Search results for: (2R)-2-Amino-1,2,3,4-tetrahydro-5,8-dimethoxy-2-naphthalenecarboxylic Acid Methyl Ester-13C C1313CH19NO4 CAS:
#32626308 2019/05/16 To Up
Safety assessment of the substance phosphorous acid, triphenyl ester, polymer with alpha-hydro-omega-hydroxypoly[oxy(methyl-1,2-ethanediyl)], C10-16 alkyl esters, for use in food contact materials.T
, Vittorio Silano, José Manuel Barat Baviera, Claudia Bolognesi, Beat Johannes Brüschweiler, Andrew Chesson, Pier Sandro Cocconcelli, Riccardo Crebelli, David Michael Gott, Konrad Grob, Evgenia Lampi, Alicja Mortensen, Inger-Lise Steffensen, Christina Tlustos, Henk Van Loveren, Laurence Vernis, Holger Zorn, Laurence Castle, Roland Franz, Maria Rosaria Milana, Karla Pfaff, Detlef Wölfle, Ellen Van Haver, Gilles Rivière
2209 related Products with: Safety assessment of the substance phosphorous acid, triphenyl ester, polymer with alpha-hydro-omega-hydroxypoly[oxy(methyl-1,2-ethanediyl)], C10-16 alkyl esters, for use in food contact materials.1 g2 g10 mg10 mg25 mg25 mg10 mg5 mg10 mg1 mg25 mg250 mg
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#32508085 2020/06/17 To Up
Fuller-Rylenes: Paving the Way for Promising Acceptors.T
Jiajing Feng, Huiting Fu, Wei Jiang, Andong Zhang, Hwa Sook Ryu, Han Young Woo, Yanming Sun, Zhaohui Wang500 ml100Tests96 Well 1 G 2x5Lmin 2 cartons 5 G0.1 mg100.00 ul
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#32506821 2020/06/07 To Up
Fluorobenziodoxole-BF Reagent for Iodo(III)etherification of Alkynes in Ethereal Solvent.A combination of fluorobenziodoxole (FBX) and BF ⋅ OEt in cyclopentyl methyl ether promotes regio- and stereoselective addition of benziodoxole and methoxy groups to alkynes. This difunctionalization reaction tolerates a variety of functionalized internal and terminal alkynes to afford trans-β-alkoxyvinylbenziodoxoles, which represent versatile precursors to stereochemically well-defined multisubstituted vinyl ethers. The reaction is proposed to involve cleavage of the I-F bond of FBX by BF , followed by electrophilic activation of the alkyne by the resulting cationic I species that triggers the nucleophilic addition of the ethereal oxygen.
Jinkui Chai, Wei Ding, Junliang Wu, Naohiko Yoshikai
1136 related Products with: Fluorobenziodoxole-BF Reagent for Iodo(III)etherification of Alkynes in Ethereal Solvent.1 G1,000 tests250 ml 1 G250 mg1 LITRE 5 G100 ml500 MG 100 G
#32432392 2020/05/20 To Up
Feeding of pea leafminer larvae simultaneously activates jasmonic and salicylic acid pathways in plants to release a terpenoid for indirect defense.The pea leafminer, Liriomyza huidobrensis, is an important pest species affecting ornamental crops worldwide. Plant damage consists of oviposition and feeding punctures created by female adult flies as well as larva-bored mines in leaf mesophyll tissues. How plants indirectly defend themselves from these two types of leafminer damage has not been sufficiently investigated. In this study, we compared the indirect defense responses of bean plants infested by either female adults or larvae. Puncturing of leaves by adults released green leaf volatiles and terpenoids, while larval feeding caused plants to additionally emit methyl salicylate and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT). Puncturing of plants by female adults induced increases in jasmonic acid (JA) and JA-related gene expressions but reduced the expressions of salicylic acid (SA)-related genes. In contrast, JA and SA and their-related gene expression levels were increased significantly by larval feeding. The exogenous application of JA+SA significantly triggered TMTT emission, thereby significantly inducing the orientation behavior of parasitoids. Our study has confirmed that larval feeding can trigger TMTT emission through the activation of both JA and SA pathways to attract parasitoids; however, TMTT alone is less attractive than the complete blend of volatiles released by infested plants. This article is protected by copyright. All rights reserved.
