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https://www.readbyqxmd.com/read/28338421/harnessing-the-osteogenicity-of-in-vitro-stem-cell-derived-mineralized-extracellular-matrix-as-3d-biotemplate-to-guide-bone-regeneration
#1
Yoke Chin Chai, Johanna Bolander, Ioannis Papantoniou, Jennifer Patterson, Jef Vleugels, Jan Schrooten, Frank P Luyten
Advanced biomaterials that are capable of guiding robust bone regeneration are highly demanded for translational therapy of bone defects or bone augmentation in clinics. One of the strategic approaches is to produce tissue engineering (TE) constructs that mediate bone regeneration by recapitulating the natural bone formation or healing process. In this study, we aimed at producing devitalized mineralized carriers with augmented bone forming capacity via a modified culture protocol (i.e., culture conditions with high calcium and/or phosphate concentrations) that first promotes cell growth and, subsequently, mineralized extracellular matrix (ECM) deposition by human periosteum-derived osteoprogenitor cells (hPDCs) on additive manufactured three-dimensional (3D) porous titanium (Ti)-based scaffolds...
March 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28335754/the-structural-and-health-policy-environment-for-delivering-integrated-hiv-and-substance-use-disorder-treatments-in-puerto-rico
#2
Jared A Leff, Diana Hernández, Paul A Teixeira, Pedro C Castellón, Daniel J Feaster, Allan E Rodriguez, Jorge L Santana-Bagur, Sandra Miranda De León, José Vargas Vidot, Lisa R Metsch, Bruce R Schackman
BACKGROUND: HIV prevalence in Puerto Rico is nearly twice that of the mainland United States, a level that was substantially fueled by injection drug use. Puerto Rico has a longstanding history of health provision by the public sector that directly affects how HIV and substance use disorder (SUD) treatment services are provided and funded. As part of pre-implementation research for a randomized trial of a community-level intervention to enhance HIV care access for substance users in San Juan, Puerto Rico, we sought to understand the structural and health policy environment for providing HIV and SUD treatments...
March 23, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28334797/molecular-mechanism-governing-ratio-dependent-transcription-regulation-in-the-ccdab-operon
#3
Alexandra Vandervelde, Igor Drobnak, San Hadži, Yann G-J Sterckx, Thomas Welte, Henri De Greve, Daniel Charlier, Rouslan Efremov, Remy Loris, Jurij Lah
Bacteria can become transiently tolerant to several classes of antibiotics. This phenomenon known as persistence is regulated by small genetic elements called toxin-antitoxin modules with intricate yet often poorly understood self-regulatory features. Here, we describe the structures of molecular complexes and interactions that drive the transcription regulation of the ccdAB toxin-antitoxin module. Low specificity and affinity of the antitoxin CcdA2 for individual binding sites on the operator are enhanced by the toxin CcdB2, which bridges the CcdA2 dimers...
February 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28332396/salinity-dependent-contact-angle-alteration-in-oil-brine-silicate-systems-the-critical-role-of-divalent-cations
#4
Martin E J Haagh, Igor Siretanu, Michael H G Duits, Frieder Mugele
The effectiveness of water flooding oil recovery depends to an important extent on the competitive wetting of oil and water on the solid rock matrix. Here, we use macroscopic contact angle goniometry in highly idealized model systems to evaluate how brine salinity affects the balance of wetting forces and to infer the microscopic origin of the resulting contact angle alteration. We focus in particular on two competing mechanisms debated in the literature, namely double layer expansion and divalent cation bridging...
March 23, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28329678/human-rad52-captures-and-holds-dna-strands-increases-dna-flexibility-and-prevents-melting-of-duplex-dna-implications-for-dna-recombination
#5
Ineke Brouwer, Hongshan Zhang, Andrea Candelli, Davide Normanno, Erwin J G Peterman, Gijs J L Wuite, Mauro Modesti
Human RAD52 promotes annealing of complementary single-stranded DNA (ssDNA). In-depth knowledge of RAD52-DNA interaction is required to understand how its activity is integrated in DNA repair processes. Here, we visualize individual fluorescent RAD52 complexes interacting with single DNA molecules. The interaction with ssDNA is rapid, static, and tight, where ssDNA appears to wrap around RAD52 complexes that promote intra-molecular bridging. With double-stranded DNA (dsDNA), interaction is slower, weaker, and often diffusive...
