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https://www.readbyqxmd.com/read/28823100/-1s-3r-cis-chrysanthemyl-tiglate-sex-pheromone-of-the-striped-mealybug-ferrisia-virgata
#1
Jun Tabata, Ryoko T Ichiki
Derivatives of 2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecarboxylic acid (chrysanthemic acid) are classic natural pyrethroids discovered in pyrethrum plants and show insecticidal activity. Chrysanthemic acid, with two asymmetric carbons, has four possible stereoisomers, and most natural pyrethroids have the (1R,3R)-trans configuration. Interestingly, chrysanthemic acid-related structures are also found in insect sex pheromones; carboxylic esters of (1R,3R)-trans-(2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropyl)methanol (chrysanthemyl alcohol) have been reported from two mealybug species...
August 19, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/28822874/spray-drying-ternary-amorphous-solid-dispersions-of-ibuprofen-an-investigation-into-critical-formulation-and-processing-parameters
#2
Ahmad Ziaee, Ahmad B Albadarin, Luis Padrela, Alexandra Faucher, Emmet O'Reilly, Gavin Walker
A design of experiment (DoE) approach was used to investigate the critical formulation and processing parameters in spray drying ternary amorphous solid dispersions (ASDs) of ibuprofen. A range of 16 formulations of ibuprofen, HPMCP-HP55 and Kollidon VA 64 were spray dried. Statistical analysis revealed the interrelation of various spray drying process conditions and formulation factors, namely solution feed rate, inlet temperature, Active Pharmaceutical Ingredient (API)/excipients ratio and dichloromethane (DCM) /methanol (MeOH) ratio...
August 16, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28822705/anti-dermatophyte-activity-of-leguminosae-plants-from-southern-brazil-with-emphasis-on-mimosa-pigra-leguminosae
#3
C B de Morais, M Scopel, G P R Pedrazza, F K da Silva, D F Dalla Lana, M L Tonello, S T S Miotto, M M Machado, L F S De Oliveira, A M Fuentefria, J A S Zuanazzi
BACKGROUND: Intensive prophylactic use of antifungals leads to the increase of drug resistance and the need for new and more effective treatments are real. Plants from Leguminosae family are rich in flavonoids, for which numerous biological activities have been described, including antifungal effects. PURPOSE: To screen methanolic extracts from Leguminosae species looking for alternative sources for antifungal agents (anti-dermatophyte and anti-Candida) and their innocuity...
August 16, 2017: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/28822157/-the-analysis-of-multivariate-image-and-chemometrics-in-tlc-fingerprinting-of-artificial-cow-bezoar
#4
Ling-Wen Yao, Yan Shi, Dong-Mei Sun, Xian-Long Cheng, Feng Wei, Shuang-Cheng Ma
A method of thin-layer fingerprinting chromatogram of artificial cow-bezoar was established with the developing solvent consisting of cyclohexane, ethyl acetate, acetic acid and methanol (2∶7∶1∶2), and 10% sulfuric acid ethanol solution sprayed as colour-developing agent. After heated at 105 ℃, TLC was recorded as an image in ultraviolet light at 366 nm which was converted into grayscale. By the gray value extracted from the grayscale, the multivariate data obtained from TLC of samples could be analyzed by chemometric method...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822156/-hplc-ms-ms-determination-of-residual-amount-of-4-plant-growth-retardants-in-6-dried-root-and-rhizome-herbs
#5
Yu-Yao Zhai, Bao-Lin Guo
HPLC-MS/MS was applied to the determination of residual amount of plant growth retardant such as paclobutrazol, daminozide, chlormequat and mepiquat chloride in dried root and rhizome herbs. The sample was extracted twice with acetonitrile containing 0.1% formic acid. The separation was performed on a Waters Atlantis HILIC column with an elution system consisting of acetonitrile-5 mmol•L⁻¹ ammonium acetate solution with 0.1% formic acid, methanol and acetonitrile. The MS spectrum was acquired in positive mode with multiple reactions monitoring (MRM)...
