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https://www.readbyqxmd.com/read/28550630/the-effects-of-different-sewage-sludge-amendment-rates-on-the-heavy-metal-bioaccumulation-growth-and-biomass-of-cucumbers-cucumis-sativus-l
#1
Ebrahem M Eid, Sulaiman A Alrumman, Ahmed F El-Bebany, Abd El-Latif Hesham, Mostafa A Taher, Khaled F Fawy
When sewage sludge is incorrectly applied, it may adversely impact agro-system productivity. Thus, this study addresses the reaction of Cucumis sativus L. (cucumber) to different amendment rates (0, 10, 20, 30, 40 and 50 g kg(-1)) of sewage sludge in a greenhouse pot experiment, in which the plant growth, heavy metal uptake and biomass were evaluated. A randomized complete block design with six treatments and six replications was used as the experimental design. The soil electrical conductivity, organic matter and Cr, Fe, Zn and Ni concentrations increased, but the soil pH decreased in response to the sewage sludge applications...
May 26, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28550063/an-environment-friendly-engineered-azotobacter-can-replace-substantial-amount-of-urea-fertilizer-and-yet-sustain-same-wheat-yield
#2
Umesh K Bageshwar, Madhulika Srivastava, Pedisetty Pardha-Saradhi, Sangeeta Paul, Sellamuthu Gothandapani, Ranjeet S Jaat, Prabha Shankar, Rajbir Yadav, Dipak R Biswas, Polumetla A Kumar, Jasdeep C Padaria, Pranab K Mandal, Kannepalli Annapurna, Hirendra K Das
In our endeavor to improve upon nitrogen fixation efficiency of a soil diazotroph that would be unaffected by synthetic nitrogenous fertilizers, we have deleted a part of the negative regulatory gene nifL and constitutively expressed the positive regulatory gene nifA in the chromosome of Azotobacter chroococcum CBD15, a strain isolated from the local field soil. No antibiotic resistance gene or other foreign gene was there in the chromosome of the engineered strain. Wheat seeds inoculated with this engineered strain, which we have named Azotobacter chroococcum HKD15, were tested for three years in pots and one year in the field...
May 26, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28549890/-18-f-labeled-indole-based-analogs-as-highly-selective-radioligands-for-imaging-sigma-2-receptors-in-the-brain
#3
Liang Wang, Jiajun Ye, Yingfang He, Winnie Deuther-Conrad, Jinming Zhang, Xiaojun Zhang, Mengchao Cui, Jörg Steinbach, Yiyun Huang, Peter Brust, Hongmei Jia
We have designed and synthesized a series of indole-based σ2 receptor ligands containing 5,6-dimethoxyisoindoline or 6,7-dimethoxy-1,2,3,4-tetrahydroisoquinoline as pharmacophore. In vitro competition binding assays showed that all ten ligands possessed low nanomolar affinity (Ki=1.79-5.23nM) for σ2 receptors and high subtype selectivity (Ki (σ2)/Ki (σ1)=56-708). Moreover, they showed high selectivity for σ2 receptor over the vesicular acetylcholine transporter (>1000-fold). The corresponding radiotracers [(18)F]16 and [(18)F]21 were prepared by an efficient one-pot, two-step reaction sequence with a home-made automated synthesis module, with 10-15% radiochemical yield and radiochemical purity of >99%...
May 10, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28548856/decorated-cyclopentadienes-from-acetylene-and-ketones-in-just-two-steps
#4
Elena Yu Schmidt, Ivan A Bidusenko, Igor' A Ushakov, Alexander V Vashchenko, Boris A Trofimov
The products of the one-pot assembly of acetylene and ketones in the KOH/DMSO system, 7-methylene-6,8-dioxabicyclo[3.2.1]octanes, undergo an acid-catalyzed (CF3COOH, room temperature) rearrangement to rarely substituted cyclopentadienes in good-to-excellent yields. The mechanism of the rearrangement has been supported by the isolation and corresponding transformations of two intermediates.
