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H Böhringer

Publications and source records attributed to H Böhringer.

7 recordsLinked to original sources
PubMed2000

Detection of an X-Ray Hot Region in the Virgo Cluster of Galaxies with ASCA.

Based on mapping observations with ASCA, an unusual hot region with a spatial extent of 1 deg2 was discovered between M87 and M49 at a center coordinate of R.A.=12h27m36s and decl.=9&j0;18' (J2000). The X-ray emission from the region has a 2-10 keV flux of 1x10-11 ergs s-1 cm-2 and a temperature of kT greater, similar4 keV, which is significantly higher than that in the surrounding medium of approximately 2 keV. The internal thermal energy in the hot region is estimated to be VnkT approximately 1060 ergs with a gas density of approximately 10-4 cm-3. A power-law spectrum with a photon index of 1.7-2.3 is also allowed by the data. The hot region suggests there is an energy input due to a shock that is probably caused by the motion of the gas associated with M49, infalling toward the M87 cluster with a velocity greater, similar1000 km s-1.

Journal Article↗
PubMed1991

[Significance of blood Ca(++) determination for assessment of the current status of calcium homeostasis].

Out of the blood calcium fractions know only the ionized calcium is biologically active. From the height of the total calcium level despite significant dependence no secure conclusion to the Ca++ concentration can be drawn. The level of the total calcium spreads further than that one of the ionized calcium. The up to now used mathematical approaches for the estimation of the blood Ca++ concentration also proved unsuitable; none of them provides a really better statement than the total calcium level. Thus even they represent no acceptable alternative to the Ca++ determination by means of ion-selective electrodes. The investigation by means of ion-selective electrodes. The investigation of various paraclinical sizes (total calcium, total protein, albumin, creatinine, alkaline phosphatase) in a group of patients and a control group in quality and quantity resulted in a different influence on the Ca++ level by the influential factors tested. Only by measurement of the ionized calcium the real actual condition of the calcium homoeostasis can be reflected. Therefore it is no more justified to draw diagnostically and therapeutically relevant consequences from the exclusive determination of the total calcium level.

Adult↗
PubMed1976

[Radiodensitometric studies on bone structure following tooth extractions].

Radiographs of the human mandible, accurately showing the same location, are made at different times after extraction of lateral teeth and examined with regard to changes in the bone structure during wound healing. The radiograms are evaluated by densography and the photometric graphs thus obtained are evaluated by computer. Compared with histological findings known so far, these examinations furnish information on time and location of resorption and production of bone after dental extractions. The first findings are quantitatively presented.

Bone Regeneration↗