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Karl Zipser
To view brain activity in register with visual stimuli, a technique here referred to as "retinotopic projection," which translates functional measurements into retinotopic space, is employed. Retinotopic projection is here first applied to a previously acquired fMRI dataset in which a large set of grayscale photos of real scenes were presented to three subjects. A simple model of local contrast integration accounts for much of the data in early visual areas (V1 and V2). However, consistent discrepancies were discovered: Human faces tend to evoke stronger responses relative to other scene elements than predicted by the model, whereas periodic patterns evoke weaker responses than predicted by the model...
June 1, 2017: Journal of Vision
Sajjad Hussain, Juliana R Steter, Saima Gul, Artur J Motheo
This study examined the photo-assisted electrochemical degradation and mineralization of the antibiotic contaminant sulfamethoxazole (SMX). All the experiments were perform using a flow electrolytic cell, in which the influence of the current density (10-60 mA cm(-2)) and sodium chloride (0.02-0.10 mol L(-1)) in the supporting electrolyte composition was analyzed. The results showed that the total SMX and 50% TOC removal was achieved in the current density range used. As expected, the degradation kinetics presented a pseudo first order behavior and the rate constant increased from 0...
June 24, 2017: Journal of Environmental Management
Kichul Cho, Li Wencheng, Satoshi Takeshita, Jung-Kil Seo, Young-Ho Chung, Daekyung Kim, Tatsuya Oda
Heterocapsa circularisquama, a harmful dinoflagellate, has multiple haemolytic toxins that are considered to be involved in the toxic mechanism against shellfish and certain species of zooplankton. To evaluate the further nature of the toxins of H. circularisquama, we investigated its effects on several species of bacteria. By colony formation assay, we found that H. circularisquama had antibacterial activity toward the marine bacterium Vibrio alginolyticus in a cell density-dependent manner. When the inoculated bacterial cells were co-cultured with H...
June 19, 2017: Aquatic Toxicology
Wei Zhang, Xulu Zeng, Xiaojun Su, Xianshao Zou, Pierre-Adrien Mante, Magnus T Borgström, Arkady Yartsev
Understanding of recombination and photoconductivity dynamics of photo-generated charge carriers in GaxIn1-xP NWs is essential for their optoelectronic applications. In this paper, we have studied a series of GaxIn1-xP NWs with varied Ga composition. Time resolved photo-induced luminescence, femtosecond transient absorption and time resolved THz transmission measurements were performed to assess radiative and non-radiative recombination and photoconductivity dynamics of photo-generated charges in the NWs. We conclude that radiative recombination dynamics is limited by hole trapping whereas electrons are highly mobile until they recombine non-radiatively...
June 27, 2017: Nano Letters
Shiva Mohajernia, Seyedsina Hejazi, Anca Mazare, Nhat Truong Nguyen, Patrik Schmuki
In the present work we report on the key factors dictating the photo-electrochemical (PEC) performance of suboxide titania (TiOx) nanotubes. TiOx nanotubes were produced by a systematic variation of reduction heat treatments of TiO2 in Ar/H2. The properties of the TiOx tubes were investigated by electron paramagnetic resonance (EPR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), solid-state conductivity, reflectivity measurements, photocurrent spectroscopy, and photoelectrochemical hydrogen evolution...
June 27, 2017: Chemistry: a European Journal
Giuseppe Luongo, Filippo Giubileo, Luca Genovese, Laura Iemmo, Nadia Martucciello, Antonio Di Bartolomeo
We study the effect of temperature and light on the I-V and C-V characteristics of a graphene/silicon Schottky diode. The device exhibits a reverse-bias photocurrent exceeding the forward current and achieves a photoresponsivity as high as 2.5 A / W . We show that the enhanced photocurrent is due to photo-generated carriers injected in the graphene/Si junction from the parasitic graphene/SiO₂/Si capacitor connected in parallel to the diode. The same mechanism can occur with thermally generated carriers, which contribute to the high leakage current often observed in graphene/Si junctions...
June 27, 2017: Nanomaterials
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Netherlands Journal of Medicine
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Netherlands Journal of Medicine
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Netherlands Journal of Medicine
(no author information available yet)
No abstract text is available yet for this article.
June 2017: Netherlands Journal of Medicine
Lynn Stothers, Andrew Macnab
INTRODUCTION: In high-resource countries, modern treatments for urological diseases have led to significant reductions in mortality and morbidity; however, the benefits of modern treatment have yet to reach the majority of people worldwide. As attention is focused on improving urological care in the global community, policy and implementation research (PIR) offers a platform for effective organization and engagement. METHODS: We have compiled a photo essay to illustrate the fundamental components of PIR...
June 2017: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
Benxia Li, Liangzhi Shao, Baoshan Zhang, Renshan Wang, Mei Zhu, Xiaowei Gu
Investigating the dependence of the catalysis on the size and structure of materials is of great significance for exploiting catalysts with characteristics of high activity, low cost, and new property. Non-precious metal catalysts bear high hope to meet the increasing demands of industrial applications in a cost-effective and environmentally friendly way. In this work, we take size-controlled BiOCl nanosheets as examples, which are synthesized via a hydrothermal method by changing the reaction conditions. The BiOCl nanosheets were characterized in details to understand their size-property relationships, and were found to exhibit a series of thickness-dependent physicochemical properties, including specific surface area, light absorption, and the separation efficiency of photo-generated charge carriers...