March 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/28327441/structure-based-design-synthesis-and-biological-evaluation-of-amino-phosphonate-derivatives-as-human-glucokinase-activators
#6
Nanda Kumar Yellapu, Ravendra Babu Kilaru, Nagaraju Chamarthi, Sarma Pvgk, Bhaskar Matcha
Glucokinase (GK) is a potential therapeutic target of type 2 diabetes and GK activators (GKAs) represent a promising class of small organic molecules which enhance GK activity. Based on the configuration and conformation of the allosteric site of GK, we have designed a novel class of amino phosphonate derivatives in order to develop potent GKAs. The QSAR model developed using numerous descriptors revealed its potential with the best effective statistical values of RMSE=1.52 and r(2)=0.30. Moreover, application of this model on the present test set GKAs proved to be worthy to predict their activities as a better linear relationship was observed with RMSE=0...
March 2, 2017: Computational Biology and Chemistry
https://www.readbyqxmd.com/read/28323548/referral-to-treatment-for-hospitalized-medical-patients-with-an-alcohol-use-disorder-a-proof-of-concept-brief-intervention-study
#7
Lisa Berger, Jennifer Hernandez-Meier, John Hyatt, Michael Brondino
Substance misuse intervention in healthcare settings is becoming a US national priority, especially in the dissemination and implementation of Screening, Brief Intervention, and Referral to Treatment (SBIRT). Yet, the referral to treatment component of SBIRT is understudied. This proof-of-concept investigation tested an enhanced coordinated hospital-community two session brief intervention designed to facilitate the referral to treatment of hospitalized medical patients with an alcohol use disorder. Participants (N = 9) attended the second session of the brief intervention held in the community in most cases (56%), while one out of three (33%) received some level of post-brief intervention alcohol and/or other drug treatment...
March 21, 2017: Social Work in Health Care
https://www.readbyqxmd.com/read/28322343/unprecedented-simultaneous-enhancement-in-damage-tolerance-and-fatigue-resistance-of-zirconia-ta-composites
#8
A Smirnov, J I Beltrán, T Rodriguez-Suarez, C Pecharromán, M C Muñoz, J S Moya, J F Bartolomé
Dense (>98 th%) and homogeneous ceramic/metal composites were obtained by spark plasma sintering (SPS) using ZrO2 and lamellar metallic powders of tantalum or niobium (20 vol.%) as starting materials. The present study has demonstrated the unique and unpredicted simultaneous enhancement in toughness and strength with very high flaw tolerance of zirconia/Ta composites. In addition to their excellent static mechanical properties, these composites also have exceptional resistance to fatigue loading. It has been shown that the major contributions to toughening are the resulting crack bridging and plastic deformation of the metallic particles, together with crack deflection and interfacial debonding, which is compatible with the coexistence in the composite of both, strong and weak ceramic/metal interfaces, in agreement with predictions of ab-initio calculations...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28317857/enhanced-biennial-variability-in-the-pacific-due-to-atlantic-capacitor-effect
#9
Lei Wang, Jin-Yi Yu, Houk Paek
The El Niño-Southern Oscillation (ENSO) and the variability in the Pacific subtropical highs (PSHs) have major impacts on social and ecological systems. Here we present an Atlantic capacitor effect mechanism to suggest that the Atlantic is a key pacemaker of the biennial variability in the Pacific including that in ENSO and the PSHs during recent decades. The 'charging' (that is, ENSO imprinting the North Tropical Atlantic (NTA) sea surface temperature (SST) via an atmospheric bridge mechanism) and 'discharging' (that is, the NTA SST triggering the following ENSO via a subtropical teleconnection mechanism) processes alternate, generating the biennial rhythmic changes in the Pacific...
