Thermoelektrische Eigenschaften dünner Schichten und Übergitterstrukturen von IV-VI- und V-VI-Verbundhalbleitern

Als ein vielversprechendes Konzept zur Erhöhung der thermoelektrischen Effizienz wird seit Anfang der 90er Jahre die Nutzung niederdimensionaler Systeme angesehen. Aus theoretischen Arbeiten von Hicks und Dresselhaus folgt, dass in ein- und zweidimensionalen Systemen eine Erhöhung der thermoelektrischen Effizienz möglich ist, die einen Durchbruch für die Anwendung thermoelektrischer Wandler zur Folge haben könnte. Die Realisierung solcher niederdimensionaler Systeme ist in geeigneten Mehrlagenstrukturen und durch Verwendung von Halbleiterverbindungen mit unterschiedlicher Energiebandlücke möglich. Ziel des Verbundprojektes Nitherma war es Mehrfachschichtsysteme mit 2-dimensionalem Transportverhalten aus thermoelektrischen Materialien (Pb1-xSrxTe, Bi2(SexTe1-x)3) herzustellen und auf die erwartete hohe thermoelektrische Effizienz zu untersuchen. Diese wurde messtechnischrndurch die Bestimmung der elektrischen Leitfähigkeit, des Seebeck-Koeffizienten und der Wärmeleitfähigkeit parallel zu den Schichtebenen (in-plane-Transporteigenschaft) ermittelt. Ziel dieser Arbeit war einerseits die Verbesserung der Präparations- und Messtechnik bei der Untersuchung der Wärmeleitfähigkeit von Schichten und Schichtsystemen sowie die Demonstration der Reproduzierbarkeit, andererseits die Interpretation der an niederdimensionalen Strukturen ermittelten Transportmessungen. Um den Einfluß der Niederdimensionalität auf die Wärmeleitfähigkeit zu ermitteln, wurden umfangreiche Messungen an unterschiedlich dimensionierten Übergitter- und Multi-Quantum-Well-Strukturen (MQW-Strukturen) durchgeführt. Die Verifizierung der von den Projektpartnern durchgeführten Transportmessungen wurde durch die Messung des Seebeck-Koeffizienten unterstützt.Neben der Charakterisierung durch Transportmessungen erfolgte die Bestimmung der thermoelektrischen Effizienz.

Catálogo y estudio de las gramáticas de italiano para hispanohablantes: siglos XVIII y XIX

El objetivo de la presente investigación, el catálogo y estudio de las gramáticas de italiano destinadas a hispanohablantes de los siglos XVIII y XIX, se encuadra en el macrosector gramaticográfico de la historiografía lingüística, en el cual el estudio de las gramáticas de las lenguas dirigidas a hablantes nativos y a hablantes extranjeros, con los consiguientes cruces y trasvases de tradiciones gramaticales, es de significativo interés como destacan: (i) las tesis doctorales defendidas en los últimos quince años; (ii) los proyectos de investigación dirigidos y coordinados por prestigiosos estudiosos del sector; (iii) los congresos organizados para destacar y compartir las principales actualizaciones en torno a los estudios gramaticográficos; y (iv) las publicaciones que surgen de los tres puntos anteriores. El estudio presenta dos partes centrales: la primera (constituida por los capítulos 2 y 3) es la de catálogo y estudio de las diecinueve gramáticas que conforman el corpus en base a ocho áreas descriptivas (1. información catalográfica, 2. autor, 3. editor, 4. hiperestructura, 5. elementos peritextuales, gramaticales y didácticos, 6. variedad de textos y su secuencia didáctica, 7. caracterización, fuentes e influencias, y 8. localización); la segunda (capítulo 4) es la de estudio gramaticográfico de conjunto de los datos más relevantes de las areas de estudio utilizadas en las dos primeras partes. De este modo, daremos un panorama de conjunto sobre (i) la cronología de las obras y sus ediciones y rempresiones; (ii) la nacionalidad, profesión, condición religiosa, etc. de autores; (iii) la geografía de ediciones y editores; (iv) la descripción hiperestructural de las obras; (v) la estructura de los elementos peritextuales; (vi) las partes gramaticales y elementos que las componen; (vii) el verbo: definiciones y paradigma verbal; (vii) los elementos didácticos; (viii) las líneas de descripción gramatical; (ix) la localización de las gramáticas en las bibliotecas españolas.

