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https://www.readbyqxmd.com/read/28823104/novel-polymeric-composites-based-on-carboxymethyl-chitosan-and-poly-acrylic-acid-in-vitro-and-in-vivo-evaluation
#1
Qurat-Ul-Ain Sharif, Muhammad Sohail, Mahmood Ahmad, Muhammad Usman Minhas, Shahzeb Khan, Samiullah Khan, Mubeen Kousar
The purpose of the study was to develop a novel, efficient, stable, chemically crosslinked polymeric system that have pH responsive behaviour and can effectively release 5-FU in a controlled manner. Furthermore it can target colonic cancer minimizing the side effects of in vivo chemotherapy via 5-FU. Swelling and drug release studies were performed to evaluate its in vitro release behaviour. Hydrogels were also characterized by FTIR, SEM and DSC. In vitro cytocompatibility and cytotoxicity of the hydrogels were determined by MTT assay using HeLa cells...
August 19, 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28821131/carboxymethyl-cellulose-production-from-sugarcane-bagasse-with-steam-explosion-pulping-experimental-modeling-and-optimization
#2
Loghman Golbaghi, Mehrdad Khamforoush, Tahmasb Hatami
The sugarcane bagasse was used for producing carboxymethyl cellulose (CMC) and obtaining high-molecular-mass hemicellulose as co-product. To this end, the steam explosion process was employed. It was found that the optimum operating conditions are the temperature of 187.15°C, NaOH/bagasse ratio of 39% (w/w), and retention time (RT) of 10min. Next, the obtained cellulose in the optimized condition was extracted and purified, and it was subsequently converted to CMC according to Williamson etherification technique...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821096/characterization-of-carboxymethyl-cellulose-based-nanocomposite-films-reinforced-with-oxidized-nanocellulose-isolated-using-ammonium-persulfate-method
#3
Ahmed A Oun, Jong-Whan Rhim
Cellulose nanocrystals (CNCs) were isolated from cotton linter (CL) and microcrystalline cellulose (MCC) using an ammonium persulfate (APS) method for a simultaneous isolation and oxidation of CNCs. The CNCs were in rod-like shape with a diameter of 10.3nm and 11.4nm, a length of 120-150nm and 103-337nm, a crystallinity index of 93.5% and 79.1% for the CNC(CL) and CNC(MCC), respectively. The suspensions of oxidized CNCs were transparent and stable with the zeta potential values of -50.6mV and -46.9mV. The CNCs were uniformly distributed within the carboxymethyl cellulose (CMC) polymer matrix...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820399/repetitive-muscle-compression-reduces-vascular-mechano-sensitivity-and-the-hyperemic-response-to-muscle-contraction
#4
A Messere, M Turturici, G Millo, S Roatta
Animal studies have shown that the rapid hyperemic response to external muscle compression undergoes inactivation upon repetitive stimulation, but this phenomenon has never been observed in humans. The aim of the present study was to determine whether 1) the vascular mechano-sensitivity underlying muscle compression-induced hyperemia is inactivated in an inter-stimulus interval (ISI)-dependent fashion upon repetitive stimulation, as suggested by animal studies, and 2) whether such inactivation also attenuates contraction-induced hyperemia...
June 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28819593/an-isolated-pure-dislocation-of-fifth-carpometacarpal-joint-case-report-and-review-of-literature
#5
Rashid Anjum, Amit Roy, Kamran Farooque, Vijay Sharma
INTRODUCTION: Isolated pure dislocation of the fifth carpometacarpal (CMC) joint is a very rare injury and classified depending on displacement of the metacarpal base. This rare injury is often difficult to recognize and is liable to be overlooked. The purpose of this case report is to present a patient with an isolated dislocation of the fifth CMC joint that was satisfactorily treated with closed reduction and ulnar gutter pop slab. CASE REPORT: A 21-year-old male presented with severe pain on the right carpus following a fall with injury to right hand...
