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https://www.readbyqxmd.com/read/29141118/pbs-cds-core-shell-qds-suppress-charge-transfer-and-enhance-triplet-transfer
#1
Zhiyuan Huang, Zihao Xu, Melika Mahboub, Xin Li, Jordan Taylor, Hill Harman, Tianquan Lian, MingLee Tang
Here, we observe that a sub-monolayer CdS shell on PbS quantum dots (QDs) enhances triplet energy transfer (TET) by suppressing competitive charge transfer from QDs to molecules. The CdS shell increases the linear photon upconversion quantum yield (QY) from 3.5% for PbS QDs to 5.0% for PbS/CdS QDs when functionalized with a tetracene acceptor, 5-CT. While transient absorption spectroscopy reveals that both PbS and PbS/CdS QDs show the formation of the 5-CT triplet (with rate constants of 5.91 ±0.60 ns-1 and 1...
November 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29140712/high-expression-of-ugt1a1-1a6-in-monkey-small-intestine-comparison-of-protein-expression-levels-of-cytochromes-p450-udp-glucuronosyltransferases-and-transporters-in-small-intestine-of-cynomolgus-monkey-and-human
#2
Takanori Akazawa, Yasuo Uchida, Eisuke Miyauchi, Masanori Tachikawa, Sumio Ohtsuki, Tetsuya Terasaki
Cynomolgus monkeys have been widely used for the prediction of drug absorption in humans. The purpose of this study was to clarify the regional protein expression levels of cytochromes P450 (CYPs), UDP-glucuronosyltransferases (UGTs), and transporters in small intestine of cynomolgus monkey using liquid chromatography-tandem mass spectrometry, and to compare them with the corresponding levels in human. UGT1A1 in jejunum and ileum were >4.57- and >3.11-fold, and UGT1A6 in jejunum and ileum were >16...
November 15, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29140684/janus-gold-nanoplatform-for-synergetic-chemoradiotherapy-and-computed-tomography-imaging-of-hepatocellular-carcinoma
#3
Zheng Wang, Dan Shao, Zhimin Chang, Mengmeng Lu, Yingshuai Wang, Juan Yue, Dian Yang, Mingqiang Li, Qiaobing Xu, Wenfei Dong
There is a pressing need to develop nanoplatforms that integrate multimodal therapeutics to improve treatment responses and prolong the survival of patients with unresectable hepatocellular carcinoma (HCC). Mesoporous silica-coated gold nanomaterials have emerged as a novel multifunctional platform combining tunable surface plasmon resonance and mesoporous properties that exhibit multimodality properties in cancer theranostics. However, their reduced radiation-absorption efficiency and limited surface area hinder their further radiochemotherapeutic applications...
November 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/29140511/two-fatal-cases-involving-cardiovascular-drugs-diltiazem-and-amlodipine
#4
Luca Morini, Matteo Moretti, Francesca Brandolini, Antonio Marco Maria Osculati, Angelo Groppi, Claudia Vignali
A liquid chromatographic tandem mass spectrometric method for the identification and quantification of 18 cardiovascular drugs was developed in order to evaluate two cases of fatal intoxication involving diltiazem and amlodipine respectively. Samples were simply diluted and centrifuged using a three-steps procedure with methanol, acetonitrile and mobile phase. The method proved to be selective and all the validation parameters fulfilled the acceptance criteria. In particular, linearity was studied in the range limits of quantitation (LOQ)-1,000 ng/mL (LOQ ranging from 0...
November 13, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/29140343/passively-q-switched-pr-ylf-laser-with-a-co-2-mgal2o4-saturable-absorber
#5
Maxim Demesh, Daniel-Timo Marzahl, Anatol Yasukevich, Viktor Kisel, Günter Huber, Nikolay Kuleshov, Christian Kränkel
We report on a 2ω-OPSL-pumped passively Q-switched Pr(3+):LiYF4 laser operating at the wavelengths of 523, 607, and 640 nm. For this, we utilized a Co(2+)-doped MgAl2O4 (MALO) crystal as a saturable absorber in the visible range for the first time, to the best of our knowledge. In the green spectral region, the pulse duration was 210 ns with a pulse energy of 3.6 μJ and a repetition rate of 125 kHz. The minimum pulse duration of 87 ns at the highest pulse energy of 8.6 μJ was obtained at a repetition rate of 110 kHz at 607 nm...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140289/cats-and-carbohydrates-the-carnivore-fantasy
#6
REVIEW
Adronie Verbrugghe, Myriam Hesta
The domestic cat's wild ancestors are obligate carnivores that consume prey containing only minimal amounts of carbohydrates. Evolutionary events adapted the cat's metabolism and physiology to this diet strictly composed of animal tissues and led to unique digestive and metabolic peculiarities of carbohydrate metabolism. The domestic cat still closely resembles its wild ancestor. Although the carnivore connection of domestic cats is well recognised, little is known about the precise nutrient profile to which the digestive physiology and metabolism of the cat have adapted throughout evolution...
