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Propionate

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https://www.readbyqxmd.com/read/28333168/metallic-reductant-free-synthesis-of-%C3%AE-substituted-propionic-acid-derivatives-through-hydrocarboxylation-of-alkenes-with-a-formate-salt
#1
Jun Takaya, Ko Miyama, Chuan Zhu, Nobuharu Iwasawa
A PGeP-pincer palladium-catalyzed hydrocarboxylation of styrenes to obtain pharmaceutically important α-arylpropionic acid derivatives was achieved using a formate salt as both a reductant and a CO2 source. The reaction was also applicable to vinylsulfone and acrylates. Isotope labeling experiments demonstrated that a CO2-recycling mechanism is operative through generation and reaction of a benzylpalladium complex as a carbon nucleophile. This protocol has realized a mild and atom economical CO2-fixation reaction without the necessity of using strong metallic reductants...
March 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28333132/enzyme-iia-ntr-regulates-salmonella-invasion-via-1-2-propanediol-and-propionate-catabolism
#2
Woongjae Yoo, Dajeong Kim, Hyunjin Yoon, Sangryeol Ryu
Many Proteobacteria possess a nitrogen-metabolic phosphotransferase system (PTS(Ntr)) consisting of EI(Ntr), NPr, and EIIA(Ntr) (encoded by ptsP, ptsO, and ptsN, respectively). The PTS(Ntr) plays diverse regulatory roles, but the substrate phosphorylated by EIIA(Ntr) and its primary functions have not yet been identified. To comprehensively understand the roles of PTS(Ntr) in Salmonella Typhimurium, we compared the whole transcriptomes of wild-type and a ΔptsN mutant. Genome-wide RNA sequencing revealed that 3...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332665/theoretical-insights-into-the-sites-and-mechanisms-for-base-catalyzed-esterification-and-aldol-condensation-reactions-over-cu
#3
Matthew Neurock, Zhiyuan Tao, Ashwin Chemburkar, David D Hibbitts, Enrique Iglesia
Condensation and esterification are important catalytic routes in the conversion of polyols and oxygenates derived from biomass to fuels and chemical intermediates. Previous experimental studies show that alkanal, alkanol and hydrogen mixtures equilibrate over Cu/SiO2 and form surface alkoxides and alkanals that subsequently promote condensation and esterification reactions. First-principle density functional theory (DFT) calculations were carried out herein to elucidate the elementary paths and the corresponding energetics for the interconversion of propanal + H2 to propanol and the subsequent C-C and C-O bond formation paths involved in aldol condensation and esterification of these mixtures over model Cu surfaces...
March 23, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28331124/evaluation-of-adsorption-characteristics-of-a-fibrous-adsorbent-containing-zwitter-ionic-functional-group-targeting-organic-acids
#4
Akira Nakazawa, Ning Tang, Yoshinori Inoue, Waka Kamichatani, Toshifumi Katoh, Mitsuru Saito, Kenji Obara, Akira Toriba, Kazuichi Hayakawa
Diallylamine-maleic acid copolymer (DAM)-nonwoven fabric (DAM-f), a fibrous adsorbent, contains DAM with zwitter-ionic functional groups and forms a hydration layer on the surface. The aim of this report was to evaluate the adsorption selectivity of DAM-f to semi-volatile organic acid (C1-C5). In the aqueous phase, formic acid dissolved in the hydration layer bound to the imino group of DAM-f due to anion exchange interaction. In the gas phase, the adsorption amounts of organic acids increased with the exposure time...
2017: Journal of UOEH
https://www.readbyqxmd.com/read/28326936/a-role-for-the-locus-coeruleus-in-the-analgesic-efficacy-of-n-acetylaspartylglutamate-peptidase-gcpii-inhibitors-zj43-and-2-pmpa
#5
Takahiro Nonaka, Toshihiko Yamada, Tatsuhiro Ishimura, Daiying Zuo, John R Moffett, Joseph H Neale, Tatsuo Yamamoto
N-acetylaspartylglutamate (NAAG) is the third most prevalent and widely distributed neurotransmitter in the mammalian nervous system. NAAG activates a group II metabotropic glutamate receptor (mGluR3) and is inactivated by an extracellular enzyme, glutamate carboxypeptidase II (GCPII) in vivo. Inhibitors of this enzyme are analgesic in animal models of inflammatory, neuropathic and bone cancer pain. NAAG and GCPII are present in the locus coeruleus, a center for the descending noradrenergic inhibitory pain system...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28326448/anaerobic-metabolism-in-t4-acanthamoeba-genotype
#6
Daniella de Sousa Mendes Moreira Alves, Luciano Moreira Alves, Tatiane Luiza da Costa, Ana Maria de Castro, Marina Clare Vinaud
Members of the genus Acanthamoeba are of the most common protozoa that has been isolated from a variety of environment and affect immunocompromised individuals, causing granulomatous amoebic encephalitis and skin lesions. Acanthamoeba, in immunocompetent patients, may cause a keratitis related to corneal microtrauma. These free-living amoebas easily adapt to the host environment and wield metabolic pathways such as the energetic and respiratory ones in order to maintain viability for long periods. The energetic metabolism of cysts and trophozoites remains mostly unknown...
