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https://www.readbyqxmd.com/read/28644982/assessment-of-sublethal-endpoints-after-chronic-exposure-of-the-nematode-caenorhabditis-elegans-to-palladium-platinum-and-rhodium
#1
Gerhard Schertzinger, Sonja Zimmermann, Daniel Grabner, Bernd Sures
The aim of this study was to investigate chronic effects of the platinum-group elements (PGE) palladium (Pd), platinum (Pt) and rhodium (Rh) on the nematode Caenorhabditis elegans. Aquatic toxicity testing was carried out according to ISO 10872 by determining 96 h EC50 values for sublethal endpoints, including growth, fertility and reproduction. Single PGE standard solutions were used as metal source. Based on the EC50 values for Pt, reproduction (96 h EC50 = 497 μg/L) was the most sensitive endpoint followed by fertility (96 h EC50 = 726 μg/L) and growth (96 h EC50 = 808 μg/L)...
June 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28639372/syntheses-structures-and-solution-studies-of-multi-component-macrocycles-and-cages-based-on-versatile-ligands
#2
Guo-Xin Jin, Ying-Ying Zhang, Wen-Xi Gao, Yue-Jian Lin, Li-Wei Mi
Different types of multinuclear half-sandwich rhodium macrocycles and cages were designed and synthesized by using two similar multifunctional hydroxamate ligands (pyrazine-2-hydroxamic acid (NaHL1) and 4,4'-bipyridine-2-hydroxamic acid (KHL2)) featuring one monodentate site and two pairs of chelating sites. The Rh(III)-Pd(II) heterometallic macrocycles were constructed by using the semi-open palladium(II) source (Pd(en)Cl2) with two free acceptor sites. However, only one kind of macrocycle was found when the shorter ligand L1 was used, while in the larger case, various spectroscopic techniques demonstrated that the coexistence of the hexanuclear and octanuclear macrocyles in solution and the proportions of both components depended on concentration and temperature...
June 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28629012/equilibrium-kinetics-and-mechanism-of-au-3-pd-2-and-ag-ions-adsorption-from-aqueous-solutions-by-graphene-oxide-functionalized-persimmon-tannin
#3
Zhongmin Wang, Xiaojuan Li, Haijun Liang, Jingliang Ning, Zhide Zhou, Guiyin Li
In this study, a novel bio-adsorbent (PT-GO) was prepared by functionalization persimmon tannin (PT) with graphene oxide (GO) and the effective adsorption behaviors of Au(3+), Pd(2+) and Ag(+) ions from aqueous solution was investigated. The PT-GO was characterized by Fourier transform infrared spectrometer (FTIR), scanning electronic microscope (SEM), thermogravimetric analysis (TGA) and Zeta potential. Many influence factors such as pH value, bio-adsorbent dosage, initial concentration of metal ions and contact time were optimized...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628248/kinetic-selectivity-and-thermodynamic-features-of-competitive-imine-formation-in-dynamic-covalent-chemistry
#4
Jean-Marie Lehn, Sirinan Kulchat, Manuel N Chaur
The kinetic and thermodynamic selectivities of imine formation have been investigated for several dynamic covalent libraries of aldehydes and amines. Two systems were examined, involving the reaction of different types of primary amino groups (aliphatic amines, alkoxy-amines, hydrazides and hydrazines) with two types of aldehydes, sulfobenzaldehyde and pyridoxal phosphate in aqueous solution at different pD (5.0, 8.5, 11.4) on one hand, 2-pyridinecarboxaldehyde and salicylaldehyde in organic solvents on the other hand...
June 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28627566/theoretical-study-of-one-electron-oxidized-salen-complexes-of-group-7-mn-iii-tc-iii-and-re-iii-and-group-10-metals-ni-ii-pd-ii-and-pt-ii-with-the-3d-rism-gmc-qdpt-method-localized-vs-delocalized-ground-and-excited-states-in-solution
#5
Shinji Aono, Masayuki Nakagaki, Shigeyoshi Sakaki
One-electron oxidized salen complexes of Mn(iii) and Ni(ii) were recently reported to be unique mixed-valence compounds. Their electronic structures are sensitive to the salen ligand and solvation. We systematically investigated a series of one-electron oxidized salen complexes of group 7 metals (Mn(iii), Tc(iii), and Re(iii)) and their group 10 analogues (Ni(ii), Pd(ii), and Pt(ii)) using the general multi-configuration reference quasi-degenerate perturbation theory (GMC-QDPT) which was combined with the three-dimensional reference interaction site model self-consistent field theory (3D-RISM-SCF) to incorporate the solvation effect...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28624746/textual-properties-and-catalytic-performances-of-halloysite-hybrid-ceo2-zro2-nanoparticles
#6
Jing Ouyang, Zai Zhao, Yi Zhang, Huaming Yang
Halloysite (Hal) hybridized ceria-zirconia solid solution material (CZ-Hal) for three way catalysis was synthesized through co-precipitation method. X-ray diffraction (XRD), N2 adsorption-desorption isotherms, transmission electronic microscopy (TEM), scanning electronic microscopy (SEM), X-ray energy dispersion spectrum (EDS), and temperature-programmed H2 reduction (H2-TPR) were used to characterize the crystalline, textural, morphological, and reducibility of the products. The three way catalytic performances of the supported products was tested in stoichiometric air/fuel condition...
