Search Results
Results 1 - 50 of 1417
1 2 3 4 5 6 7 8 9 10 >
Nishiyama Yoshitaka Y Department of Biochemistry and Molecular Biology, Graduate School of Science and Engineering and Institute for Environmental Science and Technology, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, 338-8570, Japan, - - 2014
When photosynthetic organisms are exposed to abiotic stress, their photosynthetic activity is significantly depressed. In particular, photosystem II (PSII) in the photosynthetic machinery is readily inactivated under strong light and this phenomenon is referred to as photoinhibition of PSII. Other types of abiotic stress act synergistically with light stress to ...
Prakash Bokolia Naveen - - 2014
Mechanosensory transduction underlies the perception of touch, sound and acceleration. The mechanical signals exist in the environment are re-sensed by the specialized mechanosensory cells, which convert the external forces into the electrical signals. Hearing is a magnificent example that relies on the mechanotransduction mediated by the auditory cells, for example ...
Sabino C P CP Center for Lasers and Applications, IPEN-CNEN/SP, São Paulo, SP, - - 2014
Antimicrobial photodynamic therapy (APDT) combined with endodontic treatment has been recognized as an alternative approach to complement conventional root canal disinfection methods on bacterial biofilms. We developed an in  vitro model of bioluminescent Candida albicans biofilm inside curved dental root canals and investigated the microbial reduction produced when different light ...
Moree Wilna J - - 2014
Coral reefs are intricate ecosystems that harbor diverse organisms, including 25% of all marine fish. Healthy corals exhibit a complex symbiosis between coral polyps, endosymbiotic alga and an array of microorganisms, called the coral holobiont. Secretion of specialized metabolites by coral microbiota is thought to contribute to the defense of ...
Choy Wallace C H WC Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, - - 2014
Two of the recent major research topics in optoelectronic devices are discussed: the development of new organic materials (both molecular and polymeric) for the active layer of organic optoelectronic devices (particularly organic light-emitting diodes (OLEDs)), and light management, including light extraction for OLEDs and light trapping for organic solar cells ...
Hultberg Malin M Department of Biosystems and Technology, Swedish University of Agricultural Sciences, P.O. Box 103, 230 53, Alnarp, Sweden, - - 2014
Formation of biofilm on surfaces is a common feature in aquatic environments. Major groups of inhabitants in conditions where light is present are photoautotrophic microorganisms, such as cyanobacteria and microalgae. This study examined the effect of light quality on growth and biofilm formation of the microalgal species Chlorella vulgaris. Dense ...
Manoil Daniel D Endodontics Unit, Section of Dental Medicine, University of Geneva, Geneva, Switzerland 19 rue Barthelemy Menn CH-1205 Geneva. Electronic address: - - 2014
Streptococcus mutans biofilms are considered as primary causative agents of dental caries. Photodynamic antimicrobial chemotherapy (PACT) has been recently proposed as a strategy for inactivating dental biofilms. This study aimed to investigate the effect of blue light-activated curcumin on S. mutans viability and to explore its potential as a new ...
Zhang Dongdong D Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, 100084, PR - - 2014
Materials with small singlet-triplet splits (ΔEST s) are introduced as sensitizing hosts to excite fluorescent dopants, breaking the trade-off between small ΔEST and high radiative decay rates. A highly efficient orange-fluorescent organic light-emitting diode (OLED) is prepared, showing a maximum external quantum efficiency of 12.2%.
Croce Roberta R Department of Biophysics of Photosynthesis/Energy, VU University Amsterdam, Amsterdam, The - - 2014
Photosynthetic organisms are crucial for life on Earth as they provide food and oxygen and are at the basis of most energy resources. They have a large variety of light-harvesting strategies that allow them to live nearly everywhere where sunlight can penetrate. They have adapted their pigmentation to the spectral ...
Wang Zi Jun ZJ Max Planck Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany. - - 2014
High surface area porous conjugated polymers were synthesized via the high internal phase emulsion polymerization technique and micropore engineering as efficient heterogeneous photocatalysts for highly selective oxidation of organic sulfides to sulfoxides under visible light.
Moehninsi Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki, 305-8572, Japan, - - 2014
Raphanusanin (Ra) is a light-induced inhibitor of hypocotyl growth that responds to unilateral blue light illumination in radish seedlings. We have previously shown that Ra regulates genes that are involved in common defense mechanisms. Many genes that are induced by Ra are also positively regulated by early blue light. To ...
