Living arrangements of older adults in sub-Saharan Africa in a time of HIV/AIDS

Journal ArticleThe detrimental consequences of the AIDS epidemic for older adults in sub-Saharan Africa suggest the need to investigate their characteristics, living situations, and well-being. In this study, we examine the living arrangements of persons aged 60 and older in 16 countries. Data come from the household roster component of recent Demographic and Health Surveys. The focus is on the tendency of the elderly to live with children and grandchildren, and we examine distributions and determinants. Results show that older adults in sub-Saharan Africa live in a variety of household arrangements. Men are more likely to be living in a nuclear household, while women are more likely to be living in extended families. Regressions show that determinants of living with children and grandchildren differ by sex. Taking advantage of survey items on the survival and whereabouts of parents of children, we also examine whether older adults living with grandchildren are involved in fostering or orphaning situations. Those living in countries characterized by high levels of AIDS-related mortality are more likely to be living with grandchildren, with grandchildren but no children in the household, and with orphaned grandchildren. The percent living with one or more double-orphaned grandchildren is strongly associated with AIDS-related mortality, suggesting that the epidemic may be having adverse influences on the living situations of older adults. Knowing about the types of households in which older people live is a first step to understanding their needs in a part of the world with limited resources

Family size and support of older adults in urban and rural China: current effects and future implications

Journal ArticleChina will experience rapid growth in the proportion and number of older people in its population in the near future as a consequence of an extraordinarily rapid decline in fertility over the past several decades. Total fertility rates were as high as 7.5 in the early 1950s, but have fallen to below replacement level in recent years, with the sharpest declines occurring in the late 1970s and early 1980s, around the time that China began implementing its one-child policy (Liu 1988; Poston 1992; T.H. Yuan et al. 1992). The aging of China has also been influenced by a decline in infant mortality during and after the 1950s, which increased survivorship among a "baby-boom" cohort, who were subsequently the first to experience a rapid decline in fertility and the one-child policy (Zhenghua and Lingguang 2000). Thus, China now has a large cohort of adults who are in or nearing the end of their childbearing ages and are experiencing much lower birth rates than did their predecessors. This next generation of elderly persons will make up more than 20% of China's total population and will put the proportion of older adults in China on par with or surpassing that in Western developed countries

Effectiveness of a new non-hydrogen peroxide bleaching agent after single use - a double-blind placebo-controlled short-term study

Tooth whitening represents perhaps the most common aesthetic procedure in dentistry worldwide. The efficacy of bleaching depends on three aspects: bleaching agent, bleaching method, and tooth color. Objective: This in vivo study aimed to examine whitening effects on frontal teeth of the upper and lower jaws using an over-the-counter (OTC) non-hydrogen peroxide bleaching agent in comparison to a placebo after one single use. Material and methods: Forty subjects (25 female; 15 male) participated in this double-blind randomized placebo-controlled trial. The subjects were randomly allocated to two groups (n=20). The test group received the OTC product (iWhite Instant) and the placebo group received an identically composed product except for the active agents. Each subject was treated with a prefilled tray containing iWhite Instant or the placebo for 20 minutes. The tooth shade of the front teeth (upper and lower jaws) was assessed before (E_0), immediately after (E_1) and 24 h after treatment (E_2), using a shade guide (VITA classical). Statistical testing was accomplished using the Mann-Whitney U test (

The living arrangements of older adults in sub-Saharan Africa in a time of HIV/AIDS

The detrimental consequences of the AIDS epidemic for older adults in sub-Saharan Africa suggest the need to investigate their characteristics, living situations, and well-being. In this study, we examine the living arrangements of persons aged 60 and older in 16 countries. Data come from the household roster component of recent Demographic and Health Surveys. The focus is on the tendency of the elderly to live with children and grandchildren, and we examine distributions and determinants. Results show that older adults in sub-Saharan Africa live in a variety of household arrangements. Men are more likely to be living in a nuclear household, while women are more likely to be living in extended families. Regressions show that determinants of living with children and grandchildren differ by sex. Taking advantage of survey items on the survival and whereabouts of parents of children, we also examine whether older adults living with grandchildren are involved in fostering or orphaning situations. Those living in countries characterized by high levels of AIDS-related mortality are more likely to be living with grandchildren, with grandchildren but no children in the household, and with orphaned grandchildren. The percent living with one or more double-orphaned grandchildren is strongly associated with AIDS-related mortality, suggesting that the epidemic may be having adverse influences on the living situations of older adults. Knowing about the types of households in which older people live is a first step to understanding their needs in a part of the world with limited resources

AtrialGeneral: Domain Generalization for Left Atrial Segmentation of Multi-Center LGE MRIs

Left atrial (LA) segmentation from late gadolinium enhanced magnetic resonance imaging (LGE MRI) is a crucial step needed for planning the treatment of atrial fibrillation. However, automatic LA segmentation from LGE MRI is still challenging, due to the poor image quality, high variability in LA shapes, and unclear LA boundary. Though deep learning-based methods can provide promising LA segmentation results, they often generalize poorly to unseen domains, such as data from different scanners and/or sites. In this work, we collect 210 LGE MRIs from different centers with different levels of image quality. To evaluate the domain generalization ability of models on the LA segmentation task, we employ four commonly used semantic segmentation networks for the LA segmentation from multi-center LGE MRIs. Besides, we investigate three domain generalization strategies, i.e., histogram matching, mutual information based disentangled representation, and random style transfer, where a simple histogram matching is proved to be most effective.Comment: 10 pages, 4 figures, MICCAI202