March 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28317383/design-rules-for-enhanced-interfacial-shear-response-in-functionalized-carbon-fiber-epoxy-composites
#10
Baris Demir, Luke Christian Henderson, Tiffany R Walsh
Carbon-fiber reinforced composites are ideal light-weighting candidates to replace traditional engineering materials. The mechanical performance of these composites results from a complex interplay of influences operating over several length- and time-scales. The mechanical performance may therefore be limited by many factors, one of which being the modest interfacial adhesion between the carbon fiber and the polymer. Surface chemical modification of the fiber, via surface grafting of molecules, is one possible strategy to enhance interactions across the fiber-polymer interface...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28317374/flexible-and-thermostable-graphene-sic-nanowires-foam-composites-with-tunable-electromagnetic-wave-absorption-properties
#11
Meikang Han, Xiaowei Yin, Zexin Hou, Changqing Song, Xinliang Li, Litong Zhang, Laifei Cheng
Three-dimensional (3D) flexible foams consisting of reduced graphene oxides (rGO) and in-situ grown SiC nanowires (NWs) were prepared using freeze-drying and carbothermal reduction process. By means of incorporating SiC nanowires into rGO foams, both the thermostability and electromagnetic absorption of the composites were improved. It was demonstrated that rGO/SiC NWs foams were thermostable beyond ~630 °C (90% weight retention in air atmosphere). As expected, rGO/SiC NWs foams in the poly (dimethylsiloxane) matrix achieved effective absorption in the entire X-band (8...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28316120/synergistic-effects-of-g-csf-and-bone-marrow-stromal-cells-on-nerve-regeneration-with-acellular-nerve-xenografts
#12
Hua Jia, Ying Wang, Tao Wang, Yi Dong, Wei-Li Li, Jun-Ping Li, Wen-Zhi Ma, Xiao-Jie Tong, Zhong-Yi He
Peripheral nerve defects result in severe denervation presenting sensory and motor functional incapacitation. Currently, a satisfactory therapeutic treatment promoting the repair of injured nerves is not available. As shown in our previous study, acellular nerve xenografts (ANX) implanted with bone marrow stromal cells (BMSCs) replaced allografts and promoted nerve regeneration. Additionally, granulocyte-colony stimulating factor (G-CSF) has been proven to mobilize supplemental cells and enhance vascularization in the niche...
March 18, 2017: Synapse
https://www.readbyqxmd.com/read/28306235/gcib-tof-sims-high-resolution-imaging-of-cardiolipin-speciation-in-the-brain-identification-of-molecular-losses-after-traumatic-injury
#13
Hua Tian, Louis J Sparvero, Andrew A Amoscato, Anna Bloom, Hulya Bayir, Valerian E Kagan, Nicholas Winograd
Gas cluster ion beam secondary ion mass spectrometry (GCIB-SIMS) has shown the full potential of mapping intact lipids in biological systems with better than 10 µm lateral resolution. This study investigated further the capability of GCIB-SIMS in imaging high-mass signals from intact cardiolipin (CL) and gangliosides in normal brain and the effect of a controlled cortical impact model (CCI) of traumatic brain injury (TBI) on their distribution. A combination of enzymatic and chemical treatments was employed to suppress the signals from the most abundant phospholipids (phosphatidylcholine (PC) and phosphatidylethanolamine (PE)) and enhance the signals from the low abundance CLs and gangliosides to allow their GCIB-SIMS detection at 8 and 16 µm spatial resolution...
March 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28303390/the-hydroperoxide-lyase-branch-of-the-oxylipin-pathway-protects-against-photoinhibition-of-photosynthesis
#14
Tatyana Savchenko, Denis Yanykin, Andrew Khorobrykh, Vasily Terentyev, Vyacheslav Klimov, Katayoon Dehesh
This study describes a new role for hydroperoxide lyase branch of oxylipin biosynthesis pathway in protecting photosynthetic apparatus under high light conditions. Lipid-derived signaling molecules, oxylipins, produced by a multi-branch pathway are central in regulation of a wide range of functions. The two most known branches, allene oxide synthase (AOS) and 13-hydroperoxide lyase (HPL) pathways, are best recognized as producers of defense compounds against biotic challenges. In the present work, we examine the role of these two oxylipin branches in plant tolerance to the abiotic stress, namely excessive light...
March 16, 2017: Planta
https://www.readbyqxmd.com/read/28301544/density-functional-theory-study-the-effects-of-oxygen-containing-functional-groups-on-oxygen-molecules-and-oxygen-atoms-adsorbed-on-carbonaceous-materials
#15
Xuejun Qi, Wenwu Song, Jianwei Shi
Density functional theory was used to study the effects of different types of oxygen-containing functional groups on the adsorption of oxygen molecules and single active oxygen atoms on carbonaceous materials. During gasification or combustion reactions of carbonaceous materials, oxygen-containing functional groups such as hydroxyl(-OH), carbonyl(-CO), quinone(-O), and carboxyl(-COOH) are often present on the edge of graphite and can affect graphite's chemical properties. When oxygen-containing functional groups appear on a graphite surface, the oxygen molecules are strongly adsorbed onto the surface to form a four-member ring structure...
