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https://www.readbyqxmd.com/read/28526341/preparation-and-characterization-of-amidated-derivatives-of-alginic-acid
#1
Tomáš Taubner, Milan Marounek, Andriy Synytsya
Alginic acid is a suitable material for modification to prepare new derivatives because of presence of its carboxyl groups. The high content of carboxyl groups over the entire length of its chain renders it an easily modifiable material with a possibility of achieving a high degree of substitution in the prepared derivatives. The salt of alginic acid (sodium alginate) is readily commercially available and is widely used in many branches of chemistry. Alginic acid was thus selected as the substrate for amidation...
May 16, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28526264/celecoxib-aggravates-cardiac-apoptosis-in-l-name-induced-pressure-overload-model-in-rats-immunohistochemical-determination-of-cardiac-caspase-3-mcl-1-bax-and-bcl-2
#2
Sarah M Mosaad, Sawsan A Zaitone, Abdelazim Ibrahim, Amani A El-Baz, Dina M Abo-Elmatty, Yasser M Moustafa
The mechanism of celecoxib cardiovascular adverse events was earlier investigated; yet in-depth investigations are needed to assess the involvement of its pro-apoptotic effect throughout this process. An in-vivo chronic rat model of pressure overload employing Nʷ-nitro-l-arginine methyl ester (L-NAME) was tested at different time intervals to ensure the occurrence of persistent myocardial apoptosis along with pressure overload. Seven groups of male Wistar rats were assigned as (i) distilled water; (ii-iv) L-NAME (60 mg/kg) for 6, 12 or 16 weeks; (v-vii) L-NAME [16 weeks] + celecoxib (25, 50 or 100 mg/kg), from week 13 to week 16...
May 16, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28524719/polyester-based-microdisc-systems-for-sustained-release-of-neuroprotective-phosphine-borane-complexes
#3
David A Janus, Christopher J Lieven, Megan E Crowe, Leonard A Levin
Phosphine-borane complexes are recently developed redox-active drugs that are neuroprotective in models of optic nerve injury and radioprotective in endothelial cells. However, a single dose of these compounds is short-lived, necessitating development of sustained-release formulations of these novel molecules. We screened a library of biodegradable co- and non-block polyester polymer systems for release of incorporated phosphine-borane complexes to evaluate them as drug delivery systems for use in chronic disease...
May 19, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28521372/synthesis-and-characterization-of-new-azecine-derivatives-as-potential-neuroleptics
#4
Stephanie Zergiebel, Christian Fleck, Hans-Dieter Arndt, Christoph Enzensperger, Andreas Seeling
Dibenzo- and benzindolo-azecines represent a class of potential neuroleptics. To characterize the effectiveness at the dopamine and 5-HT2A-receptor representative structures were synthesized and tested by radio ligand binding studies, in vivo and in vitro studies.Neuroleptic potency and the risk of side effects of the prodrug 7-methyl-5,6,7,8,9,14-hexahydrodibenzo[d,g]azecin-3-yl isobutyrate, an ester derivative of the most promising azecine 7-methyl-5,6,7,8,9,14-hexahydrodibenzo[d,g]azecin-3-ol (LE404), was tested in vivo concerning conditioned avoidance response inhibition, locomotor activity and triggering of catalepsy vs...
May 18, 2017: Drug Research
https://www.readbyqxmd.com/read/28517940/thermal-decomposition-of-potential-ester-biofuels-part-i-methyl-acetate-and-methyl-butanoate
#5
Jessica P Porterfield, David H Bross, Branko Ruscic, James H Thorpe, Thanh Lam Nguyen, Joshua H Baraban, John F Stanton, John W Daily, G Barney Ellison
Two methyl esters have been examined as models for the pyrolysis of biofuels. Dilute samples (0.06 - 0.13%) of methyl acetate (CH3COOCH3) and methyl butanoate (CH3CH2CH2COOCH3) were entrained in (He, Ar) carrier gas and decomposed in a set of flash-pyrolysis micro-reactors. The pyrolysis products resulting from the methyl esters were detected and identified by vacuum ultraviolet photoionization mass spectrometry. Complementary product identification was provided by matrix infrared absorption spectroscopy. Pyrolysis pressures in the pulsed micro-reactor were roughly 20 Torr and residence times through the reactors were approximately 25 - 150 µs...
