Jupiter's X-Ray and UV Dark Polar Region.

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.

Comparing Jupiter's Equatorial X-Ray Emissions With Solar X-Ray Flux Over 19 Years of the Chandra Mission.

We present a statistical study of Jupiter's disk X-ray emissions using 19 years of Chandra X-Ray Observatory (CXO) observations. Previous work has suggested that these emissions are consistent with solar X-rays elastically scattered from Jupiter's upper atmosphere. We showcase a new pulse invariant (PI) filtering method that minimizes instrumental effects which may produce unphysical trends in photon counts across the nearly two-decade span of the observations. We compare the CXO results with solar X-ray flux data from the Geostationary Operational Environmental Satellites X-ray Sensor for the wavelength band 1-8 Å (long channel), to quantify the correlation between solar activity and Jovian disk counts. We find a statistically significant Pearson's Correlation Coefficient of 0.9, which confirms that emitted Jovian disk X-rays are predominantly governed by solar activity. We also utilize the high spatial resolution of the High Resolution Camera Instrument on-board the CXO to map the disk photons to their positions on Jupiter's surface. Voronoi tessellation diagrams were constructed with the Juno Reference Model through Perijove 9 internal field model overlaid to identify any spatial preference of equatorial photons. After accounting for area and scattering across the curved surface of the planet, we find a preference of Jovian disk emission at 2-3.5 Gauss surface magnetic field strength. This suggests that a portion of the disk X-rays may be linked to processes other than solar scattering: the spatial preference associated with magnetic field strength may imply increased precipitation from the radiation belts, as previously postulated.

[The marginal periodontium on osseointegrated implants--literature review and own investigations. 2. Own investigations]. / Das marginale Periodont und enossale Implantate. Literaturübersicht und eigene Untersuchungen. 2. Mitteilung: Eigene Untersuchungen.

19 IMZ-implants with a medium age of incorporation of 10.5 months were examined at four sites concerning their periimplantary situation. Gingival index, bleeding on probing, pocket depth and composition of subgingival plaque corresponded in 67% of the examined sites with periodontal health. Favourable correlations were stated between the values of plaque index and of the bleeding on probing as well as between the wide of fixed gingiva and the dimension of gingival recession. Compared to bridge constructions more unfavourable results concerning the amount of plaque and clinical criteria of the gingival margin were observed in case of mucosal fixed prostheses.

[Construction and managing of maintenance care in periodontology]. / Aufbau und Gestaltung einer Dispensairebetreuung in der Periodontologie.

The maintenance care of periodontal treated patients is the necessary prerequisite for the individual long-life tooth preservation. The recall interval derives from the recidivity, the compliance of the patient, and from the individual disposition. The use of a self-developed data-bank-system relieve evaluation and processing of the extensive data which will be raised site-specific in the recall session. It will be given some directions to the content of the periodontal maintenance care.

[Acute and chronic necrotizing ulcerative gingivitis]. / Die akute und chronische nekrotisierende, ulzerative Gingivitis.

The development of an acute necrotizing ulcerative gingivitis (ANUG) is connected with preexisting gingivitis and factors of disposition which are able to influence the host resistance. Typical clinical signs of ANUG are necrosis of interdental gingiva, bleeding and pain. Concerning to clinical sign there is a differentiation between the acute and the chronic necrotizing gingivitis. The treatment of ANUG follows the general rules of gingivitis-therapy and will be modified concerning to the clinical signs. It will propose a regular follow-up for prevention of recidivation.

[Concepts of pathogenesis of periodontal diseases. Conclusions for education, continued professional training, development, medical care and research]. / Pathogenesekonzepte periodontaler Erkrankungen. Schlussfolgerungen für die Aus-, Weiter- und Fortbildung, medizinische Betreuung sowie Forschung.

Following the real pathogenesis-concepts of periodontal diseases proposals are given for stomatological care, gradual and postgradual education and research work. This material is the short summary of a large one which was discussed at the 3d working session of the Society of Periodontology of GDR.

[Structural changes in the dental hard substances and jaw bones of animals due to short-duration weightlessness]. / Strukturveränderungen an tierischen Zahnhartsubstanzen und Kieferknochen durch kurzdauernde Schwerelosigkeit.

Molars, incisors and parts of corpus mandibulae from a total of 40 male, 30 female (WISTAR SPF), who were exposed for a short-time microgravity, and of their 90 d old offspring were examined. It was calculated the carbonateapatite content in the teeth and in bone in percent by infrared spectroscopy. In terms of quantitative parameters the substances of the space flight group versus the controls varied clearly. Quality and size of these changes depend from sex, investigated material and time of space flight. It can be concluded that an accommodation to the flight stress is possible without any functional disorders also in the oral system.