June 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/28822027/impact-of-orientation-and-flexibility-of-peptide-linkers-on-t-maritima-lipase-tm1350-displayed-on-bacillus-subtilis-spores-surface-using-cotb-as-fusion-partner
#6
Jawad Ullah, Huayou Chen, Ake Vastermark, Jinru Jia, Bangguo Wu, Zhong Ni, Yilin Le, Hongcheng Wang
Fusion protein construction often requires peptide linkers for prolonged conformation, extended stability and enzyme activity. In this study a series of fusion between Thermotoga maritima lipase Tm1350 and Bacillus subtillis coat protein CotB, comprising of several peptide linkers, with different length, flexibility and orientations were constructed. Effects of temperature, pH and chemicals were examined, on the activity of displayed enzyme. The fusion protein with longer flexible linkers L9 [(GGGGS)4] and L7 (GGGGS-GGGGS-EAAAK-EAAAK-GGGGS-GGGGS) possess 1...
August 18, 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28820592/copper-i-no-g-reductive-coupling-producing-a-trans-hyponitrite-bridged-dicopper-ii-complex-redox-reversal-giving-copper-i-no-g-disproportionation
#7
Gayan B Wijeratne, Shabnam Hematian, Maxime A Siegler, Kenneth D Karlin
A copper complex, [CuI(tmpa)(MeCN)]+, effectively reductively couples NO(g) at RT in methanol, giving a structurally characterized hyponitrito-dicopper(II) adduct. Hydrogen-bonding from MeOH is critical for the hyponitrite complex formation and stabilization. This complex exhibits the reverse redox process in aprotic solvents, giving CuI + NO, leading to CuI-mediated NO disproportionation. The relation-ship of this chemistry to biological iron and/or copper mediated NO reductive coupling to give N2O(g) is discussed...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820222/quasi-zero-dimensional-cobalt-doped-ceo2-dots-on-pd-catalysts-for-alcohol-electro-oxidation-with-enhanced-poisoning-tolerance
#8
Qiang Tan, Haiyan Zhu, Shengwu Guo, Yuanzhen Chen, Tao Jiang, Chengyong Shu, Shaokun Chong, Benjamin Hultman, Yongning Liu, Gang Wu
Deactivation of an anode catalyst resulting from the poisoning of COad-like intermediates is one of the major problems for methanol and ethanol electro-oxidation reactions (MOR & EOR), and remains a grand challenge towards achieving high performance for direct alcohol fuel cells (DAFCs). Herein, we report a new approach for the preparation of ultrafine cobalt-doped CeO2 dots (Co-CeO2, d = 3.6 nm), which can be an effective anti-poisoning promoter for Pd catalysts towards MOR and EOR in alkaline media. Compared to Pd/CeO2 and pure Pd, the hybrid Pd/Co-CeO2 nanocomposite catalyst exhibited a much enhanced activity and remarkable anti-poisoning ability for both MOR and EOR...
August 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28820107/ogataea-neixiangensis-sp-nov-and-ogataea-paraovalis-f-a-sp-nov-two-methanol-assimilating-yeast-species-isolated-from-rotting-wood
#9
Yun-Feng Lu, Min Wang, Jun Zheng, Feng-Li Hui
Four yeast strains were isolated from rotting wood samples collected in the Baotianman Nature Reserve in Henan Province, central China. The sequences of the D1/D2 domains of the large subunit rRNA gene and the internal transcribed spacer regions showed that these four strains represent two different undescribed yeast species belonging to the Ogataea clade. Ogataea neixiangensis sp. nov. produces two to four hat-shaped ascospores per ascus, and its closest relative among recognized species is Candida nitratophila...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28818728/fractionation-of-lignin-macromolecules-by-sequential-organic-solvents-systems-and-their-characterization-for-further-valuable-applications
#10
Shin Young Park, Jae-Young Kim, Hye Jung Youn, Joon Weon Choi
Lignin solvent fractionation is one of the promising methods for homogenizing and utilizing lignin commercially. In this work, fractionation characteristics of two lignin fractions were compared to investigate the potential of utilization of fractionated lignin. Two lignins [milled wood lignin(MWL) and organosolv lignin(OL) from yellow poplar] were sequentially fractionated with ethyl acetate(F1), 2-butanone(F2), methanol(F3), acetone(F4), and dioxane/water(F5). Yields of five MWL fractions F1 to F5 were 11...