March 22, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28326319/inhibitory-activities-of-stauntonia-hexaphylla-leaf-constituents-on-rat-lens-aldose-reductase-and-formation-of-advanced-glycation-end-products-and-antioxidant
#7
Seung Hwan Hwang, Shin Hwa Kwon, Set Byeol Kim, Soon Sung Lim
Stauntonia hexaphylla (Thunb.) Decne. (Lardizabalaceae) leaves (SHL) have been used traditionally as analgesics, sedatives, diuretics, and so on, in China. To date, no data have been reported on the inhibitory effect of SHL and its constituents on rat lens aldose reductase (RLAR) and advanced glycation end products (AGEs). Therefore, the inhibitory effect of compounds isolated from SHL extract on RLAR and AGEs was investigated to evaluate potential treatments of diabetic complications. The ethyl acetate (EtOAC) fraction of SHL extract showed strong inhibitory activity on RLAR and AGEs; therefore, EtOAc fraction (3...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28323024/ppar%C3%AE-activation-by-mhy908-attenuates-age-related-renal-inflammation-through-modulation-of-the-ros-akt-foxo1-pathway
#8
Ye Ra Kim, Eun Kyeong Lee, Dae Hyun Kim, Kyung Mok Kim, Bonggi Lee, Hye Jin An, June Whoun Park, Kyoung Mi Moon, Min Hi Park, Ki Wung Chung, Ji Young Park, Seong Jin Kim, Hwi Young Yun, Sujin Son, Pusoon Chun, Hyung Ryong Moon, Hae Young Chung
2-[4-(5-Chlorobenzothiazothiazol-2-yl)phenoxy]-2-methyl-propionic acid (MHY908) has been shown to prevent insulin resistance-induced hyperinsulinemia in aged rats. However, the mechanism underlying MHY908-mediated amelioration of renal inflammation with insulin resistance during aging remains unknown. This study investigated the effects of MHY908 on age-related changes in the IRS/Akt/forkhead box (FoxO) 1 signaling pathway in the kidneys of aged rats and HEK293T cells. Experiments were performed in young, old, and MHY908-fed old rats (1mg or 3mg/kg/day MHY908 for 4 weeks)...
March 18, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28322790/short-chain-fatty-acids-gpr41-and-gpr43-ligands-inhibit-tnf-%C3%AE-induced-mcp-1-expression-by-modulating-p38-and-jnk-signaling-pathways-in-human-renal-cortical-epithelial-cells
#9
Mamiko Kobayashi, Daisuke Mikami, Hideki Kimura, Kazuko Kamiyama, Yukie Morikawa, Seiji Yokoi, Kenji Kasuno, Naoki Takahashi, Takanobu Taniguchi, Masayuki Iwano
Short-chain fatty acids (SCFAs), such as acetate, propionate, and butyrate, are produced predominantly by gut microbiota fermentation of dietary fiber. SCFAs are newly identified as endogenous ligands of two orphan G protein-coupled receptors, GPR41 and GPR43, which have the potential to modulate inflammation. Therefore, GPR41 and GPR43 may mediate the link between the gut microbiome status and various disease conditions including renal inflammation. This study aimed at investigating whether SCFAs activate GPR41 and GPR43, and thereby exert anti-inflammatory effects in human renal cortical epithelial cells (HRCEs) as a main component of kidney tissue...
March 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28322599/dissolvit-an-in-vitro-method-for-simulating-the-dissolution-and-absorption-of-inhaled-dry-powder-drugs-in-the-lungs
#10
Per Gerde, Maria Malmlöf, Lina Havsborn, Carl-Olof Sjöberg, Pär Ewing, Stefan Eirefelt, Katarina Ekelund
The main purpose of this work was to develop an in vitro method for simulating the dissolution and absorption of inhaled dry powder drugs that also mimics systemic pharmacokinetic data. A second purpose was to evaluate this method. DissolvIt(®) was developed as a simulation of the air-blood barrier of the upper airways, constituting: "airborne" particles deposited on a glass cover slip, a mucus simulant, a polycarbonate (basal) membrane, and a pumped albumin buffer simulating the pulmonary blood flow. The PreciseInhale(®) exposure system was used to aerosolize and deposit test formulations onto cover slips...
