排序方式: 共有26条查询结果,搜索用时 62 毫秒
1.
Jeremy D. Mirza Álvaro E. Migotto Ilia V. Yampolsky Gabriela V. de Moraes Aleksandra S. Tsarkova Anderson G. Oliveira 《Photochemistry and photobiology》2020,96(4):768-778
Chaetopterus variopedatus has been studied for over a century in terms of its physiology, ecology and life history. One focus of research is on its intrinsic bioluminescent emissions, which can be observed as a blue light emitted from the extremities of individual body segments, or as a secreted mucus. Even though research shows that C. variopedatus is a species complex miscategorized as a single species, all of the variants of this polychaete produce light, which has been investigated in terms of both physiology and biochemistry. Despite decades of study, there are still many questions about the luminescence reaction, and, as of yet, no clear function for light emission exists. This review summarizes the current knowledge on C. variopedatus luminescence in addition to briefly describing its morphology, life cycle and ecology. Possible functions for luminescence were discussed using observations of specimens found in Brazil, along with a comparison of previous studies of other luminescent organisms. Further study will provide a better understanding of how and why C. variopedatus produces luminescence, and purifying the protein and luciferin involved could lead to new bioanalytical applications, as this reaction is unique among all known luminescent systems. 相似文献
2.
O. G. Tsarkova 《Physics of Wave Phenomena》2007,15(1):12-45
A complex optical method for simultaneous determination of optical and thermal properties of solids (true temperature, reflectance,
transmittance, absorbance, extinction, specific heat capacity, thermal conductivity, and diffusivity) in a wide temperature
range (800–2700°C) was proposed and experimentally demonstrated. The developed setup is characterized by a high processing
rate (the time taken for measuring all parameters is from milliseconds to tens of seconds). It allows the study of rather
small samples (about several milligrams), which is a significant advantage as applied to new or expensive materials. New and
widely used materials (AlN, Al2O3, Si3N4, SiC, and Al2O3/SiC ceramics; C45, 16MnCrS5, 115CrV3, X5NiCr18 9, X12CrNi17 7, Sd, and Satellite 6 steels; E-Cu, CuSn, AlMgSi1, and AlCuMgPb
copper and aluminum alloys; as well as chemical vapor deposition (CVD) diamond films) were studied at heating rates of 103−104K·s−1 in various atmospheres (air and argon at pressures of 1 and 10−3 atm). This study demonstrated high efficiency and informativity of the proposed method. The data obtained can be used to
develop theoretical models describing the solid structure and properties at high temperatures in oxidizing, neutral, or regenerative
atmospheres. 相似文献
3.
Novel Mechanism of Bioluminescence: Oxidative Decarboxylation of a Moiety Adjacent to the Light Emitter of Fridericia Luciferin 下载免费PDF全文
Maxim A. Dubinnyi Zinaida M. Kaskova Natalja S. Rodionova Mikhail S. Baranov Andrey Yu. Gorokhovatsky Alexey Kotlobay Kyril M. Solntsev Aleksandra S. Tsarkova Valentin N. Petushkov Ilia V. Yampolsky 《Angewandte Chemie (International ed. in English)》2015,54(24):7065-7067
A novel luciferin from a bioluminescent Siberian earthworm Fridericia heliota was recently described. In this study, the Fridericia oxyluciferin was isolated and its structure elucidated. The results provide insight into a novel bioluminescence mechanism in nature. Oxidative decarboxylation of a lysine fragment of the luciferin supplies energy for light generation, while a fluorescent CompX moiety remains intact and serves as the light emitter. 相似文献
4.
Enzyme‐Compatible Dynamic Nanoreactors from Electrostatically Bridged Like‐Charged Surfactants and Polyelectrolytes 下载免费PDF全文
Isabell Hofmann Melanie König Dr. Carlos G. Lopez Dr. Ljubica Vojcic Prof. Dr. Walter Richtering Prof. Dr. Ulrich Schwaneberg Dr. Larisa A. Tsarkova 《Angewandte Chemie (International ed. in English)》2018,57(30):9402-9407
Reported is an unanticipated mechanism of attractive electrostatic interactions of fully neutralized polyacrylic acid (PAA) with like‐charged surfactants. Amphiphilic polymer‐surfactant complexes with high interfacial activity and a solubilization capacity exceeding that of conventional micelles are formed by bridging with Ca2+ ions. Incorporation of a protease into such dynamic nanoreactors results in a synergistically enhanced cleaning performance because of the improved solubilization of poorly water‐soluble immobilized proteins. Competitive interfacial and intermolecular interactions on different time‐ and length‐scales have been resolved using colorimetric analysis, dynamic tensiometry, light scattering, and molecular dynamic simulations. The discovered bridging association mechanism suggests reengineering of surfactant/polymer/enzyme formulations of modern detergents and opens new opportunities in advancing labile delivery systems. 相似文献
5.