Sterer Nir N Tel Aviv University, Goldschleger School of Dental Medicine; - - 2014
Oral malodour is considered to be caused mainly by the production of volatile sulfide compounds (VSC) by anaerobic Gram-negative oral bacteria. Previous study showed that these bacteria were susceptible to blue light (wavelengths of 400- 500 nm). In the present study, we tested the effect of blue light in the ...
Chandler Danielle E DE Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, - - 2014
Purple photosynthetic bacteria harvest light using pigment-protein complexes which are often arranged in pseudo-organelles called chromatophores. A model of a chromatophore from Rhodospirillum photometricum was constructed based on atomic force microscopy data. Molecular-dynamics simulations and quantum-dynamics calculations were performed to characterize the intercomplex excitation transfer network and explore the interplay between ...
Spaeth Andreas - - 2014
Increasing antibiotic resistances in microorganisms involve serious problems in public health. This demands alternative approaches for killing pathogens to supplement standard treatment methods. Photodynamic inactivation of bacteria (PIB) uses light activated photosensitizers (PS) to generate reactive oxygen species immediately upon illumination, inducing lethal phototoxicity. Positively charged phenalen-1-one derivatives are a ...
Yoshii Tatsuyuki T Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, - - 2014
Spatiotemporal control of fluidity inside a soft matrix by external stimuli allows real-time manipulation of nano/micromaterials. In this study, we report a two-photon-responsive peptide-based supramolecular hydrogel, the fluidity of which was dramatically controlled with high spatial resolution (10 μm×10 μm×10 μm). The off-on switching of the Brownian motion of nanobeads ...
Harris Frederick F School of Forensic and Investigative Science, University of Central Lancashire, Preston, PR1 2HE, - - 2014
Sonodynamic antimicrobial chemotherapy (SACT) is a novel modality uses ultrasound to kill bacteria by the activation of molecules termed sonosensitisers (SS) to produce reactive oxygen species that are toxic to microbes although microbial resistance to this modality has been reported. There are a growing number of SS being reported with ...
Naghiloo S S Department of Plant Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, - - 2014
The Scutellaria is a Labiatae genus (subfamily Scutellarioideae) with a highly specialised floral structure. The genus is characterised by a peculiar two-lobed calyx with a projecting appendage, named the scutellum. Here, we present a detailed analysis of floral development, using epi-illumination light microscopy, to clarify open questions about its floral ...
Helmy Sameh - - 2014
A versatile new class of organic photochromic molecules that offers an unprecedented combination of physical properties including tunable photoswitching using visible light, excellent fatigue resistance and large polarity changes is described. These unique features offer significant opportunities in diverse fields ranging from biosensors to targeted delivery systems while also allowing ...
Heylighen Francis F Evolution, Complexity and Cognition group Vrije Universiteit Brussel. - - 2014
Aging is analyzed as the spontaneous loss of adaptivity and increase in fragility that characterizes dynamic systems. Cybernetics defines the general regulatory mechanisms that a system can use to prevent or repair the damage produced by disturbances. According to the law of requisite variety, disturbances can be held in check ...
Bian Tong T Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China; University of Chinese Academy of Sciences, Beijing, 10049, P. R. - - 2014
A novel versatile light-triggered strategy is developed to organize inorganic nanoparticles (NPs) into nanovesicles with single or multiple layers in mixed solvents. This strategy constitutes a new assembly mechanism based on the photo-oxidation of thiol ligands. Compared with currently-used individual semiconductor NPs, the prepared CdSe QD vesicles exhibit an improved ...
Martin Cyrus C Senior Scientific Editor, Current - - 2014
The term stress can be broadly construed, with some forms constituting an essential part of developmental processes and others representing potentially harmful changes in the environment. How an organism deals with stress is also varied and can develop on various times scales, from milliseconds, as in rapid homeostatic responses, to ...
Sánchez-Guardado Luis Óscar LO Department of Cell Biology, Faculty of Science, University of Extremadura, 06071 Badajoz, - - 2014
The inner ear is an intricate three-dimensional sensory organ that arises from a flat, thickened portion of the ectoderm termed the otic placode. There is evidence that the ontogenetic steps involved in the progressive specification of the highly specialized inner ear of vertebrates involve the concerted actions of diverse patterning ...
