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https://www.readbyqxmd.com/read/29340385/coordination-supramolecular-assemblies-of-a-monohydroxycucurbit-7-uril-and-their-potential-applications-in-gas-sorption
#1
Rui Han Gao, Zi-Yi Hua, Kai Chen, Jing Xu, Qian-Jiang Zhu, Zhu Tao, Jiang-Lin Zhao
Coordination supramolecular assemblies of monohydroxycucurbit[7]uril ((HO)Q[7]) with alkaline earth metal ions (AE2+) have been formed in aqueous HCl solution in the presence of tetrachloride cadmium anions ([CdCl4]2-) as a structure directing agent. The driving force for the assembly could be attributed to the interaction of the positive electro-potential outer-surface of (HO)Q[7] molecules with [CdCl4]2- anions and ionic dipole interaction of the hydroxyl of (HO)Q[7] molecules with [CdCl4]2- anions. Moreover, the porous structure of the (HO)Q[7]/AE2+-based coordination supramolecular assemblies could result in potential applications in the selective sorption of polar volatile organic molecules, which may be useful in molecular sieves, sensors, absorption and separation...
January 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29339306/morphological-changes-of-bacterial-cells-upon-exposure-of-silver-silver-chloride-nanoparticles-synthesized-using-agrimonia-pilosa
#2
Maheshkumar Prakash Patil, Yong Bae Seo, Gun-Do Kim
Facile, eco-friendly synthesis of metal nanoparticles has been proposed as a cost effective method. In the present study, we propose the facile synthesis of silver-silver chloride (Ag-AgCl) nanoparticles (NPs) using the medicinally important Agrimonia pilosa plant extract without addition of capping or stabilizing agents. The Ag-AgCl NPs synthesis was observed at 40 °C after 10 min incubation; the synthesis of Ag-AgCl NPs was indicated by color change and confirmed by UV-vis spectroscopic peak at 454 nm...
January 12, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29330687/evaluation-of-the-mitochondria-related-redox-and-bioenergetics-effects-of-gastrodin-in-sh-sy5y-cells-exposed-to-hydrogen-peroxide
#3
Marcos Roberto de Oliveira, Flávia Bittencourt Brasil, Cristina Ribas Fürstenau
Mitochondrion is the main site of ATP production in animal cells and also orchestrates signaling pathways associated with cell survival and death. Mitochondrial dysfunction has been linked to bioenergetics and redox impairment in human diseases, such as neurodegeneration and cardiovascular disease. Protective agents able to attenuate mitochondrial impairment are of pharmacological interest. Gastrodin (GAS; 4-hydroxybenzyl alcohol 4-O-beta-D-glucoside) is a phenolic glucoside obtained from the Chinese herbal medicine Gastrodia elata Blume and exhibits antioxidant, anti-inflammatory, and antiapoptotic effects in several cell types...
January 12, 2018: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29329229/chemical-composition-and-evaluation-of-the-biological-properties-of-the-essential-oil-of-the-dietary-phytochemical-lippia-citriodora
#4
Eleni Fitsiou, Gregoria Mitropoulou, Katerina Spyridopoulou, Manolis Vamvakias, Haido Bardouki, Alex Galanis, Katerina Chlichlia, Yiannis Kourkoutas, Mihalis Ι Panayiotidis, Aglaia Pappa
The aim of the study was to characterize the chemical composition and biological properties of the essential oil from the plant Lippia citriodora grown in Greece. The essential oil volatiles were analyzed by gas chromatography-mass spectrometry GC-MS indicating citral as the major component. Τhe antimicrobial properties were assayed using the disk diffusion method and the minimum inhibitory and non-inhibitory concentration values were determined. Listeria monocytogenes, Staphylococcus epidermidis, Staphylococcus aureus, Saccharomyces cerevisiae, and Aspergillus niger were sensitive to Lippia citriodora oil, but not Escherichia coli, Salmonella Enteritidis, Salmonella typhimurium, and Pseudomonas fragi...
January 12, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29324716/the-effects-of-a-macromolecular-charring-agent-with-gas-phase-and-condense-phase-synergistic-flame-retardant-capability-on-the-properties-of-pp-ifr-composites
#5
Hongda Chen, Jihui Wang, Aiqing Ni, Anxin Ding, Xia Han, Ziheng Sun
In order to improve the efficiency of intumescent flame retardants (IFRs), a novel macromolecular charring agent named poly(ethanediamine-1,3,5-triazine-p-4-amino-2,2,6,6-tetramethylpiperidine) (PETAT) with gas phase and condense phase synergistic flame-retardant capability was synthesized and subsequently dispersed into polypropylene (PP) in combination with ammonium polyphosphate (APP) via a melt blending method. The chemical structure of PETAT was investigated by Fourier transform infrared spectroscopy (FTIR), and ¹H nuclear magnetic resonance (NMR) spectroscopy...
