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https://www.readbyqxmd.com/read/27901068/nanomechanical-properties-of-distinct-fibrillar-polymorphs-of-the-protein-%C3%AE-synuclein
#1
Ali Makky, Luc Bousset, Jérôme Polesel-Maris, Ronald Melki
Alpha-synuclein (α-Syn) is a small presynaptic protein of 140 amino acids. Its pathologic intracellular aggregation within the central nervous system yields protein fibrillar inclusions named Lewy bodies that are the hallmarks of Parkinson's disease (PD). In solution, pure α-Syn adopts an intrinsically disordered structure and assembles into fibrils that exhibit considerable morphological heterogeneity depending on their assembly conditions. We recently established tightly controlled experimental conditions allowing the assembly of α-Syn into highly homogeneous and pure polymorphs...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27898187/tissue-engineering-acellular-scaffolds-the-significant-influence-of-physical-and-procedural-decellularization-factors
#2
F Starnecker, F Koenig, C Hagl, N Thierfelder
The importance of decellularized medical products has significantly increased during the last years. In this paper, we evaluated the effects of selected physical and procedural decellularization (DC) factors with the aim to systematically assess their influence on DC results. 72 porcine aortic walls (AW) were divided into three groups and exposed to a DC solution for 4 h and 8 h, either continuously or in repeated cycles. The AW were rocked (90bpm), whirled (10 l/min), sonicated (120W, 45 kHz) or exposed to a combination of these treatments, followed by 10 washing cycles...
November 29, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/27890877/exploring-the-multifunctionality-of-a-novel-long-chain-amidoamine-amphiphile
#3
Makoto Nakagawa, Takeshi Kawai
In this review, we demonstrate that the practical applications of a novel long-chain amidoamine derivative with a simple molecular structure (C18AA) are equivalent to or higher in number than those of supramolecules with complex molecular structures. Molecular assemblies of C18AA exhibit distinctive thermal responsiveness; namely, C18AA can form a gel with apolar organic solvents, while O/W emulsions of C18AA act as a heat-induced gelator that undergoes a phase transition from solution to gel upon heating. We also show that C18AA emulsions containing a quaternary ammonium salt develop an iridescent color over a specific temperature range...
November 25, 2016: Journal of Oleo Science
https://www.readbyqxmd.com/read/27879128/local-controllability-and-optimal-control-for-a-model-of-combined-anticancer-therapy-with-control-delays
#4
Jerzy Klamka, Helmut Maurer, Andrzej Swierniak
We study some control properties of a class of two-compartmental models of response to anticancer treatment which combines anti-angiogenic and cytotoxic drugs and take into account multiple control delays. We formulate sufficient local controllability conditions for semilinear systems resulting from these models. The control delays are related to PK/PD effects and some clinical recommendations, e.g., normalization of the vascular network. The optimized protocols of the combined therapy for the model, considered as solutions to an optimal control problem with delays in control, are found using necessary conditions of optimality and numerical computations...
