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https://www.readbyqxmd.com/read/27912863/circadian-rhythm-and-sleep-during-prolonged-antarctic-residence-at-chinese-zhongshan-station
#1
Nan Chen, Quan Wu, Yanlei Xiong, Guang Chen, Dandan Song, Chengli Xu
OBJECTIVE: Residence at Zhongshan Station (69°22'24″S, 76°22'40″E) for over 1 year exposes winter-over members to marked changes of light-dark cycle, ranging from the constant daylight of polar days to the constant darkness of polar nights, in addition to geographic and social isolation. This extreme photoperiodic environment may increase the risk of sleep disturbances and circadian desynchrony. The aim of this study was to investigate the circadian rhythm and sleep phase of Chinese winter-over expeditioners at Zhongshan Station...
December 2016: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/27911375/fabrication-of-white-light-emitting-electrochemical-cells-with-stable-emission-from-exciplexes
#2
Soichi Uchida, Daisuke Takizawa, Satoru Ikeda, Hironori Takeuchi, Suzushi Nishimura, Hiroyuki Nishide, Yoshinori Nishikitani
The authors present an approach for fabricating stable white light emission from polymer light-emitting electrochemical cells (PLECs) having an active layer which consists of blue-fluorescent poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD) and π-conjugated triphenylamine molecules. This white light emission originates from exciplexes formed between PFD and amines in electronically excited states. A device containing PFD, 4,4',4''-tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA), Poly(ethylene oxide) and K2CF3SO3 showed white light emission with Commission internationale de l'éclairage (CIE) coordinates of (0...
November 15, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27910732/binding-of-anti-cardiovascular-drug-to-serum-albumin-an-insight-in-the-light-of-spectroscopic-and-computational-approaches
#3
Tajalli Ilm Chandel, Gulam Rabbani, MohsinVahid Khan, Masihuz Zaman, Parvez Alam, Yasser Shahein, Rizwan Hasan Khan
Isoprenaline hydrochloride is a potential cardiovascular drug helps in the smooth functioning of the heart muscles. So, we have performed the binding study of ISO with BSA. This study was investigated by UV absorption, fluorescence, synchronous fluorescence, circular dichroism etc. The analysis of intrinsic fluorescence data showed the low binding affinity of ISO. The binding constant Kb was 2.8×103 M-1 and binding stoichiometry (n) was approximately one and the Gibb's free energy change at 310 K was determined to be -8...
December 2, 2016: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/27910699/effect-on-measurement-accuracy-of-transillumination-using-sawtooth-shaped-function-optical-signal
#4
Xue Yang, Yajia Hu, Gang Li, Ling Lin
There exist lots of difficulties in optical transillumination of biological tissues, especially, low-level-light detection and low gray-scale resolution could reduce recognition accuracy of differences in tissue. Aiming at the problems, this paper proposes a method for optical transillumination using sawtooth-shaped-function optical signal and frame accumulation technology to explore the spatial information of heterogeneity in the tissue. Sawtooth-shaped-function optical signal combined with frame accumulation technology is applied to realize the low-level-light image detection, where frame accumulation technology improves the signal-to-noise ratio and detection sensitivity, and sawtooth-shaped-function signal improves gray-scale resolution...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910644/development-of-plasma-bolometers-using-fiber-optic-temperature-sensors
#5
M L Reinke, M Han, G Liu, G G van Eden, R Evenblij, M Haverdings, B C Stratton
Measurements of radiated power in magnetically confined plasmas are important for exhaust studies in present experiments and expected to be a critical diagnostic for future fusion reactors. Resistive bolometer sensors have long been utilized in tokamaks and helical devices but suffer from electromagnetic interference (EMI). Results are shown from initial testing of a new bolometer concept based on fiber-optic temperature sensor technology. A small, 80 μm diameter, 200 μm long silicon pillar attached to the end of a single mode fiber-optic cable acts as a Fabry-Pérot cavity when broadband light, λo ∼ 1550 nm, is transmitted along the fiber...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27904435/the-challenges-of-primary-health-care-nurse-leaders-in-the-wake-of-new-health-care-reform-in-norway
#6
Wivi-Ann Tingvoll, Torill Sæterstrand, Leon Mendel McClusky
BACKGROUND: The local municipality, whose management style is largely inspired by the New Public Management (NPM) model, has administrative responsibilities for primary health care in Norway. Those responsible for health care at the local level often find themselves torn between their professional responsibilities and the municipality's market-oriented funding system. The introduction of the new health care reform process known as the Coordination Reform in January 2012 prioritises primary health care while simultaneously promoting a more collaborative and multidisciplinary approach to health care...
