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https://www.readbyqxmd.com/read/28548293/local-photocurrent-mapping-and-cell-performance-behaviour-on-a-nanometre-scale-for-monolithically-interconnected-cu-in-ga-se2-solar-cells
#1
M Haggui, B Reinhold, P Andrae, D Greiner, M Schmid, P Fumagalli
The local efficiency of lamellar shaped Cu(In,Ga)Se2 solar cells has been investigated using scanning near-field optical microscopy (SNOM). Topographic and photocurrent measurements have been performed simultaneously with a 100 nm tip aperture. The lamellar shaped solar cell with monolithic interconnects (P scribe) has been investigated on a nanometre scale for the first time at different regions using SNOM. It was found that, the cell region between P1 and P2 significantly contributes to the solar cells overall photocurrent generation...
May 26, 2017: Journal of Microscopy
https://www.readbyqxmd.com/read/28547185/prognostic-value-of-eeg-microstates-in-acute-stroke
#2
Filippo Zappasodi, Pierpaolo Croce, Alessandro Giordani, Giovanni Assenza, Nadia M Giannantoni, Paolo Profice, Giuseppe Granata, Paolo M Rossini, Franca Tecchio
Given the importance of neuronal plasticity in recovery from a stroke and the huge variability of recovery abilities in patients, we investigated neuronal activity in the acute phase to enhance information about the prognosis of recovery in the stabilized phase. We investigated the microstates in 47 patients who suffered a first-ever mono-lesional ischemic stroke in the middle cerebral artery territory and in 20 healthy control volunteers. Electroencephalographic (EEG) activity at rest with eyes closed was acquired between 2 and 10 days (T0) after ischemic attack...
May 25, 2017: Brain Topography
https://www.readbyqxmd.com/read/28546952/time-dependency-of-morphological-remodeling-of-endothelial-cells-in-response-to-substrate-stiffness
#3
Zahra Goli-Malekabadi, Mohammad Tafazzoli-Shadpour, Ali Tamayol, Ehsan Seyedjafari
Introduction: Substrate stiffness regulates cellular behavior as cells experience different stiffness values of tissues in the body. For example, endothelial cells (ECs) covering the inner layer of blood vessels are exposed to different stiffness values due to various pathologic and physiologic conditions. Despite numerous studies, cells by time span sense mechanical properties of the substrate, but the response is not well understood. We hypothesized that time is a major determinant influencing the behavior of cells seeded on substrates of varying stiffness...
2017: BioImpacts: BI
https://www.readbyqxmd.com/read/28546926/iontophoresis-assisted-corneal-crosslinking-using-0-1-riboflavin-for-progressive-keratoconus
#4
Hong-Zhen Jia, Xu Pang, Zheng-Jun Fan, Na Li, Gang Li, Xiu-Jun Peng
AIM: To report the clinical results of iontophoresis-assisted epithelium-on corneal crosslinking (I-CXL) using 0.1% riboflavin in distilled water for progressive keratoconus. METHODS: In this prospective clinical study, we examined 94 eyes of 75 patients with progressive keratoconus who were treated with I-CXL using 0.1% riboflavin in distilled water. Best correct visual acuity (BCVA), Scheimpflug tomography, corneal topography, anterior segment optical coherence tomography, intraocular pressure, and endothelial cell density were evaluated at baseline and 1, 3, 6, 12, and 24mo after I-CXL...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28545847/sources-and-behaviour-of-nitrogen-compounds-in-the-shallow-groundwater-of-agricultural-areas-poyang-lake-basin-china
#5
Evgeniya Soldatova, Natalia Guseva, Zhanxue Sun, Valeriy Bychinsky, Pascal Boeckx, Bai Gao
Nitrogen contamination of natural water is a typical problem for various territories throughout the world. One of the regions exposed to nitrogen pollution is located in the Poyang Lake basin. As a result of agricultural activity and dense population, the shallow groundwater of this area is characterised by a high concentration of nitrogen compounds, primarily NO3(-), with the concentration varying from 0.1mg/L to 206mg/L. Locally, high ammonium content occurs in the shallow groundwater with low reduction potential Eh (<100mV)...
