Human genetic history in East Asia is poorly understood. To clarify population relationships, we obtained genome wide data from 26 ancient individuals from northern and southern East Asia spanning 9,500-300 years ago. Genetic differentiation was higher in the past than the present, reflecting a major episode of admixture involving northern East Asian ancestry spreading across southern East Asia after the Neolithic, transforming the genetic ancestry of southern China. Mainland southern East Asian and Taiwan Strait island samples from the Neolithic show clear connections with modern and ancient samples with Austronesian-related ancestry, supporting a southern China origin for proto-Austronesians. Connections among Neolithic coastal groups from Siberia and Japan to Vietnam indicate that migration and gene flow played an important role in the prehistory of coastal Asia.

The identity of the earliest inhabitants of Xinjiang, in the heart of Inner Asia, and the languages that they spoke have long been debated and remain contentious1. Here we present genomic data from 5 individuals dating to around 3000–2800 bc from the Dzungarian Basin and 13 individuals dating to around 2100–1700 bc from the Tarim Basin, representing the earliest yet discovered human remains from North and South Xinjiang, respectively. We find that the Early Bronze Age Dzungarian individuals exhibit a predominantly Afanasievo ancestry with an additional local contribution, and the Early–Middle Bronze Age Tarim individuals contain only a local ancestry. The Tarim individuals from the site of Xiaohe further exhibit strong evidence of milk proteins in their dental calculus, indicating a reliance on dairy pastoralism at the site since its founding. Our results do not support previous hypotheses for the origin of the Tarim mummies, who were argued to be Proto-Tocharian-speaking pastoralists descended from the Afanasievo1,2 or to have originated among the Bactria–Margiana Archaeological Complex3 or Inner Asian Mountain Corridor cultures4. Instead, although Tocharian may have been plausibly introduced to the Dzungarian Basin by Afanasievo migrants during the Early Bronze Age, we find that the earliest Tarim Basin cultures appear to have arisen from a genetically isolated local population that adopted neighbouring pastoralist and agriculturalist practices, which allowed them to settle and thrive along the shifting riverine oases of the Taklamakan Desert.

Demographic shifts in China pose unprecedented challenges in the care of a rapidly growing older population. Sporadic reports suggest the recent emergence of institutional elder care in China, but little is currently known about this phenomenon. This study documents the growth, ownership, financing, staffing, and resident characteristics of elder care institutions using survey data collected in 2009 from Nanjing, China, supplemented with government registry data from seven additional major Chinese cities. Between one-half and two-thirds of facilities operating in these cities were founded in the last decade, primarily in the non-government sector. In Nanjing, government ownership dominated homes built before 1990 (96%) but was increasingly rare in the 1990s (60%) and in the 2000s (23%), a pattern observed in the other seven cities as well. In Nanjing, the average home now draws more than 80% of its daily operating revenues from private-pay or other non-government sources, and this share increases sharply with the recency of facility establishment. The majority (85%) of non-government-owned homes are receiving ongoing per-bed subsidies from the government. The lack of clinical staff characterizes the majority of study facilities; most care staff are rural migratory workers. There is considerable variability across facilities in the case-mix of residents in terms of functional dependence and acuity levels. These findings portray the emergence and rapid growth of a nascent industry of institutional long-term care in urban China and a fundamental shift in institutional ownership, financing, and clientele.

No abstract

No abstract

The authors examined changing attitudes about filial piety, or xiao, using data from intensive interviews with 20 elderly residents, 14 family members, and 9 staff members in Nanjing, China. The findings reveal that respondents interpreted the notion of xiao in terms of their own social worlds and on the basis of their own social locations and contexts. The increasing unavailability of adult children, various benefits of institutional care, and children's financial assistance for older parents are major explanations for xiao behaviors, even when elders are placed in institutions. The high cost of professional care in institutions is contributing to a shift in attitudes about institutional elder care from stigma to privilege. The authors argue that China can expect an increasing need and demand for elder care institutions as a large number of Chinese baby boomers retire.

Findings from a prospective study of project-induced migration in China's Three Gorges Dam project are reported. The study tests the hypotheses that anticipation of involuntary migration is stressful and that the harmful effects are partially mediated and moderated by the resources migrants possess. Using data collected from a sample of designated migrants (n = 975) who will be forced to relocate because they live in an area which will be flooded once the Three Gorges project is completed, and non-migrants (n = 555) in the same region, our analysis indicates that anticipation of involuntary migration is a robust predictor of mental distress. Anticipation of forced migration elevates depression (CES-D) not only directly, but also indirectly by weakening the social and the psychological resources (i.e., social support and mastery) which safeguard the mental well-being of migrants. However, our results show much less support for the hypothesis that resources moderate harmful effects of forced migration. KeywordsChina; Three Gorges; Development; Involuntary migration; Stress Main textMoving has often been seen as a stressful life event because it disturbs the equilibrium between the mover and the environment and compels the mover to readjust (Ben-Sira, 1997;Bhugra, 2004;Lev-Wiesel, 1998). While this view has been proven useful to explain the prevalence ofCorresponding Author E-Mail: shwang@uab.edu. 2 Although sample size may have played a role in these tests, we believe the effect of the variable is robust using even the most rigid definition of robustness.Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers

Quantum memories are essential for quantum information processing. Techniques have been developed for quantum memory based on atomic ensembles. The atomic memories through optical resonance usually suffer from the narrow-band limitation. The far off-resonant Raman process is a promising candidate for atomic memories due to broad bandwidths and high speeds. However, to date, the low memory efficiency remains an unsolved bottleneck. Here, we demonstrate a high-performance atomic Raman memory in 87Rb vapour with the development of an optimal control technique. A memory efficiency of above 82.0% for 6 ns~20 ns optical pulses is achieved. In particular, an unconditional fidelity of up to 98.0%, significantly exceeding the no-cloning limit, is obtained with the tomography reconstruction for a single-photon level coherent input. Our work marks an important advance of atomic memory towards practical applications in quantum information processing.