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28516516/towards-long-term-stable-and-efficient-large-area-organic-solar-cells
#6
Pei-Ting Tsai, Kuan-Chu Lin, Cheng-Yu Wu, Chung-Hung Liao, Man-Chun Lin, Ying Qian Wong, Hsin-Fei Meng, Chih-Yu Chang, Chien-Lung Wang, Yi-Fan Huang, Sheng-Fu Horng, Hsiao-Wen Zan, Yu-Chiang Chao
In this study, we report that long-term stable and efficient organic solar cells (OSCs) can be obtained via the following strategies: (1) combination of rapid-drying blade-coating deposition with an appropriate thermal annealing treatment to obtain an optimized morphology of the active layer; (2) insertion of interfacial layers to optimize the interfacial properties. The resulting devices based on poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)] (PBDTTT-EFT):[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) blend as the active layer exhibits a power conversion efficiency (PCE) up to 9...
May 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28515733/stable-internal-reference-genes-for-normalizing-real-time-quantitative-pcr-in-baphicacanthus-cusia-under-hormonal-stimuli-and-uv-irradiation-and-in-different-plant-organs
#7
Yuxiang Huang, Hexin Tan, Jian Yu, Yue Chen, Zhiying Guo, Guoquan Wang, Qinglei Zhang, Junfeng Chen, Lei Zhang, Yong Diao
Baphicacanthus cusia (Nees) Bremek, the plant source for many kinds of drugs in traditional Chinese medicine, is widely distributed in South China, especially in Fujian. Recent studies about B. cusia mainly focus on its chemical composition and pharmacological effects, but further analysis of the plant's gene functions and expression is required to better understand the synthesis of its effective compounds. Real-time quantitative polymerase chain reaction (RT-qPCR) is a powerful method for gene expression analysis...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28515388/nitric-oxide-is-critical-for-avoiding-hepatic-lipid-overloading-via-il6-induction-during-liver-regeneration-after-partial-hepatectomy-in-mice
#8
Yue Yu, Miho Tamai, Yoh-Ichi Tagawa
Nitric oxide (NO), generated from L-arginine by three different isoforms of nitric oxide synthase (NOS), is a pleiotropic factor to regulate physiological functions in almost every organ and tissue. Each knockout mouse of iNOS or eNOS has been used to suggest that NO has a crucial role in liver regeneration after partial hepatectomy (PH), for NO may inhibit caspase 3 activity and is required for EGFR signaling. In previous reports, defective mitochondrial β-oxidation was observed in eNOS KO mice, and hepatic steatosis was often correlated to deficient liver regeneration, so we focused on metabolic perspective and hypothesized that NO depletion in PH mice would affect hepatocytic lipolysis and impair hepatocytes proliferation...
May 18, 2017: Experimental Animals
https://www.readbyqxmd.com/read/28515023/corrigendum-chikusetsusaponin-iva-methyl-ester-induces-g1-cell-cycle-arrest-triggers-apoptosis-and-inhibits-migration-and-invasion-in-ovarian-cancer-cells-phytomedicine-2016-23-13-1555-1565
#9
Xin Chen, Qiu-Shuang Wu, Fan-Cheng Meng, Zheng-Hai Tang, Xiuping Chen, Li-Gen Lin, Ping Chen, Wen-An Qiang, Yi-Tao Wang, Qing-Wen Zhang, Jin-Jian Lu
No abstract text is available yet for this article.
June 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28512333/hybrid-organic-tandem-solar-cell-comprising-small-molecule-bottom-and-polymer-fullerene-top-subcells-fabricated-by-thin-film-transfer
#10
Yoonseok Ka, Hyejin Hwang, Changsoon Kim
Multilayer structures involving solution-deposited polymer films are difficult to fabricate, not allowing for unrestricted designs of polymer-based optoelectronic devices required for maximizing their performance. Here, we fabricate a hybrid organic tandem solar cell whose top and bottom subcells have polymer:fullerene and small molecules active layers, respectively, by a solvent-free process based on transferring the polymer:fullerene layer from an elastomeric stamp onto a vacuum-deposited bottom subcell. The interface between small-molecule and transferred polymer:fullerene layers is void-free at the nanoscale, allowing for efficient charge transport across the interface...