February 1, 2017: Mathematical Biosciences and Engineering: MBE
https://www.readbyqxmd.com/read/27877905/recent-progress-in-the-structure-control-of-pd-ru-bimetallic-nanomaterials
#5
Dongshuang Wu, Kohei Kusada, Hiroshi Kitagawa
Pd and Ru are two key elements of the platinum-group metals that are invaluable to areas such as catalysis and energy storage/transfer. To maximize the potential of the Pd and Ru elements, significant effort has been devoted to synthesizing Pd-Ru bimetallic materials. However, most of the reports dealing with this subject describe phase-separated structures such as near-surface alloys and physical mixtures of monometallic nanoparticles (NPs). Pd-Ru alloys with homogenous structure and arbitrary metallic ratio are highly desired for basic scientific research and commercial material design...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27877902/grafting-the-surface-of-carbon-nanotubes-and-carbon-black-with-the-chemical-properties-of-hyperbranched-polyamines
#6
Francisco Morales-Lara, María Domingo-García, Rafael López-Garzón, María Luz Godino-Salido, Antonio Peñas-Sanjuán, F Javier López-Garzón, Manuel Pérez-Mendoza, Manuel Melguizo
Controlling the chemistry on the surface of new carbon materials is a key factor to widen the range of their applicability. In this paper we show a grafting methodology of polyalkylamines to the surface of carbon nanomaterials, in particular, carbon nanotubes and a carbon black. The aim of this work is to reach large degrees of covalent functionalization with hyperbranched polyethyleneimines (HBPEIs) and to efficiently preserve the strong chelating properties of the HBPEIs when they are fixed to the surface of these carbon materials...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876419/assessing-the-potential-of-inorganic-anions-cl-no3-so4-2-and-po4-3-to-increase-the-bioaccessibility-of-emitted-palladium-in-the-environment-experimental-studies-with-soils-and-a-pd-model-substance
#7
Fathi Zereini, Clare L S Wiseman, Jana Poprizki, Peter Albers, Wolfgang Schneider, Kerstin Leopold
Palladium (Pd) emitted from vehicles equipped with exhaust catalytic converters has been accumulating at a greater rate relative to other platinum group elements (PGE) in the last 10-20 years. Little is known, however, regarding the various environmental factors and conditions which are likely to modulate the chemical behavior and bioaccessibility of this element post-emission. To meet data needs, soils and a Pd model substance were treated with solutions containing common anions (Cl(-), NO3(-), SO4(2-) und PO4(3-)) to shed light on the geochemical behavior of emitted Pd under ambient conditions...
November 19, 2016: Environmental Pollution
https://www.readbyqxmd.com/read/27852373/-reliability-and-validity-of-parkinson-s-disease-sleep-scale-chinese-version-in-the-south-west-of-china
#8
J H Zhang, R Peng, Y Du, Y Mou, N N Li, L Cheng
Objective: To evaluate the reliability and validity of Parkinson's disease sleep scale-Chinese version (CPDSS) through a study of a large PD population in southwest China, and to explore the prevalence and characteristics of sleep disorders in Parkinson's disease (PD) patients from southwest China. Methods: A total of 544 PD patients and 220 control subjects were enrolled in our study. Demographic data, CPDSS, ESS, PDQ39, HAMD and H-Y stage were assessed in all subjects. Statistical description, Cronbach's alpha coefficient, intra-class correlation coefficient (ICC), Spearman rank correlation coefficient and Mann-Whitney U test were used for statistical analyses...
November 8, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27845400/scalable-synthesis-of-ag-networks-with-optimized-sub-monolayer-au-pd-nanoparticle-covering-for-highly-enhanced-sers-detection-and-catalysis
#9
Tianyu Li, Sascha Vongehr, Shaochun Tang, Yuming Dai, Xiao Huang, Xiangkang Meng
Highly porous tri-metallic AgxAuyPdz networks with a sub-monolayer bimetallic Au-Pd nanoparticle coating were synthesized via a designed galvanic replacement reaction of Ag nanosponges suspended in mixed solutions of HAuCl4 and K2PdCl4. The resulting networks' ligaments have a rough surface with bimetallic nanoparticles and nanopores due to removal of Ag. The surface morphology and composition are adjustable by the temperature and mixed solutions' concentration. Very low combined Au and Pd atomic percentage (1-x) where x is atomic percentage of Ag leads to sub-monolayer nanoparticle coverings allowing a large number of active boundaries, nanopores, and metal-metal interfaces to be accessible...
November 15, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27832909/effective-adsorption-electrocatalytic-degradation-of-perchlorate-using-pd-pt-supported-on-n-doped-activated-carbon-fiber-cathode
#10
Fubing Yao, Yu Zhong, Qi Yang, Dongbo Wang, Fei Chen, Jianwei Zhao, Ting Xie, Chen Jiang, Hongxue An, Guangming Zeng, Xiaoming Li
In this work, Pd/Pt supported on N-doped activated carbon fiber (Pd/Pt-NACF) was employed as the electrode for electrocatalytic degradation of perchlorate through adsorption/electroreduction process. Perchlorate in solution was firstly adsorbed on Pd/Pt-NACF and then reduced to non-toxic chloride by the catalytic function of Pd/Pt at a constant current (20mA). Compared with Pd/Pt-ACF, the adsorption capacity and electrocatalytic degradation efficiency of Pd/Pt-NACF for perchlorate increased 161% and 28%, respectively...
