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https://www.readbyqxmd.com/read/28822336/cesium-sorption-reversibility-and-kinetics-on-illite-montmorillonite-and-kaolinite
#1
Chad B Durrant, James D Begg, Annie B Kersting, Mavrik Zavarin
Understanding sorption and desorption processes is essential to predicting the mobility of radionuclides in the environment. We investigate adsorption/desorption of cesium in both binary (Cs+one mineral) and ternary (Cs+two minerals) experiments to study component additivity and sorption reversibility over long time periods (500days). Binary Cs sorption experiments were performed with illite, montmorillonite, and kaolinite in a 5mM NaCl/0.7mM NaHCO3 solution (pH8) and Cs concentration range of 10(-3) to 10(-11)M...
August 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28822304/a-flow-through-elevated-temperature-and-pressure-nmr-apparatus-for-in-situ-co2-sequestration-studies
#2
Erika L Sesti, Jinlei Cui, Sophia E Hayes, Mark S Conradi
We report an apparatus for in-situ nuclear magnetic resonance (NMR) studies of chemical reactions of dissolved (13)CO2 with minerals (rock or powder) under continuous flow. The operating range of the apparatus is 18-150°C and 1-140bar. A flow pump is used to circulate a CO2-water solution, with a heated mixing vessel where CO2 gas equilibrates with a water solution. The NMR probe is built around a strong zirconia ceramic vessel, with o-ring sealed connections; the mineral is contained inside. The horizontal orientation of the zirconia vessels allows use of a radio frequency (rf) solenoid for improved spin sensitivity...
August 12, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28822300/drinking-water-to-reduce-alcohol-craving-a-randomized-controlled-study-on-the-impact-of-ghrelin-in-mediating-the-effects-of-forced-water-intake-in-alcohol-addiction
#3
Anne Koopmann, Katharina Lippmann, Rilana Schuster, Iris Reinhard, Patrick Bach, Georg Weil, Marcella Rietschel, Stephanie H Witt, Klaus Wiedemann, Falk Kiefer
BACKGROUND: Recent data suggest that ghrelin is involved in the pathophysiology of alcohol use disorders, affecting alcohol self-administration and craving. Gastric ghrelin secretion is reduced by stomach distension. We now tested the hypothesis whether the clinically well-known effects of high-volume water intake on craving reduction in alcoholism is mediated by acute changes in ghrelin secretion. METHODS: In this randomized human laboratory study, we included 23 alcohol-dependent male inpatient subjects who underwent alcohol cue exposure...
August 5, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28822276/exploiting-algal-mineralization-for-nanotechnology-bringing-coccoliths-to-the-fore
#4
REVIEW
Alastair W Skeffington, André Scheffel
Complex mineral structures are produced by many microalgal species. Pioneering work on diatom silica has demonstrated the potential of such structures in nanotechnology. The calcified scales of coccolithophores (coccoliths) have received less attention, but the large diversity of architectures make coccoliths attractive as parts for nano-devices. Currently coccolith calcite can be modified by the incorporation of metal ions or adsorption of enzymes to the surface, but genetic modification of coccolithophores may permit the production of coccoliths with customized architectures and surface properties...
August 16, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28822189/-determination-and-principal-component-analysis-of-mineral-elements-based-on-icp-oes-in-nitraria-roborowskii-fruits-from-different-regions
#5
Yuan-Yuan Yuan, Yu-Bi Zhou, Jing Sun, Juan Deng, Ying Bai, Jie Wang, Xue-Feng Lu
The content of elements in fifteen different regions of Nitraria roborowskii samples were determined by inductively coupled plasma-atomic emission spectrometry(ICP-OES), and its elemental characteristics were analyzed by principal component analysis. The results indicated that 18 mineral elements were detected in N. roborowskii of which V cannot be detected. In addition, contents of Na, K and Ca showed high concentration. Ti showed maximum content variance, while K is minimum. Four principal components were gained from the original data...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822139/confocal-raman-mapping-of-collagen-cross-link-and-crystallinity-of-human-dentin-enamel-junction
#6
Amel Slimani, Fares Nouioua, Alban Desoutter, Bernard Levallois, Frédéric J G Cuisinier, Hervé Tassery, Elodie Terrer, Hamideh Salehi
The separation zone between enamel and dentin [dentin-enamel junction (DEJ)] with different properties in biomechanical composition has an important role in preventing crack propagation from enamel to dentin. The understanding of the chemical structure (inorganic and organic components), physical properties, and chemical composition of the human DEJ could benefit biomimetic materials in dentistry. Spatial distribution of calcium phosphate crystallinity and the collagen crosslinks near DEJ were studied using confocal Raman microscopy and calculated by different methods...
