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https://www.readbyqxmd.com/read/28732417/expanding-spectrum-and-diversifying-role-of-laser-beam-from-intraoperative-cranial-surgery-adjunct-to-magnetic-resonance-guided-minimally-invasive-thermal-laser-ablation-therapy-for-intracranial-tumor
#1
https://www.readbyqxmd.com/read/28732406/quantifying-deforestation-and-forest-degradation-with-thermal-response
#2
Hua Lin, Yajun Chen, Qinghai Song, Peili Fu, James Cleverly, Vincenzo Magliulo, Beverly E Law, Christopher M Gough, Lukas Hörtnagl, Filippo Di Gennaro, Giorgio Matteucci, Leonardo Montagnani, Pierpaolo Duce, Changliang Shao, Tomomichi Kato, Damien Bonal, Eugénie Paul-Limoges, Jason Beringer, John Grace, Zexin Fan
Deforestation and forest degradation cause the deterioration of resources and ecosystem services. However, there are still no operational indicators to measure forest status, especially for forest degradation. In the present study, we analysed the thermal response number (TRN, calculated by daily total net radiation divided by daily temperature range) of 163 sites including mature forest, disturbed forest, planted forest, shrubland, grassland, savanna vegetation and cropland. TRN generally increased with latitude, however the regression of TRN against latitude differed among vegetation types...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732401/can-brook-trout-survive-climate-change-in-large-rivers-if-it-rains
#3
Eric R Merriam, Rodrigo Fernandez, J Todd Petty, Nicolas Zegre
We provide an assessment of thermal characteristics and climate change vulnerability for brook trout (Salvelinus fontinalis) habitats in the upper Shavers Fork sub-watershed, West Virginia. Spatial and temporal (2001-2015) variability in observed summer (6/1-8/31) stream temperatures was quantified in 23 (9 tributary, 14 main-stem) reaches. We developed a mixed effects model to predict site-specific mean daily stream temperature from air temperature and discharge and coupled this model with a hydrologic model to predict future (2016-2100) changes in stream temperature under low (RCP 4...
July 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28732161/an-elegant-ph-responsive-nanovehicle-for-drug-delivery-based-on-triazine-dendrimer-modified-magnetic-nanoparticles
#4
Amir Landarani-Isfahani, Majid Moghadam, Shima Mohammadi, Maryam Royvaran, Naimeh Moshtael-Arani, Saghar Rezaei, Shahram Tangestaninejad, Valiollah Mirkhani, Iraj Mohammadpoor-Baltork
Owing to properties of magnetic nanoparticles and elegant three-dimensional macromolecule architectural features, dendrimeric structures have been investigated as nanoscale drug delivery systems. In this paper, a novel magnetic nanocarrier, generation two (G2) triazine dendrimer modified Fe3O4@SiO2 magnetic nanoparticles (MNP-G2), was designed, fabricated and characterized by Fourier transform infrared (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS)...
July 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28732117/identification-by-phenotypic-and-genetic-approaches-of-an-indigenous-saccharomyces-cerevisiae-wine-strain-with-high-desiccation-tolerance
#5
Marianna Zambuto, Rossana Romaniello, Nicoletta Guaragnella, Patrizia Romano, Sonia Votta, Angela Capece
During active dry yeast (ADY) production process, cells are exposed to multiple stresses, such as thermal, oxidative and hyperosmotic shock. Previously, by analyzing cells in exponential growth phase, we selected an indigenous Saccharomyces cerevisiae wine strain, namely CD-6Sc, for its higher tolerance to desiccation and higher expression of specific desiccation stress-related genes in comparison to other yeast strains. In this study, we performed a desiccation treatment on stationary phase cells by comparing the efficacy of two different methods: a "laboratory dry test" in a small-scale (mild stress) and a treatment by spray-drying (severe stress), one of the most appropriate preservation method for yeasts and other micro-organisms...
