keyword
MENU ▼
Read by QxMD icon Read
search

Desorption

keyword
https://www.readbyqxmd.com/read/28742986/adsorption-of-mesitylene-via-mesoporous-adsorbents
#1
Kai Chun Nien, Feng Tang Chang, Moo Been Chang
Mesitylene (or 1,3,5-trimethylbenzene) is a volatile organic compound emitted from various industrial processes, e.g., spray coating. Its emissions have become a critical issue because mesitylene is toxic and cannot be removed using traditional adsorbents, e.g., zeolite (H-ZSM-5; the diameter of mesitylene molecules is greater than the pore size of H-ZSM-5). Hence, an adsorbent with a large pore size, MCM-41, is used in this study to investigate its adsorption capacity for mesitylene and is compared with that of H-ZSM-5...
July 25, 2017: Journal of the Air & Waste Management Association
https://www.readbyqxmd.com/read/28741854/toward-activity-origin-of-electrocatalytic-hydrogen-evolution-reaction-on-carbon-rich-crystalline-coordination-polymers
#2
Lihuan Wang, Diana C Tranca, Jian Zhang, Yanpeng Qi, Stavroula Sfaelou, Tao Zhang, Renhao Dong, Xiaodong Zhuang, Zhikun Zheng, Gotthard Seifert
The fundamental understanding of electrocatalytic active sites for hydrogen evolution reaction (HER) is significantly important for the development of metal complex involved carbon electrocatalysts with low kinetic barrier. Here, the MSx Ny (M = Fe, Co, and Ni, x/y are 2/2, 0/4, and 4/0, respectively) active centers are immobilized into ladder-type, highly crystalline coordination polymers as model carbon-rich electrocatalysts for H2 generation in acid solution. The electrocatalytic HER tests reveal that the coordination of metal, sulfur, and nitrogen synergistically facilitates the hydrogen ad-/desorption on MSx Ny catalysts, leading to enhanced HER kinetics...
July 25, 2017: Small
https://www.readbyqxmd.com/read/28741641/highly-oriented-langmuir-blodgett-film-of-silver-cuboctahedra-as-an-effective-matrix-free-sample-plate-for-surface-assisted-laser-desorption-ionization-mass-spectrometry
#3
Tsung-Rong Kuo, Yin-Chien Chen, Chiung-I Wang, Tzu-Hau Shen, Hong-Yi Wang, Xi-Yu Pan, Di-Yan Wang, Chien-Chung Liou, Yi-Hsuan Chang, Yi-Chia Chen, Yueh-Hsiu Wu, Yun-Ru Liu, Yun-Ho Lin, Cho-Chun Hu, Chia-Chun Chen
The design of a homogeneous sample plate to solve the sweet heating spot issues is the key step to expand the applicability of surface-assisted laser desorption/ionization mass spectrometry (SALDI MS). Herein, large-scale and highly oriented Langmuir-Blodgett (LB) films of uniform silver nanocrystals have been fabricated as a highly efficient and matrix-free sample plate for SALDI MS. Three individual silver nanocrystals (cubes, cuboctahedra and octahedra) assembled LB films have been applied as the sample plates for glucose detection by SALDI MS without an additional matrix...
July 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28741297/maldi-ft-icr-ms-for-archaeological-lipid-residue-analysis
#4
Ester Oras, Signe Vahur, Sven Isaksson, Ivari Kaljurand, Ivo Leito
Soft-ionization methods are currently at the forefront of developing novel methods for analysing degraded archaeological organic residues. Here we present little-used soft ionisation method of matrix assisted laser desorption/ionization - Fourier transform - ion cyclotron resonance - mass spectrometry (MALDI-FT-ICR-MS) for the identification of archaeological lipid residues. It is a high-resolution and sensitive method with low limits of detection capable of identifying lipid compounds in small concentrations, thus providing a highly potential new technique for the analysis of degraded lipid components...
