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https://www.readbyqxmd.com/read/28222370/increased-postural-sway-in-persons-with-multiple-sclerosis-during-short-term-exposure-to-warm-ambient-temperatures
#1
Paula Y S Poh, Amy N Adams, Mu Huang, Dustin R Allen, Scott L Davis, Anna S Tseng, Craig G Crandall
BACKGROUND: Multiple sclerosis (MS) is a neurological disease marked by demyelination and axonal loss. Individuals with MS experience increases in clinical signs and symptoms during heat exposure. OBJECTIVE: To test the hypothesis that moderate heat exposure adversely affects postural sway in individuals with MS. METHODS: Ten individuals with relapsing-remitting MS (50±8y) and nine controls (47±10y) were examined under a Thermal and a Time Control trial...
February 8, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28220301/evidence-that-higher-co2-increases-tree-growth-sensitivity-to-temperature-a-comparison-of-modern-and-paleo-oaks
#2
Steven L Voelker, Michael C Stambaugh, J Renée Brooks, Frederick C Meinzer, Barbara Lachenbruch, Richard P Guyette
To test tree growth sensitivity to temperature under different ambient CO2 concentrations, we determined stem radial growth rates as they relate to variation in temperature during the last deglacial period, and compare these to modern tree growth rates as they relate to spatial variation in temperature across the modern species distributional range. Paleo oaks were sampled from Northern Missouri, USA and compared to a pollen-based, high-resolution paleo temperature reconstruction from Northern Illinois, USA...
February 20, 2017: Oecologia
https://www.readbyqxmd.com/read/28219034/preparation-of-core-shell-nanostructure-fe3o4-peg400-so3h-as-heterogeneous-and-magnetically-recyclable-nanocatalyst-for-one-pot-synthesis-of-substituted-pyrroles-by-paal-knorr-reaction-at-room-temperature
#3
Fahimeh Bonyasi, Malak Hekmati, Hojat Veisi
An efficient procedure has been proposed for the loading of sulfonic acid groups on the surface of polyethylene glycol 400 (PEG400)-encapsulated Fe3O4 nanoparticles to synthesize a core-shell Fe3O4@PEG400-SO3H nano catalyst. Surface functionalization of magnetic particles in such a way is a refined method of bridging the gap amongst heterogeneous and homogeneous catalysis. The procured nano catalyst was classified through Fourier transformed infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), wavelength-dispersive X-ray spectroscopy (WDX), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), BET, and back titration...
February 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28218652/steady-%C3%AE-ray-effects-on-the-performance-of-ppp-botda-and-tw-cotdr-fiber-sensing
#4
Isabelle Planes, Sylvain Girard, Aziz Boukenter, Emmanuel Marin, Sylvie Delepine-Lesoille, Claude Marcandella, Youcef Ouerdane
We investigated the evolution of the performances of Pulse Pre Pump-Brillouin Time Domain Analysis (PPP-BOTDA) and Tunable Wavelength Coherent Optical Time Domain Reflectometry (TW-COTDR) fiber-based temperature and strain sensors when the sensing optical fiber is exposed to two γ-ray irradiation conditions: (i) at room temperature and a dose rate of 370 Gy(SiO2)/h up to a total ionizing dose (TID) of 56 kGy; (ii) at room temperature and a dose rate of 25 kGy(SiO2)/h up to a TID of 10 MGy. Two main different classes of single-mode optical fibers have been tested in situ, radiation-tolerant ones: fluorine-doped or nitrogen-doped core fibers, as well as Telecom-grade germanosilicate ones...
February 17, 2017: Sensors
https://www.readbyqxmd.com/read/28218530/ultrafast-excited-state-dynamics-in-a-molecular-motors-coupling-of-motor-length-to-medium-viscosity
#5
Jamie Conyard, Peter Stacko, Jiawen Chen, Sophie McDonagh, Christopher R Hall, Sergey P Laptenok, Wesley R Browne, Ben L Feringa, Stephen R Meech
Photochemically driven molecular motors convert the energy of incident radiation to intramolecular rotational motion. The motor molecules considered here execute four step unidirectional rotational motion. This comprises a pair of successive light induced isomerizations to a metastable state followed by thermal helix inversions. The internal rotation of a large molecular unit required in these steps is expected to be sensitive to both the viscosity of the medium and the volume of the rotating unit. In this work we describe a study of motor motion in both ground and excited states as a function of the size of the rotating units...
