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https://www.readbyqxmd.com/read/28431298/bioluminescence-emissions-of-female-fireflies-of-the-species-luciola-praeusta
#1
Mana Mohan Rabha, Upamanyu Sharma, Angana Goswami, Anurup Gohain Barua
Numerous investigations have been carried out on bioluminescence emissions from male fireflies. However, very few observations have been made on the emitted light from female specimens. Even in those, apart from observing responses from females to courtship flashes from conspecific males, detailed studies have not been performed. Here we present a first report on the light of female fireflies of the Indian species Luciola praeusta Kiesenwetter 1874 (Coleoptera:Lampyridae:Luciolinae). In the steady-state emission spectrum over the temperature range of 20-40°C, the peak wavelength is the same as, while the full width at half maximum is larger than, that of a male specimen of this species...
April 4, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28430522/impact-of-naturalistic-lighting-on-hospitalized-stroke-patients-in-a-rehabilitation-unit-design-and-measurement
#2
Anders West, Poul Jennum, Sofie Amalie Simonsen, Birgit Sander, Milena Pavlova, Helle K Iversen
INTRODUCTION AND RATIONALE: Stroke is a major cause of acquired cerebral disability among adults, frequently accompanied by depression, anxiety, cognitive impairment, disrupted sleep and fatigue. New ways of intervention to prevent these complications are therefore needed. The major circadian regulator, the suprachiasmatic nucleus, is mainly controlled by natural daylight, and the blue spectrum is considered the most powerful. During stroke rehabilitation, patients typically are mostly indoors and therefore not exposed to the natural daytime variation in light intensity...
April 21, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28430261/wideband-spectrum-analysis-of-ultra-high-frequency-radio-wave-signals-due-to-advanced-one-phonon-non-collinear-anomalous-light-scattering
#3
Alexandre S Shcherbakov, Adan Omar Arellanes
We present a principally new acousto-optical cell providing an advanced wideband spectrum analysis of ultra-high frequency radio-wave signals. For the first time, we apply a recently developed approach with the tilt angle to a one-phonon non-collinear anomalous light scattering. In contrast to earlier cases, now one can exploit a regime with the fixed optical wavelength for processing a great number of acoustic frequencies simultaneously in the linear regime. The chosen rutile-crystal combines a moderate acoustic velocity with low acoustic attenuation and allows us wide-band data processing within GHz-frequency acoustic waves...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430218/scattering-of-one-dimensional-airy-beam-light-sheet-with-finite-energy-by-a-sphere
#4
Zhaolou Cao, Chunjie Zhai
A one-dimensional Airy beam light sheet has the advantage of nondiffraction and self-reconstruction after encountering particles. The angular scattering of an Airy beam by a homogeneous sphere is numerically studied in this paper using Mie theory and a plane-wave spectrum method. The effects of sphere radius, refractive index, beam width, and sphere position on the angular distribution of scattering light are simulated. Correlation coefficients are employed to investigate whether Airy beam scattering can be approximated to be plane-wave scattering for computational efficiency...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429324/photomovement-in-euglena
#5
Donat-P Häder, Mineo Iseki
Motile microorganisms such as the green Euglena gracilis use a number of external stimuli to orient in their environment. They respond to light with photophobic responses, photokinesis and phototaxis, all of which can result in accumulations of the organisms in suitable habitats. The light responses operate synergistically with gravitaxis, aerotaxis and other responses. Originally the microscopically obvious stigma was thought to be the photoreceptor, but later the paraxonemal body (PAB, paraflagellar body) has been identified as the light responsive organelle, located in the trailing flagellum inside the reservoir...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28429200/achalasia-it-is-not-all-black-and-white
#6
REVIEW
Santosh Sanagapalli, Rami Sweis
PURPOSE OF REVIEW: This review aims to shed light on subtleties of achalasia diagnosis, including potential pitfalls that may lead to errors. Optimal methods for assessment of disease severity and the relationship between achalasia and other motility disorders will also be reviewed with an emphasis on recent findings from the literature. RECENT FINDINGS: Adjunctive testing with viscous substances or larger water volumes should be used routinely as it improves the accuracy of achalasia diagnosis...
June 2017: Current Gastroenterology Reports
https://www.readbyqxmd.com/read/28427391/fish-with-red-fluorescent-eyes-forage-more-efficiently-under-dim-blue-green-light-conditions
#7
Ulrike Katharina Harant, Nicolaas Karel Michiels
BACKGROUND: Natural red fluorescence is particularly conspicuous in the eyes of some small, benthic, predatory fishes. Fluorescence also increases in relative efficiency with increasing depth, which has generated speculation about its possible function as a "light organ" to detect cryptic organisms under bluish light. Here we investigate whether foraging success is improved under ambient conditions that make red fluorescence stand out more, using the triplefin Tripterygion delaisi as a model system...
