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https://www.readbyqxmd.com/read/29778815/photodegradation-of-atrazine-in-the-presence-of-indole-3-acetic-acid-and-natural-montmorillonite-clay-minerals
#1
Lin Zhang, Haoting Tian, Ran Hong, Chao Wang, Yi Wang, Anping Peng, Cheng Gu
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) is a commonly used agricultural herbicide that, as a result, is frequently detected in surface and ground water. In this study, we provide evidence of the photo-oxidation of atrazine under environmentally relevant conditions, specifically, in the presence of natural montmorillonite clay and the ubiquitous phytohormone indole-3-acetic acid (IAA). The reaction is initiated by the generation of hydrated electrons from the photo-ionization of IAA. These electrons react with protons and dissolved oxygen to form hydroxyl radicals, which promote the further degradation of atrazine...
May 17, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29778705/investigating-the-coumarin-capability-in-chalcogenide-20ti-2-se-80pr-2-se-3-system-based-photovoltaics
#2
M Soylu, A Dere, C Ahmedova, G Barim, Abdullah G Al-Sehemi, Ahmed A Al-Ghamdi, W A Farooq, F Yakuphanoglu
Chalcogenide films containing various contents of coumarin (CO) are deposited on the p-type Si substrates. Al/coumarin doped chalcogenide films/p-Si contact exhibits a rectifying behavior. The electrical and photoresponse properties of the prepared diodes are characterized by current and capacitance measurements under various illumination intensities. The addition of coumarin to TI2 Se-Pr2 Se3 significantly affects the characteristic parameters of diodes. Kohlrausch function is used as an appropriate way to obtain the photo charge density (ρph ) and the relaxation time constant from the photocurrent/capacitance transients...
May 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29778134/central-serous-chorioretinopathy-in-african-americans-at-wilmer-eye-institute
#3
Pooja H Mehta, Jay Chhablani, Jiangxia Wang, Catherine B Meyerle
OBJECTIVE: To evaluate the frequency of central serous chorioretinopathy (CSC) in African Americans/blacks within an academic center in a predominantly African American city, as the current belief is that CSC is rare in this population. METHODS: A retrospective review of all patients' charts diagnosed with CSC at Wilmer Eye Institute/Johns Hopkins University from August 2009-August 2015 was conducted via an electronic health record search (EPIC). The charts were categorized by self-reported race and gender...
June 2018: Journal of the National Medical Association
https://www.readbyqxmd.com/read/29777957/dual-ph-reduction-responsive-hybrid-polymeric-micelles-for-targeted-chemo-photothermal-combination-therapy
#4
Linhua Zhang, Yu Qin, Zhiming Zhang, Fan Fan, Chenlu Huang, Li Lu, Hai Wang, Xu Jin, Hanxue Zhao, Deling Kong, Chun Wang, Hongfan Sun, Xigang Leng, Dunwan Zhu
The combination of chemotherapy and photothermal therapy in multifunctional nanovesicles has emerged as a promising strategy to improve cancer therapeutic efficacy. Herein, we designed new pH/reduction dual-responsive and folate decorated polymeric micelles (FA Co-PMs) as theranostic nanocarrier to co-encapsulate doxorubicin (DOX) and indocyanine green (ICG) for targeted NIR imaging and chemo-photothermal combination therapy. The Co-PMs exhibited nano-sized structure (∼100 nm) with good monodispersity, high encapsulation efficiency of both ICG and DOX, triggered DOX release in response to acid pH and reduction environment, and excellent temperature conversion with laser irradiation...
May 16, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29777157/transient-metal-centered-states-mediate-isomerization-of-a-photochromic-ruthenium-sulfoxide-complex
#5
Amy A Cordones, Jae Hyuk Lee, Kiryong Hong, Hana Cho, Komal Garg, Martial Boggio-Pasqua, Jeffrey J Rack, Nils Huse, Robert W Schoenlein, Tae Kyu Kim
Ultrafast isomerization reactions underpin many processes in (bio)chemical systems and molecular materials. Understanding the coupled evolution of atomic and molecular structure during isomerization is paramount for control and rational design in molecular science. Here we report transient X-ray absorption studies of the photo-induced linkage isomerization of a Ru-based photochromic molecule. X-ray spectra reveal the spin and valence charge of the Ru atom and provide experimental evidence that metal-centered excited states mediate isomerization...
