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https://www.readbyqxmd.com/read/28822139/confocal-raman-mapping-of-collagen-cross-link-and-crystallinity-of-human-dentin-enamel-junction
#1
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/28821657/fronto-parietal-structural-connectivity-in-childhood-predicts-development-of-functional-connectivity-and-reasoning-ability-a-large-scale-longitudinal-investigation
#2
Carter Wendelken, Emilio Ferrer, Simona Ghetti, Stephen Bailey, Laurie Cutting, Silvia A Bunge
Prior research points to a positive concurrent relationship between reasoning ability and both fronto-parietal structural connectivity, as measured by diffusion tensor imaging (e.g. Tamnes et al., 2010), and fronto-parietal functional connectivity, as measured by fMRI (e.g. Cocchi et al., 2014). Further, recent research demonstrates a link between reasoning ability and functional connectivity of two brain regions in particular: rostrolateral prefrontal cortex (RLPFC) and the inferior parietal lobe (IPL) (Wendelken et al...
August 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28821507/social-capital-neighbourhood-characteristics-and-utilisation-of-local-public-health-services-among-domestic-migrants-in-china-a-cross-sectional-study
#3
Zhiyuan Hou, Senlin Lin, Donglan Zhang
OBJECTIVES: We examined the association between structural social capital and public health services use, and explored the modifiable effect of neighbourhood factors on this association among domestic migrants in China. METHODS: Data were from a 2014 nationally representative cross-sectional sample of domestic migrants aged 15-59 years in China. Survey-weighted logistic regression models were applied to assess the association between structural social capital, measured by participation in social organisations and social activities, and use of public health services...
August 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28821180/infant-acceptance-of-primary-tastes-and-fat-emulsion-developmental-changes-and-links-with-maternal-and-infant-characteristics
#4
Camille Schwartz, Claire Chabanet, Emilie Szleper, Valérie Feyen, Sylvie Issanchou, Sophie Nicklaus
Previous studies on taste acceptance have been conducted taste-by-taste and with a cross-sectional design. The aim of this study was to longitudinally evaluate the acceptance of sweet, salty, bitter, sour and umami solutions, and a fat emulsion comparatively in a birth cohort from 3 to 20 months old. The acceptance of each taste relative to water was defined using proportional variables that are based on ingestion (IR) or liking evaluated by the experimenter (LR). These data were analyzed with mixed models that accounted for age and subject effects (minimum 152 observations/age/taste; maximum 216)...
September 1, 2017: Chemical Senses
https://www.readbyqxmd.com/read/28821139/charge-functionalized-and-mechanically-durable-composite-cryogels-from-q-nfc-and-cs-for-highly-selective-removal-of-anionic-dyes
#5
Yufei Chen, Jing Ru, Biyao Geng, Haiying Wang, Congcong Tong, Chungui Du, Shengchun Wu, Hongzhi Liu
A composite cryogel was prepared from quaternized nanofibrillated cellulose (Q-NFC) and chitosan (CS) through a combination of freeze-drying and cross-linking with epichlorohydrin. The specific surface area of the composite cryogel was approximately two times that of Q-NFC cryogel. And the composite cryogel exhibited superior adsorption properties of anionic dyes than either the Q-NFC or CS cryogel controls. The adsorption isotherm well fitted the Langmuir model with the maximum theoretical adsorption capacity up to 473...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821130/reaction-pattern-differences-impact-physical-properties-of-starches-derivatized-to-the-same-extent-in-a-model-cross-linking-system
#6
Jung Sun Hong, Sara V Gomand, Kerry C Huber, Jan A Delcour
This study investigated the physical properties of maize (MS) and wheat (WS) starches derivatized with 5-(4,6-dichlorotriazinyl)aminofluorescein (model cross-linking system) to have the same overall fluorescence intensity on starch molecules, but reacted either more uniformly throughout granules (UD) or more at granule surfaces (SD). Both MS and WS derivatives had lower swelling powers (SP) at 90°C than their respective native starches. The UD derivatives had lower SP (90°C) and greater retrogradation enthalpies than did SD derivatives, consistent with their lower peak and higher setback pasting viscosities...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821097/thiolated-pectin-doxorubicin-conjugates-synthesis-characterization-and-anticancer-activity-studies
#7