May 17, 2017: Journal of Contaminant Hydrology
https://www.readbyqxmd.com/read/28545414/the-observation-during-small-incision-lenticule-extraction-for-myopia-with-corneal-opacity
#6
Shaowei Zhang, Haipeng Xu, Ke Zheng, Jing Zhao, Weijun Jian, Meiyan Li, Xingtao Zhou
BACKGROUND: To evaluate the feasibility and efficacy of small incision lenticule extraction (SMILE) in the treatment of myopia with corneal opacity. METHODS: To evaluate the treatment of myopia with corneal opacity, 9 patients (4 males, 5 females) who underwent SMILE were enrolled in this prospective clinical study. One eye of each patient was treated. The results of laser scanning and lenticule extraction were observed during the surgery, and the surgical videos were again reviewed after surgery...
May 25, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28545236/thermal-characterization-of-dynamic-silicon-cantilever-array-sensors-by-digital-holographic-microscopy
#7
Marjan Zakerin, Antonin Novak, Masaya Toda, Yves Emery, Filipe Natalio, Hans-Jürgen Butt, Rüdiger Berger
In this paper, we apply a digital holographic microscope (DHM) in conjunction with stroboscopic acquisition synchronization. Here, the temperature-dependent decrease of the first resonance frequency (S₁(T)) and Young's elastic modulus (E₁(T)) of silicon micromechanical cantilever sensors (MCSs) are measured. To perform these measurements, the MCSs are uniformly heated from T₀ = 298 K to T = 450 K while being externally actuated with a piezo-actuator in a certain frequency range close to their first resonance frequencies...
May 23, 2017: Sensors
https://www.readbyqxmd.com/read/28544256/intrinsic-functional-connectivity-alterations-in-progressive-supranuclear-palsy-differential-effects-in-frontal-cortex-motor-and-midbrain-networks
#8
Johannes Rosskopf, Martin Gorges, Hans-Peter Müller, Dorothée Lulé, Ingo Uttner, Albert C Ludolph, Elmar Pinkhardt, Freimut D Juengling, Jan Kassubek
BACKGROUND: The topography of functional network changes in progressive supranuclear palsy can be mapped by intrinsic functional connectivity MRI. The objective of this study was to study functional connectivity and its clinical and behavioral correlates in dedicated networks comprising the cognition-related default mode and the motor and midbrain functional networks in patients with PSP. METHODS: Whole-brain-based "resting-state" functional MRI and high-resolution T1-weighted magnetic resonance imaging data together with neuropsychological and video-oculographic data from 34 PSP patients (22 with Richardson subtype and 12 with parkinsonian subtype) and 35 matched healthy controls were subjected to network-based functional connectivity and voxel-based morphometry analysis...
May 22, 2017: Movement Disorders: Official Journal of the Movement Disorder Society
https://www.readbyqxmd.com/read/28544141/assessing-the-pre-and-postpeak-phases-in-a-swallow-using-esophageal-pressure-topography
#9
Y Xiao, D A Carlson, Z Lin, N Rinella, D Sifrim, J E Pandolfino
BACKGROUND: The current paradigm of measuring esophageal contractile vigor assesses the entirety of a pressure wave using a single measurement, the distal contractile integral (DCI). We hypothesize that an assessment identifying separate phases of the contractile pressure wave before and after the pressure peak may help distinguish abnormalities in patients presenting with chest pain and dysphagia. The aim of the present study was to develop a technique to assess the individual phases and report on the values in healthy controls...
May 22, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28542409/voting-contagion-modeling-and-analysis-of-a-century-of-u-s-presidential-elections
#10
Dan Braha, Marcus A M de Aguiar
Social influence plays an important role in human behavior and decisions. Sources of influence can be divided as external, which are independent of social context, or as originating from peers, such as family and friends. An important question is how to disentangle the social contagion by peers from external influences. While a variety of experimental and observational studies provided insight into this problem, identifying the extent of contagion based on large-scale observational data with an unknown network structure remains largely unexplored...
