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https://www.readbyqxmd.com/read/28494340/simple-and-rapid-quantification-of-vancomycin-in-serum-urine-and-peritoneal-pleural-effusion-via-uhplc-ms-ms-applicable-to-personalized-antibiotic-dosing-research
#1
Lenka Javorska, Lenka Kujovska Krcmova, Petr Solich, Milan Kaska
Management of the therapy of life-threatening bacterial infection is extremely based on an optimal antibiotic treatment. Achieving the correct vancomycin dosage in blood and target tissues can be complicated in special situations, e.g., where large fluid sequestration and/or acute renal failure occur. A UHPLC-MS/MS method operating in electrospray (ESI) positive ion mode was applied for the determination of vancomycin in serum, urine and peritoneal/pleural effusion. Sample pretreatment was composed of dilution and simple protein precipitation where only a small volume (50μL) of serum, urine or peritoneal/pleural effusion was required...
May 2, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28375492/the-employed-neurosurgeon-essential-lessons
#2
Deborah L Benzil, Edie E Zusman
Neurosurgeons are highly specialized surgeons whose pride is mastery of the complexity of form and function that is the nervous system and then knowing when and how these require surgical intervention. Following years of arduous postgraduate education, neurosurgeons enter the world of practice that is not only daunting in its intricacies of regulations, mandates, and unknown business practices, but also changing at a meteoric pace. Overwhelmingly, graduating residents and fellows are choosing to practice as employed physicians, a trend that is new in its magnitude and also changed because of the rapid evolution of large health systems...
April 1, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28292905/computational-investigation-of-surface-freezing-in-a-molecular-model-of-water
#3
Amir Haji-Akbari, Pablo G Debenedetti
Water freezes in a wide variety of low-temperature environments, from meteors and atmospheric clouds to soil and biological cells. In nature, ice usually nucleates at or near interfaces, because homogenous nucleation in the bulk can only be observed at deep supercoolings. Although the effect of proximal surfaces on freezing has been extensively studied, major gaps in understanding remain regarding freezing near vapor-liquid interfaces, with earlier experimental studies being mostly inconclusive. The question of how a vapor-liquid interface affects freezing in its vicinity is therefore still a major open question in ice physics...
March 28, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28286925/cabozantinib-for-renal-cell-carcinoma-current-and-future-paradigms
#4
REVIEW
Ahmed Abdelaziz, Ulka Vaishampayan
Cabozantinib was approved by the FDA in April 2016 for the treatment of advanced renal cancer, pretreated with at least one prior antiangiogenic therapy. This is the first agent in the therapy of kidney cancer to show a statistically significant improvement in all three endpoints of clinical efficacy, response rate, progression free survival, and overall survival (OS), in a phase III randomized trial. The reporting of METEOR coincided with that of the Checkmate 025 study which randomized similarly eligible patients to receive nivolumab or everolimus 10 mg daily...
March 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/28212351/black-box%C3%A2-gastrointestinal%C3%A2-tract-needs%C3%A2-and%C3%A2-prospects%C3%A2-of%C3%A2-gaining%C3%A2-insights%C3%A2-of%C3%A2-fate%C3%A2-of%C3%A2-fat-%C3%A2-protein-%C3%A2-and%C3%A2-starch%C3%A2-in%C3%A2-case%C3%A2-of%C3%A2-exocrine%C3%A2-pancreatic%C3%A2-insufficiency%C3%A2-by%C3%A2-using%C3%A2-fistulated%C3%A2-pigs
#5
REVIEW
Anne Mößeler, Josef Kamphues
Exocrine pancreatic insufficiency (EPI) results in the maldigestion and malabsorption of nutrients. The digestive processes in humans and other monogastric species like rat and pig are characterized by a predominantly enzymatic digestion within the small intestine and microbial fermentation located in the hindgut. For protein, it is doctrine that only prececally absorbed amino acids can be transferred to the amino acid pool of the host, while postileal absorption of nitrogen-containing compounds occurs mainly in the form of ammonia, being a burden rather than a benefit for the organism...
