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https://www.readbyqxmd.com/read/28222045/validation-of-scaffold-design-optimization-in-bone-tissue-engineering-finite-element-modeling-versus-designed-experiments
#1
Nicholas Uth, Jens Mueller, Byran Smucker, Azizeh-Mitra Yousefi
This study reports the development of biological/synthetic scaffolds for bone tissue engineering (TE) via 3D bioplotting. These scaffolds were composed of poly(L-lactic-co-glycolic acid) (PLGA), type I collagen, and nano-hydroxyapatite (nHA) in an attempt to mimic the extracellular matrix of bone. The solvent used for processing the scaffolds was 1,1,1,3,3,3-hexafluoro-2-propanol. The produced scaffolds were characterized by scanning electron microscopy, microcomputed tomography, thermogravimetric analysis, and unconfined compression test...
February 21, 2017: Biofabrication
https://www.readbyqxmd.com/read/28221934/effect-of-process-temperature-on-virus-inactivation-during-high-hydrostatic-pressure-processing-of-contaminated-fruit-puree-and-juice
#2
Hao Pan, Matthew Buenconsejo, Karl F Reineke, Y Carol Shieh
High pressure processing (HPP) can inactivate pathogens and retain fruit qualities. Elevated HPP pressure or time increases virus inactivation, but the effect of temperature is not consistently observed for norovirus and hepatitis A virus. In the present study, the effectiveness of HPP holding temperatures (<40°C) and pressures were evaluated for inactivating surrogates (murine norovirus [MNV] and MS2 coliphage) in pomegranate and strawberry juices and strawberry puree using a 24-liter HPP system. The holding temperature was established by setting the HPP initial temperature via pretrials...
September 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28221749/high-interlaminar-shear-strength-enhancement-of-carbon-fiber-epoxy-composite-through-fiber-and-matrix-anchored-carbon-nanotube-networks
#3
Yilei Wang, Suresh Kumar Raman Pillai, Jianfei Che, Mary B Chan-Park
To improve the interlaminar shear strength (ILSS) of carbon fiber reinforced epoxy composite, networks of multi-walled carbon nanotubes (MWNTs) were grown on micron-sized carbon fibers and single-walled carbon nanotubes (SWNTs) were dispersed into the epoxy matrix so that these two types of carbon nanotubes entangle at the carbon fiber (CF)/epoxy matrix interface. The MWNTs on the CF fiber (CF-MWNTs) were grown by chemical vapor deposition (CVD) while the single-walled carbon nanotubes (SWNTs) were finely dispersed in the epoxy matrix precursor with the aid of a dispersing agent -- polyimide-graft-bisphenol A diglyceryl acrylate (PI-BDA) copolymer...
February 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28220171/towards-highly-active-pd-ceo2-for-alkene-hydrogenation-by-tuning-pd-dispersion-and-surface-properties-of-the-catalysts
#4
Sai Zhang, Jing Li, Zhaoming Xia, Chao Wu, Zhiyun Zhang, Yuanyuan Ma, Yongquan Qu
Extensive applications of noble metals as heterogeneous catalysts are limited by their global reserve scarcity and exorbitant price. Identifying the intrinsic active nature of a catalyst benefits the designing of catalysts with trace amounts of noble metals; these catalysts display better or comparable overall catalytic efficiency than their heavily loaded counterparts. Herein, systematic studies on Pd dispersion and surface properties of a series of Pd/CeO2 catalysts for styrene hydrogenation showed that high Pd dispersion and surface abundant defects of the catalysts are essential to realize superior activity...