June 9, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28624215/periostin-binding-dna-aptamer-treatment-ameliorates-peritoneal-dialysis-induced-peritoneal-fibrosis
#7
Bo Young Nam, Jung Tak Park, Young Eun Kwon, Jung Pyo Lee, Jong Ha Jung, Youndong Kim, Seonghun Kim, Jimin Park, Jae Eun Um, Meiyan Wu, Seung Hyeok Han, Tae-Hyun Yoo, Shin-Wook Kang
Peritoneal fibrosis is a major complication in peritoneal dialysis (PD) patients, which leads to dialysis discontinuation. Periostin, increased by transforming growth factor β1 (TGF-β1) stimulation, induces the expression of extracellular matrix (ECM) genes. Aberrant periostin expression has been demonstrated to be associated with PD-related peritoneal fibrosis. Therefore, the effect of periostin inhibition by an aptamer-based inhibitor on peritoneal fibrosis was evaluated. In vitro, TGF-β1 treatment upregulated periostin, fibronectin, α-smooth muscle actin (α-SMA), and Snail expression and reduced E-cadherin expression in human peritoneal mesothelial cells (HPMCs)...
June 16, 2017: Molecular Therapy. Nucleic Acids
https://www.readbyqxmd.com/read/28622560/kinetic-and-isotherm-studies-on-adsorption-of-toxic-pollutants-using-porous-zno-sio2-monolith
#8
Manisha Sharma, Satyajit Hazra, Soumen Basu
Removal of toxic effluents (like dyes and pesticides) by cost-effective and user-friendly method is needed to provide sustaining the environment for civilization. Here, low-cost mesoporous silica monolith (SiO2) and silica supported metal-oxide (ZnO@SiO2) monolith were synthesized to reduce the solemn impact of toxic effluents. Batch experiments were performed to remove Alizarin (AZ), Paradol (PD), Acid blue-113 (AB) and Rhodamine-B (RD) from aqueous solution via synthesized monoliths. The influence of various parameters (like pH, contact time, temperature and adsorbate concentration) has been optimized...
June 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28608831/france-s-state-of-the-art-distributed-optical-fibre-sensors-qualified-for-the-monitoring-of-the-french-underground-repository-for-high-level-and-intermediate-level-long-lived-radioactive-wastes
#9
REVIEW
Sylvie Delepine-Lesoille, Sylvain Girard, Marcel Landolt, Johan Bertrand, Isabelle Planes, Aziz Boukenter, Emmanuel Marin, Georges Humbert, Stéphanie Leparmentier, Jean-Louis Auguste, Youcef Ouerdane
This paper presents the state of the art distributed sensing systems, based on optical fibres, developed and qualified for the French Cigéo project, the underground repository for high level and intermediate level long-lived radioactive wastes. Four main parameters, namely strain, temperature, radiation and hydrogen concentration are currently investigated by optical fibre sensors, as well as the tolerances of selected technologies to the unique constraints of the Cigéo's severe environment. Using fluorine-doped silica optical fibre surrounded by a carbon layer and polyimide coating, it is possible to exploit its Raman, Brillouin and Rayleigh scattering signatures to achieve the distributed sensing of the temperature and the strain inside the repository cells of radioactive wastes...
June 13, 2017: Sensors
https://www.readbyqxmd.com/read/28604587/optimization-of-perovskite-gas-sensor-performance-characterization-measurement-and-experimental-design
#10
Francesco Bertocci, Ada Fort, Valerio Vignoli, Marco Mugnaini, Rossella Berni
Eight different types of nanostructured perovskites based on YCoO 3 with different chemical compositions are prepared as gas sensor materials, and they are studied with two target gases NO 2 and CO. Moreover, a statistical approach is adopted to optimize their performance. The innovative contribution is carried out through a split-plot design planning and modeling, also involving random effects, for studying Metal Oxide Semiconductors (MOX) sensors in a robust design context. The statistical results prove the validity of the proposed approach; in fact, for each material type, the variation of the electrical resistance achieves a satisfactory optimized value conditional to the working temperature and by controlling for the gas concentration variability...