[Ultrasonic and radiographic quantification of palmar angulation in metacarpal IV and V neck fractures]

Therapy of metacarpal neck fractures depending on radiographically measured palmar angulation is discussed controversially in the literature. Some authors describe normal hand function of malunited metacarpal neck fractures with a palmar angulation up to 70°; others define 30° as the uppermost limit to maintain normal hand function. However, the methods of measuring palmar angulation are not clearly defined. Here, we present a new method to measure palmar angulation using ultrasound. The aim of this prospective study is to compare the radiographic methods of measuring palmar angulation with the ultrasound method. PATIENTS/MATERIAL AND METHOD: 20 patients with a neck fracture of the metacarpals IV or V were treated either conservatively or operatively. 2 weeks after trauma or operation, an x-ray was performed. 2 examiners measured the palmar angulation on the oblique and lateral projections using 2 different methods (medullary canal and dorsal cortex methods). At the same time, the 2 examiners performed measurements of palmar angulation using ultrasound. The measurements obtained with the different methods as well as by the 2 examiners at 2 different terms were compared. Intra- and interobserver reliability of each method was calculated, and for the ultrasound method a test for accuracy of the measured angles was performed.

Clinical herniation – how to improve differentiation between WFNS grade IV and V

Objective: Current data show a favorable outcome after poor grade subarachnoid hemorrhage (SAH) in up to 50% of patients. This limits the use of the WFNS scale for drawing treatment decisions. We therefore analyzed how clinical signs of herniation might improve the existing WFNS grading. Therefore we compared the current WFNS grading and a modified WFNS grading with respect to outcome. Method: We performed a retrospective study including 182 poor grade SAH patients. Patients were graded according to the original WFNS scale and additionally into a modified classification the “WFNS herniation” (WFNSh grade IV: no herniation; grade V clinical signs of herniation). Outcome was compared between these two grading systems with respect to the dichotomized modified Rankin scale after 6 months. Results: The WFNS and WFNSh showed a positive predictive value (PPV) for poor outcome of 74.3% (OR 3.79, 95% confidence interval [CI]=1.94, 7.54) and 85.7% (OR 8.27, 95% CI=3.78, 19.47), respectively. With respect to mortality the PPV was 68.3% (OR 3.9, 95% CI=2.01, 7.69) for the WFNS grade V and 77.9% (OR 6.22, 95% CI=3.07, 13.14) for the WFNSh grade V. Conclusions: Using positive clinical signs of herniation instead of “no response to pain stimuli” (motor Glasgow Coma Scale Score) can improve WFNS V grading. Using this modification, prediction of poor outcome or death improves.

Henrici Opitii ... Ḥatsar Leshon ha-Ḳodesh Hoc Est Atrivm Lingvæ Sanctæ : Quo exhibentur I. Consilium de Studio Linguæ S. etiam sine viva manuductione feliciter tractando. II. Grammaticæ Hebr. Compendium ... III. Textus cum Praxi Hebræo-Analytica ... IV. Lexici Hebræi Compendium ... V. Index Anomalorum difficiliorum ...

Vorlageform des Erscheinungsvermerks: Francofurti Et Lipsiæ, M DCC XXXVIII. - Text teilw. lat., teilw. hebr., in hebr. Schrift

Institutionum Hebraicarum Libri Sex : I. De Orthographia. II. De Etymologia. III. De Syntaxi. IV. De Prosodia. V. De Masoreth. VI. De Compositis, anomolis & difficilibus

Auctore Valentino Schindlero ...

