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https://www.readbyqxmd.com/read/28531916/effects-of-elevated-atmospheric-co2-on-dissolution-of-geological-fluorapatite-in-water-and-soil
#1
Zhen Li, Mu Su, Da Tian, Lingyi Tang, Lin Zhang, Yangfan Zheng, Shuijin Hu
Most of phosphorus (P) is present as insoluble phosphorus-bearing minerals or organic forms in soil. Geological fluorapatite (FAp) is the dominant mineral-weathering source of P. In this study, FAp was added into water and soil under elevated CO2 to investigate the pathway of P release. Two types of soils (an acidic soil from subtropical China and a saline-alkali soil from Tibet Plateau, China) with similar total P content were studied. In the solution, increased CO2 in air enhanced the dissolution of FAp, i...
May 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28530845/temporal-variation-in-the-abundance-and-timing-of-daily-activity-of-chagas-disease-vector-triatoma-gerstaeckeri-st%C3%A3-l-1859-in-a-natural-habitat-in-the-lower-rio-grande-valley-south-texas
#2
Alfredo Flores, Christopher Vitek, Teresa Feria Arroyo, Brian Lund Fredensborg
Chagas disease caused by Trypanosoma cruzi is a burden to millions of people in South and Central America. A sylvatic life cycle of the parasite exists in the Southern United States, but recent studies indicate an active peri-domestic life cycle of T. cruzi in Texas. The USA-Mexico border region in Texas displays areas of high poverty and sub-standard housing conditions which are important risk factors for a potential spill-over transmission to a domestic life cycle including humans. The objectives of the study were to examine short- and longterm temporal variation in vector activity, and to evaluate the effect of different combinations of attractants on the capture of potential triatomine vectors...
May 22, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28529505/comparative-genomics-unravels-the-functional-roles-of-co-occurring-acidophilic-bacteria-in-bioleaching-heaps
#3
Xian Zhang, Xueduan Liu, Yili Liang, Yunhua Xiao, Liyuan Ma, Xue Guo, Bo Miao, Hongwei Liu, Deliang Peng, Wenkun Huang, Huaqun Yin
The spatial-temporal distribution of populations in various econiches is thought to be potentially related to individual differences in the utilization of nutrients or other resources, but their functional roles in the microbial communities remain elusive. We compared differentiation in gene repertoire and metabolic profiles, with a focus on the potential functional traits of three commonly recognized members (Acidithiobacillus caldus, Leptospirillum ferriphilum, and Sulfobacillus thermosulfidooxidans) in bioleaching heaps...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28529384/the-pelskin-project-part-v-towards-the-control-of-the-flow-around-aerofoils-at-high-angle-of-attack-using-a-self-activated-deployable-flap
#4
Marco E Rosti, Laura Kamps, Christoph Bruecker, Mohammad Omidyeganeh, Alfredo Pinelli
During the flight of birds, it is often possible to notice that some of the primaries and covert feathers on the upper side of the wing pop-up under critical flight conditions, such as the landing approach or when stalking their prey (see Fig. 1) . It is often conjectured that the feathers pop up plays an aerodynamic role by limiting the spread of flow separation . A combined experimental and numerical study was conducted to shed some light on the physical mechanism determining the feathers self actuation and their effective role in controlling the flow field in nominally stalled conditions...
2017: Meccanica
https://www.readbyqxmd.com/read/28527250/-risk-of-transmission-of-chagas-disease-by-intrusion-of-triatomines-and-wild-mammals-in-bucaramanga-santander-colombia
#5
Marlene Reyes, Ángela Torres, Lyda Esteban, Mónica Flórez, Víctor Manuel Angulo
INTRODUCTION: Notice of triatomines in dwellings of some neighborhoods in Bucaramanga motivated the realization of this study.Objetive: To evaluate the intrusion of triatomines and mammals, as well as some risk factors in urban dwellings. MATERIALS AND METHODS: Triatomines were collected in a neighborhood in Bucaramanga, Santander, on a monthly basis during one year with participation of the community. Collection included manual search in lamp posts, use of light traps, animal bait, and chemical attractants in nearby forests...