January 11, 2018: Materials
https://www.readbyqxmd.com/read/29318511/midazolam-efficacy-against-acute-hydrogen-sulfide-induced-mortality-and-neurotoxicity
#6
Poojya Anantharam, Dong-Suk Kim, Elizabeth M Whitley, Belinda Mahama, Paula Imerman, Piyush Padhi, Wilson K Rumbeiha
Hydrogen sulfide (H2S) is a colorless, highly neurotoxic gas. It is not only an occupational and environmental hazard but also of concern to the Department of Homeland Security for potential nefarious use. Acute high-dose H2S exposure causes death, while survivors may develop neurological sequelae. Currently, there is no suitable antidote for treatment of acute H2S-induced neurotoxicity. Midazolam (MDZ), an anti-convulsant drug recommended for treatment of nerve agent intoxications, could also be of value in treating acute H2S intoxication...
January 9, 2018: Journal of Medical Toxicology: Official Journal of the American College of Medical Toxicology
https://www.readbyqxmd.com/read/29318304/prediction-of-physico-chemical-properties-of-bacteriostatic-n1-substituted-sulfonamides-theoretical-and-experimental-studies
#7
Hossein Nikoofard, Mohsen Sargolzaei, Farnosh Faridbod
A computational study at the density functional theory (DFT) as well as electrochemical methods, was carried out on the structural and physico-chemical properties of a series of sulfonamide derivatives (SAs) as WHO essential medications in the treatment of basic health system. The B3LYP/6-311++G(d,p) level of theory carried out on sulfadiazine (SDZ), sulfathiazole (STZ), sulfaquinoxaline (SQX), sulfacetamide (SAA), and the reference unsubstituted sulfonamide (SA) was discussed and rationalized in term of the N1-sulfonamide substituent...
December 2017: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/29315308/mac-sparing-effect-of-nitrous-oxide-in-sevoflurane-anesthetized-sheep-and-its-reversal-with-systemic-atipamezole-administration
#8
Lauren Duffee, Nicolò Columbano, Antonio Scanu, Valentino Melosu, Giovanni Mario Careddu, Giovanni Sotgiu, Bernd Driessen
INTRODUCTION: Nitrous oxide (N2O) is an anesthetic gas with antinociceptive properties and reduces the minimum alveolar concentration (MAC) for volatile anesthetic agents, potentially through mechanisms involving central alpha2-adrenoceptors. We hypothesized that 70% N2O in the inspired gas will significantly reduce the MAC of sevoflurane (MACSEVO) in sheep, and that this effect can be reversed by systemic atipamezole. MATERIALS AND METHODS: Animals were initially anesthetized with SEVO in oxygen (O2) and exposed to an electrical current as supramaximal noxious stimulus in order to determine MACSEVO (in duplicates)...
2018: PloS One
https://www.readbyqxmd.com/read/29314056/stable-isotope-labeling-assisted-gc-ms-ms-method-for-determination-of-methyleugenol-in-food-samples
#9
Jincheng Li, Huan Liu, Chaoying Wang, Jien Yang, Gang Han
BACKGROUND: Methyleugenol is a common phenylpropanoid compound found in many plant and has been widely used as a flavoring agent in people's daily life. In the present study, a stable isotope dilution assay gas chromatography-triple quadrupole mass spectrometry (SIDA-GC-MS/MS) method was developed for quantitative determination of methyleugenol in food samples. Methyleugenol-D3 was synthesized and used as an isotope internal standard for the determination of methyleugenol. QuEChERS (quick, easy, cheap, effective, rugged, and safe) method was applied to the clean-up of food sample extracts...