June 10, 2017: Sensors
https://www.readbyqxmd.com/read/28593202/feature-selection-based-on-iterative-canonical-correlation-analysis-for-automatic-diagnosis-of-parkinson-s-disease
#11
Luyan Liu, Qian Wang, Ehsan Adeli, Lichi Zhang, Han Zhang, Dinggang Shen
Parkinson's disease (PD) is a major progressive neurodegenerative disorder. Accurate diagnosis of PD is crucial to control the symptoms appropriately. However, its clinical diagnosis mostly relies on the subjective judgment of physicians and the clinical symptoms that often appear late. Recent neuroimaging techniques, along with machine learning methods, provide alternative solutions for PD screening. In this paper, we propose a novel feature selection technique, based on iterative canonical correlation analysis (ICCA), to investigate the roles of different brain regions in PD through T1-weighted MR images...
October 2016: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/28585613/-immunotherapy-of-renal-cell-cancer
#12
Lajos Géczi, Krisztián Nagyiványi, Anikó Maráz
The authors briefly highlight the results of targeted therapy and present new solutions in kidney cancer immunotherapy. The important checkpoint inhibitors (anti-CTLA-4, -PD-1 and -PD-L1/2) and their combinations, together with the combinations of targeted drugs and immunotherapy are discussed. The newest checkpoint agents, vaccination and pegylated interleukin-2 are also presented. The most promising clinical trials (CheckMate-025, AGS-003, IMA 901) and the on-going first line phase III trials are shown in metastatic clear cell renal carcinoma...
June 6, 2017: Magyar Onkologia
https://www.readbyqxmd.com/read/28582968/influence-of-conditions-of-pd-sno2-nanomaterial-formation-on-properties-of-hydrogen-sensors
#13
E V Sokovykh, L P Oleksenko, N P Maksymovych, I P Matushko
Metal oxide sensors were created using nanosized tin dioxide obtained by a sol-gel method. Gas-sensitive layers of the sensors were impregnated with PdCl2 solutions of different concentrations to increase sensitivities of the proposed sensors. Influence of different temperature conditions of the sensor formation on the sensor properties was studied. It was found that decreasing duration of high-temperature sensor treatment prevents enlargement of particles of the gas-sensitive materials. It was shown that the sensors based on materials with smaller particle sizes showed higher sensor responses to 40 ppm H2...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28578286/enhanced-ethanol-electro-oxidation-reaction-on-carbon-supported-pd-metal-oxide-electrocatalysts
#14
R M Abdel Hameed
Various Pd-metal oxide/C electrocatalysts were fabricated using ethylene glycol as a reducing agent in modified microwave-assisted polyol process. The crystal structure and surface morphology were studied using X-ray diffraction and transmission electron microscopy. All prepared Pd-metal oxide/C electrocatalysts exhibited a shift of Pd diffraction planes in the positive direction in relation to that of Pd/C. Highly dispersed palladium nanoparticles were formed on different metal oxide/C supports. The electrocatalytic performance of these electrocatalysts for ethanol oxidation was examined in NaOH solution using cyclic voltammetry, chronoamperometry and electrochemical impedance spectroscopy...
May 26, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28553489/electrochemical-promotion-of-catalysis-over-pd-nanoparticles-for-co2-reduction
#15
Fan Cai, Dunfeng Gao, Hu Zhou, Guoxiong Wang, Ting He, Huimin Gong, Shu Miao, Fan Yang, Jianguo Wang, Xinhe Bao
Electrochemical promotion of catalysis (EPOC) has been shown to accelerate the rate of many heterogeneous catalytic reactions; however, it has rarely been reported in low-temperature aqueous electrochemical reactions. Herein, we report a significant EPOC effect for the CO2 reduction to generate formate over Pd nanoparticles (NPs) in a 1 M KHCO3 aqueous solution. By applying a negative potential over differently-sized Pd NPs, the rate of formate production is greatly improved as compared to that at an open-circuit voltage, with a rate enhancement ratio ranging from 10 to 143...
