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https://www.readbyqxmd.com/read/29140292/anisotropic-failure-strength-of-shale-with-increasing-confinement-behaviors-factors-and-mechanism
#1
Cheng Cheng, Xiao Li, Haitao Qian
Some studies reported that the anisotropic failure strength of shale will be weakened by increasing confinement. In this paper, it is found that there are various types of anisotropic strength behaviors. Four types of anisotropic strength ratio ( S A 1 ) behaviors and three types of anisotropic strength difference ( S A 2 ) behaviors have been classified based on laboratory experiments on nine groups of different shale samples. The cohesion c w and friction angle ϕ w of the weak planes are proven to be two dominant factors according to a series of bonded-particle discrete element modelling analyses...
November 15, 2017: Materials
https://www.readbyqxmd.com/read/29140085/electronic-structure-of-anilinopyridinate-supported-ru2-5-paddlewheel-compounds
#2
Amanda R Corcos, Michael D Roy, Michelle M Killian, Stephanie Dillon, Thomas C Brunold, John F Berry
The electronic structures of the diruthenium compounds Ru2(ap)4Cl (1, ap = 2-anilinopyridinate) and Ru2(ap)4OTf (2) were investigated with UV-vis, resonance Raman, and magnetic circular dichroism (MCD) spectroscopies; SQUID magnetometry; and density functional theory (DFT) calculations. Both compounds have quartet spin ground states with large axial zero-field splitting of ∼60 cm(-1) that is characteristic of Ru2(5+) compounds having a (π*, δ*)(3) electron configuration and a Ru-Ru bond order of ∼2.5...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29137281/hic-5-regulates-epithelial-to-mesenchymal-transition-in-ovarian-cancer-cells-in-a-tgf%C3%AE-1-independent-manner
#3
Razan Sheta, Zhi-Qiang Wang, Magdalena Bachvarova, Marie Plante, Jean Gregoire, Marie-Claude Renaud, Alexandra Sebastianelli, Stephane Gobeil, Chantale Morin, Elizabeth Macdonald, Barbara Vanderhyden, Dimcho Bachvarov
The molecular basis of epithelial ovarian cancer (EOC) dissemination is still poorly understood. We have previously identified the hydrogen peroxide-inducible clone-5 (Hic-5) gene as hypomethylated in high-grade (HG) serous EOC tumors, compared to normal ovarian tissues. Hic-5 is a focal adhesion scaffold protein and has been primarily studied for its role as a key mediator of TGF-β-induced epithelial-to-mesenchymal transition (EMT) in epithelial cells of both normal and malignant origin; however, its role in EOC has been never investigated...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29136842/application-of-micro-x-ray-fluorescence-and-micro-computed-tomography-to-the-study-of-laser-cleaning-efficiency-on-limestone-monuments-covered-by-black-crusts
#4
Giorgio S Senesi, Ignazio Allegretta, Carlo Porfido, Olga De Pascale, Roberto Terzano
Laser cleaning is widely used to remove black crusts from weathered limestone monuments. The cleaning efficiency is commonly tested using conventional analytical techniques, which do not allow to analyze the same sample before and after the treatment. In this paper, micro computed tomography (μ-CT) and micro X-ray fluorescence spectroscopy (μ-XRF) techniques were used for the first time to evaluate the laser cleaning efficiency on two different encrusted quoins collected from a limestone monument. Analyses were carried out non-destructively on the same portion of the two lithotypes before and after the treatment...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136112/local-production-of-tenascin-c-acts-as-a-trigger-for-monocyte-macrophage-recruitment-that-provokes-cardiac-dysfunction
#5
Dounia Abbadi, Fanny Laroumanie, Mathilde Bizou, Joffrey Pozzo, Danièle Daviaud, Christine Delage, Denis Calise, Fréderique Gaits-Iacovoni, Marianne Dutaur, Florence Tortosa, Edith Renaud-Gabardos, Victorine Douin-Echinard, Anne-Catherine Prats, Jerome Roncalli, Angelo Parini, Nathalie Pizzinat
Aims: Tenascin-C (TNC) is an endogenous danger signal molecule strongly associated with inflammatory diseases and with poor outcome in patients with cardiomyopathies. Its function within pathological cardiac tissue during pressure overload remains poorly understood. Methods and results: We showed that TNC accumulates after 1 week of transverse aortic constriction (TAC) in the heart of 12-week-old male mice. By cross bone marrow transplantation experiments, we determined that TNC deposition relied on cardiac cells and not on haematopoietic cells...