March 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28815244/-cytotoxicity-of-carboxymethyl-chitosan-zinc-and-peptide-to-human-periodontal-ligament-cells
#6
Hui Guo, Ke-Qing Pan, Jing Deng, Xue-Yu Liu, Jia Song
PURPOSE: The purpose of this investigation was to study the cytotoxicity of carboxymethyl chitosan zinc and peptide to human periodontal ligament cells in vitro, in order to provide a reference for understanding materials' safety. METHODS: The primary cells were obtained from human periodontal tissues and cultured. The cultured cells were identified by observing the shape under microscope and by immunocytochemical method. HPDLCs were cultured in different concentrations of the tested materials extract and the activity of cells was evaluated using CCK-8 assay...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28815025/oesophageal-candidiasis-and-squamous-cell-cancer-in-patients-with-gain-of-function-stat1-gene-mutation
#7
Sara Koo, Deepak Kejariwal, Tariq Al-Shehri, Anjan Dhar, Desa Lilic
BACKGROUND: Oesophageal candidiasis is a common, usually self-limiting opportunistic infection, but long-term infection with Candida is known to predispose to oral and oesophageal squamous cell cancer (SCC). Permissive factors that lead to immune deficiencies can underlie persistent or recurring candidiasis, called chronic mucocutaneous candidiasis (CMC). Secondary immune deficiencies are most often due to human immunodeficiency virus (HIV) infection, antibiotic use and immunosuppressive treatment (steroids, chemotherapy)...
August 2017: United European Gastroenterology Journal
https://www.readbyqxmd.com/read/28811206/production-and-physicochemical-properties-of-carboxymethyl-cellulose-films-enriched-with-spent-coffee-grounds-polysaccharides
#8
Lina F Ballesteros, Miguel A Cerqueira, José A Teixeira, Solange I Mussatto
Extracts rich in polysaccharides were obtained by alkali pretreatment (PA) or autohydrolysis (PB) of spent coffee grounds, and incorporated into a carboxymethyl cellulose (CMC)-based film aiming at the development of bio-based films with new functionalities. Different concentrations of PA or PB (up to 0.20% w/v) were added to the CMC-based film and the physicochemical properties of the final films were determined. Scanning electronic microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, as well as determinations of optical and mechanical properties, moisture content, solubility, water vapor permeability, contact angle and sorption isotherms were performed...
August 12, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28807873/neurophysiologically-informed-markers-of-individual-variability-and-pharmacological-manipulation-of-human-cortical-gamma
#9
A D Shaw, R J Moran, S D Muthukumaraswamy, J Brealy, D E Linden, K J Friston, K D Singh
The ability to quantify synaptic function at the level of cortical microcircuits from non-invasive data would be enormously useful in the study of neuronal processing in humans and the pathophysiology that attends many neuropsychiatric disorders. Here, we provide proof of principle that one can estimate inter-and intra-laminar interactions among specific neuronal populations using induced gamma responses in the visual cortex of human subjects - using dynamic causal modelling based upon the canonical microcircuit (CMC; a simplistic model of a cortical column)...
August 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28806519/pluronic-p85-f68-micelles-of-baicalein-could-interfere-with-mitochondria-to-overcome-mrp2-mediated-efflux-and-offer-improved-anti-parkinsonian-activity
#10
Tongkai Chen, Ye Li, Chuwen Li, Xiang Yi, Ruibing Wang, Simon Ming Yuen Lee, Ying Zheng
Overexpression of the drug efflux transporter multidrug resistance-associated protein 2 (MRP2) in the gastrointestinal tract and blood-brain barrier compromises the oral delivery of drugs to the circulation system and brain in the treatment of Parkinson's disease (PD). In this study, we aim to develop small-sized Pluronic P85/F68 micelles loaded with baicalein (B-MCs) to overcome MRP2-mediated efflux and to investigate related mechanism, as well as the anti-Parkinsonian efficacy. Spherical and sustained-release B-MCs have a mean particle size of 40...
