陇东地区三叠系长9油层组物源及沉积相研究

在前人研究的基础上,结合野外露头剖面、岩心观察、成像测井特征、碎屑岩组分特征、石英阴极光以及重矿物特征分析等方法,对鄂尔多斯盆地陇东地区长9油层组进行了物源分析。研究表明,物质来源来于4个方向,即东北、西北、西南和南缘,且主要受西南部物源方向影响。母岩以西南部祁连-秦岭褶皱带、西北阿拉善古陆和南部古秦岭高级变质岩和酸性岩浆岩为主体。在上述研究的基础上,结合沉积相标志分析,对该研究区进行了沉积相、亚相以及微相的识别和划分。研究区西北部分主要发育三角洲平原和三角洲前缘;西南和东北主要发育三角洲前缘沉;陇东地区东北角部分发育滨-浅湖亚相沉积。结合物源和沉积相研究,进一步总结出分流河道、河口坝以及远砂坝等微相为砂体有利储集相带。     

镇原地区长8物源分析

通过对鄂尔多斯盆地西南部镇原地区延长组长8砂岩的岩石学特征、轻重矿物组合特征、古水流方向、碎屑粒度变化及稀土元素分配模式等的研究,探讨了源区母岩性质。结果表明,研究区长8沉积期的主要物源来自西南方向;源区母岩主要为西南缘陇西古陆及南部秦岭古陆的前震旦系及下古生界的变质岩系。     

鄂尔多斯盆地志丹探区三叠系延长组物源分析

物源方向的确定对沉积相研究及能源勘探开发具有重要意义。依据大量分析化验数据,根据砂岩岩石学特征、轻重矿物组合特征、古水流方向、碎屑粒度变化等,对研究区延长组物源进行综合研究。结果表明,志丹探区延长组有东北部和南部两个物源方向,且以东北部物源为主,南部物源只对局部有影响;该区延长组母岩主要来自盆地东北缘的太古代及早元古代变质岩。     

鄂尔多斯盆地三岔-贺旗地区长6、长8油层组物源区分析

根据研究区的轻、重矿物组合的平面变化,结合粒度统计资料、区域沉积背景及野外实测古水流方向来分析研究区在长6、长8油层组沉积期的物源方向,认为研究区目的层主要沉积物来源于盆地的西南缘六盘山古陆和陇西古陆。     

大庆长垣以西地区扶余油层重矿物特征及物源分析

通过对大庆长垣以西地区扶余油层重矿物组合特征和稳定系数变化特征研究,划分了该地区的沉积区域,并恢复了各沉积分区的母岩性质和物源方向。认为研究区存在北部、西北部和西南部三大物源,北部物源影响范围较大,西北部和西南部物源影响范围较小。     

延长探区南部盒8段稀土元素地球化学示踪

延长探区南部盒8段具有较大的天然气勘探开发潜力。通过分析延长探区南部盒8段泥岩样品中稀土元素地球化学特征,探讨了延长探区盒8段沉积环境及成岩物质来源。结果表明,研究区盒8段泥岩轻重稀土元素比值较大,分异程度较高,属于轻稀土中度富集型,δ(Ce)和Ceanom指示泥岩沉积时期水体整体处于缺氧的还原环境中,稀土元素特征和La/Yb-ΣREE判别图解指示延长探区南部盒8段构造环境稳定,存在多源分区性,源岩物质来自上地壳,源岩主要为花岗岩、沉积岩与钙质泥岩混合区,物源区主要为南部的祁连—秦岭古陆造山带的沉积岩母岩区和源自大陆边缘抬升基底型的花岗岩母岩区。     

文南地区沙二下亚段沉积相研究

利用测井、岩芯资料,对东濮凹陷文南地区沙二下亚段的沉积相进行了研究,沙二下亚段沉积环境为洪水—漫湖背景下形成的三角洲沉积体系,主要发育三角洲分流河道砂体、前缘席状砂体,漫湖砂坪砂体和浊积砂体.同时利用砂体展布、重矿物等资料对沙二下亚段沉积期的物源进行了分析,存在四个物源区,即东部、西部、北部、南部物源区.其中鲁西隆起和内黄隆起是东西两大物源供给区,南部物源资料尚不清楚.母岩主要有早古生代碳酸盐岩和白云岩组成,少量太古代结晶变质岩和中、新生代中酸性花岗岩.     

