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https://www.readbyqxmd.com/read/28346994/gc-ms-analysis-and-potential-cytotoxic-activity-of-calyptranthes-grandifolia-o-berg-calyptranthes-tricona-d-legrand-and-myrciaria-plinioides-d-legrand-essential-oil-in-raw264-7-and-cho-k1-cells
#1
D Faleiro, S M Immich, F Majolo, L Mayer, E M Ethur, M I Goettert
The search for new bioactive substances derived from natural products is daily growing. Among biologically active products used in therapeutic approaches, essential oils are described with wide range of therapeutic and pharmacological potential. Plants from Myrtaceae family have the presence of essential oils in its composition. Calyptranthes grandifolia, Calyptranthes tricona and Myrciaria plinioides species belong to this family and are used by the local population. However, there are no reports in the literature describing relevant characteristics about the potential and possible activities of these species...
March 22, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28346829/polymorphisms-in-the-glucocorticoid-receptor-gene-and-associations-with-glucocorticoid-induced-avascular-osteonecrosis-of-the-femoral-head
#2
Zhanqin Zhao, Yun Xue, Dun Hong, Hongjun Zhang, Zhigang Hu, Shunwu Fan, Haixiao Chen
AIMS: Individual sensitivity to glucocorticoid (GC) therapy might play a pivotal role in the development of GC-induced avascular necrosis of the femoral head (GANFH). In a growing number of studies, common polymorphisms of the glucocorticoid receptor gene (nuclear receptor subfamily 3 group C member 1 [NR3C1]) have been associated with variability in the individual sensitivity to GCs. However, whether the NR3C1 gene polymorphisms actually influence the susceptibility of GANFH remains unknown...
March 27, 2017: Genetic Testing and Molecular Biomarkers
https://www.readbyqxmd.com/read/28346517/cd22-is-required-for-formation-of-memory-b-cell-precursors-within-germinal-centers
#3
Craig P Chappell, Kevin E Draves, Edward A Clark
CD22 is a BCR co-receptor that regulates B cell signaling, proliferation and survival and is required for T cell-independent Ab responses. To investigate the role of CD22 during T cell-dependent (TD) Ab responses and memory B cell formation, we analyzed Ag-specific B cell responses generated by wild-type (WT) or CD22-/- B cells following immunization with a TD Ag. CD22-/- B cells mounted normal early Ab responses yet failed to generate either memory B cells or long-lived plasma cells, whereas WT B cells formed both populations...
2017: PloS One
https://www.readbyqxmd.com/read/28346372/-bligh-and-dyer-and-folch-methods-for-solid-liquid-liquid-extraction-of-lipids-from-microorganisms-comprehension-of-solvatation-mechanisms-and-towards-substitution-with-alternative-solvents
#4
Cassandra Breil, Maryline Abert Vian, Thomas Zemb, Werner Kunz, Farid Chemat
Bligh and Dyer (B & D) or Folch procedures for the extraction and separation of lipids from microorganisms and biological tissues using chloroform/methanol/water have been used tens of thousands of times and are "gold standards" for the analysis of extracted lipids. Based on the Conductor-like Screening MOdel for realistic Solvatation (COSMO-RS), we select ethanol and ethyl acetate as being potentially suitable for the substitution of methanol and chloroform. We confirm this by performing solid-liquid extraction of yeast (Yarrowia lipolytica IFP29) and subsequent liquid-liquid partition-the two steps of routine extraction...
March 27, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28346061/understanding-the-contamination-of-food-with-mineral-oil-the-need-for-a-confirmatory-analytical-and-procedural-approach
#5
Lionel W Spack, Gabriela Leszczyk, Jesus Varela, Hervé Simian, Thomas Gude, Richard H Stadler
The contamination of food by mineral oil hydrocarbons (MOH) found in packaging is a long running concern. A main source of MOH in foods is the migration of mineral oil from recycled board into the packed food products. Consequently, the majority of food manufacturers have taken protective measures, for example by using virgin board instead of recycled fibers, and where feasible, introducing functional barriers to mitigate migration. Despite these protective measures, MOH may still be observed at low amounts in certain food products, albeit due to different entry points across the food supply chain...
March 27, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28345909/rapid-and-simultaneous-analysis-of-360-pesticides-in-brown-rice-spinach-orange-and-potato-using-microbore-gc-ms-ms
#6
Jonghwa Lee, Leesun Kim, Yongho Shin, Junghak Lee, Jiho Lee, Eunhye Kim, Joon-Kwan Moon, Jeong-Han Kim
A multi-residue method for simultaneous and rapid analysis of 360 pesticides in representative agricultural produce (brown rice, orange, spinach, and potato) was developed using a modified QuEChERS procedure combined with gas chromatography tandem mass spectrometry (GC-MS/MS). Selected reaction monitoring transition parameters (e.g., collision energy, precursor and product ions) in MS/MS were optimized to achieve the best selectivity and sensitivity for a wide range of GC amenable pesticides. A short (20 m) microbore (0...
