弄清碳收支变化是促进区域可持续发展的重要方面。研究结合光合能力模型(Photosynthetic Capacity Model,PCM)和呼吸遥感模型(Remote Sensing Model for Ecosystem respiration,Re-RSM)提出了一个完全基于遥感数据的陆地碳收支动态评估...弄清碳收支变化是促进区域可持续发展的重要方面。研究结合光合能力模型(Photosynthetic Capacity Model,PCM)和呼吸遥感模型(Remote Sensing Model for Ecosystem respiration,Re-RSM)提出了一个完全基于遥感数据的陆地碳收支动态评估模型(Remote Sensing Land Carbon Budget Dynamic Assessment Model,RS-CBM),引入中国三北地区(东北、华北和西北地区)7种植被类型(玉米农田、针阔混交林、落叶针叶林、高寒草地、灌丛草甸、荒漠草原和芦苇湿地)的多年碳通量观测数据对RS-CBM模型进行参数化和验证,并应用此模型定量评估了2001—2020年三北地区植被NEE的时空特征与规律。结果表明,RS-CBM模型的模型精度高达0.75,均方根误差为0.07 mol·m^(-2)·d^(-1),RS-CBM模型的NEE模拟值与通量观测值具有较好的一致性,在不同植被类型的生长季旺盛期均出现较明显的碳吸收峰值,但存在不同程度的峰值低估现象。2001—2020年三北地区的NEE变化呈波动上升趋势,年平均值为82.01 g·m^(-2)·a^(-1),年平均增长量为5.843 g·m^(-2)·a^(-1),总体表现为碳汇。三北地区NEE在空间上呈现南高北低,东高西低的空间分异性。综上,RS-CBM模型能较好地模拟出三北地区碳收支变化和空间分布,具有在区域尺度模拟NEE时空变化的潜力。展开更多
目的:系统分析缺血性卒中与冠心病共患病的临床特征与疗效评价方法。方法:基于国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)及PubMed、ScienceDirect、Web of Science数据库检索缺血性卒中与冠心...目的:系统分析缺血性卒中与冠心病共患病的临床特征与疗效评价方法。方法:基于国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)及PubMed、ScienceDirect、Web of Science数据库检索缺血性卒中与冠心病共患病自1990年1月至2023年9月的相关文献,统计临床信息、评价指标,运用频数统计分析法归纳缺血性卒中与冠心病共患病的临床特征及疗效评价方法。结果:共纳入文献168篇,其中理论探讨类文献10篇,临床研究类文献158篇,患者8287例。缺血性卒中与冠心病共患病的临床症状按频次排序为半身不遂(58.67%)、胸痛(55.40%)、乏力(38.89%)、头晕(37.10%)、口角㖞斜(36.94%)等,证候要素分布为血瘀(23.53%)、痰湿(22.58%)、气虚(17.97%)、阴虚(15.10%)等。缺血性卒中与冠心病共患病与单患疾病的临床理化指标比较,血脂(20%)、血压(18.67%)、血糖(8%)相关指标差异较大,临床研究疗效评价常用指标有疾病主要症状改善程度(64.58%)、总胆固醇(47.92%)、神经系统功能缺损评分(25.00%)等。结论:缺血性卒中与冠心病共患病的临床症状、证候要素、主要证候、理化指标具有自身的临床特点,疗效评价方法多采用疾病主要症状。展开更多
文章综述了农田镉、砷污染现状、环境风险及其来源,阻控作物镉、砷吸收的关键技术环节,包括农业投入品控制、水分管理、土壤钝化调控、叶面调理、低吸收作物品种选择与替代种植、秸秆移除削减等。结合"土十条",提出镉、砷污...文章综述了农田镉、砷污染现状、环境风险及其来源,阻控作物镉、砷吸收的关键技术环节,包括农业投入品控制、水分管理、土壤钝化调控、叶面调理、低吸收作物品种选择与替代种植、秸秆移除削减等。结合"土十条",提出镉、砷污染农田作物安全种植的几点思考:一是建立基于耕地-农产品污染等级的安全种植技术体系;二是采取集成农艺措施进行综合防控,重点提出作物安全种植VIRL(Variety-Input and Irrigation-Root zone and Removal of straw-Leaf blade)技术模式。该模式将源头预防(农业投入)、过程阻控(作物本身镉、砷吸收特性,影响作物地下部与地上部镉、砷吸收的各个环节)、末端治理(秸秆移除修复)高度统一起来,然后根据耕地-农产品污染等级,采取或紧或松的关键(联合)技术调控,实现镉、砷污染农田的安全种植;三是对镉、砷复合污染农田同步防控问题进行了探讨和展望。展开更多
Human papillomavirus(HPV) genital infection is a very common sexual transmitted disease.Mostly,the infection is transient and asymptomatic.The induction of effective immune responses usually allows the infection to be...Human papillomavirus(HPV) genital infection is a very common sexual transmitted disease.Mostly,the infection is transient and asymptomatic.The induction of effective immune responses usually allows the infection to be spontaneously cured.However,the infection sometimes can be responsible for an intraepithelial lesion,which may progress to be cervical cancer.Cervical cancer is one of the most common neoplastic diseases affecting women.It is clear that carcinogenic HPV infection is the necessary process for the development of cervical cancer.HPV infection is very frequent in young women aged less than 25 years and viral clearance lasts for 8 months in average.This clearance is the consequence of host immunity intervention,which leads to spontaneous regression of infection and the overwhelming