May 18, 2018: Nature Communications
https://www.readbyqxmd.com/read/29775585/an-optogenetic-platform-for-real-time-single-cell-interrogation-of-stochastic-transcriptional-regulation
#6
Marc Rullan, Dirk Benzinger, Gregor W Schmidt, Andreas Milias-Argeitis, Mustafa Khammash
Transcription is a highly regulated and inherently stochastic process. The complexity of signal transduction and gene regulation makes it challenging to analyze how the dynamic activity of transcriptional regulators affects stochastic transcription. By combining a fast-acting, photo-regulatable transcription factor with nascent RNA quantification in live cells and an experimental setup for precise spatiotemporal delivery of light inputs, we constructed a platform for the real-time, single-cell interrogation of transcription in Saccharomyces cerevisiae...
May 17, 2018: Molecular Cell
https://www.readbyqxmd.com/read/29775466/perception-of-aesthetics-and-personality-traits-in-orthognathic-surgery-patients-a-comparison-of-still-and-moving-images
#7
Klaus Sinko, Ulrich S Tran, Arno Wutzl, Rudolf Seemann, Gabriele Millesi, Reinhold Jagsch
It is common in practicing orthognathic surgery to evaluate faces with retruded or protruded chins (dysgnathic faces) using photographs. Because motion may alter how the face is perceived, we investigated the perception of faces presented via photographs and videos. Two hundred naïve raters (lay persons, without maxillo facial surgery background) evaluated 12 subjects with varying chin anatomy [so-called skeletal Class I (normal chin), Class II (retruded chin), and Class III (protruded chin)]. Starting from eight traits, with Factor analysis we found a two-Factor solution, i...
2018: PloS One
https://www.readbyqxmd.com/read/29774883/-properties-of-decellularized-rabbit-carotid-artery-with-two-different-cross-linked-technologies-a-comparative-study
#8
Lei Huang, Feng Kuang, Demiao Kong, Xinmin Zhou
To compare the properties between decellularized rabbit carotid artery with different cross-linked technologies.
 Methods: The decellularized rabbit carotid arteries were randomly divided into a photo-oxidation group and a procyanidins group. One group was cross-linked with photo-oxidation and the other group was cross-linked with procyanidins. The in vitro or in vivo properties of the two groups were evaluated by testing heat-shrinking temperature, max tensile strength and the max elongation or by testing tissue structure, inflammatory reaction and calcification degree...
April 28, 2018: Zhong Nan da Xue Xue Bao. Yi Xue Ban, Journal of Central South University. Medical Sciences
https://www.readbyqxmd.com/read/29774637/potassium-octatitanate-fibers-induce-persistent-lung-and-pleural-injury-and-are-possibly-carcinogenic-in-male-fischer-344-rats
#9
Mohamed Abdelgied, Ahmed M El-Gazzar, David B Alexander, William T Alexander, Takamasa Numano, Masaaki Iigou, Aya Naiki-Ito, Hirotsugu Takase, Khaled Abbas Abdou, Akihiko Hirose, Yuhji Taquahashi, Jun Kanno, Hiroyuki Tsuda, Satoru Takahashi
Potassium octatitanate fibers (K2 O•8TiO2 , POT fibers) are widely used as an alternative to asbestos. We investigated the pulmonary and pleural toxicity of POT fibers with reference to 2 non-fibrous titanium dioxide nanoparticles (nTiO2 ), photo-reactive anatase (a-nTiO2 ) and inert rutile (r-nTiO2 ). Ten-week old male F344 rats were administered 0.5 ml of 250-μg/ml suspensions of POT fibers, a-nTiO2 , or r-nTiO2 , eight times (1 mg/rat) over a 15 day period by trans-tracheal intrapulmonary spraying (TIPS)...
