Готові списки джерел за темами / Molecular open-shells

Добірка наукової літератури з теми "Molecular open-shells"

Автор: Grafiati

Опубліковано: 14 березня 2023

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Статті в журналах з теми "Molecular open-shells"

Gottlieb, Alex D., John D. Head, and Dennis Perusse. "Natural molecular shells as open subsystems of small molecules." International Journal of Quantum Chemistry 111, no. 15 (January 19, 2011): 4158–73. http://dx.doi.org/10.1002/qua.22980.

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Rudzikas, Z. B. "Many-Body Problems. Atomic Configurations with Several Open Shells." Physica Scripta 35, no. 5 (May 1, 1987): 628–32. http://dx.doi.org/10.1088/0031-8949/35/5/003.

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Fromherz, Peter, and Diether Ruppel. "Lipid vesicle formation: the transition from open disks to closed shells." FEBS Letters 179, no. 1 (January 1, 1985): 155–59. http://dx.doi.org/10.1016/0014-5793(85)80211-8.

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Bartsch, M., H. Geesmann, G. F. Hanne, and J. Kessler. "Asymmetric scattering of polarized electrons from atoms with closed and open shells." Journal of Physics B: Atomic, Molecular and Optical Physics 25, no. 7 (April 14, 1992): 1511–26. http://dx.doi.org/10.1088/0953-4075/25/7/021.

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Nekhoroshkov, Pavel, Inga Zinicovscaia, Dmitry Nikolayev, Tatiana Lychagina, Alexey Pakhnevich, Nikita Yushin, and Jacques Bezuidenhout. "Effect of the Elemental Content of Shells of the Bivalve Mollusks (Mytilus galloprovincialis) from Saldanha Bay (South Africa) on Their Crystallographic Texture." Biology 10, no. 11 (October 25, 2021): 1093. http://dx.doi.org/10.3390/biology10111093.

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A both wild and farmed mussels in natural conditions, anthropogenic inputs are usually reflected in the increase of the content of specific elements. To determine the possible effect of the elemental patterns of farmed and wild mussels (Mytilus galloprovincialis) collected in the Saldanha Bay area (South Africa) on the crystallographic texture of the shells, the content of 20 elements in shells and 24 in the soft tissue of mussels was determined by neutron activation analysis. The crystallographic texture of mussel shells was analyzed using time-of-flight neutron diffraction. The wild mussels from open ocean site live in stressful natural conditions and contain higher amounts of the majority of determined elements in comparison with mussels farmed in closed water areas with anthropogenic loadings. The changes between the maximums of the same pole figures of the three samples are in the range of variability identified for the genus Mytilus. The content of Cl, Sr, and I was the highest in mussels from the open ocean site, which is reflected by the lowest mass/length ratio. The determined crystallographic textures of mussels are relatively stable as shown in the analyzed pole figures despite the concentrations of Na, Mg, Cl, Br, Sr, and I in shells, which significantly differ for wild and farmed mussels. The stability of the crystallographic texture that we observed suggests that it can be used as a reference model, where if a very different texture is determined, increased attention to the ecological situation should be paid.

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Argenziano, Rita, Federica Moccia, Rodolfo Esposito, Gerardino D’Errico, Lucia Panzella, and Alessandra Napolitano. "Recovery of Lignins with Potent Antioxidant Properties from Shells of Edible Nuts by a Green Ball Milling/Deep Eutectic Solvent (DES)-Based Protocol." Antioxidants 11, no. 10 (September 21, 2022): 1860. http://dx.doi.org/10.3390/antiox11101860.

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Lignins are phenolic polymers endowed with potent antioxidant properties that are finding increasing applications in a variety of fields. Consequently, there is a growing need for easily available and sustainable sources, as well as for green extraction methodologies of these compounds. Herein, a ball milling/deep eutectic solvent (DES)-based treatment is reported as an efficient strategy for the recovery of antioxidant lignins from the shells of edible nuts, namely chestnuts, hazelnuts, peanuts, pecan nuts, and pistachios. In particular, preliminarily ball-milled shells were treated with 1:2 mol/mol choline chloride:lactic acid at 120 °C for 24 h, and the extracted material was recovered in 19–27% w/w yields after precipitation by the addition of 0.01 M HCl. Extensive spectroscopic and chromatographic analysis allowed for confirmation that the main phenolic constituents present in the shell extracts were lignins, accompanied by small amounts (0.9% w/w) of ellagic acid, in the case of chestnut shells. The recovered samples exhibited very promising antioxidant properties, particularly in the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay (EC50 values ranging from 0.03 to 0.19 mg/mL). These results open new perspectives for the valorization of nut shells as green sources of lignins for applications as antioxidants, e.g., in the biomedical, food, and/or cosmetic sector.

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Martins, Michael, Kai Godehusen, Tobias Richter, Philippe Wernet, and Peter Zimmermann. "Open shells and multi-electron interactions: core level photoionization of the 3d metal atoms." Journal of Physics B: Atomic, Molecular and Optical Physics 39, no. 5 (February 6, 2006): R79—R125. http://dx.doi.org/10.1088/0953-4075/39/5/r01.

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Tomašových, Adam, and Susan M. Kidwell. "Nineteenth-century collapse of a benthic marine ecosystem on the open continental shelf." Proceedings of the Royal Society B: Biological Sciences 284, no. 1856 (June 7, 2017): 20170328. http://dx.doi.org/10.1098/rspb.2017.0328.