February 16, 2017: Nutrients
https://www.readbyqxmd.com/read/28076968/influence-of-southwest-monsoons-in-the-kashmir-valley-western-himalayas
#6
Ghulam Jeelani, Rajendrakumar D Deshpande, Rouf A Shah, Wasim Hassan
The regional climate of the Himalayas is predominated by the southwest monsoons and the western disturbances. The uplift of the Pir Panjal to its present height is believed to restrict the southwest monsoons from entering into the Kashmir Valley in the western Himalayas. In the present study, monthly precipitation samples were collected across the Kashmir Valley from June 2013 to May 2014 for δ(18)O and δ(2)H analyses to constrain the influence of southwest monsoons in the valley. Except in August, the precipitation is enriched in (18)O and (2)H from June to September and depleted from October to May...
August 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/28043939/associations-among-meniscal-damage-meniscal-symptoms-and-knee-pain-severity
#7
L A MacFarlane, H Yang, J E Collins, A Guermazi, M H Jones, E Teeple, L Xu, E Losina, J N Katz
OBJECTIVE: Meniscal tears occur frequently in patients with knee osteoarthritis (OA). The aim of our study was to determine whether meniscal damage identified on magnetic resonance imaging (MRI) is associated with the severity of knee pain or the frequency of meniscal symptoms in patients with knee OA. METHODS: We performed a cross-sectional study using data from the Meniscal Tear in Osteoarthritis Research (MeTeOR) trial. We characterized meniscal damage hierarchically as: root tear; maceration; long and short complex or horizontal tears; and simple tears...
June 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27842445/cabozantinib-in-genitourinary-malignancies
#8
REVIEW
Tian Zhang, Se Eun Park, Cierra Hong, Daniel J George
Cabozantinib inhibits a variety of cellular receptors including VEGFR1-3, MET, AXL, RET, FLT3 and KIT. These signaling pathways have been shown to be important in genitourinary malignancies. Along its clinical development, it has shown most activity in advanced renal cell carcinoma; the METEOR study compared cabozantinib to everolimus and showed clinically and statistically significant improvements in both progression-free survival and overall survival. Herein, we review the development of cabozantinib in the genitourinary malignancies of renal cell carcinoma, prostate adenocarcinoma and urothelial carcinoma...
April 2017: Future Oncology
https://www.readbyqxmd.com/read/27790616/a-comprehensive-comparison-of-the-efficacy-and-tolerability-of-racecadotril-with-other-treatments-of-acute-diarrhea-in-adults
#9
REVIEW
Wolfgang Fischbach, Viola Andresen, Marion Eberlin, Tobias Mueck, Peter Layer
Racecadotril is a guideline-recommended treatment to alleviate symptoms of acute diarrhea. A systematic review of randomized studies was performed comparing efficacy and safety of treatment with racecadotril to that with placebo or active treatments in adults. In five double-blind studies, racecadotril and placebo had comparable tolerability, but racecadotril was more effective. This was consistent across multiple efficacy parameters including duration of diarrhea, number of diarrheic stools, abdominal pain, and meteorism; it was also consistent across countries in Africa, Asia, and Europe...
2016: Frontiers in Medicine
https://www.readbyqxmd.com/read/27780100/hydrochemical-characterization-of-a-mine-water-geothermal-energy-resource-in-nw-spain
#10
C Loredo, A Ordóñez, E Garcia-Ordiales, R Álvarez, N Roqueñi, P Cienfuegos, A Peña, N M Burnside
Abandoned and flooded mine networks provide underground reservoirs of mine water that can be used as a renewable geothermal energy source. A complete hydrochemical characterization of mine water is required to optimally design the geothermal installation, understand the hydraulic behavior of the water in the reservoir and prevent undesired effects such as pipe clogging via mineral precipitation. Water pumped from the Barredo-Figaredo mining reservoir (Asturias, NW Spain), which is currently exploited for geothermal use, has been studied and compared to water from a separate, nearby mountain mine and a river that receives mine water discharge and partially infiltrates into the mine workings...