Gil-Rodríguez Paloma P Laboratorio de Bioquímica y Resonancia Magnética Nuclear, Centro de Investigaciones Químicas, Universidad Atónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, - - 2014
Primary amyloidosis (AL) is the most common amyloid systemic disease and it is characterized by the deposition of immunoglobulin light-chain amyloid fibers in different organs, causing organ failure. The germ-line lambda 3 immunoglobulin light-chain proteins have been correlated with the AL condition. Two mutants have been derived from this germ-line, ...
Bayon Chloé C Centre d'Elaboration de Matériaux et d'Etudes Structurales (CEMES), CNRS, University Paul-Sabatier, 29 rue J. Marvig, 31055 Toulouse Cedex 4, France. - - 2014
The ability to guide light on the mesoscopic scale is important both scientifically and technologically. Especially relevant is the development of wavelength-tunable light-shaping microdevices. Here we demonstrate the use of cholesteric liquid crystal polygonal textures organized as an array of microlenses for this purpose. The beam shaping is controlled by ...
Chen Zhaowei - - 2014
In this work, by utilizing photochromic spiropyrans conjugated upconversion nanolamps, we have successfully prepared NIR/visible light tuned interfacially active nanoparticles for the formulation of Pickering emulsions with reversible inversion properties. By loading a model enantioselective biocatalytic active bacteria Alcaligenes faecalis ATCC 8750 in the aqueous phase, we demonstrated for the ...
Zafrilla G G Universitat de València (Cavanilles Institute of Biodiversity and Evolutionary Biology), Valencia, - - 2014
Bacterial comfort is central to biotechnological applications. Here, we report the characterization of different sensoring systems, the first step within a broader synthetic biology-inspired light-mediated strategy to determine Escherichia coli perception of environmental factors critical to bacterial performance. We did so by directly 'asking' bacterial cultures with light-encoded questions corresponding ...
Shiigi Hiroshi H Department of Applied Chemistry, Osaka Prefecture University, 1-2 Gakuen, Naka, Sakai, Osaka 599-8570, Japan. - - 2014
We demonstrate a simple manipulation of gold nanoparticles that creates a structure-dependent nanometer-scale antenna on the surface of bacteria. Our studies illuminate the concept of the "effective use of light" based on the absorption and emission of light by antennas formed on bacteria.
Rucz Péter P Budapest University of Technology and Economics, Department of Networked Systems and Services, Laboratory of Acoustics and Studio Technologies, 2 Magyar Tudósok körútja, Budapest H-1117, - - 2014
The effect of tuning slots on the sound characteristics of labial organ pipes is investigated in this paper by means of laboratory experiments. Besides changing the pitch of the pipe, the tuning slot also plays an important role in forming the timbre. The objectives of this contribution are to document ...
Gao Shengpu S School of Chemical Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand; School of Biological Sciences, The University of Auckland, Private Bag 92019, Auckland, New Zealand; Institute of Food and Agricultural Standardization, China National Institute of Standardization, Beijing 10088, - - 2014
High-frequency (850 kHz) ultrasound was used to inactivate bacteria and yeast at different growth phases under controlled temperature conditions. Three species of bacteria, Enterobacter aerogenes, Bacillus subtilis and Staphylococcus epidermidis as well as a yeast, Aureobasidium pullulans were considered. The study shows that high-frequency ultrasound is highly efficient in inactivating the ...
Amir Ariel A Department of Physics, Harvard University, Cambridge, MA 02138 - - 2014
Rod-like bacteria maintain their cylindrical shapes with remarkable precision during growth. However, they are also capable to adapt their shapes to external forces and constraints, for example by growing into narrow or curved confinements. Despite being one of the simplest morphologies, we are still far from a full understanding of ...
Chen Jheng-Yuan JY Department of Applied Chemistry, National Chiao Tung University , 1001 University Road, Hsinchu 30010, - - 2014
An ITO substrate with periodic surface nanostructures was used to induce strong diffusion and diffraction of incident light. The nanostructures were fabricated using nanoimprint lithography on photoresist followed by coating of the ITO layer and organic materials with uniform morphology. The nanostructures embedded into the ITO layer were found to ...
Al Mijan Mohammad M Department of Food Science and Technology, Sejong University, Seoul 143-747, - - 2014
This study was carried out to investigate the possibility of adding nanopowdered eggshell (NPES) into yogurt to improve the functionality of yogurt and the effects of adding NPES on the physicochemical, microbial, and sensory properties of the products during storage. The pH and mean lactic acid bacteria counts of NPES-added ...