March 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28345701/the-effect-of-natural-iron-oxide-and-oxalic-acid-on-the-photocatalytic-degradation-of-isoproturon-a-kinetics-and-analytical-study
#7
H Boucheloukh, W Remache, F Parrino, T Sehili, H Mechakra
The photocatalytic degradation of isoproturon, a persistent toxic herbicide, was investigated in the presence of natural iron oxide and oxalic acid and under UV irradiation. The influence of the relevant parameters such as the pH and the iron oxide and oxalic acid concentrations has been studied. The presence of natural iron oxide and oxalic acid in the system effectively allow the degradation of isoproturon, whereas the presence of t-butyl alcohol adversely affects the phototransformation of the target pollutant, thus indicating that an OH radical initiated the degradation mechanism...
March 27, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28345638/lectin-like-oxidized-low-density-lipoprotein-receptor-1-facilitates-metastasis-of-gastric-cancer-through-driving-epithelial-mesenchymal-transition-and-pi3k-akt-gsk3%C3%AE-activation
#8
Can Li, Jie Zhang, Hao Wu, Lili Li, Caiting Yang, Shushu Song, Peike Peng, Miaomiao Shao, Mingming Zhang, Junjie Zhao, Ran Zhao, Weicheng Wu, Yuanyuan Ruan, Lan Wang, Jianxin Gu
Lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is a pattern recognition receptor that plays a critical role in vascular diseases and host immune response. Recently, our research discovered that LOX-1 could facilitate the uptake of dying cells and cross-presentation of cellular antigen via binding with heat shock proteins, which have a close relationship with gastric neoplasia. Therefore, we speculated that LOX-1 may serve as an oncogene in gastric cancer (GC) development and progression. In this study, through immunohistochemistry staining assay and cancer-related databases, we found that LOX-1 expression was up-regulated in GC tissues and correlated with a poor prognosis in GC patients...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345447/urea-enhances-cell-lysis-of-schizosaccharomyces-pombe-ura4-mutants
#9
Kohei Nishino, Misaki Kushima, Tomohiro Kaino, Yasuhiro Matsuo, Makoto Kawamukai
Cell lysis is induced in Schizosaccharomyces pombe ∆ura4 cells grown in YPD medium, which contains yeast extract, polypeptone, and glucose. To identify the medium components that induce cell lysis, we first tested various kinds of yeast extracts from different suppliers. Cell lysis of ∆ura4 cells on YE medium was observed when yeast extracts from OXOID, BD, Oriental, and Difco were used, but not when using yeast extract from Kyokuto. To determine which compounds induced cell lysis, we subjected yeast extract and polypeptone to GC-MS analysis...
March 27, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28345380/comparative-study-of-ultraviolet-laser-based-time-resolved-photoacoustic-fingerprint-spectra-and-thermal-decomposition-mechanisms-of-energetic-1-2-3-1h-triazole-derivatives-under-controlled-pyrolysis
#10
Konda Srinivasa Rao, Anil Kumar Chaudhary
We report the comparative study of photoacoustic (PA) fingerprint spectra, thermal decomposition, and stability mechanism of some phenyl and bis series energetic compounds named 1-(2-methoxy,-3,5-dinitrophenyl)-1H-1,2,3-triazole ( S5), 1-(3-methoxy, 2, 6 dinitrophenyl) 1H-1, 2, 3 triazole ( S10), 1-(4-nitrophenyl)-1H-1,2,3-triazole ( S8), and 2,6-bis ((4-(nitromethyl)-1H-1,2,3-triazol-1-yl)methyl) pyridine ( S9). Fourth harmonic wavelength, i.e., 266 nm of pulse duration 7 ns and 10 Hz repetition rate obtained from Q-switched Nd: YAG laser, was used to record the thermal PA spectra of these compounds under controlled pyrolysis condition in the range of 30-350 ℃...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28344519/assessment-of-repli-g-multiple-displacement-whole-genome-amplification-wga-techniques-for-metagenomic-applications
#11
Sofia Ahsanuddin, Ebrahim Afshinnekoo, Jorge Gandara, Mustafa Hakyemezoğlu, Daniela Bezdan, Samuel Minot, Nick Greenfield, Christopher E Mason
Amplification of minute quantities of DNA is a fundamental challenge in low-biomass metagenomic and microbiome studies because of potential biases in coverage, guanine-cytosine (GC) content, and altered species abundances. Whole genome amplification (WGA), although widely used, is notorious for introducing artifact sequences, either by amplifying laboratory contaminants or by nonrandom amplification of a sample's DNA. In this study, we investigate the effect of REPLI-g multiple displacement amplification (MDA; Qiagen, Valencia, CA, USA) on sequencing data quality and species abundance detection in 8 paired metagenomic samples and 1 titrated, mixed control sample...
