keyword
MENU ▼
Read by QxMD icon Read
search

Earth

keyword
https://www.readbyqxmd.com/read/28538938/-analysis-of-the-geographical-distribution-of-cases-of-leprosy-rio-de-janeiro-2001-2012
#1
Renata Gracie, Julia Novaes de Barros Peixoto, Fabiane Bertoni Dos Reis Soares, Mariana de Andrea Vilas-Boas Hacker
Studies have demonstrated that the geographical distribution of leprosy is related to different socioeconomic factors. This article aims to study the geographical distribution of leprosy in the state of Rio de Janeiro. The cases of leprosy reported in the 2001-2012 period were mapped according to municipality. Epidemiological and socioeconomic indicators were calculated. The ArcMap program was used for the construction of maps and Earth View to calculate the Bayesian rate. It was observed that leprosy is presented in hyper-endemic levels especially in the metropolitan area...
May 2017: Ciência & Saúde Coletiva
https://www.readbyqxmd.com/read/28537771/atmospheric-constraints-on-the-surface-uv-environment-of-mars-at-3-9%C3%A2-ga-relevant-to-prebiotic-chemistry
#2
Sukrit Ranjan, Robin Wordsworth, Dimitar D Sasselov
Recent findings suggest that Mars may have been a clement environment for the emergence of life and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically important molecules or even nascent life may have formed on Mars and been transferred to Earth. UV light plays a key role in prebiotic chemistry. Characterizing the early martian surface UV environment is key to understanding how Mars compares to Earth as a venue for prebiotic chemistry...
May 24, 2017: Astrobiology
https://www.readbyqxmd.com/read/28535600/new-approach-to-resolve-the-humidity-problem-in-voc-determination-in-outdoor-air-samples-using-solid-adsorbent-tubes-followed-by-td-gc-ms
#3
Alba Maceira, Laura Vallecillos, Francesc Borrull, Rosa Maria Marcé
This study describes the humidity effect in the sampling process by adsorbent tubes followed by thermal desorption and gas chromatography-mass spectrometry (TD-GC-MS) for the determination of volatile organic compounds (VOCs) in air samples and evaluates possible solutions to this problem. Two multi-sorbent bed tubes, Tenax TA/Carbograph 1TD and Carbotrap B/Carbopack X/Carboxen 569, were tested in order to evaluate their behaviour in the presence of environmental humidity. Humidity problems were demonstrated with carbon-based tubes, while Tenax-based tubes did not display any influence...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535413/controllable-synthesis-and-luminescent-properties-of-rare-earth-doped-gd2-moo4-3-nanoplates
#4
Lei Zhang, Bohua Dong, Guohua Wang, Rongjie Gao, Ge Su, Wei Wang, Lixin Cao
For the first time, we have successfully synthesized rare-earth doped Gd2(MoO4)3: RE(3+) (RE=Eu, Tb) nanoplates by solvothermal method. The morphology of Gd2(MoO4)3 can be manipulated by changing the reaction times and reaction temperatures. The composition and surface morphology have been investigated by X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), respectively. Under the excitation of UV, Photoluminescence (PL) has been used to explore the excellent luminescence properties of the synthesized nanophosphors...
April 21, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28535065/silica-polymerization-from-supersaturated-dilute-aqueous-solutions-in-the-presence-of-alkaline-earth-salts
#5
Marina Kley, Andreas Kempter, Volodymyr Boyko, Klaus Huber
The early stages of silica polymerization in aqueous solution proceeds according to a mechanism based on three steps: nucleation, particle growth and agglomeration of the particles. Application of time-resolved static and dynamic light scattering as a powerful in-situ technique in combination with spectrophotometric analysis of the monomer consumption based on the molybdenum blue method was carried out to further investigate this 3-step process. Experiments were carried out at four different initial silicic acid contents covering a range between 350 ppm and 750 ppm in the presence of either 10 mM NaCl or 5 mM of a mixture of CaCl2 and MgCl2...