August 14, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28818657/activity-guided-isolation-and-structural-identification-of-immunomodulating-substances-from-pleurotus-eryngii-byproducts
#11
Yanan Sun, Wenxiang Li
A two-step extraction process was used to investigate the bioactive substances from the byproducts of the fungus Pleurotus eryngii. Methanol extraction followed by extraction using different polar solvents coupled with silica column chromatography was carried out to separate the bioactive components. The immunomodulating activity of the extracts was investigated using Ana-1 mouse macrophage cells. At 25μg/mL, the butyl alcohol extract showed the highest enhancement of Ana-1 cell proliferative activity and secretion of cytokines...
August 14, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28817986/formation-of-artifactual-dmpo-oh-spin-adduct-in-acid-solutions-containing-nitrite-ions
#12
Tetsuya Takayanagi, Hirokazu Kimiya, Tatsushi Ohyama
We investigated aqueous solutions containing nitrite ions and DMPO (5,5-dimethyl-1-pyrroline-N-oxide) by ESR (Electron Spin Resonance) in the pH range from 1 to 6. A DMPO -OH signal was observed below pH 3.0 in the presence of nitrite ions, whereas in the absence of nitrite ion, an extremely weak signal was observed below pH 1.5. Addition of methanol, a hydroxyl radical scavenger, to this system did not lead to the appearance of a detectable DMPO-CH2OH signal. The possibility of this DMPO-OH signal being due to a genuine spin trapping process with hydroxyl radical was therefore ruled out...
August 17, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28817801/a-sensitized-igf1-treatment-restores-corticospinal-axon-dependent-functions
#13
Yuanyuan Liu, Xuhua Wang, Wenlei Li, Qian Zhang, Yi Li, Zicong Zhang, Junjie Zhu, Bo Chen, Philip R Williams, Yiming Zhang, Bin Yu, Xiaosong Gu, Zhigang He
A major hurdle for functional recovery after both spinal cord injury and cortical stroke is the limited regrowth of the axons in the corticospinal tract (CST) that originate in the motor cortex and innervate the spinal cord. Despite recent advances in engaging the intrinsic mechanisms that control CST regrowth, it remains to be tested whether such methods can promote functional recovery in translatable settings. Here we show that post-lesional AAV-assisted co-expression of two soluble proteins, namely insulin-like growth factor 1 (IGF1) and osteopontin (OPN), in cortical neurons leads to robust CST regrowth and the recovery of CST-dependent behavioral performance after both T10 lateral spinal hemisection and a unilateral cortical stroke...
August 16, 2017: Neuron
https://www.readbyqxmd.com/read/28817284/fabrication-of-mesoporous-polystyrene-films-with-controlled-porosity-and-pore-size-by-solvent-annealing-for-templated-syntheses
#14
Mohan Raj Krishnan, Yu-Cheng Chien, Chung-Fu Cheng, Rong-Ming Ho
Herein, we aim to develop a facile method for the fabrication of mesoporous polystyrene (PS) films with controlled porosity and pore size by solvent annealing. A PS polymer film is solvent-annealed using N,N-dimethyl formamide (DMF) vapor for the development of phase separation, followed by rapidly cooling to the preset cryogenic temperature. Subsequently, a nonsolvent (methanol) is introduced to extract the crystalline DMF from the DMF-swollen PS, giving mesoporous PS with a network structure after the removal of DMF...
August 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28816444/mapping-the-intricate-reactivity-of-nanojars-toward-molecules-of-varying-acidity-and-their-conjugate-bases-leading-to-exchange-of-pyrazolate-ligands
#15
Christian K Hartman, Gellert Mezei
A comprehensive reactivity study of nanojars toward 18 different acidic compounds with varying pKa, including 12 different carboxylic acids (both aliphatic and aromatic mono- and dicarboxylic acids), p-toluenesulfonic acid, hydrogen sulfate, hydrogen carbonate, carbonic acid, 1-decanethiol, and methanol, as well as four different conjugate bases (formate, acetate, benzoate, 2-bromoethanesulfonate) is carried out with the aid of electrospray-ionization mass spectrometry. Thus, the effect on nanojar substitution and breakdown pattern of a number of variables, such as concentration of reagent (acid or conjugate base), acidity of reagent (pKa), effect of acid vs conjugate base, steric effects, aromaticity, incarcerated anion and size of the nanojar, is evaluated...
