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https://www.readbyqxmd.com/read/29051936/nio-nanoflakes-grafted-graphene-an-excellent-photocatalyst-and-a-novel-nanomaterial-for-achieving-complete-pathogen-control
#1
A Arshad, J Iqbal, Q Mansoor
The increased levels of industrial pollutants in water and of drug-resistant pathogens more generally are a serious threat to human and aquatic life. Herein, we present the solar-light-induced dye removal and bactericidal properties of nickel oxide (NiO) and graphene nanoplatelet (GNP) nanocomposites. The conducting nature of GNPs is the key factor that accounts for the enhanced photocatalytic and antibacterial activity. Remarkably, the graphene/NiO nanocomposite shows outstanding photocatalytic activity (99% degradation) as compared to NiO (34%) alone, which makes it a potential candidate for the depollution of dye-contaminated water...
October 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/29051846/enhanced-biodegradation-of-mixed-pahs-by-mutated-naphthalene-1-2-dioxygenase-encoded-by-pseudomonas-putida-strain-kd6-isolated-from-petroleum-refinery-waste
#2
Kunal Dutta, Sergey Shityakov, Prangya P Das, Chandradipa Ghosh
Polycyclic aromatic hydrocarbons (PAHs) are a group of environmental pollutant that are given top priority to maintain water and soil quality to the most amenable standard. Biodegradation of PAHs by bacteria is the convenient option for decontamination on site or off site. The aim of the present study was to isolate and identify naturally occurring bacteria having mixed PAHs biodegradation ability. The newly isolated Pseudomonas putida strain KD6 was found to efficiently degrade 97.729% of 1500 mg L(-1) mixed PAHs within 12 days in carbon-deficient minimal medium (CSM)...
December 2017: 3 Biotech
https://www.readbyqxmd.com/read/29051101/molecular-characterization-and-bioinformatics-studies-of-a-lipase-from-bacillus-thermoamylovorans-bhk67
#3
Abhishek Sharma, Khem Raj Meena, Shamsher S Kanwar
A bacterium isolated from a hot-water spring identified as Bacillus thermoamylovorans BHK67 successfully produced a thermotolerant extracellular alkaliphilic lipase. The lipase was purified to homogeneity by anion exchange chromatography with 15-fold purification and 12.1% yield. The lipase appeared to be a hexameric protein as it possessed a single band of Mr 25kDa in SDS PAGE and150kDa in Native PAGE. DLS analysis of purified Bacillus thermoamylovorans BHK67 lipase (BTL) also showed the molecular integrity, homogeneity and stability of the enzyme...
October 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29050554/natural-variation-and-genetics-of-photoperiodism-in-wyeomyia-smithii
#4
William E Bradshaw, Christina M Holzapfel
Seasonal change in the temperate and polar regions of Earth determines how the world looks around us and, in fact, how we live our day-to-day lives. For biological organisms, seasonal change typically involves complex physiological and metabolic reorganization, the majority of which is regulated by photoperiodism. Photoperiodism is the ability of animals and plants to use day length or night length, resulting in life-historical transformations, including seasonal development, migration, reproduction, and dormancy...
2017: Advances in Genetics
https://www.readbyqxmd.com/read/29047063/life-cycle-impacts-of-shower-water-waste-heat-recovery-case-study-of-an-installation-at-a-university-sport-facility-in-the-uk
#5
Kenneth Ip, Kaiming She, Kemi Adeyeye
Recovering heat from waste water discharged from showers to preheat the incoming cold water has been promoted as a cost-effective, energy-efficient, and low-carbon design option which has been included in the UK's Standard Assessment Procedure (SAP) for demonstrating compliance with the Building Regulation for dwellings. Incentivized by its carbon cost-effectiveness, waste water heat exchangers (WWHX) have been selected and incorporated in a newly constructed Sports Pavilion at the University of Brighton in the UK...
