211 research outputs found
Genetic Diversity of Four Filipino Negrito Populations from Luzon: Comparison of Male and Female Effective Population Sizes and Differential Integration of Immigrants into Aeta and Agta Communities
Genetic data corresponding to four negrito populations (two Aeta and two Agta; n = 120) from the Luzon region of the Philippines have been analyzed. These data comprise mitochondrial DNA (mtDNA) hypervariable segment 1 haplotypes and haplogroups, Y-chromosome haplogroups and short tandem repeats (STRs), autosomal STRs, and X-chromosome STRs. The genetic diversity and structure of the populations were investigated at a local, regional, and interregional level. We found a high level of autosomal differentiation, combined with no significant reduction in diversity, consistent with long-term settlement of the Luzon region by the ancestors of the Agta and Aeta followed by reduced gene flow between these two ethnolinguistic groups. Collectively, the Aeta have a much higher ratio of female:male effective population size than do the Agta, a finding that supports phylogenetic analysis of their mtDNA and Y-chromosome haplogroups, which suggests different genetic sex-biased contributions from putative Austronesian source populations. We propose that factors of social organization that led to the reduction in Agta female effective population size may also be linked to the limited incorporation of female lineages associated with the settlement of the Philippines by Austronesian speakers; conversely, the reduction in Aeta male effective population size, relative to females, could be indicative of a limited incorporation of male lineages associated with this demographic process
Self-Care Among Social Workers Employed in Rural Settings: A Cross-Sectional Investigation
Despite growing recognition about the importance of self-care for social work professionals, research related to the topic has not kept pace with the changing landscape of the profession. Particularly, self-care practices among rural social work professionals have been overlooked in the research. Rural social work practice is, in many ways, decidedly different from practice in more urban areas. Thus, the primary aim of this exploratory study was to investigate the personal and professional self-care practices of rural social workers. Specifically, the study sough to better understand how often social workers engage in self-care and whether or not there are associations between personal and professional demographic variables and self-care practice. Discussion and next-steps for research and implications for practice are included
Self-Care Among Social Workers Employed in Rural Settings: A Cross-Sectional Investigation
Despite growing recognition about the importance of self-care for social work professionals, research related to the topic has not kept pace with the changing landscape of the profession. Particularly, self-care practices among rural social work professionals have been overlooked in the research. Rural social work practice is, in many ways, decidedly different from practice in more urban areas. Thus, the primary aim of this exploratory study was to investigate the personal and professional self-care practices of rural social workers. Specifically, the study sough to better understand how often social workers engage in self-care and whether or not there are associations between personal and professional demographic variables and self-care practice. Discussion and next-steps for research and implications for practice are included
Self-Care among Social Workers Employed in Rural Settings: A Cross-Sectional Investigation
Despite growing recognition about the importance of self-care for social work professionals, research related to the topic has not kept pace with the changing landscape of the profession. Particularly, self-care practices among rural social work professionals have been overlooked in the research. Rural social work practice is, in many ways, decidedly different from practice in more urban areas. Thus, the primary aim of this exploratory study was to investigate the personal and professional self-care practices of rural social workers. Specifically, the study sough to better understand how often social workers engage in self-care and whether or not there are associations between personal and professional demographic variables and self-care practice. Discussion and next-steps for research and implications for practice are included
Approximating Turaev-Viro 3-manifold invariants is universal for quantum computation
The Turaev-Viro invariants are scalar topological invariants of compact,
orientable 3-manifolds. We give a quantum algorithm for additively
approximating Turaev-Viro invariants of a manifold presented by a Heegaard
splitting. The algorithm is motivated by the relationship between topological
quantum computers and (2+1)-D topological quantum field theories. Its accuracy
is shown to be nontrivial, as the same algorithm, after efficient classical
preprocessing, can solve any problem efficiently decidable by a quantum
computer. Thus approximating certain Turaev-Viro invariants of manifolds
presented by Heegaard splittings is a universal problem for quantum
computation. This establishes a novel relation between the task of
distinguishing non-homeomorphic 3-manifolds and the power of a general quantum
computer.Comment: 4 pages, 3 figure
Risk and Protective Factors of Dementia Among Adults With Post-Traumatic Stress Disorder: A Systematic Review Protocol
INTRODUCTION: Post-traumatic stress disorder (PTSD) is associated with an increased risk of dementia. Individual epidemiological studies have controlled for several confounders of the relationship between PTSD and increased dementia risk, yet particular risk factors underlying this relationship have not been determined. This systematic review protocol aims to identify risk and protective factors of dementia among adults with PTSD.
