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https://www.readbyqxmd.com/read/29651198/silver-nitrate-grade-and-its-effect-on-physical-developer-performance-a-validation-study
#1
Allison Coppes, Robert S Ramotowski, Brian A Jones, Michael E Manna, Esther V Chervinsky, Kim D Smith
Silver nitrate is a critical component of the physical developer (PD) reagent. Significant increases in the cost of silver nitrate in recent years have caused the United States Secret Service's Forensic Laboratory to look for a more economical way to produce physical developer. One possible solution to this dilemma is to use a lower grade of silver nitrate, which typically has a lower cost. This study compared the quality of fingerprints produced on various paper substrates by three physical developer working solutions, each prepared using either the American Chemical Society (ACS), U...
January 2018: Journal of forensic identification
https://www.readbyqxmd.com/read/29645054/synthesis-and-non-conventional-structure-of-square-planar-pd-ii-and-pt-ii-complexes-with-an-n-c-n-chelated-stibinidene-ligand
#2
Monika Kořenková, Martin Hejda, Petr Štěpnička, Filip Uhlík, Roman Jambor, Aleš RůŽička, Libor Dostál
The N,C,N-chelated stibinidene, ArSb (Ar = C6H3-2,6-(CH[double bond, length as m-dash]NtBu)2), reacts with Pt(ii) compounds [PtCl2L2] resulting in the formation of 1 : 1 complexes, cis-[PtCl2L(ArSb)] (L = Me2S (1), dmso (2)). In contrast, attempts to synthesize similar Pd(ii) complexes failed, resulting only in the formation of elemental palladium. To increase the stability of the ArSb complexes, in particular those containing Pd(ii), the simple auxiliary ligands were replaced with C,N-chelating ones, which led to a set of four compounds of the type [RMCl(ArSb)], where R = C6H4-2-(CH2NMe2) or Fe(η5-C5H4)(η5-C5H3-2-(CH2NMe2)) and M = Pd (3, 5) or Pt (4, 6)...
April 12, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29629461/what-dictates-which-ion-i-or-br-mediates-the-growth-of-cubic-pd-nanocrystals
#3
Ze-Hong Wang, Ya-Jiao Wu, Huan-Huan Xue, Lin-Nan Zhou, Wen-Chao Geng, Hai-Bo Yi, Yong-Jun Li
Cubic Pd nanocrystals (CPNCs) as one of typical nanostructures are generally fabricated using I- or Br- as capping ions. However, which ion, I- or Br-, exclusively mediates the growth of CPNCs in a given reaction system is not well understood. Herein, regardless of I- or Br- as the capping ion, we successfully achieved CPNCs in the same reaction system simply by adjusting the pH. Based on the Finke-Watzky kinetic model, an increase in pH accelerates the overall reduction rate of Pd2+, and the formation of CPNCs only occurs over the range of specific solution reduction rate constants (k1)...
April 9, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29623127/heterogeneous-pd-catalysts-as-emulsifiers-in-pickering-emulsions-for-integrated-multistep-synthesis-in-flow-chemistry
#4
Katharina Hiebler, Georg J Lichtenegger, Manuel C Maier, Eun Sung Park, Renie Gonzales-Groom, Bernard P Binks, Heidrun Gruber-Woelfler
Within the "compartmentalised smart factory" approach of the ONE-FLOW project the implementation of different catalysts in "compartments" provided by Pickering emulsions and their application in continuous flow is targeted. We present here the development of heterogeneous Pd catalysts that are ready to be used in combination with biocatalysts for catalytic cascade synthesis of active pharmaceutical ingredients (APIs). In particular, we focus on the application of the catalytic systems for Suzuki-Miyaura cross-coupling reactions, which is the key step in the synthesis of the targeted APIs valsartan and sacubitril...
2018: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29623115/an-alternative-to-hydrogenation-processes-electrocatalytic-hydrogenation-of-benzophenone
#5
Cristina Mozo Mulero, Alfonso Sáez, Jesús Iniesta, Vicente Montiel
The electrocatalytic hydrogenation of benzophenone was performed at room temperature and atmospheric pressure using a polymer electrolyte membrane electrochemical reactor (PEMER). Palladium (Pd) nanoparticles were synthesised and supported on a carbonaceous matrix (Pd/C) with a 28 wt % of Pd with respect to carbon material. Pd/C was characterised by transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). Cathodes were prepared using Pd electrocatalytic loadings (LPd ) of 0.2 and 0.02 mg cm-2 ...