2017: PloS One
https://www.readbyqxmd.com/read/28540578/-complications-and-postoperative-therapeutic-strategies-in-cross-linking
#11
REVIEW
M Kohlhaas
CLINICAL ISSUE: The reduced corneal mechanical stability in keratoconus and similar collagen diseases can lead to a progressive and irregular corneal shape and decrease of visual acuity. DIAGNOSTICS: A progression of keratectatic diseases can be shown with corneal topography. TREATMENT: Keratoconus can be treated by photo-oxidative cross-linking of the corneal collagen. In order to achieve a high absorption of irradiation energy in the cornea, riboflavin at a concentration of 0...
May 24, 2017: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
https://www.readbyqxmd.com/read/28540006/office-based-relaxing-incision-procedure-for-correction-of-astigmatism-after-deep-anterior-lamellar-keratoplasty
#12
Mohammad Ali Javadi, Sepehr Feizi, Firooz Mirbabaee, Yousef Fekri
PURPOSE: To report the outcomes of a simple and effective office-based procedure for the correction of astigmatism after deep anterior lamellar keratoplasty (DALK). METHODS: This study enrolled 24 consecutive keratoconic eyes that developed an intolerable amount of graft astigmatism after DALK. The location and extension of steep semi-meridians were determined using corneal topography. Office-based relaxing incision procedures were performed at the slit-lamp biomicroscope using a 27-gauge needle...
April 2017: Journal of Ophthalmic & Vision Research
https://www.readbyqxmd.com/read/28539605/coupling-mechanism-between-wear-and-oxidation-processes-of-304-stainless-steel-in-hydrogen-peroxide-environments
#13
Conglin Dong, Chengqing Yuan, Xiuqin Bai, Jian Li, Honglin Qin, Xinping Yan
Stainless steel is widely used in strongly oxidizing hydrogen peroxide (H2O2) environments. It is crucial to study its wear behaviour and failure mode. The tribological properties and oxidation of 304 stainless steel were investigated using a MMW-1 tribo-tester with a three-electrode setup in H2O2 solutions with different concentrations. Corrosion current densities (CCDs), coefficients of frictions (COFs), wear mass losses, wear surface topographies, and metal oxide films were analysed and compared. The results show that the wear process and oxidation process interacted significantly with each other...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539522/maintaining-mimicry-diversity-optimal-warning-colour-patterns-differ-among-microhabitats-in-amazonian-clearwing-butterflies
#14
Keith R Willmott, Julia C Robinson Willmott, Marianne Elias, Chris D Jiggins
Mimicry is one of the best-studied examples of adaptation, and recent studies have provided new insights into the role of mimicry in speciation and diversification. Classical Müllerian mimicry theory predicts convergence in warning signal among protected species, yet tropical butterflies are exuberantly diverse in warning colour patterns, even within communities. We tested the hypothesis that microhabitat partitioning in aposematic butterflies and insectivorous birds can lead to selection for different colour patterns in different microhabitats and thus help maintain mimicry diversity...
May 31, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28538858/-orthopathy-in-19th-century-peru-sebasti%C3%A3-n-lorente-and-the-catechism-of-hygiene
#15
Oswaldo Salaverry
Orthopathy appeared in Peru in the 19th century in various guises and different spheres that transcended the activities of doctors. Sebastián Lorente, a doctor and educator, promoted hygiene education for schoolchildren through the publication of a Catechism of Hygiene, which went through multiple editions in the second half of the century. The structure and content of the Catechism is linked to European medical traditions such as the miasmatic interpretation of diseases, but also to local traditions like the medical topography of Hipólito Unanue, both of which had a vision of imposing "healthy" behaviors on the population, which assimilated the work of Johann Peter Frank...