November 15, 2017: Veterinary Sciences
https://www.readbyqxmd.com/read/29140287/interaction-between-diethyldithiocarbamate-and-cu-ii-on-gold-in-non-cyanide-wastewater
#7
Nguyễn Hoàng Ly, Thanh Danh Nguyen, Kyung-Duk Zoh, Sang-Woo Joo
A surface-enhanced Raman scattering (SERS) detection method for environmental copper ions (Cu(2+)) was developed according to the vibrational spectral change of diethyldithiocarbamate (DDTC) on gold nanoparticles (AuNPs). The ultraviolet-visible (UV-Vis) absorption spectra indicated that DDTC formed a complex with Cu(2+), showing a prominent peak at ~450 nm. We found Raman spectral changes in DDTC from ~1490 cm(-1) to ~1504 cm(-1) on AuNPs at a high concentration of Cu(2+) above 1 μM. The other ions of Zn(2+), Pb(2+), Ni(2+), NH₄⁺, Mn(2+), Mg(2+), K⁺, Hg(2+), Fe(2+), Fe(3+), Cr(3+), Co(2+), Cd(2+), and Ca(2+) did not produce such spectral changes, even after they reacted with DDTC...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29140268/electrochemical-and-infrared-absorption-spectroscopy-detection-of-sf%C3%A2-decomposition-products
#8
Ming Dong, Chongxing Zhang, Ming Ren, Ricardo Albarracín, Rixin Ye
Sulfur hexafluoride (SF₆) gas-insulated electrical equipment is widely used in high-voltage (HV) and extra-high-voltage (EHV) power systems. Partial discharge (PD) and local heating can occur in the electrical equipment because of insulation faults, which results in SF₆ decomposition and ultimately generates several types of decomposition products. These SF₆ decomposition products can be qualitatively and quantitatively detected with relevant detection methods, and such detection contributes to diagnosing the internal faults and evaluating the security risks of the equipment...
November 15, 2017: Sensors
https://www.readbyqxmd.com/read/29140088/symmetrical-and-nonsymmetrical-meso-meso-directly-linked-hydroporphyrin-dyads-synthesis-and-photochemical-properties
#9
Nopondo N Esemoto, Andrius Satraitis, Linda Wiratan, Marcin Ptaszek
A series of a rigid meso-meso directly linked chlorin-chlorin, chlorin-bacteriochlorin, and bacteriochlorin-bacteriochlorin dyads, including free bases as well as Zn(II), Pd(II), and Cu(II) complexes, has been synthesized, and their absorption, emission, singlet oxygen ((1)O2) photosensitization, and electronic properties have been examined. Marked bathochromic shifts of the long-wavelength Qy absorption band and increase in fluorescence quantum yields in dyads, in comparison to the corresponding monomers, are observed...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29140085/electronic-structure-of-anilinopyridinate-supported-ru2-5-paddlewheel-compounds
#10
Amanda R Corcos, Michael D Roy, Michelle M Killian, Stephanie Dillon, Thomas C Brunold, John F Berry
The electronic structures of the diruthenium compounds Ru2(ap)4Cl (1, ap = 2-anilinopyridinate) and Ru2(ap)4OTf (2) were investigated with UV-vis, resonance Raman, and magnetic circular dichroism (MCD) spectroscopies; SQUID magnetometry; and density functional theory (DFT) calculations. Both compounds have quartet spin ground states with large axial zero-field splitting of ∼60 cm(-1) that is characteristic of Ru2(5+) compounds having a (π*, δ*)(3) electron configuration and a Ru-Ru bond order of ∼2.5...
