منابع مشابه
The Red Halo Phenomenon
Optical and near-IR observations of the halos of disk galaxies and blue compact galaxies have revealed a very red spectral energy distribution which cannot easily be reconciled with a normal, metal-poor stellar population like that in the stellar halo of the Milky Way. Here, spectral evolutionary models are used to explore the consequences of these observations. We demonstrate that a stellar po...
متن کاملSpontaneous Involution of Congenital Melanocytic Nevus With Halo Phenomenon
Congenital melanocytic nevus (CMN) is a neural crest-derived hamartoma, which appear at or soon after birth. CMN has a dynamic course and may show variable changes over time, including spontaneous involution. Spontaneous involution of CMN is a rare phenomenon and is often reported in association with halo phenomenon or vitiligo. The mechanism of halo phenomenon is yet to be investigated but is ...
متن کاملHalo phenomenon with regression of acquired melanocytic nevi: a case report.
We report a case of halo-phenomenon in excisional biopsy of junctional nevi in a 19-year-old girl. The diagnosis was established histopathologically because of the lack of clinical halo and unspecific dermoscopic features. Clinicopathologic difficulties in establishing the diagnosis of these pigmented lesions, etiopathogenesis and differential diagnosis of halo nevi are emphasized. Dermatologis...
متن کاملRisk Factors Associated with the Halo Phenomenon after Lumbar Fusion Surgery and its Clinical Significance
STUDY DESIGN Retrospective study. PURPOSE First, to examine the association between bone mineral density (BMD) and the halo phenomenon, and second, to investigate risk factors predisposing to the halo phenomenon and its correlation with clinical outcomes. OVERVIEW OF LITERATURE The few in vivo studies regarding the relationship between pedicle screw stability and BMD have shown conflicting ...
متن کاملPhysical Modeling and Characterization of the Halo Phenomenon in Night Vision Goggles
When a bright light source is viewed through Night Vision Goggles (NVG), the image of the source can appear enveloped in a “halo” that is much larger than the “weak-signal” point spread function of the NVG. The halo phenomenon was investigated in order to produce an accurate model of NVG performance for use in psychophysical experiments. Halos were created and measured under controlled laborato...
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ژورنال
عنوان ژورنال: Nature
سال: 1944
ISSN: 0028-0836,1476-4687
DOI: 10.1038/154240b0