February 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28220128/effect-of-leaf-water-potential-on-internal-humidity-and-co2-dissolution-reverse-transpiration-and-improved-water-use-efficiency-under-negative-pressure
#5
Timo Vesala, Sanna Sevanto, Tiia Grönholm, Yann Salmon, Eero Nikinmaa, Pertti Hari, Teemu Hölttä
The pull of water from the soil to the leaves causes water in the transpiration stream to be under negative pressure decreasing the water potential below zero. The osmotic concentration also contributes to the decrease in leaf water potential but with much lesser extent. Thus, the surface tension force is approximately balanced by a force induced by negative water potential resulting in concavely curved water-air interfaces in leaves. The lowered water potential causes a reduction in the equilibrium water vapor pressure in internal (sub-stomatal/intercellular) cavities in relation to that over water with the potential of zero, i...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28220112/predominance-of-viable-spore-forming-piezophilic-bacteria-in-high-pressure-enrichment-cultures-from-1-5-to-2-4-km-deep-coal-bearing-sediments-below-the-ocean-floor
#6
Jiasong Fang, Chiaki Kato, Gabriella M Runko, Yuichi Nogi, Tomoyuki Hori, Jiangtao Li, Yuki Morono, Fumio Inagaki
Phylogenetically diverse microorganisms have been observed in marine subsurface sediments down to ~2.5 km below the seafloor (kmbsf). However, very little is known about the pressure-adapted and/or pressure-loving microorganisms, the so called piezophiles, in the deep subseafloor biosphere, despite that pressure directly affects microbial physiology, metabolism, and biogeochemical processes of carbon and other elements in situ. In this study, we studied taxonomic compositions of microbial communities in high-pressure incubated sediment, obtained during the Integrated Ocean Drilling Program (IODP) Expedition 337 off the Shimokita Peninsula, Japan...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28218731/a-single-use-in-vitro-biosensor-for-the-detection-of-t-tau-protein-a-biomarker-of-neuro-degenerative-disorders-in-pbs-and-human-serum-using-differential-pulse-voltammetry-dpv
#7
Yifan Dai, Alireza Molazemhosseini, Chung Chiun Liu
A single-use, in vitro biosensor for the detection of T-Tau protein in phosphate-buffer saline (PBS) and undiluted human serum was designed, manufactured, and tested. Differential pulse voltammetry (DPV) served as the transduction mechanism. This biosensor consisted of three electrodes: working, counter, and reference electrodes fabricated on a PET sheet. Both working and counter electrodes were thin gold film, 10 nm in thickness. Laser ablation technique was used to define the size and structure of the biosensor...
February 19, 2017: Biosensors
https://www.readbyqxmd.com/read/28216846/three-dimensional-finite-element-analysis-of-the-stress-distribution-pattern-in-a-mandibular-first-molar-tooth-restored-with-five-different-restorative-materials
#8
Kathleen Manuela D'souza, Meena Ajay Aras
INTRODUCTION: Badly broken or structurally compromised posterior teeth are frequently associated with crown/root fracture. Numerous restorative materials have been used to fabricate indirect full-coverage restorations for such teeth. This study aims to evaluate and compare the effect of restorative materials on the stress distribution pattern in a mandibular first molar tooth, under varying loading conditions and to compare the stress distribution pattern in five commonly used indirect restorative materials...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28214242/injury-and-recovery-of-escherichia-coli-atcc25922-cells-treated-by-high-hydrostatic-pressure-at-400-600%C3%A2-mpa
#9
Keitarou Kimura, Kazuya Morimatsu, Takashi Inaoka, Kazutaka Yamamoto
Escherichia coli cells were inactivated by high hydrostatic pressure (HHP) at 400-600 MPa and their recovery under various conditions was evaluated by colony counting and flow cytometer (FCM) analyses. The lag time in colony formation and an improved recovery of cells under less oxidative conditions (pyruvate addition to the medium and incubation in anaerobic conditions) were observed for HHP treated cells, which indicated that a significant portion of cells were injured and recovered during incubation after HHP treatment...