May 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28508135/adaptations-of-archaeal-and-bacterial-membranes-to-variations-in-temperature-ph-and-pressure
#11
REVIEW
Melvin F Siliakus, John van der Oost, Servé W M Kengen
The cytoplasmic membrane of a prokaryotic cell consists of a lipid bilayer or a monolayer that shields the cellular content from the environment. In addition, the membrane contains proteins that are responsible for transport of proteins and metabolites as well as for signalling and energy transduction. Maintenance of the functionality of the membrane during changing environmental conditions relies on the cell's potential to rapidly adjust the lipid composition of its membrane. Despite the fundamental chemical differences between bacterial ester lipids and archaeal ether lipids, both types are functional under a wide range of environmental conditions...
May 15, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28507520/in-vitro-and-in-silico-antidiabetic-and-antimicrobial-evaluation-of-constituents-from-kickxia-ramosissima-nanorrhinum-ramosissimum
#12
Adnan Amin, Emmy Tuenter, Kenn Foubert, Jamhsed Iqbal, Paul Cos, Louis Maes, Vassiliki Exarchou, Sandra Apers, Luc Pieters
Background and Aims:Kickxia ramosissima (Wall.) Janch (or Nanorrhinum ramosissimum (Wall.) Betsche is a well-known medicinal plant in Pakistan that is traditionally used in diabetic and inflammatory conditions. Because little information is available on its phytochemical composition, a range of constituents were isolated and evaluated in vitro in assays related to the traditional use. Methods: Dried whole plant material was extracted and chromatographically fractionated. Isolated constituents were evaluated in silico and in vitro in assays related to the traditional use against diabetes (inhibition of α-glucosidase activity; inhibition of advanced glycation endproducts) and in inflammatory conditions (inhibition of AAPH induced linoleic acid peroxidation, inhibition of 15-LOX, antimicrobial activity)...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28505403/prediction-of-the-wetting-behavior-of-active-and-hole-transport-layers-for-printed-flexible-electronic-devices-using-molecular-dynamics-simulations
#13
Rahul Bhowmik, Rajiv J Berry, Michael F Durstock, Benjamin J Leever
Molecular dynamics (MD) simulations were used to predict the wetting behavior of materials typical of active and hole-transport layers in organic electronics by evaluating their contact angles and adhesion energies. The active layer (AL) here consists of a blend of poly(3-hexylthiophene) and phenyl-C61-butyric acid methyl ester (P3HT:PCBM), whereas the hole-transport layer (HTL) consists of a blend of poly(3,4-ethylenedioxythiophene) and poly(styrene sulfonate) (PEDOT:PSS). Simulations of the wetting of these surfaces by multiple solvents show that formamide, glycerol, and water droplet contact angle trends correlate with experimental values...
May 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28504126/chemical-modification-of-nanocellulose-with-canola-oil-fatty-acid-methyl-ester
#14
Liqing Wei, Umesh P Agarwal, Kolby C Hirth, Laurent M Matuana, Ronald C Sabo, Nicole M Stark
Cellulose nanocrystals (CNCs), produced from dissolving wood pulp, were chemically functionalized by transesterification with canola oil fatty acid methyl ester (CME). CME performs as both the reaction reagent and solvent. Transesterified CNC (CNCFE) was characterized for their chemical structure, morphology, crystalline structure, thermal stability, and hydrophobicity. Analysis by Fourier transform infrared (FTIR) and FT-Raman spectroscopies showed that the long chain hydrocarbon structure was successfully grafted onto CNC surfaces...
August 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28504017/chemical-composition-antioxidant-and-cytotoxic-activities-of-extracts-from-the-leaves-of-smilax-brasiliensis-sprengel-smilacaceae
#15
Paula Avelar Amado, Vany Ferraz, Denise Brentan da Silva, Carlos Alexandre Carollo, Ana Hortência Fonsêca Castro, Lima Luciana Alves Rodrigues Dos Santos
The antioxidant and cytotoxic activities of petroleum ether and methanol extracts, fatty acids and methyl esters from leaves of Smilax brasiliensis were evaluated, and the composition of the extracts was determined. Palmitic, linoleic and linolenic acids were major components of the extracts. For antioxidant activity, all samples exhibited IC50 values lower than BHT (2,6-di-tert-butyl-4-methylphenol). The extracts, fatty acids and methyl esters from S. brasiliensis presented no toxicity to larvae of the brine shrimp, Artemia salina...