July 24, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28739797/unraveling-drug-penetration-of-echinocandin-antifungals-at-the-site-of-infection-in-an-intra-abdominal-abscess-model
#5
Yanan Zhao, Brendan Prideaux, Yoji Nagasaki, Min Hee Lee, Pei-Yu Chen, Landry Blanc, Hsinpin Ho, Cornelius J Clancy, Minh Hong Nguyen, Véronique Dartois, David S Perlin
Intra-abdominal candidiasis (IAC) is a prominent invasive fungal infection associated with high mortality. Prompt antifungal therapy and source control are crucial for successful treatment. Echinocandin antifungal drugs are first-line agents. Yet, their clinical effectiveness is highly variable with known potential for breakthrough resistance, and little is known about drug exposure at the site of infection. Using matrix-assisted desorption/ionization mass spectrometry imaging technology, we investigated the spatial and quantitative distribution in tissue lesions for two echinocandin drugs, micafungin and CD101, in a clinically relevant IAC mouse model...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739337/evaluation-of-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-for-identification-of-human-oral-capnocytophaga-species
#6
Anne Jolivet-Gougeon, Nicolas Helsens, Elise Renard, Zohreh Tamanai-Shacoori, Martine Bonnaure-Mallet
Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) was evaluated for rapid identification of cfxA PCR positive and negative Capnocytophaga strains. Colonies were grown on blood agar, incubated anaerobically at 37 °C for 48 h, and were then evaluated by MALDI-TOF MS and 16S rRNA gene sequencing. Both methods identified all colonies to the genus level. The MALDI-TOF MS method gave the same result, at the species level, as 16S rRNA gene sequencing for 41/53 Capnocytophaga sp...
July 21, 2017: Anaerobe
https://www.readbyqxmd.com/read/28738817/exacerbation-of-bronchiectasis-by-pseudomonas-monteilii-a-case-report
#7
Aditi, Malini Shariff, Kiran Beri
BACKGROUND: Pseudomonas spp are important opportunistic and nosocomial pathogens. One such species is Pseudomonas monteilii (P. monteilii). It has been described as an environmental contaminant and potential pathogen. We identified this organism as the causative agent of an exacerbation of bronchiectasis and an environmental contaminant in our hospital on two separate occasions. CASE PRESENTATION: P. monteilii was the cause of an exacerbation of bronchiectasis in a 30-year-old HIV negative male...
July 24, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28738588/maldi-matrix-assisted-laser-desorption-ionization-imaging-mass-spectrometry-ims-of-skin-aspects-of-sample-preparation
#8
Cristiana Santos de Macedo, David M Anderson, Kevin L Schey
MALDI (matrix assisted laser desorption ionization) Imaging Mass Spectrometry (IMS) allows molecular analysis of biological materials making possible the identification and localization of molecules in tissues, and has been applied to address many questions on skin pathophysiology, as well as on studies about drug absorption and metabolism. Sample preparation for MALDI IMS is the most important part of the workflow, comprising specimen collection and preservation, tissue embedding, cryosectioning, washing, and matrix application...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738585/ordered-mesoporous-silica-film-as-a-novel-fiber-coating-for-solid-phase-microextraction
#9
Hui Jiang, Jiansheng Li, Xingru Hu, Jinyou Shen, Xiuyun Sun, Weiqing Han, Lianjun Wang
Ordered mesoporous silica (OMS) film supported on anodized titanium wire was fabricated as a new solid phase microextraction (SPME) fiber for the extraction of chlorophenols (CPs) from aqueous media followed by the determination with gas chromatography flame ionization detection (GC-FID). The supported OMS film was prepared via a solvent evaporation-induced self-assembly approach (EISA) combined with dip-coating technology. Commonly used fragile fused silica fiber was replaced by anodized titanium wire. The coating materials were characterized by N2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738195/proteomic-and-genetics-insights-on-the-response-of-the-bacteriocinogenic-lactobacillus-sakei-crl1862-during-biofilm-formation-on-stainless-steel-surface-at-10%C3%A2-c
#10
Mariana Pérez-Ibarreche, Lucía M Mendoza, Graciela Vignolo, Silvina Fadda
Some lactic acid bacteria have the ability to form biofilms on food-industry surfaces and this property could be used to control food pathogens colonization. Lactobacillus sakei CR1862 was selected considering its bacteriocinogenic nature and ability to adhere to abiotic surfaces at low temperatures. In this study, the proteome of L. sakei CRL1862 grown either under biofilm on stainless steel surface and planktonic modes of growth at 10°C, was investigated. Using two-dimensional gel electrophoresis, 29 out of 43 statistically significant spots were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry...