May 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28534869/advancing-precambrian-palaeomagnetism-with-the-paleomagia-and-pint-qpi-databases
#6
Toni H Veikkolainen, Andrew J Biggin, Lauri J Pesonen, David A Evans, Nicholas A Jarboe
State-of-the-art measurements of the direction and intensity of Earth's ancient magnetic field have made important contributions to our understanding of the geology and palaeogeography of Precambrian Earth. The PALEOMAGIA and PINT(QPI) databases provide thorough public collections of important palaeomagnetic data of this kind. They comprise more than 4,100 observations in total and have been essential in supporting our international collaborative efforts to understand Earth's magnetic history on a timescale far longer than that of the present Phanerozoic Eon...
May 23, 2017: Scientific Data
https://www.readbyqxmd.com/read/28534836/differentiation-and-structure-in-sulfolobus-islandicus-rod-shaped-virus-populations
#7
Maria A Bautista, Jesse A Black, Nicholas D Youngblut, Rachel J Whitaker
In the past decade, molecular surveys of viral diversity have revealed that viruses are the most diverse and abundant biological entities on Earth. In culture, however, most viral isolates that infect microbes are represented by a few variants isolated on type strains, limiting our ability to study how natural variation affects virus-host interactions in the laboratory. We screened a set of 137 hot spring samples for viruses that infect a geographically diverse panel of the hyperthemophilic crenarchaeon Sulfolobus islandicus...
May 19, 2017: Viruses
https://www.readbyqxmd.com/read/28534816/roi-based-on-board-compression-for-hyperspectral-remote-sensing-images-on-gpu
#8
Rossella Giordano, Pietro Guccione
In recent years, hyperspectral sensors for Earth remote sensing have become very popular. Such systems are able to provide the user with images having both spectral and spatial information. The current hyperspectral spaceborne sensors are able to capture large areas with increased spatial and spectral resolution. For this reason, the volume of acquired data needs to be reduced on board in order to avoid a low orbital duty cycle due to limited storage space. Recently, literature has focused the attention on efficient ways for on-board data compression...
May 19, 2017: Sensors
https://www.readbyqxmd.com/read/28534481/structural-water-engaged-disordered-vanadium-oxide-nanosheets-for-high-capacity-aqueous-potassium-ion-storage
#9
Daniel Scott Charles, Mikhail Feygenson, Katharine Page, Joerg Neuefeind, Wenqian Xu, Xiaowei Teng
Aqueous electrochemical energy storage devices using potassium-ions as charge carriers are attractive due to their superior safety, lower cost and excellent transport properties compared to other alkali ions. However, the accommodation of potassium-ions with satisfactory capacity and cyclability is difficult because the large ionic radius of potassium-ions causes structural distortion and instabilities even in layered electrodes. Here we report that water induces structural rearrangements of the vanadium-oxygen octahedra and enhances stability of the highly disordered potassium-intercalated vanadium oxide nanosheets...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28533563/why-do-the-boreal-forest-ecosystems-of-northwestern-europe-differ-from-those-of-western-north-america
#10
Rudy Boonstra, Harry P Andreassen, Stan Boutin, Jan Hušek, Rolf A Ims, Charles J Krebs, Christina Skarpe, Petter Wabakken
The boreal forest is one of the largest terrestrial biomes on Earth. Conifers normally dominate the tree layer across the biome, but other aspects of ecosystem structure and dynamics vary geographically. The cause of the conspicuous differences in the understory vegetation and the herbivore-predator cycles between northwestern Europe and western North America presents an enigma. Ericaceous dwarf shrubs and 3- to 4-year vole-mustelid cycles characterize the European boreal forests, whereas tall deciduous shrubs and 10-year snowshoe hare-lynx cycles characterize the North American ones...