January 4, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29310311/determination-of-free-and-total-sulfur-iv-compounds-in-coconut-water-using-high-resolution-continuum-source-molecular-absorption-spectrometry-in-gas-phase
#10
Michael L Oliveira, Geovani C Brandao, Jailson B de Andrade, Sergio L C Ferreira
This work proposes a method for the determination of free and total sulfur(IV) compounds in coconut water samples, using the high-resolution continuum source molecular absorption spectrometry. It is based on the measurement of the absorbance signal of the SO2 gas generate, which is resultant of the addition of hydrochloric acid solution on the sample containing the sulfating agent. The sulfite bound to the organic compounds is released by the addition of sodium hydroxide solution, before the generation of the SO2 gas...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29306845/determination-of-membrane-disruption-and-genomic-dna-binding-of-cinnamaldehyde-to-escherichia-coli-by-use-of-microbiological-and-spectroscopic-techniques
#11
Tian-Fu He, Zhi-Hong Zhang, Xin-An Zeng, Lang-Hong Wang, Charles S Brennan
This work was aimed to investigate the antibacterial action of cinnamaldehyde (CIN) against Escherichia coli ATCC 8735 (E. coli) based on membrane fatty acid composition analysis, alterations of permeability and cell morphology as well as interaction with genomic DNA. Analysis of membrane fatty acids using gas chromatography-mass spectrometry (GC-MS) revealed that the proportion of unsaturated fatty acids (UFA) and saturated fatty acids (SFA) were the major fatty acids in plasmic membrane, and their levels were significantly changed after exposure of E...
November 10, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29303026/risk-factors-for-impaired-pulmonary-function-and-cardiorespiratory-fitness-in-very-long-term-adult-survivors-of-childhood-acute-lymphoblastic-leukemia-after-treatment-with-chemotherapy-only
#12
Ole Henrik Myrdal, Adriani Kanellopoulos, Jon R Christensen, Ellen Ruud, Elisabeth Edvardsen, Johny Kongerud, Liv Ingunn Sikkeland, May B Lund
BACKGROUND: Survivors of childhood acute lymphoblastic leukemia (ALL) are at risk of late treatment-related side-effects. Data regarding prevalence and risk factors for impairments in pulmonary function and cardiorespiratory fitness are limited, and reported findings are inconsistent and inconclusive. MATERIAL AND METHODS: In a cross-sectional study, 116 ALL survivors (median 5 years at diagnosis, 29 years at follow-up, 53% females) were examined, median 23 years after treatment with chemotherapy only...
January 5, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29302624/chemical-composition-and-antifungal-effect-of-hydroalcoholic-extract-of-allium-tripedale-tvautv-against-candida-species
#13
M Shirani, A Samimi, H Kalantari, M Madani, A Kord Zanganeh
Background and Purpose: Treatment of life-threatening fungal infections caused by Candida species has become a major problem. Candida spp. are the most important causative agents of candidiasis. Allium tripedale is a medicinal plant that has been traditionally used to treat infections. In the present study, we aimed to determine the chemical compounds and antimicrobial activity of hydroalcoholic extract of A. tripedale against different species of Candida. Materials and Methods: Phytochemical analysis was performed to identify the possible bioactive components of this extract by using gas chromatography and mass spectroscopy (GC-MS)...
March 2017: Advances in Medical Mycology (Iran)
https://www.readbyqxmd.com/read/29302044/the-pertinence-of-sutton-s-law-to-exposure-science-lessons-from-unconventional-shale-gas-drilling
#14
REVIEW
Bernard D Goldstein
Sutton's Law urges the medical practitioner to utilize the test that goes directly to the problem. When applied to exposure science, Sutton's Law would argue that the major emphasis should be on techniques that directly measure exposure in or close to the human, animal or ecosystem receptors of concern. Exposure science largely and appropriately violates Sutton's Law by estimating exposure based on information on emissions or measurements obtained at a distance from the receptors of concern. I suggest four criteria to help determine whether Sutton's law should be violated for an innovative technology, and explore these criteria in relation to potential human exposure resulting from unconventional gas drilling (UGD): (1) The technological processes possibly leading to release of the chemical or physical agents of concern are reasonably understood; (2) the agents of concern are known; (3) the source and geographical location of the releases can be reasonably identified; and (4) there is information about the likely temporal pattern of the releases and resulting pollutant levels in relation to the temporal patterns of receptor susceptibility...
January 4, 2018: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/29300079/chemodosimeter-for-selective-and-sensitive-chromogenic-and-fluorogenic-detection-of-mustard-gas-for-real-time-analysis
#15
Vinod Kumar, Hemlata Rana, G Raviraju, Arvind K Gupta
Since the first use of chemical warfare agents (CWA) (1915) to the recent attacks in Syria (2017) on mankind, there have been many incidents where CWA have claimed thousands of lives and left many more contaminated. In order to provide the appropriate and immediate medical counter measure to the victims, the exact classification of these chemical agents within few minutes on the field itself using a rapid and simple detection technique is extremely important to save the lives of the effected people. This has motivated all of us to explore the novel strategies/detection systems that can be field deployable with better selectivity and greater sensitivity...