August 14, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28805161/eco-friendly-and-biocompatible-crosslinked-carboxymethylcellulose-hydrogels-as-adsorbents-for-the-removal-of-organic-dye-pollutants-for-environmental-applications
#11
Nádia S V Capanema, Alexandra A P Mansur, Herman S Mansur, Anderson C de Jesus, Sandhra M Carvalho, Poliane Chagas, Luiz C de Oliveira
In this study new eco-friendly hydrogel adsorbents were synthesized based on carboxymethylcellulose (CMC, degree of substitution DS = 0.7) chemically crosslinked with citric acid (CA) using a green process in aqueous solution and applied for the adsorption of methylene blue (MB). Spectroscopic analyses demonstrated the mechanism of crosslinking through the reaction of hydroxyl functional groups from CMC with CA. These CMC hydrogels showed very distinct morphological features dependent on the extension of crosslinking and their nanomechanical properties were drastically increased by approximately 300% after crosslinking with 20% CA (e...
August 13, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28796777/surface-active-properties-of-lipid-nanocapsules
#12
Celia R A Mouzouvi, Anita Umerska, André K Bigot, Patrick Saulnier
Lipid nanocapsules (LNCs) are biomimetic nanocarriers used for the encapsulation of a broad variety of active ingredients. Similar to surface active compounds, LNCs contain both hydrophilic and hydrophobic parts in their structure. Moreover, the components of LNCs, macrogol 15 hydroxystearate (MHS) and lecithin, are known for their surface active properties. Therefore, the aim of this paper was to investigate the capability of the LNCs to decrease surface tension using two techniques: drop tensiometry and the Wilhelmy plate method...
2017: PloS One
https://www.readbyqxmd.com/read/28795351/advancements-in-understanding-immunogenicity-of-biotherapeutics-in-the-intraocular-space
#13
Eric Wakshull, Valerie Quarmby, Hanns-Christian Mahler, Hongwen Rivers, Dhananjay Jere, Meg Ramos, Piotr Szczesny, Karoline Bechtold-Peters, Sharmila Masli, Swati Gupta
Therapeutic breakthroughs in a number of retinal degenerative diseases have come about through the development of biotherapeutics administered directly into the eye. As a consequence of their use, we have gained more insight into the immune privileged status of the eye and the various considerations that development, manufacturing, and use of these drugs require. It has been observed that therapeutic proteins injected into the vitreous can elicit an immune response resulting in the production of anti-drug antibodies (ADAs) which can have clinical consequences...
August 9, 2017: AAPS Journal
https://www.readbyqxmd.com/read/28792766/self-assembly-of-calix-4-arene-based-amphiphiles-bearing-polyethylene-glycols-another-example-of-platonic-micelles
#14
Kenta Yoshida, Shota Fujii, Rintaro Takahashi, Sakiko Matsumoto, Kazuo Sakurai
The aggregation number of classical micelles exhibits a certain distribution, which is a recognizable feature of conventional micelles. However, we recently identified perfectly monodisperse calix[4]arene-based micelles whose aggregation numbers agree with the vertex numbers of regular polyhedra, that is, Platonic solids, and thus they are named "Platonic micelles." Regarding our hypothesis of the formation mechanism of Platonic micelles, both repulsive interactions including steric hindrance and electrostatic repulsions among the headgroups are important for determining their aggregation number; however, neither of these is necessarily needed to consider...
August 9, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28791992/-morphological-features-of-the-myocardium-of-the-atrial-appendages-in-patients-with-different-forms-of-atrial-fibrillation
#15
T V Sukhacheva, V A Vaskovsky, A Sh Revishvili, R A Serov
AIM: to analyze the morphological features of the myocardium of the atrial appendages in patients with different forms of atrial fibrillation (AF) and to compare the findings with the clinical parameters of patients. MATERIAL AND METHODS: Light and electron microscopies were used to examine the myocardium of the atrial appendages in adult patients with paroxysmal (PAF), persistent (PrAF), or long-standing persistent atrial fibrillation (LPAF) and in comparison group patients with sinus rhythm without history of AF...