July 21, 2017: Yeast
https://www.readbyqxmd.com/read/28731774/femtosecond-spin-current-pulses-generated-by-the-nonthermal-spin-dependent-seebeck-effect-and-interacting-with-ferromagnets-in-spin-valves
#6
Alexandr Alekhin, Ilya Razdolski, Nikita Ilin, Jan P Meyburg, Detlef Diesing, Vladimir Roddatis, Ivan Rungger, Maria Stamenova, Stefano Sanvito, Uwe Bovensiepen, Alexey Melnikov
Using the sensitivity of optical second harmonic generation to currents, we demonstrate the generation of 250-fs long spin current pulses in Fe/Au/Fe/MgO(001) spin valves. The temporal profile of these pulses indicates ballistic transport of hot electrons across a sub-100 nm Au layer. The pulse duration is primarily determined by the thermalization time of laser-excited hot carriers in Fe. Considering the calculated spin-dependent Fe/Au interface transmittance we conclude that a nonthermal spin-dependent Seebeck effect is responsible for the generation of ultrashort spin current pulses...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731739/prethermalization-at-low-temperature-the-scent-of-long-range-order
#7
Vincenzo Alba, Maurizio Fagotti
Nonequilibrium time evolution in isolated many-body quantum systems generally results in thermalization. However, the relaxation process can be very slow, and quasistationary nonthermal plateaux are often observed at intermediate times. The paradigmatic example is a quantum quench in an integrable model with weak integrability breaking; for a long time, the state cannot escape the constraints imposed by the approximate integrability. We unveil a new mechanism of prethermalization, based on the presence of a symmetry of the prequench Hamiltonian, which is spontaneously broken at zero temperature and is explicitly broken by the postquench Hamiltonian...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731730/uhlmann-connection-in-fermionic-systems-undergoing-phase-transitions
#8
Bruno Mera, Chrysoula Vlachou, Nikola Paunković, Vítor R Vieira
We study the behavior of the Uhlmann connection in systems of fermions undergoing phase transitions. In particular, we analyze some of the paradigmatic cases of topological insulators and superconductors in one dimension, as well as the BCS theory of superconductivity in three dimensions. We show that the Uhlmann connection signals phase transitions in which the eigenbasis of the state of the system changes. Moreover, using the established fidelity approach and the study of the edge states, we show the absence of thermally driven phase transitions in the case of topological insulators and superconductors...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731722/dynamically-reconfigurable-metadevice-employing-nanostructured-phase-change-materials
#9
Zhihua Zhu, Philip Gareth Evans, Richard F Haglund, Jason Valentine
Mastering dynamic free-space spectral control and modulation in the near-infrared and optical regimes remains a challenging task that is hindered by the available functional materials at high frequencies. Here, we realize an efficient metadevice capable of spectral control by minimizing the thermal mass of a vanadium dioxide phase-change material (PCM) and placing the PCM at the feed gap of a bow-tie field antenna. The device has an experimentally measured tuning range up to 360 nm in the NIR and a modulation depth of 33% at the resonant wavelength...
July 21, 2017: Nano Letters
https://www.readbyqxmd.com/read/28731693/isolable-bis-triarylamine-dications-analogues-of-thiele-s-chichibabin-s-and-m%C3%A3-ller-s-hydrocarbons
#10
Gengwen Tan, Xinping Wang
Since the pioneering work by Thiele and Chichibabin, who synthesized the first diradicals bridged by phenylene and biphenylene groups in 1904 and 1907, respectively, numerous efforts have been devoted to synthesizing stable diradicals during the last few decades, and several strategies have been developed to stabilize these highly reactive diradicals. In this Account, we describe the synthesis and characterization of isolable bis(triarylamine) dications, nitrogen analogues of Thiele's, Chichibabin's, and Müller's hydrocarbons, which represent facilely accessible, stable diradicals by replacing carbinyl centers with isoelectronic aminium centers...