2018: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29622197/pre-concentration-of-zn-ii-ions-from-aqueous-solutions-using-meso-porous-pyridine-enrobed-magnetite-nanostructures
#6
H Vojoudi, A Badiei, A Amiri, A Banaei, G M Ziarani, K Schenk-Joß
A simple, cheap and efficient method for pre-concentrating and separating Zn(II) ions from aqueous solutions and real samples has been designed. The method was implemented in a prototype featuring interchangeable chromatography-column-like cartridges, filled with meso-porous silica nanostructures, allowing easy exchange of the type and quantity of the sorbent. The adsorbents inside the column are held in place by means of porous polymer nano-fibre membranes. The effects of various parameters on the adsorption of Zn(II) ions from aqueous solutions were investigated...
August 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29620873/batch-fabrication-of-ultrasensitive-carbon-nanotube-hydrogen-sensors-with-sub-ppm-detection-limit
#7
Mengmeng Xiao, Shibo Liang, Jie Han, Donglai Zhong, Jingxia Liu, Zhiyong Zhang, Lian-Mao Peng
Carbon nanotube (CNT) has been considered as an ideal channel material for building highly sensitive gas sensors. However, the reported H2 sensors based on CNT always suffered from the low sensitivity or low production. We developed the technology to massively fabricate ultra-highly sensitive H2 sensors based on solution derived CNT network through comprehensively optimizing the CNT material, device structure and fabrication process. In the H2 sensors, high semiconducting purity solution-derived CNT film sorted by PFO polymer is used as main channel, which is decorated with Pd nanoparticles as functionalization for capturing H2...
April 5, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29620859/the-insight-investigation-of-active-palladium-surface-sites-in-palladium-ceria-catalysts-for-no-co-reaction
#8
Ke Tang, Yuqing Ren, Wei Liu, Jingjing Wei, Jinxin Guo, Shuping Wang, Yanzhao Yang
The palladium species in ceria-based catalysts have a significant influence on their catalytic performance. In this work, the structure evolution of palladium species induced by various calcination rate were investigated and then these calcined catalysts were applied to NO + CO catalytic reaction. Systematic investigations by various measurements demonstrate that the calcination rate and catalytic process play crucial roles on the formation ways of palladium species and identify the forms of active palladium surface sites for NO + CO reaction...
April 5, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29605668/a-low-cost-solution-for-quantification-of-movement-during-dbs-surgery
#9
Erin L Schaeffer, Daniel Y Liu, Julie Guerin, Minkyu Ahn, Shane Lee, Wael F Asaad
BACKGROUND: During the deep brain stimulation (DBS) electrode implantation operation with microelectrode recordings (MER) in awake patients, somatotopic testing and test stimulation are performed to improve electrode placement and provide the most beneficial symptom reduction possible, while minimizing side effects. As this procedure is commonly used to alleviate abnormal movements associated with Parkinson's disease (PD) and Essential Tremor (ET), intraoperative assessment of a patient's movements is critical to optimizing surgical benefit...
March 29, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29603451/exploring-the-role-of-post-translational-modifications-in-regulating-%C3%AE-synuclein-interactions-by-studying-the-effects-of-phosphorylation-on-nanobody-binding
#10
Farah El Turk, Erwin De Genst, Tim Guilliams, Bruno Fauvet, Mirva Hejjaoui, Justin Di Trani, Anass Chiki, Anthony Mittermaier, Michele Vendruscolo, Hilal A Lashuel, Christopher M Dobson
Intracellular deposits of α-synuclein in the form of Lewy bodies are major hallmarks of Parkinson's disease (PD) and a range of related neurodegenerative disorders. Post-translational modifications (PTMs) of α-synuclein are increasingly thought to be major modulators of its structure, function, degradation and toxicity. Among these PTMs, phosphorylation near the C-terminus at S129 has emerged as a dominant pathogenic modification as it is consistently observed to occur within the brain and cerebrospinal fluid (CSF) of post-mortem PD patients, and its level appears to correlate with disease progression...
March 30, 2018: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/29589633/synthesis-and-coordination-chemistry-of-enantiopure-t-bumep-o-h
#11
Albert Gallen, Sílvia Orgué, Guillermo Muller, Eduardo C Escudero-Adán, Antoni Riera, Xavier Verdaguer, Arnald Grabulosa
Both enantiomers of the optically pure Secondary Phosphine Oxide (SPO) t-BuMeP(O)H (1) have been obtained by deboronation of phosphinous acid-borane t-BuMeP(O)H·BH3 (3) with HBF4 followed by hydrolysis of the intermediate adduct t-BuMeP(O)H·BF3 (1·BF3), which has been isolated and crystallographically characterised. Complexes [MCl(COD)(κP-(R)-1)] (M = Ir, Rh; 4 and 7 respectively) have been detected in solution but could not be isolated while trans-[RhCl(CO)(κP-(S)-1)2] (9) has been successfully obtained in good yield...
