We present 14 simultaneous Chandra X-ray Observatory (CXO)-Hubble Space Telescope (HST) observations of Jupiter's Northern X-ray and ultraviolet (UV) aurorae from 2016 to 2019. Despite the variety of dynamic UV and X-ray auroral structures, one region is conspicuous by its persistent absence of emission: the dark polar region (DPR). Previous HST observations have shown that very little UV emission is produced by the DPR. We find that the DPR also produces very few X-ray photons. For all 14 observations, the low level of X-ray emission from the DPR is consistent (within 2-standard deviations) with scattered solar emission and/or photons spread by Chandra's Point Spread Function from known X-ray-bright regions. We therefore conclude that for these 14 observations the DPR produced no statistically significant detectable X-ray signature.
Colonic Neoplasms/diagnosis , Colonic Polyps/diagnosis , Adult , Age Factors , Aged , Barium Sulfate , Colonic Diseases/diagnostic imaging , Colonic Neoplasms/diagnostic imaging , Colonic Neoplasms/genetics , Colonic Polyps/diagnostic imaging , Colonic Polyps/genetics , Colonoscopy , Diet , Enema , Female , Humans , Radiography , Risk , Sigmoidoscopy , Syndrome
The great number of disciplines involving oncology and the exponential growth in the number of publications make it increasingly more difficult to keep abreast of the important oncological literature appearing in a large number of periodicals. It is, therefore, essential for the oncologist to be up to date with the journals and to read the papers relevant to his specialty. The cancer literature information system SABIR-C developed by the French and German Cancer Research Centers was created for this purpose. The present paper analyses 54496 papers published in periodicals covered by the SABIR-C system in the period from January 1969 to October 1974. The tables included contain the titles of periodicals which are of particular relevance for cancer research. They permit a quick orientation with regard to the important sources of oncological publications. These tables also assist the librarian working in a cancer research institution in selecting the most important and quantitatively most productive periodicals. This is especially important since he usually has only limited financial resources at his disposal. Further tables give a survey of the countries of origin and the categories to which the latest oncological literature belongs.
Documentation , Neoplasms , Periodicals as Topic , Evaluation Studies as Topic , Information Systems