September 1, 2016: Bioscience
https://www.readbyqxmd.com/read/28533378/pyrite-sulfur-isotopes-reveal-glacial-interglacial-environmental-changes
#11
Virgil Pasquier, Pierre Sansjofre, Marina Rabineau, Sidonie Revillon, Jennifer Houghton, David A Fike
The sulfur biogeochemical cycle plays a key role in regulating Earth's surface redox through diverse abiotic and biological reactions that have distinctive stable isotopic fractionations. As such, variations in the sulfur isotopic composition (δ(34)S) of sedimentary sulfate and sulfide phases over Earth history can be used to infer substantive changes to the Earth's surface environment, including the rise of atmospheric oxygen. Such inferences assume that individual δ(34)S records reflect temporal changes in the global sulfur cycle; this assumption may be well grounded for sulfate-bearing minerals but is less well established for pyrite-based records...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533361/healthy-offspring-from-freeze-dried-mouse-spermatozoa-held-on-the-international-space-station-for-9-months
#12
Sayaka Wakayama, Yuko Kamada, Kaori Yamanaka, Takashi Kohda, Hiromi Suzuki, Toru Shimazu, Motoki N Tada, Ikuko Osada, Aiko Nagamatsu, Satoshi Kamimura, Hiroaki Nagatomo, Eiji Mizutani, Fumitoshi Ishino, Sachiko Yano, Teruhiko Wakayama
If humans ever start to live permanently in space, assisted reproductive technology using preserved spermatozoa will be important for producing offspring; however, radiation on the International Space Station (ISS) is more than 100 times stronger than that on Earth, and irradiation causes DNA damage in cells and gametes. Here we examined the effect of space radiation on freeze-dried mouse spermatozoa held on the ISS for 9 mo at -95 °C, with launch and recovery at room temperature. DNA damage to the spermatozoa and male pronuclei was slightly increased, but the fertilization and birth rates were similar to those of controls...
May 22, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28533143/drugs-in-space-pharmacokinetics-and-pharmacodynamics-in-astronauts
#13
Johannes Kast, Yichao Yu, Christoph N Seubert, Virginia E Wotring, Hartmut Derendorf
Space agencies are working intensely to push the current boundaries of human spaceflight by sending astronauts deeper into space than ever before, including missions to Mars and asteroids. Spaceflight alters human physiology due to fluid shifts, muscle and bone loss, immune system dysregulation, and changes in the gastrointestinal tract and metabolic enzymes. These alterations may change the pharmacokinetics and/or pharmacodynamics of medications used by astronauts and subsequently might impact drug efficacy and safety...
May 19, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28533016/drodvir-a-resource-for-exploring-the-virome-diversity-in-rodents
#14
Lihong Chen, Bo Liu, Zhiqiang Wu, Qi Jin, Jian Yang
Emerging zoonotic diseases have received tremendous interests in recent years, as they pose a significant threat to human health, animal welfare, and economic stability. A high proportion of zoonoses originate from wildlife reservoirs. Rodents are the most numerous, widespread, and diverse group of mammals on the earth and are reservoirs for many zoonotic viruses responsible for significant morbidity and mortality. A better understanding of virome diversity in rodents would be of importance for researchers and professionals in the field...
May 3, 2017: Journal of Genetics and Genomics, Yi Chuan Xue Bao
https://www.readbyqxmd.com/read/28530803/red-phosphorus-nano-dots-on-reduced-graphene-oxide-as-a-flexible-and-ultra-fast-anode-for-sodium-ion-batteries
#15
Yihang Liu, Anyi Zhang, Chenfei Shen, Qingzhou Liu, Xuan Cao, Yuqiang Ma, Liang Chen, Christian Lau, Tian-Chi Chen, Fei Wei, Chongwu Zhou
Sodium-ion batteries offer an attractive option for potential low cost and large scale energy storage due to the earth abundance of sodium. Red phosphorus is considered as a high capacity anode for sodium-ion batteries with a theoretical capacity of 2596 mAh/g. However, similar to silicon in lithium-ion batteries, several limitations such as large volume expansion upon sodiation/de-sodiation and low electronic conductance have severely limited the performance of red phosphorus anodes. In order to address the above challenges, we have developed a method to deposit red phosphorus nano-dots densely and uniformly onto reduced graphene oxide sheets (P@RGO) to minimize the sodium ion diffusion length and the sodiation/de-sodiation stresses, and the RGO network also serves as electron pathway and creates free space to accommodate the volume variation of phosphorus particles...
