Human Health Risk Assessment of Penicillin/Aminopenicillin Resistance in Enterococci Due to Penicillin Use in Food Animals

Penicillin and ampicillin drugs are approved for use in food animals in the United States to treat, control, and prevent diseases, and penicillin is approved for use to improve growth rates in pigs and poultry. This article considers the possibility that such uses might increase the incidence of ampicillin-resistant Enterococcus faecium (AREF) of animal origin in human infections, leading to increased hospitalization and mortality due to reduced response to ampicillin or penicillin. We assess the risks from continued use of penicillin-based drugs in food animals in the United States, using several assumptions to overcome current scientific uncertainties and data gaps. Multiplying the total at-risk population of intensive care unit (ICU) patients by a series of estimated factors suggests that not more than 0.04 excess mortalities per year (under conservative assumptions) to 0.14 excess mortalities per year (under very conservative assumptions) might be prevented in the whole U.S. population if current use of penicillin drugs in food animals were discontinued and if this successfully reduced the prevalence of AREF infections among ICU patients. These calculations suggest that current penicillin usage in food animals in the United States presents very low (possibly zero) human health risks.     

累积的异质性：生命历程视角下的老年人分化

本文以生命历程理论为研究视角，以深度访谈的方法收集老年人“主诉”的关于过去的生活资料，试图通过对个人能动性与生命历程时间性的强调，来分析个体生命历程与社会变迁的相互嵌入过程，以及这一过程中不断分化的内部机制。研究发现，老化的过程是一个随时间推移不断累积与分化的过程，累积因素的先后顺序对个体之间的分化具有重要意义，累积是生命历程资本遭遇生命历程风险的结果，是社会结构与个人能动性相互作用的动态过程，其中社会政策的变迁对累积过程具有决定性的影响。     

Intimate Violence in Lesbian Relationships

This paper describes the findings of a survey of 1109 lesbians who attended the Women's Music Festival held in Michigan in carly August 1985. The primary objectives of the study were to document the incidence of domestic violence in a non-random sample of lesbian relationships; to identify and describe the types of domestic violence experienced and/or perpetrated; and to ascertain thc availability and accessibility of community helping resources to survivors and perpetrators after an abusive episode. Comparisons with domestic violence in heterosexual relationships are also made, followed by a discussion on the research and practice implications of the findings.     

Predicting infectious disease outbreak risk via migratory waterfowl vectors

The spread of an emerging infectious disease is a major public health threat. Given the uncertainties associated with vector-borne diseases, in terms of vector dynamics and disease transmission, it is critical to develop statistical models that address how and when such an infectious disease could spread throughout a region such as the USA. This paper considers a spatio-temporal statistical model for how an infectious disease could be carried into the USA by migratory waterfowl vectors during their seasonal migration and, ultimately, the risk of transmission of such a disease to domestic fowl. Modeling spatio-temporal data of this type is inherently difficult given the uncertainty associated with observations, complexity of the dynamics, high dimensionality of the underlying process, and the presence of excessive zeros. In particular, the spatio-temporal dynamics of the waterfowl migration are developed by way of a two-tiered functional temporal and spatial dimension reduction procedure that captures spatial and seasonal trends, as well as regional dynamics. Furthermore, the model relates the migration to a population of poultry farms that are known to be susceptible to such diseases, and is one of the possible avenues toward transmission to domestic poultry and humans. The result is a predictive distribution of those counties containing poultry farms that are at the greatest risk of having the infectious disease infiltrate their flocks assuming that the migratory population was infected. The model naturally fits into the hierarchical Bayesian framework.     

气藏水平井连续携液理论与实验

在气藏水平井中随着生产管柱倾斜角度的变化，井筒内液体的重力作用会发生改变，从而引起气液两相流型的变化。以产气为主的气井井筒内液体主要以液膜、液滴的形式出现，由此出现了液滴模型与液膜模型两种解释积液的理论。从这两种携液理论出发，考虑生产管柱倾斜角度的影响，对倾斜管内液滴、液膜进行受力分析，推导出了随管柱倾斜角度变化的连续携液临界流速的计算式，使之适用于水平井连续携液临界流量的计算。设计制作了水平气井连续携液实验装置并进行了实验研究，观测气藏水平井中气水两相运动与流型变化情况并测试其临界携液气量，结果表明，气藏水平井中水平井段的液体以液膜携带为主，但直井段中越接近井口，越以液滴携带为主，液滴模型也能适用于计算气藏水平井的连续携液临界流速。     

朝鲜族人口自然增长率下降对发展的影响

本文分析了朝鲜族人口减少的主要原因及负面影响,并提出了解决的对策.     

彝族社会中"尔普"形式的变迁

凉山彝族社会中的“尔普”(份子钱 )是一种礼物交换形式。对“尔普”的研究和分析 ,可有助于人们理解凉山彝族社会。“尔普”本来是维系彝族传统社会宗族内部亲属组织的纽带 ,由于文化变迁的原因 ,后来发展出了跨宗族的“尔普”新形式 ,又由于族群互动的原因 ,还产生了跨越族群的“尔普”形式。“尔普”形式的变迁是族群互动下的一种文化变迁形式 ,其动力来源于彝、汉两族的互动关系。彝族社会中“尔普”的变迁形式是人类学关于族群互动下的文化变迁理论的鲜活事例。     

继嗣与交换:地域社会的构成--对摩哈苴彝村的历史人类学分析

关于地域社会的构成,宗族继嗣理论注重宗族裂变的作用,社会交换理论则强调"女性交换"的意义.本文通过对摩哈苴彝村口述史材料的分析,揭示了如下两个基本事实第一,宗族裂变分支的散布与婚姻联盟的范围在地域上可以是吻合的,由此消除了继嗣理论与交换理论的对立;第二,在父系社会中,不仅存在着"男性的继嗣"与"女性的交换",而且也存在着"女性的继嗣"与"男性的交换",后者亦为地域社会构成的重要路径.     

人工栽培山野豌豆研究初报

本试验通过连续四年的观测，认为山野豌豆是适合大面积栽培的优良豆科牧草，该草利用年限长、耐践踏，更适于做人工放牧地的骨干豆科牧草．     

中日音乐文化交流的历史渊源

本文追溯了中日音乐文化交流的历史渊源,认为两国历史上音乐文化的交流是相互的,友好的,促进了两国音乐文化的发展。