November 10, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/29135700/safety-outcomes-following-spine-and-cranial-neurosurgery-evidence-from-the-national-surgical-quality-improvement-program
#6
Andrew K Rock, Charles F Opalak, Kathryn G Workman, William C Broaddus
BACKGROUND: The American College of Surgeons National Surgical Quality Improvement Program (ACS-NSQIP) was used to establish predictors for 30-day postoperative complications following spine and cranial neurosurgery. MATERIALS AND METHODS: The ACS-NSQIP participant use files were queried for neurosurgical cases between 2005 and 2015. Prevalence of postoperative complications following neurosurgery was determined. Nested multivariable logistic regression analysis was used to identify demographic, comorbidity, and perioperative characteristics associated with any complication and mortality for spine and cranial surgery...
November 10, 2017: Journal of Neurosurgical Anesthesiology
https://www.readbyqxmd.com/read/29135354/depression-following-traumatic-brain-injury-in-mice-is-associated-with-down-regulation-of-hippocampal-astrocyte-glutamate-transporters-by-thrombin
#7
Chun-Shu Piao, Ashley L Holloway, Sue Hong-Routson, Mark S Wainwright
Depression after traumatic brain injury (TBI) is common but the mechanisms by which TBI causes depression are unknown. TBI decreases glutamate transporters GLT-1 and GLAST and allows extravasation of thrombin. We examined the effects of thrombin on transporter expression in primary hippocampal astrocytes. Application of a PAR-1 agonist caused down-regulation of GLT-1, which was prevented by inhibition of Rho kinase (ROCK). To confirm these mechanisms in vivo, we subjected mice to closed-skull TBI. Thrombin activity in the hippocampus increased one day following TBI...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29135301/microbialite-biosignature-analysis-by-mesoscale-x-ray-fluorescence-%C3%AE-xrf-mapping
#8
Michael M Tice, Kimbra Quezergue, Michael C Pope
As part of its biosignature detection package, the Mars 2020 rover will carry PIXL, the Planetary Instrument for X-ray Lithochemistry, a spatially resolved X-ray fluorescence (μXRF) spectrometer. Understanding the types of biosignatures detectable by μXRF and the rock types μXRF is most effective at analyzing is therefore an important goal in preparation for in situ Mars 2020 science and sample selection. We tested mesoscale chemical mapping for biosignature interpretation in microbialites. In particular, we used μXRF to identify spatial distributions and associations between various elements ("fluorescence microfacies") to infer the physical, biological, and chemical processes that produced the observed compositional distributions...
November 2017: Astrobiology
https://www.readbyqxmd.com/read/29134719/temporal-genetic-patterns-of-diversity-and-structure-evidence-chaotic-genetic-patchiness-in-a-spiny-lobster
#9
Cecilia Villacorta-Rath, Carla A Souza, Nicholas P Murphy, Bridget S Green, Caleb Gardner, Jan M Strugnell
Population structure of many marine organisms is spatially patchy and varies within and between years, a phenomenon defined as chaotic genetic patchiness. This results from the combination of planktonic larval dispersal and environmental stochasticity. Additionally, in species with bi-partite life, post-settlement selection can magnify these genetic differences. The high fecundity (up to 500,000 eggs annually) and protracted larval duration (12-24 months) and dispersal of the southern rock lobster, Jasus edwardsii, make it a good test species for chaotic genetic patchiness and selection during early benthic life...
November 13, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29134090/assessment-of-dynamic-material-properties-of-intact-rocks-using-seismic-wave-attenuation-an-experimental-study
#10
W A M Wanniarachchi, P G Ranjith, M S A Perera, T D Rathnaweera, Q Lyu, B Mahanta
The mechanical properties of any substance are essential facts to understand its behaviour and make the maximum use of the particular substance. Rocks are indeed an important substance, as they are of significant use in the energy industry, specifically for fossil fuels and geothermal energy. Attenuation of seismic waves is a non-destructive technique to investigate mechanical properties of reservoir rocks under different conditions. The attenuation characteristics of five different rock types, siltstone, shale, Australian sandstone, Indian sandstone and granite, were investigated in the laboratory using ultrasonic and acoustic emission instruments in a frequency range of 0...
