Leitfaden bei dem Elementar-Unterrichte in der mosaischen Glaubens- und Pflichtenlehre : der Vernunft, der Schrift u. d. Bedürfnisse unserer Zeit gemäss

[Verf.: Moses Israel Landau]

Negative density dependence of seed dispersal and seedling recruitment in a Neotropical palm

Negative density dependence (NDD) of recruitment is pervasive in tropical tree species. We tested the hypotheses that seed dispersal is NDD, due to intraspecific competition for dispersers, and that this contributes to NDD of recruitment. We compared dispersal in the palm Attalea butyracea across a wide range of population density on Barro Colorado Island in Panama and assessed its consequences for seed distributions. We found that frugivore visitation, seed removal and dispersal distance all declined with population density of A. butyracea, demonstrating NDD of seed dispersal due to competition for dispersers. Furthermore, as population density increased, the distances of seeds from the nearest adult decreased, conspecific seed crowding increased and seedling recruitment success decreased, all patterns expected under poorer dispersal. Unexpectedly, however, our analyses showed that NDD of dispersal did not contribute substantially to these changes in the quality of the seed distribution; patterns with population density were dominated by effects due solely to increasing adult and seed density.

Dogmatisch-historische Beleuchtung des alten Judenthums

von Aaron Günzburg

Geschichte der jüdischen Ärzte : ein Beitrag zur Geschichte d. Medicin

von Richard Landau

Das Levitenhaus : häusliche Ceremonial- u. Ritual-Gesetze, das Schema-Lesen, Schaufäden u. Denkriemen enthaltend ; Abhandlung in deutscher Sprache, a. d. Hebr. bearb. u. mit Erklärungen versehen

Isaac Landau

Das Levitenhaus : häusliche Ceremonial- u. Ritual-Gesetze, das Schema-Lesen, Schaufäden, Denkriemen, Hebe am Teige, Lichtanzünden, u. das Fleischsalzen enthaltend ; a. d. Hebr. bearb. u. mit Erklärungen versehen

Isaac Landau

Das mosaisch-talmudische Eherecht : auf Verlangen Kaiser Josefs des Zweiten ... erstattetes Gutachten

von Ezekiel Landau. Zum ersten Male veröffentl. u. mit Einl. u. Anm. vers. von Alexander Kisch

Jüdische Privatbriefe aus dem Jahre 1619 : mit 8 Schrifttaf.

nach den Originalen d. K.u.K. Haus-, Hof- u. Staatsarchivs im Auftr. d. Hist. Lomm d. israelit. Kultusgemeinde in Wien hrsg. von Alfred Landau ...

Der Beilis-Prozess und seine Vorläufer in der Geschichte

von Isak Menscher

Judaism in music : Jacques François Halévy ; a lecture

by J. L. Landau

Die gegensinnigen Wörter im Alt- und Neuhebräischen sprachvergleichend dargestellt

von E. Landau

Feasible Dose Reduction in Routine Chest Computed Tomography Maintaining Constant Image Quality Using the Last Three Scanner Generations: From Filtered Back Projection to Sinogram-affirmed Iterative Reconstruction and Impact of the Novel Fully Integrated Detector Design Minimizing Electronic Noise

OBJECTIVE The aim of the present study was to evaluate a dose reduction in contrast-enhanced chest computed tomography (CT) by comparing the three latest generations of Siemens CT scanners used in clinical practice. We analyzed the amount of radiation used with filtered back projection (FBP) and an iterative reconstruction (IR) algorithm to yield the same image quality. Furthermore, the influence on the radiation dose of the most recent integrated circuit detector (ICD; Stellar detector, Siemens Healthcare, Erlangen, Germany) was investigated. MATERIALS AND METHODS 136 Patients were included. Scan parameters were set to a thorax routine: SOMATOM Sensation 64 (FBP), SOMATOM Definition Flash (IR), and SOMATOM Definition Edge (ICD and IR). Tube current was set constantly to the reference level of 100 mA automated tube current modulation using reference milliamperes. Care kV was used on the Flash and Edge scanner, while tube potential was individually selected between 100 and 140 kVp by the medical technologists at the SOMATOM Sensation. Quality assessment was performed on soft-tissue kernel reconstruction. Dose was represented by the dose length product. RESULTS Dose-length product (DLP) with FBP for the average chest CT was 308 mGy*cm ± 99.6. In contrast, the DLP for the chest CT with IR algorithm was 196.8 mGy*cm ± 68.8 (P = 0.0001). Further decline in dose can be noted with IR and the ICD: DLP: 166.4 mGy*cm ± 54.5 (P = 0.033). The dose reduction compared to FBP was 36.1% with IR and 45.6% with IR/ICD. Signal-to-noise ratio (SNR) was favorable in the aorta, bone, and soft tissue for IR/ICD in combination compared to FBP (the P values ranged from 0.003 to 0.048). Overall contrast-to-noise ratio (CNR) improved with declining DLP. CONCLUSION The most recent technical developments, namely IR in combination with integrated circuit detectors, can significantly lower radiation dose in chest CT examinations.