May 17, 2018: Cancer Science
https://www.readbyqxmd.com/read/29774352/a-novel-efficient-g-c-3-n-4-bioi-p-n-heterojunction-photocatalyst-constructed-through-the-assembly-of-g-c-3-n-4-nanoparticles
#10
Zengyu You, Chenyan Wu, Qianhong Shen, Yang Yu, Hao Chen, Yuxuan Su, Hui Wang, Chunchun Wu, Fang Zhang, Hui Yang
An efficient and facile method to fabricate a surficial dispersive heterojunction based on the assembly of g-C3N4 nanoparticles was proposed. A p-n nano heterojunction composed of BiOI and g-C3N4 was constructed by simply loading g-C3N4 nanoparticles on flower-like BiOI nanosheets. The structure-dependent optical, electronic and photoelectric properties were investigated, and the structure-property relationship was discussed. The results show that the g-C3N4 nanoparticles are uniformly loaded on the surface of BiOI nanosheets and thus form a p-n heterojunction with an intimate interface...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29774329/syntheses-and-studies-of-electron-energy-transfer-of-new-dyads-based-on-an-unsymmetrical-perylene-diimide-incorporating-chelating-1-10-phenanthroline-and-its-corresponding-square-planar-complexes-with-dichloroplatinum-ii-and-dichloropalladium-ii
#11
Sebile Işık Büyükekşi, Ahmet Karatay, Nursel Acar, Betül Küçüköz, Ayhan Elmali, Abdurrahman Şengül
Perylene diimides (PDIs) are among the most versatile and functional dyes for supramolecular structures displaying characteristic high absorptions and photo-luminescence properties as the prerequisite for optoelectronic thin film devices. Despite intense investigations into these semi-conducting and electro-active materials, details of their electronic structure are still under examination. In particular, non-planar twisted PDIs as an electron acceptor is a promising model system for efficient charge generation and transport processes...
May 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29774063/dual-target-gene-therapy-to-eml4-alk-nsclc-by-a-gold-nanoshell-based-system
#12
Siwen Li, Yuxi Liu, Yalan Rui, Liping Tang, Samuel Achilefu, Yueqing Gu
Although EML4-ALK transforming fusion gene is represented in only 8% of non-small cell lung cancer (NSCLC) cases, its expression is partly responsive for the failure of current NSCLC treatments. Preventing secondary mutation of the ALK protein through direct gene manipulation could overcome NSCLC drug resistance. Method: In this study, we developed a gold nanoshell (HAuNs) drug carrier for delivery and selective photo-thermal release of genes that target ALK and microRNA-301 in NSCLC. Additionally, the densely-coated nanoshell adsorbed high amounts of the positively-charged anticancer drug doxorubicin (DOX), generating an exciting multidimensional treatment strategy that includes gene-, thermal- and chemo- therapy...
2018: Theranostics
https://www.readbyqxmd.com/read/29773887/varacin-1-a-novel-analog-of-varacin-c-induces-p53-independent-apoptosis-in-cancer-cells-through-ros-mediated-reduction-of-xiap
#13
Jing Zhou, Wen-Li Li, Zi-Xuan Wang, Nai-Yuan Chen, Yue Tang, Xiao-Xiao Hu, Jing-Huan Deng, Yixin Lu, Guo-Dong Lu
Varacin C is a promising anticancer agent and possesses acid-promoted and photo-induced DNA-damaging activities. In this study, we synthesized an analog varacin-1 (VCA-1) and examined its anticancer potentials. The results demonstrated that VCA-1 caused dose-dependent apoptotic cell death in cancer cells. Note that this action is independent of p53 status, because VCA-1 induced similar levels of apoptosis in two different panels of cell lines (HCT116 p53- wild-type vs. HCT116 p53-knockout colon cancer cells, and p53-expressing U2OS vs...
