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https://www.readbyqxmd.com/read/28813078/quality-of-life-in-parkinson-s-disease-patients-progression-markers-of-mild-to-moderate-stages
#1
Raissa Carla Moreira, Marise Bueno Zonta, Ana Paula Serra de Araújo, Vera Lúcia Israel, Hélio A G Teive
Objective: To investigate which factors are associated with the quality of life decline in Parkinson's disease patients from mild to moderate stages. Methods: The Unified Parkinson's Disease Rating Scale and Parkinson's Disease Questionnaire-39 were used to evaluate clinical/functional data and the quality of life. Results: The markers of clinical/functional worsening were drooling (p < 0.004), need for assistance with hygiene (p = 0.02), greater freezing frequency (p = 0...
August 2017: Arquivos de Neuro-psiquiatria
https://www.readbyqxmd.com/read/28812348/inhibition-of-heterogeneous-ice-nucleation-by-bioinspired-coatings-of-polyampholytes
#2
Zhiyuan He, Liuchun Zheng, Zhenqi Liu, Shenglin Jin, Chuncheng Li, Jianjun Wang
Controlling of heterogeneous ice nucleation (HIN) on foreign surfaces is of great importance for anti-ice nucleation material design. In this work, we studied the HIN behaviors on various ion-modified poly(butylene succinate) (PBS) surfaces via chain-extension reaction. Inspired by antifreeze proteins (AFPs), the PBS-based polyampholytes, containing both negative and positive charge groups on a single chain, show excellent performance of ice nucleation inhibition and freezing delay. Unlike the extremely high price and low availability of AFPs, these PBS-based polyampholytes can be commercially synthesized under mild reaction conditions...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28811868/selaginella-bryopteris-aqueous-extract-improves-stability-and-function-of-cryopreserved-human-mesenchymal-stem-cells
#3
Abhishek Kumar Singh, Anubhuti Jha, Arindam Bit, Andrey P Kiassov, Albert A Rizvanov, Archit Ojha, Pooja Bhoi, Pradeep Kumar Patra, Awanish Kumar, Akalabya Bissoyi
The effective long-term cryopreservation of human mesenchymal stem cells (MSCs) is an essential prerequisite step and represents a critical approach for their sustained supply in basic research, regenerative medicine, and tissue engineering applications. Therefore, attempts have been made in the present investigation to formulate a freezing solution consisting of a combination of Selaginella bryopteris water-soluble extract with and without dimethyl sulfoxide (Me2SO) for the efficient long-term storage of human umbilical cord blood- (hUCB-) derived MSCs...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28810960/talk-to-the-hand-u-s-army-biophysical-testing
#4
William R Santee, Adam W Potter, Karl E Friedl
BACKGROUND: Many people are unaware of the science underlying the biophysical properties of Soldier clothing and personal protective equipment, yet there is a well-refined biomedical methodology initiated by Army physiologists in World War II. This involves a methodical progression of systematic material testing technologies, computer modeling, and human testing that enables more efficient development and rapid evaluation of new concepts for Soldier health and performance. Sophisticated manikins that sweat and move are a central part of this testing continuum...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28810776/perspective-surface-freezing-in-water-a-nexus-of-experiments-and-simulations
#5
Amir Haji-Akbari, Pablo G Debenedetti
Surface freezing is a phenomenon in which crystallization is enhanced at a vapor-liquid interface. In some systems, such as n-alkanes, this enhancement is dramatic and results in the formation of a crystalline layer at the free interface even at temperatures slightly above the equilibrium bulk freezing temperature. There are, however, systems in which the enhancement is purely kinetic and only involves faster nucleation at or near the interface. The first, thermodynamic, type of surface freezing is easier to confirm in experiments, requiring only the verification of the existence of crystalline order at the interface...