January 24, 2017: Biomédica: Revista del Instituto Nacional de Salud
https://www.readbyqxmd.com/read/28527179/making-time-conservation-of-biological-clocks-from-fungi-to-animals
#6
Jay C Dunlap, Jennifer J Loros
The capacity for biological timekeeping arose at least three times through evolution, in prokaryotic cyanobacteria, in cells that evolved into higher plants, and within the group of organisms that eventually became the fungi and the animals. Neurospora is a tractable model system for understanding the molecular bases of circadian rhythms in the last of these groups, and is perhaps the most intensively studied circadian cell type. Rhythmic processes described in fungi include growth rate, stress responses, developmental capacity, and sporulation, as well as much of metabolism; fungi use clocks to anticipate daily environmental changes...
May 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28526259/the-impact-of-daytime-light-exposures-on-sleep-and-mood-in-office-workers
#7
Mariana G Figueiro, Bryan Steverson, Judith Heerwagen, Kevin Kampschroer, Claudia M Hunter, Kassandra Gonzales, Barbara Plitnick, Mark S Rea
BACKGROUND: By affecting the internal timing mechanisms of the brain, light regulates human physiology and behavior, perhaps most notably the sleep-wake cycle. Humans spend over 90% of their waking hours indoors, yet light in the built environment is not designed to affect circadian rhythms. OBJECTIVE: Using a device calibrated to measure light that is effective for the circadian system (circadian-effective light), collect personal light exposures in office workers and relate them to their sleep and mood...
June 2017: Sleep Health
https://www.readbyqxmd.com/read/28526054/assessing-degradation-of-composite-resin-cements-during-artificial-aging-by-martens-hardness
#8
Stefan Bürgin, Nadja Rohr, Jens Fischer
BACKGROUND: Aim of the study was to verify the efficiency of Martens hardness measurements in detecting the degradation of composite resin cements during artificial aging. METHODS: Four cements were used: Variolink II (VL2), RelyX Unicem 2 Automix (RUN), PermaFlo DC (PDC), and DuoCem (DCM). Specimens for Martens hardness measurements were light-cured and stored in water at 37 °C for 1 day to allow complete polymerization (baseline). Subsequently the specimens were artificially aged by water storage at 37 °C or thermal cycling (n = 6)...
May 19, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/28525392/the-effects-of-structural-properties-on-the-lithium-storage-behavior-of-mesoporous-tio2
#9
Liang Xiao, Wen Meng, Shiyao Wang, Dan Liu, Deyu Qu, Zhizhong Xie, Bohua Deng, Jinping Liu
Understanding the effects of structural properties on the lithium storage behavior of mesoporous TiO2 is crucial for further optimizing its performance through rational structure design. To achieve this, herein, the surface area and the grain size of the prepared mesoporous TiO2 are intentionally adjusted by controlling the calcination temperatures. It is found that the capacities of the mesoporous TiO2 contain both the lithium-ion insertion into the bulk phase (Qin) and the additional surface lithium storage (Qas)...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28522986/retinal-ganglion-cells-and-circadian-rhythms-in-alzheimer-s-disease-parkinson-s-disease-and-beyond
#10
REVIEW
Chiara La Morgia, Fred N Ross-Cisneros, Alfredo A Sadun, Valerio Carelli
There is increasing awareness on the role played by circadian rhythm abnormalities in neurodegenerative disorders such as Alzheimer's disease (AD) and Parkinson's disease (PD). The characterization of the circadian dysfunction parallels the mounting evidence that the hallmarks of neurodegeneration also affect the retina and frequently lead to loss of retinal ganglion cells (RGCs) and to different degrees of optic neuropathy. In the RGC population, there is the subgroup of cells intrinsically photosensitive and expressing the photopigment melanopsin [melanopsin-containing retinal ganglion cells (mRGCs)], which are now well known to drive the entrainment of circadian rhythms to the light-dark cycles...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28522573/lenalidomide-melphalan-dexamethasone-in-newly-diagnosed-patients-with-al-amyloidosis-results-of-a-prospective-phase-2-study-with-long-term-follow-up
#11
Ute Hegenbart, Tilmann Bochtler, Axel Benner, Natalia Becker, Christoph Kimmich, Arnt V Kristen, Jörg Beimler, Ernst Hund, Markus Zorn, Anja Freiberger, Marianne Gawlik, Hartmut Goldschmidt, Dirk Hose, Anna Jauch, Anthony D Ho, Stefan O Schönland
Chemotherapy in light chain amyloidosis aims to normalize the involved free light chain in serum, which leads to an improvement or at least stabilization of organ function in most responding patients. We performed a prospective single center phase 2 trial with 50 untreated patients not eligible for high-dose treatment. The treatment schedule comprised 6 cycles of oral lenalidomide, melphalan and dexamethasone every 4 weeks. After 6 months complete remission was achieved in 9 patients (18%), very good partial remission in 16 (32%) and partial response in 9 (18%)...
