790 research outputs found
Longitudinal data with dropouts: a comparison of pattern mixture models with complete case analysis
Pattern mixture models constitute an alternative to selection models (Little & Rubin, 1987). Little & Wang (1996) introduced pattern mixture models for analyzing multivariate normal longitudinal data with missing values. This paper was the theoretical foundation and the induce to investigate the small sample properties of pattern mixture models compared with complete case analysis. The main point of interest, of the simulations, was the mean square error of the estimated model parameters. Parameters estimated by the pattern mixture model are very satisfying under ignorable mechanism but they have to be scanned carefully under nonignorable mechanism
Granularzelltumor des Larynx
Zusammenfassung: Granularzelltumoren (GZT) sind subkutan oder submukös gelegene, gutartige Tumoren neurogenen Ursprungs. Sie treten häufig im Kopf-Hals-Bereich auf, insbesondere in der Zunge. Bisher wurden etwa 200 laryngeale GZT beschrieben. Meist sind dabei die Stimmlippen und die posteriore Glottis betroffen. Eine Unterscheidung von einer chronischen Entzündung oder einem Malignom ist nur mittels Biopsie möglich. Als Therapie der Wahl wird die vollständige Exzision empfohlen, wobei Tumorausdehnung und zu erwartende Morbidität die Radikalität des Vorgehens bestimmen. Bei vollständiger Entfernung sind Rezidive selte
Laryngeales Kontaktgranulom: Ätiologie, Symptomatik, Diagnose und Therapie
Zusammenfassung: Kontaktgranulome sind gutartige, meist einseitige chronisch entzündliche Erkrankungen im Bereich des Processus vocalis des Kehlkopfs. Auf der Gegenseite findet sich oft an korrespondierender Stelle ein Kontaktulkus. Fremdkörpergefühl, Räusperzwang, Heiserkeit und eine verminderte stimmliche Belastbarkeit stehen klinisch im Vordergrund, insbesondere bei Patienten mit Sprechberufen und mangelnder Stimmtechnik. Ein Malignom kann nahezu immer anamnestisch und klinisch ausgeschlossen werden, weshalb eine Biopsie nur bei Malignomverdacht begründet ist. Bei Verdacht auf eine gastroösophageale Refluxkrankheit (GERD) ist eine entsprechende fachärztliche Abklärung angezeigt. Das Therapieprinzip sollte aufgrund der Multikausalität für jeden Patienten entsprechend angepasst werden. Dabei soll eine logopädische Stimmtherapie als Basis jeglicher Therapie angeordnet werden. Eine Antirefluxtherapie sowie eine psychologische Beratung können gelegentlich hilfreich sein. Operative Abtragungen sollen vermieden werden wegen der Gefahr des Rezidivs. Anhand von 2Fallbeispielen wird der klassische Verlauf des Krankheitsbildes geschildert und anschießend auf Ätiologie, Symptome, Diagnostik und Therapie eingegange
HSP70 Expression in Skeletal Muscle of Patients with Peripheral Arterial Occlusive Disease
AbstractObjectives: heat shock protein (HSP70) has been studied in the ischaemic myocardium and proven to provide protection against ischaemia. However, HSP70 in ischaemic skeletal muscle in patients with peripheral arterial occlusive disease (PAOD) has not been reported.Methods: thirty-four patients with PAOD (Fontaine's criteria: stage II: 15; III: 9 and IV: 10, respectively) and ten non-PAOD controls were enrolled in the study. Calf muscle samples were taken. HSP70 was quantitated by SDS-PAGE using ultrasensitive silver staining with reference to a series of standard HSP70, and HSP70 mRNA was estimated using RT-PCR.Results: in comparison with the controls [median with range: 24.8 (14.1–35.6) ng in 2.5μg total protein], HSP70 was increased significantly in PAOD [stage II: 93.1 (62.7–114.3); stage III: 110.1 (89.7–134.5) and stage IV: 77.4 (67.3–101.1)]. Similar results were obtained with HSP70 mRNA.Conclusions: HSP70 is increased in the ischaemic skeletal muscle in patients with PAOD, and HSP70 expression is different with regard to clinical stages, and the upregulation of HSP70 mRNA implies that the expression of HSP70 seems to be regulated at transcriptional level
Avaliação do teor e produtividade de óleo essencial de nove procedências de Lippia Alba no terceiro corte.
Femtosecond Electron Transfer from the Excited State of Chemically Anchored Chromophores into the Empty Conduction Band of Nanocrystalline Spong-like TiO<sub>2</sub> Films*
Learning to Reach after Learning to Look: a Study of Autonomy in Learning Sensorimotor Transformations
Composição do óleo essencial de Piper caldense C.D.C. e Piper solmsianum C.D.C. provenientes da Mata Atlântica do litoral do Paraná.
Hsp27 anti-sense oligonucleotides sensitize the microtubular cytoskeleton of Chinese hamster ovary cells grown at low pH to 42 degrees C-induced reorganization
Chinese hamster ovary (CHO) cells maintained in vitro at pH 6.7 were used to model cells in the acidic environment of tumours. CHO cells grown at pH 6.7 develop thermotolerance during 42 degrees C heating at pH 6.7 and their cytoskeletal systems are resistant to 42 degrees C-induced perinuclear collapse. Hsp27 levels are elevated in cells grown at pH 6.7 and are further induced during 42 degrees C heating, while Hsp70 levels remain low or undetectable, suggesting that Hsp27 is responsible for some of the novel characteristics of these cells. An anti-sense oligonucleotide strategy was used to test the importance of Hsp27 by lowering heat-induced levels of the protein. The response of the microtubular cytoskeleton to heat was used as an endpoint to assess the effectiveness of the anti-sense strategy. Treatment with anti-sense oligonucleotides prevented the heat-induced increase of Hsp27 levels measured immediately following heat. Treatment with anti-sense oligonucleotides also sensitized the cytoskeleton of cells grown at low pH to heat-induced perinuclear collapse. However, cytoskeletal collapse was not evident in cells grown at pH 6.7 and treated with 4-nt mismatch oligonucleotides or in control cells maintained and heated at pH 6.7. The cytoskeleton collapsed around the nucleus in cells cultured and heated at pH 7.3. These results confirm that over-expression of Hsp27 confers heat protection to the microtubular cytoskeleton in CHO cells grown at low pH
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