January 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27762201/ten-years-of-meteor-an-international-rheumatoid-arthritis-registry-development-research-opportunities-and-future-perspectives
#11
REVIEW
Sytske Anne Bergstra, Pedro M M C Machado, Rosaline van den Berg, Robert B M Landewé, Tom W J Huizinga
OBJECTIVES: Ten years ago, the METEOR tool was developed to simulate treatment-to-target and create an international research database. The development of the METEOR tool and database, research opportunities and future perspectives are described. METHODS: The METEOR tool is a free, online, internationally available tool in which daily practice visits of all rheumatoid arthritis patients visiting a rheumatologist can be registered. In the tool, disease characteristics, patient- and physician-reported outcomes and prescribed treatment could be entered...
September 2016: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/27733073/first-field-based-observations-of-%C3%AE-2-h-and-%C3%AE-18-o-values-of-event-based-precipitation-rivers-and-other-water-bodies-in-the-dzungarian-gobi-sw-mongolia
#12
Martina Burnik Šturm, Oyunsaikhan Ganbaatar, Christian C Voigt, Petra Kaczensky
For certain remote areas like Mongolia, field-based precipitation, surface and ground water isotopic data are scarce. So far no such data exist for the Mongolian Gobi desert, which hinders the understanding of isotopic fractionation processes in this extreme, arid region. We collected 26 event-based precipitation samples, 39 Bij river samples, and 75 samples from other water bodies in the Dzungarian Gobi in SW Mongolia over a period of 16 months for hydrogen and oxygen stable isotope analysis. δ(2)H and δ(18)O values in precipitation show high seasonal variation and cover an extreme range: 175 ‰ for δ(2)H and 24 ‰ for δ(18)O values...
May 2017: Isotopes in Environmental and Health Studies
https://www.readbyqxmd.com/read/27668138/silicon-chemistry-in-the-mesosphere-and-lower-thermosphere
#13
John M C Plane, Juan Carlos Gómez-Martín, Wuhu Feng, Diego Janches
Silicon is one of the most abundant elements in cosmic dust, and meteoric ablation injects a significant amount of Si into the atmosphere above 80 km. In this study, a new model for silicon chemistry in the mesosphere/lower thermosphere is described, based on recent laboratory kinetic studies of Si, SiO, SiO2, and Si(+). Electronic structure calculations and statistical rate theory are used to show that the likely fate of SiO2 is a two-step hydration to silicic acid (Si(OH)4), which then polymerizes with metal oxides and hydroxides to form meteoric smoke particles...
April 16, 2016: Journal of Geophysical Research. Atmospheres: JGR
https://www.readbyqxmd.com/read/27642186/radar-detectability-studies-of-slow-and-small-zodiacal-dust-cloud-particles-i-the-case-of-arecibo-430-mhz-meteor-head-echo-observations
#14
D Janches, J M C Plane, D Nesvorný, W Feng, D Vokrouhlický, M J Nicolls
Recent model development of the Zodiacal Dust Cloud (ZDC) model (Nesvorný et al. 2010, 2011b) argue that the incoming flux of meteoric material into the Earth's upper atmosphere is mostly undetected by radars because they cannot detect small extraterrestrial particles entering the atmosphere at low velocities due to the relatively small production of electrons. In this paper we present a new methodology utilizing meteor head echo radar observations that aims to constrain the ZDC physical model by ground-based measurements...
November 20, 2014: Astrophysical Journal
https://www.readbyqxmd.com/read/27538751/evaporative-concentration-of-arsenic-in-groundwater-health-and-environmental-implications-la-laguna-region-mexico
#15
Adrián Ortega-Guerrero
High arsenic concentrations in groundwater have been documented in La Laguna Region (LLR) in arid northern Mexico, where arsenic poisoning is both chronic and endemic. A heated debate has continued for decades on its origin. LLR consisted of a series of ancient connected lakes that developed at the end of a topographic depression under closed basin conditions. This study addresses the isotopic, chemical composition of the groundwater and geochemical modeling in the southeasternmost part of the LLR to determine the origin of arsenic...
