keyword
MENU ▼
Read by QxMD icon Read
search

Absorption

keyword
https://www.readbyqxmd.com/read/28930632/co2-absorption-in-the-ionic-liquids-immobilized-on-solid-surface-by-molecular-dynamics-simulation
#1
Ziqian Tang, Linghong Lu, Zhongyang Dai, Wenlong Xie, Lili Shi, Xiaohua Lu
Based on our previous experimental research, we studied the absorption of CO2 in the ionic liquid, 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([hmim][Tf2N] ), immobilized on TiO2 [rutile (110) ] with different thickness by molecular dynamics simulation. The effects of the properties (hydrophobicity and hydrophilicity) of solid interfaces were also studied with IL immobilized on graphite and TiO2 respectively. We studied the influence of the thickness of IL immobilized on TiO2 on the absorption of CO2 via structural and dynamical properties...
September 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28930472/light-absorption-of-secondary-organic-aerosol-composition-and-contribution-of-nitro-aromatic-compounds
#2
Mingjie Xie, Xi Chen, Michael D Hays, Michael Lewandowski, John H Offenberg, Tadeusz Edward Kleindienst, Amara Holder
Secondary organic aerosol (SOA) might affect the atmospheric radiation balance through absorbing light at shorter visible and UV wavelengths. However, the composition and optical properties of light-absorbing SOA is poorly understood. In this work, SOA filter samples were collected during individual chamber experiments with three biogenic and eight aromatic volatile organic compound (VOC) precursors in the presence of NOX and H2O2. Compared with the SOA generated using the aromatic precursors, biogenic SOA in general exhibits negligible light absorption above 350 nm; the aromatic SOA generated in the presence of NOX showed stronger light absorption than that generated with H2O2...
September 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28930435/new-triplet-sensitization-routes-for-photon-upconversion-thermally-activated-delayed-fluorescence-molecules-inorganic-nanocrystals-and-singlet-to-triplet-absorption
#3
Nobuhiro Yanai, Nobuo Kimizuka
Photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its possible applications to renewable energy production and biological fields. In particular, the UC of near-infrared (NIR) light to visible (vis) light is imperative to overcome the Shockley-Queisser limit of single-junction photovoltaic cells, and the efficiency of photocatalytic hydrogen production from water can also be improved with the aid of vis-to-ultraviolet (UV) UC. However, both processes have met limitations in the wavelength range, efficiency, and sensitivity for weak incident light...
September 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28930344/electron-dynamics-in-mos2-graphite-heterostructures
#4
Xinwu Zhang, Dawei He, Lixin Yi, Siqi Zhao, Jiaqi He, Yongsheng Wang, Hui Zhao
The electron dynamics in heterostructures formed by multilayer graphite and monolayer or bulk MoS2 were studied by femtosecond transient absorption measurements. Samples of monolayer MoS2-multilayer graphite and bulk MoS2-multilayer graphite were fabricated by exfoliation and dry transfer techniques. Ultrafast laser pulses were used to inject electron-hole pairs into monolayer or bulk MoS2. The transfer of these photocarriers to the adjacent multilayer graphite was time resolved by measuring the differential reflection of a probe pulse...
September 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28930313/redistribution-of-valence-and-conduction-band-states-depending-on-the-method-of-modification-of-sio2-structure
#5
A S Konashuk, E O Filatova
The effect of introducing porosity and the insertion of methyl groups in SiO4 tetrahedra on the distribution of valence and conduction band states of SiO2 was studied using high-resolution near edge X-ray absorption fine structure spectroscopy (NEXAFS) and soft X-ray photoelectron spectroscopy (XPS). Alignment of NEXAFS spectra and valence band XPS spectra in a common energy scale was performed using binding energies of the initial levels obtained by XPS. It was established that the insertion of methyl groups into SiO4 tetrahedra leads to a significant shift of the top of the valence band EV to smaller binding energies due to the reduction of the electronegativity of the nearest surrounding neighbors of the Si atoms, while introducing porosity changes the position of EV only slightly...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28930309/a-global-method-for-handling-fluorescence-spectra-at-high-concentration-derived-from-the-competition-between-emission-and-absorption-of-colloidal-cdte-quantum-dots
#6
Thomas Noblet, Laurent Dreesen, Julie Hottechamps, Christophe Humbert
We investigate the effects of the concentration of CdTe quantum dots (QDs) on their fluorescence in water. The emission spectra, acquired in right angle geometry, exhibit highly variable shapes. The measurements evidence a critical value of the concentration beyond which the intensity and the spectral bandwidth decrease and the fluorescence maximum is redshifted. To account for these observations, we develop a model based on the primary and secondary inner filter effects. The accuracy of the model ensures that the concentration dependent behaviour of QD fluorescence is completely due to inner filter effects...
