منابع مشابه
Habitat Specialization by Birds in Western Amazonian White-sand Forests
In the Peruvian Amazon, white-sand forests are patchily distributed and restricted to a few localities in the North. Although recent studies have documented patterns of habitat specialization by plants in these unique forests, very few studies of the fauna of these habitats have been conducted. The species composition of the avifauna of the white-sand forests at six localities in the region was...
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Parathyroid glands from laying hens were also xed in percent glutaraldehyde in phosphate buffer (0.1 M, 7.3 pH) for araldite embedding and used for electron microscopy. For routine histological observations, sections of 5 to 6 um thickness were cut and stained by, Mayer’s haemalum and eosin-phloxine, Masson’s trichrome, Crossman’s modi cation of Mallory’s triple stain, van Gieson’s method fo...
متن کاملAcne Keloidalis Nuchae in a White Woman
Acne keloidalis is a chronic inflammatory process that involves hair follicles of the nape of the neck and leads to hypertrophic scarring. In all references, it is noticed that this process occurs only in males after puberty and is especially seen in the black race. In this case, we report a 31-year-old white woman who had hypertrophic papules in the nape of her neck since 10 years ago and in p...
متن کاملDo birds differentiate between white noise and deterministic chaos?
Editor: W. Koenig Abstract Noisy, unpredictable sounds are often present in the vocalizations of fearful and stressed animals across many taxa. A variety of structural characteristics, called nonlinear acoustic phenomena, that include subharmonics, rapid frequency modulations, and deterministic chaos are responsible for the harsh sound quality of these vocalizations. Exposure to nonlinear sound...
متن کاملBirds in a Forest
The goal of this project is to use machine learning and computer vision techniques to identify an object in an image. More specifically, given an image of a bird, we would like to identify what species of bird it is. To do this, we have implemented a two step process; first identify the characteristics of the bird in the image, then use those characteristics to predict what species of bird it i...
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ژورنال
عنوان ژورنال: Nature
سال: 1878
ISSN: 0028-0836,1476-4687
DOI: 10.1038/018540e0