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Methylene Chloride

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https://www.readbyqxmd.com/read/29232146/switchable-photoacoustic-intensity-of-methylene-blue-via-sodium-dodecyl-sulfate-micellization
#1
Junxin Wang, Ching-Yu Lin, Colman Moore, Anamik Jhunjhunwala, Jesse V Jokerst
The interaction between methylene blue (MB) and sodium dodecyl sulfate (SDS) has been widely studied spectroscopically, but details about their interactions are limited. Here, we combined photoacoustic (PA) imaging with nanoparticle tracking analysis (NTA) and spectroscopy to further elucidate this interaction. PA imaging of 0.05 mM MB showed a 492-fold increase in intensity upon addition of 3.47 mM SDS. Higher concentrations above SDS's critical micelle concentration (CMC) at 8.67 mM decreased the PA intensity by 54-fold...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29213257/bacterial-community-dynamics-in-dichloromethane-contaminated-groundwater-undergoing-natural-attenuation
#2
Justin Wright, Veronica Kirchner, William Bernard, Nikea Ulrich, Christopher McLimans, Maria F Campa, Terry Hazen, Tamzen Macbeth, David Marabello, Jacob McDermott, Rachel Mackelprang, Kimberly Roth, Regina Lamendella
The uncontrolled release of the industrial solvent methylene chloride, also known as dichloromethane (DCM), has resulted in widespread groundwater contamination in the United States. Here we investigate the role of groundwater bacterial communities in the natural attenuation of DCM at an undisclosed manufacturing site in New Jersey. This study investigates the bacterial community structure of groundwater samples differentially contaminated with DCM to better understand the biodegradation potential of these autochthonous bacterial communities...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29185178/vasorelaxant-activities-and-the-underlying-pharmacological-mechanisms-of-gynura-procumbens-merr-leaf-extracts-on-rat-thoracic-aorta
#3
Zafar Iqbal, Idris Bello, Mohd Zaini Asmawi, Majed Ahmed Al-Mansoub, Ashfaq Ahmad, Qaiser Jabeen, Yam Mun Fei
Previous studies have investigated the cardiovascular activity of Gynura procumbens Merr. single-solvent extracts. The objective of this study was to evaluate the in vitro vasorelaxant properties and the underlying pharmacological mechanisms of serial extracts and fractions of Gynura procumbens (GP). The leaves of GP were serially extracted with petroleum ether, chloroform, methanol and water using the maceration method. Suspended aortic ring preparations were pre-contracted with phenylephrine (PE 1 µM), followed by cumulative addition of GP extracts (0...
November 28, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/29173073/in-vivo-assessment-of-plant-extracts-for-control-of-plant-diseases-a-sesquiterpene-ketolactone-isolated-from-curcuma-zedoaria-suppresses-wheat-leaf-rust
#4
Jae Woo Han, Sang Hee Shim, Kyoung Soo Jang, Yong Ho Choi, Quang Le Dang, Hun Kim, Gyung Ja Choi
As an alternative to synthetic pesticides, natural materials such as plant extracts and microbes have been considered to control plant diseases. In this study, methanol extracts of 120 plants were explored for in vivo antifungal activity against Rhizoctonia solani, Botrytis cinerea, Phytophthora infestans, Puccinia triticina, and Blumeria graminis f. sp. hordei. Of the 120 plant extracts, eight plant extracts exhibited a disease control efficacy of more than 90% against at least one of five plant diseases. In particular, a methanol extract of Curcuma zedoaria rhizomes exhibited strong activity against wheat leaf rust caused by P...
