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https://www.readbyqxmd.com/read/28319372/3d-printed-micrometre-scale-polymer-mounts-for-single-crystal-analysis
#1
Niall P Macdonald, Grace L Bunton, Ah Young Park, Michael C Breadmore, Nathan Laird Kilah
3D printed micrometre-scale polymer mounts for single crystal analysis have been prepared by photo polymerization using digital light projection stereolithography (DLP-SLA), with a commercially available digital light projection stereolithography printer (US$4000) and 3DM-ABS resin (US$150 per litre). The polymer mounts were prepared in batches of 49 in 1 hour 15 minutes, which allowed for rapid prototyping and testing of new crystal mounting designs, with a resin cost of 0.2¢ US per mount. The suitability of the 3D printed mounts for single crystal crystallography has been demonstrated through their use in Cu Kα X-ray diffraction experiments of Rochelle salt (sodium potassium tartrate), the protein lysozyme, and has been employed for routine crystallographic analysis of organic and inorganic materials...
March 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28318544/stereolithography-a-new-method-for-processing-dental-ceramics-by-additive-computer-aided-manufacturing
#2
Marion Dehurtevent, Lieven Robberecht, Jean-Christophe Hornez, Anthony Thuault, Etienne Deveaux, Pascal Béhin
OBJECTIVES: The aim of this study was to compare the physical and mechanical properties of stereolithography (SLA)- manufactured alumina ceramics of different composition to those of subtractive- manufactured ceramics and to produce suitable dental crown frameworks. METHODS: The physical and mechanical properties of a control and six experimental SLA ceramics prepared from slurries with small (S) and large (L) particles (0.46±0.03 and 1.56±0.04μm, respectively) and three dry matter contents (70%, 75%, 80%) were evaluated by dynamic rheometry, hydrostatic weighing, three3-point flexural strength measurements, and Weibull analyses, and by the micrometrics measurement of shrinkage ratio before and after the heat treatments...
March 16, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28303603/human-il-6-il-17-il-1%C3%AE-and-tnf-%C3%AE-differently-regulate-the-expression-of-pro-inflammatory-related-genes-tissue-factor-and-swine-leukocyte-antigen-class-i-in-porcine-aortic-endothelial-cells
#3
Hanchao Gao, Lu Liu, Yanli Zhao, Hidetaka Hara, Pengfei Chen, Jia Xu, Jia Tang, Ling Wei, Zesong Li, David K C Cooper, Zhiming Cai, Lisha Mou
BACKGROUND: Pro-inflammatory cytokines play important pathological effects in various diseases and allotransplantation; however, their pathological role in xenotransplantation remains elusive. In pig-to-human cell or organ transplantation, whether porcine cells or organs are activated by human cytokines or not as an important question needs to be investigated. METHODS: We investigated the effect of human IL-6, IFN-γ, IL-17, IL-1β, and TNF-α in xenotransplantation using several in vitro models and porcine aortic endothelial cells (PAECs) as target cells...
March 17, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28303183/contrasting-effects-of-plant-inter-and-intraspecific-variation-on-community-trait-responses-to-restoration-of-a-sandy-grassland-ecosystem
#4
Xiaoan Zuo, Xiyuan Yue, Peng Lv, Qiang Yu, Min Chen, Jing Zhang, Yongqing Luo, Shaokun Wang, Jing Zhang
Changes in plant community traits along an environmental gradient are caused by interspecific and intraspecific trait variation. However, little is known about the role of interspecific and intraspecific trait variation in plant community responses to the restoration of a sandy grassland ecosystem. We measured five functional traits of 34 species along a restoration gradient of sandy grassland (mobile dune, semi-fixed dune, fixed dune, and grassland) in Horqin Sand Land, northern China. We examined how community-level traits varied with habitat changes and soil gradients using both abundance-weighted and non-weighted averages of trait values...
February 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28301384/the-effects-of-hierarchical-micro-nano-structured-titanium-surface-on-osteoblast-proliferation-and-differentiation-under-diabetic-conditions
#5
Huanhuan Jiang, Xiang Ma, Wenjuan Zhou, Kai Dong, Xiaohui Rausch-Fan, Shutai Liu, Shu Li
PURPOSE: The aim of the present study was to mimic the hierarchical structure of bone tissues by simple sandblasting/acid-etching and anodization to investigate the effects of such surface characteristics on proliferation and differentiation of osteoblasts in high glucose concentrations. By the way, the effects of high glucose levels on osteoblast functions were tested. METHODS: MC3T3-E1 cells cultured on sand-blasted and acid-etched (SLA) surface and nano-modified SLA (NMSLA) surface were subjected to normal serum (NS) and diabetic serum (DS), respectively...