Kamonrak Cheewatanakornkool, Sathit Niratisai, Somkamol Manchun, Crispin R Dass, Pornsak Sriamornsak
In this paper, pectin was cross-linked by a coupling reaction with either thioglycolic acid or cystamine dihydrochloride to form thiolated pectins. The thiolated pectins were then coupled with doxorubicin (DOX) derivative to obtain thiolated pectin-DOX conjugates by two different methods, disulfide bond formation and disulfide bond exchange. The disulfide bond exchange method provided a simple, fast, and efficient approach for synthesis of thiolated pectin-DOX conjugates, compared to the disulfide bond formation...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821089/preparation-and-evaluation-of-chitosan-alginate-porous-microspheres-bletilla-striata-polysaccharide-composite-hemostatic-sponges
#8
Chao Wang, Wenfeng Luo, Puwang Li, Sidong Li, Ziming Yang, Zhang Hu, Yangyang Liu, Ningjian Ao
We prepared a novel hemostatic material using chitosan (CS), alginate, and Bletilla striata, which showed good biocompatibility and hemostatic properties. Alginate-calcium porous microspheres (Alg) were prepared by emulsification/cross-linking methods, and Bletilla striata polysaccharide (Bsp) was extracted from the tubers by water extraction and alcohol precipitation. To improve the water absorption and accelerate the blood coagulation, Alg and Bsp were mixed with chitosan solution to form CS/Alg and CS/Alg/Bsp composite sponges by lyophilization...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821088/microparticles-prepared-with-50-190kda-chitosan-as-promising-non-toxic-carriers-for-pulmonary-delivery-of-isoniazid
#9
Paula M Oliveira, Breno N Matos, Priscilla A T Pereira, Taís Gratieri, Lucia H Faccioli, Marcílio S S Cunha-Filho, Guilherme M Gelfuso
Chitosan biocompatibility and mucoadhesiveness make it an ideal polymer for antituberculotic drugs microcapsulation for pulmonary delivery. Yet, previous study indicated toxicity problems to J-774.1-cells treated with some medium molecular weight (190-310kDa) chitosan microparticles. As polymer molecular weight is a crucial factor to be considered, this paper describes the preparation and characterization of chitosan (50-190kDa) microparticles containing isoniazid (INH). Cytotoxicity assays were also performed on murine peritoneal (J-774...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821063/development-and-characterization-of-banana-flour-film-incorporated-with-montmorillonite-and-banana-starch-nanoparticles
#10
Aungkana Orsuwan, Rungsinee Sothornvit
Banana flour film is an alternative biopolymer material but still needs improvement of its mechanical properties and water vapor permeability. Banana starch nanoparticles (BSNs), prepared using miniemulsion cross-linking, make an interesting reinforcing agent. The properties of plasticized banana flour film (PBF) were characterized incorporated with 5% (w/w) of either montmorillonite; MMT-Na(+) (PBF-M) or BSN (PBF-B), including a mixture of nanoparticles at 1:1 for 5% (PBF-MB5) and 10% (PBF-MB10). PBF-MB5 provided better improvement in the film mechanical and water barrier properties compared with PBF-B...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28821054/enhanced-hydrolysis-of-bamboo-biomass-by-chitosan-based-solid-acid-catalyst-with-surfactant-addition-in-ionic-liquid
#11
Wenqing Si, Yichen Li, Jie Zheng, Shun'an Wei, Dan Wang
Surfactants were used for the hydrolysis of bamboo biomass to enhance lignocellulose hydrolysis. Tween 80, polyethylene glycol 4000 (PEG 4000), and sodium dodecyl sulfate (SDS) were tested as surfactants for improving the bamboo hydrolysis with a novel sulfonated cross-linked chitosan solid acid catalyst (SCCAC) in ionic liquid (IL). Compared to the use of only SCCAC in 1-Butyl-3-methylimidazolium chloride ([BMIM]Cl), the surfactants facilitated hydrolysis and improved the yield of total reducing sugar (TRS) under the same conditions...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820997/nh2fe3o4-sio2-supported-peroxidase-catalyzed-h2o2-for-degradation-of-endocrine-disrupter-from-aqueous-solution-roles-of-active-radicals-and-noms
#12
Jing Ai, Weijun Zhang, Guiying Liao, Hua Xia, Dongsheng Wang
In this work, magnetic Fe3O4 was utilized to immobilize horseradish peroxidase (IM-HRP) in order to improve its stability and reusability by crosslinking method process with glutaraldehyde. The physicochemical properties of NH2Fe3O4@SiO2 and IM-HRP were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Thermo-gravimetric Analysis (TGA) and Transmission electron microscopy (TEM). The thermal stability of immobilized-HRP was considerably improved in comparison with free counterpart...