majority of low-grade squamous intraepithelial lesions(more than 80% within a period of 2 years).The major factor,which permits the progression to high grade squamous intraepithelial lesions and invasive cervical cancer,is the persistent feature of HPV infection.HPV infection is usually transient,but several factors were identified as host factors(genetic,immunodepression,oral contraception and smoking) and viral factors(genotype,variants,viral load and integration) to increase the persistence.Cervical cancer is clearly the first virus-induced solid tumor discovered in human.Furthermore,it represents a woman death cause that can be avoided.展开更多
文摘目的:系统分析缺血性卒中与冠心病共患病的临床特征与疗效评价方法。方法:基于国家知识基础设施数据库(CNKI)、中国学术期刊数据库(CSPD)、中文科技期刊数据库(CCD)及PubMed、ScienceDirect、Web of Science数据库检索缺血性卒中与冠心病共患病自1990年1月至2023年9月的相关文献,统计临床信息、评价指标,运用频数统计分析法归纳缺血性卒中与冠心病共患病的临床特征及疗效评价方法。结果:共纳入文献168篇,其中理论探讨类文献10篇,临床研究类文献158篇,患者8287例。缺血性卒中与冠心病共患病的临床症状按频次排序为半身不遂(58.67%)、胸痛(55.40%)、乏力(38.89%)、头晕(37.10%)、口角㖞斜(36.94%)等,证候要素分布为血瘀(23.53%)、痰湿(22.58%)、气虚(17.97%)、阴虚(15.10%)等。缺血性卒中与冠心病共患病与单患疾病的临床理化指标比较,血脂(20%)、血压(18.67%)、血糖(8%)相关指标差异较大,临床研究疗效评价常用指标有疾病主要症状改善程度(64.58%)、总胆固醇(47.92%)、神经系统功能缺损评分(25.00%)等。结论:缺血性卒中与冠心病共患病的临床症状、证候要素、主要证候、理化指标具有自身的临床特点,疗效评价方法多采用疾病主要症状。
文摘文章综述了农田镉、砷污染现状、环境风险及其来源,阻控作物镉、砷吸收的关键技术环节,包括农业投入品控制、水分管理、土壤钝化调控、叶面调理、低吸收作物品种选择与替代种植、秸秆移除削减等。结合"土十条",提出镉、砷污染农田作物安全种植的几点思考:一是建立基于耕地-农产品污染等级的安全种植技术体系;二是采取集成农艺措施进行综合防控,重点提出作物安全种植VIRL(Variety-Input and Irrigation-Root zone and Removal of straw-Leaf blade)技术模式。该模式将源头预防(农业投入)、过程阻控(作物本身镉、砷吸收特性,影响作物地下部与地上部镉、砷吸收的各个环节)、末端治理(秸秆移除修复)高度统一起来,然后根据耕地-农产品污染等级,采取或紧或松的关键(联合)技术调控,实现镉、砷污染农田的安全种植;三是对镉、砷复合污染农田同步防控问题进行了探讨和展望。
文摘Human papillomavirus(HPV) genital infection is a very common sexual transmitted disease.Mostly,the infection is transient and asymptomatic.The induction of effective immune responses usually allows the infection to be spontaneously cured.However,the infection sometimes can be responsible for an intraepithelial lesion,which may progress to be cervical cancer.Cervical cancer is one of the most common neoplastic diseases affecting women.It is clear that carcinogenic HPV infection is the necessary process for the development of cervical cancer.HPV infection is very frequent in young women aged less than 25 years and viral clearance lasts for 8 months in average.This clearance is the consequence of host immunity intervention,which leads to spontaneous regression of infection and the overwhelming majority of low-grade squamous intraepithelial lesions(more than 80% within a period of 2 years).The major factor,which permits the progression to high grade squamous intraepithelial lesions and invasive cervical cancer,is the persistent feature of HPV infection.HPV infection is usually transient,but several factors were identified as host factors(genetic,immunodepression,oral contraception and smoking) and viral factors(genotype,variants,viral load and integration) to increase the persistence.Cervical cancer is clearly the first virus-induced solid tumor discovered in human.Furthermore,it represents a woman death cause that can be avoided.