July 21, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28731681/the-first-n-borylated-emitters-displaying-highly-efficient-thermally-activated-delayed-fluorescence-and-high-performance-oleds
#11
Yi-Jyun Lien, Tzu-Chieh Lin, Chun-Chieh Yang, Yu-Cheng Chiang, Chih-Hao Chang, Shih-Hung Liu, Yi-Ting Chen, Gene-Hsiang Lee, Pi-Tai Chou, Chin-Wei Lu, Yun Chi
Despite the fast boom of thermally activated delayed fluorescence (TADF) emitters bearing borane-based acceptor, so far, none of TADF emitters with a direct B-N linkage between N-donor and boryl acceptor has been reported. The latter should simplify molecular architecture and hence facilitate the synthetic design and versatility. We report here the preparation and characterization of a new series of N-borylated compounds with functional acridine donor unit; namely: ACBM, PACBM and SACBM. Spectroscopic studies were performed to explore their photophysical properties that exhibited prominent solvatochromism and thermally activated delayed fluorescence...
July 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28731623/concentric-photothermal-coagulation-with-basket-integrated-optical-device-for-treatment-of-tracheal-stenosis
#12
Van Nam Tran, Hyungshin Lee, Van Gia Truong, Yun-Hee Rhee, Hyun Wook Kang
A basket-integrated optical device is developed to consistently treat tubular tissue by centering an optical diffuser in the lumen. Four nitinol arms in conjunction with the optical diffusing applicator are deployed to induce homogeneous circumferential light emission and concentric photothermal coagulation on tracheal tissue. 1470-nm laser light is employed for the tissue testing at various irradiation conditions and evaluated in terms of thermal gradient and temperature evolution. Preliminary experiments on liver tissue demonstrate the concentric development of the radial thermal coagulation in the tissue (eccentric ratio = ~5...
July 21, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28731618/controlling-the-near-infrared-transparency-of-costal-cartilage-by-impregnation-with-clearing-agents-and-magnetite-nanoparticles
#13
Yulia Alexandrovskaya, Kirill Sadovnikov, Andrey Sharov, Anna Sherstneva, Evgeniy Evtushenko, Alexander Omelchenko, Mariya Obrezkova, Valery Tuchin, Valery Lunin, Emil Sobol
Penetration depth of near infrared laser radiation to costal cartilage is controlled by the tissue absorption and scattering and it is the critical parameter to provide the relaxation of mechanical stress throughout the whole thickness of cartilage implant. To enhance the penetration for the laser radiation on 1.56 μm the optical clearing solutions of glycerol and fructose of various concentrations are tested. The effective and reversible tissue clearance was achieved. However, the increasing absorption of radiation should be concerned: 5-8(ᴼ) C increase of tissue temperature was detected...
July 21, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28731569/diversity-in-thermal-affinity-among-key-piscivores-buffers-impacts-of-ocean-warming-on-predator-prey-interactions
#14
Rebecca L Selden, Ryan D Batt, Vincent S Saba, Malin L Pinsky
Asymmetries in responses to climate change have the potential to alter important predator-prey interactions, in part by altering the location and size of spatial refugia for prey. We evaluated the effect of ocean warming on interactions between four important piscivores and four of their prey in the U.S. Northeast Shelf by examining species overlap under historical conditions (1968-2014) and with a doubling in CO2 . Because both predator and prey shift their distributions in response to changing ocean conditions, the net impact of warming or cooling on predator-prey interactions was not determined a priori from the range extent of either predator or prey alone...
July 21, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28731486/demineralized-dentin-and-enamel-matrices-as-suitable-substrates-for-bone-regeneration
#15
Nina Bono, Paolo Tarsini, Gabriele Candiani
BACKGROUND: In recent decades, tooth derivatives such as dentin (D) and enamel (E) have been considered as potential graft biomaterials to treat bone defects. This study aimed to investigate the effects of demineralization on the physical-chemical and biological behavior of D and E. METHODS: Human D and E were minced into particles (Ø<1 mm), demineralized and sterilized. Thorough physical-chemical and biochemical characterizations of native and demineralized materials were performed by SEM and EDS analysis and ELISA kits to determine mineral, collagen type I and BMP-2 contents...