February 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28217912/cold-adaptation-of-the-antarctic-haloarchaea-halohasta-litchfieldiae-and-halorubrum-lacusprofundi
#6
Timothy J Williams, Yan Liao, Jun Ye, Rhiannon P Kuchel, Anne Poljak, Mark J Raftery, Ricardo Cavicchioli
Halohasta litchfieldiae represents ∼ 44% and Halorubrum lacusprofundi ∼ 10% of the hypersaline, perennially cold (≥ -20°C) Deep Lake community in Antarctica. We used proteomics and microscopy to define physiological responses of these haloarchaea to growth at high (30°C) and low (10 and 4°C) temperatures. The proteomic data indicate that both species responded to low temperature by modifying their cell envelope including protein N-glycosylation, maintaining osmotic balance and translation initiation, and modifying RNA turnover and tRNA modification...
February 20, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28216802/constraint-is-associated-with-earlier-circadian-phase-and-morningness-confirmation-of-relationships-between-personality-and-circadian-phase-using-a-constant-routine-protocol
#7
B Bullock, G Murray, J L Anderson, T Cooper-O'Neill, J J Gooley, S W Cain, S W Lockley
Associations among personality, diurnal preference, and circadian phase were investigated using a constant routine laboratory protocol. One hundred and sixty-eight healthy participants aged 18-30 years (Women n = 68) completed either a 30- or 50-hour constant routine under dim-light conditions (<3 lux), during which circadian phase was measured from core body temperature and melatonin. Prior to laboratory admission, self-report measures of personality and diurnal preference were also obtained. The personality trait of Constraint correlated positively with morning diurnal preference and earlier circadian phase, with circadian phase partially mediating the relationship between Constraint and diurnal preference...
January 2017: Personality and Individual Differences
https://www.readbyqxmd.com/read/28216664/iron-isotopic-fractionation-between-silicate-mantle-and-metallic-core-at-high-pressure
#8
Jin Liu, Nicolas Dauphas, Mathieu Roskosz, Michael Y Hu, Hong Yang, Wenli Bi, Jiyong Zhao, Esen E Alp, Justin Y Hu, Jung-Fu Lin
The +0.1‰ elevated (56)Fe/(54)Fe ratio of terrestrial basalts relative to chondrites was proposed to be a fingerprint of core-mantle segregation. However, the extent of iron isotopic fractionation between molten metal and silicate under high pressure-temperature conditions is poorly known. Here we show that iron forms chemical bonds of similar strengths in basaltic glasses and iron-rich alloys, even at high pressure. From the measured mean force constants of iron bonds, we calculate an equilibrium iron isotope fractionation between silicate and iron under core formation conditions in Earth of ∼0-0...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28215807/proteomic-responses-of-european-flounder-to-temperature-and-hypoxia-as-interacting-stressors-differential-sensitivities-of-populations
#9
Nicolas Pédron, Sébastien Artigaud, José-Luis Zambonino Infante, Nicolas Le Bayon, Grégory Charrier, Vianney Pichereau, Jean Laroche
In the context of global change, ectotherms are increasingly impacted by abiotic perturbations. Along the distribution area of a species, the populations at low latitudes are particularly exposed to temperature increase and hypoxic events. In this study, we have compared the proteomic responses in the liver of European flounder populations, by using 2-D electrophoresis. One southern peripheral population from Portugal vs two northern core populations from France, were reared in a common garden experiment. Most of the proteomic differences were observed between the two experimental conditions, a cold vs a warm and hypoxic conditions...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214513/molecular-dynamics-simulation-study-of-the-effect-of-glycerol-dialkyl-glycerol-tetraether-hydroxylation-on-membrane-thermostability
#10
Carme Huguet, Susanne Fietz, Antoni Rosell-Melé, Xavier Daura, Lionel Costenaro
Archaeal tetraether membrane lipids span the whole membrane width and present two C40 isoprenoid chains bound by two glycerol groups (or one glycerol and calditol). These lipids confer stability and maintain the membrane fluidity in mesophile to extremophile environments, making them very attractive for biotechnological applications. The isoprenoid lipid composition in archaeal membranes varies with temperature, which has placed these lipids in the focus of paleo-climatological studies for about a decade. Non-hydroxylated isoprenoid archaeal lipids are typically used as paleo-thermometry proxies, but recently identified hydroxylated (OH) derivatives have also been proposed as temperature proxies...
