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https://www.readbyqxmd.com/read/28731295/biogeochemistry-of-lead-its-release-to-the-environment-and-chemical-speciation
#1
Jay T Cullen, Jason McAlister
Lead (Pb) is a metal that is not essential for life processes and proves acutely toxic to most organisms. Compared to other metals Pb is rather immobile in the environment but still its biogeochemical cycling is greatly perturbed by human activities. In this review we present a summary of information describing the physical and chemical properties of Pb, its distribution in crustal materials, and the processes, both natural and anthropogenic, that contribute to the metal's mobilization in the biosphere. The relatively high volatility of Pb metal, low melting point, its large ionic radius, and its chemical speciation in aquatic systems contributes to its redistribution by anthropogenic and natural processes...
April 10, 2017: Metal Ions in Life Sciences
https://www.readbyqxmd.com/read/28727727/a-comparative-study-of-patients-activities-and-interactions-in-a-stroke-unit-before-and-after-reconstruction-the-significance-of-the-built-environment
#2
Anna Anåker, Lena von Koch, Christina Sjöstrand, Julie Bernhardt, Marie Elf
Early mobilization and rehabilitation, multidisciplinary stroke expertise and comprehensive therapies are fundamental in a stroke unit. To achieve effective and safe stroke care, the physical environment in modern stroke units should facilitate the delivery of evidence-based care. Therefore, the purpose of this study was to explore patients' activities and interactions in a stroke unit before the reconstruction of the physical environment, while in a temporary location and after reconstruction. This case study examined a stroke unit as an integrated whole...
2017: PloS One
https://www.readbyqxmd.com/read/28724714/sedentary-time-in-older-adults-a-critical-review-of-measurement-associations-with-health-and-interventions
#3
REVIEW
Jennifer L Copeland, Maureen C Ashe, Stuart Jh Biddle, Wendy J Brown, Matthew P Buman, Sebastien Chastin, Paul A Gardiner, Shigeru Inoue, Barbara J Jefferis, Koichiro Oka, Neville Owen, Luís B Sardinha, Dawn A Skelton, Takemi Sugiyama, Shilpa Dogra
Sedentary time (ST) is an important risk factor for a variety of health outcomes in older adults. Consensus is needed on future research directions so that collaborative and timely efforts can be made globally to address this modifiable risk factor. In this review, we examined current literature to identify gaps and inform future research priorities on ST and healthy ageing. We reviewed three primary topics:(1) the validity/reliability of self-report measurement tools, (2) the consequences of prolonged ST on geriatric-relevant health outcomes (physical function, cognitive function, mental health, incontinence and quality of life) and(3) the effectiveness of interventions to reduce ST in older adults...
July 19, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28724452/exercise-energy-expenditure-and-energy-balance-as-measured-with-doubly-labelled-water
#4
Klaas R Westerterp
The doubly labelled water method for the measurement of total daily energy expenditure (TDEE) over 1-3 weeks under daily living conditions is the indicated method to study effects of exercise and extreme environments on energy balance. Subjects consume a measured amount of doubly labelled water (2H2 18O) to increase background enrichment of body water for 18O and 2H, and the subsequent difference in elimination rate between 18O and 2H, as measured in urine, saliva or blood samples, is a measure for carbon dioxide production and thus allows calculation of TDEE...
July 20, 2017: Proceedings of the Nutrition Society
https://www.readbyqxmd.com/read/28724371/association-between-full-service-and-fast-food-restaurant-density-dietary-intake-and-overweight-obesity-among-adults-in-delhi-india
#5
Opal Patel, Safraj Shahulhameed, Roopa Shivashankar, Mohammad Tayyab, Atiqur Rahman, Dorairaj Prabhakaran, Nikhil Tandon, Lindsay M Jaacks
BACKGROUND: The food environment has been implicated as an underlying contributor to the global obesity epidemic. However, few studies have evaluated the relationship between the food environment, dietary intake, and overweight/obesity in low- and middle-income countries (LMICs). The aim of this study was to assess the association of full service and fast food restaurant density with dietary intake and overweight/obesity in Delhi, India. METHODS: Data are from a cross-sectional, population-based study conducted in Delhi...
