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https://www.readbyqxmd.com/read/28646085/generation-of-a-collection-of-mutant-tomato-lines-using-pooled-crispr-libraries
#1
Thomas B Jacobs, Ning Zhang, Dhruv Patel, Gregory B Martin
The high efficiency of CRIPSR-mediated mutagenesis in plants enables the development of high-throughput mutagenesis strategies. By transforming pooled CRISPR libraries into tomato, collections of mutant lines were generated with minimal transformation attempts and in a relatively short period of time. Identification of the targeted gene(s) was easily determined by sequencing the incorporated gRNA(s) in the primary transgenic events. From a single transformation with a CRISPR library targeting the immunity-associated leucine-rich repeat subfamily XII genes, heritable mutations were recovered in 15 of the 54 genes targeted...
June 23, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28643777/in-situ-targeted-mri-detection-of-helicobacter-pylori-with-stable-magnetic-graphitic-nanocapsules
#2
Yunjie Li, Xiaoxiao Hu, Ding Ding, Yuxiu Zou, Yiting Xu, Xuewei Wang, Yin Zhang, Long Chen, Zhuo Chen, Weihong Tan
Helicobacter pylori infection is implicated in the aetiology of many diseases. Despite numerous studies, a painless, fast and direct method for the in situ detection of H. pylori remains a challenge, mainly due to the strong acidic/enzymatic environment of the gastric mucosa. Herein, we report the use of stable magnetic graphitic nanocapsules (MGNs), for in situ targeted magnetic resonance imaging (MRI) detection of H. pylori. Several layers of graphene as the shell effectively protect the magnetic core from corrosion while retaining the superior contrast effect for MRI in the gastric environment...
June 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28642622/self-assembled-cubic-boron-nitride-nanodots
#3
Alireza Khanaki, Zhongguang Xu, Hao Tian, Renjing Zheng, Zheng Zuo, Jian-Guo Zheng, Jianlin Liu
One of the low-dimensional Boron Nitride (BN) forms, namely, cubic-BN (c-BN) nanodots (NDs), offers a variety of novel opportunities in battery, biology, deep ultraviolet light emitting diodes, sensors, filters, and other optoelectronic applications. To date, the attempts towards producing c-BN NDs were mainly performed under extreme high-temperature/high-pressure conditions and resulted in c-BN NDs with micrometer sizes, mixture of different BN phases, and containing process-related impurities/contaminants...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642458/the-structure-and-hardness-of-the-highest-boride-of-tungsten-a-borophene-based-compound
#4
Nevill Gonzalez Szwacki
Two-dimensional systems have strengthened their position as a key materials for novel applications. Very recently, boron joined the distinguished group of elements confirmed to possess 2D allotropes, named borophenes. In this work, we explore the stability and hardness of the highest borides of tungsten, which are built of borophenes separated by metal atoms. We show that the WB3+x compounds have Vickers hardnesses approaching 40 GPa only for small values of x. The insertion of extra boron atoms is, in general, detrimental to the hardness of WB3 because it leads to the formation of quasi-planar boron sheets that are less tightly connected with the adjacent tungsten layers...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28642029/azobenzene-containing-photoswitchable-proteasome-inhibitors-with-selective-activity-and-cellular-toxicity
#5
Beatriz Blanco, Kathryn A Palasis, Alaknanda Adwal, David F Callen, Andrew D Abell
A series of azobenzene-containing peptidic boronate esters was prepared and the activity of the thermally adapted states (TAS), enriched in trans isomer, and the photostationary states (PSS), enriched in cis isomer, for each compound were evaluated against β5 and β1 proteasome subunits. Compounds with a sterically demanding phenyl-substituted azobenzene at P2 (4c), and a less sterically demanding unsubstituted azobenzene at the N-terminus (5a), showed the greatest difference in activity between the two states...
