منابع مشابه
Within-field spatial distribution of Cephus cinctus (Hymenoptera: Cephidae) larvae in Montana wheat fields
Montana State University, Department of Entomology, 333 Leon Johnson Hall, P.O. Box 173020, Bozeman, Montana 59717, United States of America Nansen et al. 214 Abstract—The wheat stem sawfly, Cephus cinctus Norton, is a major insect pest in dryland wheat (Triticum L. spp.; Poaceae) fields in the northern Great Plains of the United States and in southern regions of the prairie provinces of Canada...
متن کاملUnderground Coal Mining: Relationship between Coal Dust Levels and Pneumoconiosis, in Two Regions of Colombia, 2014
In Colombia, coal miner pneumoconiosis is considered a public health problem due to its irreversibility, high cost on diagnosis, and lack of data related to its prevalence in the country. Therefore, a cross-sectional study was carried out in order to determine the prevalence of pneumoconiosis in underground coal mining workers in two regions of Colombia. The results showed a 35.9% prevalence of...
متن کاملTobacco Root Mountains, Montana
Meta-ultramafi c rocks occur as small (2 to 100 m long), podiform bodies in all three major Precambrian rock suites of the Tobacco Root Mountains of southwest Montana. Most samples consist of a randomly oriented, coarse-grained assemblage of orthopyroxene, olivine, and magnesiohornblende ± spinel, partially replaced by a fi ne-grained assemblage that may include anthophyllite, talc, cummingtoni...
متن کاملDeadly radon in montana?
Noting a negative correlation between average radon levels and lung cancer mortality in Montana counties, Hart (2011) “questions the notion that radon is deadly in Montana.” Results from a much larger ecological study of the correlation between county radon levels and lung cancer mortality across the whole United States were published in the 1990s (Cohen 1990, 1995). Like Hart, Cohen found an i...
متن کاملTwo remarks on differential fields
We make two observations concerning differential fields. The first is a model-theoretic proof of the existence and uniqueness of a PicardVessiot extension for an iterative linear differential equation (in positive characteristic) answering a question of Hrushovski. The second observation is that definable sets of finite Morley rank in differentially closed fields of characteristic zero are (pos...
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ژورنال
عنوان ژورنال: Geological Society of America Bulletin
سال: 1892
ISSN: 0016-7606,1943-2674
DOI: 10.1130/gsab-3-301