July 4, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28738076/the-comparison-of-chca-solvent-compositions-for-improving-lc-maldi-performance-and-its-application-to-study-the-impact-of-aflatoxin-b1-on-the-liver-proteome-of-diabetes-mellitus-type-1-mice
#11
Fuu-Jen Tsai, Shih-Yin Chen, Yu-Ching Liu, Hsin-Yi Liao, Chao-Jung Chen
In nanoflow liquid chromatography-matrix-assisted laser desorption/ionization tandem time-of-flight (nanoLC-MALDI-TOF/TOF) approaches, it is critical to directly apply small amounts of the sample elutes on the sample target using a nanoLC system due to its low flow rate of 200 ~ 300 nl/min. It is recommended to apply a sheath liquid containing a matrix with a several μL/min flow rate at the end of the nanoLC column to ensure a larger co-eluted droplet for more reproducible sample spotting and avoid the laborious task of post-manual matrix spotting...
2017: PloS One
https://www.readbyqxmd.com/read/28737838/improved-bacterial-identification-directly-from-urine-samples-with-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry
#12
Koichi Kitagawa, Katsumi Shigemura, Ken-Ichiro Onuma, Masako Nishida, Mayu Fujiwara, Saori Kobayashi, Mika Yamasaki, Tatsuya Nakamura, Fukashi Yamamichi, Toshiro Shirakawa, Issei Tokimatsu, Masato Fujisawa
BACKGROUND: Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) contributes to rapid identification of pathogens in the clinic but has not yet performed especially well for Gram-positive cocci (GPC) causing complicated urinary tract infection (UTI). The goal of this study was to investigate the possible clinical use of MALDI-TOF MS as a rapid method for bacterial identification directly from urine in complicated UTI. METHODS: MALDI-TOF MS was applied to urine samples gathered from 142 suspected complicated UTI patients in 2015-2017...
July 24, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28736481/gas-uptake-of-3-d-printed-acrylonitrile-butadiene-styrene-abs-using-a-vacuum-apparatus-designed-for-absorption-and-desorption-studies
#13
Makfir Sefa, Zeeshan Ahmed, James A Fedchak, Julia Scherschligt, Nikolai Klimov
We describe a vacuum apparatus for determining the outgassing rate into vacuum, the diffusion coefficient, and the amount of gas absorbed for various materials. The diffusion coefficient is determined from a model applied to time-dependent desorption data taken using a throughput method. We used this method to determine the diffusion coefficient, D, for H2O in 3-D printed acrylonitrile butadiene styrene (ABS). We found DH2O = 8.3 × 10(-8) cm(2)/s ± 1.3 × 10(-8) cm(2)/s (k = 1; 67% confidence interval) at 23...
November 2016: Journal of Vacuum Science & Technology. A, Vacuum, Surfaces, and Films
https://www.readbyqxmd.com/read/28736380/-association-of-fasl-844t-c-gene-polymorphism-with-fasl-expression-in-the-nucleus-pulposus-of-degenerative-lumbar-intervertebral-discs
#14
Zheng-Ming Sun, Pengmaojiacuo Pengmaojiacuo, Hong-Hai Xu, Yan-Hai Chang, Xue-Yuan Wu, Xiang-Hui Dong, Ming Ling
OBJECTIVE: To investigate the association of FasL-844T/C gene polymorphism with the magnetic resonance imaging (MRI) findings and FasL expression in the nucleus pulposus of degenerative lumbar intervertebral discs. METHODS: Lumbar MRI data, venous blood and nucleus pulposus were collected from 105 patients with lumbar disc herniation. The genotypes of FasL-844T/C gene of the patients were determined using matrix-assisted laser desorption ionization time-of-flight mass spectrometry...
July 20, 2017: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
https://www.readbyqxmd.com/read/28735713/superparamagnetic-graphene-oxide-magnetite-nanoparticle-composites-for-uptake-of-actinide-ions-from-mildly-acidic-feeds
#15
Trilochan Gadly, Prasanta K Mohapatra, Dinesh K Patre, Rajesh B Gujar, Alka Gupta, Anand Ballal, Sunil K Ghosh
Super paramagnetic graphene oxide (GO) - Fe3O4 nanoparticle composites were prepared and characterized by conventional techniques such as XRD, SEM, EDX, FT-IR, Raman, XPS, DLS and zeta potential, etc. TEM studies have confirmed nanoparticle nature of the composites. The GO-magnetic nanoparticle composites can be dispersed in mildly acidic aqueous solutions and get concentrated in a small volume under application of an external magnetic field. The composites were evaluated for the uptake of actinide ions such as Am(3+), UO2(2+), Th(4+) and Pu(4+) from mildly acidic aqueous solutions...