August 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28810604/hard-clam-extracts-induce-atypical-apoptosis-in-human-gastric-cancer-cells
#6
Eing-Ju Song, Michael W Y Chan, Jyh-Wei Shin, Che-Chun Chen
Hard clams (HCs) are a nutritionally high-quality and popular seafood, and are established to be a potent antitumor food. The aim of the present study was to determine whether HC extracts induce apoptosis in the human gastric cancer cell line, AGS. In contrast with previously reported methods of extraction, crude extracts of HC were obtained by freezing and thawing and by a method free of hot water or organic solvents. The composition, quality and properties of the HC extracts were demonstrated to be stable since the extracts that were evaluated by capillary electrophoresis and HPLC analysis at different timepoints were similar...
August 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28809747/oxidation-of-pth-in-vivo-feature-or-effect-of-preanalytical-conditions
#7
Stan R Ursem, Marc G Vervloet, Jacquelien J G Hillebrand, Renate T de Jongh, Annemieke C Heijboer
BACKGROUND: Posttranslational oxidation of parathyroid hormone (PTH) modifies its biological activity. Measurement of non-oxidized PTH (n-oxPTH) could be an improvement in assessing PTH status, as intact PTH may rather reflect oxidative stress. However, it is debated whether oxidation of PTH occurs in vivo, or whether it is mainly an in vitro artifact. The aim of this study was to investigate the influence of different preanalytical conditions on the oxidation of PTH within a wide range of plasma PTH concentrations and oxidation propensity...
August 15, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28808947/the-sydney-heart-bank-improving-translational-research-while-eliminating-or-reducing-the-use-of-animal-models-of-human-heart-disease
#8
REVIEW
C G Dos Remedios, S P Lal, A Li, J McNamara, A Keogh, P S Macdonald, R Cooke, E Ehler, R Knöll, S B Marston, J Stelzer, H Granzier, C Bezzina, S van Dijk, F De Man, G J M Stienen, J Odeberg, F Pontén, W Linke, J van der Velden
The Sydney Heart Bank (SHB) is one of the largest human heart tissue banks in existence. Its mission is to provide high-quality human heart tissue for research into the molecular basis of human heart failure by working collaboratively with experts in this field. We argue that, by comparing tissues from failing human hearts with age-matched non-failing healthy donor hearts, the results will be more relevant than research using animal models, particularly if their physiology is very different from humans. Tissue from heart surgery must generally be used soon after collection or it significantly deteriorates...
August 14, 2017: Biophysical Reviews
https://www.readbyqxmd.com/read/28808811/construction-and-biocompatibility-of-a-thin-type-i-ii-collagen-composite-scaffold
#9
Long Han, Zhong-Wen Zhang, Bo-He Wang, Zhen-Kun Wen
Articular cartilage injury is a common type of damage observed in clinical practice. A matrix-induced autologous chondrocyte implant was developed to repair articular cartilage as an advancement on the autologous chondrocyte implant procedure. Here, we establish a thin double layer of collagen as a novel and effective bioscaffold for the regeneration of cartilaginous lesions. We created a collagen membrane with double layers using a cover slip, a cover slip, and the collagen was then freeze-dried under vacuum...
August 14, 2017: Cell and Tissue Banking
https://www.readbyqxmd.com/read/28808769/the-genetic-characteristics-in-cytology-and-plant-physiology-of-two-wheat-triticum-aestivum-near-isogenic-lines-with-different-freezing-tolerances
#10
Wenqiang Wang, Qunqun Hao, Wenlong Wang, Qinxue Li, Wei Wang
Freezing tolerance in taft plants relied more upon an ABA-independent- than an ABA-dependent antifreeze signaling pathway. Two wheat (Triticum aestivum) near isogenic lines (NIL) named tafs (freezing sensitivity) and taft (freezing tolerance) were isolated in the laboratory and their various cytological and physiological characteristics under freezing conditions were studied. Proplastid, cell membrane, and mitochondrial ultrastructure were less damaged by freezing treatment in taft than tafs plants. Chlorophyll, ATP, and thylakoid membrane protein contents were significantly higher, but malondialdehyde content was significantly lower in taft than tafs plants under freezing condition...