Mikhail V. Dubovis Gennady F. Rudakov Alexander S. Kulagin Kseniya V. Tsarkova Sergey V. Popkov Alexander S. Goloveshkin Georgiy V. Cherkaev 《Tetrahedron》2018,74(6):672-683
Based on the deoxygenation reaction of 1-(1-tert-butyl-3-nitroazetidine-3-yl)-1H-1,2,3-triazoles a new method for the synthesis of substituted 1-(1H-imidazole-4-yl)-1H-1,2,3-triazoles has been developed. Fungicidal activity of these compounds has been investigated at a range of phytopathogenic fungi. 相似文献
6.
I.?S.?Zaitsev M.?S.?Tsarkova D.?O.?Solovyeva S.?Yu.?ZaitsevEmail author 《Moscow University Chemistry Bulletin》2018,73(6):307-311
The use of the achievements attained in colloid chemistry and other fields of chemical sciences allows us to develop new nanoscale systems for chemosensorics. Mixed monolayers consisting of a new chemosensory amphiphilic dithia-18-crown-6, which contains a dye of 4-alkylpyridine series with polyvinyl stearate at the water–air interface, are obtained and studied. The influence of various concentrations of silver ions on these mixed monolayers is studied. A promising method for the detection of silver ions in water using the given nanoscale systems based on chemosensory amphiphilic dithia-18-crown-6 is proposed. 相似文献
7.
Konstantin V. Purtov Valentin N. Petushkov Mikhail S. Baranov Konstantin S. Mineev Natalja S. Rodionova Zinaida M. Kaskova Aleksandra S. Tsarkova Alexei I. Petunin Vladimir S. Bondar Emma K. Rodicheva Svetlana E. Medvedeva Yuichi Oba Yumiko Oba Alexander S. Arseniev Sergey Lukyanov Josef I. Gitelson Ilia V. Yampolsky 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(28):8113-8113
8.
Tsarkova L Horvat A Krausch G Zvelindovsky AV Sevink GJ Magerle R 《Langmuir : the ACS journal of surfaces and colloids》2006,22(19):8089-8095
We study the details of the defect dynamics in thin films of a cylinder-forming polystyrene-block-polybutadiene (SB) diblock copolymer melt. The high temporal resolution of in-situ scanning force microscopy (SFM) uncovers elementary dynamic processes of structural rearrangements on time scales not accessible so far. Short-term interfacial undulations and the formation of transient phases (spheres, perforated lamellae, and lamellae) are observed. We demonstrate that the well-known structural defects are annihilated by short-term phase transitions into what may be considered excited states. These temporary phase transitions are reproduced in simulations based on dynamic self-consistent field theory. We discuss the role of the observed structural evolution in the context of the equilibrium phase behavior in SB thin films. 相似文献
9.
Cover Picture: The Chemical Basis of Fungal Bioluminescence (Angew. Chem. Int. Ed. 28/2015) 下载免费PDF全文
Dr. Konstantin V. Purtov Dr. Valentin N. Petushkov Dr. Mikhail S. Baranov Dr. Konstantin S. Mineev Dr. Natalja S. Rodionova Zinaida M. Kaskova Aleksandra S. Tsarkova Dr. Alexei I. Petunin Dr. Vladimir S. Bondar Dr. Emma K. Rodicheva Dr. Svetlana E. Medvedeva Prof. Yuichi Oba Yumiko Oba Prof. Alexander S. Arseniev Prof. Sergey Lukyanov Prof. Josef I. Gitelson Dr. Ilia V. Yampolsky 《Angewandte Chemie (International ed. in English)》2015,54(28):8001-8001
10.
Savina A. A. Garnashevich L. S. Zaitsev I. S. Tsarkova M. S. Zaitsev S. Yu. 《Moscow University Chemistry Bulletin》2019,74(6):306-309
Moscow University Chemistry Bulletin - Abstract—Both synthetic and natural polymers are promising carriers for the immobilization of enzymes, including lipases from different sources. This... 相似文献