October 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/29133910/time-resolved-diffraction-of-shock-released-sio2-and-diaplectic-glass-formation
#11
A E Gleason, C A Bolme, H J Lee, B Nagler, E Galtier, R G Kraus, R Sandberg, W Yang, F Langenhorst, W L Mao
Understanding how rock-forming minerals transform under shock loading is critical for modeling collisions between planetary bodies, interpreting the significance of shock features in minerals and for using them as diagnostic indicators of impact conditions, such as shock pressure. To date, our understanding of the formation processes experienced by shocked materials is based exclusively on ex situ analyses of recovered samples. Formation mechanisms and origins of commonly observed mesoscale material features, such as diaplectic (i...
November 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/29133878/past-emergent-phase-of-shatsky-rise-deep-marine-igneous-plateau
#12
Moriaki Yasuhara, Atsushi Ando, Yasuhiro Iba
The Cretaceous Period stands out in Earth's geologic history by ubiquitous and sustained massive eruption of lava, forming several enormous igneous plateaus in the ocean basins worldwide. It has been proposed that the subaerial phases of Cretaceous oceanic plateau formation spurred the global environmental deterioration, yet this view is supported by patchy fossil and/or rock evidence for uplifting of the plateau summits above the sea level. Reported here is by far the most comprehensive case of Cretaceous plateau emergence at northern Shatsky Rise, Northwest Pacific, based on the integration of unique micropalaeontological and seismic evidence...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29133567/risk-factors-and-outcomes-associated-with-multidrug-resistant-acinetobacter-baumannii-upon-icu-admission
#13
Natalia Blanco, Anthony D Harris, Clare Rock, J Kristie Johnson, Lisa Pineles, Robert A Bonomo, Arjun Srinivasan, Melinda M Pettigrew, Kerri A Thom
Introduction: Multi-drug resistant (MDR) Acinetobacter baumannii, associated with broad-spectrum antibiotic use, is an important nosocomial pathogen associated with morbidity and mortality. This study aimed to investigate the prevalence of MDR A. baumannii perirectal colonization among adult patients at ICU admission over a 5-year period, and to identify risk factors and outcomes associated with colonization.Methods: A retrospective cohort analysis of patients admitted to the medical (MICU) and surgical intensive care units (SICU) at the University of Maryland Medical Center from May 2005 to September 2009 was performed using perirectal surveillance cultures on admission...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29130932/p120-catenin-is-an-obligate-haploinsufficient-tumor-suppressor-in-intestinal-neoplasia
#14
Sarah P Short, Jumpei Kondo, Whitney G Smalley-Freed, Haruna Takeda, Michael R Dohn, Anne E Powell, Robert H Carnahan, Mary K Washington, Manish Tripathi, D Michael Payne, Nancy A Jenkins, Neal G Copeland, Robert J Coffey, Albert B Reynolds
p120-Catenin (p120) functions as a tumor suppressor in intestinal cancer, but the mechanism is unclear. Here, using conditional p120 knockout in Apc-sensitized mouse models of intestinal cancer, we have identified p120 as an "obligatory" haploinsufficient tumor suppressor. Whereas monoallelic loss of p120 was associated with a significant increase in tumor multiplicity, loss of both alleles was never observed in tumors from these mice. Moreover, forced ablation of the second allele did not further enhance tumorigenesis, but instead induced synthetic lethality in combination with Apc loss of heterozygosity...
November 13, 2017: Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29130345/mir-199a-targeting-rock1-to-affect-kidney-cell-proliferation-invasion-and-apoptosis
#15
Zhigang Qin, Xin Wei, Ning Jin, Yao Wang, Rui Zhao, Yangqing Hu, Weijian Yan, Junke Li, Qiaoling Zhou
Renal cell carcinoma (RCC) is one of the three most common cancers of urinary tract cancer, accounting for 2-3% of all systemic cancers. Recent studies have found that miR-199a is lowly expressed in RCC, may act as a tumour suppressor gene to induce the occurrence of kidney cancer. In the present study, we investigated the role of miR-199a in the progression and metastasis of RCC. The results showed that miR-199a significantly downregulated in RCC and cell lines. Overexpression of miR-199a in RCC cell lines significantly inhibited cell proliferation, migration and invasion...