May 26, 2017: Organic Letters
https://www.readbyqxmd.com/read/28548159/synthesis-of-tetrafluoroethylene-and-tetrafluoroethyl-containing-azides-and-their-1-3-dipolar-cycloaddition-as-synthetic-application
#5
Svatava Voltrová, Mickaël Muselli, Josef Filgas, Václav Matoušek, Blanka Klepetářová, Petr Beier
Tetrafluoroethylene-containing azides are accessed in two steps (one pot) from tetrafluoroalkyl bromides by metalation and reaction with electrophilic azides. Subsequent copper(i)-catalyzed azide-alkyne cycloaddition afforded N-tetrafluoroethyl and N-tetrafluoroethylene 4-substituted 1,2,3-triazoles. In addition, the protocol for the synthesis of 4,5-disubstituted 1,2,3-triazoles is presented.
May 26, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28544574/reversing-polarity-carbonyl-%C3%AE-aminations-with-nitrogen-nucleophiles
#6
Aurelien de la Torre, Veronica Tona, Nuno Maulide
The synthesis of alpha-amino carbonyl compounds is an important challenge in synthesis en route to biologically essential structures. While classical approaches involve the use of enol or enolate chemistries in combination with an electrophilic source of nitrogen, those strategies usually necessitate further transformations in order to reach the desired targets. In recent years, a new approach arose involving the direct use of nucleophilic sources of nitrogen along with an oxidant. This advantageously leads in one-pot to the biologically relevant alpha-amino compounds, without further transformation required...
May 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544471/aziridine-mediated-ligation-at-phenylalanine-and-tryptophan-sites
#7
Kiran Bajaj, Rajeev Sakhuja
An efficient approach towards peptide synthesis has been described that allows an easy access to variety of small peptides via one-pot aziridine-mediated ligation-desulfurization strategy. The present protocol afforded a library of phenylalanine and tryptophan containing α-peptides in good yields by regioselective ring-opening of aziridine-3-aryl-2-carboxylates with peptide thioacids followed by desulfurization.
May 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544306/high-fidelity-narcissistic-self-sorting-in-the-synthesis-of-organometallic-assemblies-from-poly-nhc-ligands
#8
Narayan Sinha, Tristan T Y Tan, Eduardo Peris, F Ekkehardt Hahn
Highly selective, narcissistic self-sorting has been observed in the one-pot synthesis of three organometallic molecular cylinders of type [M3 {L-(NHC)3 }2 ](PF6 )3 (M=Ag(+) , Au(+) ; L=1,3,5-benzene, triphenylamine, or 1,3,5-triphenylbenzene) from L-(NHC)3 and silver(I) or gold(I) ions. The molecular cylinders contain only one type of tris-NHC ligand with no crossover products detectable. Transmetalation of the tris-NHC ligands from Ag(+) to Au(+) in a one-pot reaction with retention of the supramolecular structures is also demonstrated...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544228/synthesis-of-benzodihydrofurans-by-asymmetric-c-h-insertion-reactions-of-donor-donor-carbenoids
#9
Jared Thomas Shaw, Kellan N Lamb, Richard A Squitieri, Srinivasa R Chintala, Ada J Kwong, Edward I Balmond, Cristian Soldi, Olga Dmytrenko, Marta Castiñeira Reis, Ryan Chung, J Bennett Addison, James C Fettinger, Jason C Hein, Dean J Tantillo, Joseph M Fox
Metal carbenoids appended with two electron-donating groups, known as "donor/donor" carbenoids, undergo diastereo- and enantioselective rhodium-catalyzed C-H insertion reactions with ether substrates to form benzodihydrofurans. Unlike the reactions of carbenoids with electron-withdrawing groups attached, the attenuated electrophilicity enables these reactions to be conducted in Lewis basic solvents (e.g., acetonitrile) and in the presence of water. The diazo precursors for these species are prepared in situ from hydrazone using a mild and chemoselective oxidant (MnO2)...
May 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543986/a-case-of-primordial-odontogenic-tumor-a-new-entity-in-the-latest-who-classification-2017
#10
Toshinori Ando, Madhu Shrestha, Takashi Nakamoto, Kaori Uchisako, Sachiko Yamasaki, Koichi Koizumi, Ikuko Ogawa, Mutsumi Miyauchi, Takashi Takata
Primordial odontogenic tumor (POT) is a rare lesion in the jaw which has been included as a new entity of benign mixed epithelial and mesenchymal odontogenic tumour in the latest World Health Organization (WHO) classification (2017). Only seven cases have been reported. It typically occurs in the posterior mandible. We report an additional case of POT in the maxilla of an 8-year-old girl presenting with an asymptomatic buccal enlargement. A well-defined, unilocular, radiolucent lesion was observed radiographically...