February 15, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28214357/nesting-habits-influence-population-genetic-structure-of-a-bee-living-in-anthropogenic-disturbance
#11
J L Vickruck, M H Richards
While most organisms are negatively affected by anthropogenic disturbance, a few species thrive in landscapes altered by humans. Typically, native bees are negatively impacted by anthropogenic environmental change, including habitat alteration and climate change. Here we investigate the population structure of the eastern carpenter bee Xylocopa virginica, a generalist pollinator with a broad geographic range spanning eastern North America. Eastern carpenter bees now nest almost exclusively in human made wooden structures, linking their geographic distribution and population structure to human activities and disturbance...
February 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28213230/the-pentafluorophenyl-stationary-phase-shows-a-unique-separation-efficiency-for-performing-fast-chromatography-determination-of-highbush-blueberry-anthocyanins
#12
Barbora Šmídová, Dalibor Šatínský, Kateřina Dostálová, Petr Solich
A high-performance liquid chromatography method using an alternative pentafluorophenyl (PFP) core-shell stationary phase has been developed and used for rapid separation of 23 anthocyanins in a highbush blueberry Bluehaven cultivar. A high efficiency of separation of anthocyanins was achieved in the core-shell column Kinetex PFP, 150×4.6mm (particle size 2.6µm) with a 5×4.6mm precolumn, using a simple linear gradient elution with a mobile phase of acetonitrile and a water solution of 2% formic acid at a flow rate of 1...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213040/the-locus-of-heat-resistance-lhr-mediates-heat-resistance-in-salmonella-enterica-escherichia-coli-and-enterobacter-cloacae
#13
Ryan G Mercer, Brian D Walker, Xianqin Yang, Lynn M McMullen, Michael G Gänzle
Enterobacteriaceae comprise food spoilage organisms as well as food-borne pathogens including Escherichia coli. Heat resistance in E. coli was attributed to a genomic island called the locus of heat resistance (LHR). This genomic island is also present in several other genera of Enterobacteriaceae, but its function in the enteric pathogens Salmonella enterica and Enterobacter cloacae is unknown. This study aimed to determine the frequency of the LHR in food isolates of E. coli, and its influence on heat resistance in S...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28212707/astrobiological-implications-of-dim-light-phototrophy-in-deep-sea-red-clays
#14
Anindita Das, Tanya Singh, P A LokaBharathi, Prashant K Dhakephalkar, Sweta Mallik, Pranav R Kshirsagar, N H Khadge, B Nagender Nath, Satadru Bhattacharya, Aditya Kumar Dagar, Prabhjot Kaur, Dwijesh Ray, Anil D Shukla, Christabelle E G Fernandes, Sheryl O Fernandes, Tresa Remya A Thomas, Mamatha S S, Babu Shashikant Mourya, Ram Murti Meena
Red clays of Central Indian Basin (CIB) under influence of trace of Rodriguez Triple Junction exhibited chemoautotrophy, low temperature hydrothermal alterations and photoautotrophic potential. Seamount flank TVBC-08, hosting such signatures revealed dominance of aerobic anoxygenic phototroph Erythrobacter, with 93% of total 454 pyrosequencing tags. Subsequently, enrichments for both aerobic (Erythrobacter) and anaerobic anoxygenic phototrophs (green and purple sulphur bacteria) under red and white LED light illumination, with average irradiance 30...
