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https://www.readbyqxmd.com/read/28448911/adsorption-of-polar-organic-molecules-on-sediments-case-study-on-callovian-oxfordian-claystone
#1
S Rasamimanana, G Lefèvre, R V H Dagnelie
The release and transport of anthropogenic organic matter through the geosphere is often an environmental criterion of safety. Sedimentary rocks are widely studied in this context as geological barriers for waste management. It is the case of Callovian-Oxfordian claystone (COx), for which several studies report adsorption of anthropogenic organic molecules. In this study, we evaluated and reviewed adsorption data of polar organic molecules on COx claystone. Experiments were performed on raw claystone, decarbonated and clay fractions...
April 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/28448830/biogenesis-of-secondary-mycogenic-minerals-related-to-wall-paintings-deterioration-process
#2
Nikola Unković, Suzana Erić, Kristina Šarić, Miloš Stupar, Željko Savković, Slaviša Stanković, Olja Stanojević, Ivica Dimkić, Jelena Vukojević, Milica Ljaljević Grbić
Present study addresses potential of fungal strains, isolated from deteriorated mural paintings and surrounding air environment of the Church of the Holy Ascension in Veliki Krčimir (Serbia), to precipitate mycogenic minerals, when cultivated on agarized B4 medium. Utilizing culture-based isolation methods, 38 filamentous fungi were obtained in total, 23 from mural paintings and 15 from air, respectively, mainly ascomycetes, while Bjerkandera adusta and Thanatephorus cucumeris were only basidiomycetes. A total of 31 of 38 fungal isolates, more than 80%, were able to form minerals of different morphologies and variable size, determined via SEM-EDS and XRPD, to be either calcite or calcite and weddellite association...
April 19, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28446830/bryophyllum-pinnatum-leaf-extracts-prevent-formation-of-renal-calculi-in-lithiatic-rats
#3
Mahendra Yadav, Vijay D Gulkari, Manish M Wanjari
BACKGROUND: Bryophyllum pinnatum, commonly known as Pattharcaṭṭa, is used traditionally in ethnomedicinal practices for the treatment of kidney stone and urinary insufficiency. AIM: The present study evaluated the effect of Bryophyllum pinnatum on ethylene glycol (EG)-induced renal calculi in rats. MATERIALS AND METHODS: Renal calculi were induced in rats by administration of 0.75% EG in drinking water and co-treated orally with standard drug, Cystone (750 mg/kg), or alcoholic and hydro-alcoholic extracts in doses of 100, 200 and 400 mg/kg for 28 days...
October 2016: Ancient Science of Life
https://www.readbyqxmd.com/read/28442375/implication-of-hyperoxaluria-on-osteopontin-and-er-stress-mediated-apoptosis-in-renal-tissue-of-rats
#4
Rishi Bhardwaj, Ankita Bhardwaj, Chanderdeep Tandon, Devinder K Dhawan, Rakesh Kumar Bijarnia, Tanzeer Kaur
Hyperoxaluria is a stress that leads to calcium oxalate crystal deposition which further causes inflammation and renal cell necroptosis. Many studies have linked osteopontin expression with apoptosis and inflammation but so far its association with apoptosis with regard to hyperoxaluria is undiscovered. Moreover, a recent report has suggested that osteopontin induces endoplasmic reticulum stress and subsequently apoptosis in myocytes. In this study, the impact of hyperoxaluria on the modulation of osteopontin expression and endoplasmic reticulum (ER) stress mediated apoptosis in rats is explored...
April 22, 2017: Experimental and Molecular Pathology
https://www.readbyqxmd.com/read/28439568/bariatric-surgery-and-kidney-related-outcomes
#5
Alex R Chang, Morgan E Grams, Sankar D Navaneethan
The prevalence of severe obesity in both the general and the chronic kidney disease (CKD) populations continues to rise, with more than one-fifth of CKD patients in the United States having a body mass index of ≥35 kg/m(2). Severe obesity has significant renal consequences, including increased risk of end-stage renal disease (ESRD) and nephrolithiasis. Bariatric surgery represents an effective method for achieving sustained weight loss, and evidence from randomized controlled trials suggests that bariatric surgery is also effective in improving blood pressure, reducing hyperglycemia, and even inducing diabetes remission...