June 20, 2017: Journal of Colloid and Interface Science
Alixandra Barasch, Kristin Diehl, Jackie Silverman, Gal Zauberman
How does volitional photo taking affect unaided memory for visual and auditory aspects of experiences? Across one field and three lab studies, we found that, even without revisiting any photos, participants who could freely take photographs during an experience recognized more of what they saw and less of what they heard, compared with those who could not take any photographs. Further, merely taking mental photos had similar effects on memory. These results provide support for the idea that photo taking induces a shift in attention toward visual aspects and away from auditory aspects of an experience...
June 1, 2017: Psychological Science
Kai Wang, Shikha Garg, T David Waite
The photochemical properties of the organic exudate secreted by a toxic strain of Microcystis aeruginosa were studied by measuring reactive oxygen species (ROS) generation and redox transformations of iron in the presence of the organic exudate under acidic (pH 4) and alkaline (pH 8) conditions. Our results show that the organic exudate generates nanomolar concentrations of superoxide and hydrogen peroxide on irradiation with simulated sunlight in a manner consistent with that reported for terrigenous natural organic matter...
June 26, 2017: Environmental Science & Technology
Elaine F Martin
Early vision care is critical for all children. If undetected, eye disorders such as amblyopia and strabismus may result in permanent vision loss. Vision exams should include a careful history and physical including fix and follow, red reflex, and cover/uncover testing. Photo screening and visual acuity exams should be administered whenever possible.
June 22, 2017: Nurse Practitioner
Alessandro Dani, Karoline Täuber, Weiyi Zhang, Helmut Schlaad, Jiayin Yuan
Porous polyelectrolyte membranes stable in a highly ionic environment are obtained by covalent crosslinking of an imidazolium-based poly(ionic liquid). The crosslinking reaction involves the UV light-induced thiol-ene (click) chemistry, and the phase separation, occurring during the crosslinking step, generates a fully interconnected porous structure in the membrane. The porosity is on the order of the micrometer scale and the membrane shows a gradient of pore size across the membrane cross-section. The membrane can separate polystyrene latex particles of different size and undergoes actuation in contact with acetone due to the asymmetric porous structure...
June 26, 2017: Macromolecular Rapid Communications
Dezhong Zhang, Chunyu Liu, Ruiliang Xu, Bo Yin, Yu Chen, Xindong Zhang, Fengli Gao, Shengping Ruan
A novel dark self-depleting ultraviolet (UV) photodetector basing on the TiO2/NiO pn heterojunction was demonstrated with lower dark current (Idark) and noise. The NiO layer and Ni/Au composite electrode were fabricated by the smart one-step oxidation method, which was firstly employed in the fabrication of UV photodetector. In dark, the depleted pn heterojunction structure could effectively reduce the majority carrier density in TiO2/NiO films, demonstrating high resistance state, which contributed to the lower Idark of 0...
June 26, 2017: Nanotechnology
Hirofumi Naito, Kenta Nishino, Yasuhiro Morisaki, Kazuo Tanaka, Yoshiki Chujo
It was known that the aryl-substituted o-carboranes showed highly-efficient solid-state emission in the previous studies. To demonstrate color tuning of solid-state emission from aryl-o-carborane-based system, bis-o-carborane-substituted oligoacenes were synthesized and their properties were systematically investigated. Optical and electrochemical measurements revealed efficient decreases in energy band gaps and lowest unoccupied molecular orbital (LUMO) levels by adding the number of fused benzene rings for the extension of π-conjugation...
June 26, 2017: Chemistry, An Asian Journal
Manju Saraswathy, Jeffrey W Stansbury, Devatha P Nair
Significant efforts have been expended to mitigate plasticizer migration from crosslinked methacrylic and poly(vinyl chloride) polymer networks by synthesizing reactive plasticizers that can blend homogenously within the networks to reduce polymer property change, acute toxicity and downstream environmental effects of plasticizer migration with limited and varying amount of success. We hypothesized that appropriate thiol-functionalized nanogels synthesized using the same monomers as the parent network to generate highly compact, crosslinked structures will form thermally stable, homogenous networks and perform as optimal reactive plasticizers...
April 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Henry Córdova, Cristina Sánchez-Montes, Pedro G Delgado-Guillena, Victor J Morales, Oriol Sendino, Begoña González-Suárez, Andrés Cárdenas, Maria Pellisé, Isis K Araujo, Àngels Ginés, Josep Llach, Gloria Fernández-Esparrach
INTRODUCTION: There is an opportunity for improvement in the recording and measuring of quality indicators. However, no previous experiences exist in our field in terms of their compliance in esophagogastroduodenoscopy (EGD). OBJECTIVE: To analyse compliance with EGD quality criteria and evaluate improvement after conducting a training programme. PATIENTS AND METHODS: Comparative study of 2 cohorts: one retrospective (control group) and one prospective (intervention group), before and after a training programme consisting of an information session and the report writing improvement programme...
June 22, 2017: Gastroenterología y Hepatología
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