Der Zionismus im Urtheile hervorragender Zeitgenossen (IV und V)

Theodor Herzl

Ms. lat. fol. 1 - Lectura super IV et V Codicis

Vorbesitzer: Ludwig von Marburg zum Paradies

Fragm. germ. III 4 - Facetus 'Cum nihil utilius', lat.-dt. (V. 96 - 102, 105 - 111). Disticha Catonis, lat.-dt. (IV 32 - 43)

Trägerband: Inc. qu. 1272; Vorbesitzer: Dominikanerkloster Frankfurt am Main

Mansilla, Lucio V. 2012. Diario de viaje a Oriente (1850- 51) y otras crónicas del viaje oriental. Ed., introd. y notas María Rosa Lojo, dir.; Marina Guidotti, María Laura Pérez Gras y Victoria Cohen Imach. (EALA, Ediciones Académicas de Literatura Argentina, Siglos XIX y XX, 2). Buenos Aires: Corregidor. 372 pp.

Fil: Molina, Hebe Beatriz. CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas) - Universidad Nacional de Cuyo

Human semaphorins A(V) and IV reside in the 3p21.3 small cell lung cancer deletion region and demonstrate distinct expression patterns.

Semaphorins and collapsins make up a family of conserved genes that encode nerve growth cone guidance signals. We have identified two additional members of the human semaphorin family [human semaphorin A(V) and human semaphorin IV] in chromosome region 3p21.3, where several small cell lung cancer (SCLC) cell lines exhibit homozygous deletions indicative of a tumor suppressor gene. Human semaphorin A(V) has 86% amino acid homology with murine semaphorin A, whereas semaphorin IV is most closely related to murine semaphorin E, with 50% homology. These semaphorin genes are approximately 70 kb apart flanking two GTP-binding protein genes, GNAI-2 and GNAT-1. In contrast, other human semaphorin gene sequences (human semaphorin III and homologues of murine semaphorins B and C) are not located on chromosome 3. Human semaphorin A(V) is translated in vitro into a 90-kDa protein, which accumulates at the endoplasmic reticulum. The human semaphorin A(V) (3.4-kb mRNA) and IV (3.9- and 2.9-kb mRNAs) genes are expressed abundantly but differentially in a variety of human neural and nonneural tissues. Human semaphorin A(V) was expressed in only 1 out of 23 SCLCs and 7 out of 16 non-SCLCs, whereas semaphorin IV was expressed in 19 out of 23 SCLCs and 13 out of 16 non-SCLCs. Mutational analysis in semaphorin A(V) revealed mutations (germ line in one case) in 3 of 40 lung cancers. Our data suggest the need to determine the function of human semaphorins A(V) and IV in nonneural tissues and their role in the pathogenesis of lung cancer.

Peptide inhibitors of peptidyltransferase alter the conformation of domains IV and V of large subunit rRNA: a model for nascent peptide control of translation.

Peptides of 5 and 8 residues encoded by the leaders of attenuation regulated chloramphenicol-resistance genes inhibit the peptidyltransferase of microorganisms from the three kingdoms. Therefore, the ribosomal target for the peptides is likely to be a conserved structure and/or sequence. The inhibitor peptides "footprint" to nucleotides of domain V in large subunit rRNA when peptide-ribosome complexes are probed with dimethyl sulfate. Accordingly, rRNA was examined as a candidate for the site of peptide binding. Inhibitor peptides MVKTD and MSTSKNAD were mixed with rRNA phenol-extracted from Escherichia coli ribosomes. The conformation of the RNA was then probed by limited digestion with nucleases that cleave at single-stranded (T1 endonuclease) and double-stranded (V1 endonuclease) sites. Both peptides selectively altered the susceptibility of domains IV and V of 23S rRNA to digestion by T1 endonuclease. Peptide effects on cleavage by V1 nuclease were observed only in domain V. The T1 nuclease susceptibility of domain V of in vitro-transcribed 23S rRNA was also altered by the peptides, demonstrating that peptide binding to the rRNA is independent of ribosomal protein. We propose the peptides MVKTD and MSTSKNAD perturb peptidyltransferase center catalytic activities by altering the conformation of domains IV and V of 23S rRNA. These findings provide a general mechanism through which nascent peptides may cis-regulate the catalytic activities of translating ribosomes.