January 4, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29300010/acoustic-reporter-genes-for-noninvasive-imaging-of-microorganisms-in-mammalian-hosts
#16
Raymond W Bourdeau, Audrey Lee-Gosselin, Anupama Lakshmanan, Arash Farhadi, Sripriya Ravindra Kumar, Suchita P Nety, Mikhail G Shapiro
The mammalian microbiome has many important roles in health and disease, and genetic engineering is enabling the development of microbial therapeutics and diagnostics. A key determinant of the activity of both natural and engineered microorganisms in vivo is their location within the host organism. However, existing methods for imaging cellular location and function, primarily based on optical reporter genes, have limited deep tissue performance owing to light scattering or require radioactive tracers. Here we introduce acoustic reporter genes, which are genetic constructs that allow bacterial gene expression to be visualized in vivo using ultrasound, a widely available inexpensive technique with deep tissue penetration and high spatial resolution...
January 3, 2018: Nature
https://www.readbyqxmd.com/read/29297760/silk-fibroin-porous-scaffolds-by-n2o-foaming
#17
Devid Maniglio, Walter Bonani, Claudio Migliaresi, Antonella Motta
Silk fibroin has acquired increasing interest for biomedical applications, and namely for the fabrication of scaffolds for tissue engineering, because of its highly positive biological interaction and the possibility to adapt the material to several application requirements by adopting different fabrication methods, in order to make films, sponges, fibers, nets or gels with predictable degradation times. For tissue engineering, in most cases porous scaffolds are required, in some cases possibly in situ forming and therefore fabricated in mild body-compatible conditions...
January 3, 2018: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/29296667/cooperative-co2-absorption-isotherms-from-a-bifunctional-guanidine-and-bifunctional-alcohol
#18
Rachel Steinhardt, Stanley C Hiew, Hemakesh Mohapatra, Du Nguyen, Zachary Oh, Richard Truong, Aaron Esser-Kahn
Designing new liquids for CO2 absorption is a challenge in CO2 removal. Here, achieving low regeneration energies while keeping high selectivity and large capacity are current challenges. Recent cooperative metal-organic frameworks have shown the potential to address many of these challenges. However, many absorbent systems and designs rely on liquid capture agents. We present herein a liquid absorption system which exhibits cooperative CO2 absorption isotherms. Upon introduction, CO2 uptake is initially suppressed, followed by an abrupt increase in absorption...
December 27, 2017: ACS Central Science
https://www.readbyqxmd.com/read/29295966/analysis-of-volatile-organic-compounds-in-the-breath-of-patients-with-stable-or-acute-exacerbation-of-chronic-obstructive-pulmonary-disease
#19
Alex Pizzini, Wojciech Filipiak, Johannes Wille, Clemens Ager, Helmut Wiesenhofer, Robert Kubinec, Jaroslav Blasko, Christoph Tschurtschenthaler, Christopher A Mayhew, Günter Weiss, Rosa Bellmann-Weiler
Chronic obstructive pulmonary disease (COPD) is a major cause of death worldwide. Acute exacerbations (AECOPD), caused by infectious and non-infectious agents, contribute to an increase in mortality. The diagnostic procedure of AECOPD is mainly based on clinical features. The aim of this pilot study was to identify whether volatile organic compounds (VOCs) in breath could be used to discriminate for acute exacerbated COPD. Three patient groups were included in this controlled study: AECOPD patients (n= 14, age mean ± SD: 71...
January 3, 2018: Journal of Breath Research
https://www.readbyqxmd.com/read/29288916/high-efficient-detoxification-of-mustard-gas-surrogate-based-on-nanofibrous-fabric
#20
Yuebo Liu, Xinyu Du, Jiaona Wang, Yingying Yin, Bin Wang, Shuyu Zhao, Nianwu Li, Congju Li
In recent years, people pay more attention to the protection against chemical warfare agents, due to the increase in the probability of usage of these chemical warfare agents in wars or terrorist attacks. In this work, MgO nanoparticles were in-situ growth on the surface of poly(m-phenylene Isophthalamide) (PMIA) forming a flexible and breathable fabric for the detoxification of mustard gas surrogate. The as-prepared nanofibrous membrane possesses a "flower-like" structure of which endows not only increase the specific surface area of the composite but also prevent the agglomeration of the MgO nanoparticles...
December 16, 2017: Journal of Hazardous Materials
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