2016: BMC Nursing
https://www.readbyqxmd.com/read/27903008/brightness-in-human-rod-vision-depends-on-slow-neural-adaptation-to-quantum-statistics-of-light
#7
Michael E Rudd, Fred Rieke
In human rod-mediated vision, threshold for small, brief flashes rises in proportion to the square root of adapting luminance at all but the lowest and highest adapting intensities. A classical signal detection theory from Rose (1942, 1948) and de Vries (1943) attributed this rise to the perceptual masking of weak flashes by Poisson fluctuations in photon absorptions from the adapting field. However, previous work by Brown and Rudd (1998) demonstrated that the square-root law also holds for suprathreshold brightness judgments, a finding that supports an alternative explanation of the square-root sensitivity changes as a consequence of physiological adaptation (i...
November 1, 2016: Journal of Vision
https://www.readbyqxmd.com/read/27894696/complex-analysis-of-concentrated-antibody-gold-nanoparticle-conjugates-mixtures-using-asymmetric-flow-field-flow-fractionation
#8
Irina V Safenkova, Elvira S Slutskaya, Vasily G Panferov, Anatoly V Zherdev, Boris B Dzantiev
Conjugates of gold nanoparticles (GNPs) with antibodies are powerful analytical tools. It is crucial to know the conjugates' state in both the concentrated and mixed solutions used in analytical systems. Herein, we have applied asymmetrical flow field-flow fractionation (AF4) to identify the conjugates' state. The influence of a conjugate's composition and concentration on aggregation was studied in a true analytical solution (a concentrated mixture with stabilizing components). GNPs with an average diameter of 15...
November 22, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27894385/-effect-of-expanded-lateral-thoracic-abdominal-flap-transferred-with-pedicle-on-repairing-large-area-of-hypertrophic-scar-after-burn-of-the-upper-extremity
#9
C D Xia, J D Xue, H P Di, J L Niu, X L Li, D Y Cao, Q Li, X H Niu
Objective: To observe the effect of expanded lateral thoracic abdominal flap transferred with pedicle on repairing large area of hypertrophic scar after burn of the upper extremity. Methods: Twelve patients with large area of secondary hypertrophic scar 8 month to 3 years after healing of burn wound on the upper extremity were hospitalized in Zhengzhou First People's Hospital from October 2008 to October 2015, with scar area ranging from 11 cm×7 cm to 20 cm×10 cm. Five patients were with limited straightening and bending of elbow...
November 20, 2016: Zhonghua Shao Shang za Zhi, Zhonghua Shaoshang Zazhi, Chinese Journal of Burns
https://www.readbyqxmd.com/read/27893272/action-effects-are-coded-as-transitions-from-current-to-future-stimulation-evidence-from-compatibility-effects-in-tracking
#10
Wilfried Kunde, Constantin Schmidts, Robert Wirth, Oliver Herbort
There is ample evidence that motor actions are stored in terms of, and controlled by, the sensory effects that these actions produce. At present it is unclear, though, whether action control is governed by intended sensory changes (e.g., the transition from darkness to brightness when switching on a light) or only by intended sensory end states (e.g., the light being on). The present study explored the role of sensory changes for action control. To address this issue, participants engaged in a spatial tracking task...