September 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28930173/polyphenols-from-root-tubercles-and-grains-cropped-in-brazil-chemical-and-nutritional-characterization-and-their-effects-on-human-health-and-diseases
#7
REVIEW
Diego Dos Santos Baião, Cyntia Silva de Freitas, Laidson Paes Gomes, Davi da Silva, Anna Carolina N T F Correa, Patricia Ribeiro Pereira, Eduardo Mere Del Aguila, Vania Margaret Flosi Paschoalin
Throughout evolution, plants have developed the ability to produce secondary phenolic metabolites, which are important for their interactions with the environment, reproductive strategies and defense mechanisms. These (poly)phenolic compounds are a heterogeneous group of natural antioxidants found in vegetables, cereals and leguminous that exert beneficial and protective actions on human health, playing roles such as enzymatic reaction inhibitors and cofactors, toxic chemicals scavengers and biochemical reaction substrates, increasing the absorption of essential nutrients and selectively inhibiting deleterious intestinal bacteria...
September 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28930161/changes-in-bioavailability-of-omega-3-dha-through-alpha-tocopheryl-phosphate-mixture-tpm-after-oral-administration-in-rats
#8
Roksan Libinaki, Paul D Gavin
Benefits of Omega-3 Docosahexaenoic acid (DHA) supplements are hindered by their poor solubility and bioavailability. This study investigated the bioavailability of various formulations of Omega-3 and tocopheryl phosphate mixture (TPM), following oral administration in rats, and assessed whether TPM could improve the oral absorption of DHA. The rats were administered with a high (265.7 mg/kg) or low dose (88.6 mg/kg) of DHA. TPM was examined at 1:0.1 w/w (low TPM dose) and 1:0.5 w/w (high TPM dose). Over 24 h, the DHA plasma concentration followed a TPM dose-dependent relationship, reflected in the higher mean Cmax values (78...
September 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28930099/optical-properties-of-graphene-nanocones-under-electric-and-magnetic-fields
#9
Pable Ulloa, Monica Pacheco, Andrea Latge
Here we present a theoretical study of the optical properties of graphene nanocones tuned by external electric and magnetic fields. We investigate the effects of the size and topology of the carbon nanostructures on the density of states and on the electro- and magneto-absorption of linearly polarized electromagnetic radiation in different nanocone geometries. We find that the electric field induces changes in the electric charge distribution mainly at the cone edges. In the infrared range the absorption coefficient shows a peculiar dependence on the electric field (magnitude and direction) and on the photon polarization for all investigated structures...