April 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28298724/variability-of-chlorophyll-a-concentration-in-the-gulf-of-guinea-and-its-relation-to-physical-oceanographic-variables
#6
Karen Nieto, Frédéric Mélin
The Gulf of Guinea represents a wide tract of the African coast with complex and rich coastal ecosystems undergoing various pressures. The seasonal variations of chlorophyll-a concentration (Chla) along the Gulf of Guinea (GoG) and their relations with physical oceanographic variables were analyzed using satellite observations covering the period 2002-2012. The effects of sea surface temperature (SST), sea level anomalies (SLA), winds, geostrophic currents, eddy kinetic energy (EKE), mesoscale eddies and fronts were considered on a monthly time scale...
February 2017: Progress in Oceanography
https://www.readbyqxmd.com/read/28298671/optimization-of-additive-content-and-their-combination-to-improve-the-quality-of-pure-barley-bread
#7
Milica Pojić, Tamara Dapčević Hadnađev, Miroslav Hadnađev, Slađana Rakita, Aleksandra Torbica
The objective of this study was to model the influence of pregelatinized OSA starch (OSA), wheat gluten (Gl) and xylanase (Xyl) on breadmaking potential of barley flour by using response surface methodology. Addition of these ingredients had significant effect on specific bread volume, crust and crumb lightness, crumb texture, average cell size and crumb density. OSA showed the most pronounced effect on specific bread volume, average cell size, crumb density and hardness. Interaction between OSA and Gl, as well as Gl and Xyl, respectively, increased and decreased the specific bread volume and crumb chewiness, while the interaction between OSA and Xyl decreased the specific volume decrease and increased crumb chewiness...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28296644/multiscale-porous-titanium-surfaces-via-a-two-step-etching-process-for-improved-mechanical-and-biological-performance
#8
Tae-Sik Jang, Hyun-Do Jung, Sungwon Kim, Byeong-Seok Moon, Jaeuk Baek, Cheonil Park, Juha Song, Hyoun-Ee Kim
Titanium (Ti)-based dental implants with multiscale surface topography have attracted great attention as a promising approach to enhance fixation and long-term stability of the implants, through the synergistic effect of nano- and microscale surface roughness, for accelerated bone regeneration and improved mechanical interlocking. However, structural integrity and mechanical stability of the multiscale roughened Ti surface under deformation need to be considered because significant deformation of dental implants is often induced during the surgical operation...
March 15, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28294500/geographical-variation-and-the-role-of-climate-in-leaf-traits-of-a-relic-tree-species-across-its-distribution-in-china
#9
Hongjie Meng, Xinzeng Wei, Scott B Franklin, Hao Wu, Mingxi Jiang
1.Intraspecific trait variation and trait-climate relationships are crucial for understanding a species' response to climate change. However, these phenomena have been rarely studied for tree species. Euptelea pleiospermum (E. pleiospermum) is a relic tree species with a wide distribution in China that offers a novel opportunity to examine such relationships. 2.Here, we measured 13 leaf traits of E. pleiospermum in 20 sites across its natural distribution in China. We investigated the extent of trait variation at local and regional scales, and developed geographic and climatic models to explain trait variation at the regional scale...
March 13, 2017: Plant Biology
https://www.readbyqxmd.com/read/28293748/assessing-trace-metal-contamination-and-organic-matter-in-the-brackish-lakes-as-the-major-source-of-potable-water
#10
Vlado Cuculić, Neven Cukrov, Željko Kwokal, Slađana Strmečki, Marta Plavšić
On small and medium karstic coastal islands in the Adriatic Sea, brackish lakes are often the only source of freshwater. Therefore, it is important to adequately evaluate the biogeochemical processes occurring in these complex water systems, as well as to determine the origin of contaminants present. In this study, the distribution and origin of trace metals (Tl, Hg, Cd, Pb, Cu, Zn, Ni, Co) and organic matter in the water column, sediment, and surrounding soil of the brackish lakes on Mljet Island, South Adriatic Sea, Croatia, were evaluated...