July 19, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28723273/the-repair-project-examining-the-biological-impacts-of-sub-background-radiation-exposure-within-snolab-a-deep-underground-laboratory
#6
Christopher Thome, Sujeenthar Tharmalingam, Jake Pirkkanen, Andrew Zarnke, Taylor Laframboise, Douglas R Boreham
Considerable attention has been given to understanding the biological effects of low-dose ionizing radiation exposure at levels slightly above background. However, relatively few studies have been performed to examine the inverse, where natural background radiation is removed. The limited available data suggest that organisms exposed to sub-background radiation environments undergo reduced growth and an impaired capacity to repair genetic damage. Shielding from background radiation is inherently difficult due to high-energy cosmic radiation...
July 19, 2017: Radiation Research
https://www.readbyqxmd.com/read/28721495/diversity-and-survival-of-artificial-lifeforms-under-sedimentation-and-random-motion
#7
Nicolas Glade, Olivier Bastien, Pascal Ballet
Cellular automata are often used to explore the numerous possible scenarios of what could have occurred at the origins of life and before, during the prebiotic ages, when very simple molecules started to assemble and organise into larger catalytic or informative structures, or to simulate ecosystems. Artificial self-maintained spatial structures emerge in cellular automata and are often used to represent molecules or living organisms. They converge generally towards homogeneous stationary soups of still-life creatures...
July 18, 2017: Theory in Biosciences, Theorie in Den Biowissenschaften
https://www.readbyqxmd.com/read/28719577/physical-limits-to-biomechanical-sensing-in-disordered-fibre-networks
#8
Farzan Beroz, Louise M Jawerth, Stefan Münster, David A Weitz, Chase P Broedersz, Ned S Wingreen
Cells actively probe and respond to the stiffness of their surroundings. Since mechanosensory cells in connective tissue are surrounded by a disordered network of biopolymers, their in vivo mechanical environment can be extremely heterogeneous. Here we investigate how this heterogeneity impacts mechanosensing by modelling the cell as an idealized local stiffness sensor inside a disordered fibre network. For all types of networks we study, including experimentally-imaged collagen and fibrin architectures, we find that measurements applied at different points yield a strikingly broad range of local stiffnesses, spanning roughly two decades...
July 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28719225/association-between-social-support-and-self-care-behaviors-in-adults-with-chronic-obstructive-pulmonary-disease
#9
Zijing Chen, Vincent S Fan, Basia Belza, Kenneth Pike, Huong Q Nguyen
RATIONALE: Higher social support is associated with a better quality of life and functioning in adults with chronic obstructive pulmonary disease (COPD). OBJECTIVES: To determine the association between structural and functional social support and self-care behaviors in adults with COPD. METHODS: This was a longitudinal study using data from the CASCADE (COPD Activity: Serotonin Transporter, Cytokines, and Depression) study which was focused on depression and functioning in COPD...
July 18, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28718941/child-understandings-of-the-causation-of-childhood-burn-injuries-child-activity-parental-domestic-demands-and-impoverished-settings
#10
N Titi, A van Niekerk, R Ahmed
BACKGROUND: Burns are a global public health problem. In South Africa, the rate of paediatric burn deaths is 5 times higher than other upper middle-income countries, with concentrations in impoverished settings. Globally, the majority of research focuses on expert and caregiver descriptions of burn occurrence, causation, and prevention, with limited consideration of children's perspectives. This study investigated children's understanding of the causation and prevention of childhood burns...