Jun-Nan Yang, Jia-Ning Wei, Le Kang
1120 related Products with: Feeding of pea leafminer larvae simultaneously activates jasmonic and salicylic acid pathways in plants to release a terpenoid for indirect defense.1 G100 μl100ug Lyophilized 1 G 25 G 100 G 1 G100ug10 mg 100 G
#32351491 2020/04/15 To Up
Low Nitrogen Fertilization Alter Rhizosphere Microorganism Community and Improve Sweetpotato Yield in a Nitrogen-Deficient Rocky Soil.Sweetpotato can be cultivated in the reclaimed rocky soil in Sichuan Basin, China, which benefits from the release of mineral nutrients in the rocky soil by microorganisms. Shortage of nitrogen (N) in the rocky soil limits sweetpotato yield, which can be compensated through N fertilization. Whereas high N fertilization inhibits biological N fixation and induces unintended environmental consequences. However, the effect of low N fertilization on microorganism community and sweetpotato yield in the N-deficient rocky soil is still unclear. We added a low level of 1.5 g urea/m to a rocky soil cultivated with sweetpotato, and measured rocky soil physiological and biochemical properties, rhizosphere microbial diversity, sweetpotato physiological properties and transcriptome. When cultivating sweetpotato in the rocky soil, low N fertilization (1.5 g urea/m) not only improved total N (TN) and available N (AN) in the rocky soil, but also increased available phosphorus (AP), available potassium (AK), and nitrogenase and urease activity. Interestingly, although low N fertilization could reduce bacterial diversity through affecting sweetpotato root exudates and rocky soil properties, the relative abundance of P and K-solubilizing bacteria, N-fixing and urease-producing bacteria increased under low N fertilization, and the relative abundance of plant pathogens decreased. Furthermore, low N fertilization increased the phytohormones, such as zeatin riboside, abscisic acid, and methyl jasmonate contents in sweetpotato root. Those increases were consistent with our transcriptome findings: the inhibition of the lignin synthesis, the promotion of the starch synthesis, and the upregulated expression of , thus resulting in promoting the formation of tuberous roots and further increasing the sweetpotato yield by half, up to 3.3 kg/m. This study indicated that low N fertilization in the N-deficient rocky soil improved this soil quality through affecting microorganism community, and further increased sweetpotato yield under regulation of phytohormones pathway.
Yanqiang Ding, Yanling Jin, Kaize He, Zhuolin Yi, Li Tan, Lisha Liu, Mingshuang Tang, Anping Du, Yang Fang, Hai Zhao
1732 related Products with: Low Nitrogen Fertilization Alter Rhizosphere Microorganism Community and Improve Sweetpotato Yield in a Nitrogen-Deficient Rocky Soil.100.00 ug100 assays100 μg100 μg100ug Lyophilized100 μg1 Set4 Membranes/Box100 μg1 Set
#32329349 2020/04/24 To Up
Postulated Biogenesis-Guided Total Synthesis and Structural Revision of 2,18--Lankacidinol A.The macrocyclic structure of 2,18--lankacidinol A, a newly isolated antitumor antibiotic, has been revised on the basis of a concise modular synthesis inspired by a reconsidered biosynthetic proposal. Notable features include (1) an acid-promoted intramolecular transacetalization of a -lactoyl--methyl-,-acetal to construct the 4-oxazolidinone ring and (2) late-stage β-keto imide aldolizations that give rise to facile, stereodivergent access to all lactonic diastereomers.