March 21, 2017: Journal of Biomolecular Techniques: JBT
https://www.readbyqxmd.com/read/28344493/volatile-constituents-and-biological-activities-of-the-leaf-and-root-of-echinacea-species-from-south-africa
#12
M Nyalambisa, I A Oyemitan, R Matewu, O O Oyedeji, O S Oluwafemi, S P Songca, B N Nkeh-Chungag, A O Oyedeji
Echinacea is used ethnomedicinally for the treatment of various diseases such as cough, respiratory infections, and bronchitis among other uses in Eastern Cape region of South Africa. This study evaluated the volatile components of the essential oil of the plant, its toxicity, anti-inflammatory and analgesic activities in rodents. Dried leaf and root of the plant were separately processed by hydrodistillation for 4 h and their essential oils (EOs) were collected. Extracted oils were subjected to GC/GC-MS analysis...
March 2017: Saudi Pharmaceutical Journal: SPJ: the Official Publication of the Saudi Pharmaceutical Society
https://www.readbyqxmd.com/read/28344090/isolation-characterization-and-bioactivities-of-the-polysaccharides-from-dicliptera-chinensis-l-juss
#13
Yourui Xu, Ya Gao, Mingli Zhong, Jun Li, Houkang Cao, Simao Huang, Riming Wei, Kefeng Zhang
The polysaccharides of Dicliptera chinensis(L.) Juss. (DCP-1 and DCP-2) were extracted and isolated using the methods of water extract-ethanol precipitate and sephadex column chromatography and characterized by gel permeation chromatography (GPC), fourier transform infrared spectrometry (FT-IR) and gas chromatography (GC), respectively. The antioxidant activity of DCPs was evaluated by scavenging activity of DPPH, hydroxyl, superoxide anion and ABTS radical. Moreover, the anti-aging activity of DCP-2 was investigated using an aging model-induced by D-galactose (D-gal) in mice...
March 23, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28344076/inhibition-of-human-cyp3a4-and-cyp3a5-enzymes-by-gomisin-c-and-gomisin-g-two-lignan-analogs-derived-from-schisandra-chinensis
#14
Jin Zhao, Tao Sun, Yun-Feng Cao, Zhong-Ze Fang, Hong-Zhi Sun, Zhi-Tu Zhu, Kun Yang, Yong-Zhe Liu, Frank J Gonzalez, Jing-Jing Wu, Jun Yin
Gomisin C (GC) and gomisin G (GG) are two lignan analogs isolated from the Traditional Chinese Medicine Schisandra chinensis which possesses multiple pharmacological activities. However, the potential herb-drug interactions (HDI) between these lignans and other drugs through inhibiting human cytochrome P450 3A4 (CYP3A4) and CYP3A5 remains unclear. In the present study, the inhibitory action of GC and GG on CYP3A4 and CYP3A5 were investigated. The results demonstrated that both GC and GG strongly inhibited CYP3A-mediated midazolam 1'-hydroxylation, nifedipine oxidation and testosterone 6β-hydroxylation...
March 23, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28343946/double-stranded-rna-induces-cathelicidin-expression-in-the-intestinal-epithelial-cells-through-phosphatidylinositol-3-kinase-protein-kinase-c%C3%AE-sp1-pathway-and-ameliorates-shigellosis-in-mice
#15
Atri Ta, Bhupesh Kumar Thakur, Pujarini Dutta, Ritam Sinha, Hemanta Koley, Santasabuj Das
Cathelicidin antimicrobial peptide is a key component of the host innate immune system. It is constitutively expressed by the intestinal epithelial cells, but induced at further higher levels by different host-derived and microbial stimuli, including the ligands for Toll-like receptors (TLRs). While the underlying mechanisms of cathelicidin expression remain incompletely understood, altered expression may be associated with gastro-intestinal infections and inflammatory diseases. We demonstrate here that viral double-stranded RNA and its synthetic analog poly(I:C) are potent and tissue-specific inducers of cathelicidin mRNA and protein expression in the mouse as well as human intestinal epithelial cells...
