2.25Cr-1Mo与铁铝合金高温抗氧化性能的对比研究     

冯欣  金艳 《农机化研究》2004,(3):146-147

对2．25Cr-10钢与铁铝合金的高温抗氧化性能进行了对比研究。铁铝合金具有许多性能上的优点，尤其在其高温抗氧化性能方面。明显优于不锈钢、铬钼钢等传统的高温结构材料，并且随着温度的升高及铝含量的增加，其优势更加显著。  相似文献   

Progress in RNA-binding protein HuR and its roles in development of hepatocellular carcinoma     

SU Ying  JIN Chun  SUN Su-min  LI Zhang-hao  XIA Si-wei  ZHANG Zi-li  ZHANG Feng  SHAO Jiang-juan  ZHENG Shi-zhong 《园艺学报》2021,36(12):2283-2288

RNA-binding proteins （RBP） are molecules with a variety of biological functions discovered in recent years. Among them, HuR is an important RBP, widely expressed in various tissues of the body, and is a member of the Hu/embryonic lethal abnormal vision （ELAV） protein family. It mainly affects the expression levels of target genes in the cells by regulating the stability and/or translation efficiency of the mRNA of the genes, thus participating in the regulation of cell life activities. In recent years, more and more studies on HuR have revealed its important role in inflammation and cancer. This review summarizes the functions of HuR and probes into the regulation of HuR functions. In addition, the roles of HuR in the occurrence and development of hepatocellular carcinoma （HCC） are also discussed, which provides important information for exploring the pathogenesis, biomarkers and therapeutic targets of HCC.  相似文献   

不同垄作根域限制栽培方式对滴灌土壤水盐运移的影响     

靳韦  王昊  陈永伟  王世平  张洪银  马文礼 《北方园艺》2021,(9):93-103

以二年生"宁杞7号"为试材,研究不同垄作根域限制栽培方式下滴灌土壤水盐运移规律,探索滴灌条件下垄作根域限制盐分的灌溉调控方法,以期为宁夏干旱盐碱地种植枸杞等作物提供参考依据.结果表明:当累计灌水量达到1 715.7 m3·hm-2,可有效将处理全沙垄、1/2原土+1/2沙垄、2/3原土+1/3沙垄垄体全盐含量降至轻度盐化土和非盐化土范围,利于枸杞生长;对比各处理垄体盐含量下降速率,掺沙土根限垄作处理全沙垄、1/2原土+1/2沙垄、2/3原土+1/3沙垄有利于盐含量下降;对比各处理苗木成活率,根限垄作栽培模式枸杞苗成活率高于对照,且掺沙土根限垄作处理苗木成活率最高,分别为96.3％、93.1％、100.0％,三者差异不明显.综上所述,对于重度盐化地,可采用"滴灌+掺沙土+垄作根域限制"水盐调控模式进行枸杞种植,应保证在滴灌强化淋洗灌水1 715.7 m3·hm-2以上,方可进行垄体枸杞栽植.  相似文献   

试论大兴安岭地区湿地与冻土的依存关系     

金凤新  吕文博  张芸慧 《防护林科技》2007,(6):69-71

研究了大兴安岭地区湿地与冻土的依存关系,结果表明:湿地与冻土彼此均以对方的存在和状态为重要前提;两者既是独立系统,又是整体复合系统的分支系统。两者依存的机理是:湿地植被层和下覆泥炭层具有独特的热力学性质,即隔热和保储水分,不但使下覆冻土的冷储不易耗散,而且还可以增加冷储量,对冻土起保护增生作用;冻土阻止湿地水的向下散失,有利于湿地化过程的连续性;低温抑制好氧细菌分解过程,亦有利于泥炭积累形成,两者对环境变化表现出基本一致性。  相似文献   

强化木地板耐磨性能及国产化耐磨纸的研究   总被引：1，自引：0，他引：1  

金昌升 《林产工业》2006,33(5):25-29

对强化木地板的耐磨性能和国产化耐磨纸进行了研究,重点考察耐磨纸的生产方式和热压工艺过程对产品耐磨转数和磨耗量的影响。结果表明Al2O3添加量和添加方式对产品的耐磨性能有很大影响,新研制的B型耐磨纸和进口耐磨纸有相似的磨损曲线,其耐磨转数与Al2O3添加量之间呈线性正相关,耐磨转数的增加主要表现在延长第二磨损区域,即提高初始磨损的IP值。热压工艺过程与产品的耐磨性能之间无明确关系。  相似文献   

