Soil erosion by wind is one of the most important processes in the changing the earth's surface in semi-arid areas,Thus it is of great importance to study soil-erosion action.Using integrated technologies of remot...Soil erosion by wind is one of the most important processes in the changing the earth's surface in semi-arid areas,Thus it is of great importance to study soil-erosion action.Using integrated technologies of remote sensing and geochemistry radioactivity iso-tope to extract regional soil-erosion information and to calculate quantity of soil erosion is accomplished successfully in this paper by means of beneficial experiments in the Talatan region of the Gonghe Basin,which is located in northeastern Qinghai-Tibet Pla-teau in China.The results show that the soil erosion by wind is not intensive in this region;the erosion types belong to the classes of very-soft erosion and soft-erosion type,which account for 47.12 percent and 35.58 percent,respectively,of the total study area.In total,two kinds of soil erosion account for 82.70 percent of the study area;only a small area belongs to the classes of severe erosion and very-severe erosion;this area is about 22.14 km2.Severe deposition activity has taken place in this region,and has appeared in a large area(322.67 km2),which accounts for 11.78 percent of the total study area.The results of this study show that soil erosion and deposition inventories are 870,000-1,150,000 tons and 550,000-780,000 tons,respectively,per year.The soil in-ventory shows about 320,000-370,000 tons from Talatan to Longyangxia reservoir per year.Using remote-sensing technology and 137Cs techniques is a valid means to analyze and to evaluate the quantity of soil erosion by wind in semi-arid environments.展开更多
目的分析老年腔隙性脑梗死(LI)患者血清微小RNA(miR)-377、miR-137水平及临床意义。方法选择2021年2月至2022年12月哈励逊国际和平医院收治的老年LI患者248例作为LI组,另选择同期来我院体检的健康者110例作为健康组;根据美国国立卫生研...目的分析老年腔隙性脑梗死(LI)患者血清微小RNA(miR)-377、miR-137水平及临床意义。方法选择2021年2月至2022年12月哈励逊国际和平医院收治的老年LI患者248例作为LI组,另选择同期来我院体检的健康者110例作为健康组;根据美国国立卫生研究院卒中量表(NIHSS)评分将老年LI患者248例分为神经缺损组60例(≥2分)和无神经缺损组188例(<2分)。检测血清miR-377、miR-137水平;用Pearson相关性分析和Spearman相关性分析;logistic回归分析老年LI患者神经缺损影响因素;ROC曲线评估血清miR-377、miR-137水平对老年LI及神经缺损诊断的预测价值。结果LI组血清miR-377、miR-137水平低于健康组(P<0.01)。miR-377和miR-137联合评估老年LI的曲线下面积(AUC)为0.782(95%CI:0.735~0.824),高于二者单一检测(P<0.01)。神经缺损组脑动脉硬化、血红蛋白降低、肿瘤坏死因子α(TNF-α)、白细胞介素(IL)1、IL-6、IL-17、C反应蛋白(CRP)、改良的Rankin量表(mRS)评分高于无神经缺损组(P<0.05,P<0.01),血清miR-377、miR-137水平低于无神经缺损组(0.61±0.25 vs 0.89±0.28,0.61±0.24 vs 0.85±0.27,P<0.01)。血清miR-377与miR-137水平呈正相关(P<0.01);血清miR-377、miR-137水平与TNF-α、IL-6、CRP、mRS评分均呈负相关(P<0.01)。miR-377、miR-137、TNF-α、IL-6、CRP是老年LI患者神经缺损的影响因素(P<0.01)。miR-377、miR-137联合评估老年LI患者神经缺损的AUC为0.812(95%CI:0.758~0.859),高于二者单一检测(P<0.05,P<0.01)。结论血清miR-377、miR-137水平在老年LI及其神经缺损患者血清中表达较低,检测其水平具有一定临床预测价值。展开更多
基金financed by the Institute of Qinghai Salt Lakes,Chinese Academy of Sciences (contract KZCX2-SW-118)The open fund of State Key Laboratory of Estuarine and Coastal Research also supported this research.
文摘Soil erosion by wind is one of the most important processes in the changing the earth's surface in semi-arid areas,Thus it is of great importance to study soil-erosion action.Using integrated technologies of remote sensing and geochemistry radioactivity iso-tope to extract regional soil-erosion information and to calculate quantity of soil erosion is accomplished successfully in this paper by means of beneficial experiments in the Talatan region of the Gonghe Basin,which is located in northeastern Qinghai-Tibet Pla-teau in China.The results show that the soil erosion by wind is not intensive in this region;the erosion types belong to the classes of very-soft erosion and soft-erosion type,which account for 47.12 percent and 35.58 percent,respectively,of the total study area.In total,two kinds of soil erosion account for 82.70 percent of the study area;only a small area belongs to the classes of severe erosion and very-severe erosion;this area is about 22.14 km2.Severe deposition activity has taken place in this region,and has appeared in a large area(322.67 km2),which accounts for 11.78 percent of the total study area.The results of this study show that soil erosion and deposition inventories are 870,000-1,150,000 tons and 550,000-780,000 tons,respectively,per year.The soil in-ventory shows about 320,000-370,000 tons from Talatan to Longyangxia reservoir per year.Using remote-sensing technology and 137Cs techniques is a valid means to analyze and to evaluate the quantity of soil erosion by wind in semi-arid environments.
文摘目的分析老年腔隙性脑梗死(LI)患者血清微小RNA(miR)-377、miR-137水平及临床意义。方法选择2021年2月至2022年12月哈励逊国际和平医院收治的老年LI患者248例作为LI组,另选择同期来我院体检的健康者110例作为健康组;根据美国国立卫生研究院卒中量表(NIHSS)评分将老年LI患者248例分为神经缺损组60例(≥2分)和无神经缺损组188例(<2分)。检测血清miR-377、miR-137水平;用Pearson相关性分析和Spearman相关性分析;logistic回归分析老年LI患者神经缺损影响因素;ROC曲线评估血清miR-377、miR-137水平对老年LI及神经缺损诊断的预测价值。结果LI组血清miR-377、miR-137水平低于健康组(P<0.01)。miR-377和miR-137联合评估老年LI的曲线下面积(AUC)为0.782(95%CI:0.735~0.824),高于二者单一检测(P<0.01)。神经缺损组脑动脉硬化、血红蛋白降低、肿瘤坏死因子α(TNF-α)、白细胞介素(IL)1、IL-6、IL-17、C反应蛋白(CRP)、改良的Rankin量表(mRS)评分高于无神经缺损组(P<0.05,P<0.01),血清miR-377、miR-137水平低于无神经缺损组(0.61±0.25 vs 0.89±0.28,0.61±0.24 vs 0.85±0.27,P<0.01)。血清miR-377与miR-137水平呈正相关(P<0.01);血清miR-377、miR-137水平与TNF-α、IL-6、CRP、mRS评分均呈负相关(P<0.01)。miR-377、miR-137、TNF-α、IL-6、CRP是老年LI患者神经缺损的影响因素(P<0.01)。miR-377、miR-137联合评估老年LI患者神经缺损的AUC为0.812(95%CI:0.758~0.859),高于二者单一检测(P<0.05,P<0.01)。结论血清miR-377、miR-137水平在老年LI及其神经缺损患者血清中表达较低,检测其水平具有一定临床预测价值。