February 14, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28213030/high-hydrostatic-pressure-effects-on-listeria-monocytogenes-and-l-innocua-evidence-for-variability-in-inactivation-behaviour-and-in-resistance-to-pediocin-bacha-6111-2
#10
Carolina Bruschi, Norton Komora, Sónia Marília Castro, Jorge Saraiva, Vânia Borges Ferreira, Paula Teixeira
The effect of high hydrostatic pressure (HHP) on the survival of 14 strains of Listeria monocytogenes from food or clinical origins, selected to represent different pheno and genotypes, was evaluated. Stationary phase cells were submitted to 300, 400 and 500 MPa at 10 °C, for 5 min. A high variability in the resistance of L. monocytogenes to pressure was observed, and particularly two strains isolated from food were significantly more baroresistant than the rest. Strains of L. monocytogenes resistant to one or more antibiotics exhibited significantly higher levels of survival after the high pressure treatment at 400 MPa...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28211249/improving-the-interpretability-of-climate-landscape-metrics-an-ecological-risk-analysis-of-japan-s-marine-protected-areas
#11
Jorge García Molinos, Shintaro Takao, Naoki H Kumagai, Elvira S Poloczanska, Michael T Burrows, Masahiko Fujii, Hiroya Yamano
Conservation efforts strive to protect significant swaths of terrestrial, freshwater and marine ecosystems from a range of threats. As climate change becomes an increasing concern, these efforts must take into account how resilient protected spaces will be in the face of future drivers of change such as warming temperatures. Climate landscape metrics, which signal the spatial magnitude and direction of climate change, support a convenient initial assessment of potential threats to and opportunities within ecosystems to inform conservation and policy efforts where biological data are not available...
February 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28210433/effect-of-adhesive-layers-on-microshear-bond-strength-of-nanocomposite-resin-to-dentin
#12
Nayef H Felemban, Mohamed I Ebrahim
BACKGROUND: Bond strength of adhesive layer can absorb unwanted stresses of polymerization shrinkage in composite resin restorations; increased microshear bond strength can prevent failure of restoration materials, the purpose of this study was to evaluate the effect of adhesive layers on microshear bond strength of nanocomposite resin to dentin. MATERIAL AND METHODS: Two different types of adhesive systems: universal adhesive (ExciTE) and newly developed adhesive (Nano-Bond), and one type of light-cured resin restorative material (Nanocomposite resin) were used in this study...
February 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28207232/oxidant-induced-high-efficient-mussel-inspired-modification-on-pvdf-membrane-with-superhydrophilicity-and-underwater-superoleophobicity-characteristics-for-oil-water-separation
#13
Chongdan Luo, Qingxia Liu
In this work, a facile one-step approach was developed to modify hydrophobic polyvinylidene fluoride (PVDF) microfiltration membrane with superhydrophilicity and underwater superoleophobicity properties via a high-efficient deposition of polydopamine (PDA) coating oxidized by sodium periodate in a slightly acidic environment (pH = 5.0). In contrast to the traditional PDA coating on hydrophobic membranes autoxidized by O2 in a weak basic buffer solution, the superhydrophilicity and ultra-high pure water permeability (about 11934 L m-2 h-1 under 0...
February 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28207172/drivers-of-redistribution-of-fishing-and-non-fishing-effort-after-the-implementation-of-a-marine-protected-area-network
#14
Reniel B Cabral, Steven D Gaines, Brett A Johnson, Tom W Bell, Crow White
Marine spatial planning (MSP) is increasingly utilized to sustainably manage ocean uses. Marine protected areas (MPAs), a form of spatial management in which parts of the ocean are regulated to fishing, are now a common tool in MSP for conserving marine biodiversity and managing fisheries. However, the use of MPAs in MSP often neglects, or simplifies, the redistribution of fishing and non-fishing activities inside and outside of MPAs following their implementation. This redistribution of effort can have important implications for effective MSP...
October 3, 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28206901/assessment-of-enamel-bond-strength-of-hypoplastic-primary-teeth
#15
Lisa Scheidt, Mariane Emi Sanabe, Fabrãcio Mezzomo Collares, Vicente Castelo Branco Leitune, Eduardo Bresciani, Michele Baffi Diniz
PURPOSE: The purpose of this study was to compare the enamel bond strength of hypoplastic and healthy primary teeth. METHODS: Twenty-five hypoplastic teeth (experimental group) and 25 healthy primary teeth (control group) were selected and conditioned with 35 percent orthophosphoric acid before a two-layer adhesive system (Single Bond) was applied. Composite resin (Filtek Z350) was inserted in a single application, two-mm high and one-mm in diameter, and then light-cured for 20 seconds...