February 2017: Assay and Drug Development Technologies
https://www.readbyqxmd.com/read/28322439/modeling-multidimensional-and-multispecies-biofilms-in-porous-media
#11
Youneng Tang, Haihu Liu
Modeling multidimensional and multispecies biofilm in porous media at the pore scale is challenging due to the need to simultaneously track the microbial community in the biofilms and the interfaces between the biofilms and the fluid. Therefore, researchers usually assume that the model has only one dimension in space or has only one microbial species. This work uses bioremediation of U(VI)-contaminated groundwater as the context to develop a two-dimensional and multispecies biofilm model. The model simulates the transverse mixing zone in which U(VI) is mixed with propionate, a nutrient externally supplied to stimulate the growth of microorganisms...
March 21, 2017: Biotechnology and Bioengineering
https://www.readbyqxmd.com/read/28321784/co-fermentation-of-cheese-whey-and-crude-glycerol-in-egsb-reactor-as-a-strategy-to-enhance-continuous-hydrogen-and-propionic-acid-production
#12
Helberth Júnnior Santos Lopes, Lucas Rodrigues Ramos, Edson Luiz Silva
This study evaluated the production of hydrogen and propionic acid in an expanded granular sludge bed (EGSB) reactor by co-fermentation of cheese whey (CW) and crude glycerol (CG). The reactor was operated at hydraulic retention time (HRT) of 8 h by changing the CW/CG ratio from 5:1 to 5:2, 5:3, 5:4, and 5:5. At the ratio of 5:5, HRT was reduced from 8 to 0.5 h. The maximum hydrogen yield of 0.120 mmol H2 g COD(-1) was observed at the CW/CG ratio of 5:1. Increasing the CG concentration repressed hydrogen production in favor of propionic acid, with a maximum yield of 6...
March 20, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28321368/plant-growth-promoting-endophytic-bacteria-versus-pathogenic-infections-an-example-of-bacillus-amyloliquefaciens-rwl-1-and-fusarium-oxysporum-f-sp-lycopersici-in-tomato
#13
Raheem Shahzad, Abdul Latif Khan, Saqib Bilal, Sajjad Asaf, In-Jung Lee
Fungal pathogenic attacks are one of the major threats to the growth and productivity of crop plants. Currently, instead of synthetic fungicides, the use of plant growth-promoting bacterial endophytes has been considered intriguingly eco-friendly in nature. Here, we aimed to investigate the in vitro and in vivo antagonistic approach by using seed-borne endophytic Bacillus amyloliquefaciens RWL-1 against pathogenic Fusarium oxysporum f. sp. lycopersici. The results revealed significant suppression of pathogenic fungal growth by Bacillus amyloliquefaciens in vitro...
2017: PeerJ
https://www.readbyqxmd.com/read/28320620/effect-of-fe-0-addition-on-volatile-fatty-acids-evolution-on-anaerobic-digestion-at-high-organic-loading-rates
#14
Xin Kong, Shuyao Yu, Shuang Xu, Wen Fang, Jianguo Liu, Huan Li
Excessive acidification frequently occurs in the anaerobic digestion of the organic fraction of municipal solid waste (OFMSW) at high organic loading rates (OLR), due to the accumulation of non-acetic volatile fatty acids (VFA). In this study, the performance of Fe(0) in enhancing various VFA production and metabolism was investigated. The butyric acid concentration in a high OLR reactor with Fe(0) addition decreased from 7200 to 0mg/L after a short lag phase, and the total VFA (TVFA) concentration also decreased substantially...
March 17, 2017: Waste Management
https://www.readbyqxmd.com/read/28319781/systematic-study-of-imidazoles-inhibiting-ido1-via-the-integration-of-molecular-mechanics-and-quantum-mechanics-calculations
#15
Yi Zou, Fang Wang, Yan Wang, Wenjie Guo, Yihua Zhang, Qiang Xu, Yisheng Lai
Indoleamine 2,3-dioxygenase 1 (IDO1) is regarded as an attractive target for cancer immunotherapy. To rationalize the detailed interactions between IDO1 and its inhibitors at the atomic level, an integrated computational approach by combining molecular mechanics and quantum mechanics methods was employed in this report. Specifically, the binding modes of 20 inhibitors was initially investigated using the induced fit docking (IFD) protocol, which outperformed other two docking protocols in terms of correctly predicting ligand conformations...