November 13, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29129589/behavior-of-detoxifying-enzymes-of-aedes-aegypti-exposed-to-girgensohnine-alkaloid-analog-and-cymbopogon-flexuosus-essential-oil
#16
Aurora L Carreño Otero, Angela Maria Palacio-Cortés, Mario Antonio Navarro-Silva, Vladimir V Kouznetsov, Jonny E Duque L
Because mosquito control depend on the use of commercial insecticides and resistance has been described in some of them, there is a need to explore new molecules no resistant. In vivo effects of girgensohnine analog 2-(3,4-dimethoxyphenyl)-2-(piperidin-1-yl)acetonitrile DPPA and Cymbopogon flexuosus essential oil CFEO, on the detoxifying enzymes acetylcholinesterase (AChE), glutathione-S-transferase (GST), nonspecific esterases ( α- and β-), mixed function oxidases (MFO) and p-NPA esterases were evaluated on a Rockefeller (Rock) and wild Aedes aegypti population from Santander, Colombia (WSant)...
November 9, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/29127798/characterization-and-sources-of-colored-dissolved-organic-matter-in-a-coral-reef-ecosystem-subject-to-ultramafic-erosion-pressure-new-caledonia-southwest-pacific
#17
Chloé Martias, Marc Tedetti, François Lantoine, Léocadie Jamet, Cécile Dupouy
The eastern lagoon of New Caledonia (NC, Southwest Pacific), listed as a UNESCO World Heritage site, hosts the world's second longest double-barrier coral reef. This lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel (Ni) and cobalt (Co). The aim of this study was to characterize colored dissolved organic matter (CDOM), as well as to determine its main sources and its possible relationships (through the use of Pearson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the NC eastern lagoon...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29127487/towards-a-unified-understanding-of-lithium-action-in-basic-biology-and-its-significance-for-applied-biology
#18
REVIEW
Eric Jakobsson, Orlando Argüello-Miranda, See-Wing Chiu, Zeeshan Fazal, James Kruczek, Santiago Nunez-Corrales, Sagar Pandit, Laura Pritchet
Lithium has literally been everywhere forever, since it is one of the three elements created in the Big Bang. Lithium concentration in rocks, soil, and fresh water is highly variable from place to place, and has varied widely in specific regions over evolutionary and geologic time. The biological effects of lithium are many and varied. Based on experiments in which animals are deprived of lithium, lithium is an essential nutrient. At the other extreme, at lithium ingestion sufficient to raise blood concentration significantly over 1 mM/, lithium is acutely toxic...
November 10, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/29127400/folded-fabric-tunes-rock-deformation-and-failure-mode-in-the-upper-crust
#19
F Agliardi, M R Dobbs, S Zanchetta, S Vinciguerra
The micro-mechanisms of brittle failure affect the bulk mechanical behaviour and permeability of crustal rocks. In low-porosity crystalline rocks, these mechanisms are related to mineralogy and fabric anisotropy, while confining pressure, temperature and strain rates regulate the transition from brittle to ductile behaviour. However, the effects of folded anisotropic fabrics, widespread in orogenic settings, on the mechanical behaviour of crustal rocks are largely unknown. Here we explore the deformation and failure behaviour of a representative folded gneiss, by combining the results of triaxial deformation experiments carried out while monitoring microseismicity with microstructural and damage proxies analyses...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29127329/urban-seismology-on-the-origin-of-earth-vibrations-within-a-city
#20
Jordi Díaz, Mario Ruiz, Pilar S Sánchez-Pastor, Paula Romero
Urban seismology has become an active research field in the recent years, both with seismological objectives, as obtaining better microzonation maps in highly populated areas, and with engineering objectives, as the monitoring of traffic or the surveying of historical buildings. We analyze here the seismic records obtained by a broad-band seismic station installed in the ICTJA-CSIC institute, located near the center of Barcelona city. Although this station was installed to introduce visitors to earth science during science fairs and other dissemination events, the analysis of the data has allowed to infer results of interest for the scientific community...
November 10, 2017: Scientific Reports
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