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IR acid

Michelle C Neary, Patrick J Quinlivan, Gerard Parkin
Zerovalent nickel compounds which feature 1,2-bis(diphenylphosphino)benzene (dppbz) were obtained via the reactivity of dppbz towards Ni(PMe3)4, which affords sequentially (dppbz)Ni(PMe3)2 and Ni(dppbz)2. Furthermore, the carbonyl derivatives (dppbz)Ni(PMe3)(CO) and (dppbz)Ni(CO)2 may be obtained via the reaction of CO with (dppbz)Ni(PMe3)2. Other methods for the synthesis of these carbonyl compounds include (i) the formation of (dppbz)Ni(CO)2 by the reaction of Ni(PPh3)2(CO)2 with dppbz and (ii) the formation of (dppbz)Ni(PMe3)(CO) by the reaction of (dppbz)Ni(CO)2 with PMe3...
December 15, 2017: Inorganic Chemistry
Rafig Gurbanov, Nihal Simsek Ozek, Sinem Tunçer, Feride Severcan, Ayse Gul Gozen
In this study, the molecular profile changes leading to the adaptation of bacteria to survive and grow at inhibitory silver concentration were explored. The profile obtained through infrared (IR)-based measurements indicated extensive changes in all biomolecular components, which were supported by chemometric techniques. The changes in biomolecular profile were prominent including nucleic acids. The changes in nucleic acid region (1350-950 cm-1 ) were encountered as a clue for conformational change in DNA. Further analysis of DNA by IR spectroscopy revealed changes in the backbone and sugar conformations...
December 15, 2017: Journal of Biophotonics
Ryutaro Kuraji, Miyako Fujita, Hiroshi Ito, Shuichi Hashimoto, Yukihiro Numabe
Recent studies have shown that periodontitis accelerates the progression of obesity-associated metabolic diseases. Thus, we examined the influence of periodontitis on serum biochemical parameters of metabolic disease in a diet-induced obesity (DIO) rat. First, we established the DIO model using ten male rats fed with either basal diet (lean group) or high-fat diet (DIO group) for 12 weeks. Second, to examine the interaction between periodontitis and obesity, we divided 24 DIO rats into the following four groups...
December 14, 2017: Odontology
Xichuan Zhai, Caiping Zhu, Yun Li, Yang Zhang, Zhen Duan, Xingbin Yang
In this work, based on response surface methodology (RSM), an optimized method of extracting water-soluble polysaccharide from pomegranate peel (PPP) with pectinase was proposed. Additionally, the chemical composition and the antioxidant activities of the extracted PPP were studied. The effects of three factors of enzymolysis time, ratio of liquid to solid and dosage of enzyme on the PPP yield were investigated. The experimental results showed that the optimal conditions were as following: enzymolysis time 19...
December 11, 2017: International Journal of Biological Macromolecules
Mohsen Mazidi, Arrigo F Cicero, Andre Pascal Kengne, Maciej Banach
There is limited evidence on the association between plasma trans-fatty acids (TFAs) and cardiometabolic risk factors. Therefore, we examined the association between plasma TFA concentrations and glucose homeostasis and cardiovascular (CV) risk factors in adult Americans from the 1999 to 2000 National Health and Nutrition Examination Survey participants. Derivatized TFAs were separated by capillary gas chromatography. Of the 1678 participants, 46.5% were men. The mean age was 50.5 years overall, with no significant difference between men and women ( P = ...
January 1, 2017: Angiology
Jie Liu, Chuang-Jun Li, Yi-Qian Du, Li Li, Hua Sun, Nai-Hong Chen, Dong-Ming Zhang
In view of the significant neuroprotective effect of Clausena lansium, we continued to separate the n-butanol and the water extracts from the stems of C. lansium in order to find the leading compounds with significant activity. Two new phenolic glycosides, Clausenolside A-B (1-2), one new pair of phenolic enantiomers (3a, 3b), and two new monoterpenoids, clausenapene A-B (4-5), together with twelve known analogues (6-17) were isolated from the stems of C. lansium. Compounds 1-17 were obtained from C. lansium for the first time...
December 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Enikő Rab, Dimitrios Kekos, Vassilios Roussis, Efstathia Ioannou
Four new (1-4) and six previously reported (5-10) α-pyrone polyketides, along with benzoic acid, hydrocinnamic acid, and (E)-cinnamic acid, were isolated from the organic extract resulting from the cultivation of the algicolous strain Streptomyces ambofaciens BI0048, which in turn was isolated from the inner tissues of the red alga Laurencia glandulifera. The structure elucidation of the isolated natural products was based on extensive analysis of their spectroscopic data (NMR, MS, UV, IR). Compounds 1-10 were evaluated for their antibacterial and cytotoxic activities against two multidrug-resistant strains of Staphylococcus aureus and one strain of Escherichia coli, as well as two human cancer cell lines...