August 13, 2017: Chemosphere
https://www.readbyqxmd.com/read/28820957/the-association-between-pregnancy-intention-and-breastfeeding
#13
Shimrit Keddem, Rosemary Frasso, Melissa Dichter, Alexandra Hanlon
BACKGROUND: Although breastfeeding is associated with proven benefits to both mother and child, there are many factors that influence a mother's decision to breastfeed. Pregnancy intentionality at the time of conception is associated with postpartum maternal behavior including breastfeeding. Research aim: We sought to understand how maternal and paternal pregnancy intentions were associated with breastfeeding initiation and duration in a nationally representative sample. METHODS: We used a cross-sectional, retrospective study of the CDC National Survey of Family Growth data to examine the link between pregnancy intentionality and breastfeeding initiation and duration among women ages 15 to 44 years...
August 1, 2017: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
https://www.readbyqxmd.com/read/28820911/phosphatidlyinositol-3-kinase-c2-beta-pi3kc2%C3%AE-is-a-potential-new-target-to-treat-ige-mediated-disease
#14
Shekhar Srivastava, Zhai Li, Edward Y Skolnik
Cross linking of the IgE receptor (FcεRI) on mast cells plays a critical role in IgE-dependent allergy including allergic rhinitis, asthma, anaphylaxis, and delayed type hypersensitivity reactions. The Ca2+ activated K+ channel, KCa3.1, plays a critical role in IgE-stimulated Ca2+ entry and degranulation in mast cells by helping to maintain a negative membrane potential, which provides an electrochemical gradient to drive Ca2+ influx. Of the 3 classes of PI3K, the class II PI3Ks are the least studied and little is known about the roles for class II PI3Ks in vivo in the context of the whole organism under normal and pathological conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28820695/prevalence-and-seroprevalence-of-trypanosoma-cruzi-infection-in-a-military-population-in-texas
#15
Bryant J Webber, Mary T Pawlak, Sandra Valtier, Candelaria C Daniels, Charla C Tully, Edward J Wozniak, Walter D Roachell, Francisco X Sanchez, Audra A Blasi, Thomas L Cropper
Recent biosurveillance findings at Joint Base San Antonio (JBSA), a large military installation located in south-central Texas, indicate the potential for vector-borne human Chagas disease. A cross-sectional study was conducted to determine the prevalence and seroprevalence of Trypanosoma cruzi infection in highest risk subpopulations on the installation, including students and instructors who work and sleep in triatomine-endemic field settings. Real-time polymerase chain reaction, enzyme-linked immunosorbent assay, and indirect immunofluorescent antibody assay were performed on enrolled subjects (N = 1,033), none of whom tested positive for T...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820469/a-third-generation-glucose-biosensor-based-on-cellobiose-dehydrogenase-immobilized-on-a-glassy-carbon-electrode-decorated-with-electrodeposited-gold-nanoparticles-characterization-and-application-in-human-saliva
#16
Paolo Bollella, Lo Gorton, Roland Ludwig, Riccarda Antiochia
Efficient direct electron transfer (DET) between a cellobiose dehydrogenase mutant from Corynascus thermophilus (CtCDH C291Y) and a novel glassy carbon (GC)-modified electrode, obtained by direct electrodeposition of gold nanoparticles (AuNPs) was realized. The electrode was further modified with a mixed self-assembled monolayer of 4-aminothiophenol (4-APh) and 4-mercaptobenzoic acid (4-MBA), by using glutaraldehyde (GA) as cross-linking agent. The CtCDH C291Y/GA/4-APh,4-MBA/AuNPs/GC platform showed an apparent heterogeneous electron transfer rate constant (ks) of 19...