May 17, 2018: Acta Pharmacologica Sinica
https://www.readbyqxmd.com/read/29773798/probing-femtosecond-lattice-displacement-upon-photo-carrier-generation-in-lead-halide-perovskite
#14
Giovanni Batignani, Giuseppe Fumero, Ajay Ram Srimath Kandada, Giulio Cerullo, Marina Gandini, Carino Ferrante, Annamaria Petrozza, Tullio Scopigno
Electronic properties and lattice vibrations are expected to be strongly correlated in metal-halide perovskites, due to the soft fluctuating nature of their crystal lattice. Thus, unveiling electron-phonon coupling dynamics upon ultrafast photoexcitation is necessary for understanding the optoelectronic behavior of the semiconductor. Here, we use impulsive vibrational spectroscopy to reveal vibrational modes of methylammonium lead-bromide perovskite under electronically resonant and non-resonant conditions...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773787/iodine-catalyzed-diazo-activation-to-access-radical-reactivity
#15
Pan Li, Jingjing Zhao, Lijun Shi, Jin Wang, Xiaodong Shi, Fuwei Li
Transition-metal-catalyzed diazo activation is a classical way to generate metal carbene, which are valuable intermediates in synthetic organic chemistry. An alternative iodine-catalyzed diazo activation is disclosed herein under either photo-initiated or thermal-initiated conditions, which represents an approach to enable carbene radical reactivity. This metal-free diazo activation strategy were successfully applied into olefin cyclopropanation and epoxidation, and applying this method to pyrrole synthesis under thermal-initiated conditions further demonstrates the unique reactivity using this method over typical metal-catalyzed conditions...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29773509/the-role-of-the-inferior-frontal-gyrus-in-vicarious-social-touch-a-transcranial-direct-current-stimulation-tdcs-study
#16
Leehe Peled-Avron, Laura Glasner, Hila Z Gvirts, Simone G Shamay-Tsoory
The neural mechanisms facilitating the experience of vicarious social touch are largely unknown. The right inferior frontal gyrus (rIFG) has been suggested as part of a simulation observation-execution neural network that plays a key role in the perception of tactile stimuli. Considering that vicarious social touch involves vicarious sharing of emotions, we hypothesized that emotional empathy, i.e., the ability to feel what another individual is feeling, modulates the neural responses to vicarious touch. To examine the role of the rIFG in vicarious touch and its modulation by levels of emotional empathy, we used anodal transcranial direct current stimulation (tDCS) on forty participants who observed photos depicting social touch, nonsocial touch or no touch during tDCS or sham stimulation...
April 30, 2018: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29772693/facile-synthesis-of-magnetic-photocatalyst-ag-bivo%C3%A2-mn-1-x-zn-x-fe%C3%A2-o%C3%A2-and-its-highly-visible-light-driven-photocatalytic-activity
#17
Taiping Xie, Hui Li, Chenglun Liu, Longjun Xu
Ag/BiVO₄/Mn1-x Znx Fe₂O₄ was synthesized with a dip-calcination in situ synthesis method. This work was hoped to provide a simple method to synthesis three-phase composite. The phase structure, optical properties and magnetic feature were confirmed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS), and vibrating sample magnetometer (VSM)...
May 16, 2018: Materials
https://www.readbyqxmd.com/read/29772564/impact-of-estrogen-and-photoperiod-on-arginine-vasotocin-and-vt3-receptor-expression-in-the-shell-gland-of-quail
#18
Rashmi Srivastava, Lawrence E Cornett, Chandra Mohini Chaturvedi
Role of estrogen and photoperiod is well-established in avian reproduction. In addition, the distribution and the expression of arginine vasotocin (AVT) and its receptor VT3 to ensure reproductive/breeding conditions in Japanese quail influenced by them has been the main focus of this review. To consider this aspect the mRNA expression of VT3 receptor and its ligand AVT in the shell gland has been emphasized. In birds, AVT performs a dual role as an anti-diuretic hormone and the functions accomplished by oxytocin in mammals...
June 1, 2018: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/29772175/systematic-excited-state-studies-of-reversibly-switchable-fluorescent-proteins
#19
Daryna Smyrnova, María Del Carmen Marín, Massimo Olivucci, Arnout Ceulemans
A set formed by five reversibly-switchable fluorescent proteins (RSFPs) display spread over 40~nm in absorption maxima and only 18~nm in emission. The five proteins -- Dronpa, rsFastLime, rsKame, Padron(anionic form) and bsDronpa -- carry exactly the same chromophore and differ just in a few mutations. Thus they form an ideal set for mechanistic investigation. Starting with the results of molecular dynamics simulations we use QM/MM calculations to investigate the effects controlling the spectral tuning . In this contribution we show that the models, which are based on CASPT2//CASSCF level of QM theory, reproduce the observed absorption trend with only a limited blue-shift of 4...
May 17, 2018: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/29772171/motion-control-and-optical-interrogation-of-a-levitating-single-nv-in-vacuum
#20
Gerard Planes Conangla, Andreas W Schell, Raul A Rica, Romain Quidant
Levitation optomechanics exploits the unique mechanical properties of trapped nano-objects in vacuum in order to address some of the limitations of clamped nanomechanical resonators. In particular, its performance is foreseen to contribute to a better understanding of quantum decoherence at the mesoscopic scale as well as to lead to novel ultra-sensitive sensing schemes. While most efforts have so far focused on optical trapping of low absorbing silica particles, further opportunities arise from levitating objects with internal degrees of freedom like color centers...
May 17, 2018: Nano Letters
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