December 14, 2017: Marine Drugs
Xiaohui Xu, Xiaoqiang Li, Gangyi Yang, Ling Li, Wenjing Hu, Lili Zhang, Hua Liu, Hongting Zheng, Minghong Tan, Danping Zhu
Our objective is to determine circulating Bone morphogenetic protein-9(BMP-9) levels in subjects with Metabolic Syndrome (MetS) and examine the relationship between BMP-9 and conventional markers for MetS and insulin resistance (IR). A total of 362 newly diagnosed patients with MetS along with healthy controls were recruited for this cross-sectional study. Circulating BMP-9 levels were measured by ELISA. Circulating BMP-9 levels were significantly lower in MetS patients compared to those of the healthy controls...
December 13, 2017: Scientific Reports
Mohamed Raâfet Ben Khedher, Houda Bouhajja, Samia Haj Ahmed, Mohamed Abid, Kamel Jamoussi, Mohamed Hammami
BACKGROUND: Vasculogenic erectile dysfunction (VED) is considered as a common complication among people with type 2 diabetes (T2D). We tested whether changes in fatty acid (FAs) classes measured in erythrocytes are associated with increased risk of diabetic VED along with related risk factors. METHODS: We assessed erythrocyte FAs composition, lipid peroxidation parameters and inflammatory cytokines among 72 T2D men with VED, 78 T2D men without VED and 88 healthy volunteers with similar age...
December 12, 2017: Lipids in Health and Disease
Y N Paudel, M R Ali, S Bawa, S Shah, M Adil, A Siddiqui, A S Basheer, M Q Hassan, M Sharma
4-Methyl-2-[(2-methylbenzyl) amino]-1,3-thiazole-5-carboxylic acid (bioactive compound (BAC)), a novel thiazole derivative, is a xanthine oxidase inhibitor and free radical scavenging agent. Effects of BAC on hyperglycemia, insulin sensitivity, oxidative stress, and inflammatory mediators were evaluated in streptozotocin (STZ)-induced neonatal models of non-insulin-dependent diabetes mellitus (NIDDM) rats where NIDDM was induced in neonatal pups with single intraperitoneal injection of STZ (100 mg/kg). The effect of BAC (10 and 20 mg/kg, p...
January 1, 2017: Human & Experimental Toxicology
Ji-Eun Ahn, Yan Chen, Hubert O Amrein
Behavioral studies have established that Drosophila appetitive taste responses to towards fatty acids are mediated by sweet sensing Gustatory Receptor Neurons (GRNs). Here we show that sweet GRN activation requires the function of the IonotropicReceptor genes IR25a, IR76b and IR56d. The former two IR genes are expressed in several neurons per sensilla, while IR56d expression is restricted to sweet GRNs. Importantly, loss of appetitive behavioral responses to fatty acids in IR25a and IR76b mutant flies can be completely rescued by expression of respective transgenes in sweet GRNs...
December 12, 2017: ELife
Natalia Mayordomo, Harald Foerstendorf, Johannes Lutzenkirchen, Karsten Heim, Stephan Weiss, Ursula Alonso, Tiziana Missana, Katja Schmeide, Norbert Jordan
The sorption processes of Se(IV) onto γ-Al2O3 were studied by in situ Infrared spectroscopy, batch sorption studies, zeta potential measurements and Surface Complexation Modeling (SCM) in the pH range from 5 to 10. In situ Attenuated Total Reflection Fourier-transform Infrared (ATR FT-IR) spectroscopy revealed the predominant formation of a single inner-sphere surface species at the alumina surface, supporting previously reported EXAFS results, irrespective of the presence or absence of atmospherically derived carbonate...
December 12, 2017: Environmental Science & Technology
Artur Kasprzak, Ireneusz P Grudzinski, Magdalena Bamburowicz-Klimkowska, Andrzej Parzonko, Maciej Gawlak, Magdalena Poplawska
This work presents a very new look at folate targeting and is focused on synthesizing and assessing the biological activity of folic acid-targeted drug delivery materials based on β-cyclodextrin. Both folic acid and β-cyclodextrin have been covalently conjugated to branched polyethylenimine as the polymeric vector. Host-guest inclusion of folic acid into a β-cyclodextrin cavity, demonstrated by means of the spectroscopic methods (2-D NMR, IR, UV-Vis), is found to be of crucial importance for biological activity of nanotherapeutics...
December 12, 2017: Macromolecular Bioscience
Rupa Rani, Zeba Usmani, Pratishtha Gupta, Avantika Chandra, Aakankshya Das, Vipin Kumar
The study aimed to identify an effective phosphate-solubilizing and organochlorine pesticide-tolerant bacterial strain(s). A total of 50 phosphate-solubilizing bacterial (PSB) strains were isolated from pesticide-stressed soil. Ten isolates showing higher solubilization were selected for organochlorine pesticides (endosulfan, aldrin, and lindane) tolerance. The strain IITISM08 showed the maximum potential of phosphorous solubilization in Pikovaskya agar medium (solubilization index = 3.2) and in broth medium (348 ± 2 μg mL-1) and tolerated up to 250 μg mL-1 of organochlorine pesticides...
