用锰矿渣试制硫铝酸盐型快硬早强水泥     

谢建国  钱端芬 《湖南农业大学学报(自然科学版)》1988,15(2)

本文根据木圭锰矿渣化学成分特点和硫铝酸盐水泥熟料各矿物的化学组成和性质,合理地设计该水泥熟料的矿物组成、碱度系数和铝硫此,并掺用其他原料进行了配料。通过对不同煅烧温度下获得的熟料的x 衍射分析数据及参考有关资料,确定料方的煅烧温度,并对试制出的水泥进行了物理检验。结果表明,该水泥具有快硬早强和强度稳定的特点,达到了425~#硫铝酸盐型快硬早强水泥的各项指标。该研究表明该矿渣完全可以用来生产快硬早强硫铝酸盐水泥。  相似文献   

酿造厂虫害调查   总被引：2，自引：1，他引：1  

轩静渊  曹东风 《西南大学学报(自然科学版)》1994,16(2):167-170

１９９２－１９９３年对合川市酿造厂虫害进行调查表明，干酒曲有１３种害虫，以长角扁谷盗Ｃｒｙｐｔｏｔｅｓｔｅｓｍｉｎｕｔｕｓ数量较多，酱油的复合曲醅较单酶曲醅虫害重，主要是酱曲露尾甲，Ｃａｒｐｏｐｈｉｌｕｓｈｅｍｉｐｔｅｒｕｓ和粉斑螟Ｅｐｈｅｓｔｉａｃａｕｔｅｌｌａ。醋的醋醅害虫至少１５种，而以酱曲露尾甲密度最大。  相似文献   

Effect of "Shen Yan Yi Qi Solution" on renal function and histopathology of rats suffering from an experimental nephrotoxic serum nephritis     

LI Ke-ling  WANG Qian  GENG Yi-min  LI Xiao-hong  KANG Hong-jian  WEI Min  HUANG Qi-fu  YAN Jing  WANG Wen-rong 《园艺学报》2004,20(2):200-203

AIM: To investigate the therapeutic effects of "Shen Yan Yi Qi Solution", a chinese Medicine, on nephrotoxic serum nephritis in the rat.METHODS: Nephrotoxic serum nephritis model of the rat was set up by the Clarke’s method. RESULTS: Proteinuria and renal insufficiency occurred in all rats after nephrotoxic serum (NTS) injection, but symptoms in treatment group were reduced. At 2nd week, the typical linear deposition of IgG along the glomerular basement membrane (GBM) was observed by fluorescence microscopy. Mesangial hyperplasia and crescent formation in glomeruli were also observed by light microscopy. In treatment group, all the above lesions were alleviated. CONCLUSION: It demonstrated that "Shen Yan Yi Qi Solution" might alleviate the pathological change of glomeruli and improve renal function.  相似文献   

土壤团聚体形成的研究进展   总被引：32，自引：0，他引：32  

文倩  关欣 《干旱区研究》2004,21(4):434-438

土壤团聚体是土壤结构的基本单位,它的形成与稳定是自然过程与人类活动的综合结果,即受生物与非生物因素如土地利用方式改变、耕作和种植制度等多种因素的影响。由于团聚体的形成原因及土壤环境条件不同,不同粒级的团聚体在土壤肥力上表现出不同的性质和特征。  相似文献   

印度洋西北部海域鸢乌贼资源密度分布的初步分析   总被引：1，自引：0，他引：1  

陈新军  钱卫国 《上海海洋大学学报》2004,(3):218-223

根据2003年9-11月印度洋西北海域鸢乌贼资源的调查和渔获统计资料,采用效能比方法,对鸢乌贼资源密度指标CPUE值进行了估算。结果发现,在重点调查海域,鸢乌贼的资源密度较高,其CPUE值为0.01～10.0尾/线/h,总平均值为2.456尾/线/h。资源密度的分布随海域而不同。在12°N以南海域CPUE值一般在1.0尾/线/h以下,在12°～14°N、58°～61°E间海域CPUE值在2.0～2.5尾/线/h,而在中心渔场16°N、61°E附近海域,CPUE值为最高,达到5.5尾/线/h以上。  相似文献   

全球化进程与农村就业分析     

王传荣  钱乃余 《安徽农业大学学报》2004,(2):20-23

当前农民的就业问题成为“三农”中最突出的问题。加入WT()后,我国进一步置身于全球化之中,这势必会对农村劳动就业产生深远的影响。本文分析了全球化背景下中国农村劳动就业形势,并针对全球化对农村就业的冲击提出相应对策。  相似文献   