March 2017: KI Reports
https://www.readbyqxmd.com/read/28439296/oxidation-of-a-non-phenolic-lignin-model-compound-by-two-irpex-lacteus-manganese-peroxidases-evidence-for-implication-of-carboxylate-and-radicals
#6
Xing Qin, Xianhua Sun, Huoqing Huang, Yingguo Bai, Yuan Wang, Huiying Luo, Bin Yao, Xiaoyu Zhang, Xiaoyun Su
BACKGROUND: Manganese peroxidase is one of the Class II fungal peroxidases that are able to oxidize the low redox potential phenolic lignin compounds. For high redox potential non-phenolic lignin degradation, mediators such as GSH and unsaturated fatty acids are required in the reaction. However, it is not known whether carboxylic acids are a mediator for non-phenolic lignin degradation. RESULTS: The white rot fungus Irpex lacteus is one of the most potent fungi in degradation of lignocellulose and xenobiotics...
2017: Biotechnology for Biofuels
https://www.readbyqxmd.com/read/28436822/distinguishing-homogeneous-heterogeneous-degradation-of-norfloxacin-in-a-photochemical-fenton-like-system-fe3o4-uv-oxalate-and-the-interfacial-reaction-mechanism
#7
Mingjie Huang, Tao Zhou, Xiaohui Wu, Juan Mao
This study demonstrated the efficient degradation of a typical bio-refractory antibiotic norfloxacin (NOR) in a photochemical iron oxides/oxalate system adopting magnetic catalyst (Fe3O4/UV/Ox). It was found that the in-situ generated HO was the main reactive oxygen species (ROS) but CO2(-) could also participate in the NOR degradation to form formylate organic intermediates. Besides, NOR would be degraded via an interesting pathway comprising an initial lag and a subsequent rapid period, where the former could be eliminated by introducing the pre-dissolution of Fe3O4 particles...
March 6, 2017: Water Research
https://www.readbyqxmd.com/read/28435765/chronic-nephropathy-from-dietary-hyperoxaluria-sustained-improvement-of-renal-function-after-dietary-intervention
#8
Yijuan Sun, Bruce L Horowitz, Karen S Servilla, Joanna R Fair, Darlene Vigil, Kavitha Ganta, Larry Massie, Antonios H Tzamaloukas
A 56-year-old man with stable chronic kidney disease (CKD) for two years following a single episode of calcium oxalate urolithiasis developed progressive elevation of his serum creatinine concentration. Urinalysis revealed pyuria and white cell casts, a few red blood cells, minimal proteinuria, and no crystals. Urine culture was sterile. Gallium scintigraphy was consistent with interstitial nephritis. Proton pump inhibitor intake was discontinued, and a short course of oral corticosteroids was initiated. Percutaneous kidney biopsy, performed because of the continued deterioration of renal function to a minimum estimated glomerular filtration rate (eGFR) value of 15 mL/min per 1...
March 20, 2017: Curēus
https://www.readbyqxmd.com/read/28433901/significantly-enhanced-enzymatic-hydrolysis-of-rice-straw-via-a-high-performance-two-stage-deep-eutectic-solvents-synergistic-pretreatment
#9
Xue-Dan Hou, Guo-Jian Feng, Mei Ye, Chao-Mei Huang, Yi Zhang
A two-stage deep eutectic solvents (DESs) treatment was shown to be an effective method for improving the utilization of certain DESs, and the specific order of pretreatment, such as malic acid/proline (MP) or choline chloride/oxalic acid (CO) during the first stage and choline chloride/urea (CU) during the second stage, resulted in better performance for enhancing the sugar yield due to the synergistic effect of the two DESs on biomass fractionation. Moreover, the presence of water during these processes could balance the loss of components by tuning the pretreatment severity, thus ensuring higher sugar yields...
April 9, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28428993/from-nano-to-microcrystals-effects-of-different-synthetic-pathways-on-the-defect-architecture-in-heavily-gd-doped-ceria
#10
M Coduri, M Scavini, M Pani, M M Carnasciali, H Klein, C Artini
The evolution of the defect structure and microstructure of heavily Gd-doped ceria (Ce1-μREμO2-y, 0.313 ≤ μ ≤ 0.438) for different synthetic pathways is investigated here to explore the way defects interact with each other in a composition range known to effectively hamper the application of the material as an electrolyte. Synchrotron radiation powder diffraction is exploited by combining conventional Rietveld analysis with the Pair Distribution Function to get a multiscale picture of defect structures, and it is combined with Raman spectroscopy to assess local scale interactions...