August 14, 2017: Plant Cell Reports
https://www.readbyqxmd.com/read/28808249/magnetic-moment-evolution-and-spin-freezing-in-doped-bafe2as2
#11
Jonathan Pelliciari, Yaobo Huang, Kenji Ishii, Chenglin Zhang, Pengcheng Dai, Gen Fu Chen, Lingyi Xing, Xiancheng Wang, Changqing Jin, Hong Ding, Philipp Werner, Thorsten Schmitt
Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μ bare in electron- and hole-doped BaFe2As2. At low temperature, μ bare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μ bare in the hole-doped region, which is naturally explained by the theoretically predicted crossover into a spin-frozen state. Our measurements demonstrate the importance of Hund's-coupling and electronic correlations, especially for hole-doped BaFe2As2, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28808235/direct-ink-write-diw-3d-printed-cellulose-nanocrystal-aerogel-structures
#12
Vincent Chi-Fung Li, Conner K Dunn, Zhe Zhang, Yulin Deng, H Jerry Qi
Pure cellulose nanocrystal (CNC) aerogels with controlled 3D structures and inner pore architecture are printed using the direct ink write (DIW) technique. While traditional cellulosic aerogel processing approaches lack the ability to easily fabricate complete aerogel structures, DIW 3D printing followed by freeze drying can overcome this shortcoming and can produce CNC aerogels with minimal structural shrinkage or damage. The resultant products have great potential in applications such as tissue scaffold templates, drug delivery, packaging, etc...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807763/effects-of-2-2-4-4-tetrabromodiphenyl-ether-on-neurobehavior-and-memory-change-and-bcl-2-c-fos-grin1b-and-lingo1b-gene-expression-in-male-zebrafish-danio-rerio
#13
Shukai Zheng, Caixia Liu, Yanhong Huang, Mian Bao, Yuanni Huang, Kusheng Wu
Polybrominated diphenyl ethers (PBDEs) are persistent organic pollutants in various environmental matrices and organisms and pose a threat to neural systems of organisms. However, though quite a few studies have explored the effect of PBDEs on neural behaviors such as learning and memory abilities in animals, their mechanisms are less known. We used the zebrafish model to evaluate neurotoxicity of PBDEs and observe changes in behavior and related gene expression. In behavioral testing, 50 zebrafish were divided into five groups treated with different concentrations of BDE-47...
August 11, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28807691/size-optimization-and-in-vitro-biocompatibility-studies-of-chitosan-nanoparticles
#14
Thandapani Gomathi, P Supriya Prasad, P N Sudha, Sukumaran Anil
Chitosan (CS), an amino polysaccharide has fascinating scientific applications due to its many flexible properties. The advantages of Chitosan tend to increase when it was modified. Thus, in the present research work, to improve the properties of chitosan, it was converted into chitosan nanoparticles (CS-NPs) through the ionic gelation method using sodium tripoyphosphate (TPP) and sodium hexametaphosphate (SHMP) as a crosslinker. The size optimization was done by varying the parameters such as crosslinker concentration, agitation method and rate, agitation time, temperature and drying method...
August 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28807689/effects-of-polysaccharides-from-abalone-viscera-haliotis-discus-hannai-ino-on-mgc-803cells-proliferation
#15
Rui-Juan Zhang, Yan Shi, Jing Zheng, Xiao-Mei Mao, Zhi-Yu Liu, Qing-Xi Chen, Qin Wang
The polysaccharides (AVP) was obtained from abalone (Haliotis discus hannai Ino) viscera, using the alkaline protease to enzymolysis, sevage method and repeated freezing and thawing method to remove protein and hydrogen peroxide method to depigment. The total sugar content was 46.27±1.5% and uronic acid, sulfate radical, hexosamine and protein contents were 17.44±0.22%, 16.98±0.15%, 0.65±0.02% and 1.64±0.13% in AVP respectively. The main monosaccharide compositions of AVP were D-galactose, D-xylose, D-mannose, D-glucose and D-glucuronic acid...