February 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27832164/establishing-rnai-in-a-non-model-organism-the-antarctic-nematode-panagrolaimus-sp-daw1
#11
Anna C Seybold, David A Wharton, Michael A S Thorne, Craig J Marshall
The Antarctic nematode Panagrolaimus sp. DAW1 is one of the only organisms known to survive extensive intracellular freezing throughout its tissues. Although the physiological mechanisms of this extreme adaptation are partly understood, the molecular mechanisms remain largely unknown. RNAi is a method that allows the examination of gene function in a direct, targeted manner, by knocking out specific mRNAs and revealing the effects on the phenotype. In this study we have explored the viability of RNAi in Panagrolaimus sp...
2016: PloS One
https://www.readbyqxmd.com/read/27795628/swan-neck-versus-straight-peritoneal-dialysis-catheter-long-term-effect-on-patient-and-method-survival
#12
V Filiopoulos, D Biblaki, L Takouli, A Dounavis, D Hadjiyannakos, D Vlassopoulos
Peritoneal dialysis (PD) is limited mainly by a higher technique failure rate as compared to hemodialysis (HD), catheter malfunction being an important reason. Intra- and extra-peritoneal catheter configuration may be associated with mechanical and infectious complications affecting method survival. We report our experience with two extra-peritoneal catheter configurations: the straight and the swan-neck (SN) catheters. A total of 85 consecutive patients, 58 males and 27 females were included in the study. Among them, 26 were diabetics; 52 were treated with automated PD (APD) and 33 with continuous ambulatory PD (CAPD)...
September 2016: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/27782116/screening-for-muscle-loss-in-patients-established-on-peritoneal-dialysis-using-bioimpedance
#13
G H B Greenhall, A Davenport
: Background/objectivesKidney dialysis patients with sarcopenia have increased mortality. Screening for low muscle mass may allow interventions at an earlier stage to help improve outcomes. We wished to determine the prevalence of low muscle mass in a cohort of peritoneal dialysis (PD) patients.Subjects/methodsWe measured lean body mass index (LBMI) in 490 PD patients by bioimpedance, grading patients using two different classifications of sarcopenia. RESULTS: LBMI was 9...
October 26, 2016: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27781261/psychometric-properties-of-the-mutuality-scale-in-swedish-dyads-with-parkinson-s-disease
#14
M Karlstedt, S M Fereshtehnejad, E Winnberg, D Aarsland, J Lökk
OBJECTIVES: The 15-item mutuality scale (MS) has been used in several neurological conditions assessing the quality of relationship associations with negative effects of the caregiving situation. The aim of this study was to translate the original MS into Swedish and assess its psychometric properties in Parkinson's disease (PD). MATERIALS AND METHODS: Following the forward-backward translation method, the scale was evaluated regarding linguistic correctness at a conceptual level and user-friendliness...
October 26, 2016: Acta Neurologica Scandinavica
https://www.readbyqxmd.com/read/27779080/efficacy-of-ropinirole-loaded-plga-microspheres-for-the-reversion-of-rotenone-induced-parkinsonism
#15
Sofía Negro, Liudmilla Boeva, Karla Slowing, Ana Fernández-Carballido, Luis García-García, Emilia Barcia
A new controlled delivery system is developed for ropinirole (RP) for the treatment of Parkinson´s disease (PD) consisting in PLGA microparticles (MPs) which exhibited in vitro constant release of RP (78.23 µg/day/10 mg MPs) for 19 days. The neuroprotective effects of RP released from MPs are evaluated in SKN-AS cells after exposure to rotenone (20 μM). Cell apoptosis was significantly reduced by RP (100-120 μM). Daily doses of rotenone (2 mg/kg) given i.p. to rats induced neuronal and behavioral changes similar to those of PD...