August 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28822114/glycosylation-of-dentin-matrix-protein-1-is-a-novel-key-element-for-astrocyte-maturation-and-bbb-integrity
#7
Bo Jing, Chunxue Zhang, Xianjun Liu, Liqiang Zhou, Jiping Liu, Yinan Yao, Juehua Yu, Yuteng Weng, Min Pan, Jie Liu, Zuolin Wang, Yao Sun, Yi Eve Sun
The blood-brain barrier (BBB) is a tight boundary formed between endothelial cells and astrocytes, which separates and protects brain from most pathogens as well as neural toxins in circulation. However, detailed molecular players involved in formation of BBB are not completely known. Dentin matrix protein 1 (DMP1)-proteoglycan (PG), which is known to be involved in mineralization of bones and dentin, is also expressed in soft tissues including brain with unknown functions. In the present study, we reported that DMP1-PG was expressed in brain astrocytes and enriched in BBB units...
August 18, 2017: Protein & Cell
https://www.readbyqxmd.com/read/28821868/dysmobility-syndrome-and-risk-of-mortality-for-community-dwelling-middle-aged-and-older-adults-the-nexus-of-aging-and-body-composition
#8
Wei-Ju Lee, Li-Kuo Liu, An-Chun Hwang, Li-Ning Peng, Ming-Hsien Lin, Liang-Kung Chen
Dysmobility syndrome is a newly proposed concept to comprehensively consider bone-muscle-adiposity as a whole to associate with mortality and other adverse outcomes in the older adults. Little was known in Asian populations since the body composition was highly related to ethnicity. The study aimed to evaluate the association between dysmobility syndrome and mortality and to explore the most optimal operational definition for dysmobility syndrome. The prevalence of dysmobility syndrome was 3.9-10.1% based on different operational definitions of adiposity and skeletal muscle index...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821776/mineralization-and-preservation-of-an-extremotolerant-bacterium-isolated-from-an-early-mars-analog-environment
#9
F Gaboyer, C Le Milbeau, M Bohmeier, P Schwendner, P Vannier, K Beblo-Vranesevic, E Rabbow, F Foucher, P Gautret, R Guégan, A Richard, A Sauldubois, P Richmann, A K Perras, C Moissl-Eichinger, C S Cockell, P Rettberg, Marteinsson, E Monaghan, P Ehrenfreund, L Garcia-Descalzo, F Gomez, M Malki, R Amils, P Cabezas, N Walter, F Westall
The artificial mineralization of a polyresistant bacterial strain isolated from an acidic, oligotrophic lake was carried out to better understand microbial (i) early mineralization and (ii) potential for further fossilisation. Mineralization was conducted in mineral matrixes commonly found on Mars and Early-Earth, silica and gypsum, for 6 months. Samples were analyzed using microbiological (survival rates), morphological (electron microscopy), biochemical (GC-MS, Microarray immunoassay, Rock-Eval) and spectroscopic (EDX, FTIR, RAMAN spectroscopy) methods...
August 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28821457/spontaneous-mutation-of-dock7-results-in-lower-trabecular-bone-mass-and-impaired-periosteal-expansion-in-aged-female-misty-mice
#10
Phuong T Le, Kathleen A Bishop, David E Maridas, Katherine J Motyl, Daniel J Brooks, Kenichi Nagano, Roland Baron, Mary L Bouxsein, Clifford J Rosen
Misty mice (m/m) have a loss of function mutation in Dock7 gene, a guanine nucleotide exchange factor, resulting in low bone mineral density, uncoupled bone remodeling and reduced bone formation. Dock7 has been identified as a modulator of osteoblast number and in vitro osteogenic differentiation in calvarial osteoblast culture. In addition, m/m exhibit reduced preformed brown adipose tissue innervation and temperature as well as compensatory increase in beige adipocyte markers. While the low bone mineral density phenotype is in part due to higher sympathetic nervous system (SNS) drive in young mice, it is unclear what effect aging would have in mice homozygous for the mutation in the Dock7 gene...