November 27, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29137762/ultrasonic-promoted-rapid-preparation-of-pvc-tio2-bsa-nanocomposites-characterization-and-photocatalytic-degradation-of-methylene-blue
#5
Shadpour Mallakpour, Sima Shamsaddinimotlagh
In the present project in order to prevent agglomeration and better dispersion of TiO2 nanoparticles (NPs) in the poly(vinyl chloride) (PVC) matrix, initially, the surface of TiO2 NPs was covered by bovine serum albumin protein (BSA) via sonication method. Then, the TiO2-BSA powders were embedded into the PVC matrix using ultrasonic irradiations. With mechanical and magnetic stirring homogenous mixture was not obtained. So sonication process was very essential and vital. Physical, chemical and structural properties of the samples were investigated with various tools...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29136777/anti-hypertensive-and-vasodilatory-effects-of-amended-banxia-baizhu-tianma-tang
#6
Chu Shan Tan, Yean Chun Loh, Chiew Hoong Ng, Yung Sing Ch'ng, Mohd Zaini Asmawi, Mariam Ahmad, Mun Fei Yam
Although Banxia Baizhu Tianma Tang (BBT) has been long administered for hypertensive treatment in Traditional Chinese Medicine (TCM), the ratio of the herbal components that makes up the formulation has not been optimized with respect to the anti-hypertensive effect that it inherently possesses. A newly amended BBT (ABBT) formulation was developed using the evidence-based approach of orthogonal stimulus-response compatibility model. The ABBT showed enhanced therapeutic effect while maintaining its traditional theoretical approach rooted in TCM...
November 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29124448/the-photocatalytic-application-of-semiconductor-stibnite-nanostructure-synthesized-via-a-simple-microwave-assisted-approach-in-propylene-glycol-for-degradation-of-dye-pollutants-and-its-optical-property
#7
Eksuree Saksornchai, Jutarat Kavinchan, Somchai Thongtem, Titipun Thongtem
Stibnite (Sb2S3) semiconducting material was successfully synthesized by a rapid and facile microwave route using antimony chloride (SbCl3) and sodiumthiosulfate (Na2S2O3) dissolved in propylene glycol (PG) containing different hydroxyethyl cellulose (HEC) masses. The phase identification, morphology, and elemental composition of products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field- emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, and Fourier transform infrared spectroscopy (FTIR)...
November 9, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29111074/biodegradable-regenerated-cellulose-dispersed-composites-with-improved-properties-via-a-pickering-emulsion-process
#8
Yunchong Zhang, Yang Jiang, Lei Han, Bijia Wang, Hong Xu, Yi Zhong, Linping Zhang, Zhiping Mao, Xiaofeng Sui
Reinforcement of biodegradable polymers with nanocellulose is attractive yet the effectiveness is often compromised by uneven dispersion. In this work, a general method of preparing reinforced biodegradable composites using regenerated cellulose (RC) was developed. From an oil-in-water Pickering emulsion of PLA/methylene chloride stabilized with RC, uniformly dispersed RC/PLA composites was obtained. The resulting RC/PLA composites showed enhanced crystallization and tensile strength of up to 34% compared with the native PLA, while the transmittance in the visible range remained above 70%...
January 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29099133/sub-doppler-infrared-spectroscopy-of-resonance-stabilized-hydrocarbon-intermediates-%C3%AE-3-%C3%AE-4-ch-stretch-modes-and-ch2-internal-rotor-dynamics-of-benzyl-radical
#9
A Kortyna, A J Samin, T A Miller, D J Nesbitt
Highly reactive benzyl radicals are generated by electron dissociative attachment to benzyl chloride doped into a neon-hydrogen-helium discharge and immediately cooled to Trot = 15 K in a high density, supersonic slit expansion environment. The sub-Doppler spectra are fit to an asymmetric-top rotational Hamiltonian, thereby yielding spectroscopic constants for the ground (v = 0) and first excited (v = 1, ν3, ν4) vibrational levels of the ground electronic state. The rotational constants obtained for the ground state are in good agreement with previous laser induced fluorescence measurements (LIF), with vibrational band origins (ν3 = 3073...