October 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29045750/aging-and-hiv-related-caregiving-in-sub-saharan-africa-a-social-ecological-approach
#6
Jeon Small, Carolyn Aldwin, Paul Kowal, Somnath Chatterji, Rachel Pruchno
Background and Objectives: We reviewed the literature on older adults (OAs) who are caring for persons living with HIV/AIDS in sub-Saharan Africa (SSA), with the goal of adapting models of caregiver stress and coping to include culturally relevant and contextually appropriate factors specific to SSA, drawing on both life course and cultural capital theories. Research Design and Methods: A systematic literature search found 81 articles published between 1975 and 2016 which were reviewed using a narrative approach...
October 17, 2017: Gerontologist
https://www.readbyqxmd.com/read/29045702/the-edaphic-environment-mediates-flowering-time-differentiation-between-adjacent-populations-of-leptosiphon-parviflorus
#7
Emily L Dittmar, Douglas W Schemske
Flowering time is an important life history trait in plants that often affects fitness. The optimal time to flower may be influenced by trade-offs between flowering time and growth-related traits, and is thus likely to differ among habitats. Because flowering-time differences between populations can also reduce gene flow, understanding the factors that contribute to variation in flowering time among closely adjacent populations that experience gene flow is of particular interest. Plant adaptation to different edaphic environments provides some of the best examples of adaptive divergence at small spatial scales, and often coincides with flowering-time shifts...
October 17, 2017: Journal of Heredity
https://www.readbyqxmd.com/read/29044611/comparative-copper-sensitivity-between-life-stages-of-common-subantarctic-marine-invertebrates
#8
Jessica R Holan, Catherine K King, Andrew R Davis
The development of environmental guidelines in the Antarctic and subantarctic is essential, as expansion of research, tourism and fishing places these regions at increasing risk of contamination. Due to unique conditions in these areas, region specific guidelines are required, however there are currently insufficient data to do this. To develop the most appropriate environmental guidelines, data from the most sensitive life stages of a species should be included to ensure effective protection throughout its life cycle...
October 17, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29044352/-sulphurous-vaginal-douching-and-vulvovaginal-atrophy
#9
M Costantino, V Conti, M B Marongiu, G Napolano, A Filippelli
OBJECTIVE: During climacteric the reduction or interruption of estrogenic stimulus determines a gradual atrophy of the tissues of the urogenital tract.Vulvovaginal atrophy can be cause of dryness, itch, burning, and dyspareunia. Vulvovaginal atrophy is associated also with depression. Hence the importance of an appropriate treatment of the vulvovaginal atrophy. Between therapeutic options we can add, particularly for women who suffer only from vaginal symptoms, the spa therapy that uses mineral waters with benefic effects on vaginal tissue wellness and health...
September 2017: La Clinica Terapeutica
https://www.readbyqxmd.com/read/29040301/surveying-predictors-of-late-life-longitudinal-change-in-daily-activity-energy-expenditure
#10
Vincenzo Valiani, Sandrine Sourdet, Dale A Schoeller, Dawn C Mackey, Douglas C Bauer, Nancy W Glynn, Yosuke Yamada, Tamara B Harris, Todd M Manini
BACKGROUND: Total daily energy expenditure (TEE) is composed of resting metabolic rate (RMR), post-prandial thermogenesis and activity energy expenditure (AEE). Higher AEE is strongly associated with lower mortality and physical limitations among older adults, but factors that predict changes in AEE in septu and octogenarians are not clearly understood. OBJECTIVE: To identify factors associated with late-life longitudinal change in AEE. DESIGN: Energy expenditure was re-assessed in 83 participants (average age at baseline, 74...