March 28, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29581852/rhoa-rho-kinase-triggers-epithelial-mesenchymal-transition-in-mesothelial-cells-and-contributes-to-the-pathogenesis-of-dialysis-related-peritoneal-fibrosis
#12
Qinglian Wang, Xiaowei Yang, Ying Xu, Zhenwei Shen, Hongxia Cheng, Fajuan Cheng, Xiang Liu, Rong Wang
Peritoneal fibrosis (PF) with associated peritoneal dysfunction is almost invariably observed in long-term peritoneal dialysis (PD) patients. Advanced glycation end products (AGEs) are pro-oxidant compounds produced in excess during the metabolism of glucose and are present in high levels in standard PD solutions. The GTPase RhoA has been implicated in PF, but its specific role remains poorly understood. Here, we studied the effects of RhoA/Rho-kinase signaling in AGEs-induced epithelial-mesenchymal transition (EMT) in human peritoneal mesothelial cells (HPMCs), and evaluated morphological and molecular changes in a rat model of PD-related PF...
March 6, 2018: Oncotarget
https://www.readbyqxmd.com/read/29581092/detecting-motor-impairment-in-early-parkinson-s-disease-via-natural-typing-interaction-with-keyboards-validation-of-the-neuroqwerty-approach-in-an-uncontrolled-at-home-setting
#13
Teresa Arroyo-Gallego, María J Ledesma-Carbayo, Ian Butterworth, Michele Matarazzo, Paloma Montero-Escribano, Verónica Puertas-Martín, Martha L Gray, Luca Giancardo, Álvaro Sánchez-Ferro
BACKGROUND: Parkinson's disease (PD) is the second most prevalent neurodegenerative disease and one of the most common forms of movement disorder. Although there is no known cure for PD, existing therapies can provide effective symptomatic relief. However, optimal titration is crucial to avoid adverse effects. Today, decision making for PD management is challenging because it relies on subjective clinical evaluations that require a visit to the clinic. This challenge has motivated recent research initiatives to develop tools that can be used by nonspecialists to assess psychomotor impairment...
March 26, 2018: Journal of Medical Internet Research
https://www.readbyqxmd.com/read/29579388/ordered-surface-structuring-of-spherical-colloids-with-binary-nanoparticle-superlattices
#14
Fabian Meder, Steffi S Thomas, Tobias Bollhorst, Kenneth A Dawson
Surface-patterning colloidal matter in the sub-10 nm regime generates exceptional functionality in biology and photonic and electronic materials. Techniques of artificially generating functional patterns in the small nanoscale advanced in a fascinating manner in the last several years. However, they remain often restricted to planar and noncolloidal substrates. Patterning colloidal matter in solution via bottom-up assembly of smaller subunits on larger core particles is highly challenging because it is necessary to force the subunits onto randomly moving objects...
March 29, 2018: Nano Letters
https://www.readbyqxmd.com/read/29575824/complex-bayesian-modeling-workflows-encoding-and-execution-made-easy-with-a-novel-winbugs-plugin-of-the-drug-disease-model-resources-interoperability-framework
#15
Cristiana Larizza, Elisa Borella, Lorenzo Pasotti, Palma Tartaglione, Mike Smith, Stuart Moodie, Paolo Magni
The Drug Disease Model Resources (DDMoRe) Interoperability Framework (IOF) enables pharmacometric model encoding and execution via Model Description Language (MDL) and R language, through the ddmore package. Through its components and converter plugins, the IOF can execute pharmacometric tasks using different target tools, starting from a single MDL-encoded model. In this article, we present the WinBUGS plugin and show how its integration in the IOF enables an easy implementation of complex Bayesian workflows...
March 25, 2018: CPT: Pharmacometrics & Systems Pharmacology
https://www.readbyqxmd.com/read/29574385/effect-of-reducing-agent-on-catalytic-hydrodechlorination-of-aqueous-phase-ocdd-f
#16
Moo Been Chang, Ching Wen Fu, Ching Lan Tsai
Removal/destruction of aqueous-phase octachlorodibenzo-p-dioxin (OCDD) and octachlorodibenzofuran (OCDF) via hydrodechlorination process (HDC) is experimentally evaluated over palladium/activated carbon (Pd/AC) catalyst. Pd catalyst is mainly used as active component for effectiveness in removing dioxin from wastewater. Studies on the removal of PCDD/Fs accomplished with HDC reaction in aqueous phase are limited and the influencing factors have not been clarified. In this study, high-concentration OCDD/F are selected as targets, and the effects of solvent and operating temperature on dechlorination efficiency are investigated via experimental tests...