May 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28530387/three-dimensional-dendritic-structures-of-nicomo-as-efficient-electrocatalysts-for-the-hydrogen-evolution-reaction
#16
Di Gao, Jiangna Guo, Xun Cui, Lin Yang, Yang Yang, Huichao He, Peng Xiao, Yunhuai Zhang
Earth-abundant first-row (3d) transition-metal-based catalysts such as bimetallic Ni-Co represent an emerging class of electrocatalysts for HER, but they operate at overpotentials significantly above thermodynamic requirements. Here we doped NiCo catalyst with non-3d metals molybdenum (Mo) for improvement in catalyzing the hydrogen evolution reaction. The ternary catalyst was readily obtained by a one-pot process via the sequential electrodeposition of Ni, Co and Mo precursors on titanium (Ti) support. By tailing the deposition conditions we fabricated NiCoMo catalysts with three-dimensional dendritic structures, exhibiting large amounts of electrochemically active sites...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530231/constraining-climate-sensitivity-and-continental-versus-seafloor-weathering-using-an-inverse-geological-carbon-cycle-model
#17
Joshua Krissansen-Totton, David C Catling
The relative influences of tectonics, continental weathering and seafloor weathering in controlling the geological carbon cycle are unknown. Here we develop a new carbon cycle model that explicitly captures the kinetics of seafloor weathering to investigate carbon fluxes and the evolution of atmospheric CO2 and ocean pH since 100 Myr ago. We compare model outputs to proxy data, and rigorously constrain model parameters using Bayesian inverse methods. Assuming our forward model is an accurate representation of the carbon cycle, to fit proxies the temperature dependence of continental weathering must be weaker than commonly assumed...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28529794/crystal-structures-of-two-alkaline-earth-m-ba-and-sr-dimanganese-ii-iron-iii-tris-orthophosphates
#18
Ghaleb Alhakmi, Abderrazzak Assani, Mohamed Saadi, Lahcen El Ammari
Two new orthophosphates, BaMn2Fe(PO4)3 [barium dimanganese(II) iron(III) tris-(orthophosphate)] and SrMn2Fe(PO4)3 [strontium dimanganese(II) iron(III) tris-(orthophosphate)], were synthesized by solid-state reactions. They are isotypic and crystallize in the ortho-rhom-bic system with space group type Pbcn. Their crystal structures comprise infinite zigzag chains of edge-sharing FeO6 octa-hedra (point group symmetry .2.) and Mn2O10 double octa-hedra running parallel to [001], linked by two types of PO4 tetra-hedra...
May 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28529298/an-aspect-of-the-history-of-medicine-in-ancient-korea-as-examined-through-silla-buddhist-monks-annotations-on-the-chapter-on-eliminating-disease-in-the-sutra-of-golden-light-suvarnabh%C3%A4-sa-s%C3%A5-tra
#19
Chaekun Oh, Jongwook Jeon, Dongwon Shin
Nearly nothing is known of medicine in ancient Korea due to insufficient materials. With several extant prescriptions and esoteric methods of treating diseases alone, it is impossible to gauge in depth the management of medicine during this period. If one exception were to be cited, that would be the fact that the annotations for understanding the contents on Indian medicine in the "Chapter on Eliminating Disease" in the Sutra of Golden Light, a Buddhist sutra originating from India, reflected the medical knowledge of Buddhist monks from Silla (57 BC-935 AD) who were active immediately after the nation's unification of the two other kingdoms on the Korean Peninsula (668 AD) such as Wonhyo (617-686 AD), Gyeongheung (620?-700? AD), and Seungjang (684-? AD)...
December 2016: Ŭi Sahak
https://www.readbyqxmd.com/read/28528413/dissolved-platinum-concentrations-in-coastal-seawater-boso-to-sanriku-areas-japan
#20
Asami Suzuki Mashio, Hajime Obata, Toshitaka Gamo
Platinum, one of the rarest elements in the earth's crust, is now widely used in a range of products, such as catalytic converters in automobiles and anticancer drugs. Increasing use and dispersal of platinum has the potential to affect aquatic environments. Platinum concentrations in open ocean seawater have been found to be very low (approximately 0.2 pmol/L); however, Pt distributions and biogeochemical cycles in coastal areas are unknown. In this study, we investigated Pt concentrations in coastal waters between the Boso and Sanriku areas, Japan, after the 2011 tsunami...
May 20, 2017: Archives of Environmental Contamination and Toxicology
keyword
keyword
113758
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"