March 24, 2017: Cellular Signalling
https://www.readbyqxmd.com/read/28343686/analysis-of-essential-oils-and-fragrances-with-a-new-generation-of-highly-inert-gas-chromatographic-columns-coated-with-ionic-liquids
#16
Cecilia Cagliero, Carlo Bicchi, Chiara Cordero, Erica Liberto, Patrizia Rubiolo, Barbara Sgorbini
In the fields of essential oils and fragrances, samples often consist of mixtures of compounds with similar structural and physical characteristics (e.g. mono- and sesquiterpenoids), whose correct identification closely depends on the synergic combination of chromatographic and mass spectral data. This sample complexity means that new GC stationary phases with different selectivities are continually being investigated. Ionic liquids (ILs) are of great interest as GC stationary phases in this field because of their selectivity (significantly different than that of currently phases) and their high temperature stability...
March 18, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28343387/hydroxyl-and-methoxyl-derivatives-of-benzylglucosinolate-in-lepidium-densiflorum-with-hydrolysis-to-isothiocyanates-and-non-isothiocyanate-products-substitution-governs-product-type-and-mass-spectral-fragmentation
#17
Eleonora Pagnotta, Niels Agerbirk, Carl Erik Olsen, Luisa Ugolini, Susanna Cinti, Luca Lazzeri
A system of benzylic glucosinolates was found and characterized in common pepperweed, Lepidium densiflorum Schrad. The major glucosinolate was the novel 4-hydroxy-3,5-dimethoxybenzylglucosinolate (3,5-dimethoxysinalbin), present at high levels in seeds, leaves and roots. Medium level glucosinolates were 3,4-dimethoxybenzylglucosinolate and 3,4,5-trimethoxybenzylglucosinolate. Minor glucosinolates included benzylglucosinolate, 3-hydroxy and 3-methoxybenzylglucosinolate, 4-hydroxybenzylglucosinolate (sinalbin), the novel 4-hydroxy-3-methoxybenzylglucosinolate (3-methoxysinalbin) and indole-type glucosinolates...
March 25, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28343386/characterization-of-the-potent-odorants-contributing-to-the-characteristic-aroma-of-matcha-by-gas-chromatography-olfactometry-techniques
#18
Ryoko Baba, Yohei Amano, Yoshiyuki Wada, Kenji Kumazawa
The odorants contributing to the characteristic aroma of Matcha were investigated by analysis of the headspace samples and the volatile fractions prepared by a combination of solvent extraction and the SAFE techniques using three Matcha powders of different grades (high, medium, and low). Gas chromatography-olfactometry of the headspace samples (GCO-H) and the aroma extract dilution analysis (AEDA) applied to the volatile fractions revealed 16 (FD factor ≥1) and 39 (FD factor ≥4(3)) odor-active peaks, respectively...
March 25, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28343375/foxo1-suppression-is-a-determinant-of-acquired-lapatinib-resistance-in-her2-positive-gastric-cancer-cells-through-met-upregulation
#19
Jinju Park, Yiseul Choi, Young San Ko, Younghoon Kim, Jung-Soo Pyo, Bo Gun Jang, Min A Kim, Jae-Seon Lee, Mee Soo Chang, Jong-Wan Park, Byung Lan Lee
Purpose: Lapatinib is a candidate drug for treatment of trastuzumab-resistant, HER2-positive gastric cancer (GC). Unfortunately, lapatinib resistance renders this drug ineffective. The present study investigated the implication of forkhead box protein O1 (FOXO1) signaling in the acquired lapatinib resistance in HER2-positive GC cells. Materials and Methods: Lapatinib-resistant GC cell lines (SNU-216 LR2-8) were generated in vitro by chronic exposure of lapatinib-sensitive, HER2-positive SNU-216 cells to lapatinib...
March 24, 2017: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/28343228/focal-brain-injury-associated-with-a-model-of-severe-hypoxic-ischemic-encephalopathy-in-nonhuman-primates
#20
Ryan M McAdams, Ronald J McPherson, Raj P Kapur, Sandra E Juul
Worldwide, hypoxic-ischemic encephalopathy (HIE) is a major cause of neonatal mortality and morbidity. To better understand the mechanisms contributing to brain injury and improve outcomes in neonates with HIE, better preclinical animal models that mimic the clinical situation following birth asphyxia in term newborns are needed. In an effort to achieve this goal, we modified our nonhuman primate model of HIE induced by in utero umbilical cord occlusion (UCO) to include postnatal hypoxic episodes, in order to simulate apneic events in human neonates with HIE...
March 25, 2017: Developmental Neuroscience
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