November 15, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/29140068/arginine-rich-peptide-induced-supramolecular-self-assembly-of-water-soluble-anionic-alkynylplatinum-ii-complexes-a-continuous-and-label-free-luminescence-assay-for-trypsin-and-inhibitor-screening
#11
Angela Sin-Yee Law, Margaret Ching-Lam Yeung, Vivian Wing-Wah Yam
A water-soluble anionic alkynylplatinum(II) 2,6-bis(benzimidazol-2'-yl)pyridine (bzimpy) complex has been strategically designed and synthesized to show supramolecular self-assembly with cationic arginine-rich peptides through unique noncovalent Pt(II)···Pt(II) and π-π stacking interactions. Upon introduction of trypsin, the arginine-rich peptides can be hydrolyzed into small fragments and deaggregation of the platinum(II) complex molecules is observed. The aggregation-deaggregation process has been probed by UV-vis absorption, emission, and resonance light scattering (RLS) studies...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139513/current-knowledge-of-intestinal-absorption-of-bioactive-peptides
#12
REVIEW
Weilin Shen, Toshiro Matsui
Peptides have been demonstrated as potentially beneficial compounds against several life-style related diseases such as hypertension, hypercholesterolemia, and atherosclerosis, among others. However, limited research has been carried out on peptide absorption, resulting in a lack of understanding and control of this process. Therefore, this review discusses the recent insights gathered on in vitro and in vivo absorption of peptides across intestinal membranes, into blood circulation. Briefly, some di-/tripeptides permeate through intestinal membranes in their intact forms via peptide transporter systems, while others are vulnerable to protease degradation...
November 15, 2017: Food & Function
https://www.readbyqxmd.com/read/29139512/bright-type-ii-photoluminescence-from-mn-doped-cds-znse-zns-quantum-dots-with-mn-2-ions-as-exciton-couplers
#13
Ruilin Xu, Chen Liao, Yanqing Xu, Chunfeng Zhang, Min Xiao, Lei Zhang, Changgui Lu, Yiping Cui, Jiayu Zhang
Mn(2+) ions were introduced as exciton couplers to enhance the quantum yield (QY) of type-II photoluminescence (PL) from CdS/ZnSe/ZnS quantum dots (QDs) with slow hot-exciton cooling and low radiative rate. Transient absorption spectroscopy verifies the faster bleach recovery and faster peak red-shifting at the charge-transfer state. And the transient PL peak of the QDs changes from blue-shifting to red-shifting due to Mn(2+) doping. The QY of type-II PL can be enhanced from ∼35% to ∼60% by Mn(2+) doping...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29139509/nexafs-spectroscopy-of-ionic-liquids-experiments-versus-calculations
#14
Richard M Fogarty, Richard P Matthews, Matthew T Clough, Claire R Ashworth, Agnieszka Brandt-Talbot, Paul J Corbett, Robert G Palgrave, Richard A Bourne, Thomas W Chamberlain, Tom Vander Hoogerstraete, Paul B J Thompson, Patricia A Hunt, Nicholas A Besley, Kevin R J Lovelock
Experimental near edge X-ray absorption fine structure (NEXAFS) spectra are reported for 12 ionic liquids (ILs) encompassing a range of chemical structures for both the sulfur 1s and nitrogen 1s edges and compared with time-dependent density functional theory (TD-DFT) calculations. The energy scales for the experimental data were carefully calibrated against literature data. Gas phase calculations were performed on lone ions, ion pairs and ion pair dimers, with a wide range of ion pair conformers considered...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29139504/thionated-naphthalene-diimides-tuneable-chromophores-for-applications-in-photoactive-dyads
#15
Nicholas Pearce, E Stephen Davies, Raphael Horvath, Constance R Pfeiffer, Xue-Zhong Sun, William Lewis, Jonathan McMaster, Michael W George, Neil R Champness
Varying the degree of thionation of a series of naphthalene diimide (NDI) and naphthalic imide (NI) phenothiazine dyad systems affords a systematic approach for tuning the system's donor-acceptor energy gap. Each dyad was compared to model NDI/NI systems and fully characterised through single crystal X-ray diffraction, NMR, cyclic voltammetry, electron paramagnetic resonance (EPR), transient absorption spectroscopy (TA), time-resolved infra-red spectroscopy (TRIR) and DFT. The measurements reveal that thionation increases both electron affinity of the NDI/NI acceptor dyad component and accessibility of the singly or doubly reduced states...
