Who captures the marks for the Petersen estimator?

Summary.  We examine the claim that the well-known Petersen estimator which is used in population size estimation was not in fact used by the scientist after whom it is named. We show how, in the early years of the last century, the modern use of the Petersen estimator grew from that of the fishing coefficient. Contending with the somewhat conflicting claims that were made at the time, and what by modern standards is poor referencing of sources, we investigate where the credit lies for these concepts, and the principles and protocols which support them. We assess also how far attributions of credit were affected by practical considerations, and the history of the estimator by the nature of the problems being pursued. We identify scientists whose early work on marking and estimating fish populations deserves more credit than it has received.     

“I've been independent for so damn long!”: Independence, masculinity and aging in a help seeking context

This paper draws on semi-structured interviews conducted with 36 older men to examine how older men's understandings of independence relate to their help seeking behaviours and health service use. We argue that discourses of masculinity and successful aging are both represented in men's talk about independence. Recognising that these discourses are intertwined is important for understanding how older men seek help and use health services. We outline the practice and policy implications of viewing older men's help seeking behaviours in this way, and how it might be useful for promoting older men's health.     

Non-parametric estimation of population size from capture–recapture data when the capture probability depends on a covariate

Summary.  In capture–recapture experiments the capture probabilities may depend on individual covariates such as an individual's weight or age. Typically this dependence is modelled through simple parametric functions of the covariates. Here we first demonstrate that misspecification of the model can produce biased estimates and subsequently develop a non-parametric procedure to estimate the functional relationship between the probability of capture and a single covariate. This estimator is then incorporated in a Horvitz–Thompson estimator to estimate the size of the population. The resulting estimators are evaluated in a simulation study and applied to a data set on captures of the Mountain Pygmy Possum.     

洋葱内表皮细胞骨架的显示及部分性质研究

本文利用洋葱内表皮细胞作为实验材料，观察细胞骨架结构．实验结果显示植物细胞骨架呈网状结构，分布在整个细胞质中；幼嫩细胞的细胞骨架比较密集，吸附较多蛋白质，须经多次洗涤后才可获得较为清晰的图片．进一步的研究表明，与幼嫩细胞的细胞骨架相比，衰老细胞的细胞骨架出现部分解聚的现象；幼嫩细胞的细胞骨架在低温条件下亦出现解聚现象．使用洋葱内表皮观察细胞的骨架结构为我们在简便、经济的条件下，通过普通光学显微镜观察骨架提供了可能．这种方法为今后进一步开展细胞骨架的功能研究奠定了基础．     

Coming of age

Those of us who study aging have the unique opportunity to live their subject matter. Whether we learn any personal lessons is a matter of our own reflectivity, but personal experience can make us far better scholars than can scholarship alone. As one ponders the life course, it is clear that a number of institutional influences, temporal patterning, and unexpected intervening variables are involved in the unfolding of one's life. Life-long institutional memberships furnish social capital that helps establish parameters for our personal experience, for how we view our personal trajectories and for our ability to cope with the aging process itself. But how to come to terms with unexpected occurrences that alter the anticipated futures we had in mind? Do our scholarly efforts and our experience come together in ways that enrich one or the other? These are the questions I explore in this personal essay.     

中国医疗卫生行业发展影响因素的提炼与甄别

关于卫生行业发展影响因素的现有研究多数基于定性分析，而实证研究较少。为从静态和动态两个角度将经济社会发展对卫生行业发展的制约关系进行量化与应用研究，建立多元线性回归模型和ARMA（1，1）模型将社会经济因素对卫生行业发展的影响程度和影响方向进行提炼与甄别，结果表明：人均收入水平、财政卫生支出是影响中国卫生服务业发展的两个主要因素，城乡收入比和人口老龄化对卫生行业发展的影响还不是很显著。     

A new mixture model for capture heterogeneity

Summary.  We propose a mixture of binomial and beta–binomial distributions for estimating the size of closed populations. The new mixture model is applied to several real capture–recapture data sets and is shown to provide a convenient, objective framework for model selection. The new model is compared with three alternative models in a simulation study, and the results shed light on the general performance of models in this area. The new model provides a robust flexible analysis, which automatically deals with small capture probabilities.     

江苏省农村老年人医疗消费行为研究——以苏北农村地区为例

通过对老龄化程度较高的江苏省的实地调查,利用两部模型法对农村老年人医疗消费行为进行实证分析,结果表明,老年人口特有的生理特征和疾病模式决定了老年人群拥有更大的健康风险和更多的医疗消费需求,老年人的个人和家庭特征、经济状况、健康状况、疾病的严重程度、参加合作医疗的情况和医疗服务的质量等因素对农村老年人口医疗消费起着决定作用.     

The Use of Humor With Older Adults Aging in Place

As more older adults seek ways to remain in their homes during their “golden years,” humor has proven to be a worthwhile intervention that reduces stress and provides a hopeful, playful, and optimistic environment. Development of creative and supportive housing situations for older adults combined with the use of modern technology (e.g., the Internet and computer devices used in the home), aid in bringing humor to the older adult. This article addresses some of the challenges that older adults face and the way that the use of humor can assist them to meet these challenges.     

Older Lesbians and Work in the Australian Health and Aged Care Sector

While research has identified challenges lesbians face in the workplace, there is limited understanding of the particular experiences of older lesbians, especially those working in the health and aged care sector. This article draws on the stories of four women who participated in a narrative research project on lesbian and gay people's experiences of health and aged care. It highlights the need for future research to examine the complexity of identity expression and community affiliation, how people negotiate “coming out” in the workplace, the impact of discrimination, and the resources (such as friends) available to lesbians in the workplace.