Results 11 to 20 of about 87,892 (246)
A 21 000-year record of fluorescent organic matter markers in the WAIS Divide ice core [PDF]
Climate of the Past, 2017 Englacial ice contains a significant reservoir of organic material (OM), preserving a chronological record of materials from Earth's past. Here, we investigate if OM composition surveys in ice core research can provide paleoecological information on the ...
J. D'Andrilli +4 more
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Ecotoxicology and Environmental Safety, 2021 The transformation between hexavalent chromium (Cr6+) and trivalent chromium (Cr3+) has a significant impact on ecosystems, as Cr6+ has higher levels of toxicity than Cr3+.
Quoc Anh Nguyen +5 more
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Proton Ordering of Cubic Ice Ic: Spectroscopy and Computer Simulations
The Journal of Physical Chemistry C, 2014 Several proton-disordered crystalline ice structures are known to proton order at sufficiently low temperatures, provided that the right preparation procedure is used. For cubic ice, ice Ic, however, no proton ordering has been observed so far. Here, we subject ice Ic to an experimental protocol similar to that used to proton order hexagonal ice.
Geiger P +7 more
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VLT Spectroscopy of Blue Supergiants in IC 1613 [PDF]
The Astrophysical Journal, 2007 We present multi-object spectroscopy of young, massive stars in the Local Group galaxy IC 1613. We provide the spectral classification and a detailed spectral catalog for 54 OBA stars in this galaxy. The majority of the photometrically selected sample is composed of B- and A-type supergiants. The remaining stars include early O-type dwarfs and the only
Bresolin, Fabio +4 more
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Distinguishing ice β-XV from deep glassy ice VI: Raman spectroscopy
Physical Chemistry Chemical Physics, 2019 Evidence for the existence of D2O-ice β-XV is given by the observation of its librational Raman band at 380 cm−1.
Alexander V. Thoeny +2 more
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Brief Communication: Ikaite (CaCO3·6H2O) discovered in Arctic sea ice [PDF]
The Cryosphere, 2010 We report for the first time on the discovery of calcium carbonate crystals as ikaite (CaCO3·6H2O) in sea ice from the Arctic (Kongsfjorden, Svalbard) as confirmed by morphology and indirectly by X-ray diffraction as well as XANES spectroscopy of ...
M. A. Granskog +6 more
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Two-dimensional infrared spectroscopy of neat ice Ih [PDF]
Physical Chemistry Chemical Physics, 2012 The OH stretch line shape of ice Ih exhibits distinct peaks, the assignment of which remains controversial. We address this longstanding question using two dimensional infrared (2D IR) spectroscopy of the OH stretch of H(2)O and the OD stretch of D(2)O of ice Ih at T = 80 K.
Perakis, Fivos, Hamm, Peter
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Vacuum-UV spectroscopy of interstellar ice analogs [PDF]
Astronomy & Astrophysics, 2014 Dust grains in cold circumstellar regions and dark-cloud interiors at 10-20 K are covered by ice mantles. A nonthermal desorption mechanism is invoked to explain the presence of gas-phase molecules in these environments, such as the photodesorption induced by irradiation of ice due to secondary ultraviolet photons.
Cruz-Diaz, G. A. +3 more
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Ice Nucleation Properties of Ice-binding Proteins from Snow Fleas
Biomolecules, 2019 Ice-binding proteins (IBPs) are found in many organisms, such as fish and hexapods, plants, and bacteria that need to cope with low temperatures. Ice nucleation and thermal hysteresis are two attributes of IBPs.
Akalabya Bissoyi +6 more
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Depositional ice nucleation on solid ammonium sulfate and glutaric acid particles [PDF]
Atmospheric Chemistry and Physics, 2010 Heterogeneous ice nucleation on solid ammonium sulfate and glutaric acid particles was studied using optical microscopy and Raman spectroscopy. Optical microscopy was used to detect selective nucleation events as water vapor was slowly introduced into an
K. J. Baustian +2 more
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