双肌性状形成的分子机理及其研究进展   总被引：3，自引：0，他引：3  

张利红  马健  党如意  刘茜 《畜牧兽医杂志》2004,23(5):19-21

肌肉生成是一个复杂的正负调控过程,双肌品种以其特有的饲料报酬高、瘦肉率高’、生长快在近几年来逐步受到育种专家的重视。研究表明,肌肉生长抑制素(mysatatin,MSTN)缺失或突变会导致肌肉过度生长或肥大,即双肌现象;双肌性状受常染色体上一对等位基因控制,存在主基因效应。现从肌肉生长机理入手,分别从不同家畜双肌现象阐明该性状的分子机理及其应用前景。  相似文献   

Quantification of selected aroma-active compounds in Pinot noir wines from different grape maturities     

Fang Y  Qian MC 《Journal of agricultural and food chemistry》2006,54(22):8567-8573

Effect of grape maturity on aroma-active compounds in Pinot noir wine was investigated using stir bar sorptive extraction-gas chromatograph-mass spectrometry (SBSE-GC-MS). High correlation coefficient (> 0.95) and low standard deviation (< 10%) were obtained for all aroma-active compounds of interest. Two vintages of Pinot noir wines with three different grape maturities each were analyzed. Statistical analysis showed that both grape maturity and growing year significantly affected the aroma composition of the final wine. Analysis of wine samples from the same vintage indicated that grape maturity could affect aroma compounds in different ways, based on their biochemical formation in the wines. For most short-chain fatty acid esters, there were no obvious trends with grape maturity, however, the concentrations of ethyl 2-methylpropanoate and ethyl 3-methylbutanoate consistently decreased with grape maturity. The decreasing trend was also observed for other esters including ethyl cinnamate, ethyl dihydroxycinnamate, and ethyl anthranilate, with the exception of ethyl vanillate, while C13 norisoprenoids, monoterpenes, and guaiacols had increasing trends with grape maturation.  相似文献   

Effect of high-pressure-moderate-temperature processing on the volatile profile of milk     

Vazquez-Landaverde PA  Torres JA  Qian MC 《Journal of agricultural and food chemistry》2006,54(24):9184-9192

The effects of high hydrostatic pressure on volatile generation in milk were investigated in this study. Raw milk samples were treated under different pressures (482, 586, and 620 MPa), temperatures (25 and 60 degrees C), and holding times (1, 3, and 5 min). Samples submitted to heat treatments alone (25, 60, and 80 degrees C for 1, 3, and 5 min) were used for comparison. Trace volatile sulfur compounds were analyzed using solid-phase microextraction (SPME) and gas chromatography (GC) with pulsed-flame photometric detection (PFPD), whereas the rest of the volatile compounds were analyzed using SPME-GC with flame ionization detection (FID). Multivariate analysis of variance (MANOVA) and principal component analysis (PCA) were used to study the effect of pressure, temperature, and time on volatile generation. Relative concentration increases of 27 selected volatile compounds were compared to an untreated sample. It was found that pressure, temperature, and time, as well as their interactions, all had significant effects (P < 0.001) on volatile generation in milk. Pressure and time effects were significant at 60 degrees C, whereas their effects were almost negligible at 25 degrees C. The PCA plot indicated that the volatile generation of pressure-heated samples at 60 degrees C was different from that of heated-alone samples. Heat treatment tended to promote the formation of methanethiol, hydrogen sulfide, methyl ketones, and aldehydes, whereas high-pressure treatment favored the formation of hydrogen sulfide and aldehydes.  相似文献   

基于COI基因的入侵物种旧金山卤虫遗传多样性与遗传分化研究     

付春正  王晖  Alireza Asem  郭慧芳  钱彬彬  刘文茹  沈春阳 《河北渔业》2022,(2):1-6,32

伴随着中国水产养殖业的快速发展,原产美国的旧金山卤虫(Artemia franciscana)被引入至我国渤海湾地区.为研究旧金山卤虫被引入中国后其基因组遗传多样性改变情况,本研究利用COI线粒体分子标记,评估旧金山卤虫在非原生栖息地,即唐山曹妃甸南堡镇(渤海湾,河北省)定殖的旧金山卤虫的遗传多样性现状.研究分析发现:...  相似文献