August 18, 2017: Sensors
https://www.readbyqxmd.com/read/28820431/high-throughput-screening-assay-for-laccase-engineering-toward-lignosulfonate-valorization
#17
David Rodríguez-Escribano, Felipe de Salas, Isabel Pardo, Susana Camarero
Lignin valorization is a pending issue for the integrated conversion of lignocellulose in consumer goods. Lignosulfonates (LS) are the main technical lignins commercialized today. However, their molecular weight should be enlarged to meet application requirements as additives or dispersing agents. Oxidation of lignosulfonates with fungal oxidoreductases, such as laccases, can increase the molecular weight of lignosulfonates by the cross-linking of lignin phenols. To advance in this direction, we describe here the development of a high-throughput screening (HTS) assay for the directed evolution of laccases, with lignosulfonate as substrate and the Folin-Ciocalteau reagent (FCR), to detect the decrease in phenolic content produced upon polymerization of lignosulfonate by the enzyme...
August 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28820312/architecture-of-the-atg2b-wdr45-complex-and-an-aromatic-y-hf-motif-crucial-for-complex-formation
#18
Jing-Xiang Zheng, Yan Li, Yue-He Ding, Jun-Jie Liu, Mei-Jun Zhang, Meng-Qiu Dong, Hong-Wei Wang, Li Yu
PtdIns3P signaling is critical for dynamic membrane remodeling during autophagosome formation. Proteins in the Atg18/WIPI family are PtdIns3P-binding effectors which can form complexes with proteins in the Atg2 family, and both families are essential for macroautophagy/autophagy. However, little is known about the biophysical properties and biological functions of the Atg2-Atg18/WIPI complex as a whole. Here, we demonstrate that an ortholog of yeast Atg18, mammalian WDR45/WIPI4 has a stronger binding capacity for mammalian ATG2A or ATG2B than the other 3 WIPIs...
August 18, 2017: Autophagy
https://www.readbyqxmd.com/read/28820240/the-interaction-between-the-third-type-iii-domain-from-fibronectin-and-anastellin-involves-%C3%AE-strand-exchange
#19
Jessica M Stine, Gabriel J H Ahl, Casey Schlenker, Domnita-Valeria Rusnac, Klára Briknarová
Anastellin is a small recombinant fragment derived from the extracellular matrix protein fibronectin; it comprises the first type III (FN3) domain without the two N-terminal β-strands. It inhibits angiogenesis, tumor growth, and metastasis in mouse models and requires endogenous fibronectin for its in vivo anti-angiogenic activity. It binds to fibronectin in vitro and converts the soluble protein to insoluble fibrils that structurally and functionally resemble fibronectin fibrils deposited in the extracellular matrix by cells...
August 18, 2017: Biochemistry
https://www.readbyqxmd.com/read/28819618/serum-levels-of-cyfra-21-in-patients-with-benign-and-malignant-salivary-gland-tumors
#20
Naghmeh Jeiroodi, Seyed Mohammad-Javad Aslani, Bijan Khademi, Mahyar Malekzadeh, Zohreh Jaafari-Ashkavandi
INTRODUCTION: Cyfra 21 is a serum-soluble fragment of cytokeratin19. Increased Cyfra 21 serum levels and their benefit as a tumor marker have been shown in some malignancies. This study aimed to evaluate the serum levels of Cyfra 21 in patients with benign and malignant salivary gland tumors. MATERIALS AND METHODS: In this cross-sectional study, the serum level of Cyfra 21 in 44 patients with malignant salivary gland tumors and 16 cases of pleomorphic adenoma were compared with 28 healthy controls using enzyme-linked immunosorbent assay (ELISA)...
July 2017: Iranian Journal of Otorhinolaryngology
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