September 28, 2016: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/27768727/addition-of-alanyl-glutamine-to-dialysis-fluid-restores-peritoneal-cellular-stress-responses-a-first-in-man-trial
#16
Klaus Kratochwill, Michael Boehm, Rebecca Herzog, Katharina Gruber, Anton Michael Lichtenauer, Lilian Kuster, Dagmar Csaicsich, Andreas Gleiss, Seth L Alper, Christoph Aufricht, Andreas Vychytil
BACKGROUND: Peritonitis and ultrafiltration failure remain serious complications of chronic peritoneal dialysis (PD). Dysfunctional cellular stress responses aggravate peritoneal injury associated with PD fluid exposure, potentially due to peritoneal glutamine depletion. In this randomized cross-over phase I/II trial we investigated cytoprotective effects of alanyl-glutamine (AlaGln) addition to glucose-based PDF. METHODS: In a prospective randomized cross-over design, 20 stable PD outpatients underwent paired peritoneal equilibration tests 4 weeks apart, using conventional acidic, single chamber 3...
2016: PloS One
https://www.readbyqxmd.com/read/27759470/the-influence-of-low-calcium-dialysate-on-left-ventricular-diastolic-function-in-peritoneal-dialysis-patients
#17
Zebin Wang, Yueqiang Wen, Jianbo Liang, Xinling Liang, Wei Shi
Left ventricular (LV) diastolic function was found to be a significant predictor of cardiovascular events and general mortality in dialysis. Studies have indicated that dialysate calcium concentrations were significantly associated with cardiac function. However, the relationship between low calcium dialysate and LV diastolic function has not been clear. The aim of this study was to investigate the influence of low calcium dialysate on cardiac function in peritoneal dialysis (PD) patients. A total of 60 PD patients were enrolled in this study, with a calcium content of the PD solution of 1...
October 19, 2016: Renal Failure
https://www.readbyqxmd.com/read/27757037/pain-management-in-patients-with-parkinson-s-disease-challenges-and-solutions
#18
Orjan Skogar, Johan Lokk
This review focuses on the diagnosis and management of Parkinson-related pain which is one of the more frequently reported nonmotor symptoms in Parkinson's disease (PD), which is the second most common neurodegenerative disease after Alzheimer's disease. Pain is ranked high by patients as a troublesome symptom in all stages of the disease. In early-stage PD, pain is rated as the most bothersome symptom. Knowledge of the correct diagnosis of pain origin and possible methods of treatments for pain relief in PD is of great importance...
2016: Journal of Multidisciplinary Healthcare
https://www.readbyqxmd.com/read/27738089/short-dwell-cycling-intraperitoneal-cefazolin-plus-ceftazidime-in-peritoneal-dialysis-patients
#19
Sadudee Peerapornratana, Pajaree Chariyavilaskul, Talerngsak Kanjanabuch, Kearkiat Praditpornsilpa, Somchai Eiam-Ong, Pisut Katavetin
♦ Background: Current guidelines suggest that intraperitoneal (IP) antibiotics should be administered only in a long peritoneal dialysis (PD) dwell (≥ 6 hours). The long dwell might result in low ultrafiltration and volume overload. We aim to examine plasma and dialysate concentration of cefazolin and ceftazidime after IP administration in a short-dwell (≤ 2 hours) automated cyclingexchange. ♦ Methods: Stable PD patients without peritonitis were invited to participate in the present study. Patients underwent 5 2-liter exchanges of PD fluid over 10 hours by the PD cycling machine without last fill or additional dwell...
October 13, 2016: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/27734043/a-nonlinear-optical-active-polymer-film-based-on-pd-ii-dithione-dithiolate-second-order-nlo-chromophores
#20
D Espa, L Pilia, L Marchiò, F Artizzu, G Di Carlo, D Marinotto, A Serpe, F Tessore, P Deplano
A film of [Pd(R2pipdt)(dmit)] (1), where R2pipdt = 1,4-didodecyl-piperazine-2,3-dithione (acceptor) and dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate (donor) incorporated into a polymethylmethacrylate (PMMA) matrix, showing a good second-harmonic generation, has been prepared for the first time in the class of dithione-dithiolate 2nd order NLO-chromophores. Moreover full characterization of 1, including molecular second-order NLO properties in solution, is reported.
October 13, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
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