鄂尔多斯盆地西南部上三叠统延长组下段物源分析

根据古地理面貌、古水流方向、轻、重矿物组合特征以及稀土元素分配模式,对鄂尔多斯盆地西南部延长组下段沉积物源进行了分析。结果表明：研究区是一个汇集西、西南、南及东北各方向物源而沉积的一个混源区,但以西南方向为主要物源方向,母岩既有来自盆地外围造山带太古、元古界石英岩、中基性、中酸性火山岩、中深变质岩,也有盆地边缘古隆起区古生界碳酸盐岩、泥岩和砂砾岩。     

铁边城地区长4+5油组重矿物特征及物源分析

铁边城地区延长组长4+5油组常见的重矿物有锆石、电气石、石榴石和白钛矿,依据重矿物的形貌特征及稳定性的平面变化趋势,可将它们自北东到西南划分为3个组合分带:石榴石+锆石+电气石、锆石+石榴石+电气石、锆石+电气石。重矿物组合特征及碎屑岩组分特征在平面上的变化趋势,表明北东方向为铁边城地区的主要物源区。石英的阴极发光特征表明研究区的母岩主要为中—低级变质岩系,说明北东方向的吕梁山和大青山区为该区的主要供屑区。     

海拉尔盆地贝中地区南屯组物源分析

物源分析技术主要包括碎屑成分对比技术、重矿物分析技术、沉积相分析技术、地球化学分析技术、石英阴极发光分析技术等。研究区范围相对不大,但是构造相对复杂,受多方向物源供给的影响较大,因此,在确定贝中地区南屯组沉积时的物源区母岩性质和物源方向时,采用多种分析方法加以综合判别,其中以碎屑物成分和轻、重矿物组合和砂岩百分含量变化为主要手段,得出研究区存在2个物源方向:一是正东和北偏东方向的主物源方向,物源来自于东部布勒洪布斯隆起带;二是西南方向和西北方向的次要物源方向,物源来自于西部苏德尔特隆起带。     

佛山市顺德新城区降水中污染物的监测和分析

为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。     

Metabolism of trideuterated iso-lignoceric acid in rats in Vivo and in human fibroblasts in culture

Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders, but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-²H₃]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured. A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994.     

Phospholipid metabolism in cells in culture

The proportions of the different lecithin fractions have been determined in HeLa and KB tissue culture cells and Ehrlich Ascites tumor. 82.8% of the total phosphatidyl choline phosphorus is found in fraction 3 of HeLa cells. The major phosphatidyl cholines found in KB cells and Ehrlich Ascites tumor are in fractions 3 and 4 and representing 66.6% and 88.7% of the total phosphatidyl choline P, respectively. The incorporation of 1,2-¹⁴C-choline and 1,2-¹⁴C-ethanolamine into the various phosphatidyl choline fractions has been assayed to determine their biosynthesis in Ehrlich Ascites tumor. The incorporation of 1,2-¹⁴C-choline into fractions 3 and 4 is 100 times the 1,2-¹⁴C-ethanolamine. This evidence indicates that the methylation pathway of phosphatidyl choline synthesis is very low in HeLa, KB and Ehrlich Ascites cells. One of 13 papers presented at the symposium “Lipid Metabolism in Cells in Culture,” AOCS Meeting, Houston, May 1971. Part of a thesis submitted to the Graduate School of the University of North Dakota in partial fulfillment of the Degree of Master of Science.     

高效液相色谱法分析化妆品中微量成分的研究进展

综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。     

Denitrification in shallow groundwater in a coastal agricultural area in Japan

In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L^–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L^–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO₂ L^–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site.