September 20, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28929793/stainless-steel-and-polyethylene-surfaces-functionalized-with-silver-nanoparticles
#10
José Fq Fialho, Emiliane Aa Naves, Patrícia C Bernardes, Deusmaque C Ferreira, Letícia D Dos Anjos, Rogério V Gelamo, João Pn de Sá, Nélio J de Andrade
The antimicrobial effects of a stainless steel surface and a polyethylene surface functionalized with silver nanoparticles on the adhesion of different bacteria and the changes in physical and chemical characteristics of these surfaces that influence biofilm formation were evaluated. The functionalized surfaces of polyethylene and stainless steel were more hydrophobic than the control ones. The bacterial surfaces were hydrophilic. The adhesion of all bacteria was thermodynamically favorable (ΔGadhesion<0) on all surfaces functionalized and control...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28929738/plasmonic-effects-of-metallic-nanoparticles-on-enhancing-performance-of-perovskite-solar-cells
#11
Qi Luo, Chenxi Zhang, Xueshuang Deng, Hongbing Zhu, Zhiqiang Li, Zengbo Wang, Xiaohong Chen, Sumei Huang
We report the systematic design and formation of plasmonic perovskite solar cells (PSCs) by integrating Au@TiO2 core-shell nanoparticles (NPs) into porous TiO2 and/or perovskite semiconductor capping layers. The plasmonic effects in the formed PSCs are examined. The most efficient configuration is obtained by incorporating Au@TiO2 NPs into both the porous TiO2 and the perovskite capping layers, which increases the power conversion efficiency (PCE) from 12.59 % to 18.24 %, demonstrating over 44% enhancement, compared with the reference device without the metal NPs...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929737/two-dimensional-magnetic-semiconductor-in-feroxyhyte-%C3%AE-feooh
#12
Imran Khan, Arqum Hashmi, M Umar Farooq, Jisang Hong
A few years ago, it was claimed that the two-dimensional (2D) feroxyhyte (δ-FeOOH) layer could possess a net magnetic moment and it could be applied for potential spintronics application because it showed a band gap. However, the exact crystal structure is still unknown. Hereby, we investigate the crystal structure, electronic band structure, magnetic and optical properties of 2D δ-FeOOH using density functional calculations. Based on the experimental observation and dynamical stability calculations, we propose that the 2D δ-FeOOH originates from a bulk Fe(OH)2 via oxidation...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28929693/-intestinal-absorption-of-ginseng-radix-et-rhizoma-extract-combined-with-acori-tatarinowii-rhizoma-in-rats
#13
Meng-Cheng Zheng, Shou-Ying Du, Shan Jia, Jun-Ming Ma, Qing Zhang, Jie Bai, Yang Lu
To investigate the changes in intestinal absorption of ginsenosides Rg₁, ginsenosides Re and ginsenosides Rd after combined administration of Ginseng Radix et Rhizoma extract and Acori Tatarinowii Rhizoma, in order to confirm whether the combined administration is scientific and rational, and provide experimental basis for pharmaceutical studies of the formula. An in vivo single-pass perfusion method was performed to study the effect of various concentrations of ginsenosides Rg₁, ginsenosides Re, ginsenosides Rd on the intestinal absorption at duodenum, jejunum, ileum and colon...
November 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28929682/-virtual-screening-for-components-in-chicory-combined-with-cnt2-target-based-on-molecular-docking
#14
Yue Zhou, Bing Zhang, Zhi-Jian Lin, Xiao-Meng Zhang, Fan Li, Hai-Ge Wang, Xue-Jie Wang
To virtual screen the compound of Chicory combined with the concentrative nucleoside transporter 2 (CNT2) in molecular docking technology.The homology model of hCNT2 was produced, and then the Vina software was employed to virtual screen the Chicory compound combined with CNT2. Compared with 7,8,3'-trihydroxyflavone, a CNT2 inhibitors, 23 score higher chicory compounds were hit.Meanwhile, the ten top compounds have been revealed that play important role in decrease the uric level. The bioactivity to CNT2 needs to be investigatedin experiment...