β-蒎烯合成诺蒎酸的反应条件研究   总被引：4，自引：4，他引：0  

金建忠  沈敏敏  哈成勇 《林产化学与工业》2006,26(2):135-136

研究以松节油中的β-蒎烯为原料,通过KMnO4氧化合成诺蒎酸,并对氧化反应步骤中各因素对反应的影响进行了探讨。制备诺蒎酸的最佳条件为:β-蒎烯、KMnO4、NaOH的物质的量之比1∶2.5∶1,水为溶剂,温度25~30℃,反应时间4~5 h,得率达到35%。  相似文献   

结石通片对小鼠的急性毒性试验及其对乙二酰胺致大鼠肾结石的作用研究     

黎伟华  金学琴  吴璟 《畜牧与饲料科学》2021,42(2):7-10

[目的]研究结石通片对小鼠的急性毒性作用,对健康大鼠的利尿作用,以及对乙二酰胺致大鼠肾结石的调节作用.[方法]取ICR小鼠40只,雌、雄各半,随机分为对照组与给药组,每组20只,观察结石通片给药前后小鼠的体重变化和死亡情况;另取SD大鼠36只,雌、雄各半,分为对照组、低剂量组(给予5％结石通片溶液)和高剂量组(给予10...  相似文献   

SMAS平面下面颈皮瓣修复颊部皮肤缺损     

王绥江  金玉丹  罗少军  梁杰 《湛江医学院学报》2007,25(5):530-532

目的报道SMAS平面下面颈皮瓣修复颊部皮肤软组织缺损的修复方法和疗效。方法于创面邻近部位设计前蒂或后蒂面颈皮瓣,于SMAS平面下掀起皮瓣后向内侧旋转推进覆盖颊区皮肤软组织缺损共20例。结果20例皮瓣均全部成活,其中1例术后腮腺瘘形成。术后随访2~13月,皮瓣外观满意,皮肤浅感觉良好,除1例术后半年内下睑外翻外余无面部器官移位及面神经损伤表现。结论SMAS下面颈皮瓣血供可靠,色泽、质地优良,与颊部匹配,是修复颊部皮肤软组织缺损的理想组织瓣。  相似文献   

Coupling changes of soil functional gene abundances and extracellular enzyme activities across the diagnostic horizons of agricultural Isohumosols     

Zhuxiu LIU  Haidong GU  Xiaojing HU  Zhenhua YU  Yansheng LI  Junjie LIU  Jian JIN  Xiaobing LIU  Guanghua WANG 《土壤圈》2024,34(3):540-552

Soil functional microbial taxa and extracellular enzymes are involved in a variety of biogeochemical cycling processes. Although many studies have revealed the vertical change patterns of microbial communities along soil profile, the general understanding of the coupling changes in the functional gene abundances (FGAs) and extracellular enzyme activities (EEAs) in soil profiles is still limited, which hinders us from revealing soil ecosystem processes. Herein, we comparatively investigated the FGAs and EEAs in the diagnostic A, B, and C horizons of soil profiles obtained from two suborders of Isohumosols (Mollisols), Ustic and Udic Isohumosols, in Northeast China based on quantitative real-time polymerase chain reaction and standard fluorometric techniques, respectively. The distribution patterns of both FGAs and EEAs significantly distinguished by the two soil suborders and were also separated from A to C horizon. Additionally, the variations of EEAs and FGAs were greater in Udic Isohumosols compared to Ustic Isohumosols along soil profiles, and greater changes were observed in C horizon than in A horizon. Both FGAs and EEAs correspondently decreased along the soil profiles. However, when normalized by soil organic carbon, the specific EEAs significantly increased in deep soil horizons, suggesting that microorganisms will input more resources to the production of enzymes to ensure microbial nutrient requirements under resource scarcity. More importantly, we revealed that soil microbial nutrient demands were limited by carbon (C) and phosphorus (P), and the C and P limitations significantly increased along soil profiles with a greater C limitation observed in Ustic Isohumosols than in Udic Isohumosols. Overall, our findings provided solid evidence showing the links between FGAs, EEAs, and microbial nutrient limitations, which would be helpful for a better understanding of the ecosystem processes in soil profiles.  相似文献   

中国林木种业发展现状与展望     

陈伏生  易敏  马际凯  靳藏馥  张露  孙荣喜  郑勇奇 《江西农业大学学报》2021,43(3):488-496

林以种为本,林木种业是林业的命脉和促进林业产业升级的原动力.文章总结了中国林木种业发展现状、成效、面临的问题,分析了国内外林木种业发展趋势,提出了中国林木种业发展目标、任务和对策.70年来,林木种业支撑着中国林业产业的提质增效,在林木种质资源保护、良种基地建设、林木分子育种研究、育种创新及新品种选育等方面取得了实质性进...  相似文献