April 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28427913/predicting-the-stone-composition-of-children-preoperatively-by-hounsfield-unit-detection-on-non-contrast-computed-tomography
#11
Mesut Altan, Burak Çitamak, Ali Cansu Bozaci, Altan Güneş, Hasan Serkan Doğan, Mithat Haliloğlu, Serdar Tekgül
INTRODUCTION: Many studies have been performed on adult patients to reveal the relationship between Hounsfield unit (HU) value and composition of stone, but none have focused on childhood. OBJECTIVE: We aimed to predict stone composition by HU properties in pre-intervention non-contrast computed tomography (NCCT) in children. This could help to orient patients towards more successful interventions. MATERIALS AND METHODS: Data of 94 children, whose pre-intervention NCCT and post-interventional stone analysis were available were included...
March 31, 2017: Journal of Pediatric Urology
https://www.readbyqxmd.com/read/28427449/urolithiasis-analysis-in-a-multiethnic-population-at-a-tertiary-hospital-in-nairobi-kenya
#12
Francis K Wathigo, Alfred Hayombe, Daniel Maina
BACKGROUND: Urolithiasis is a global problem whose incidence is reported to be on the rise across the world. Previously, urolithiasis was reported as being rare among the indigenous African population but recent data suggest otherwise. This study reviewed the demographic and clinical characteristics of patients with urolithiasis seen at the Aga Khan University hospital Nairobi (AKUHN) as well as the chemical composition of the stones and the modalities of therapy used. METHODS: This was a retrospective study which utilized patients' clinical and laboratory records from 2013 to 2014...
April 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28426209/channel-assisted-proton-conduction-behavior-in-hydroxyl-rich-lanthanide-based-magnetic-metal-organic-frameworks
#13
Soumava Biswas, Jayita Chakraborty, Vijay Singh Parmar, Siba Prasad Bera, Nirmal Ganguli, Sanjit Konar
Two new lanthanide-based 3D metal-organic frameworks (MOFs), {[Ln(L)(Ox)(H2O)]n·xH2O} [Ln = Gd(3+) and x = 3 (1) and Dy(3+) and x = 1.5 (2); H2L = mucic acid; OxH2 = oxalic acid] showing interesting magnetic properties and channel-mediated proton conduction behavior, are presented here. Single-crystal X-ray structure analysis shows that, in complex 1, the overall structure originates from the mucate-bridged gadolinium-based rectangular metallocycles. The packing view reveals the presence the two types of hydrophilic 1D channels filled with lattice water molecules, which are strongly hydrogen-bonded with coordinated water along the a and b axes, whereas for complex 2, the 3D framework originates from a carboxylate-bridged dysprosium-based criss-cross-type secondary building block...
April 20, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28425514/a-fe5c2-nanocatalyst-for-the-preferential-synthesis-of-ethanol-via-dimethyl-oxalate-hydrogenation
#14
Jia He, Yujun Zhao, Yue Wang, Junhu Wang, Jian Zheng, Hanlei Zhang, Guangwen Zhou, Chongmin Wang, Shengping Wang, Xinbin Ma
A Fe-based catalyst exhibits extremely high selectivity (89.6%) besides excellent catalytic activity in gas-phase dimethyl oxalate hydrogenation. The ethanol formation occurs via hydrogenation of methyl acetate instead of ethylene glycol over the active species Fe5C2.
April 20, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28422036/physicochemical-factors-of-the-urine-of-children-with-hypercalciuria
#15
Mercedes Ubetagoyena-Arrieta, Jorge Martínez Sáenz de Jubera, María Nieves Corera-Casty, Eduardo González Pérez-Yarza, Irati García-Albizua
OBJECTIVE: Hypercalciuria is a common lithogenic risk factor. The aim of this study was, first, to study the characteristics of urine biochemical factors of children with hypercalciuria (HC) and compare them with those of children without hypercalciuria. Second, to analyze the differences between children with HC and lithiasis (HCL) and children with HC and no lithiasis (HCNL). METHODS: The sample was composed by 111 cases with HC, divided into 2 groups: HCNL group, consisting of 93 cases with no personal history of kidney stones, and HCL group, 18 cases with personal history of kidney stones...