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The soft-sediment seafloor of the open continental shelf is among the least-known biomes on Earth, despite its high diversity and importance to fisheries and biogeochemical cycling. Abundant dead shells of epifaunal suspension-feeding terebratulid brachiopods ( Laqueus ) and scallops on the now-muddy mainland continental shelf of southern California reveal the recent, previously unsuspected extirpation of an extensive offshore shell-gravel ecosystem, evidently driven by anthropogenic siltation. Living populations of attached epifauna, which formerly existed in a middle- and outer-shelf mosaic with patches of trophically diverse muds, are restricted today to rocky seafloor along the shelf edge and to the sandier shelves of offshore islands. Geological age-dating of 190 dead brachiopod shells shows that (i) no shells have been produced on the mainland shelf within the last 100 years, (ii) their shell production declined steeply during the nineteenth century, and (iii) they had formerly been present continuously for at least 4 kyr. This loss, sufficiently rapid (less than or equal to 100 years) and thorough to represent an ecosystem collapse, coincides with intensification of alluvial-plain land use in the nineteenth century, particularly livestock grazing. Extirpation was complete by the start of twentieth-century urbanization, warming, bottom fishing and scientific surveys. The loss of this filter-feeding fauna and the new spatial homogeneity and dominance of deposit- and detritus-feeders would have altered ecosystem functioning by reducing habitat heterogeneity and seawater filtering. This discovery, attesting to the power of this geological approach to recent ecological transitions, also strongly increases the spatial scope attributable to the negative effects of siltation, and suggests that it has been under-recognized on continental shelves elsewhere as a legacy of coastal land use.

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Plakhutin, B. N., A. V. Arbuznikov, and A. B. Trofimov. "Coupling coefficients for systems with two open electronic shells: Transition metal ions with pM dN configuration." International Journal of Quantum Chemistry 45, no. 4 (1993): 363–83. http://dx.doi.org/10.1002/qua.560450404.

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Graniero, Lauren E., Ethan L. Grossman, and Aaron O’Dea. "Stable isotopes in bivalves as indicators of nutrient source in coastal waters in the Bocas del Toro Archipelago, Panama." PeerJ 4 (August 2, 2016): e2278. http://dx.doi.org/10.7717/peerj.2278.

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To examine N-isotope ratios (15N/14N) in tissues and shell organic matrix of bivalves as a proxy for natural and anthropogenic nutrient fluxes in coastal environments,Pinctada imbricata,Isognomon alatus, andBrachidontes exustusbivalves were live-collected and analyzed from eight sites in Bocas del Toro, Panama. Sites represent a variety of coastal environments, including more urbanized, uninhabited, riverine, and oceanic sites. Growth under differing environmental conditions is confirmed byδ18O values, with open ocean Escudo de Veraguas shells yielding the highest averageδ18O (−1.0‰) value and freshwater endmember Rio Guarumo the lowest (−1.7‰). At all sites there is no single dominant source of organic matter contributing to bivalveδ15N andδ13C values. Bivalveδ15N andδ13C values likely represent a mixture of mangrove and seagrass N and C, although terrestrial sources cannot be ruled out. Despite hydrographic differences between end-members, we see minimalδ15N andδ13C difference between bivalves from the river-influenced Rio Guarumo site and those from the oceanic Escudo de Veraguas site, with no evidence for N from open-ocean phytoplankton in the latter. Populated sites yield relative15N enrichments suggestive of anthropogenic nutrient input, but lowδ15N values overall make this interpretation equivocal. Lastly,δ15N values of tissue and shell organic matrix correlate significantly for pterioideansP. imbricataandI. alatus. Thus for these species, N isotope studies of historical and fossil shells should provide records of ecology of past environments.

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Більше джерел

Книги з теми "Molecular open-shells"

Dworkin, Craig. Helicography. punctum books, 2021. http://dx.doi.org/10.53288/0352.1.00.

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Part art history essay, part experimental fiction, part theoretical manifesto on the politics of equivalence, Helicography examines questions of scale in relation to Robert Smithson’s iconic 1970 artwork Spiral Jetty. In an essay and film made to accompany the earthwork, Smithson invites us to imagine the stone helix of his structure at various orders of magnitude, from microscopic molecules to entire galaxies. Taking up this invitation with an unrelenting and literal enthusiasm, Helicography pursues the implications of such transformations all the way to the limits of logic. If other spirals, from the natural to the man-made, were expanded or condensed to the size of Spiral Jetty, what are the consequences of their physical metamorphoses? What other equivalences follow in turn, and where do their surprising historical, cultural, and mechanical connections lead? This book considers a number of forms in order to find out: the fluid vortices of whirlpools, hurricanes, and galaxies; the delicate shells of snails and the threatening pose of rattlesnakes; prehistoric ferns and the turns of the inner ear; the monstrous jaws of ancient sharks; a baroque finial scroll on a bass viol; a 19th-century watch spring; phonograph discs and spooled film; the largest open-pit mine on the planet. The result is a narrative laboratory for the “science of imaginary solutions” proposed by Alfred Jarry (whose King Ubu also plays a central role in the story told here), a work of fictocriticism blurring form and content, and the story of a single instant in time lost in the deserts of the intermountain west.

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