July 5, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28735541/photoresponsive-foams-generated-by-a-rigid-surfactant-derived-from-dehydroabietic-acid
#16
Lan Lei, Danhua Xie, Binglei Song, Jianzhong Jiang, Xiaomei Pei, Zhenggang Cui
Innovation in the structure of surfactants is crucial to the construction of a surfactant-based system with intriguing properties. With dehydroabietic acid as a starting material, a nearly totally rigid azobenzene surfactant (R-azo-Na) was synthesized. The trans-R-azo-Na formed stable foams with half-lives of 636, 656, 976, and 872 min for 0.3, 1, 2, and 4 mmol∙L-1 aqueous solutions, respectively. Under UV light irradiation, a fast collapse of the foams was observed, showing an in situ response. The excellent foam stability of trans-R-azo-Na leads to the extremely high photoresponsive efficiency...
July 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28735220/mesoporous-calcium-phosphate-using-casein-as-a-template-application-to-bovine-serum-albumin-sorption
#17
Oberto Grangeiro da Silva, Marco Marciel Alves, Ieda Maria Garcia Dos Santos, Maria Gardennia Fonseca, Maguy Jaber
Mesoporous hydroxyapatites were synthesized at room temperature using casein as a template, and key experimental factors, such as casein concentration, pH and extraction of casein in the final solids by washing and thermal treatment, were systematically investigated. The X-Ray Diffraction (XRD) patterns confirmed the synthesis of well-crystallized hydroxyapatite. The N2 adsorption/desorption isotherms were in agreement with the formation of mesoporous hydroxyapatite with a maximum surface area of 106m(2)g(-1)...
July 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28735197/synthesis-of-porous-polymer-based-solid-amine-adsorbent-effect-of-pore-size-and-amine-loading-on-co2-adsorption
#18
Fenglei Liu, Shuixia Chen, Yanting Gao
A series of porous polymers was synthesized by a suspension polymerization of divinylbenzene (DVB) and ethylene glycol dimethyl acrylate (EGDMA), which was further functionalized with polyethyleneimine (PEI) for CO2 capture. The results showed that the synthesized DVB and EGDMA (DE) copolymers were an effective support for loading PEI because of its larger pore size and specific surfaces area. It was found that DE (30, 10) loaded with 30wt% PEI exhibited a higher CO2 adsorption amount of 3.28mmol/g at 25°C under dry condition...
July 17, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28735185/mil-101-cr-go-for-dispersive-micro-solid-phase-extraction-of-pharmaceutical-residue-in-chicken-breast-used-in-microwave-assisted-coupling-with-hplc-ms-ms-detection
#19
Yudan Wang, Xinpeng Dai, Xi He, Lin Chen, Xiaohong Hou
In this work, MIL-101(Cr)@GO (Graphite Oxide) was synthesized using a hydrothermal synthesis method and was applied as a dispersive micro-solid-phase extraction (D-μ-SPE) sorbent for the efficient concentration of four residual drugs (metronidazole, MNZ; tinidazole, TNZ; chloramphenicol, CAP; sulfamethoxazole, SMX). Meanwhile, the extraction process was optimized by combining it with microwave-assisted extraction. Factors affecting the D-μ-SPE efficiency, such as selection of sorbent materials, pH of the sample solution, salting-out effect, amount of used material, extraction time, desorption solvent and desorption time, were studied...
July 11, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28735157/effects-of-adhesions-of-amorphous-fe-and-al-hydroxides-on-surface-charge-and-adsorption-of-k-and-cd-2-on-rice-roots
#20
Zhao-Dong Liu, Hai-Cui Wang, Qin Zhou, Ren-Kou Xu
Iron (Fe) and aluminum (Al) hydroxides in variable charge soils attached to rice roots may affect surface-charge properties and subsequently the adsorption and uptake of nutrients and toxic metals by the roots. Adhesion of amorphous Fe and Al hydroxides onto rice roots and their effects on zeta potential of roots and adsorption of potassium (K(+)) and cadmium (Cd(2+)) by roots were investigated. Rice roots adsorbed more Al hydroxide than Fe hydroxide because of the greater positive charge on Al hydroxide. Adhesion of Fe and Al hydroxides decreased the negative charge on rice roots, and a greater effect of the Al hydroxide...
July 20, 2017: Ecotoxicology and Environmental Safety
keyword
keyword
59674
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"