November 3, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29089559/dimethyl-diallyl-ammonium-chloride-and-diallylamin-co-polymer-modified-bio-film-derived-from-palm-dates-for-the-adsorption-of-dyes
#10
Mahjoub Jabli, Tawfik A Saleh, Nouha Sebeia, Najeh Tka, Ramzi Khiari
For the first time, co-polymer of dimethyl diallyl ammonium chloride and diallylamin (PDDACD) was used to modify the films derived from the waste of palm date fruits, which were then investigated by the purification of colored aqueous solutions. The physico-chemical characteristics were identified using data color, FT-IR spectroscopy, and SEM features. The modified films were evaluated as adsorbents of Methylene Blue (MB), Direct Yellow 50 (DY50), Reactive Blue 198 (RB198) and Naphtol Blue Black (NBB). High retention capacities were achieved in the following order: The equilibrium da DY50 (14 mg g(-1)) < RB198 (16 mg g(-1)) < NBB (63...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29055249/peptide-nucleic-acid-as-a-selective-recognition-element-for-electrochemical-determination-of-hg-2
#11
Agnieszka Bala, Łukasz Górski
A novel electrochemical PNA-based biosensor for the determination of Hg(2+) is described. The receptor layer, containing single strands of polythymine PNA (peptide nucleic acid), was formed at the surface of gold electrode. Due to the presence of thymine bases and peptide bonds, an interaction between Hg(2+) ion and receptor layer occurs. The influence of chain modification - PNA vs. DNA - and type of redox marker - anionic AQMS-Na (sodium salt of anthraquinone-2-sulfonic acid) and Fe(II/III) (potassium ferri/ferrocyanide) or cationic MB (methylene blue) and RuHex (hexaammineruthenium(III) chloride) - were studied...
October 12, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/29053053/methylene-chloride
#12
Jennan A Phillips
Methylene chloride is an industrial solvent used in commercial paint strippers and degreasing agents. This chemical is widely used in consumer products, yet without appropriate protections, exposure may lead to death. Already banned in some countries, the Environmental Protection Agency (EPA) recently proposed limiting its use in the United States.
October 1, 2017: Workplace Health & Safety
https://www.readbyqxmd.com/read/29051455/fate-of-chloromethanes-in-the-atmospheric-environment-implications-for-human-health-ozone-formation-and-depletion-and-global-warming-impacts
#13
REVIEW
Wen-Tien Tsai
Among the halogenated hydrocarbons, chloromethanes (i.e., methyl chloride, CH₃Cl; methylene chloride, CH₂Cl₂; chloroform, CHCl₃; and carbon tetrachloride, CCl₄) play a vital role due to their extensive uses as solvents and chemical intermediates. This article aims to review their main chemical/physical properties and commercial/industrial uses, as well as the environment and health hazards posed by them and their toxic decomposition products. The environmental properties (including atmospheric lifetime, radiative efficiency, ozone depletion potential, global warming potential, photochemical ozone creation potential, and surface mixing ratio) of these chlorinated methanes are also reviewed...
September 21, 2017: Toxics
https://www.readbyqxmd.com/read/29048492/stability-indicating-uplc-and-tlc-densitometric-methods-for-determination-of-benztropine-mesylate-and-its-carcinogenic-degradation-product
#14
Michel Y Fares, Nada S Abdelwahab, Maha M Abdelrahman, Hamdy M Abdel-Rahman
Two accurate, precise and highly selective stability-indicating methods were adopted for simultaneous determination of benztropine mesylate (BNZ) in presence of its hepatotoxic and carcinogenic degradation product, benzophenone (BPH) either in pure form or in the pharmaceutical formulation without any preliminary separation steps. The first method is a thin layer chromatography (TLC)-densitometric method that depended on separation of BNZ from its degradate on TLC aluminum plates precoated with silica gel 60 F254 as the stationary phase using a developing system consisted of hexane:methylene chloride:triethylamine (5:5:0...
October 1, 2017: Journal of Chromatographic Science
https://www.readbyqxmd.com/read/29019852/modification-of-tracheal-cuff-shape-and-continuous-cuff-pressure-control-to-prevent-microaspiration-in-an-ex-vivo-pig-tracheal-two-lung-model
#15
Antoine Monsel, Marine Le Corre, Romain Deransy, Hélène Brisson, Charlotte Arbelot, Qin Lu, Jean-Louis Golmard, Olivier Langeron, Jean-Jacques Rouby
OBJECTIVES: Microaspiration of subglottic secretions plays a pivotal role in ventilator-associated pneumonia. Impact of endotracheal tube cuff material and shape on tracheal sealing performance remains debated. The primary objective was to compare the tracheal sealing performance of polyvinyl chloride tapered, cylindrical and spherical cuffs. Secondary objectives were to determine the impact of continuous cuff pressure control on sealing performance and pressure variability. DESIGN: Prospective randomized ex vivo animal study...
