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https://www.readbyqxmd.com/read/27922204/encapsulation-of-bimetallic-metal-nanoparticles-into-robust-zr-based-metal-organic-frameworks-evaluation-of-the-catalytic-potential-for-size-selective-hydrogenation
#1
Christoph Rösler, Stefano Dissegna, Victor Lopez Rechac, Max Kauer, Penghu Guo, Stuart Turner, Kevin Ollegott, Hirokazu Kobayashi, Tomokazu Yamamoto, Daniel Peeters, Yuemin Wang, Syo Matsumura, Gustaaf Van Tendeloo, Hiroshi Kitagawa, Martin Muhler, Francesc X Llabrés I Xamena, Roland A Fischer
The realization of metal NPs with bimetallic character and distinct composition for specific catalytic applications is an intensively studied field. Due to the synergy between metals, most of the bimetallic particles exhibit unique properties, only hardly provided by the individual monometallic counterparts. However, as small sized NPs possess high surface energy, agglomeration during catalytic reactions is favored. Sufficient stabilization can be achieved by confinement of NPs in porous support materials. In this sense, especially MOFs gained a lot of attention during the last years, however, encapsulation of bimetallic species remains challenging...
December 6, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27922060/magnetic-properties-improvement-of-die-upset-nd-fe-b-magnets-by-dy-cu-press-injection-and-subsequent-heat-treatment
#2
Zexuan Wang, Jinyun Ju, Jinzhi Wang, Wenzong Yin, Renjie Chen, Ming Li, Chaoxiang Jin, Xu Tang, Don Lee, Aru Yan
Ultrafine-grained die-upset Nd-Fe-B magnets are of importance because they provide a wide researching space to redesign the textured structures. Here is presented a route to obtain a new die-upset magnet with substantially improved magnetic properties. After experiencing the optimized heat treatment, both the coercivity and remanent magnetization of the Dy-Cu press injected magnets increased substantially in comparison with those of the annealed reference magnets, which is distinct from the reported experimental results on heavy rare-earth diffusion...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27921292/cranial-joint-histology-in-the-mallard-duck-anas-platyrhynchos-new-insights-on-avian-cranial-kinesis
#3
Alida M Bailleul, Lawrence M Witmer, Casey M Holliday
The evolution of avian cranial kinesis is a phenomenon in part responsible for the remarkable diversity of avian feeding adaptations observable today. Although osteological, developmental and behavioral features of the feeding system are frequently studied, comparatively little is known about cranial joint skeletal tissue composition and morphology from a microscopic perspective. These data are key to understanding the developmental, biomechanical and evolutionary underpinnings of kinesis. Therefore, here we investigated joint microstructure in juvenile and adult mallard ducks (Anas platyrhynchos; Anseriformes)...
December 6, 2016: Journal of Anatomy
https://www.readbyqxmd.com/read/27921147/can-the-alendronate-dosage-be-altered-when-combined-with-high-frequency-loading-in-osteoporosis-treatment
#4
C B Correa, G V Camargos, M Chatterjee, M F Mesquita, A A Del Bel Cury, I Naert, J Duyck, K Vandamme
: Alendronate therapy has been associated with serious side effects. Altering the alendronate concentration and combining with high-frequency loading as mechanical intervention was explored in this animal study as a treatment for osteoporosis. The bone anabolic potency of high-frequency loading was overruled by the different alendronate dosages applied in the present study. Further exploration of reduced hormonal therapy associated with mechanical interventions in osteoporosis treatment should be sought...
December 5, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27920096/structural-pathways-supporting-swift-acquisition-of-new-visuomotor-skills
#5
Ari E Kahn, Marcelo G Mattar, Jean M Vettel, Nicholas F Wymbs, Scott T Grafton, Danielle S Bassett
Human skill learning requires fine-scale coordination of distributed networks of brain regions linked by white matter tracts to allow for effective information transmission. Yet how individual differences in these anatomical pathways may impact individual differences in learning remains far from understood. Here, we test the hypothesis that individual differences in structural organization of networks supporting task performance predict individual differences in the rate at which humans learn a visuomotor skill...
December 5, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27918827/optic-radiations-microstructural-changes-in-glaucoma-and-association-with-severity-a-study-using-3tesla-magnetic-resonance-diffusion-tensor-imaging
#6
Laury Tellouck, Muriel Durieux, Pierrick Coupé, Audrey Cougnard-Grégoire, Joy Tellouck, Thomas Tourdias, Fanny Munsch, Arnaud Garrigues, Catherine Helmer, Florence Malet, Jean-François Dartigues, Vincent Dousset, Cécile Delcourt, Cédric Schweitzer
Purpose: To compare microstructural changes along the optical radiations and brain structure volumes between glaucoma and control subjects using in vivo magnetic resonance imaging and to analyze their association with severity of the disease. Methods: A total of 50 open-angle glaucoma subjects and 50 healthy age- and sex-matched controls underwent detailed ophthalmologic examinations (including visual field testing [VF], funduscopy, and spectral-domain optical coherence tomography) as well as diffusion tensor imaging (DTI) using 3...