November 28, 2016: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/27892569/an-ab-initio-study-of-the-ground-and-excited-electronic-states-of-the-methyl-radical
#11
A Zanchet, L Bañares, M L Senent, A García-Vela
The ground and some excited electronic states of the methyl radical have been characterized by means of highly correlated ab intio techniques. The specific excited states investigated are those involved in the dissociation of the radical, namely the 3s and 3pz Rydberg states, and the A1 and B1 valence states crossing them, respectively. The C-H dissociative coordinate and the HCH bending angle were considered in order to generate the first two-dimensional ab initio representation of the potential surfaces of the above electronic states of CH3, along with the nonadiabatic couplings between them...
November 28, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27883131/photo-induced-magnetization-and-first-principles-calculations-of-a-two-dimensional-cyanide-bridged-co-w-bimetal-assembly
#12
Y Miyamoto, T Nasu, N Ozaki, Y Umeta, H Tokoro, K Nakabayashi, S Ohkoshi
A two-dimensional cyanide-bridged Co-W bimetal assembly, (H5O2(+))[Co(4-bromopyridine)2{W(CN)8}], was prepared. A synchrotron radiation (SR) X-ray single-crystal measurement shows that the crystal structure is monoclinic in the P21/c space group. Magnetic and spectroscopic measurements show that this assembly takes Co(S = 0)-W(IV)(S = 0) in the temperature range of 2-390 K. Such a wide temperature range Co-W(IV) phase has not been reported so far. First-principles calculations show that the band gap is composed of a W(IV) valence band and a Co(III) conduction band...
November 24, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27883065/cycles-of-circadian-illuminance-are-sufficient-to-entrain-and-maintain-circadian-locomotor-rhythms-in-drosophila
#13
Eunjoo Cho, Ji Hye Oh, Euna Lee, Young Rag Do, Eun Young Kim
Light at night disrupts the circadian clock and causes serious health problems in the modern world. Here, we show that newly developed four-package light-emitting diodes (LEDs) can provide harmless lighting at night. To quantify the effects of light on the circadian clock, we employed the concept of circadian illuminance (CIL). CIL represents the amount of light weighted toward the wavelengths to which the circadian clock is most sensitive, whereas visual illuminance (VIL) represents the total amount of visible light...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27882483/effect-of-co2-concentration-on-growth-and-biochemical-composition-of-newly-isolated-indigenous-microalga-scenedesmus-bajacalifornicus-bbklp-07
#14
Lakkanagouda Patil, Basappa Kaliwal
Photosynthetic mitigation of CO2 through microalgae is gaining great importance due to its higher photosynthetic ability compared to plants, and the biomass can be commercially exploited for various applications. CO2 fixation capability of the newly isolated freshwater microalgae Scenedesmus bajacalifornicus BBKLP-07 was investigated using a 1-l photobioreactor. The cultivation was carried at varying concentration of CO2 ranging from 5 to 25%, and the temperature and light intensities were kept constant. A maximum CO2 fixation rate was observed at 15% CO2 concentration...
November 23, 2016: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/27881991/dissecting-long-term-adjustments-of-photoprotective-and-photo-oxidative-stress-acclimation-occurring-in-dynamic-light-environments
#15
Shizue Matsubara, Trang Schneider, Veronica G Maurino
Changes in light intensity directly affect the performance of the photosynthetic apparatus. Light energy absorbed in excess of cells' needs leads to production of reactive oxygen species and photo-oxidative damage. Excess light in both constant and dynamic environments induces photoprotective acclimation in plants. Distinct sets of signals and regulatory mechanisms are involved in acclimatory adjustment of photoprotection and photosynthesis under constant and dynamic (fluctuating) light conditions. We are still far away from drawing a comprehensive picture of acclimatory signal transduction pathways, particularly in dynamic environments...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27881274/performance-assessment-of-the-juaboso-district-office-of-the-national-health-insurance-authority
#16
Paul Effah, Kingsley Opoku Appiah, Patience Aseweh Abor
OBJECTIVES: To assess the performance of the National Health Insurance Authority (NHIA) in Ghana. METHODS: Using a thorough case study of the Juaboso District Office of the NHIA, this study assessed the community coverage rate, the annual expenditure and income, and the trend of claims payment for the period 2009 to 2012 as well as factors influencing the level of patronage of the National Health Insurance Scheme. A self-administered structured questionnaire was used to gather data from the management of the scheme...
