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https://www.readbyqxmd.com/read/28732173/exploring-the-potential-of-gametic-reconstruction-of-parental-genotypes-by-f-sub-1-sub-hybrids-as-a-bridge-for-rapid-introgression
#1
Charles H Cannon, C Lane Scher
Interspecific hybridization and genetic introgression are commonly observed in natural populations of many species, especially trees. Among oaks, gene flow between closely-related species has been well documented. And yet, hybridization does not lead to a 'melting pot', i.e. the homogenization of phenotypic traits. Here, we explore how the combination of several common reproductive traits and genomic biology could create an avenue for interspecific gene flow that partially explains this apparent paradox. During meiosis, F<sub>1</sub> hybrids will produce approximately (½)<sup>n</sup> 'reconstructed' parental gametes, where n equals the number of chromosomes...
July 21, 2017: Genome Génome / Conseil National de Recherches Canada
https://www.readbyqxmd.com/read/28731724/concurrent-hydrogenation-of-three-functional-groups-enables-synthesis-of-c3-homologated-nucleoside-amino-acids
#2
Venubabu Kotikam, Eriks Rozners
Internucleoside amide linkages are excellent mimics of phosphodiesters in RNA and may be used to optimize the properties of short interfering RNAs. Herein we report a remarkably straightforward, efficient and step economic synthesis of C3'-homologated uridine and adenosine amino acids starting from nucleosides in six steps (31% overall yield) and eight steps (16% overall yield), respectively. The key enabling step is a one-pot multifunctional group transformation including a stereoselective hydrogenation, termed "Global Hydrogenation"...
July 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28731717/hydrogen-bond-direction-enables-palladium-catalyzed-branch-and-enantioselective-allylic-aminations-and-beyond
#3
Ya-Ni Wang, Bao-Cheng Wang, Mao-Mao Zhang, Xiao-Wen Gao, Tian-Ren Li, Liang-Qiu Lu, Wen-Jing Xiao
The palladium-catalyzed branch- and enantioselective allylic amination of vinyl benzoxazinones was accomplished through controlling the hydrogen bond direction. This protocol provides a rapid and efficient route for synthesizing an important building block, chiral amino alkene, from widely available aliphatic amines in 64 → 99% yields with up to 99% ee. Furthermore, this transformation and the accompanying products were utilized to develop one-pot reactions through dual catalysis, affording chiral indolines with good synthetic efficiency and excellent enantiocontrol...
July 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28731709/agronomic-effectiveness-of-granulated-and-powdered-p-exchanged-mg-al-ldh-relative-to-struvite-and-map
#4
Maarten Everaert, Fien Degryse, Mike J McLaughlin, Dirk E De Vos, Erik Smolders
Layered double hydroxides (LDHs) used to recover P from wastewater have recently been proposed as new slow-release fertilizers. Here, the use of P-exchanged Mg-Al LDHs as powdered or granulated fertilizer is explored and compared with mono-ammonium phosphate (MAP), a fully water-soluble fertilizer, and with struvite, a recycled phosphate fertilizer with lower solubility. First, these three fertilizers were compared in a 100-day incubation experiment using P diffusion visualization and chemical analysis to assess P release from either granules or powdered fertilizer in three different soils...
July 21, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28731264/high-yield-synthesis-of-crystal-phase-heterostructured-4h-fcc-au-pd-core-shell-nanorods-for-electrocatalytic-ethanol-oxidation
#5
Ye Chen, Zhanxi Fan, Zhimin Luo, Xiaozhi Liu, Zhuangchai Lai, Bing Li, Yun Zong, Lin Gu, Hua Zhang
Noble-metal nanomaterials are attracting increasing research interest due to their promising applications in electrochemical catalysis, for example. Although great efforts have been devoted to the size-, shape-, and architecture-controlled synthesis of noble-metal nanomaterials, their crystal-phase-controlled synthesis is still in its infancy. Here, for the first time, this study reports high-yield synthesis of Au nanorods (NRs) with alternating 4H/face-centered cubic (fcc) crystal-phase heterostructures via a one-pot wet-chemical method...