June 11, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28641944/effect-of-antimony-oxide-on-the-shielding-properties-of-some-sodium-boro-silicate-glasses
#6
A M Zoulfakar, A M Abdel-Ghany, T Z Abou-Elnasr, A G Mostafa, S M Salem, H H El-Bahnaswy
Some sodium-silicate-boro-antimonate glasses having the molecular composition [(20) Na2O - (20) SiO2 - (60-x) B2O3 - (x) Sb2O3 (where x takes the values 0, 5 … or 20)] have been prepared by the melt quenching method. The melting and annealing temperatures were 1500 and 650K respectively. The amorphous nature of the prepared samples was confirmed by using X-ray diffraction analysis. Both the experimental and empirical density and molar volume values showed gradual increase with increasing Sb2O3 content. The empirical densities showed higher values than those obtained experimentally, while the empirical molar volume values appeared lower than those obtained experimentally, which confirm the amorphous nature and randomness character of the studied samples...
June 19, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28641014/n-heterocyclic-carbene-boryl-iodides-catalyze-insertion-reactions-of-n-heterocyclic-carbene-boranes-and-diazoesters
#7
Thomas H Allen, Takuji Kawamoto, Sean Gardner, Steven J Geib, Dennis P Curran
Boron-hydrogen bond insertion reactions of N-heterocyclic carbene (NHC) boranes and diazoesters can be catalyzed by NHC-boryl iodides and produce stable α-NHC-boryl esters. The conditions of the reaction resemble the previous rhodium-catalyzed transformations (only the catalyst is different); however, the mechanisms of the two reactions are probably very different. The new boryl iodide catalyzed method is adept at producing α-substituted-α-NHC-boryl esters, and this has led to a family of NHC-boryl esters with amino acid and amino-acid-like side chains...
June 22, 2017: Organic Letters
https://www.readbyqxmd.com/read/28640994/promotion-of-electrocatalytic-hydrogen-evolution-reaction-on-nitrogen-doped-carbon-nanosheets-with-secondary-heteroatoms
#8
Konggang Qu, Yao Zheng, Xianxi Zhang, Ken Davey, Sheng Dai, Shi Zhang Qiao
Dual heteroatom-doped carbon materials are efficient electrocatalysts via a synergistic effect. With nitrogen as the primary dopant, boron, sulfur and phosphorus can be used as secondary elements for co-doped carbons. However, evaluation and analysis of the promotional effect of B, P and S to N-doped carbons has not been widely researched. Here we report a robust platform that is constructed through polydopamine (PDA) to prepare N, B-, N, P- and N, S-co-doped carbon nanosheets, characterized by similar N species content and efficient B, P and S doping...
June 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28640395/from-borane-to-borylene-without-reduction-ambiphilic-behavior-of-a-monovalent-silylisonitrile-boron-species
#9
Merle Arrowsmith, Dominic Auerhammer, Rüdiger Bertermann, Holger Braunschweig, Mehmet Ali Celik, Julian Erdmannsdörfer, Thomas Kupfer, Ivo Krummenacher
Deprotonation of [(cAAC)BH2(CN)] provided clean access to the stable boryl anion, [(cAAC)BH(CN)]-. Whereas the addition of soft electrophiles occurred at the nucleophilic boron center, harder silyl electrophiles added to the harder terminal cyano nitrogen. The resulting [(cAAC)BH(CNSiPh3)] species behaved both like a silylium boryl nucleophile and a neutral silylisonitrile borylene.
June 22, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28639621/electronic-metal-support-interaction-enhanced-oxygen-reduction-activity-and-stability-of-boron-carbide-supported-platinum
#10
Colleen Jackson, Graham T Smith, David W Inwood, Andrew S Leach, Penny S Whalley, Mauro Callisti, Tomas Polcar, Andrea E Russell, Pieter Levecque, Denis Kramer
Catalysing the reduction of oxygen in acidic media is a standing challenge. Although activity of platinum, the most active metal, can be substantially improved by alloying, alloy stability remains a concern. Here we report that platinum nanoparticles supported on graphite-rich boron carbide show a 50-100% increase in activity in acidic media and improved cycle stability compared to commercial carbon supported platinum nanoparticles. Transmission electron microscopy and x-ray absorption fine structure analysis confirm similar platinum nanoparticle shapes, sizes, lattice parameters, and cluster packing on both supports, while x-ray photoelectron and absorption spectroscopy demonstrate a change in electronic structure...