August 15, 2017: Bone
https://www.readbyqxmd.com/read/28821456/hyperglycemia-is-associated-with-increased-bone-mineral-density-and-decreased-trabecular-bone-score-in-elderly-japanese-men-the-fujiwara-kyo-osteoporosis-risk-in-men-formen-study
#11
Masayuki Iki, Yuki Fujita, Katsuyasu Kouda, Akiko Yura, Takahiro Tachiki, Junko Tamaki, Renaud Winzenrieth, Yuho Sato, Jong-Seong Moon, Nozomi Okamoto, Norio Kurumatani
PURPOSE: Patients with type 2 diabetes mellitus (T2DM) have an increased fracture risk despite having higher areal bone mineral density (aBMD). This study aimed to clarify the association between glycemic and insulin resistance status and bone microarchitecture, and whether pentosidine and bone turnover markers play any roles in the association. METHODS: A total of 2012 community-dwelling men aged ≥65years completed baseline measurements of spine aBMD, fasting plasma glucose (FPG) and serum insulin, hemoglobin A1c (HbA1c), osteocalcin, type I procollagen N-terminal propeptide, type I collagen C-terminal crosslinking telopeptide, tartrate-resistant acid phosphatase isoenzyme 5b, pentosidine, height and weight and an interview regarding past disease history...
August 15, 2017: Bone
https://www.readbyqxmd.com/read/28821164/cape-gooseberry-physalis-peruviana-juice-as-a-modulator-agent-for-hepatocellular-carcinoma-linked-apoptosis-and-cell-cycle-arrest
#12
Hanaa A Hassan, Hanaa M Serag, Makwan S Qadir, Mohamed Fawzy Ramadan
BACKGROUND: Cape gooseberry (Physalis peruviana) fruit is highly nutritious with high content of health-promoting compounds including minerals, phenolic compounds, as well as vitamins A and C. Physalis peruviana fruits were used as mutagenic, antispasmodic, anticoagulant, and antileucemis agents. OBJECTIVE: The objective of the present work was to study the role of cape gooseberry juice (CG) as a natural modulator agent for adverse aspects associated with hepatocellular carcinoma (HCC)...
August 14, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28821153/combination-of-microsized-mineral-particles-and-rosin-as-a-basis-for-converting-cellulosic-fibers-into-sticky-superhydrophobic-paper
#13
Xiaoyan Yu, Peiwen Bian, Yang Xue, Xueren Qian, Haipeng Yu, Wenshuai Chen, Xiaohai Hu, Peng Wang, Dong Wu, Qinghui Duan, Limei Li, Jing Shen, Yonghao Ni
The unique features of cellulosic paper including flexibility, biodegradability, and low cost enables it as a versatile, sustainable biomaterial for promising applications. In the paper industry, microsized mineral particles are widely used in the production of printing/writing paper grades, while rosin derived from trees is the earliest internal sizing agent for paper hydrophobication. On the basis of existing commercial practices associated with the use of mineral particles and rosin in paper production, we present a process concept of converting cellulosic fibers (paper-grade pulp) into "sticky" superhydrophobic paper involving the use of microsized mineral particles and rosin (a tree-derived natural product, mainly a mixture of resin acids, especially abietic acid with chemical formula of C19H29COOH)...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821121/reductive-mineralization-of-cellulose-with-vanadium-iron-and-tungsten-chlorides-and-access-to-mxoy-metal-oxides-and-mxoy-c-metal-oxide-carbon-composites
#14
Aurélien Henry, Peter Hesemann, Johan G Alauzun, Bruno Boury
MxOy and MxOy/C composites (M=V, Fe and W) were obtained by mineralization of cellulose with several metal chlorides. Cellulose was used both as a templating agent and as an oxygen and a carbon source. Soluble chloride molecules (VOCl3 and WCl6) and a poorly soluble ionic chloride compound (FeCl3) were chosen as metal oxide precursors. In a first time, primary metal oxide/cellulose composites were obtained via a thermal treatment by reacting urea impregnated filter paper with the corresponding metal chlorides in an autoclave at 150°C after 3days...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821095/an-o-acetyl-glucomannan-from-the-rhizomes-of-curculigo-orchioides-structural-characterization-and-anti-osteoporosis-activity-in-vitro
#15
Xueqian Wang, Mengliu Zhang, Dawei Zhang, Shumei Wang, Chunyan Yan
Osteoporosis is characterized by a reduction in bone mass and bone mineral density, which weakens the bone. Due to the side effects associated with drugs that are currently used to treat this disease, an increasing number of studies have focused on the research of effective ingredients derived from natural products. In particular, polysaccharides extracted from Chinese herbal medicines have received increasing attention. In this study, we isolated a homogeneous polysaccharide (COP90-1) from the dried rhizomes of Curculigo orchioides, a famous traditional Chinese medicine that is widely used in China, and determined its structure using the combined methods of chemical and spectral analyses...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821055/improvement-of-silicate-cement-properties-with-bacterial-cellulose-powder-addition-for-applications-in-dentistry