July 20, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28731426/ultrahigh-electrical-and-thermal-conductive-hydroxylated-graphene-based-flexible-carbon-film
#16
Jiheng Ding, Obaid Ur Rahman, Hongran Zhao, Wanjun Peng, Huimin Dou, Hao Chen, Haibin Yu
Graphene based films are widely used in the electronics industry. Present work report surface hydroxylated graphene sheets (HGS) from natural graphite by a rapid and efficient molten hydroxide-assisted exfoliated technique. This method enable preparation of a flexible carbon film from exfoliated graphene with extraodinary production yield (~100%), high electrical (11.5×104 S. m-1) and thermal conductivity (1842 W m-1K -1) withbetter dispersion concentration (~10.0 mg mL-1). As a result, this method is expected to applied for the preparation of large-scale, high-quality and low-cost electrical and thermal conductive graphene based material...
July 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28731364/synthesis-of-a-new-insulin-mimetic-anti-diabetic-drug-containing-vitamin-a-and-vanadium-iv-salt-chemico-biological-characterizations
#17
Abdel Majid A Adam, Ahmed M Naglah, Mohamed A Al-Omar, Moamen S Refat
Diabetes patients suffer from chronic disorders in the metabolism due to high blood sugar caused by anomalies in insulin excretion. Recently, vanadium compounds have been prepared and functionalized to decrease the level of hyperglycemia. Vitamin A boosts beta cell activity; therefore, the lack of this vitamin plays a role in the development of type 2 diabetes. The aim of this article focused on the synthesis of a new anti-diabetic drug formed from the complexation of a vanadium(IV) salt with vitamin A. Vitamin A acts as a unidentate chelate through the oxygen of its -OH group...
July 1, 2017: International Journal of Immunopathology and Pharmacology
https://www.readbyqxmd.com/read/28731272/short-term-toxicity-of-1-methylnaphthalene-to-americamysis-bahia-and-five-deep-sea-crustaceans
#18
Anthony Knap, Nicholas R Turner, Gopal Bera, D Abigail Renegar, Tamara Frank, Jose Sericano, Bernhard M Riegl
There are few studies that have evaluated hydrocarbon toxicity to vertically migrating deep-sea micronekton. Crustaceans were collected alive using a 9 m(2) Tucker trawl with a thermally insulated cod end and returned to the laboratory in 10 °C seawater. Toxicity of the polycyclic aromatic hydrocarbon 1-methylnapthalene to Americamysis bahia, Janicella spinacauda, Systellaspis debilis, Sergestes sp., Sergia sp., and a euphausid sp. was assessed in a constant exposure toxicity test utilizing a novel passive dosing toxicity testing protocol...
July 21, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28731261/structural-insights-for-the-borates-with-anion-templated-open-framework-configuration-asymmetric-k2bab16o26-vs-centrosymmetric-k3csb20o32-and-na2m2nb18o30-m-rb-cs-n-ba-pb
#19
Miriding Mutailipu, Min Zhang, Xin Su, Zhihua Yang, Yanna Chen, Shilie Pan
Five new mixed-metal borates, namely, K2BaB16O26, K3CsB20O32, Na2Cs2BaB18O30, Na2Rb2PbB18O30, and Na2Cs2PbB18O30 were synthesized using the high-temperature solution method. Those structures were characterized by single-crystal X-ray diffraction, and the B-O configurations of them are shown to feature complicated three-dimensional (3D) open-framework structures with different types of channels. For all the five compounds, the frameworks can be reduced into four-connected (4-c) uninodal net with sra-, dia- and nbo-type topology by assigning the [B5O10]5- and [B3O7]5- clusters as basic nodes...
July 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28731224/extremely-low-density-and-super-compressible-graphene-cellular-materials
#20
Ling Qiu, Bing Huang, Zijun He, Yuanyuan Wang, Zhiming Tian, Jefferson Zhe Liu, Kun Wang, Jingchao Song, Thomas R Gengenbach, Dan Li
Development of extremely low density graphene elastomer (GE) holds the potential to enable new properties that traditional cellular materials cannot offer, which are promising for a range of emerging applications, ranging from flexible electronics to multifunctional scaffolds. However, existing graphene foams with extremely low density are generally found to have very poor mechanical resilience. It is scientifically intriguing but remains unresolved whether and how the density limit of this class of cellular materials can be further pushed down while their mechanical resilience is being retained...
July 21, 2017: Advanced Materials
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