December 1, 2016: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/27918708/patient-specific-hip-fracture-strength-assessment-with-microstructural-mr-imaging-based-finite-element-modeling
#7
Chamith S Rajapakse, Alexandra Hotca, Benjamin T Newman, Austin Ramme, Shaleen Vira, Elizabeth A Kobe, Rhiannon Miller, Stephen Honig, Gregory Chang
Purpose To describe a nonlinear finite element analysis method by using magnetic resonance (MR) images for the assessment of the mechanical competence of the hip and to demonstrate the reproducibility of the tool. Materials and Methods This prospective study received institutional review board approval and fully complied with HIPAA regulations for patient data. Written informed consent was obtained from all subjects. A nonlinear finite element analysis method was developed to estimate mechanical parameters that relate to hip fracture resistance by using MR images...
December 2, 2016: Radiology
https://www.readbyqxmd.com/read/27918611/moisture-absorption-and-water-dynamics-in-the-powder-of-egg-albumen-peptide-met-pro-asp-ala-his-leu
#8
Shuailing Yang, Xuye Liu, Mingdi Zhang, Songyi Lin, Feng Chen
Moisture absorbed into the powder of Met-Pro-Asp-Ala-His-Leu (MPDAHL)-a novel egg albumen antioxidant peptide-profoundly affects its properties. In this study, we elucidated water dynamics in MPDAHL using DVS, DSC, and low-field (1) H NMR. Based on the DVS data, we found that MPDAHL sorption kinetics obey a parallel exponential model. DSC results indicated that both water and heating could change the microstructure of MPDAHL. The T2 parameters of NMR reflected the different phases of moisture absorption revealed that there were 4 categories of water with different states or mobility in the MPDAHL during the moisture absorption process...
December 5, 2016: Journal of Food Science
https://www.readbyqxmd.com/read/27918081/st1926-attenuates-steroid-induced-osteoporosis-in-rats-by-inhibiting-inflammation-response
#9
Hong-Xing Zhao, Yuan-Xia Huang, Jin-Gang Tao
Steroid, also known as glucocorticoid, induced osteonecrosis of the femoral head in young adults, which has been a challenging disorder for the frequent incidence of collapse of femoral head, leading to dysfunction of hip joint and impairing life quality of human. Bioavailable and less toxic synthetic retinoids, such as the atypical adamantyl retinoid ST1926, have been developed and investigated in clinical trials for many diseases. Serum lipid-related indicators were assessed to elucidate the role of ST1926 in regulating lipid metabolism...
December 5, 2016: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/27917415/evolution-of-solid-aqueous-interface-in-aqueous-sodium-ion-batteries
#10
Xiaowen Zhan, Mona Shirpour
The microstructural and compositional evolution at the solid/aqueous solution interfaces are investigated to monitor the electrical properties of superionic conducting phosphates and the electrochemical failure of aqueous sodium-ion batteries.
December 5, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27916933/femtosecond-laser-ablated-fbg-with-composite-microstructure-for-hydrogen-sensor-application
#11
Meng Zou, Yutang Dai, Xian Zhou, Ke Dong, Minghong Yang
A composite microstructure in fiber Bragg grating (FBG) with film deposition for hydrogen detection is presented. Through ablated to FBG cladding by a femtosecond laser, straight-trenches and spiral micro-pits are formed. A Pd-Ag film is sputtered on the surface of the laser processed FBG single mode fiber, and acts as hydrogen sensing transducer. The demonstrated experimental outcomes show that a composite structure produced the highest sensitivity of 26.3 pm/%H, nearly sevenfold more sensitive compared with original standard FBG...
December 1, 2016: Sensors
https://www.readbyqxmd.com/read/27915467/the-physics-of-pollinator-attraction
#12
REVIEW
Edwige Moyroud, Beverley J Glover
Contents 1 I. 1 II. 1 III. 3 IV. 4 V. 4 4 References 5 SUMMARY: This Tansley Insight focuses on recent advances in our understanding of how flowers manipulate physical forces to attract animal pollinators and ensure reproductive success. Research has traditionally explored the role of chemical pigments and volatile organic compounds as cues for pollinators, but recent reports have demonstrated the importance of physical and structural means of pollinator attraction. Here we explore the role of petal microstructure in influencing floral light capture and optics, analysing colour, gloss and polarization effects...
December 4, 2016: New Phytologist
https://www.readbyqxmd.com/read/27915097/effects-of-chronic-lead-exposure-on-bone-mineral-properties-in-femurs-of-growing-rats
#13
Pedro Álvarez-Lloret, Ching Ming Lee, María Inés Conti, Antonela Romina Terrizzi, Santiago González-López, María Pilar Martínez
Lead exposure has been associated with several defective skeletal growth processes and bone mineral alterations. The aim of the present study is to make a more detailed description of the toxic effects of lead intoxication on bone intrinsic material properties as mineral composition, morphology and microstructural characteristics. For this purpose, Wistar rats were exposed (n=12) to 1000ppm lead acetate in drinking water for 90days while control group (n=8) were treated with sodium acetate. Femurs were examined using inductively coupled plasma optical emission spectrometry (ICP-OES), Attenuated Total Reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), and micro-Computed Tomography (μCT)...