2017: Arkhiv Patologii
https://www.readbyqxmd.com/read/28783007/influence-of-the-chain-length-of-surfactant-in-the-modification-of-zeolites-and-clays-removal-of-atrazine-from-water-solutions
#16
Helen Paola Toledo-Jaldin, Alien Blanco-Flores, Víctor Sánchez-Mendieta, Osnieski Martín-Hernández
Removal potentials of a surfactant modified zeolite (SMZ) and clay (SMC) for atrazine adsorption were evaluated. Materials were modified with hexadecyl trimethyl ammonium bromide (HDTMA) and benzyl octadecyl dimethyl ammonium chloride (BODA) considering the critical miscelar concentration (CMC) of each one (0.94 and 0.041 meq/L, respectively). The influence of the surfactant was analyzed in detail, particularly the formation of surfactant layers (complete or partial) connected with the length of the surfactant tail (16 and 18 methyl groups or number of carbons in the chain)...
August 7, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28780962/applicability-of-the-gibbs-adsorption-isotherm-to-the-analysis-of-experimental-surface-tension-data-for-ionic-and-nonionic-surfactants
#17
REVIEW
L Martínez-Balbuena, Araceli Arteaga-Jiménez, Ernesto Hernández-Zapata, César Márquez-Beltrán
The Gibbs Adsorption Isotherm equation is a two-dimensional analogous of the Gibbs-Duhem equation, and it is one of the cornerstones of interface science. It is also widely used to estimate the surface excess concentration (SEC) for surfactants and other compounds in aqueous solution, from surface tension measurements. However, in recent publications some authors have cast doubt on this method. In the present work, we review some of the best available surface tension experimental data, and compare estimations of the SEC, using the Gibbs isotherm method (GIM), to direct measurements reported in the literature...
July 21, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28774431/rapid-biomimetic-remineralization-of-the-demineralized-enamel-surface-using-nano-particles-of-amorphous-calcium-phosphate-guided-by-chimaeric-peptides
#18
Zuohui Xiao, Kehua Que, Haorong Wang, Ran An, Zhen Chen, Zhongjun Qiu, Mingli Lin, Jinhua Song, Jie Yang, Danyang Lu, Minjuan Shen, Binbin Guan, Yinghui Wang, Xuliang Deng, Xiaoping Yang, Qing Cai, Jiaying Deng, Li Ma, Xi Zhang, Xu Zhang
OBJECTIVE: The objective of this study was to develop a rapid and effective method to remineralize human carious-like enamel using chimaeric peptide-mediated nanocomplexes of carboxymethyl chitosan/amorphous calcium phosphate (CMC/ACP), mimicking the mineralizing pattern of the oriented assembly of ACP guided by amelogenin in the biomineralization of enamel. METHODS: CMC/ACP nanocomplex solution was first synthesized through the successive addition of carboxymethyl chitosan, calcium chloride, and dipotassium phosphate into distilled water...
July 31, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28774234/multiple-carpometacarpal-dislocations-of-the-hand-an-uncommon-variant-a-rare-case
#19
Milind Deshpande, Tanvir Doomra, Sambaprassad Nadkarni
Carpometacarpal fracture dislocations of the hand are a relatively uncommon injury. The injury is difficult to diagnose because of the gross swelling of the hand. The diagnosis of this unusual form of injury requires a high index of suspicion, vigilant examination and high-quality radiography. This article reports a case of young male grieved with dislocation of all carpometacarpal (CMC) joints due to motor vehicle collision. Standard radiographs and CT scan revealed dorsal dislocations of second to fourth CMC joints, volar fracture dislocation of fifth carpometacarpal joint, fracture dislocation of CMC joint of thumb and dorsal dislocation of the trapezoid...
September 2017: Journal of Hand Surgery Asian-Pacific Volume
https://www.readbyqxmd.com/read/28773019/fatigue-lifetime-of-ceramic-matrix-composites-at-intermediate-temperature-by-acoustic-emission
#20
Elie Racle, Nathalie Godin, Pascal Reynaud, Gilbert Fantozzi
The fatigue behavior of a Ceramic Matrix Composite (CMC) at intermediate temperature under air is investigated. Because of the low density and the high tensile strength of CMC, they offer a good technical solution to design aeronautical structural components. The aim of the present study is to compare the behavior of this composite under static and cyclic loading. Comparison between incremental static and cyclic tests shows that cyclic loading with an amplitude higher than 30% of the ultimate tensile strength has significant effects on damage and material lifetimes...
June 16, 2017: Materials
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