March 14, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/28291976/effects-of-a-group-psychoeducation-program-on-self-stigma-empowerment-and-perceived-discrimination-of-persons-with-schizophrenia
#11
Slađana Štrkalj Ivezić, Marijan Alfonso Sesar, Lana Mužinić
BACKGROUND: Self-stigma adversely affects recovery from schizophrenia. Analyses of self stigma reduction programs discovered that few studies have investigated the impact of education about the illness on self-stigma reduction. The objective of this study was to determine whether psychoeducation based on the principles of recovery and empowerment using therapeutic group factors assists in reduction of self-stigma, increased empowerment and reduced perception of discrimination in patients with schizophrenia...
March 2017: Psychiatria Danubina
https://www.readbyqxmd.com/read/28286037/surface-enrichment-with-hydroxyapatite-nanoparticles-in-stereolithography-fabricated-composite-polymer-scaffolds-promotes-bone-repair
#12
O Guillaume, M A Geven, C M Sprecher, V A Stadelmann, D W Grijpma, T T Tang, L Qin, Y Lai, M Alini, J D de Bruijn, H Yuan, R G Richards, D Eglin
Fabrication of composite scaffolds using stereolithography (SLA) for bone tissue engineering has shown great promises. However, in order to trigger effective bone formation and implant integration, exogenous growth factors are commonly combined to scaffold materials. In this study, we fabricated biodegradable composite scaffolds using SLA and endowed them with osteopromotive properties in the absence of biologics. First we prepared photo-crosslinkable poly(trimethylene carbonate) (PTMC) resins containing 20 and 40 wt...
March 7, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28283949/impact-of-chemical-organic-and-bio-fertilizers-application-on-bell-pepper-capsicum-annuum-l-and-biological-parameters-of-myzus-persicae-sulzer-hem-aphididae
#13
M Mardani-Talaee, J Razmjou, G Nouri-Ganbalani, M Hassanpour, B Naseri
Myzus persicae (Sulzer) is a polyphagous aphid that causes chlorosis, necrosis, stunting, and reduce growth rate of the host plants. In this research, the effects of Zinc sulfate and vermicompost (30%), Bacillus subtilis, Pseudomonas fluorescens, Glomus intraradices, G. intraradices × B. subtilis, and G. intraradices × P. fluorescens compared to control was investigated on the growth characters of Capsicum annuum L. and biological parameters of M. persicae. Different fertilizers caused a significant effect on growth characters of C...
March 11, 2017: Neotropical Entomology
https://www.readbyqxmd.com/read/28281349/comparing-microfluidic-performance-of-3d-printing-platforms
#14
Niall P Macdonald, Joan Marc Cabot, Petr Smejkal, Rosanne M Guijt, Brett Paull, Michael C Breadmore
Three dimensional printing (3D printing) has emerged as a potential revolutionary technology for the fabrication of mi-crofluidic devices. A direct experimental comparison of the three 3D printing technologies dominating microfluidics was conducted using a Y-junction microfluidic device; the design of which was optimized for each printer - fused deposition molding (FDM), Polyjet, and digital light processing stereolithography (DLP-SLA). Printer performance was evaluated in terms of feature size, accuracy, and suitability for mass manufacturing; laminar flow was studied to assess their suitabil-ity for microfluidics...
March 10, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28274121/dynamics-of-capillary-driven-flow-in-3d-printed-open-microchannels
#15
Robert K Lade, Erik J Hippchen, Christopher W Macosko, Lorraine F Francis
Microchannels have applications in microfluidic devices, patterns for micromolding, and even flexible electronic devices. Three-dimensional (3D) printing presents a promising alternative manufacturing route for these microchannels due to the technology's relative speed and the design freedom it affords its users. However, the roughness of 3D printed surfaces can significantly influence flow dynamics inside of a microchannel. In this work, open microchannels are fabricated using four different 3D printing techniques: fused deposition modeling (FDM), stereolithography (SLA), selective laser sintering, and multi jet modeling...