July 18, 2017: Child: Care, Health and Development
https://www.readbyqxmd.com/read/28718621/illuminating-the-cell-s-biochemical-activity-architecture
#11
Sohum Mehta, Jin Zhang
All cellular behaviors arise through the coordinated actions of numerous intracellular biochemical pathways. Over the past twenty years, efforts to probe intracellular biochemical processes have undergone a fundamental transformation brought about by advances in fluorescence imaging, such as the development of genetically encoded fluorescent reporters and new imaging technologies; the impact of these approaches on our understanding of the molecular underpinnings of biological function cannot be understated...
July 18, 2017: Biochemistry
https://www.readbyqxmd.com/read/28717827/individual-and-environmental-correlates-of-objectively-measured-physical-activity-and-sedentary-time-in-adults-from-curitiba-brazil
#12
Priscila Bezerra Gonçalves, Pedro Curi Hallal, Adriano Akira Ferreira Hino, Rodrigo Siqueira Reis
OBJECTIVES: This study assessed the association of individual and neighborhood environment characteristics and objectively measured physical activity (PA) and sedentary time (ST) in adults from Curitiba, Brazil. METHODS: A population-based cross-sectional study was conducted through face-to-face household interviews in 2010. The analytic sample included 305 adults aged 20-65 years recruited from 32 census tracts selected according to neighborhood walkability and socioeconomic status...
July 17, 2017: International Journal of Public Health
https://www.readbyqxmd.com/read/28717024/inorganic-carbon-availability-in-benthic-diatom-communities-photosynthesis-and-migration
#13
REVIEW
Jorge Marques da Silva, Sónia Cruz, Paulo Cartaxana
Diatom-dominated microphytobenthos (MPB) is the main primary producer of many intertidal and shallow subtidal environments, being therefore of critical importance to estuarine and coastal food webs. Owing to tidal cycles, intertidal MPB diatoms are subjected to environmental conditions far more variable than the ones experienced by pelagic diatoms (e.g. light, temperature, salinity, desiccation and nutrient availability). Nevertheless, benthic diatoms evolved adaptation mechanisms to these harsh conditions, including the capacity to move within steep physical and chemical gradients, allowing them to perform photosynthesis efficiently...
September 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28712165/effectiveness-of-a-school-based-multicomponent-intervention-on-nutritional-status-among-primary-school-children-in-bangkok-thailand
#14
Nattapon Chawla, Alessio Panza, Chutima Sirikulchayanonta, Ramesh Kumar, Surasak Taneepanichskul
BACKGROUND: Childhood obesity has become a major public health issue today. The prevalence of obesity and overweight is increasing in both adults and children. Childhood obesity in Thailand has more than doubled since the 1960s and a recent study reported that overweight and obesity in Thais is the 5th highest in Asia. The present study objective was to evaluate the effectiveness of a life-skills, multicomponent, school-based intervention on child nutritional status. METHODS: A quasi-experimental design was conducted in two-groups (control and intervention schools) on 453 students attending grade levels 4-5 in Bangkok...
January 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28710484/colored-and-fluorescent-nanofibrous-silk-as-a-physically-transient-chemosensor-and-vitamin-deliverer
#15
Kyungtaek Min, Sookyoung Kim, Chang Gun Kim, Sunghwan Kim
Biodegradable and physically transient optics represent an emerging paradigm in healthcare devices by harnessing optically active system and obviating issues with chronic uses. Light emitting components that can efficiently interact with their environments have advantages of high sensitivity, visibility, and wireless operation. Here, we report a novel combination of silk biopolymer and optically active organic dyes resulting in versatile fluorescent silk nanofibers (FSNs). FSNs generated by the electrospinning method exhibit attractive functions of the doped organic dyes along with programming the system that physically disappear at prescribed time...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709856/developing-smartphone-apps-for-behavioural-studies-the-alcorisk-app-case-study
#16
Anthony Smith, Kristy de Salas, Ian Lewis, Benjamin Schüz
Advances in mobile technology and significantly increasing utilization of mobile devices such as smartphones and tablets have resulted in a paradigm shift from PC-centric computing to mobile computing. The results of careful analysis conducted of this mobile landscape indicate that there is a growing demand for smart, user-centric, situation-aware mobile software. Invariably, concomitant with this demand is the need for methodologies that can provide support the development of this type of software. In this paper, we propose a semantic framework, called the mobile situation-aware framework, which supports efficient modeling, construction, processing, management, and inference of mobile situation information...