May 15, 2017: Natural Product Research
https://www.readbyqxmd.com/read/28501730/larvicidal-activity-of-vegetable-oils-and-esterified-compounds-against-culex-quinquefasciatus-diptera-culicidae
#16
José A Ribeiro-Neto, Maria Eduarda A Pinto, Vanessa V Ferreira, Jacqueline D Tibúrcio, Fernando P Varotti, Dihego O Azevedo, Ezequias P Siqueira-Filho, José E Serrão, Luciana A Santos Lima, Stenio Nunes Alves
Control of Culex quinquefasciatus using chemical insecticides may result in the selection of resistant mosquito strains. Thus, the use of plant-derived products has been studied as alternative for the mosquito control. Fatty acid methyl esters (FAMEs) obtained by transesterification of vegetable oils may result in compounds with larvicidal potential against C. quinquefasciatus. However, little is known about the morphological, physiological or biochemical effects that these FAMEs may have on mosquito larvae...
May 11, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28500884/rapid-biodiesel-synthesis-from-waste-pepper-seeds-without-lipid-isolation-step
#17
Jechan Lee, Jieun Kim, Yong Sik Ok, Eilhann E Kwon
In situ transformation of lipid in waste pepper seeds into biodiesel (i.e., fatty acid methyl esters: FAMEs) via thermally-induced transmethylation on silica was mainly investigated in this study. This study reported that waste pepper seeds contained 26.9wt% of lipid and that 94.1% of the total lipid in waste pepper seeds could be converted into biodiesel without lipid extraction step for only ∼1min reaction time. This study also suggested that the optimal temperature for in situ transmethylation was identified as 390°C...
May 5, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28499304/isolation-and-structure-characterization-of-cytotoxic-phorbol-esters-from-the-seeds-of-croton-tiglium
#18
Qizhen Du, Yongchun Zhao, Hongchun Liu, Chunping Tang, Minmin Zhang, Changqiang Ke, Yang Ye
Nine new and eleven known phorbol esters were isolated from an acetone extract of the seeds of Croton tiglium. Their structures were determined by extensive analysis of spectroscopic data. Eleven of these compounds were evaluated for their inhibition activity on human tumor cell lines HL-60 and lung carcinoma A549. 12-O-Tiglylphorbol-13-acetate (11), 12-O-(2-methyl)-butyrylphorbol-13-aetate (12), and 12-O-tiglylphorbol-13-isobutyrate (13) exhibited strong inhibition activity against both HL-60 and A549 cell lines with IC50 values ≤ 0...
May 12, 2017: Planta Medica
https://www.readbyqxmd.com/read/28498668/kinetics-of-the-reactions-of-no3-radical-with-methacrylate-esters
#19
Li Zhou, A R Ravishankara, Steven S Brown, Mahmoud Idir, Kyle J Zarzana, Veronique Daele, Abdelwahid Mellouki
Two different experimental methods (relative rate and absolute rate methods) were used to measure the rate coefficients for the reactions of NO3 radical with six methacrylate esters: methyl methacrylate (MMA, k1), ethyl methacrylate (EMA, k2), propyl methacrylate (PMA, k3), isopropyl methacrylate (IPMA, k4), butyl methacrylate (BMA, k5), isobutyl methacrylate (IBMA, k6). In the relative rate method, the loss of the esters relative to that of a reference compound was followed in a 7300 L Teflon-walled chamber at (298±2) K and (1000±5) hpa...
May 12, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28496524/long-term-stability-and-reusability-of-molecularly-imprinted-polymers
#20
Jozsef Kupai, Mayamin Razali, Sibel Buyuktiryaki, Rustem Kecili, Gyorgy Szekely
Molecularly imprinted materials are man-made mimics of biological receptors. Their polymer network has recognition sites complementary to a substrate in terms of size, shape and chemical functionality. They have diverse applications in various chemical, biomedical and engineering fields such as solid phase extraction, catalysis, drug delivery, pharmaceutical purification, (bio)sensors, water treatment, membrane separations and proteomics. The stability and reusability of molecularly imprinted polymers (IPs) have crucial roles in developing applications that are reliable, economic and sustainable...
January 28, 2017: Polymer Chemistry
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