June 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28639613/mechanical-properties-of-atomically-thin-boron-nitride-and-the-role-of-interlayer-interactions
#11
Aleksey Falin, Qiran Cai, Elton J G Santos, Declan Scullion, Dong Qian, Rui Zhang, Zhi Yang, Shaoming Huang, Kenji Watanabe, Takashi Taniguchi, Matthew R Barnett, Ying Chen, Rodney S Ruoff, Lu Hua Li
Atomically thin boron nitride (BN) nanosheets are important two-dimensional nanomaterials with many unique properties distinct from those of graphene, but investigation into their mechanical properties remains incomplete. Here we report that high-quality single-crystalline mono- and few-layer BN nanosheets are one of the strongest electrically insulating materials. More intriguingly, few-layer BN shows mechanical behaviours quite different from those of few-layer graphene under indentation. In striking contrast to graphene, whose strength decreases by more than 30% when the number of layers increases from 1 to 8, the mechanical strength of BN nanosheets is not sensitive to increasing thickness...
June 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28639140/determination-of-the-thermal-and-epithermal-neutron-sensitivities-of-an-lbo-chamber
#12
Satoru Endo, Hitoshi Sato, Takuto Shimazaki, Erika Nakajima, Kei Kotani, Mitsuru Suda, Tsuyoshi Hamano, Tsuyoshi Kajimoto, Kenichi Tanaka, Masaharu Hoshi
An LBO (Li2B4O7) walled ionization chamber was designed to monitor the epithermal neutron fluence in boron neutron capture therapy clinical irradiation. The thermal and epithermal neutron sensitivities of the device were evaluated using accelerator neutrons from the (9)Be(d, n) reaction at a deuteron energy of 4 MeV (4 MeV d-Be neutrons). The response of the chamber in terms of the electric charge induced in the LBO chamber was compared with the thermal and epithermal neutron fluences measured using the gold-foil activation method...
June 21, 2017: Radiation and Environmental Biophysics
https://www.readbyqxmd.com/read/28639017/removal-of-polyvinylamine-sulfonate-anthrapyridone-dye-by-application-of-heterogeneous-electro-fenton-process
#13
Bakhta Bouzayani, Jessica Meijide, Marta Pazos, Sourour Chaâbane Elaoud, Maria Angeles Sanroman
Diversity and rapidly multiplication of the pollutants incite as to improve the conventional treatments wastewater methods. One of the bottlenecks often faced is the presence into wastewater of organic pollutants with complex structures that requests the design of efficient processes. Thus, this work investigates the removal of polyvinylamine sulfonate anthrapyridone (PSA) dye which complex structure makes difficult its degradation by conventional technologies. For that, a heterogeneous oxidative process using pyrite as sustainable catalyst was designed...
June 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28638083/multiple-thermal-spin-transport-performances-of-graphene-nanoribbon-heterojuction-co-doped-with-nitrogen-and-boron
#14
Hai Huang, Guoying Gao, Huahua Fu, Anmin Zheng, Fei Zou, Guangqian Ding, Kailun Yao
Graphene nanoribbon is a popular material in spintronics owing to its unique electronic properties. Here, we propose a novel spin caloritronics device based on zigzag graphene nanoribbon (ZGNR), which is a heterojunction consisting of a pure single-hydrogen-terminated ZGNR and one doped with nitrogen and boron. Using the density functional theory combined with the non-equilibrium Green's function, we investigate the thermal spin transport properties of the heterojunction under different magnetic configurations only by a temperature gradient without an external gate or bias voltage...
June 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28637710/the-combined-action-of-duplicated-boron-transporters-is-required-for-maize-growth-in-boron-deficient-conditions
#15
Mithu Chatterjee, Qiujie Liu, Caitlin Menello, Mary Galli, Andrea Gallavotti
The micronutrient boron is essential in maintaining the structure of plant cell walls and is critical for high yields in crop species. Boron can move into plants by diffusion or by active and facilitated transport mechanisms. We recently showed that mutations in the maize boron efflux transporter ROTTEN EAR (RTE) cause severe developmental defects and sterility. RTE is part of a small gene family containing five additional members (RTE2-RTE6) that show tissue specific expression. The close paralogous gene RTE2 encodes a protein with 95% amino acid identity with RTE and is similarly expressed in shoot and root cells surrounding the vasculature...