Kuan Zheng, Ran Hong
1071 related Products with: Postulated Biogenesis-Guided Total Synthesis and Structural Revision of 2,18--Lankacidinol A.1 kit(96 Wells)1 kit1,000 tests200ug480/kit1 mgOne 96-Well Strip Micropl100 Rxns Kit96 wells (1 kit)200ug
#32286049 2020/04/23 To Up
Ultrafast Photocatalytic Reaction Screening by Mass Spectrometry.Here we report a semiconductor-assisted laser desorption/ionization mass spectrometry (SA-LDI MS) platform to monitor photocatalytic reactions online and apply it for ultrafast reaction screening. In this method, we use photocatalytic nanomaterials as the substrate for LDI and then initiate and monitor the reactions simultaneously. The features of our method include the following: (i) It has a reaction acceleration effect: only seconds are needed in our interfacial reactions vs hours in conventional bulk phase. (ii) The reaction trend in our system agrees with that in bulk phase. (iii) By adding a stable analogue of reactant as internal standard, a quantification of the reaction can be achieved. (iv) The sensitivity is high: for 500 amol of reactant, the photocatalytic reaction can still be initiated and detected. This platform has advantages in ultrafast reaction screening (e.g., screening of nine catalysts requires 24 h by the UPLC-MS system but only 10 min by SA-LDI MS). Furthermore, the high specificity of MS enables the screening of catalytic selectivity of A-TiO nanoparticles for a methyl red (MR) and acid yellow (AY) mixture, whose absorption wavelengths are overlapped and thus cannot be discriminated by conventional optical methods. Furthermore, by using SA-LDI MS, we also monitored reductive debrominations during the degradation process of polybrominated diphenyl ethers (PBDEs), which is a type of important pollutant that is difficult to degrade and detect in liquid phase, and the photocatalytic reduction of CO. Overall, SA-LDI MS realizes ultrafast photocatalytic reaction screening for the first time and provides practical analytical value in the field of catalyst screening.
Jie Sun, Yuming Jiang, Huihui Liu, Xi Huang, Caiqiao Xiong, Zongxiu Nie250 Units 1 kit(s) 5.0 ml (200 PCR reactions 100 reactions 50000 Units4X1.25ml; 200 reactions (1 kit32 reactions5 reactions
#32280504 2020/03/17 To Up
Crystal structure of (,)-2-hy-droxy-4-(methyl-sulfan-yl)butanoic acid.The title compound, a major animal feed supplement, abbreviated as HMTBA and alternatively called dl-me-thio-nine hy-droxy analogue, CHOS, (), was isolated in pure anhydrous monomeric form. The melting point is 302.5 K and the compound crystallizes in the monoclinic space group 2/, with two conformationally non-equivalent mol-ecules [( ) and ( )] in the asymmetric unit. The crystal structure is formed by alternating polar and non-polar layers running along the plane and features an extensive hydrogen-bonding network within the polar layers. The Hirshfeld surface analysis revealed a significant contribution of non-polar H⋯H and H⋯S inter-actions to the packing forces for both mol-ecules.
Thomas P Mawhinney, Yiyi Li, Deborah L Chance, Steven P Kelley, Valeri V Mossine10 mg1 mg25 mg10 mg1 g10 mg250 mg10 mg10 mg1 g 100 G100 mg
#32234222 2020/02/03 To Up
Expression characteristics and function of CAS and a new beta-amyrin synthase in triterpenoid synthesis in birch (Betula platyphylla Suk.).Triterpenoids produced by the secondary metabolism of Betula platyphylla Suk. exhibit important pharmacological activities, such as tumor inhibition, anti-HIV, and defense against pathogens, but the yield of natural synthesis is low, which is insufficient to meet people's needs. In this study, we identified two OSC genes of birch, named as BpCAS and Bpβ-AS, respectively. The expression of BpCAS and Bpβ-AS were higher levels in roots and in stems, respectively, and they induced expression in response to methyl jasmonate (MeJA), gibberellin (GA3), abscisic acid (ABA), ethylene and mechanical damage. The function of the two genes in the triterpene synthesis of birch was identified by reverse genetics. The inhibition of Bpβ-AS gene positively regulates synthesis of betulinic acid. BpCAS interference can significantly promote the upregulation of lupeol synthase gene (BPW) and β-amyrin synthase gene(BPY), and conversion of 2,3-oxidosqualene to the downstream products betulinic acid and oleanolic acid. This study provided a basis for the genetic improvement of triterpenoid synthesis in birch through genetic engineering. The obtained transgenic birch and suspension cells served as material resources for birch triterpenoid applications in further.
Jing Yin, Jie Yang, Hongsi Ma, Tian Liang, Ying Li, Jialei Xiao, Hongmei Tian, Zhiqiang Xu, Yaguang Zhan
2556 related Products with: Expression characteristics and function of CAS and a new beta-amyrin synthase in triterpenoid synthesis in birch (Betula platyphylla Suk.).20
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