Medical Image Analysis on Left Atrial LGE MRI for Atrial Fibrillation Studies: A Review

Late gadolinium enhancement magnetic resonance imaging (LGE MRI) is commonly used to visualize and quantify left atrial (LA) scars. The position and extent of scars provide important information of the pathophysiology and progression of atrial fibrillation (AF). Hence, LA scar segmentation and quantification from LGE MRI can be useful in computer-assisted diagnosis and treatment stratification of AF patients. Since manual delineation can be time-consuming and subject to intra- and inter-expert variability, automating this computing is highly desired, which nevertheless is still challenging and under-researched. This paper aims to provide a systematic review on computing methods for LA cavity, wall, scar and ablation gap segmentation and quantification from LGE MRI, and the related literature for AF studies. Specifically, we first summarize AF-related imaging techniques, particularly LGE MRI. Then, we review the methodologies of the four computing tasks in detail, and summarize the validation strategies applied in each task. Finally, the possible future developments are outlined, with a brief survey on the potential clinical applications of the aforementioned methods. The review shows that the research into this topic is still in early stages. Although several methods have been proposed, especially for LA segmentation, there is still large scope for further algorithmic developments due to performance issues related to the high variability of enhancement appearance and differences in image acquisition.Comment: 23 page

Decay dynamics of excitonic polarons in InAs/GaAs quantum dots

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics 110, 074303 (2011) and may be found at https://doi.org/10.1063/1.3639310.We present time-resolved studies of the exciton-phonon interaction in self-assembled InAs/GaAs quantum dots. Different scattering and luminescence processes were investigated by time-resolved spectroscopy exciting resonantly into the quantum dot’s electronic structure. By studying the characteristic decay times of the ground state and of several phonon-assisted recombinations we were able to distinguish a resonant Raman process from a phonon-assisted photoluminescence process which are always simultaneously present and can interfere with each other. While lifetimes under 30 ps were observed for the coherent Raman process, the incoherent phonon-assisted recombination exhibited typical lifetimes of around 1 ns independently of the excitation energy. We conclude that under resonant excitation the dominant radiative recombination process in this system always involves an electronic state of the ground state of the quantum dot’s electronic structure. Combining temperature-dependent and time-resolved measurements we show that a weak phonon-bottleneck is present in the low temperature regime (< 130 K), while it disappears for higher temperatures.DFG, 43659573, SFB 787: Halbleiter - Nanophotonik: Materialien, Modelle, BauelementeDFG, 53182490, EXC 314: Unifying Concepts in Catalysi

Reviewing the focus: a summary and critique of child-focused sexual abuse prevention

Due to the high incidence, and widespread detrimental health consequences, of child sexual abuse (CSA), effective prevention remains at the forefront of public and mental health research, prevention and intervention agendas. To date much of the focus of prevention has been on school-based education programs designed to teach children skills to evade adult sexual advances, and disclose past or ongoing abuse. Evaluation of sexual abuse prevention programs demonstrate their effectiveness in increasing children’s knowledge of CSA concepts and protection skills, but little is known about their effects on children’s capacity to prevent abuse. Moreover, concerns persist about the unintended side-effects for young children such as anxiety, worry and wariness of touch. This paper summarizes the recent history of CSA prevention and the critique of child-focused protection programs in order to demonstrate the need to compliment or replace these programs by focusing more on protectors in the children’s ecology, specifically parents, in order to create safer environments in which abuse is less likely to occur

Parent relationships and adolescents' depression and social anxiety: indirect associations via emotional sensitivity to rejection threat

One prominent theory has proposed that rejection and other negative parenting practices prompt children's emotional sensitivity to the threat of rejection, often referred to as rejection sensitivity (RS). This emotional sensitivity is thought to result in social and emotional maladjustment. In the present study, we tested this model of parenting, emotional sensitivity, and maladjustment with 659 early adolescents (aged 9–13 years). The findings confirmed that adolescents who reported more negative parenting practices had elevated depression and social anxiety symptoms, heightened levels of RS, and more elevated sadness and withdrawal responses to rejection threat. In a final structural equation model, RS and withdrawal were uniquely associated with depressive symptoms, and RS, sadness, and withdrawal were uniquely associated with social anxiety. Moreover, negative parenting had significant associations with symptoms both directly and indirectly via RS, sadness, and/or withdrawal, with the effects mostly direct for depressive symptoms and mostly indirect for social anxiety symptoms. Interparental conflict was also implicated in adolescents' RS, reactions to rejection threat, and symptoms, but these correlational effects were almost entirely indirect via parenting practices. An alternate model of depression and anxiety predicting sensitivity to rejection threat was tested and found to be equally viable. The findings provide a more nuanced understanding of the links between rejection and adolescent emotional adjustment