August 18, 2016: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/27515015/groundwater-flow-and-geochemical-evolution-in-the-central-flinders-ranges-south-australia
#16
Alaa Ahmed, Ian Clark
The chemical characteristics of water in the Oratunga Area, Central Flinders Ranges, South Australia have been used to evaluate and determine the processes controlling water chemistry in addition to the sources of ions. The isotopic analysis results show that the groundwater is mainly meteoric. Based on the rock and water chemistry, ionic ratios, hydrochemical facies and saturation indices, the chemical evolution has been studied. The chemistry of groundwater revealed two types of water. Thus, in high topographic areas, low TDS, bicarbonate and mixed water types are dominated and support a rapid and direct recharge...
August 8, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27490274/assessing-confidence-in-predictions-using-veracity-and-utility-a-case-study-on-the-prediction-of-mammalian-metabolism-by-meteor-nexus
#17
Philip N Judson, Anthony Long, Ernest Murray, Mukesh Patel
A previous paper1 described new metrics, veracity and utility, for assessing the performance of toxicity prediction systems that report confidence in their predictions. Assessing the performance of systems that predict mammalian metabolism is complicated by the absence of comprehensive sets of negative observations and predictions. This paper presents an approach to assessing the performance of such systems using veracity and utility.
May 2015: Molecular Informatics
https://www.readbyqxmd.com/read/27478716/the-near-global-mesospheric-potassium-layer-observations-and-modeling
#18
E C M Dawkins, J M C Plane, M P Chipperfield, W Feng
The meteoric metal layers act as unique tracers of chemistry and dynamics in the upper atmosphere. Existing lidar studies from a few locations show that K exhibits a semiannual seasonality (winter and summer maxima), quite unlike the annual seasonality (winter maximum and summer minimum) seen with Na and Fe. This work uses spaceborne observations made with the Optical Spectrograph and InfraRed Imager System instrument on the Odin satellite to retrieve the near-global K layer for the first time. The satellite data (2004 to mid-2013) are used to validate the implementation of a recently proposed potassium chemistry scheme in a whole atmosphere chemistry climate model, which provides a chemical basis for this semiannual seasonal behavior...
August 16, 2015: Journal of Geophysical Research. Atmospheres: JGR
https://www.readbyqxmd.com/read/27478282/on-the-size-and-velocity-distribution-of-cosmic-dust-particles-entering-the-atmosphere
#19
J D Carrillo-Sánchez, J M C Plane, W Feng, D Nesvorný, D Janches
The size and velocity distribution of cosmic dust particles entering the Earth's atmosphere is uncertain. Here we show that the relative concentrations of metal atoms in the upper mesosphere, and the surface accretion rate of cosmic spherules, provide sensitive probes of this distribution. Three cosmic dust models are selected as case studies: two are astronomical models, the first constrained by infrared observations of the Zodiacal Dust Cloud and the second by radar observations of meteor head echoes; the third model is based on measurements made with a spaceborne dust detector...
August 16, 2015: Geophysical Research Letters
https://www.readbyqxmd.com/read/27439144/local-vs-regional-groundwater-flow-delineation-from-stable-isotopes-at-western-north-america-springs
#20
Abraham E Springer, Elizabeth M Boldt, Katie M Junghans
The recharge location for many springs is unknown because they can be sourced from proximal, shallow, atmospheric sources or long-traveled, deep, regional aquifers. The stable isotope ((18) O and (2) H) geochemistry of springs water can provide cost-effective indications of relative flow path distance without the expense of drilling boreholes, conducting geophysical studies, or building groundwater flow models. Locally sourced springs generally have an isotopic signature similar to local precipitation for that region and elevation...
January 2017: Ground Water
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