May 18, 2017: Haematologica
https://www.readbyqxmd.com/read/28522324/non-invasive-three-dimensional-imaging-of-escherichia-coli-k1-infection-using-diffuse-light-imaging-tomography-combined-with-micro-computed-tomography
#12
REVIEW
Luci A Witcomb, Julie Czupryna, Kevin P Francis, Gad Frankel, Peter W Taylor
In contrast to two-dimensional bioluminescence imaging, three dimensional diffuse light imaging tomography with integrated micro-computed tomography (DLIT-μCT) has the potential to realise spatial variations in infection patterns when imaging experimental animals dosed with derivatives of virulent bacteria carrying bioluminescent reporter genes such as the lux operon from the bacterium Photorhabdus luminescens. The method provides an opportunity to precisely localise the bacterial infection sites within the animal and enables the generation of four-dimensional movies of the infection cycle...
May 15, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28521375/a-genetic-marker-associated-with-shoulder-dislocation
#13
Stuart Kim, John P Kleimeyer, Marwa A Ahmed, Andy L Avins, Michael Fredericson, Jason L Dragoo, John P A Ioannidis
Shoulder dislocations are common shoulder injuries associated with athletic activity in contact sports, such as football, rugby, wrestling, and hockey. Identifying genetic loci associated with shoulder dislocation could shed light on underlying mechanisms for injury and identify predictive genetic markers. To identify DNA polymorphisms associated with shoulder dislocation, a genome-wide association screen was performed using publically available data from the Research Program in Genes, Environment and Health including 662 cases of shoulder dislocation and 82 602 controls from the European ancestry group...
May 18, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28521091/non-magnetic-quantum-emitters-in-boron-nitride-with-ultra-narrow-and-sideband-free-emission-spectra
#14
Xiangzhi Li, Gabriella Donna Shepard, Andrew Cupo, Nicolas Camporeale, Kamran Shayan, Yue Luo, Vincent Meunier, Stefan Strauf
Hexagonal boron nitride (hBN) is an emerging material in nanophotonics and an attractive host for color centers for quantum photonic devices. Here we show that optical emission from individual quantum emitters in hBN is spatially correlated with structural defects and can display ultra-narrow zero-phonon linewidth down to 45 μeV if spectral diffusion is effectively eliminated by proper surface passivation. We demonstrate that undesired emission into phonon sidebands is largely absent for this type of emitter...
May 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28516845/activity-and-functional-properties-of-the-isocitrate-lyase-in-the-cyanobacterium-cyanothece-sp-pcc-7424
#15
Marianne Gründel, Henning Knoop, Ralf Steuer
Cyanobacteria are ubiquitous photoautotrophs that assimilate atmospheric CO2 as their main source of carbon. Several cyanobacteria are known to be facultative heterotrophs that are able to grow on diverse carbon sources. For selected strains, assimilation of organic acids and mixotrophic growth on acetate has been reported for decades. However, evidence for the existence of a functional glyoxylate shunt in cyanobacteria has long been contradictory and unclear. Genes coding for isocitrate lyase (ICL) and malate synthase were recently identified in two strains of the genus Cyanothece, and the existence of the complete glyoxylate shunt was verified in a strain of Chlorogloeopsis fritschii...