March 14, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28319778/polyhydroxyalkanoates-pha-production-from-synthetic-waste-using-pseudomonas-pseudoflava-pha-synthase-enzyme-activity-analysis-from-p-pseudoflava-and-p-palleronii
#16
M Venkateswar Reddy, Yasuteru Mawatari, Rui Onodera, Yuki Nakamura, Yuka Yajima, Young-Cheol Chang
Synthetic wastewater (SW) at various carbon concentrations (5-60g/l) were evaluated for polyhydroxyalkanoates (PHA) production using the bacteria Pseudomonas pseudoflava. Bacteria showed highest PHA production with 20g/l (57±5%), and highest carbon removal at 5g/l (74±6%) concentrations respectively. Structure, molecular weight, and thermal properties of the produced PHA were evaluated using various analytical techniques. Bacteria produced homo-polymer [poly-3-hydroxybutyrate (P3HB)] when only acetate was used as carbon source; and it produced co-polymer [poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) P(3HB-co-3HV)] by addition of co-substrate propionate...
March 4, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28317156/synthesis-and-anticonvulsant-properties-of-new-3-3-diphenyl-2-5-dioxo-pyrrolidin-1-yl-acetamides-and-3-3-diphenyl-propionamides
#17
Jolanta Obniska, Anna Rapacz, Sabina Rybka, Małgorzata Góra, Paweł Żmudzki, Krzysztof Kamiński
The focused library of new amides derived from 3,3-diphenyl-2,5-dioxo-pyrrolidin-1-yl-acetic acid (2a-t) and 3,3-diphenyl-propionic acid (3a-t) as potential anticonvulsant agents was synthesized. The final products were obtained in the amidation reaction of the given carboxylic acid (2, 3) with appropriate secondary amines in the presence of carbonyldiimidazole (CDI) as a coupling reagent. The initial anticonvulsant screening was performed in mice intraperitoneally (i.p.) using the "classical" maximal electroshock (MES) and subcutaneous pentylenetetrazole (scPTZ) seizure models, whereas the acute neurological toxicity was determined applying the rotarod test...
March 20, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28314523/detection-of-anabolic-and-androgenic-steroids-and-or-their-esters-in-horse-hair-using-ultra-high-performance-liquid-chromatography-high-resolution-mass-spectrometry
#18
Karen Y Kwok, Timmy L S Choi, Wai Him Kwok, Jenny K Y Wong, Terence S M Wan
Anabolic and androgenic steroids (AASs) are a class of prohibited substances banned in horseracing at all times. The common approach for controlling the misuse of AASs in equine sports is by detecting the presence of AASs and/or their metabolites in urine and blood samples using gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS). This approach, however, often falls short as the duration of effect for many AASs are longer than their detection time in both urine and blood...
March 6, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28306342/nmr-based-plasma-metabolomic-discrimination-for-male-fertility-assessment-of-rats-treated-with-eurycoma-longifolia-extracts
#19
Forough Ebrahimi, Baharudin Ibrahim, Chin-Hoe Teh, Vikneswaran Murugaiyah, Kit-Lam Chan
Male infertility is one of the leading causes of infertility which affects many couples worldwide. Semen analysis is a routine examination of male fertility status which is usually performed on semen samples obtained through masturbation that may be inconvenient to patients. Eurycoma longifolia (Tongkat Ali, TA), native to Malaysia, has been traditionally used as a remedy to boost male fertility. In our recent studies in rats, upon the administration of high-quassinoid content extracts of TA including TA water (TAW), quassinoid-rich TA (TAQR) extracts, and a low-quassinoid content extract including quassinoid-poor TA (TAQP) extract, sperm count (SC) increased in TAW- and TAQR-treated rats when compared to the TAQP-treated and control groups...
March 17, 2017: Systems Biology in Reproductive Medicine
https://www.readbyqxmd.com/read/28304288/changes-in-synaptic-plasticity-and-glutamate-receptors-in-type-2-diabetic-kk-ay-mice
#20
Huajing Yin, Weiping Wang, Wenwen Yu, Jiang Li, Nan Feng, Ling Wang, Xiaoliang Wang
In the present study, the progressive alteration of cognition and the mechanisms of reduction in long-term potentiation (LTP) in spontaneous obese KK-Ay type 2 diabetic mice were investigated. In the study, 3-, 5-, and 7-month-old KK-Ay mice were used. The results indicated that KK-Ay mice showed cognitive deficits in the Morris water maze test beginning at the age of 3 months. LTP was significantly impaired in KK-Ay mice during whole study period (3 to 7 months). The above deficits were reversible at an early stage (3 to 5 months old) by diet intervention...
March 18, 2017: Journal of Alzheimer's Disease: JAD
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