April 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28421629/synergistic-effect-of-boron-doped-carbon-nanotubes-supported-cu-catalyst-for-selective-hydrogenation-of-dimethyl-oxalate-to-ethanol
#16
Peipei Ai, Minghui Tan, Noriyuki Yamane, Guoguo Liu, Ronggang Fan, Guohui Yang, Yoshiharu Yoneyama, Ruiqin Yang, Noritatsu Tsubaki
Heteroatom doping is a promising approach to improve the properties of carbon material for customized applications. Herein, a series of boron-doped carbon nanotubes supported Cu catalysts (Cu/xB-CNTs) were prepared for the hydrogenation of dimethyl oxalate to ethanol. The structure and chemical properties of boron doped catalysts were characterized by XRD, TEM, N2O pulse adsorption, CO chemisorption, H2-TPR and NH3-TPD, which revealed that doping boron into CNTs support improved the Cu dispersion, strengthened the interaction of Cu species with CNTs support, introduced more surface acid sites and elevated surface area of both Cu0 and Cu+ sites, especially the surface area of Cu+ sites...
April 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28418357/-renal-morphological-changes-in-experimental-oxalate-nephrolithiasis
#17
Yu G Motin, A V Lepilov, P M Larionov
AIM: Тo evaluate renal morphological changes in the early stages of lithogenic processes and during urinary correction of urine with oxalate-chelating compounds (sodium citrate). MATERIAL AND METHODS: An experimental model of oxalate nephrolithiasis was performed on 80 male Wistar rats weighing 180 to 250 g. Rat kidneys were morphologically and ultrastructurally studied. Immunohistochemical techniques were applied to study the features of development of endoplasmic reticulum stress...
2017: Arkhiv Patologii
https://www.readbyqxmd.com/read/28412486/removal-of-toxic-metals-from-vanadium-contaminated-soils-using-a-washing-method-reagent-selection-and-parameter-optimization
#18
Jianguo Jiang, Meng Yang, Yuchen Gao, Jiaming Wang, Dean Li, Tianran Li
Vanadium (V) contamination in soils is an increasing worldwide concern facing human health and environmental conservation. The fractionation of a metal influences its mobility and biological toxicity. We analyzed the fractionations of V and several other metals using the BCR three-step sequential extraction procedure. Among methods for removing metal contamination, soil washing is an effective permanent treatment. We conducted experiments to select the proper reagents and to optimize extraction conditions. Citric acid, tartaric acid, oxalic acid, and Na2EDTA all exhibited high removal rates of the extractable state of V...
March 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28410252/molecular-modifiers-of-kidney-stones
#19
Bryan G Alamani, Jeffrey D Rimer
PURPOSE OF REVIEW: This review discusses the role of molecular modifiers as inhibitors of kidney stone formation, drawing largely from in-vitro evidence while also citing relevant in-vivo studies. An emphasis is placed on physical observations of crystal growth inhibition, including mechanisms of action that focus predominantly on the literature of calcium oxalate and L-cystine. RECENT FINDINGS: The last decade has witnessed several breakthroughs in the identification of molecules with promise to curb kidney stone formation, as well as discoveries of the mechanisms by which these molecules (or combinations thereof) function as inhibitors of pathological crystal growth...
April 13, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28408095/scale-up-and-inhibitory-studies-on-productivity-of-lipase-from-acinetobacter-radioresistens-pr8
#20
Krishna Kant Gupta, Anshul Nigam, Sharmili Jagtap, Ramadas Krishna
Acinetobacter radioresistens PR8 produces extracellular lipase depending upon growth media. In present work we not only screened the nutrient sources but also investigated the causes for variation in productivity. The nutrient sources investigated are, groundnut oil, groundnut cake and fresh groundnut. Lower lipase productivity was observed on fresh ground nut in contrast to groundnut oil and groundnut cake. The lipase productivity was examined in the batch and parameters monitored were bacterial growth, enzyme activity, pH, lipids and protein concentration...
April 10, 2017: Journal of Bioscience and Bioengineering
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