منابع مشابه
Burial of redox-sensitive metals and organic matter in the equatorial Indian Ocean linked to precession
Authigenic metals (uranium, cadmium, and molybdenum), organic carbon (OC) and total C37 alkenone (totC37) concentrations were measured for the last 350 kyr in core MD900963, located in the eastern equatorial Arabian Sea. Authigenic metal concentrations on a carbonate-free basis range between 1 and 17 ppm, 0.5 and 6 ppm, and 0.5 and 4 ppm for U, Cd, and Mo, respectively. The profiles are charact...
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Many viruses have capsids that are icosahedra: 20-sided nearspheres with triangular faces. Chuan Zhang et al. have created icosahedra consisting purely of DNA, which self-assemble from five-pointed molecular tiles. The authors’ previous research with three-pointed tiles showed that triangular faces make extremely stable building blocks. In the present work, they designed fivepointed tiles using...
متن کاملRelics of Double Radio Sources
We have formed a new sample which consists of extended extragalactic radio sources without obvious active galactic nuclei (AGN) in them. Most of these sources appear to be dead double radio sources. These sources with steep spectra (α < -1.8; S ∝ ν) were identified using the 74 (VLSS) and the 1400 MHz (NVSS) surveys and further imaged using the Very Large Array (VLA) and the Giant Meterwave Rad...
متن کاملRadio Relics in Clusters of Galaxies
In this paper we review the observational results on Relic radio sources in clusters of galaxies. We discuss their observational properties, structures and radio spectra. We will show that Relics can be divided according to their size, morphology, and location in the galaxy cluster. These differences could be related to physical properties of Relic sources. The comparison with cluster condition...
متن کاملPoxvirus Viability and Signatures in Historical Relics
Although it has been >30 years since the eradication of smallpox, the unearthing of well-preserved tissue material in which the virus may reside has called into question the viability of variola virus decades or centuries after its original occurrence. Experimental data to address the long-term stability and viability of the virus are limited. There are several instances of well-preserved corps...
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ژورنال
عنوان ژورنال: The Annals of Iowa
سال: 1956
ISSN: 0003-4827,2473-9006
DOI: 10.17077/0003-4827.7426