#16
Georgeta Voicu, Sorin-Ion Jinga, Bogdan-Gabriel Drosu, Cristina Busuioc
The goal of this paper was to synthesize a new family of composites starting from mineral binder powders and biocellulose membranes, with applications in endodontics. An important achievement consisted in the crushing of biocellulose 3D structure in a polygranular powder via an hydrothermal treatment. Afterwards, the polymer powder was mixed with silicate cement powders synthesized through the sol-gel technique. The resulting hybrid materials were investigated by thermal analysis, X-ray diffraction, scanning electron microscopy and mechanical measurements...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821025/fabrication-and-characterization-of-water-dispersed-chitosan-nanofiber-poly-ethylene-glycol-diacrylate-calcium-phosphate-based-porous-composites
#17
Sachiko Nitta, Ayaka Komatsu, Taisei Ishii, Masatoshi Ohnishi, Atsuko Inoue, Hiroyuki Iwamoto
We evaluated the capacity of chitosan nanofiber (CNF)- and poly(ethylene glycol) (PEG)-based hydrogel/calcium phosphate hybrid (CNF-PEG/CaP) composites to act as scaffolding materials. CNF-PEG/CaP composites were fabricated by mineralization of CNF-PEG hydrogels using an alternate soaking method. The amount of CaP mineralized on CNF-PEG hydrogels increased as the ratio of CNF in the CNF-PEG hydrogel increased. Young's modulus of CNF-PEG/CaP hydrogels was enhanced by increase in CNF ratio. It was further confirmed that osteoblasts embedded on the CNF-PEG/CaP composites were viable after incubation for 5days and firmly attached to the CaP porous layer, forming an extensive cell-scaffold leading to cell-cell interactions...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820473/effect-of-pullulan-coating-on-postharvest-quality-and-shelf-life-of-highbush-blueberry-vaccinium-corymbosum-l
#18
Karolina Kraśniewska, Iwona Ścibisz, Małgorzata Gniewosz, Marta Mitek, Katarzyna Pobiega, Andrzej Cendrowski
Fruits form an important part of a healthy human diet as they contain many ingredients with proven pro-health effects such as vitamins, phenolic compounds, organic acids, fiber, and minerals. The purpose of this work was to evaluate the effect of pullulan coating on the quality and shelf life of highbush blueberry during storage. General appearance, weight loss, dry matter, soluble solid content, reducing sugars, content of L-ascorbic acid, phenolic compounds (total phenolics, phenolics acids and anthocyanins) were determined in uncoated and coated blueberries fruits...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28820323/non-surgical-model-for-alveolar-bone-regeneration-by-bone-morphogenetic-protein-2-7-gene-therapy
#19
Mariko Kawai, Yo-Hei Kataoka, Junya Sonobe, Hiromitsu Yamamoto, Masakazu Inubushi, Takuya Ishimoto, Takayoshi Nakano, Hiroki Maruyama, Jun-Ichi Miyazaki, Toshio Yamamoto, Kazuhisa Bessho, Kiyoshi Ohura
BACKGROUND: Alveolar bone is a critical tissue for tooth retention; however, once alveolar bone is lost, it may not spontaneously regenerate. Currently, bone grafts or artificial bone are commonly used for alveolar bone regeneration therapy. However, these therapies require surgical procedures, which present risks, particularly in aged patients. Therefore, the development of alveolar bone regeneration techniques that do not require surgical procedures is critical. It is well known that stem cells present in the periosteal and periodontal ligament may be induced to differentiate into osteogenic cells...
August 18, 2017: Journal of Periodontology
https://www.readbyqxmd.com/read/28819756/nanofibers-grafted-on-titanium-alloy-the-effects-of-fiber-alignment-and-density-on-osteoblast-mineralization
#20
Hsin-Yi Lin, Zhao-Xiang Peng
The surface of medical implant alloy Ti-6Al-4V was chemically modified to allow it to covalently bond with collagen/PVA nanofibers. These nanofibers were successfully attached to the Ti-6Al-4V surface in three different morphologies: randomly oriented high-density fiber, COL(H); randomly oriented low-density fiber, COL(L); and aligned high-density fiber, COL(A). The effects of the morphology of these covalently-bound collagen nanofibers on the growth and differentiation of osteoblasts were studied for 21 days...
August 17, 2017: Journal of Materials Science. Materials in Medicine
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