May 18, 2017: Microbiology
https://www.readbyqxmd.com/read/28516456/description-of-embryonic-development-and-ultrastructure-in-miracidia-of-cardiocephaloides-longicollis-digenea-strigeidae-in-relation-to-active-host-finding-strategy-in-a-marine-environment
#16
Ana Born-Torrijos, Astrid S Holzer, Juan A Raga, Gabrielle S van Beest, Aneta Yoneva
The functional ultrastructure and embryonic development of miracidia in naturally released eggs of the trematode Cardiocephaloides longicollis were studied using light and transmission electron microscopy. This species has operculated eggs and embryogenesis occurs in the marine environment before an actively infecting ciliated miracidium hatches. Six different developmental stages were identified. The lack of pores in the eggshell indicates its impermeability and the miracidium's dependency on glycogen nutritive reserves, contained in numerous vitellocytes in early embryos...
May 17, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28515777/experimental-evolution-to-increase-the-efficacy-of-the-entomopathogenic-fungus-beauveria-bassiana-against-malaria-mosquitoes-effects-on-mycelial-growth-and-virulence
#17
Claudio A Valero-Jiménez, Jan A L van Kan, Constantianus J M Koenraadt, Bas J Zwaan, Sijmen E Schoustra
Entomopathogenic fungi such as Beauveria bassiana are currently considered as a potential control agent for malaria mosquitoes. The success of such strategies depends among others on the efficacy of the fungus to kill its hosts. As B. bassiana can use various resources for growth and reproduction, increasing the dependency on mosquitoes as a nutritional source may be instrumental for reaching this goal. Passage of entomopathogenic fungi through an insect host has been shown to increase its virulence. We evaluated the virulence, fungal outgrowth, mycelial growth rate, and sporulation rate of two B...
June 2017: Evolutionary Applications
https://www.readbyqxmd.com/read/28515237/increasing-the-illumination-slowly-over-several-weeks-protects-against-light-damage-in-the-eyes-of-the-crustacean-mysis-relicta
#18
Martta L M Viljanen, Noora E Nevala, Cecilia L Calais-Granö, K Magnus W Lindström, Kristian Donner
The eyes of two glacial-relict populations of opossum shrimp Mysis relicta inhabiting the different photic environments of a deep, dark-brown freshwater lake and a variably lit bay of the Baltic Sea differ in their susceptibility to functional depression from strong light exposures. The lake population is much more vulnerable than the sea population. We hypothesized that the difference reflects physiological adaptation mechanisms operating on long time scales rather than genetically fixed differences between the populations...
May 17, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28514122/-is-anti-thrombotic-prophylaxis-warranted-in-fertility-and-in-vitro-fertilization-treatments
#19
REVIEW
Enav Yefet, Amir Weiss
INTRODUCTION: Assisted reproductive technology (ART) treatments are potential risk factors for thromboembolism (TE) due to excessive estrogen levels. Recently, several studies have shed new light on this matter. AIMS: To review the literature to assess the risk for TE during ART and to establish guidelines regarding thrombophylaxis. METHODS: A search was conducted of PubMed, Medline, Cochrane and clinicaltrials.gov. The search terms were fertility, assisted reproductive technology, IVF, thromboembolism, thrombosis and anticoagulation...
July 2016: Harefuah
https://www.readbyqxmd.com/read/28513605/picocyanobacteria-and-deep-ocean-fluorescent-dissolved-organic-matter-share-similar-optical-properties
#20
Zhao Zhao, Michael Gonsior, Jenna Luek, Stephen Timko, Hope Ianiri, Norbert Hertkorn, Philippe Schmitt-Kopplin, Xiaoting Fang, Qinglu Zeng, Nianzhi Jiao, Feng Chen
Marine chromophoric dissolved organic matter (CDOM) and its related fluorescent components (FDOM), which are widely distributed but highly photobleached in the surface ocean, are critical in regulating light attenuation in the ocean. However, the origins of marine FDOM are still under investigation. Here we show that cultured picocyanobacteria, Synechococcus and Prochlorococcus, release FDOM that closely match the typical fluorescent signals found in oceanic environments. Picocyanobacterial FDOM also shows comparable apparent fluorescent quantum yields and undergoes similar photo-degradation behaviour when compared with deep-ocean FDOM, further strengthening the similarity between them...
May 17, 2017: Nature Communications
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