2017: PloS One
https://www.readbyqxmd.com/read/29040011/bioactive-edible-films-for-food-applications-influence-of-the-bioactive-compounds-on-film-structure-and-properties
#11
Nasreddine Benbettaïeb, Thomas Karbowiak, Frédéric Debeaufort
Nowadays, a new generation of edible films is being especially designed for incorporating antimicrobials, antioxidants, enzymes or functional ingredients. Edible films made from natural biopolymers become the focus of many research works as an alternative to synthetic food packaging due to their edibility, biodegradability and compostability as well as to their use as active packaging. Active compounds incorporated in edible films could protect foods against deterioration during storage and therefore extend their shelf life...
October 17, 2017: Critical Reviews in Food Science and Nutrition
https://www.readbyqxmd.com/read/29038941/spatial-and-temporal-heavy-metal-distribution-and-surface-water-characterization-of-kanjli-wetland-a-ramsar-site-india-using-different-indices
#12
Navdeep Singh, Manpreet Kaur, Jatinder Kaur Katnoria
Suitability of surface water of Kanjli wetland, Punjab (India) during the period of 2013-2015 was assessed for drinking, irrigation and aquatic life using a water quality index (WQI), heavy metal pollution index (HPI) and aquatic toxicity index (ATI). WQI was calculated using 14 physico-chemical parameters while HPI determination used nine heavy metals like As, Cd, Co, Cr, Cu, Fe, Mn, Pb and Zn. WQI revealed that Kanjli wetland contained medium quality water (irrigation and aquatic life). Cr, Cd and Co exceeded desirable limits of World Health Organization (WHO, Guidelines for drinking-water quality, World Health Organization, Geneva, 2011) and Indian drinking water standard (2012) during all the three seasons (monsoon, post monsoon and winter)...
October 16, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/29037497/comparative-toxicities-of-silver-nitrate-silver-nanocolloids-and-silver-chloro-complexes-to-japanese-medaka-embryos-and-later-effects-on-population-growth-rate
#13
Chisato Kataoka, Yumie Kato, Tadashi Ariyoshi, Masaki Takasu, Takahito Narazaki, Seiji Nagasaka, Haruki Tatsuta, Shosaku Kashiwada
Fish embryo toxicology is important because embryos are more susceptible than adults to toxicants. In addition, the aquatic toxicity of chemicals depends on water quality. We examined the toxicities to medaka embryos of three types of silver-AgNO3, silver nanocolloids (SNCs), and silver ions from silver nanoparticle plates (SNPPs)-under three pH conditions (4.0, 7.0, and 9.0) in embryo-rearing medium (ERM) or ultrapure water. Furthermore, we tested the later-life-stage effects of SNCs on medaka and their population growth...
October 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29037380/thermoconformity-strategy-in-the-freshwater-turtle-hydromedusa-tectifera-testudines-chelidae-in-its-southern-distribution-area
#14
Francisco J Molina, Gerardo C Leynaud
Ectotherm species are not capable of generating metabolic heat; therefore, they present different strategies for regulating their body temperatures, ranging from a precise degree of thermoregulation to a passive thermoconformity with ambient temperatures. In reptiles, aerial basking is the most common mechanism for gaining heat. However, among aquatic reptiles, such as freshwater turtles, aquatic basking is also frequent. Hydromedusa tectifera is a turtle of exclusively aquatic and nocturnal habits widely distributed in South America...
October 2017: Journal of Thermal Biology
https://www.readbyqxmd.com/read/29036681/intra-specific-trends-of-lumen-and-wall-resistivities-of-vessels-within-the-stem-xylem-vary-among-three-woody-plants
#15
Hiroki Ooeda, Ichiro Terashima, Haruhiko Taneda
Water flow through xylem vessels encounters hydraulic resistance when passing through the vessel lumen and end wall. Comparative studies have reported that lumen and end wall resistivities co-limit water flow through stem xylem in several angiosperm woody species that have vessels of different average diameter and length. This study examined the intra-specific relationship between the lumen and end wall resistivities (Rlumen and Rwall) for vessels within the stem xylem using three deciduous angiosperm woody species found in temperate forest...