June 21, 2017: Genetics
https://www.readbyqxmd.com/read/28636396/copper-catalyzed-asymmetric-protoboration-of-%C3%AE-amidoacrylonitriles-and-%C3%AE-amidoacrylate-esters-an-efficient-approach-to-functionalized-chiral-%C3%AE-amino-boronate-esters
#16
Lili Chen, Xiaoliang Zou, Haonan Zhao, Senmiao Xu
A copper-catalyzed asymmetric protoboration of both Z-β-amidoacrylonitriles and ethyl E-β-amidoacrylates using bis(pinacolato)diboron has been developed for the first time. The process tolerates a vast array of substrates, delivering a series of stable functionalized chiral α-amino boronate esters in good yields and enantioselectivities under mild reaction conditions. The current method is also applicable for gram-scale synthesis without erosion of enantioselectivity. This work provides an attractive and complementary approach to synthesizing enantioriched chiral α-amino boronate esters...
June 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28635618/nickel-cobaltite-nanosheets-strongly-anchored-on-boron-and-nitrogen-co-doped-graphene-for-high-performance-asymmetric-supercapacitors
#17
Xinyan Jiao, Xifeng Xia, Peng Liu, Wu Lei, Yu Ouyang, Qingli Hao
Strongly coupled boron and nitrogen co-doped graphene (BN-G) hybrids with nickel cobaltite (NiCo2O4) nanosheets (NCO/BN-G) were fabricated by a facile soft-chemical method for asymmetric supercapacitors with high-performance. The strong interaction between BN-G and NiCo2O4 nanosheets are explored by various techniques. The effect of heteroatom doping on electrochemical properties of the hybrids is systematically investigated. The strong synergistic effect between NiCo2O4 and BN-G leads to a specific capacitance of 106...
June 21, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28634608/hexagonal-boron-nitride-supported-mesosio2-confined-ni-catalysts-for-dry-reforming-of-methane
#18
Yang Cao, Meirong Lu, Jianhui Fang, Liyi Shi, Dengsong Zhang
Based on the superior chemical and thermal stability of hexagonal boron nitride (h-BN), we design and synthesize h-BN supported mesoSiO2-confined Ni catalysts with a stable architecture. The as-prepared catalyst exhibits excellent coke- and sintering-resistance performance in the dry reforming of methane, and especially, there is almost no loss of activity even after a 100 h stability test due to the synergistic effects of the h-BN interface and Ni nanoparticles.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634039/synthesis-and-biological-activity-of-peptide-proline-boronic-acids-as-proteasome-inhibitors
#19
Liqiang Han, Yanzhao Wen, Ridong Li, Bo Xu, Zemei Ge, Xin Wang, Tieming Cheng, Jingrong Cui, Runtao Li
On the basis of the application of proline-boronic acid as pharmacophore in the kinase inhibitors and our previous research results, using proline-boronic acid as warhead, two series of peptide proline-boronic acids, dipeptide proline-boronic acids (I) and tripeptide proline-boronic acids (II), were designed and synthesized. All the synthesized compounds were first evaluated for their biological activity against MGC803 cell, and then, the best compound II-7 was selected to test its anti-tumor spectrum on six human tumor cell lines and proteasome inhibition against three subunits...
June 9, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28633860/influencing-factors-and-kinetics-analysis-on-the-leaching-of-iron-from-boron-carbide-waste-scrap-with-ultrasound-assisted-method
#20
REVIEW
Xin Li, Pengfei Xing, Xinghong Du, Shuaibo Gao, Chen Chen
In this paper, the ultrasound-assisted leaching of iron from boron carbide waste-scrap was investigated and the optimization of different influencing factors had also been performed. The factors investigated were acid concentration, liquid-solid ratio, leaching temperature, ultrasonic power and frequency. The leaching of iron with conventional method at various temperatures was also performed. The results show the maximum iron leaching ratios are 87.4%, 94.5% for 80min-leaching with conventional method and 50min-leaching with ultrasound assistance, respectively...
September 2017: Ultrasonics Sonochemistry
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