Yang Qing-Yuan QY Lehn Institute of Functional Materials, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275 (China); Laboratoire de Chimie Supramoléculaire, Institut de Science et d'Ingénierie Supramoléculaires (ISIS), Université de Strasbourg, 8 allée Gaspard Monge, Strasbourg 67000 - - 2014
White-light-emitting materials and devices have attracted enormous interest because of their great potential for various lighting applications. We herein describe the light-emitting properties of a series of new difunctional organic molecules of remarkably simple structure consisting of two terminal 4-pyridone push-pull subunits separated by a polymethylene chain. They were found ...
De Maayer Pieter P Centre for Microbial Ecology and Genomics (CMEG), Department of Genetics, University of Pretoria, Pretoria, South - - 2014
Much of the Earth's surface, both marine and terrestrial, is either periodically or permanently cold. Although habitats that are largely or continuously frozen are generally considered to be inhospitable to life, psychrophilic organisms have managed to survive in these environments. This is attributed to their innate adaptive capacity to cope ...
Boron Agnieszka Karolina AK Plant Growth and Development, Biology Department, University of Antwerp, Groenenborgerlaan 122, 2020, Antwerp, - - 2014
Developmental biology studies in general benefit from model organisms that are well characterized. Arabidopsis thaliana fulfills this criterion and represents one of the best experimental systems to study developmental processes in higher plants. Light is a crucial factor that drives photosynthesis, but that also regulates plant morphogenesis. As the hypocotyl ...
Chen Min M School of Biological Sciences, University of Sydney, Sydney, New South Wales 2006 Australia; email: - - 2014
Chlorophylls are magnesium-tetrapyrrole molecules that play essential roles in photosynthesis. All chlorophylls have similar five-membered ring structures, with variations in the side chains and/or reduction states. Formyl group substitutions on the side chains of chlorophyll a result in the different absorption properties of chlorophyll b, chlorophyll d, and chlorophyll f. ...
Hopkinson Matthew N MN Organisch-Chemisches Institut, NRW Graduate School of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster (Germany), Fax: - - 2014
The photoredox activation of organic substrates with visible light is a powerful methodology that generates reactive radical species under very mild conditions. When combined with another catalytic process in a dual catalytic system, novel, visible-light-promoted transformations have been realized that do not proceed using either catalyst in isolation. In this ...
Okazaki Ayako A Division of Biological Science, Nagoya University Graduate School of Science, Furo-cho, Chikusa-ku, Nagoya, - - 2014
Recent development of optogenetic techniques, which utilize light-driven ion channels or ion pumps for controlling the activity of excitable cells, has greatly facilitated the investigation of nervous systems in vivo. A new generation of optical silencers includes outward-directed proton pumps, such as Arch, which have several advantages over currently widely ...
Taisova A S AS Belozersky Research Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119992, Russia. - - 2014
This work continuous a series of studies devoted to discovering principles of organization of natural antennas in photosynthetic microorganisms that generate in vivo large and highly effective light-harvesting structures. The largest antenna is observed in green photosynthesizing bacteria, which are able to grow over a wide range of light intensities ...
Petersen Sibylle S 1Research Group on Health Psychology, KU - - 2014
Adequate perception of bodily sensations is essential to protect health. However, misinterpretation of signals from within the body is common and can be fatal, for example, in asthma or cardiovascular disease. We suggest that placing interoceptive stimuli into interoceptive categories (e.g., the category of symptoms vs. the category of benign ...
Longo Giovanni G Ecole Polytechnique Fédérale de Lausanne, LPMV, Lausanne, Switzerland; Istituto Superiore di Sanità, Rome, - - 2014
Originally invented for topographic imaging, atomic force microscopy (AFM) has evolved into a multifunctional biological toolkit, enabling to measure structural and functional details of cells and molecules. Its versatility and the large scope of information it can yield make it an invaluable tool in any biologically oriented laboratory, where researchers ...
Gealageas Ronan R Institut de Chimie des Substances Naturelles, UPR 2301, Centre National de la Recherche Scientifique, Avenue de la Terrasse, 91198, Gif-sur-Yvette, - - 2014
The main analytical use of Ca(2+)-regulated photoproteins from luminous coelenterates is for real-time non-invasive visualization of intracellular calcium concentration ([Ca(2+)]i) dynamics in cells and whole organisms. A limitation of this approach for in vivo deep tissue imaging is the fact that blue light emitted by the photoprotein is highly absorbed ...