July 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28727431/pd-catalyzed-iodide-promoted-%C3%AE-arylation-of-ketones-for-the-regioselective-synthesis-of-isocoumarins
#6
Alessandra Casnati, Raimondo Maggi, Giovanni Maestri, Nicola Della Ca', Elena Motti
A variety of isocoumarins have been synthesized directly from 2-halobenzoates and ketones through a palladium-catalyzed α-arylation step followed by an intramolecular cyclization process. The addition of iodide anions to the reaction mixture increased yields and selectivities especially when 2-bromobenzoates were employed. This phosphine-free one-pot synthesis features a high functional group tolerance and gives access to richly decorated isocoumarins. This general methodology was successful in the total synthesis of Xyridin A, an important natural product with antibacterial and antifungal activity...
July 20, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28727416/in-situ-electrochemical-sensing-and-real-time-monitoring-live-cells-based-on-freestanding-nanohybrid-paper-electrode-assembled-from-3d-functionalized-graphene-framework
#7
Yan Zhang, Jian Xiao, Qi-Ying Lv, Lu Wang, Xulin Dong, Muhammad Asif, Jinghua Ren, Wenshan He, Yimin Sun, Fei Xiao, Shuai Wang
In this work, we develop a new type of freestanding nanohybrid paper electrode assembled from 3D ionic liquid (IL) functionalized graphene framework (GF) decorated by gold nanoflowers (AuNFs), and explore its practical application in in-situ electrochemical sensing of live breast cell samples by real-time tracking biomarker H2O2 released from cells. The AuNFs modified IL functionalized GF (AuNFs/IL-GF) was synthesized via a facile and efficient dopamine assisted one-pot self-assembly strategy. The as-obtained nanohybrid assembly exhibits a typical 3D hierarchical porous structure, where the highly active electrocatalyst AuNFs are well dispersed on IL-GF scaffold...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28726952/porphyra-polysaccharide-derived-carbon-dots-for-non-viral-co-delivery-of-different-gene-combinations-and-neuronal-differentiation-of-ectodermal-mesenchymal-stem-cells
#8
Jiaxin Chen, Qiang Wang, Jie Zhou, Wenwen Deng, Qingtong Yu, Xia Cao, Jianping Wang, Fengxia Shao, Yang Li, Ping Ma, Myron Spector, Jiangnan Yu, Ximing Xu
In this study, multifunctional fluorescent carbon dots (CDs) were synthesized using a one-pot hydrothermal carbonization reaction, with the naturally-occurring porphyra polysaccharide (PPS) serving as a single carbon source for the first time and ethylenediamine (Ed) acting as the surface passivation agent. The resulting CDs enjoyed a high quantum yield (56.3%), excitation-dependent fluorescence, small size (<10 nm), spherical shape, uniform distribution, positive surface charge, low cytotoxicity and excellent ability to condense macromolecular plasmid DNA...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28726951/facile-one-pot-exfoliation-and-integration-of-2d-layered-materials-by-dispersion-in-a-photocurable-polymer-precursor
#9
Alberto Gallardo, Yanina Pereyra, Enrique Martínez-Campos, Carolina García, David Acitores, Isabel Casado-Losada, Marián A Gómez-Fatou, Helmut Reinecke, Gary Ellis, Diego Acevedo, Juan Rodríguez-Hernández, Horacio J Salavagione
Efficient exfoliation of graphene and related materials (GRM) and fast and inexpensive integration/assembly are crucial to fulfil their full potential. A high degree of exfoliation in organic media can be achieved with high boiling point liquids that usually leave residues after drying, which is a handicap for many applications. Here, the effective exfoliation and dispersion of GRM in a vinyl monomer, which is subsequently converted to a functional polymer by photopolymerization, is reported. Nanocomposite membranes and three-dimensional objects are produced by the photo-curing process and stereolithography 3D printing, respectively...
July 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28726757/characterization-of-essential-oil-composition-in-different-basil-species-and-pot-cultures-by-a-gc-ms-method
#10
Andrea Muráriková, Anton Ťažký, Jarmila Neugebauerová, Alexandra Planková, Josef Jampílek, Pavel Mučaji, Peter Mikuš
Basil (Ocimum L.) species are used as medicinal plants due to their essential oils exhibiting specific biological activity. The present work demonstrated that both the variety and season/conditions of cultivation had a significant effect on (i) the produced amount (extraction yield), (ii) qualitative, as well as (iii) quantitative profile of basil essential oil. Among studied basil varieties, a new variety, 'Mánes', was characterized for the first time. Based on our quantitative evaluation of GC-MS profiles, the following chemotypes and average concentrations of a main component were detected in the studied basil varieties: 'Ohře', 'Lettuce Leaf', 'Purple Opaal', 'Dark Green' (linalool, 5...