August 11, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28807609/cspb-of-an-arctic-bacterium-polaribacter-irgensii-kopri-22228-confers-extraordinary-freeze-tolerance
#16
Youn Hong Jung, Yoo Kyung Lee, Hong Kum Lee, Kyunghee Lee, Hana Im
Freezing temperatures are a major challenge for life at the poles. Decreased membrane fluidity, uninvited secondary structure formation in nucleic acids, and protein cold-denaturation all occur at cold temperatures. Organisms adapted to polar regions possess distinct mechanisms that enable them to survive in extremely cold environments. Among the cold-induced proteins, cold shock protein (Csp) family proteins are the most prominent. A gene coding for a Csp-family protein, cspB, was cloned from an arctic bacterium, Polaribacter irgensii KOPRI 22228, and overexpression of cspB greatly increased the freeze-survival rates of Escherichia coli hosts, to a greater level than any previously reported Csp...
July 31, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28807342/accuracy-and-interobserver-agreement-of-retroareolar-frozen-sections-in-nipple-sparing-mastectomies
#17
David A Suarez-Zamora, Luis E Barrera-Herrera, Mauricio A Palau-Lazaro, Fabio Torres-Franco, Alejandro Orozco-Plazas, Lisette Barreto-Hauzeur, Paula A Rodriguez-Urrego
In the last decades, surgical treatment of breast cancer has enormously changed. As a result, nipple-sparing mastectomy (NSM) has evolved as an oncologically safe and cosmetic approach. NSM includes a subareolar frozen section to evaluate malignancy. We determined the accuracy of subareolar frozen section diagnosis, analyzed the discrepancy factor, and estimated the interobserver agreement of frozen section in NSM. A retrospective review of all NSMs at our institution from 2009 to 2015 was performed. Frozen sections were compared to the final diagnoses to analyze the accuracy of subareolar frozen sections...
August 2017: Annals of Diagnostic Pathology
https://www.readbyqxmd.com/read/28805603/modern-human-sperm-freezing-effect-on-dna-chromatin-and-acrosome-integrity
#18
Tahereh Rahiminia, Akram Hosseini, Morteza Anvari, Saeed Ghasemi-Esmailabad, Ali Reza Talebi
OBJECTIVE: Presence of vitrification method in sperm freezing and the introduction of solid surface vitrification beside rapid freezing in vapour, opens an easy and safe way to help infertility centres. While the effects of cryopreservation on motility, morphology and viability of sperm are documented, the question of the probable alteration of sperm DNA, chromatin and acrosome integrity after freezing and thawing procedures in different methods is still controversial. MATERIALS AND METHODS: Normal sample were collected according to WHO strict criteria...
August 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28805458/thermal-inactivation-of-listeria-monocytogenes-and-salmonella-during-water-and-steam-blanching-of-vegetables
#19
Erdogan Ceylan, Wendy McMahon, Donna M Garren
Thermal inactivation of Listeria monocytogenes and Salmonella was evaluated on peas, spinach, broccoli, potatoes, and carrots that were treated with hot water and steam. One gram-positive bacterium, L. monocytogenes, and one gram-negative bacterium, Salmonella, were selected as pertinent human pathogens for evaluation. Samples were inoculated with a composite of five strains each of L. monocytogenes and Salmonella to achieve approximately 10(8) to 10(9) CFU/g. Inoculated samples were treated with hot water at 85 and 87...
September 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28805449/stallion-sperm-cryopreservation-using-various-permeating-agents-interplay-between-concentration-and-cooling-rate
#20
Harriëtte Oldenhof, Judith Bigalk, Christiane Hettel, Lawrence de Oliveira Barros, Bulat Sydykov, Árpád Cs Bajcsy, Harald Sieme, Willem F Wolkers
In this study, modeling and experimental approaches were used to investigate the interplay between cooling rate and protectant concentration for cryopreservation of stallion sperm. Glycerol (GLY), ethylene glycol (EG), dimethylformamide (DMF), propylene glycol (PG), and dimethyl sulfoxide (DMSO) were tested as cryoprotective agents (CPAs), using concentrations up to 1500 mM and cooling rates ranging from 5°C to 55°C min(-1). Modeling of the extent of sperm dehydration during freezing was done using previously determined values of the sperm membrane permeability to water to predict optimal cooling rates for cryopreservation...
August 14, 2017: Biopreservation and Biobanking
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