甲维盐中毒死亡小鼠体内的分布及死后再分布

目的研究甲氨基阿维菌素苯甲酸盐(简称甲维盐)中毒死亡小鼠的致死血浓度、靶器官组织、毒物蓄积库和死后毒物再分布的特征。方法采用灌胃法建立中毒小鼠模型,动态观察急性中毒组、亚急性中毒组小鼠的主要中毒症状和临床死亡时间。观察中毒死后小鼠各器官组织病理形态学改变,应用酶联免疫吸附试验测定死后0、24、48、72h甲维盐体内分布及死后再分布,采用高效液相色谱法测定中毒小鼠的致死血浓度和死后各时间点的血中甲维盐浓度。结果中毒小鼠均在灌胃后15~30 min内依次出现神经、呼吸系统症状。急性中毒组小鼠的临床死亡时间为(45.8±7.9)min,亚急性中毒组为(8.0±1.4)d。甲维盐的急性致死血浓度范围为447.164 0~524.463 5 mg/L。光镜及荧光显微镜下各器官组织均见明显的病理改变;小鼠中毒死后72 h内,血、心、肝、脾、肺、肾及脑甲维盐浓度变化具有规律性(P0.05)。结论甲维盐中毒作用的主要靶器官为心、肝、肾、肺、脑和接触部位(胃),其主要蓄积库为肾、肝,甲维盐在小鼠体内存在死后再分布现象。     

The Green New Deal Must Preserve the Existing Nuclear Fleet

Abstract

As the largest source of carbon-free energy in the United States, nuclear energy must play a vital role in reducing emissions. This article suggests the Green New Deal, an ambitious federal proposal to address climate change, should aim to preserve the existing nuclear fleet by authorizing states to establish zero emission credit (“ZEC”) programs. The ZEC programs will provide credits, in the form of revenue, for the carbon-free attribute of nuclear energy. This article posits the ZEC programs should be based on a model ZEC program developed by the Federal Energy Regulatory Commission and explicitly authorized by amendment of the Federal Power Act to avoid issues of preemption.     

Carbon sink geopolitics

Abstract

This paper explores an example of global politics in action by attending to the modalities and outcomes of United Nations negotiations on global warming. More precisely, the paper ethnographically traces how the capacity of tropical forests to act as carbon sinks is turned into a matter of global concern. The focus is on a negotiated policy called Reducing Emissions from Deforestation and forest Degradation (REDD+) and its anchoring in the Democratic Republic of the Congo, whose territory contains the second largest area of rainforest after Brazil. The paper discusses the importance of the promissory in climate actions, the multivalence of what is at stake and the porosity and resilience of national demarcation. To do so, it identifies three moments and sites of geopolitical re-composition: the formulation of international consensus, the work of preparatory agents and the quest for metrological inclusiveness. These moments and sites point to the theatricality and semi-secrecy of United Nations negotiations, the mobilizing activities of expatriate consultants hired with overseas aid funding and the unstable evidential grounds on which emission reduction efforts are based. The paper suggests that, through this series of processes, the carbon stored by tropical forests becomes a matter of global exigency.     

“于正剧现象”研究

"于正剧现象"的特征是"叫座不叫好"。这种类型的电视剧违背艺术真实的美学原则,文本中充满大量的虚假情节、虚假人物、虚假环境、虚假道具。既不符合直观真实或超现实真实,又不符合主观真实,更难以达到客观真实的美学高度,是一种典型的高碳艺术。大力开发符合艺术真实,特别是实现客观真实的低碳艺术,这是中国电视剧艺术发展的正确方向。     

一起毒鼠强食物中毒的调查分析及其实验室筛查探索

目的　探讨原因不明性食物中毒的检查策略。　方法　结合一起发生的原因不明性食物中毒案例 ,应用流行病学和简易急性动物试验等方法 ,对导致中毒的致病因素进行分析与判定。　结果　中毒案例的暴露时间为早餐时 ,平均潜伏期为 4 7.84分。中毒反应以神经症状和消化道症状为主。依病例的客观特征分层对其食谱分析 ,筛选出水煮豆腐是本次中毒的可疑食物。 7种剩余食物进行的急性动物试验中发现 ,水煮豆腐的小白鼠灌注量与中毒反应呈剂量反应关系 ,半数致死剂量为LD5 0 =1.68mg/ g。气相色谱 - -质谱仪分析确定水煮豆腐中的毒性性质为四次甲基二砜四胺。　结论　本案通过采用症状分析、急性动物实验和毒物分析测定方法确定了一起原因不明性食物中毒的中毒原因。这种检查策略有助于原因不明性食物中毒及其它突发中毒事件的性质判定。     

低碳视角下生态文明城市建设路径研究——以贵阳市为例

2007年12月29日,贵阳市委通过了《中共贵阳市委关于建设生态文明城市的决定》,举全市之力在各个领域进行生态文明城市建设。当前,低碳经济不仅是国内外研究的热门话题,也是国内外经济社会领域实践的热点话题。为了应对日益严峻的温室效应,各国各地区选择了低碳经济的道路。低碳经济是建设生态文明城市的突破口,又可以将生态文明城市建设向纵深推进。     

Green grabs and biochar: Revaluing African soils and farming in the new carbon economy

Biochar currently attracts technological and market optimism, promising multiple wins – for climate change, food security, bioenergy and health – not least for African farmers. This paper examines the political-economic and discursive processes constructing biochar as a novel green commodity, creating new alliances amongst scientists, businesses, venture capital firms and non-governmental organisations. Carbon market logics are not only threatening large-scale land grabs for biochar feedstocks but also other forms of resource, labour and ecological appropriation through driving research and development and shaping small-scale pilot projects. In these, soil carbon is ‘chopped out’ of its ecosystem and social contexts and revalued as exchangeable pieces of carbon nature. Farmers are hailed as green actors and market winners, provided they discipline their practices according to these new technical and market logics. These discourses contrast strongly with the farmers' existing conceptual and practical repertoires; a case study from Liberia illustrates how farmers already manipulate soil carbon in creating locally valued anthropogenic dark earths, but within diverse farming repertoires, ontologies of human–nature interrelationship and historical and political ecologies.     

哥本哈根会议的得失和昭示

哥本哈根会议是一系列全球气候变化会议中最重要的会议,背负着全人类的重托和冀望,虽然此次会议取得了一些重要进展,但因其不具有法律约束力和未提及具体温室气体减排目标,使得相关利益诉求并未得到满意的平衡。会议昭示我们,中国碳减排和低碳经济发展任务十分艰巨,需要切实可行的新思路。     

《资本论》经济伦理视阈下低碳经济发展研究

该文从《资本论》的人道观、自由观、正义论角度出发,对中国建立低碳经济制度进行分析,认为《资本论》对高碳经济的正义审视仍未过时,对建设中国低碳经济的制度保障也不乏现实的启示性。     

复写纸复写笔迹变化的原因探析

与正常书写条件下形成的笔迹相比，复写纸复写笔迹的特征变化性更大，鉴定难度更高。本文阐述了从书写承受物、书写工具、书写时间、书写人心理等方面进行深入研究，探析复写纸复写笔迹变化的几点主要原因，为全面掌握复写纸复写笔迹变化的规律和准确鉴定该类笔迹打下了坚实的理论基础。