February 2017: Life Sciences in Space Research
https://www.readbyqxmd.com/read/28212027/ferromagnetic-coupling-in-the-heterospin-bis-catecholato-manganese-iv-complex-with-pyridine-substituted-by-nitronyl-nitroxide
#15
Michael P Bubnov, Irina A Teplova, Eugenia A Kopylova, Konstantin A Kozhanov, Artem S Bogomyakov, Marina V Petrova, Vitaly A Morozov, Victor I Ovcharenko, Vladimir K Cherkasov
A new bis(3,6-di-tert-butyl-catecholato)manganese complex with two 4-NIT-Py ligands was synthesized and characterized [4-NIT-Py = pyridine substituted at position 4 with nitronyl-nitroxide radical, 2-(pyridin-4-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl]. X-ray diffraction indicated an octahedral environment of the manganese atom with a trans arrangement of ligands. Bonds lengths in the inner coordination core of the metal and in the chelate cycles that are representative of the charge distribution between the metal and ligands displayed a Mn(IV)(Cat(2-))2 charge distribution...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211151/phenotypic-distribution-models-corroborate-species-distribution-models-a-shift-in-the-role-and-prevalence-of-a-dominant-prairie-grass-in-response-to-climate-change
#16
Adam B Smith, Jacob Alsdurf, Mary Knapp, Sara G Baer, Loretta C Johnson
Phenotypic variation within species can vary widely across environmental gradients but forecasts of species' responses to environmental change often assume species respond homogenously across their ranges. We compared predictions from species and phenotype distribution models under future climate scenarios for Andropogon gerardii, a widely distributed, dominant grass found throughout the central United States. Phenotype data on aboveground biomass, height, leaf width, and chlorophyll content were obtained from 33 populations spanning a ~1000-km gradient that encompassed the majority of the species' environmental range...
February 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28210967/core-shell-drug-carrier-from-folate-conjugated-chitosan-obtained-from-prawn-shell-for-targeted-doxorubicin-delivery
#17
Md Sazedul Islam, Papia Haque, Taslim U Rashid, M Nuruzzaman Khan, Abul K Mallik, M Nazrul I Khan, Mala Khan, Mohammed Mizanur Rahman
A multifunctional drug carrier with dual targeting (magnetic and folate-receptor) and pH sensitive core-shell hybrid nanomaterial has been developed to carry an anticancer drug doxorubicin.Superparamagnetic iron oxide nanoparticles (IONPs) were used as core of the carrier and cross-linked folate conjugated chitosan (FA-CS) was acted as shell in which doxorubicin was physically entrapped. Transmission electron microscopy (TEM) analysis confirmed the average particle size of IONPs and FA-CS coated IONPs 8.2 and 15...
April 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28209517/inadvertent-hypothermia-and-mortality-in-critically-ill-adults-systematic-review-and-meta-analysis
#18
REVIEW
Panagiotis Kiekkas, Fotini Fligou, Michael Igoumenidis, Nikolaos Stefanopoulos, Evangelos Konstantinou, Vasilios Karamouzos, Diamanto Aretha
OBJECTIVE: Considering that inadvertent hypothermia (IH) is common in Intensive Care Unit (ICU) patients and can be followed by severe complications, this systematic review identified, appraised and synthesized the published literature about the association between IH and mortality in adults admitted to the ICU. DATA SOURCES: By using key terms, literature searches were conducted in Pubmed, CINAHL, Cochrane Library, Web of Science and EMBASE. REVIEW METHODS: According to PRISMA guidelines, articles published between 1980-2016 in English-language, peer-reviewed journals were considered...
February 13, 2017: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/28208688/the-impact-of-heat-exposure-and-sleep-restriction-on-firefighters-work-performance-and-physiology-during-simulated-wildfire-suppression
#19
Grace E Vincent, Brad Aisbett, Brianna Larsen, Nicola D Ridgers, Rod Snow, Sally A Ferguson
This study was designed to examine the effects of ambient heat on firefighters' physical task performance, and physiological and perceptual responses when sleep restricted during simulated wildfire conditions. Thirty firefighters were randomly allocated to the sleep restricted (n = 17, SR; 19 °C, 4-h sleep opportunity) or hot and sleep restricted (n = 13, HOT + SR; 33 °C, 4-h sleep opportunity) condition. Firefighters performed two days of simulated, intermittent, self-paced work circuits comprising six firefighting tasks...
February 12, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28208440/charge-segregation-in-weakly-ionized-microgels
#20
John S Hyatt, Alison M Douglas, Chris Stanley, Changwoo Do, Thomas H Barker, Alberto Fernández-Nieves
We investigate microgels synthesized from N-isopropylacrylamide (NIPAM) copolymerized with a large mol% of acrylic acid, finding that when the acid groups are partially ionized at high temperatures, competition between ion-induced swelling and hydrophobic deswelling of poly(NIPAM) chains results in microphase separation. In cross-linked microgels, this manifests as a dramatic decrease in the ratio between the radius of gyration and the hydrodynamic radius to ∼0.2, indicating that almost all the mass of the microgel is concentrated near the particle center...
January 2017: Physical Review. E
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