December 11, 2017: Environmental Science and Pollution Research International
Gang Wu, Irene C M Kwan, Zhimin Yan, Yining Huang, Eric Ye
Early X-ray fiber diffraction studies have established that the spontaneous gel formation of guanosine 5'-monophosphate (5'-GMP) under slightly acidic conditions (e.g., pH 5) results from self-assembly of 5'-GMP into a helical structure in which hydrogen-bonded guanine bases form a continuous helix with 15 nucleotides per 4 turns. For more than five decades, the sense of this helix is believed to be left-handed. Using multinuclear solid-state NMR and IR spectroscopic methods, we have finally determined the long-missing structural details of this helix...
2017: Journal of Nucleic Acids
Evelyn Thais Fantozzi, Ana Cristina Breithaupt-Faloppa, Fernanda Yamamoto Ricardo-da-Silva, Sara Rodrigues-Garbin, Daniel Cancelli Romero, Adriana da Silva Rodrigues, Yanira Riffo-Vasquez, Wothan Tavares-de-Lima
BACKGROUND: Lung inflammation is one of the main consequences of intestinal ischemia reperfusion (intestinal IR) and, in severe cases, can lead to acute respiratory distress syndrome and death. We have previously demonstrated that estradiol exerts a protective effect on lung edema and cytokine release caused by intestinal IR in male rats. MATERIALS AND METHODS: We investigated the role of estradiol on the generation of interleukin (IL)-1β, IL-10, vascular endothelial growth factor (VEGF), and cytokine-induced neutrophil chemoattractant 1 (CINC-1) in a female rat model of intestinal IR...
January 2018: Journal of Surgical Research
Łukasz Wołoszyn, Maria M Ilczyszyn
Two new crystalline salts: β-alaninium trifluoromethanesulfonate (β-AlaOTf) and bis(β-alanine) trifluoromethanesulfonate (β-2AlaOTf) were obtained. The former one contains diprotonated β-alanine dimer, the latter one monoprotonated β-alanine dimer. Both compounds were studied by single crystal XRD, vibrational (IR and Raman) spectroscopy and calorimetric method. The quantum-mechanical calculations (DFT/B3LYP/6-311++G(2d,2p)) for the diprotonated dimer were carried out. The β-AlaOTf salt crystallizes in the P1¯ space group of triclinic system (Z=2), the β-2AlaOTf in the P21/m space group of monoclinic system (Z=2)...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Xiao-Jing Zhang, Xu Cheng, Zhen-Zhen Yan, Jing Fang, Xiaozhan Wang, Weijun Wang, Zhen-Yu Liu, Li-Jun Shen, Peng Zhang, Pi-Xiao Wang, Rufang Liao, Yan-Xiao Ji, Jun-Yong Wang, Song Tian, Xue-Yong Zhu, Yan Zhang, Rui-Feng Tian, Lin Wang, Xin-Liang Ma, Zan Huang, Zhi-Gang She, Hongliang Li
Hepatic ischemia-reperfusion (IR) injury is a common clinical issue lacking effective therapy and validated pharmacological targets. Here, using integrative 'omics' analysis, we identified an arachidonate 12-lipoxygenase (ALOX12)-12-hydroxyeicosatetraenoic acid (12-HETE)-G-protein-coupled receptor 31 (GPR31) signaling axis as a key determinant of the hepatic IR process. We found that ALOX12 was markedly upregulated in hepatocytes during ischemia to promote 12-HETE accumulation and that 12-HETE then directly binds to GPR31, triggering an inflammatory response that exacerbates liver damage...
December 11, 2017: Nature Medicine
Yiming Ren, Sophie A L Rousseaux
A mild and metal-free synthesis of aryl isocyanates from arylamines under an atmosphere of CO2 has been developed. The carbamic acid intermediate, derived from the arylamine starting material and CO2 in the presence of DBU, is dehydrated by activated sulfonium reagents to generate the corresponding isocyanate. The latter can be detected by in situ IR and trapped by various amines and alcohols to make unsymmetrical ureas and carbamates, respectively. Dicarbamates can also be prepared in good yields via the mild dehydration of the corresponding dicarbamic acids...
December 11, 2017: Journal of Organic Chemistry
Hanhan Luo, Xiangyu Huang, Yuhan Luo, Zhuang Li, Lan Li, Chao Gao, Jinyan Xiong, Wei Li
The acidic blue 25 (AB25) dye was efficiently adsorbed by CB [8]; the saturated adsorption capacity (qexp) reached 434.8mg/g and was far higher than those of previous reported adsorbents. The Langmuir and Freundich isotherms were used to fit the equilibrium data, and the results showed that the Freundlich isotherm seemed to agree better with the AB25 adsorption. The adsorption kinetics followed the pseudo-second-order model. Calculated thermodynamic parameters showed that the adsorption of AB25 onto CB [8] was a spontaneous and enthalpy-driven process...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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