October 15, 2016: Pediatric Dentistry
https://www.readbyqxmd.com/read/28205637/optimization-of-buckypaper-enhanced-multifunctional-thermoplastic-composites
#16
Zhongrui Li, Zhiyong Liang
A series of flattened-nanotube reinforced thermoplastic composites are sizably fabricated as a function of buckypaper loading. The effects of the volume fraction, nanotube alignment and length on the tensile performance of the composites are factored into a general expression. The incorporation of self-reinforcing polyphenylene resin (Parmax) into a highly aligned buckypaper frame at an optimal weight ratio boosts the tensile strength and Young's modulus of the buckypaper/Parmax composite to 1145 MPa and 150 GPa, respectively, far exceeding those of Parmax and aligned buckypaper individually...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205247/a-novel-freeze-dried-storage-and-preparation-method-for-the-determination-of-mycophenolic-acid-in-plasma-by-high-performance-liquid-chromatography
#17
Lei Wang, Wei Qiang, Ying Li, Zeneng Cheng, Mengmeng Xie
Plasma samples were conventionally stored at freezing conditions until the time of detection. Such a technique, when carried out over an extended period, is energy-consuming, in addition, preparation and transportation of stored samples is inconvenient. In this study, a freeze-dried storage and preparation method was proposed to determine the presence of mycophenolic acid (MPA) in plasma. Fresh plasma samples were freeze-dried using a device, and then stored at ambient temperature. After the stored samples were soaked with methanol spiked with the internal standard, high-performance liquid chromatography was conducted to detect MPA...
February 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28203014/-influence-of-surface-treatment-with-sodium-hypochlorite-solution-on-dentin-bond-strength
#18
Y Wang, Y H Liang
OBJECTIVE: To evaluate the influence of sodium hypochlorite (NaOCl) solution used during root canal therapy on dentin bond strength. METHODS: In the study, 15 freshly extracted human third molars with complete dental crowns, caries and filling-free were selected. The occlusal enamel was removed perpendicular to the long axis of the tooth to expose middle flat surfaces of sound dentin. The occlusal dentin surfaces were then polished using 600-grit silicon papers for 1 min and rinsed with deionized water for 1 min...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203013/-curing-mode-of-universal-adhesives-affects-the-bond-strength-of-resin-cements-to-dentin
#19
Z R Fu, F C Tian, L Zhang, B Han, X Y Wang
OBJECTIVE: To determine the effects of curing mode of one-step and two-step universal adhesives on the micro-tensile bond strength (μTBS) of different dual-cure resin cements to dentin. METHODS: One-step universal adhesive Single Bond Universal (SBU), and two-step universal adhesive OptiBond Versa (VSA) were chosen as the subjects, one-step self-etching adhesive OptiBond All in One (AIO) and two-step self-etching adhesive Clearfil SE Bond (SEB) were control groups, and two dual-cure resin cements RelyX Ultimate (RLX) and Nexus 3 Universal (NX3) were used in this study...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28203012/-effects-of-saliva-contamination-on-bond-strength-of-resin-resin-interfaces
#20
H J Guo, C Z Gao, F Lin, W Liu, L Yue
OBJECTIVE: To estimate the bond strength between different resin composite interfaces, and to evaluate the effect of saliva contamination and management with the contamination on the bond strength. METHODS: Two commercial resin composites containing different types of fillers (AP-X: barium-glass; P60: quartz) were tested in this study. The basic composite blocks were made of AP-X. After wet-ground flatted, the experimental groups were divided into three groups according to the surface treatment: (1)Direct bonding group: the bonding surface was rinsed with distilled water for 20 s, then dried with oil-free air for 20 s; (2)Saliva contamination group: the bonding surface was bathed in saliva for 30 min, then distilled water was rinsed for 20 s and dried with oil-free air for 20 s; (3)Saliva contamination and 75% ethanol wiping group: bonding surface bathed in saliva for 30 min, then wipe the surface with 75% ethanol, distilled water rinse for 20 s and dry with oil-free air for 20 s; The control group was made of the basic composite bulks of AP-X directly bonding with composite P60...
February 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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