September 23, 2017: Tree Physiology
https://www.readbyqxmd.com/read/29036342/the-ecophysiology-of-leaf-cuticular-transpiration-are-cuticular-water-permeabilities-adapted-to-ecological-conditions
#16
Ann-Christin Schuster, Markus Burghardt, Markus Riederer
When the stomata are closed under drought, the only route for water loss from the leaf interior to the atmosphere is across the cuticle. Thus, the extent of cuticular transpiration in relation to the reservoirs of water in the plant and the water acquisition from the soil determines the fitness and survival of the plant. It is, therefore, widely assumed that the cuticular water permeability of plants regularly experiencing drought is comparatively low and, thus, adapted to the environment. To test this hypothesis, 382 measurements of cuticular permeability from 160 species were extracted from the literature published between 1996 and 2017...
September 23, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29036305/breeding-for-cuticle-associated-traits-in-crop-species-traits-targets-and-strategies
#17
Johann Petit, Cécile Bres, Jean-Philippe Mauxion, Bénédicte Bakan, Christophe Rothan
Improving crop productivity and quality while promoting sustainable agriculture have become major goals in plant breeding. The cuticle is a natural film covering the aerial organs of plants and consists of lipid polyesters covered and embedded with wax. The cuticle protects plants against water loss and pathogens and affects traits with strong impacts on crop quality such as, for horticultural crops, fruit brightness, cracking, russeting, netting, and shelf life. Here we provide an overview of the most important cuticle-associated traits that can be targeted for crop improvement...
September 27, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29035767/life-cycle-energy-impacts-for-adapting-an-urban-water-supply-system-to-droughts
#18
Ka Leung Lam, Jennifer R Stokes-Draut, Arpad Horvath, Joe L Lane, Steven J Kenway, Paul A Lant
In recent years, cities in some water stressed regions have explored alternative water sources such as seawater desalination and potable water recycling in spite of concerns over increasing energy consumption. In this study, we evaluate the current and future life-cycle energy impacts of four alternative water supply strategies introduced during a decade-long drought in South East Queensland (SEQ), Australia. These strategies were: seawater desalination, indirect potable water recycling, network integration, and rainwater tanks...
October 9, 2017: Water Research
https://www.readbyqxmd.com/read/29035725/alterations-to-juvenile-zebrafish-danio-rerio-swim-performance-after-acute-embryonic-exposure-to-sub-lethal-exposures-of-hydraulic-fracturing-flowback-and-produced-water
#19
Erik J Folkerts, Tamzin A Blewett, Yuhe He, Greg G Goss
Hydraulic fracturing flowback and produced water (FPW) is a wastewater produced during fracturing activities in an operating well which is hyper saline and chemically heterogeneous in nature, containing both anthropogenic and petrogenic chemicals. Determination of FPW associated toxicity to embryonic fish is limited, while investigation into how embryonic exposures may affect later life stages is not yet studied. Zebrafish embryos (24hrs post fertilization) were acutely exposed to 2.5% and 5% FPW fractions for either 24 or 48hrs and returned to freshwater...
October 7, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29035713/an-overview-of-chemical-additives-present-in-plastics-migration-release-fate-and-environmental-impact-during-their-use-disposal-and-recycling
#20
REVIEW
John N Hahladakis, Costas A Velis, Roland Weber, Eleni Iacovidou, Phil Purnell
Over the last 60 years plastics production has increased manifold, owing to their inexpensive, multipurpose, durable and lightweight nature. These characteristics have raised the demand for plastic materials that will continue to grow over the coming years. However, with increased plastic materials production, comes increased plastic material wastage creating a number of challenges, as well as opportunities to the waste management industry. The present overview highlights the waste management and pollution challenges, emphasising on the various chemical substances (known as "additives") contained in all plastic products for enhancing polymer properties and prolonging their life...
October 9, 2017: Journal of Hazardous Materials
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