July 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28726710/using-amine-functionalized-magnetite-hollow-nanospheres-amhns-as-adsorbents-for-heavy-metal-ions
#11
Sen Lin, Lili Liu, Yong Yang, Wei Zhang, Meng Xu, Kuangfei Lin
In this paper, the amine-functionalized magnetite hollow nanospheres (AMHNs), prepared through a facile one-pot synthesis, were used as heavy metal ion adsorbents, whose morphology and physicochemical features were exploring by transmission electron microscopy, vibrating sample magnetometer, X-ray diffraction and Fourier-transform infrared analyses. Its adsorption performances for Pb(2+), Cu(2+), Zn(2+), Ni(2+) and Cd(2+) were studied in detail. The adsorption increased with the increase of initial pH value of the solution and could be obviously affected by ionic strength...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28726563/mechanically-strong-and-ph-responsive-carboxymethyl-chitosan-graphene-oxide-polyacrylamide-nanocomposite-hydrogels-with-fast-recoverability
#12
Yang Chen, Hongqiu Wang, Junrong Yu, Yan Wang, Jing Zhu, Zuming Hu
The biocompatible, quickly recoverable, mechanically strong and tough polymer hydrogels has great potential for biomedical applications. A novel carboxymethyl chitosan (CMCTs)/graphene oxide (GO)/polyacrylamide (PAM) nanocomposite (NC) hydrogel with excellent mechanical performance was synthesized through a facile, one-pot free radical polymerization, using GO nanosheets as the crosslink centers instead of toxic organic molecules. The content of GO nanosheets and CMCTs has great influence on the mechanical properties of CMCTs/GO/PAM NC hydrogels...
July 20, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28726406/regioselective-bromination-of-thieno-2-3-4-5-pyrrolo-1-2-d-1-2-4-triazin-8-7h-one-and-sequential-suzuki-couplings
#13
Chunliang Lu, Minyu Dong, Hugh Y Zhu
Regioselective bromination of thieno[2',3':4,5]pyrrolo[1,2-d][1,2,4]triazin-8(7H)-one at 2 or 9-position was achieved by modulating the basicity of the reaction conditions. An anion directed site-specific bromination mechanism was proposed. In addition, a one-pot bromination-Suzuki coupling protocol was developed for quick access of analogs at 9-position.
July 20, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28726228/microwave-irradiation-and-citric-acid-assisted-seed-germination-and-phytoextraction-of-nickel-ni-by-brassica-napus-l-morpho-physiological-and-biochemical-alterations-under-ni-stress
#14
Mujahid Farid, Shafaqat Ali, Muhammad Rizwan, Rashid Saeed, Hafiz Muhammad Tauqeer, Rasham Sallah-Ud-Din, Ahmed Azam, Nighat Raza
The complex bio-geochemistry of soil allows pollutant to persist for a longer period of time which further decreased the fertility and natural composition of land. Nickel, an inorganic pollutant, coming from a wide range of industrial and manufacturing units possesses serious threat to soil degradation and crop productivity around the world. The present study was carried to evaluate the combined role of microwave irradiation (MR) and citric acid (CA) on the phytoextraction potential of Brassica napus L. under Ni stress...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28724908/design-and-discovery-of-novel-monastrol-1-3-5-triazines-as-potent-anti-breast-cancer-agent-via-attenuating-epidermal-growth-factor-receptor-tyrosine-kinase
#15
Jitendra Kumar Srivastava, Girinath G Pillai, Hans Raj Bhat, Amita Verma, Udaya Pratap Singh
A novel series of hybrid analogues of monastrol-1,3,5-triazine were designed and developed via one-pot synthesis using Bi(NO3)3 as a catalyst. Entire compounds were evaluated for their anticancer activity against HeLa (cervical cancer), MCF-7 (breast cancer), HL-60 (Human promyelocytic leukemia), HepG2 (Hepatocellular carcinoma) and MCF 12A (normal epithelial breast cell line) using MTT assay, where they showed highest inhibitory activity against MCF-7. The molecules were also found to be non-toxic to MCF 12A cells...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723895/visible-light-driven-methane-formation-from-co2-with-a-molecular-iron-catalyst
#16
Heng Rao, Luciana C Schmidt, Julien Bonin, Marc Robert
Converting CO2 into fuel or chemical feedstock compounds could in principle reduce fossil fuel consumption and climate-changing CO2 emissions. One strategy aims for electrochemical conversions powered by electricity from renewable sources, but photochemical approaches driven by sunlight are also conceivable. A considerable challenge in both approaches is the development of efficient and selective catalysts, ideally based on cheap and Earth-abundant elements rather than expensive precious metals. Of the molecular photo- and electrocatalysts reported, only a few catalysts are stable and selective for CO2 reduction; moreover, these catalysts produce primarily CO or HCOOH, and catalysts capable of generating even low to moderate yields of highly reduced hydrocarbons remain rare...