August 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28816397/a-flow-through-column-electrolytic-cell-for-supercritical-fluid-chromatography
#16
Kazuhiro Yamamoto, Tatsuya Ueki, Naoyuki Higuchi, Kouji Takahashi, Akira Kotani, Hideki Hakamata
A novel flow-through column electrolytic cell was proposed as a detector to obtain current signals for supercritical fluid chromatography. The electrochemical cell consisted of two electrodes and its holder, and a working and a counter electrode were fabricated from 192 carbon strings, which were composed of 400 carbon fibers of 10 μm in diameter filled into a heat-shrinkable tube. These electrodes were placed in the center of a holder made from polyether ether ketone blocks and they were separated by polytetrafluoroethylene membrane filters...
August 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28816372/in-vitro-antitubercular-activity-of-3-deoxysappanchalcone-isolated-from-the-heartwood-of-caesalpinia-sappan-linn
#17
Hoonhee Seo, Sukyung Kim, Hafij Al Mahmud, Md Imtiazul Islam, Kung-Woo Nam, Byung-Eui Lee, Hanna Lee, Myoung-Lae Cho, Heung-Mook Shin, Ho-Yeon Song
Responsible for nearly 1.5 million deaths every year, the infectious disease tuberculosis remains one of the most serious challenges to global health. The emergence of multidrug-resistant tuberculosis and, more recently, extensively drug-resistant tuberculosis poses a significant threat in our effort to control this epidemic. New drugs are urgently needed to combat the growing threat of antimicrobial resistance. To achieve this goal, we screened approximately 500 species of medicinal plant methanol extracts and their solvent partitioned fractions for potential inhibitors of Mycobacterium tuberculosis growth...
August 17, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28816008/lactuca-capensis-reverses-memory-deficits-in-a%C3%AE-1-42-induced-an-animal-model-of-alzheimer-s-disease
#18
Paula Alexandra Postu, Jaures A K Noumedem, Oana Cioanca, Monica Hancianu, Marius Mihasan, Mitica Ciorpac, Dragos Lucian Gorgan, Brindusa Alina Petre, Lucian Hritcu
We investigated the neuropharmacological effects of the methanolic extract from Lactuca capensis Thunb. leaves (100 and 200 mg/kg) for 21 days on memory impairment in an Alzheimer's disease (AD) rat model produced by direct intraventricular delivery of amyloid-β1-42 (Aβ1-42). Behavioural assays such as Y-maze and radial arm maze test were used for assessing memory performance. Aβ1-42 decreased cognitive performance in the behavioural tests which were ameliorated by pre-treatment with the methanolic extract...
August 16, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28815945/development-of-a-quantitative-method-for-the-analysis-of-cocaine-analogue-impregnated-into-textiles-by-raman-spectroscopy
#19
Linda Xiao, Rhiannon Alder, Megha Mehta, Nadine Krayem, Bianca Cavasinni, Sean Laracy, Shane Cameron, Shanlin Fu
Cocaine trafficking in the form of textile impregnation is routinely encountered as a concealment method. Raman spectroscopy has been a popular and successful testing method used for in situ screening of cocaine in textiles and other matrices. Quantitative analysis of cocaine in these matrices using Raman spectroscopy has not been reported to date. This study aimed to develop a simple Raman method for quantifying cocaine using atropine as the model analogue in various types of textiles. Textiles were impregnated with solutions of atropine in methanol...
August 16, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28815236/ring-closing-metathesis-of-unprotected-peptides
#20
Ellen C Gleeson, W Roy Jackson, Andrea J Robinson
An efficient and expedient route to the synthesis of dicarba peptides from protecting group-free sequences is reported using Ru-alkylidene catalysed olefin metathesis. A range of cyclic peptides was prepared from linear peptides containing two Z-crotyl glycine residues. Free amine groups were masked as salts with Brønsted acids preventing in situ catalyst decomposition. Excellent RCM conversion was obtained in both DMF and methanol.
August 17, 2017: Chemical Communications: Chem Comm
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