March 16, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28261115/il1r2-ccr2-and-cxcr4-may-form-heteroreceptor-complexes-with-nmdar-and-d2r-relevance-for-schizophrenia
#16
Dasiel O Borroto-Escuela, Alexander O Tarakanov, Karl Bechter, Kjell Fuxe
The mild neuroinflammation hypothesis of schizophrenia was introduced by Bechter in 2001. It has been hypothesized that a hypofunction of glutamatergic signaling via N-methyl-D-aspartate receptors (NMDARs) and hyperactivation of dopamine D2 receptors play a role in schizophrenia. The triplet puzzle theory states that sets of triplet amino acid homologies guide two different receptors toward each other and contributes to the formation of a receptor heteromer. It is, therefore, proposed that putative NMDAR-C-C chemokine receptor type 2 (CCR2), NMDAR-C-X-C chemokine receptor type 4 (CXCR4), and NMDAR- interleukin 1 receptor type II (IL1R2) heteromers can be formed in the neuronal networks in mild neuroinflammation due to demonstration of Gly-Leu-Leu (GLL), Val-Ser-Thr (VST), and/or Ser-Val-Ser (SVS) amino acid homologies between these receptor protomers...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28248021/-new-data-on-the-effectiveness-of-tadalafil-alone-and-in-combination-with-neyrodoz-in-treating-erectile-dysfunction-associated-with-secondary-premature-ejaculation
#17
N D Akhvlediani, I P Matyukhov
AIM: To compare the effectiveness of the phosphodiesterase type 5 inhibitor (PDE-5i) tadalafil alone and in combination with a biologically active dietary supplement (BADS) NeyroDoz, containing the precursors of serotonin in patients with erectile dysfunction (ED) associated with secondary premature ejaculation (SPE). MATERIAL AND METHODS: 105 patients (mean age 36.2+/-9.1 years) with concomitant ED and SPE were included in a prospective study and divided into 2 groups...
November 2016: Urologii︠a︡
https://www.readbyqxmd.com/read/28245937/does-energetic-cost-for-leaf-construction-in-sonneratia-change-after-introduce-to-another-mangrove-wetland-and-differ-from-native-mangrove-plants-in-south-china
#18
Feng-Lan Li, Lei Yang, Qi-Jie Zan, Paul-K S Shin, Siu-Gin Cheung, Yuk-Shan Wong, Nora Fung-Yee Tam, An-Ping Lei
Exotic species invasions are serious ecological problems. Leaf construction cost (CC) and growth traits of two Sonneratia (Sonneratia caseolaris and S. apetala) and four native species (Bruguiera gymnorrhiza, Kandelia obovata, Aegiceras corniculatum and Avicennia marina) in Hainan and Shenzhen mangrove wetlands were compared to evaluate invasive potentials of Sonneratia after introduced to Shenzhen, their new habitat. There were no significant differences in CC and growth traits between two wetlands, suggesting Sonneratia did not lose any advantage in the new habitat and were competitive in both wetlands...
February 25, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28244429/tin-x-o-y-coatings-facilitate-the-initial-adhesion-of-osteoblasts-to-create-a-suitable-environment-for-their-proliferation-and-the-recruitment-of-endothelial-cells
#19
M Moussa, O Banakh, B Wehrle-Haller, P Fontana, S Scherrer, M Cattani, A Wiskott, S Durual
Titanium-nitride-oxide coatings (TiN x O y ) improve osseointegration of endosseous implants. The exact mechanisms by which these effects are mediated are poorly understood except for an increase of osteoblast proliferation while a high degree of differentiation is maintained. One hypothesis holds that TiN x O y facilitates the initial spreading and adhesion of the osteoblasts. The aim of this work was to investigate the molecular mechanisms of osteoblast adhesion on TiN x O y as compared to microrough titanium SLA...
February 28, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28242061/patient-specific-in-vitro-models-for-hemodynamic-analysis-of-congenital-heart-disease-additive-manufacturing-approach
#20
Rafael Medero, Sylvana García-Rodríguez, Christopher J François, Alejandro Roldán-Alzate
Non-invasive hemodynamic assessment of total cavopulmonary connection (TCPC) is challenging due to the complex anatomy. Additive manufacturing (AM) is a suitable alternative for creating patient-specific in vitro models for flow measurements using four-dimensional (4D) Flow MRI. These in vitro systems have the potential to serve as validation for computational fluid dynamics (CFD), simulating different physiological conditions. This study investigated three different AM technologies, stereolithography (SLA), selective laser sintering (SLS) and fused deposition modeling (FDM), to determine differences in hemodynamics when measuring flow using 4D Flow MRI...
February 7, 2017: Journal of Biomechanics
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