July 17, 2017: Nature
https://www.readbyqxmd.com/read/28723092/microwave-assisted-synthesis-of-diversely-substituted-quinoline-based-dihydropyridopyrimidine-and-dihydropyrazolopyridine-hybrids
#17
Daniel Insuasty, Rodrigo Abonia, Braulio Insuasty, Jairo Quiroga, Kenneth K Laali, Manuel Nogueras, Justo Cobo
An efficient, catalyst-free and one-pot three-component procedure for the synthesis of novel and nitrogen rich dihydropyrido[2,3-d]pyrimidines and dihydro-1H-pyrazolo[3,4-b]pyridines bearing a quinoline pharmacophore fragment is provided. Reactions proceeded in DMF under microwave irradiation of three-component mixtures of formyl-quinoline derivatives, primary heterocyclic amines and cyclic 1,3-diketones. Interestingly, when conventional heating at reflux was used for the starting 5-amino-1-phenylpyrazole, the corresponding aromatized pyrazolopyridines were obtained as the main products...
July 19, 2017: ACS Combinatorial Science
https://www.readbyqxmd.com/read/28722728/an-unprecedented-zn10o4-heteroadamantane-cage-containing-anilido-pyridinate-ligand-and-its-activity-for-ring-opening-polymerization-of-l-lactide-and-%C3%AE%C2%B5-caprolactone
#18
Ming-Tsz Chen, Chi-Tien Chen
(NPyC2OMe)8Zn10Et4(μ(4)-O)4 (1) has been synthesized in situ by hydrolysis of ZnEt2 in a one pot process and it was proved by applying X-ray structure analysis that the organozinc anilido-pyridinate moiety encapsulated the zinc oxide cluster, which demonstrated one self-assembled coordinate mode "Zn10O4". Moreover, the catalytic activity was investigated and good activity for l-lactide and ε-caprolactone ring opening polymerization was observed with both living and controllable properties.
July 19, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28722280/enantioselective-synthesis-of-acyclic-%C3%AE-quaternary-carboxylic-acid-derivatives-via-iridium-catalyzed-allylic-alkylation
#19
Samantha Shockley, John Caleb Hethcox, Brian Stoltz
The first highly enantioselective iridium-catalyzed allylic alkylation providing access to products bearing an allylic all-carbon quaternary stereogenic center has been developed. The reaction utilizes a masked acyl cyanide (MAC) reagent, which enables the one-pot preparation of α-quaternary carboxylic acids, esters, and amides with a high degree of enantioselectivity. The utility of these products is further explored via a series of diverse product transformations.
July 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28722265/control-of-redox-events-by-dye-encapsulation-applied-to-light-driven-splitting-of-hydrogen-sulfide
#20
Xu Jing, Yang Yang, Cheng He, Zhiduo Chang, Joost N H Reek, Chunying Duan
Inspired by the pocket feature of enzymes, a synthetic platform to combine photocatalytic hydrogen evolution with sulfide oxidation in a one-pot process via control over the location of electron transfer steps is reported in this paper. The redox-active coordination vessel Ni-TFT, which exhibits an octahedral pocket, encapsulates an organic dye to pre-organize for photocatalytic proton reduction via an oxidative quenching pathway using the nickel corners as catalysts, generating molecular hydrogen and the oxidized dye...
July 19, 2017: Angewandte Chemie
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