December 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28976496/development-of-contractile-properties-in-the-fetal-porcine-urinary-bladder
#16
Lotte K Jakobsen, Karina F Trelborg, Ulf Simonsen, Karl-Erik Andersson, L H Olsen
BackgroundIn early fetal life, the bladder is merely a conduit allowing urine to pass through freely into the amniotic cavity. As the striated external urethral sphincter evolves, the bladder acquires its reservoir and voiding functions. We characterized the myogenic and neurogenic contractions of the normal fetal porcine bladder from midterm until close to full-term gestation.MethodsContractile responses were measured in vitro using bladder strips from fetuses at 60 (N=23) and 100 days (N=21) of gestation...
October 4, 2017: Pediatric Research
https://www.readbyqxmd.com/read/28948260/nonmetallic-carbon-monoxide-releasing-molecules-corms
#17
REVIEW
Nawodi Abeyrathna, Kenyatta Washington, Christopher Bashur, Yi Liao
Carbon monoxide (CO) is a gasotransmitter that plays important roles in regulating cell functions and has shown therapeutic effects in clinic studies. CO releasing molecules (CORMs), which allow controlled release of CO in physiological conditions, have been intensively studied in the past decade. While most CORMs are metal complexes, several nonmetallic CORMs have also been developed and most of them were reported in recent years. The major advantages of nonmetallic CORMs are potentially low toxicity and easy modification for property tuning...
October 25, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28855945/synthesis-and-antimicrobial-evaluation-of-some-2-5-disubstituted-1-3-4-oxadiazole-derivatives
#18
Elham Jafari, Tahereh Mohammadi, Ali Jahanian-Najafabadi, Farshid Hassanzadeh
1,3,4-oxadiazoles are interesting compounds because of their valuable biological effects such as cytotoxic, antibacterial, antifungal, and anti-tubercular activities. Ethyl mandelate was treated with hydrazine hydrate to yield the corresponding acylhydrazide. Some of the 2,5 disubstituted 1,3,4-oxadiazole derivatives were prepared from acylhydrazide using three different procedures. In the first procedure, acylhydrazide was reacted with nitro or chloro aroyle chloride to afford a diacylhydrazide which was cyclized to 2,5-disubstituted 1,3,4-oxadiazole in the presence of phosphoryl chloride as dehydrating agent...
August 2017: Research in Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28851642/cu-nanoparticles-synthesis-using-biological-molecule-of-p-granatum-seeds-extract-as-reducing-and-capping-agent-growth-mechanism-and-photo-catalytic-activity
#19
Nosheen Nazar, Ismat Bibi, Shagufta Kamal, Munawar Iqbal, Shazia Nouren, Kashif Jalani, Muhammad Umair, Sadia Atta
In view of extended applications of nanoparticles, the nanoparticles synthesis is an extensive research field and green synthesis is one of the co-friendly methodologies. Plant extract mediated synthesis of nanoparticles has gained much attention in current decade. In current investigation, copper nanoparticles (CuNPs) were prepared using P. granatum seeds extract (biological molecules) from copper(II) chloride salt. The synthesized CuNPs were characterized by UV-Visible spectroscopy, X-ray diffraction measurements (XRD), scanning electron microscopy (SEM), Energy Dispersive X- Ray Spectroscopy (EDX), Fourier transform infra-red spectroscopy (FTIR) and atomic force microscopy techniques...
August 26, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28840613/characterizing-and-eliminating-errors-in-enhancement-and-subtraction-artifacts-in-dynamic-contrast-enhanced-breast-mri-chemical-shift-artifact-of-the-third-kind
#20
Jamal J Derakhshan, Elizabeth S McDonald, Evan S Siegelman, Mitchell D Schnall, Felix W Wehrli
PURPOSE: To characterize errors in enhancement in breast dynamic contrast-enhanced (DCE) MRI studies as a function of echo time and determine the source of dark band artifacts in clinical subtraction images. METHODS: Computer simulations, oil and water substitute (methylene chloride), as well as an American College of Radiology quality control phantom were tested. Routine clinical DCE breast MRI study was bracketed with (accelerated) in-phase DCE acquisitions in five patients...
August 24, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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