2017: PloS One
https://www.readbyqxmd.com/read/28294210/anion-regulated-electronic-communication-in-a-cyclometalated-diruthenium-complex-with-a-urea-bridge
#16
Zhong-Liang Gong, Li-Ye Deng, Yu-Wu Zhong, Jiannian Yao
A combined study of electrochemical measurements, intervalence charge transfer analysis, and DFT calculations suggests that the degree of urea-mediated electronic coupling between two cyclometalated ruthenium sites is enhanced by the coordination of urea with Br(-) or Cl(-)via hydrogen bonding. In contrast, the redox waves of the diruthenium complex become highly irreversible in the presence of relatively strong basic anions such as H2PO4(-), F(-), or OAc(-). This work demonstrates that the anion-urea interaction can be employed to regulate the electronic coupling and electron transfer between redox-active sites, suggesting the potential applications of the urea-functionalized diruthenium complex in anion sensing and stimuli-responsive molecular electronics...
March 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28293900/enhancing-the-connection-between-the-classroom-and-the-clinical-workplace-a%C3%A2-systematic-review
#17
REVIEW
Sanne Peters, Geraldine Clarebout, Agnes Diemers, Nicolas Delvaux, An Verburgh, Bert Aertgeerts, Ann Roex
INTRODUCTION: Although medical students are increasingly exposed to clinical experiences as part of their training, these often occur parallel with, rather than connected to, their classroom-based learning experiences. Additionally, students seem to struggle with spontaneously making the connection between these spheres of their training themselves. Therefore, this systematic review synthesized the existing evidence about educational interventions that aim to enhance the connection between learning in the classroom and its application in the workplace...
March 14, 2017: Perspectives on Medical Education
https://www.readbyqxmd.com/read/28290670/enhancement-of-magnetocaloric-effect-through-fixation-of-carbon-dioxide-molecular-assembly-from-ln4-to-ln4-cluster-pairs
#18
Jianfeng Wu, Xiao-Lei Li, Lang Zhao, Mei Guo, Jinkui Tang
A series 1.Ln of tetranuclear lanthanide clusters [Ln4(μ4-O)L2(PhCOO)6]·solvent (Ln = Gd (1.Gd), Dy (1.Dy), Ho (1.Ho)) and octanuclear lanthanide Ln4 cluster pairs 2.Ln [Ln8(μ3-OH)4(CO3)2L4(PhCOO)8]·solvent (Ln = Gd (2.Gd), Dy (2.Dy), Tb (2.Tb)) were assembled by using a bi-Schiff-based ligand H2L and characterized structurally and magnetically. Interestingly, the octanuclear Ln4 cluster pairs 2.Ln are proposed to be assembled from the tetranuclear clusters 1.Ln through the uptake of CO2 from air in a more basic media...
March 14, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28283336/tissue-engineering-with-peripheral-blood-derived-mesenchymal-stem-cells-promotes-the-regeneration-of-injured-peripheral-nerves
#19
Mengjie Pan, Xianghai Wang, Yijing Chen, Shangtao Cao, Jinkun Wen, Guofeng Wu, Yuanyuan Li, Lixia Li, Changhui Qian, Zhenqi Qin, Zhenlin Li, Dandan Tan, Zhihao Fan, Wutian Wu, Jiasong Guo
Peripheral nerve injury repair can be enhanced by Schwann cell (SC) transplantation, but clinical applications are limited by the lack of a cell source. Thus, alternative systems for generating SCs are desired. Herein, we found the peripheral blood-derived mesenchymal stem cells (PBMSCs) could be induced into SC like cells with expressing SC-specific markers (S100, P75NTR and CNPase) and functional factors (NGF, NT-3, c-Fos, and Krox20). When the induced PBMSCs (iPBMSCs) were transplanted into crushed rat sciatic nerves, they functioned as SCs by wrapping the injured axons and expressing myelin specific marker of MBP...
March 7, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28282112/peptide-cross-linkers-immobilization-of-platinum-nanoparticles-highly-dispersed-on-graphene-oxide-nanosheets-with-enhanced-photocatalytic-activities
#20
Tsukasa Mizutaru, Galina Marzun, Sebastian Kohsakowski, Stephan Barcikowski, Dachao Hong, Hiroaki Kotani, Takahiko Kojima, Takahiro Kondo, Junji Nakamura, Yohei Yamamoto
For exerting potential catalytic and photocatalytic activities of metal nanoparticles (MNPs), immobilization of MNPs on a support medium in highly dispersed state is desired. In this Research Article, we demonstrated that surfactant-free platinum nanoparticles (PtNPs) were efficiently immobilized on graphene oxide (GO) nanosheets in a highly dispersed state by utilizing oligopeptide β-sheets as a cross-linker. The fluorenyl-substituted peptides were designed to form β-sheets, where metal-binding thiol groups and protonated and positively charged amino groups are integrated on the opposite sides of the surface of a β-sheet, which efficiently bridge PtNPs and GO nanosheet...
March 22, 2017: ACS Applied Materials & Interfaces
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