May 25, 2017: Pathology International
https://www.readbyqxmd.com/read/28542385/cadmium-toxicity-induced-contrasting-patterns-of-concentrations-of-free-sarcosine-specific-amino-acids-and-selected-microelements-in-two-noccaea-species
#11
Veronika Zemanová, Milan Pavlík, Daniela Pavlíková
Cadmium (Cd) toxicity affects numerous metabolic processes in plants. In the presence of Cd, plants accumulate specific amino acids which may be beneficial to developing Cd tolerance. Our study aimed to characterize the changes in the metabolism of selected free amino acids that are associated with Cd tolerance, and investigate the levels of selected microelements in order to relate these changes to the adaptation strategies of two metallophytes-Noccaea caerulescens (Redlschlag, Austria) and Noccaea praecox (Mežica, Slovenia)...
2017: PloS One
https://www.readbyqxmd.com/read/28541720/assessment-of-hydrocarbon-degradation-potentials-in-plant-microbe-interaction-system-with-oil-sludge-contamination-a-sustainable-solution
#12
Monika Dhote, Anil Kumar, Anjana Jajoo, Asha Juwarkar
A pot culture experiment was conducted for 90 days for evaluation of oil and total petroleum hydrocarbon (TPH) degradation in vegetated and non-vegetated treatments of real field oil sludge contaminated soil. Five different treatments include, (T1) control, 2% oil sludge contaminated soil; (T2), augmentation of microbial consortium; (T3), Vertiver zizanioide; (T4), bio-augmentation along with Vertiver zizanioide and (T5), bio-augmentation with Vertiver zizanioide and bulking agent. During the study, oil reduction, TPH and degradation of its fractions was determined...
May 25, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/28541704/asymmetric-synthesis-of-amino-bis-pyrazolone-derivatives-via-an-organocatalytic-mannich-reaction
#13
Pankaj Chauhan, Suruchi Mahajan, Ugur Kaya, Anssi Peuronen, Kari Rissanen, Dieter Enders
A new series of N-Boc ketimines derived from pyrazolin-5-ones have been used as electrophiles in asymmetric Mannich reactions with pyrazolones. The amino-bis-pyrazolone products are obtained in excellent yields and stereoselectivities by employing a very low loading of 1 mol% of a bifunctional squaramide organocatalyst. Depending on the substitution in the 4-position of the pyrazolones the new protocol allows for the generation of one or two tetra-substituted stereocenters including a one-pot version combing the Mannich reaction with a base mediated halogenation...
May 25, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28541696/reversible-redox-activity-in-multicomponent-metal-organic-frameworks-constructed-from-trinuclear-copper-pyrazolate-building-blocks
#14
Binbin Tu, Qingqing Pang, Huoshu Xu, Xiaomin Li, Yulin Wang, Zhen Ma, Linhong Weng, Qiaowei Li
Inorganic functionalization of metal-organic frameworks (MOFs), such as incorporating multiple inorganic building blocks with distinct metals into one structure and further modulating the metal charges, endows the porous materials with significant properties towards their applications in catalysis. In this report, by exploring the role of 4-pyrazolecarboxylic acid (H2PyC) in the formation of trinuclear copper pyrazolate as a metalloligand in situ, four new MOFs with multiple components in order were constructed through one-pot synthesis...
May 25, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28541682/powerful-thermally-stable-one-pot-preparable-and-recyclable-electrophilic-trifluoromethylating-agents-2-8-difluoro-and-2-3-7-8-tetrafluoro-s-trifluoromethyl-dibenzothiophenium-salts
#15
Teruo Umemoto, Bin Zhang, Tianhao Zhu, Xiaocong Zhou, Peng Zhang, Song Hu, Yuanqiang Li
Although many electrophilic trifluoromethylating agents have been reported to date, practically useful reagents have yet to be developed. S-(Trifluoromethyl)dibenzothiophenium salts, known as Umemoto's reagents, have two significant drawbacks that have hampered their practical application: (1) synthesis involving many steps and (2) the formation of large amounts of dibenzothiophene as waste after trifluoromethylation. Our idea to substitute fluorine at specific positions on the dibenzothiophenium rings has resulted in massive improvements in the synthesis, properties, reactivity, and applications of these compounds...