March 19, 2018: Chemosphere
https://www.readbyqxmd.com/read/29563277/protein-carbamylation-in-peritoneal-dialysis-and-the-effect-of-low-glucose-plus-amino-acid-solutions
#17
Caitlin Trottier, Jeffrey Perl, Megan Freeman, Ravi Thadhani, Anders Berg, Sahir Kalim
Protein carbamylation is a post-translational urea-driven protein modification associated with mortality. Free amino acids (AAs) competitively inhibit protein carbamylation and parenteral AA therapy reduces carbamylation in hemodialysis (HD) patients. Peritoneal dialysis (PD) yields differences in urea clearance and AA balance compared with HD, but the influence of PD and intraperitoneal AA solutions on carbamylation is unclear. Thus, we first measured carbamylated albumin (C-Alb; a marker of carbamylation load) in 100 diabetic HD patients frequency-matched by age, sex, and race to 98 diabetic PD subjects from the IMPENDIA trial, which originally compared the metabolic effects of low-glucose PD solutions (incorporating icodextrin and AAs) to a control group (dextrose-only solutions)...
March 2018: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/29563075/participatory-design-of-an-online-self-management-tool-for-users-with-spinal-cord-injury-qualitative-study
#18
Sonya Allin, John Shepherd, Jennifer Tomasone, Sarah Munce, Gary Linassi, Saima Noreen Hossain, Susan Jaglal
BACKGROUND: Rehospitalization rates resulting from secondary conditions in persons with spinal cord injuries (SCI) are high. Self-management programs for many chronic conditions have been associated with decreases in hospital readmissions. However, in the SCI community, evidence suggests that satisfaction with traditional self-management programs is low. Users with SCI have indicated preference for programs that are online (rather than in-person), that target SCI-specific concerns, and are led by peers with SCI...
March 21, 2018: JMIR Rehabilitation and Assistive Technologies
https://www.readbyqxmd.com/read/29550425/microstructure-and-catalytic-performances-of-chitosan-intercalated-montmorillonite-supported-palladium-0-and-copper-ii-catalysts-for-sonogashira-reactions
#19
Qi Liu, Mengdie Xu, Jing Zhao, Zhen Yang, Chenze Qi, Minfeng Zeng, Rui Xia, Xingzhong Cao, Baoyi Wang
In this study, an efficient heterogeneous catalytic material including Pd0 nanoparticles and Cu2+ cations supported on montmorillonite/chitosan (MMT/CS) composite was prepared by solution intercalation and complexion methods. The valence states of Pd (both Pd(0) and Pd(II) coexisting) and Cu (mainly Cu(II)) of the Pd0 /Cu2+ @MMT/CS catalyst were confirmed by the X-ray photoelectron spectroscopy (XPS) characterization. The d001 spacing was enlarged from 1.25 nm (MMT) to 1.94 nm (Pd0 /Cu2+ @MMT/CS). Pd0 /Cu2+ @MMT/CS catalyst had obviously bigger specific surface area (SBET ) and total pore volume (Vp ) than pure MMT...
March 14, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29534887/antibacterial-and-remineralizing-orthodontic-adhesive-containing-quaternary-ammonium-resin-monomer-and-amorphous-calcium-phosphate-nanoparticles
#20
Yan Liu, Ling Zhang, Li-Na Niu, Tao Yu, Hockin H K Xu, Michael D Weir, Thomas W Oates, Franklin R Tay, Ji-Hua Chen
OBJECTIVES: To evaluate the bonding performance, antibacterial activity, and remineralization effect on enamel of the orthodontic adhesive containing MAE-DB and NACP. METHODS: Eighty non-carious human premolars were divided into 3 groups: Transbond XT (TB), PEHB + 5% MAE-DB (PD), and PEHB + 40% NACP + 5% MAE-DB (PND). Premolars were bonded with orthodontic brackets, the first subgroup (n = 10) and the second subgroup (n = 10) were subjected to shear bond strength testing after immersed in water for 1 day and in demineralization solution for 28 days respectively and then tested surface roughness, while the third subgroup (n = 6) was used for microhardness evaluation after aged in demineralization solution for 28 days...
March 10, 2018: Journal of Dentistry
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