April 20, 2017: BMC Ecology
https://www.readbyqxmd.com/read/28427329/cross-disorder-comparative-analysis-of-comorbid-conditions-reveals-novel-autism-candidate-genes
#8
Leticia Diaz-Beltran, Francisco J Esteban, Maya Varma, Alp Ortuzk, Maude David, Dennis P Wall
BACKGROUND: Numerous studies have highlighted the elevated degree of comorbidity associated with autism spectrum disorder (ASD). These comorbid conditions may add further impairments to individuals with autism and are substantially more prevalent compared to neurotypical populations. These high rates of comorbidity are not surprising taking into account the overlap of symptoms that ASD shares with other pathologies. From a research perspective, this suggests common molecular mechanisms involved in these conditions...
April 20, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28426165/hydrogen-peroxide-dependent-antibacterial-action-of-melilotus-albus-honey
#9
Patrycja Sowa, Dorota Grabek-Lejko, Monika Wesołowska, Sylwia Swacha, Małgorzata Dżugan
Honey originating from different floral sources exhibits the broad-spectrum of antibacterial activity as a result of the presence of hydrogen peroxide as well as non peroxide bioactive compounds. The mechanisms of antibacterial activity of Polish melilot honey were investigated for the first time. Polish melilot honey samples (Melilotus albus biennal -3 and annual-5, Melilotus officinalis -1) were collected directly from beekeepers and analyzed for pollen profile, basic physicochemical parameters, antioxidant capacity, radical scavenging activity, total phenolics contents as well as antibacterial properties against pathogenic bacteria Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella spp...
April 20, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28426140/stomatal-kinetics-and-photosynthetic-gas-exchange-along-a-continuum-of-iso-to-anisohydric-regulation-of-plant-water-status
#10
Frederick C Meinzer, Duncan D Smith, David R Woodruff, Danielle E Marias, Katherine A McCulloh, Ava R Howard, Alicia L Magedman
Species' differences in the stringency of stomatal control of plant water potential represent a continuum of iso- to anisohydric behavior. However, little is known about how quasi-steady state stomatal regulation of water potential may relate to dynamic behavior of stomata and photosynthetic gas exchange in species operating at different positions along this continuum. Here we evaluated kinetics of light-induced stomatal opening, activation of photosynthesis and features of quasi-steady state photosynthetic gas exchange in ten woody species selected to represent different degrees of anisohydry...
April 20, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28426097/landscape-of-rna-polyadenylation-in-e-coli
#11
Alexandre Maes, Céline Gracia, Nicolas Innocenti, Kaiyang Zhang, Erik Aurell, Eliane Hajnsdorf
Polyadenylation is thought to be involved in the degradation and quality control of bacterial RNAs but relatively few examples have been investigated. We used a combination of 5΄-tagRACE and RNA-seq to analyze the total RNA content from a wild-type strain and from a poly(A)polymerase deleted mutant. A total of 178 transcripts were either up- or down-regulated in the mutant when compared to the wild-type strain. Poly(A)polymerase up-regulates the expression of all genes related to the FliA regulon and several previously unknown transcripts, including numerous transporters...
March 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28424573/global-sensory-qualities-and-aesthetic-experience-in-music
#12
Pauli Brattico, Elvira Brattico, Peter Vuust
A well-known tradition in the study of visual aesthetics holds that the experience of visual beauty is grounded in global computational or statistical properties of the stimulus, for example, scale-invariant Fourier spectrum or self-similarity. Some approaches rely on neural mechanisms, such as efficient computation, processing fluency, or the responsiveness of the cells in the primary visual cortex. These proposals are united by the fact that the contributing factors are hypothesized to be global (i.e., they concern the percept as a whole), formal or non-conceptual (i...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28418034/light-and-circadian-controlled-genes-respond-to-a-broad-light-spectrum-in-puffer-fish-derived-fugu-eye-cells
#13
Keiko Okano, Shoichi Ozawa, Hayao Sato, Sawa Kodachi, Masaharu Ito, Toshiaki Miyadai, Akihiro Takemura, Toshiyuki Okano
Some cell lines retain intrinsic phototransduction pathways to control the expression of light-regulated genes such as the circadian clock gene. Here we investigated the photosensitivity of a Fugu eye, a cell line established from the eye of Takifugu rubripes, to examine whether such a photosensitive nature is present. Microarray analysis identified 15 genes that showed blue light-dependent change at the transcript level. We investigated temporal profiles of the light-induced genes, as well as Cry and Per, under light-dark, constant light (LL), and constant dark (DD) conditions by quantitative RT-PCR...
