Results 131 to 140 of about 39,522 (160)
Compressibility and porosity modulate the mechanical properties of giant gas vesicles
Proceedings of the National Academy of Sciences of the United States of America, 2023 Gas vesicles used as contrast agents for noninvasive ultrasound imaging must be formulated to be stable, and their mechanical properties must be assessed. We report here the formation of perfluoro-n-butane microbubbles coated with surface-active proteins
Hedar H Al-Terke +2 more
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Gas‐Constructed Vesicles with Gas‐Moldable Membrane Architectures
Angewandte Chemie International Edition, 2019AbstractIntegrating gas as a main building block into nanomaterial construction is a challenging mission that remains elusive. Herein, we report a gas‐constructed vesicular system formed by CO2 gas and frustrated Lewis pairs (FLPs). Two molecular triads bearing three bulky borane and phosphine groups are designed as trivalent disc‐like FLP monomers ...
Miaomiao Xu, Liang Chen, Qiang Yan
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Morphological types of gas vesicles
Algological Studies/Archiv für Hydrobiologie, Supplement Volumes, 1996By electron-microscopic analysis of cells of 7 planktic species (four genera) of cyanobacteria living at sea water- and fresh water-surfaces, three distinct types of gas vesicles in their aerotopes could be distinguished. To minimize the error due to some variability of gas vesicle diameters at direct measurement, vesicles per 0.1 ľm2 of the ...
Jan Šmarda, David Šmajs
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Extremophiles, 2014
Gas vesicles consist predominantly of the hydrophobic GvpA and GvpC, and the accessory proteins GvpF through GvpM are required in minor amounts during formation. GvpM and its putative interaction partners were investigated. GvpM interacted with GvpH, GvpJ and GvpL, but not with GvpG.
Stella, Tavlaridou +2 more
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Gas vesicles consist predominantly of the hydrophobic GvpA and GvpC, and the accessory proteins GvpF through GvpM are required in minor amounts during formation. GvpM and its putative interaction partners were investigated. GvpM interacted with GvpH, GvpJ and GvpL, but not with GvpG.
Stella, Tavlaridou +2 more
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Structure of the wall of Halobacterium halobium gas vesicles
Journal of Molecular Biology, 1976The gas vesicles of Halobacterium halobium have been studied by recording X-ray diffraction patterns from both intact and collapsed vesicles. The wall is found to be remarkably thin; the average thickness is no more than 20 A. Electron microscopy indicates that the wall consists of ribs, and the X-ray data confirm this.
A E, Blaurock, W, Wober
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The Natural Selection of Gas Vesicles
1999Gas vesicles, which provide cyanobacteria and other prokaryotes with buoyancy, are hollow shells formed from protein. Although they have a simple structure which shows a basic uniformity in various groups of microorganisms, they exhibit some differences which can be explained by natural selection of smaller, stronger structures withstanding higher ...
Walsby, AE, Beard, SJ, Hayes, PK
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The elastic compressibility of gas vesicles
Proceedings of the Royal Society of London. Series B. Biological Sciences, 1982Abstract Theelastic compressibility of gas vesicles isolated from Anabaena flos-aquae has been measured with a specially constructed apparatus. The gas vesicle suspension was contained in a glass tube, closed at one end with a piston allowing volume adjustment and attached at the other end to a microcapillary, and was subjected to ...
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Acoustic characterization of nano gas vesicles
2015 IEEE International Ultrasonics Symposium (IUS), 2015Due to the lack of a proper contrast agent, the scope of molecular ultrasound imaging is restricted within blood vessels. Recently reported biogenic nano gas vesicle (NGV), 400nm by 100nm rod shape nano-bubbles encapsulated by a bilayer protein shell, may extend molecular ultrasound imaging capability and find substantial values in therapy.
null Yaoheng Yang +5 more
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Segregation Vesicles, Gas Filter-Pressing, and Igneous Differentiation
The Journal of Geology, 1984Some vesicles in certain subaerial flows of basalt and basaltic andesite are partially filled with dark, partly-glassy segregation material. The segregation material has about three times the concentration of K₂O, TiO₂, and P₂O₅ as the associated host rock.
A. T. ANDERSON +3 more
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Gas vesicles as collapsible MRI contrast agents
Nature Materials, 2018Microbial gas vesicles have been developed for use as MRI contrast agents whose contrast can be inactivated by applying ultrasound waves to collapse the vesicles.
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