April 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28551130/reagent-less-amperometric-glucose-biosensor-based-on-a-graphite-rod-electrode-layer-by-layer-modified-with-1-10-phenanthroline-5-6-dione-and-glucose-oxidase
#16
Asta Kausaite-Minkstimiene, Ruta Simanaityte, Almira Ramanaviciene, Laura Glumbokaite, Arunas Ramanavicius
A reagent-less amperometric glucose biosensor operating in not-stirred sample solution was developed. A working electrode of the designed biosensor was based on a graphite rod (GR) electrode, which was modified with 1,10-phenanthroline-5,6-dione (PD) and glucose oxidase (GOx). The PD and the GOx were layer-by-layer adsorbed on the GR electrode surface with subsequent drying followed by chemical cross-linking of the adsorbed GOx with glutaraldehyde (GA). Optimal preparation conditions of the working electrode (GR/PD/GOx) were achieved with 12...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28546366/characteristics-and-clinical-outcomes-of-end-stage-renal-disease-patients-on-peritoneal-dialysis-for-over-15-years-a-single-center-experience
#17
Youn Kyung Kee, Jung Tak Park, Chang-Yun Yoon, Hyoungnae Kim, Seohyun Park, Hae Ryong Yun, Su-Young Jung, Jong Hyun Jhee, Hyung Jung Oh, Seung Hyeok Han, Tae-Hyun Yoo, Shin-Wook Kang
♦Background: Maintaining peritoneal dialysis (PD) for a long time is problematic owing to a number of factors. This study aimed to clarify the characteristics and examine the clinical outcomes of patients who received PD as a long-term dialysis modality. ♦ Methods: All end-stage renal disease (ESRD) patients who initiated PD at Yonsei University Health System between 1987 and 2000 were screened. Patients who maintained PD for over 15 years were classified as the long-term PD group and those who were treated with PD for less than 5 years were included in the short-term PD group...
May 25, 2017: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/28540200/targeting-cannabinoid-signaling-for-peritoneal-dialysis-induced-oxidative-stress-and-fibrosis
#18
REVIEW
Chih-Yu Yang, Yat-Pang Chau, Ann Chen, Oscar Kuang-Sheng Lee, Der-Cherng Tarng, An-Hang Yang
Long-term exposure to bioincompatible peritoneal dialysis (PD) solutions frequently results in peritoneal fibrosis and ultrafiltration failure, which limits the life-long use of and leads to the cessation of PD therapy. Therefore, it is important to elucidate the pathogenesis of peritoneal fibrosis in order to design therapeutic strategies to prevent its occurrence. Peritoneal fibrosis is associated with a chronic inflammatory status as well as an elevated oxidative stress (OS) status. Beyond uremia per se, OS also results from chronic exposure to high glucose load, glucose degradation products, advanced glycation end products, and hypertonic stress...
May 6, 2017: World Journal of Nephrology
https://www.readbyqxmd.com/read/28540060/microparticle-formation-in-peritoneal-dialysis-a-proof-of-concept-study
#19
Shareef Akbari, Rima Abou-Arkoub, Suzy Sun, Swapnil Hiremath, Arkadiy Reunov, Brendan B McCormick, Marcel Ruzicka, Dylan Burger
BACKGROUND: Injury to the mesothelial layer of the peritoneal membrane during peritoneal dialysis (PD) is implicated in loss of ultrafiltration capacity, but there are no validated biomarkers for mesothelial cell injury. Microparticles (MPs) are 0.1 to 1.0 µm membrane vesicles shed from the cell surface following injury and are sensitive markers of tissue damage. Formation of MPs in the peritoneal cavity during PD has not been reported to date. METHODS: We designed a single-center, proof of concept study to assess whether peritoneal solution exposure induces formation of mesothelial MPs suggestive of PD membrane injury...
2017: Canadian Journal of Kidney Health and Disease
https://www.readbyqxmd.com/read/28538146/ligand-mediated-folding-of-the-ompa-periplasmic-domain-from-acinetobacter-baumannii
#20
Ameeq Ul Mushtaq, Jeong Soon Park, Sung-Hun Bae, Hye-Yeon Kim, Kwon Joo Yeo, Eunha Hwang, Ki Yong Lee, Jun-Goo Jee, Hae-Kap Cheong, Young Ho Jeon
The periplasmic domain of OmpA from Acinetobacter baumannii (AbOmpA-PD) binds to diaminopimelate and anchors the outer membrane to the peptidoglycan layer in the cell wall. Although the crystal structure of AbOmpA-PD with its ligands has been reported, the mechanism of ligand-mediated folding of AbOmpA remains elusive. Here, we report that in vitro refolded apo-AbOmpA-PD in the absence of ligand exists as a mixture of two partially folded forms in solution: mostly unfolded (apo-state I) and hololike (apo-state II) states...
May 23, 2017: Biophysical Journal
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