamura-Ishizu 《International journal of molecular sciences》2021,22(9)
Hematopoietic stem cells (HSCs) reside in a hypoxic microenvironment that enables glycolysis-fueled metabolism and reduces oxidative stress. Nonetheless, metabolic regulation in organelles such as the mitochondria and lysosomes as well as autophagic processes have been implicated as essential for the determination of HSC cell fate. This review encompasses the current understanding of anaerobic metabolism in HSCs as well as the emerging roles of mitochondrial metabolism and lysosomal regulation for hematopoietic homeostasis. 相似文献
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磷酸生产技术开发的进展 总被引:11,自引:1,他引:11
针对热法磷酸生产耗电量高,湿法磷酸生产对磷矿质量要求严,以及我国中低品位磷矿资源特点,介绍了我国自行开发的窑法磷酸特点、工艺流程和试验结果,以及热法磷酸生产中热能回收技术的进展,认为这两项新工艺、新技术效果显著,应尽快促使实现工业化。 相似文献
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Green seeds are used as a grading factor in estimating chlorophyll in canola and rapeseed in the Canadian and U.S.A. grading
systems. This work examines the effect that sampling and perception have on the estimation of green seeds as well as the effect
that sampling has on the determination of chlorophyll. Individual seed analysis indicated that in order to be considered as
green, seeds needed to contain between 200 and 400 mg/kg chlorophyll. Variation due to binomial sampling played a predominant
role in the error in determining the green seed levels in canola. Sampling of large numbers of seeds, as in the loading of
export shipments, reduced the error. Binomial sampling also contributed to the error in chlorophyll determination even with
sample sizes as large as 500. Differences in perception of green also were noted between individuals with coefficients of
variation as high as 50% at the 1% green seed level. The combination of perception error and sampling error may result in
samples of 1,000 seeds drawn from a mass with 2% green seeds having green seed counts ranging from 0.96 to 3.04%, 19 times
out of 20. 相似文献
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薛涛 《纤维素科学与技术》2012,20(2):46-50
以废弃棉短绒为模板,采用溶胶凝胶技术制备出新型多孔碳模板,研究了纤维素碳化的机理。多孔碳的收缩率随着树脂/棉短绒复合体中树脂含量的增大而减小;所得多孔碳的气孔率随着树脂/棉短绒复合体中树脂含量的增大而减小,也随着碳化温度的升高而减小;多孔碳的弯曲强度随着树脂/棉短绒复合体中酚醛树脂含量的增大而增大,也随着碳化温度的升高而增大。 相似文献
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Fred vandeVelde NídiaD. Loureno HelenaM. Pinheiro Martin Bakker 《Advanced Synthesis \u0026amp; Catalysis》2002,344(8):815-835
Immobilisation of both enzymes and whole‐cell systems is of major importance in the improvement of the stability, activity and reusability of these biocatalysts. This review describes the use of the naturally occurring polysaccharide carrageenan as a support for the immobilisation of biocatalysts. Carrageenan is a food‐grade and biocompatible support material extracted from red seaweeds. Before focusing on the use of carrageenan as an immobilisation support, an overview is given of the present uses of biocatalysts in industrial processes. The basic concepts of enzyme and whole‐cell immobilisation are discussed, as well as the background of carrageenan as a biopolymer. Several examples of enzymes and whole‐cell systems immobilised in carrageenan are discussed. A list of the most relevant patents in this field is presented as well as a list of enzymes and cell systems immobilised in carrageenan as described in the literature. 相似文献
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Ezrin is one of the members of the ezrin/radixin/moesin (ERM) family of proteins. It was originally discovered as an actin-binding protein in the microvilli structure about forty years ago. Since then, it has been revealed as a key protein with functions in a variety of fields including cell migration, survival, and signal transduction, as well as functioning as a structural component. Ezrin acts as a cross-linker of membrane proteins or phospholipids in the plasma membrane and the actin cytoskeleton. It also functions as a platform for signaling molecules at the cell surface. Moreover, ezrin is regarded as an important target protein in cancer diagnosis and therapy because it is a key protein involved in cancer progression and metastasis, and its high expression is linked to poor survival in many cancers. Small molecule inhibitors of ezrin have been developed and investigated as candidate molecules that suppress cancer metastasis. Here, we wish to comprehensively review the roles of ezrin from the pathophysiological points of view. 相似文献