Pellet Norman N Laboratory of Photonics and Interfaces, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology, Station 6, 1015 Lausanne (Switzerland); Max-Planck-Institute for Solid-State Research, Heisenbergstrasse 1, 70569 Stuttgart - - 2014
Hybrid organic-inorganic lead halide perovskite APbX3 pigments, such as methylammonium lead iodide, have recently emerged as excellent light harvesters in solid-state mesoscopic solar cells. An important target for the further improvement of the performance of perovskite-based photovoltaics is to extend their optical-absorption onset further into the red to enhance solar-light ...
Nussinovitch Udi U Sohnis Family Research Laboratory for Cardiac Electrophysiology and Regenerative Medicine; the Rappaport Faculty of Medicine and Research Institute, Technion - Israel Institute of - - 2014
Optogenetics approaches, utilizing light-sensitive proteins, have emerged as unique experimental paradigms to modulate neuronal excitability. We aimed to evaluate whether a similar strategy could be used to control cardiac-tissue excitability.Methods and ResultsA combined cell and gene therapy strategy was developed in which fibroblasts were transfected to express the light-activated depolarizing ...
Sato-Takabe Yuki Y Graduate School of Environmental Science, Hokkaido - - 2014
This paper describes the photosynthetic response of a Roseobacter strain of marine aerobic anoxygenic phototrophicbacteria to an organic substrate limitation. In batch cultures, higher values of the spheroidenone/bacteriochlorophyll a ratio were observed under substrate-deficient conditions. Interestingly, the maximum photochemical quantum efficiencies of the photosystem under substrate-deficient conditions using blue or ...
Liscum Emmanuel E Division of Biological Sciences, University of Missouri, Columbia, Missouri - - 2014
Phototropism, or the differential cell elongation exhibited by a plant organ in response to directional blue light, provides the plant with a means to optimize photosynthetic light capture in the aerial portion and water and nutrient acquisition in the roots. Tremendous advances have been made in our understanding of the ...
Zhang Chuan C Key Laboratory of New Materials and Facilities for Rural Renewable Energy (Henan Agricultural University), Ministry of Agriculture of China, Henan Agricultural University, Zhengzhou, China; Institute of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou, - - 2014
In this work, effects of mass transfer and light intensity on performance of substrate biodegradation by cell-immobilized photosynthetic bacteria were investigated within an annular fiber-illuminating bioreactor (AFIBR). In AFIBR, stable biofilm of photosynthetic bacteria was generated on the surface of side-glowing optical fiber to provide sufficient light supply and uniform ...
Ryu Min-Hyung MH Department of Molecular Biology, University of Wyoming , 1000 East University Avenue, Dept. 3944, Laramie, Wyoming 82071, United - - 2014
Enormous potential of cell-based therapeutics is hindered by the lack of effective means to control genetically engineered cells in mammalian tissues. Here, we describe a synthetic module for remote photocontrol of engineered cells that can be adapted for such applications. The module involves photoactivated synthesis of cyclic dimeric GMP (c-di-GMP), ...
Huang Sizhou S Development and Regeneration Key Laboratory of Sichuan Province, Department of Anatomy and Histology and Embryology, Chengdu Medical College, Chengdu, China; Key Laboratory of Freshwater Fish Reproduction and Development, Ministry of Education, Laboratory of Molecular Developmental Biology, School of Life Sciences, Southwest University, Beibei, Chongqing, - - 2014
Disruption of Nodal in the lateral plate mesoderm (LPM) usually leads to left-right (LR) patterning defects in multiple organs. However, whether the LR patterning of organs is always regulated in a coupled way has largely not yet been elucidated. In addition, whether other crucial regulators exist in the LPM that ...
Palghat Udayashankar Arun A AK Neurobiologie und Biosensorik, Institute for Cell Biology and Neuroscience, Goethe University, Frankfurt/Main, - - 2014
Travelling waves are the physical basis of frequency discrimination in many vertebrate and invertebrate taxa, including mammals, birds, and some insects. In bushcrickets (Tettigoniidae), the crista acustica is the hearing organ that has been shown to use sound-induced travelling waves. Up to now, data on mechanical characteristics of sound-induced travelling ...
1 2 3 4 5 6 7 8 9 10 >