April 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28415231/gap-solitons-in-rabi-lattices
#14
Zhaopin Chen, Boris A Malomed
We introduce a two-component one-dimensional system, which is based on two nonlinear Schrödinger or Gross-Pitaevskii equations (GPEs) with spatially periodic modulation of linear coupling ("Rabi lattice") and self-repulsive nonlinearity. The system may be realized in a binary Bose-Einstein condensate, whose components are resonantly coupled by a standing optical wave, as well as in terms of the bimodal light propagation in periodically twisted waveguides. The system supports various types of gap solitons (GSs), which are constructed, and their stability is investigated, in the first two finite bandgaps of the underlying spectrum...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28415223/scattering-enhanced-absorption-and-interference-produce-a-golden-wing-color-of-the-burnished-brass-moth-diachrysia-chrysitis
#15
Dejan Pantelić, Svetlana Savić-Šević, Dejan V Stojanović, Srećko Ćurčić, Aleksandar J Krmpot, Mihailo Rabasović, Danica Pavlović, Vladimir Lazović, Vojislav Milošević
Here we report how interference and scattering-enhanced absorption act together to produce the golden wing patches of the burnished brass moth. The key mechanism is scattering on rough internal surfaces of the wing scales, accompanied by a large increase of absorption in the UV-blue spectral range. Unscattered light interferes and efficiently reflects from the multilayer composed of the scales and the wing membranes. The resulting spectrum is remarkably similar to the spectrum of metallic gold. Subwavelength morphology and spectral and absorptive properties of the wings are described...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414378/interference-filter-tilting-to-detect-a-polycyclic-aromatic-hydrocarbon-at-the-second-harmonic-of-wavelength-modulation-frequency
#16
Dmitri Lanevski, Koit Mauring, Eric Tkaczyk
We present a practical implementation of the wavelength-modulation spectroscopy technique with second-harmonic detection for selective detection and concentration measurements of polycyclic aromatic hydrocarbons (PAHs)-common fossil fuel pollutants. The method is based on excitation light wavelength modulation around the maximum of a narrow peak in the absorption spectrum of a PAH and lock-in detection of fluorescence at the second harmonic of the excitation wavelength modulation frequency. A violet LED is used as the excitation source and wavelength modulation is performed via narrowband interference filter tilting...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28413765/experimental-and-theoretical-examination-of-the-radical-cations-obtained-from-the-chemical-and-electrochemical-oxidation-of-5-aminothiazoles
#17
Kirara Yamaguchi, Toshiaki Murai, Shoichi Kutsumizu, Yohei Miwa, Masahiro Ebihara, Jing-Dong Guo, Norihiro Tokitoh
Chemical or electrochemical one-electron oxidation of 5-N-arylaminothiazoles was found to afford stable radical cations. For chemical oxidation, 1 equivalent of [(4-BrC6H4)3N][SbCl6] (Magic Blue, MB) was added to CH2Cl2 solutions of the thiazoles, and the thus-obtained radicals showed light absorption in the near-infrared region. Electrochemical oxidation also led to bathochromic shifts in the absorption bands, and the obtained spectra were similar to those derived from the chemically oxidized species. These radicals afforded electron paramagnetic resonance (EPR) spectra that are consistent with the notion of stable nitrogen radicals (half-life≤385 h)...
April 2017: ChemistryOpen
https://www.readbyqxmd.com/read/28411595/infrared-absorption-of-methanol-water-clusters-ch3oh-n-h2o-n-1-4-recorded-with-the-vuv-ionization-ir-depletion-technique
#18
Yu-Fang Lee, Anne-Marie Kelterer, Gergely Matisz, Sándor Kunsági-Máté, Chao-Yu Chung, Yuan-Pern Lee
We recorded infrared (IR) spectra in the CH- and OH-stretching regions of size-selected clusters of methanol (M) with one water molecule (W), represented as MnW, n = 1-4, in a pulsed supersonic jet using the photoionization/IR-depletion technique. Vacuum ultraviolet emission at 118 nm served as the source of ionization in a time-of-flight mass spectrometer to detect clusters MnW as protonated forms Mn-1WH(+). The variations in intensities of Mn-1WH(+) were monitored as the wavelength of the IR laser light was tuned across the range 2700-3800 cm(-1)...
April 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28409947/spontaneous-photon-production-in-time-dependent-epsilon-near-zero-materials
#19
A Prain, S Vezzoli, N Westerberg, T Roger, D Faccio
Quantum field theory predicts that a spatially homogeneous but temporally varying medium will excite photon pairs out of the vacuum state. However, this important theoretical prediction lacks experimental verification due to the difficulty in attaining the required nonadiabatic and large amplitude changes in the medium. Recent work has shown that in epsilon-near-zero (ENZ) materials it is possible to optically induce changes of the refractive index of the order of unity, in femtosecond time scales. By studying the quantum field theory of a spatially homogeneous, time-varying ENZ medium, we theoretically predict photon-pair production that is up to several orders of magnitude larger than in non-ENZ time-varying materials...
March 31, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28409939/band-resolved-double-photoemission-spectroscopy-on-correlated-valence-electron-pairs-in-metals
#20
Andreas Trützschler, Michael Huth, Cheng-Tien Chiang, Robin Kamrla, Frank O Schumann, Jürgen Kirschner, Wolf Widdra
Correlated valence electrons in Ag and Cu are investigated using double photoemission spectroscopy driven by a high-order harmonic light source. Electron pairs consisting of two d electrons as well as pairs with one sp and one d electron are resolved in the two-dimensional energy spectrum. Surprisingly, the intensity ratio of sp-d to d-d pairs from Ag is 3 times higher than in the self-convoluted density of states. Our results directly show the band-resolved configurations of electron pairs in solids and emphasize a band-dependent picture for electron correlation even in these paradigmatic metals...
March 31, 2017: Physical Review Letters
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