September 2016: Value in Health Regional Issues
https://www.readbyqxmd.com/read/27881231/burkholderia-pseudomallei-%C3%AE-carbonic-anhydrase-is-strongly-activated-by-amino-acids-and-amines
#17
Daniela Vullo, Sonia Del Prete, Sameh M Osman, Zeid AlOthman, Clemente Capasso, William A Donald, Claudiu T Supuran
Activation of the γ-class carbonic anhydrase (CAs, EC 4.2.1.1) from the pathogenic bacterium Burkholderia pseudomallei (BpsγCA) with a series of natural and non-natural amino acids and aromatic/heterocyclic amines has been investigated. The best BpsγCA activators were d-His, l-DOPA, d-Trp, 4-amino-l-Phe, dopamine, 2-(2-aminoethyl)pyridine, 2-aminoethyl-piparazine/morpholine and l-adrenaline, which showed activation constants ranging between 9 and 86nM. The least effective activators were l-His, l-Phe and 2-pyridyl-methylamine, with KAs in the range of 1...
November 12, 2016: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/27878169/in-situ-characterisation-of-nanostructured-multiphase-thermoelectric-materials-at-elevated-temperatures
#18
S Aminorroaya Yamini, D R G Mitchell, M Avdeev
Multiphase thermoelectric materials have recently attracted considerable attention due to the high thermoelectric efficiencies which can be achieved in these compounds compared to their single-phase counterparts. However, there is very little known on the structural evolution of these phases as a function of temperature. In this work we performed an in situ high temperature structural characterisation of recently reported high efficiency p-type multiphase (PbTe)0.65(PbS)0.25(PbSe)0.1 compounds by hot stage transmission electron microscopy and high-resolution neutron powder diffraction...
November 23, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27878152/a-heptanuclear-light-harvesting-metal-based-antenna-dendrimer-with-six-ru-ii-based-chromophores-directly-powering-a-single-os-ii-based-energy-trap
#19
Emanuele La Mazza, Fausto Puntoriero, Francesco Nastasi, Baptiste Laramée-Milette, Garry S Hanan, Sebastiano Campagna
The novel dendritic-shaped, heptanuclear compound 1 - the first mixed Os-Ru dendrimer with tris-chelating bridging ligands - has been synthesized and its photophysics studied by fs pump-probe transient spectroscopy. In 1, all light energy absorbed by six identical Ru(ii) chromophores is funnelled to the luminescent central Os(ii) core, with a time constant of 11 ps, by Dexter energy transfer.
November 23, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27877867/electrical-and-photo-electrical-properties-of-mos2-nanosheets-with-and-without-an-al2o3-capping-layer-under-various-environmental-conditions
#20
Muhammad Farooq Khan, Ghazanfar Nazir, Volodymyr M Lermolenko, Jonghwa Eom
The electrical and photo-electrical properties of exfoliated MoS2 were investigated in the dark and in the presence of deep ultraviolet (DUV) light under various environmental conditions (vacuum, N2 gas, air, and O2 gas). We examined the effects of environmental gases on MoS2 flakes in the dark and after DUV illumination through Raman spectroscopy and found that DUV light induced red and blue shifts of peaks (E(1)2 g and A1 g) position in the presence of N2 and O2 gases, respectively. In the dark, the threshold voltage in the transfer characteristics of few-layer (FL) MoS2 field-effect transistors (FETs) remained almost the same in vacuum and N2 gas but shifted toward positive gate voltages in air or O2 gas because of the adsorption of oxygen atoms/molecules on the MoS2 surface...
2016: Science and Technology of Advanced Materials
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