November 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29139480/position-paper-the-potential-role-of-optical-biopsy-in-the-study-and-diagnosis-of-environmental-enteric-dysfunction
#16
REVIEW
Alex J Thompson, Michael Hughes, Salzitsa Anastasova, Laurie S Conklin, Tudor Thomas, Cadman Leggett, William A Faubion, Thomas J Miller, Peter Delaney, François Lacombe, Sacha Loiseau, Alexander Meining, Rebecca Richards-Kortum, Guillermo J Tearney, Paul Kelly, Guang-Zhong Yang
Environmental enteric dysfunction (EED) is a disease of the small intestine affecting children and adults in low and middle income countries. Arising as a consequence of repeated infections, gut inflammation results in impaired intestinal absorptive and barrier function, leading to poor nutrient uptake and ultimately to stunting and other developmental limitations. Progress towards new biomarkers and interventions for EED is hampered by the practical and ethical difficulties of cross-validation with the gold standard of biopsy and histology...
November 15, 2017: Nature Reviews. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/29139395/three-dimensional-architecture-hybrid-perovskite-solar-cells-using-cds-nanorod-arrays-as-an-electron-transport-layer
#17
Zihang Song, Guoqing Tong, Huan Li, Guopeng Li, Shuai Ma, Shimeng Yu, Qian Liu, Yang Jiang
Three-dimensional (3-D) architecture perovskite solar cells (PSCs) using CdS nanorod arrays as electron transport layer were designed and prepared by layer-by-layer via a physical-chemical vapor deposition process (P-CVD). The CdS NRs not only provided a scaffold to perovskite film, but also increased the interfacial contact between the perovskite film and electron transport layer. As an optimized result, a high power conversion efficiency (PCE) of 12.46% with a short-circuit current density (Jsc) of 19.88 mA cm-2, an open-circuit voltage (Voc) of 1...
November 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29139299/integrating-zeolite-type-chalcogenide-with-titanium-dioxide-nanowires-for-enhanced-photoelectrochemical-activity
#18
Chengyu Mao, Yanxiang Wang, Wei Jiao, Xitong Chen, Qipu Lin, Mingli Deng, Yun Ling, Yaming Zhou, Xianhui Bu, Pingyun Feng
Developing photoanodes with efficient visible-light harvesting and excellent charge separation still remains a key challenge in photoelectrochemical water splitting. Here zeolite-type chalcogenide CPM-121 is integrated with TiO2 nanowires to form a heterostructured photoanode, in which crystalline CPM-121 particles serve as a visible light absorber and TiO2 nanowires serve as an electron conductor. Owing to the small band gap of chalcogenides, the hybrid electrode demonstrates obvious absorption in visible-light range...
November 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29139298/sic-nanofiber-mat-a-broadband-microwave-absorber-and-the-alignment-effect
#19
Yi Hou, Laifei Cheng, Yani Zhang, Yong Yang, Chaoran Deng, Zhihong Yang, Qi Chen, Xiaoqing Du, Lianxi Zheng
Fiber alignment is a key factor that determines the physical properties of nanofiber mats. In this work, SiC nanofiber mats with or without fiber alignment are fabricated via electrospinning and the microwave electromagnetic (EM) properties of their silicone resin composites (5wt.%) are investigated in 2-18 GHz. By comparing with the composite containing smashed nanofiber, it is found that the nanofiber mats show superior dielectric loss and a minimal reflection loss (RL) of around -49 dB at 8.6 GHz and 4.3 mm thickness, associated with a broad effective absorption (<-10 dB) bandwidth (EAB) of about 7...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29139287/a-high-performance-self-powered-photodetector-based-on-perovskite-and-graphene
#20
Juan Li, Shihao Yuan, Guanqi Tang, Guijun Li, Dan Liu, Jing Li, Xihong Hu, Yucheng Liu, Jianbo Li, Zhou Yang, Shengzhong Frank Liu, Zhike Liu, Fei Gao, Feng Yan
An ideal photodetector must have a fast response, a wide tunable spectral response, be highly responsive, low power consumption and a facile fabrication process. In this work, a self-powered photodetector with a graphene electrode and pervoskite photoactive layer is assembled for the first time. The graphene electrode is prepared using a solution transfer process, and perovskite using a solution coating process, which makes the device low-cost. The graphene can form a schottky junction with TiO2 to efficiently transfer electrons from perovskite to TiO2, and acts as an efficient hole-extraction layer to let the holes quickly transport to electrode...
November 15, 2017: ACS Applied Materials & Interfaces
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