November 30, 2016: Toxicology
https://www.readbyqxmd.com/read/27915026/effects-of-model-definitions-and-parameter-values-in-finite-element-modeling-of-human-middle-ear-mechanics
#14
Daniel De Greef, Felipe Pires, Joris J J Dirckx
BACKGROUND: Despite continuing advances in finite element software, the realistic simulation of middle ear response under acoustic stimulation continues to be challenging. One reason for this is the wide range of possible choices that can be made during the definition of a model. Therefore, an explorative study of the relative influences of some of these choices is potentially very helpful. METHOD: Three finite element models of the human middle ear were constructed, based on high-resolution micro-computed tomography scans from three different human temporal bones...
November 30, 2016: Hearing Research
https://www.readbyqxmd.com/read/27914401/examining-the-effects-of-microstructure-on-geoacoustic-parameters-in-fine-grained-sediments
#15
Megan S Ballard, Kevin M Lee
This paper presents a set of controlled laboratory experiments designed to develop a basis for understanding the relationship between microscopic and macroscopic properties of fine-grained sediments. Two samples of kaolinite platelets were selected for this study, and effects of sediment microstructure on geoacoustic properties are deduced from a comparison of the measured properties. To provide additional interpretation of the acoustic measurements, compressional and shear wave properties are compared to predicted values from sediment-acoustic models...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27914376/mode-converted-ultrasonic-scattering-in-polycrystals-with-elongated-grains
#16
Andrea P Arguelles, Christopher M Kube, Ping Hu, Joseph A Turner
Elastic wave scattering is used to study polycrystalline media for a wide range of applications. Received signals, which include scattering from the randomly oriented grains comprising the polycrystal, contain information from which useful microstructural parameters may often be inferred. Recently, a mode-converted diffuse ultrasonic scattering model was developed for evaluating the scattered response of a transverse wave from an incident longitudinal wave in a polycrystalline medium containing equiaxed single-phase grains with cubic elastic symmetry...
September 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27913902/a-new-multiscale-micromechanical-model-of-vertebral-trabecular-bones
#17
Rami Haj-Ali, Eyass Massarwa, Jacob Aboudi, Fabio Galbusera, Uwe Wolfram, Hans-Joachim Wilke
A new three-dimensional (3D) multiscale micromechanical model has been suggested as adept at predicting the overall linear anisotropic mechanical properties of a vertebral trabecular bone (VTB) highly porous microstructure. A nested 3D modeling analysis framework spanning the multiscale nature of the VTB is presented herein. This hierarchical analysis framework employs the following micromechanical methods: the 3D parametric high-fidelity generalized method of cells (HFGMC) as well as the 3D sublaminate model...
December 2, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27913855/what-can-the-microstructure-of-stones-tell-us
#18
REVIEW
James C Williams, Elaine Worcester, James E Lingeman
How stones are retained within the kidney while small in size is still not fully understood. In this paper, we show two examples of how stones are retained during early growth: one is growth on Randall's (interstitial) plaque, and the other is growth on mineral that has formed as a luminal plug in a terminal collecting duct. These two mechanisms of stone retention during early growth have distinctive morphologic features that can be seen by methods that show the microscopic structure of the stones. Stones growing on Randall's plaque display an apatite region that is typically not large in size (<0...
December 2, 2016: Urolithiasis
https://www.readbyqxmd.com/read/27913627/aberrant-interhemispheric-homotopic-functional-and-structural-connectivity-in-amyotrophic-lateral-sclerosis
#19
Jiuquan Zhang, Bing Ji, Jun Hu, Chaoyang Zhou, Longchuan Li, Zhihao Li, Xuequan Huang, Xiaoping Hu
OBJECTIVE: Amyotrophic lateral sclerosis (ALS) is an idiopathic and fatal neurodegenerative disease of the human motor system. While microstructural alterations in corpus callosum (CC) have been identified as a consistent feature of ALS, studies directly examining interhemispheric neural connectivity are still lacking. To shed more light on the pathophysiology of ALS, the present study aims to examine alterations of interhemispheric structural and functional connectivity in individuals with ALS...
December 2, 2016: Journal of Neurology, Neurosurgery, and Psychiatry
https://www.readbyqxmd.com/read/27913387/using-multivariate-base-rates-to-interpret-low-scores-on-an-abbreviated-battery-of-the-delis-kaplan-executive-function-system
#20
Justin E Karr, Mauricio A Garcia-Barrera, James A Holdnack, Grant L Iverson
OBJECTIVE: Executive function consists of multiple cognitive processes that operate as an interactive system to produce volitional goal-oriented behavior, governed in large part by frontal microstructural and physiological networks. Identification of deficits in executive function in those with neurological or psychiatric conditions can be difficult because the normal variation in executive function test scores, in healthy adults when multiple tests are used, is largely unknown. This study addresses that gap in the literature by examining the prevalence of low scores on a brief battery of executive function tests...
December 1, 2016: Archives of Clinical Neuropsychology: the Official Journal of the National Academy of Neuropsychologists
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