منابع مشابه
A Straight and Narrow Ionized Filament
We report the discovery of a extremely narrow, extremely linear, ionized filament. The filament is ∼ 2.5◦ long and has an Hα surface brightness of ∼0.5 rayleighs. It is at high galactic latitude, stretching from (l, b) = (140.8◦, 39.0◦) to (138.0◦, 37.7◦). The filament is approximately “Y” shaped. The vertical segment of the “Y” is ∼ 1.2◦ long and ∼ 20′′ wide, and the widest separation of the t...
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Collagen may be reprecipitated as obliquely striated fibrils. The oblique striations are due to D-periodic subfibrils staggered axially by approxi mately 9.0 nm with respect to their neighbours (Bruns, Trelstad & Gross 1973). The diameter of the subfibrils is variable. Optical diffraction analysis of the electron micrographs reveals instances of subfibrils with the D-repeat having diameter 3.7...
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Neurons in visual cortex are selective for the orientation of a visual stimulus, while the receptive fields of their thalamic input are circular. Cortical orientation selectivity arises from the organization of both thalamic input and local cortical circuits. In this issue of Neuron, Schummers and colleagues provide evidence that the local circuit mechanisms contributing to orientation selectiv...
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Oscillations and propagating waves are commonly seen in high-resolution observations of filament threads, i.e., the fine-structures of solar filaments/prominences. Since the temperature of prominences is typically of the order of 104 K, the prominence plasma is only partially ionized. In this paper, we study the effect of neutrals on the wave propagation in a filament thread modeled as a partia...
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The past decade has seen a tremendous increase in the number of men treated for hypogonadism with the expectation of symptomatic benefit. However, the long-term cardiovascular safety of testosterone replacement remains unknown because retrospective studies of testosterone replacement have been inconsistent, and definitive, prospective, randomized studies are lacking. The purpose of this review ...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2001
ISSN: 0004-6256
DOI: 10.1086/322097