May 25, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28541559/hydraulic-redistribution-under-moderate-drought-among-english-oak-european-beech-and-norway-spruce-determined-by-deuterium-isotope-labeling-in-a-split-root-experiment
#16
Benjamin D Hafner, Martina Tomasella, Karl-Heinz Häberle, Marc Goebel, Rainer Matyssek, Thorsten E E Grams
Hydraulic redistribution (HR) of soil water through plant roots is a crucial phenomenon improving the water balance of plants and ecosystems. It is mostly described under severe drought, and not yet studied under moderate drought. We tested the potential of HR under moderate drought, hypothesizing that (H1) tree species redistribute soil water in their roots even under moderate drought and that (H2) neighboring plants are supported with water provided by redistributing plants. Trees were planted in split-root systems with one individual (i...
May 24, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28537716/one-pot-hydrothermal-synthesis-of-tb-iii-13-geo4-6o7-oh-and-k2tb-iv-ge2o7-preparation-of-a-stable-terbium-4-complex
#17
Kyle Fulle, Liurukara D Sanjeewa, Colin D McMillen, Yimei Wen, Apeksha C Rajamanthrilage, Jeffrey N Anker, George Chumanov, Joseph W Kolis
Two terbium germanates have been synthesized via high-temperature and high-pressure hydrothermal synthesis with 20 M KOH as a mineralizer using Tb4O7 as a starting material. Tb13(GeO4)6O7(OH) crystallizes in trigonal space group R3̅, is built up of isolated GeO4 units, and contains a complex arrangement of terbium oxide polyhedra. K2TbGe2O7 is a terbium(4+) pyrogermanate that is isostructural with K2ZrGe2O7 and displays a rare stable Tb(4+) oxidation state in the solid state.
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28537715/facile-synthesis-of-cu-nicu-electrocatalysts-integrating-alloy-core-shell-and-one-dimensional-structures-for-efficient-methanol-oxidation-reaction
#18
Dengfeng Wu, Wei Zhang, Daojian Cheng
The design and development of low-cost Pt-free, high-active and durable noble-metal-free electrocatalysts for methanol electrooxidation is highly desirable but remains a challenge. Herein, unique Cu/NiCu nanowires (NWs) integrating alloy, core-shell and one-dimensional structures are prepared by a facile one-pot strategy. It is found that Ni-Cu surface alloying structure can effectively change the charge distribution of atomic configuration, core-shell structure can be optimally the usage of Ni and Cu, and one-dimensional structure can effectively enhance the charge transfer between electrode surface and active sites, making the prepared NWs as promising electrocatalysts...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537396/stereoselective-synthesis-of-quaternary-pyrrolidine-2-3-diones-and-%C3%AE-amino-acids
#19
Nataliia V Shymanska, Joshua G Pierce
A facile, diastereoselective synthesis of highly substituted pyrrolidine-2,3-diones is reported, along with the one-step conversion of these heterocycles to novel β-amino acids and further functionalized derivatives. This method involves an unusually mild, one-pot, three-component cyclization/allylation followed by a Claisen rearrangement to provide unusual pyrrolidinone products that are densely functionalized and contain an all-carbon quaternary stereocenter. The reported reaction sequence is operationally simple, exquisitely diastereoselective, and provides gram-scale access to valuable heterocyclic scaffolds and β-amino acids not readily accessible via existing approaches...
May 24, 2017: Organic Letters
https://www.readbyqxmd.com/read/28537390/synthesis-of-pyridobenzazepines-using-a-one-pot-rh-pd-catalyzed-process
#20
Heather Lam, Jennifer Tsoung, Mark Lautens
In recent years, our group has been developing multicatalytic reactions for the synthesis of biologically relevant heterocyclic compounds. An efficient dual-metal catalyzed reaction of electron-deficient o-chlorovinylpyridines with o-aminophenylboronic esters to access pyridobenzazepines is described. Combining a Rh(I)-catalyzed arylation followed by a Pd(0)-catalyzed C-N coupling, in a one-pot procedure, provides a simplified method to access heterocycles without workup and purification after each step. The substrate scope encompasses a variety of N-H and N-alkylated pyridobenzazepine variants with yields up to 93%...
May 24, 2017: Journal of Organic Chemistry
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