July 11, 2017: Journal of Biomedical Informatics
https://www.readbyqxmd.com/read/28709032/children-and-youth-s-biopsychosocial-wellbeing-in-the-context-of-energy-resource-activities
#17
REVIEW
Robin S Cox, Pamela Irwin, Leila Scannell, Michael Ungar, Trevor Dixon Bennett
BACKGROUND: Children and youth emerge as key populations that are impacted by energy resource activities, in part because of their developmental vulnerabilities, as well as the compounding effects of energy systems on their families, communities, and physical environments. While there is a larger literature focused on fossil fuel emissions and children, the impacts of many aspects of energy systems on children and youth remain under examined and scattered throughout the health, social science, and environmental science literatures...
July 11, 2017: Environmental Research
https://www.readbyqxmd.com/read/28708245/health-equity-issues-related-to-childhood-obesity-a-scoping-review
#18
Clemencia M Vargas, Elsie M Stines, Herta S Granado
PURPOSE: The purpose of this scoping review was to determine the health-equity issues that relate to childhood obesity. METHODS: Health-equity issues related to childhood obesity were identified by analyzing food environment, natural and built environment, and social environment. The authors searched Medline, PubMed, and Web of Science, using the keywords "children" and "obesity." Specific terms for each environment were added: "food desert," "advertising," "insecurity," "price," "processing," "trade," and "school" for food environment; "urban design," "land use," "transportation mode," "public facilities," and "market access" for natural and built environment; and "financial capacity/poverty," "living conditions," "transport access," "remoteness," "social support," "social cohesion," "working practices," "eating habits," "time," and "social norms" for social environment...
July 14, 2017: Journal of Public Health Dentistry
https://www.readbyqxmd.com/read/28707547/-we-need-a-safe-walkable-way-to-connect-our-sisters-and-brothers-a-qualitative-study-of-opportunities-and-challenges-for-neighborhood-based-physical-activity-among-residents-of-low-income-african-american-communities
#19
Stephanie T Child, Andrew T Kaczynski, Melissa L Fair, Ellen W Stowe, S Morgan Hughey, Lauren Boeckerman, Sally Wills, Yvonne Reeder
OBJECTIVE: The purpose of this study was to explore perceptions of the benefits of and influencing factors for neighborhood-based physical activity (PA), and elicit suggestions for increasing neighborhood-based PA among primarily Black residents living in lower income neighborhoods. DESIGN: Eight focus groups were conducted in low-income, predominantly Black neighborhoods (n = 8) in Greenville, SC during Spring 2014. Using a semi-structured focus group guide with open-ended questions, residents were asked to describe benefits of PA, neighborhood factors associated with PA, and ways to increase PA within their neighborhoods...
July 14, 2017: Ethnicity & Health
https://www.readbyqxmd.com/read/28707412/differences-in-the-daily-activity-of-patients-with-diabetic-foot-ulcers-compared-to-controls-in-their-free-living-environments
#20
Helen Sheahan, Kimberley Canning, Nishka Refausse, Ewan M Kinnear, Greg Jorgensen, James R Walsh, Peter A Lazzarini
The aims of our study were to investigate multiple daily activity outcomes in patients with diabetic foot ulcers (DFU) compared to diabetic peripheral neuropathy (DPN) and diabetes (DM) controls in their free-living environments. We examined daily activity outcomes of 30 patients with DFU, 23 DPN and 20 DM. All patients wore a validated multi-sensor device for > 5 days (>22 hours per day) to measure their daily activity outcomes: steps, energy expenditure (kJ), average metabolic equivalent tasks (METs), physical activity (>3·0 METs) duration and energy expenditure, lying duration, sleep duration and sleep quality...
July 13, 2017: International Wound Journal
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