METHODS AND ANALYSIS: We will conduct an electronic search of the databases: PubMed, CINAHL, PsychINFO, The Cochrane Library, Scopus and ProQuest Dissertation and Theses Global. After screening the studies, quantitative synthesis will be performed, if possible. Otherwise, a narrative synthesis will be performed. We will include randomised controlled trials and other types of research evidence including longitudinal cohort studies. Strength of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations method. Examples of variables that will be extracted are: year of PTSD diagnosis, comorbid conditions, health behaviours, pharmacological treatments and year of mild cognitive impairment or dementia diagnosis. We developed this systematic review protocol according to the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols 2015 statement.
ETHICS AND DISSEMINATION: The proposed study will not collect individual-level data and, therefore, does not require ethical approval. Results of this study will provide current evidence on risk and protective factors of dementia in adults with PTSD. Findings will be disseminated in peer-reviewed publications and conference presentations.
PROSPERO REGISTRATION NUMBER: CRD42019128553
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Concrete containment aging study
In 1989, IAEA initiated a pilot study on the management of aging of nuclear power plant components. The Phase I and II studies of concrete containment are discussed. With the data base, plant owners will be able to review and enhance their existing programs. IAEA will analyze data provided by participating plants and the report is scheduled to be released by late 1994 (final report release mid-1995)
Observables in 3-dimensional quantum gravity and topological invariants
In this paper we report some results on the expectation values of a set of
observables introduced for 3-dimensional Riemannian quantum gravity with
positive cosmological constant, that is, observables in the Turaev-Viro model.
Instead of giving a formal description of the observables, we just formulate
the paper by examples. This means that we just show how an idea works with
particular cases and give a way to compute 'expectation values' in general by a
topological procedure.Comment: 24 pages, 47 figure
Crumpled triangulations and critical points in 4D simplicial quantum gravity
This is an expanded and revised version of our geometrical analysis of the
strong coupling phase of 4D simplicial quantum gravity. The main differences
with respect to the former version is a full discussion of singular
triangulations with singular vertices connected by a subsingular edge. In
particular we provide analytical arguments which characterize the entropical
properties of triangulations with a singular edge connecting two singular
vertices. The analytical estimate of the location of the critical coupling at
k_2\simeq 1.3093 is presented in more details. Finally we also provide a model
for pseudo-criticality at finite N_4(S^4).Comment: 44 page
Zooplankton as an indicator of the status of contamination of the Mediterranean Sea and temporal trends
Zooplankton has been intensively used as bioindicators of water pollution at global level, however, only few comprehensive studies have been conducted from the Mediterranean Sea and manly dated back to the 1970s. To redress the urgent need for updated data, this study provides information on the presence and levels of contaminants in zooplankton from the Tyrrhenian Sea. Although banned, both PCBs (46.9 +/- 37.2 ng g-1) and DDT (8.9 +/- 10.7 ng g-1) are still present and widespread, but their contamination appears to be a local problem and to be declining over the past 50 years. Zooplankton accumulates high levels of certain TEs, including Zn (400 +/- 388 ppm) and Pb (35.3 +/- 45.5 ppm), but shows intermediate concentrations of other TEs, including Cd (1.6 +/- 0.9 ppm) and Hg (0.1 +/- 0.1 ppm), comparing with both strongly polluted and more pristine marine habitats, which may reflect a general improvement
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