January 2017: Revista Peruana de Medicina Experimental y Salud Pública
https://www.readbyqxmd.com/read/28537074/polylactic-acid-nanofibers-scaffold-decorated-with-chitosan-island-like-topography-for-bone-tissue-engineering
#16
Ting Xu, Hongyang Yang, Dongzhi Yang, Zhong-Zhen Yu
In this work, a bicomponent scaffold with a core-shell and island-like structure that combines the respective advantages of polylactic acid (PLA) and chitosan (CS) was prepared via electrospinning accmopanied by an automatic phase separation and crystallization. The aim of this study was to introduce nanosized topography, and the high bioactivity of chitosan onto PLA nanofibers to enhance the cell biocompatibility of PLA scaffolds. The morphology, inner structure, surface composition, crystallinity, and thermodynamic analysis of nanofibers with various PLA/CS ratios were respectively characterized, and the formation mechanism of a core-shell or island-like topography structure was also speculated...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28535442/mining-for-osteogenic-surface-topographies-in-silico-design-to-in%C3%A2-vivo-osseo-integration
#17
Frits F B Hulshof, Bernke Papenburg, Aliaksei Vasilevich, Marc Hulsman, Yiping Zhao, Marloes Levers, Natalie Fekete, Meint de Boer, Huipin Yuan, Shantanu Singh, Nick Beijer, Mark-Anthony Bray, David J Logan, Marcel Reinders, Anne E Carpenter, Clemens van Blitterswijk, Dimitrios Stamatialis, Jan de Boer
Stem cells respond to the physicochemical parameters of the substrate on which they grow. Quantitative material activity relationships - the relationships between substrate parameters and the phenotypes they induce - have so far poorly predicted the success of bioactive implant surfaces. In this report, we screened a library of randomly selected designed surface topographies for those inducing osteogenic differentiation of bone marrow-derived mesenchymal stem cells. Cell shape features, surface design parameters, and osteogenic marker expression were strongly correlated in vitro...
May 12, 2017: Biomaterials
https://www.readbyqxmd.com/read/28535145/substrate-curvature-regulates-cell-migration
#18
Xiuxiu He, Yi Jiang
Cell migration is essential in many aspects of biology. Many basic migration processes, including adhesion, membrane protrusion and tension, cytoskeletal polymerization, and contraction, have to act in concert to regulate cell migration. At the same time, substrate topography modulates these processes. In this work, we study how substrate curvature at micrometer scale regulates cell motility. We have developed a 3D mechanical model of single cell migration and simulated migration on curved substrates with different curvatures...
May 23, 2017: Physical Biology
https://www.readbyqxmd.com/read/28534231/comparison-of-outcomes-and-complications-of-deep-anterior-lamellar-keratoplasty-and-penetrating-keratoplasty-performed-in-a-large-group-of-patients-with-keratoconus
#19
Ashbala Khattak, Fouad R Nakhli, Khaled M Al-Arfaj, Abdullah A Cheema
PURPOSE: To compare visual acuity, refraction, topography, and complications of deep anterior lamellar keratoplasty (DALK) and penetrating keratoplasty (PKP) performed in patients with keratoconus (KCN). METHODS: In this retrospective interventional non-randomized clinical study, patients with moderate to severe KCN that underwent either PKP or DALK for optical corrections were enrolled. The final outcome analysis was performed after complete suture removal for both groups of patients...
May 22, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28533968/changes-in-the-spatial-and-temporal-pattern-of-natural-forest-cover-on-hainan-island-from-the-1950s-to-the-2010s-implications-for-natural-forest-conservation-and-management
#20
Siliang Lin, Yaozhu Jiang, Jiekun He, Guangzhi Ma, Yang Xu, Haisheng Jiang
The study of the past, present, and future state and dynamics of the tropical natural forest cover (NFC) might help to better understand the pattern of deforestation and fragmentation as well as the influence of social and natural processes. The obtained information will support the development of effective conservation policies and strategies. In the present study, we used historical data of the road network, topography, and climatic productivity to reconstruct NFC maps of Hainan Island, China, from the 1950s to the 2010s, using the random forest algorithm...
2017: PeerJ
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