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21.
Dr. David A. Rusling Arun Richard Chandrasekaran Dr. Yoel P. Ohayon Prof. Dr. Tom Brown Prof. Dr. Keith R. Fox Dr. Ruojie Sha Prof. Dr. Chengde Mao Prof. Dr. Nadrian C. Seeman 《Angewandte Chemie (International ed. in English)》2014,53(15):3979-3982
DNA is a very useful molecule for the programmed self‐assembly of 2D and 3D nanoscale objects. 1 The design of these structures exploits Watson–Crick hybridization and strand exchange to stitch linear duplexes into finite assemblies. 2 – 4 The dimensions of these complexes can be increased by over five orders of magnitude through self‐assembly of cohesive single‐stranded segments (sticky ends). 5 , 6 Methods that exploit the sequence addressability of DNA nanostructures will enable the programmable positioning of components in 2D and 3D space, offering applications such as the organization of nanoelectronics, 7 the direction of biological cascades, 8 and the structure determination of periodically positioned molecules by X‐ray diffraction. 9 To this end we present a macroscopic 3D crystal based on the 3‐fold rotationally symmetric tensegrity triangle 3 , 6 that can be functionalized by a triplex‐forming oligonucleotide on each of its helical edges. 相似文献
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Brandon Lu Karol Woloszyn Yoel P. Ohayon Bena Yang Cuizheng Zhang Chengde Mao Nadrian C. Seeman Simon Vecchioni Ruojie Sha 《Angewandte Chemie (International ed. in English)》2023,62(6):e202213451
Non-canonical interactions in DNA remain under-explored in DNA nanotechnology. Recently, many structures with non-canonical motifs have been discovered, notably a hexagonal arrangement of typically rhombohedral DNA tensegrity triangles that forms through non-canonical sticky end interactions. Here, we find a series of mechanisms to program a hexagonal arrangement using: the sticky end sequence; triangle edge torsional stress; and crystallization condition. We showcase cross-talking between Watson–Crick and non-canonical sticky ends in which the ratio between the two dictates segregation by crystal forms or combination into composite crystals. Finally, we develop a method for reconfiguring the long-range geometry of formed crystals from rhombohedral to hexagonal and vice versa. These data demonstrate fine control over non-canonical motifs and their topological self-assembly. This will vastly increase the programmability, functionality, and versatility of rationally designed DNA constructs. 相似文献
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Three novel compounds, designated kitungolides A (1), B (2), and C (3), were isolated from a soft coral of a new genus collected at Kitungamwe, Kenya. The three new compounds are of a unique heterotricyclic skeleton. The structures and relative stereochemistry of the compounds were elucidated by interpretation of MS, COSY, HMQC, HMBC, and NOESY experiments. [structure: see text] 相似文献
26.
Yoel Tsur Yitzchak L. Freilich Moshe Levy 《Journal of polymer science. Part A, Polymer chemistry》1974,12(7):1531-1539
The degradation of a series of polybenzimidazoles containing metylene groups in the chain was studied by TGA and MS. On heating the polymer derived from m-phenylenediacetic acid and 3,3′-diaminobenzidine to about 560°C in argon, partial fast decomposition into a solid sublimate was observed. The sublimate consisted of a mixture of fractions derived from the breaking of the chain at the methylene bonds. These methylene groups can be preoxidized at 250°C to carbonyl groups, eliminating thereby this mode of decomposition. At temperature higher than 560°C, gaseous products similar to those of the corresponding all-aromatic PBI are obtained. 相似文献
27.
[structure: see text] A novel cyclic peptide, callynormine A, was isolated from the Kenyan marine sponge Callyspongia abnormis and its structure elucidated by interpretation of its NMR data and X-ray diffraction analysis. Callynormine A represents a new class of heterodetic cyclic peptides (designated endiamino peptides) possessing an alpha-amido-beta-aminoacrylamide cyclization functionality. 相似文献
28.
Yoel Tikochinsky 《International Journal of Theoretical Physics》1988,27(5):543-549
Starting with very simple assumptions, Feynman rules for the quantum mechanical amplitudes and the associated probabilities are derived. These rules emerge as the only consistent rules for manipulating complex amplitudes assigned to processes. The probability of a process to which an amplitudex has been assigned is determined asp(x)=|x|
, 0<2. If virtual processes are allowed,=2. 相似文献
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Hagit Sorek Sophie Gueta Maria Jesus Martin Emile Gaydou Yoel Kashman 《Tetrahedron》2006,62(37):8838-8843
In our continuing program to identify bioactive compounds from marine invertebrates, the MeOH/EtOAc (1:1) extract of three collections of the Madagascar sponge, Biemna laboutei, was found to be cytotoxic to a series of human tumor cells. From the two sponges, seven new guanidine alkaloids, designated netamines A-G (1-7), have been isolated and their structures elucidated. Compounds 3 and 4 were found to be cytotoxic against three tumor cells with GI50 values in the micromolar range. 相似文献