November 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28929664/-metabolism-of-paeoniflorin-by-rat-intestinal-flora-in-vitro
#15
Zhong-Cheng Ke, Nan Yang, Xue-Feng Hou, Ai-Dong Wang, Liang Feng, Xiao-Bin Jia
In order to clarify the effect of intestinal flora on the absorption and metabolism of paeoniflorin in vivo, the metabolism of paeoniflorin by rat intestinal flora was studied under the in vitro anaerobic condition. Paeoniflorin was incubated with rat anaerobic intestinal flora for 48 h, and UPLC was used to detect the changes of paeoniflorin at different incubation time points under the following chromatographic conditions:WelchromTM C₁₈ chromatographic column (4.6 mm×100 mm, 5 μm), with 0.1% formic acid(A)-acetonitrile(B) as the mobile phase for gradient elution...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28929661/-evaluation-of-effect-of-supplementing-qi-and-activating-blood-decoction-based-on-combined-model-of-intestinal-out-cardiac-muscle-cells-and-discussion-of-its-mechanism
#16
Ya Geng, Hong-Jun Yang, Yue-Xiang Ma, Jing-Jing Zhang, Yi Zhang, De-Feng Li, Fang-Bo Zhang, Hai-Yu Xu
This research firstly establishes the oxidative damage model of H9c2 induced by H2O2 and screens the concentration range of intestines absorption liquid of Qi benefiting and blood circulation activating formula which possess external myocardium protection function. Then, the thesis chooses 4 dosages to conduct experiments:examining the protection function of intestines absorption liquid of Qi benefiting and blood circulation activating formula on H9c2 to provide reference for clinical prevention and curing of relative heart diseases of oxidative stress injury; as well as examining the H9c2 cardiac muscle cell vigour, cellular morphology, SOD, MDA and other indexes to primarily evaluate and discuss the functional mechanism of intestines absorption liquid of Qi benefiting and blood circulation activating formula...
October 2016: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28929611/microfluidic-generation-of-bioinspired-spindle-knotted-graphene-microfibers-for-oil-absorption
#17
Ziqian Wu, Jie Wang, Ze Zhao, Yunru Yu, Luoran Shang, Yuanjin Zhao
Graphene materials have a demonstrated value in water treatment. Efforts to promote these materials are focused on the generation of functional graphene adsorbents for effectively removing contaminants from water. Here, inspired by the conformation of spider silks, we present a novel graphene microfiber material with spindle-knotted microstructures by using a microfluidic emulsification and spinning collaborative technology. The size and spacing of the spindle-knots were highly controllable by adjusting the flow rates of microfluidics during the generation process of the microfibers...
September 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28929575/development-of-an-optical-sensor-for-chlortetracycline-detection-based-on-the-fluorescence-quenching-of-l-tryptophan
#18
Hui Zhang, Hongyun Chen, Shuang Pan, Huan Yang, Jingjing Yan, Xiaoli Hu
A simple and selective spectrofluorimetric method for the detection of chlortetracycline (CTC) was studied. In pH 7.4 buffer medium l-tryptophan (l-Trp), applied as the fluorescence probe, interacted with CTC resulting in fluorescence quenching of the probe. CTC was detected with maximum excitation and emission wavelengths at λex /λem  = 275/350 nm. Notably, quenching of fluorescence intensities was positively proportional to the CTC concentration over the range of 0.65-30 μmol L(-1) and the limit of detection was 0...
September 20, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28929461/the-isolation-culture-and-propagation-of-murine-intestinal-enteroids-for-the-study-of-dietary-lipid-metabolism
#19
Diana Li, Hongli Dong, Alison B Kohan
Since the initial report in 2009 by Sato and Clevers, primary enteroids have been of major interest in the fields of stem cell biology and gastrointestinal (GI) tract biology. More recently, we and others have made major inroads into the physiological relevance of these enteroid models and have shown that enteroids derived from the stomach, intestine, or colon recapitulate major functions of these tissues, namely, gastric acid secretion, lipid absorption and lipoprotein secretion, and ion transport. Here, we detail the isolation of stem cells from the small intestine and the culture and propagation of those stem cells into mature three-dimensional enteroids...
September 20, 2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28929451/comparison-of-nanohole-type-and-nanopillar-type-patterned-metallic-electrodes-incorporated-in-organic-solar-cells
#20
Wenyan Wang, Yanxia Cui, Kin Hung Fung, Ye Zhang, Ting Ji, Yuying Hao
Both the nanohole- and nanopillar-type patterned metallic electrodes (PMEs) have been introduced in organic solar cells (OSCs) for improving device performances experimentally, but there is few work addressing the similarities and differences between them. In this theoretical work, we systematically compare the impact of the nanohole- and nanopillar-type PMEs on the performance of an OSC based on hybridized cavity resonances. By optimizing the geometrical parameters of each PME, we obtained an interesting result that the integrated absorption efficiencies in the active layer with different optimized PMEs are almost the same (both are equal to 82...
September 19, 2017: Nanoscale Research Letters
keyword
keyword
62989
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"