Search

Your search keyword '"Haffner, S"' showing total 1,123 results
Start Over Author "Haffner, S"
1,123 results on '"Haffner, S"'

1. No well-defined remnant Fermi surface in Sr2CuO2Cl2

Author

Haffner, S., Brammeier, D. M., Olson, C. G., Miller, L. L., and Lynch, D. W.

Subjects
Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons
Abstract

In angle-resolved photoelectron spectra of the antiferromagnetic insulators Ca2CuO2Cl2 and Sr2CuO2Cl2 a sharp drop of the spectral intensity of the lowest-lying band is observed along a line in k space equivalent to the Fermi surface of the optimally doped high-temperature superconductors. This was interpreted as a signature of the existence of a remnant Fermi surface in the insulating phase of the high-temperature superconductors. In this paper it is shown that the drop of the spectral intensity is not related to the spectral function but is a consequence of the electron-photon matrix element, Comment: 4 pages, 3 figures

Published
2000
Full Text
View/download PDF

2. Analysis of the valence band photoemission spectrum of Sr$_2$CuO$_2$Cl$_2$ along the high-symmetry directions

Author

Hayn, R., Rosner, H., Yushankhai, V. Yu., Haffner, S., Dürr, C., Knupfer, M., Krabbes, G., Golden, M. S., Fink, J., Eschrig, H., Singh, D. J., Hien, N. T., Menovsky, A. A., Jung, Ch., and Reichardt, G.

Subjects
Condensed Matter
Abstract

Band structure calculations have been used to identify the different bands contributing to the polarisation-dependent photoemission spectra of the undoped model cuprate Sr$_2$CuO$_2$Cl$_2$ at the high-symmetry points of the CuO$_2$ plane $\Gamma$, $(\pi/a,0)$ and $(\pi/a,\pi/a)$ and along the high-symmetry directions $\Gamma - (\pi/a,\pi/a)$ and $\Gamma - (\pi/a,0)$. Results from calculations within the local density approximation (LDA) have been compared with calculations taking into account the strong electron correlations by LDA+U, with the result that the experimental order of energy levels at the high-symmetry points is better described by the LDA+U calculation than by the simple LDA. All the main peaks in the photoemission spectra at the high symmetry points could be assigned to different Cu 3$d$ and O 2$p$ orbitals which we have classified according to their point symmetries. The dispersions along the high-symmetry directions were compared with an 11-band tight-binding model which was fitted both to the LDA+U band structure calculation and the angle-resolved photoemission data. The mean field treatment successfully describes the oxygen derived bands but shows discrepancies for the copper ones., Comment: 13 pages, 16 figures, 5 tables

Published
1998
Full Text
View/download PDF

34. Cardioprotective effects of KB-R7943: a novel inhibitor of the reverse mode of Na+/Ca2+ exchanger

Author

Ladilov, Y. Haffner, S., Balser-Schafer, C., Maxeiner, H., and Piper, H.M.

Subjects
Heart cells -- Research, Rats -- Physiological aspects, Calcium in the body -- Physiological aspects, Ischemia -- Research, Cytosol -- Research, Sodium in the body -- Physiological aspects, Biological sciences
Abstract

Research was conducted to examine the cardioprotective effects of KB-R7943 (KB) in isolated rat cardiomyocytes exposed to 80 minutes of simulated ischemia and 15 minutes of reoxygenation. The objective was to investigate, on the cellular level, the effects ofKB on cytosolic ion homeostatis during ATP depletion. Results indicate that the treatment of KB during anoxia effectively inhibits CA2+ overload and attenuates reoxygenation-induced injury of cardiomyocytes.

Published
1999

38. Updated risk factors should be used to predict development of diabetes

Author

Bethel, M, Hyland, K, Chacra, A, Deedwania, P, Fulcher, G, Holman, R, Jenssen, T, Levitt, N, McMurray, J, Boutati, E, Thomas, L, Sun, J, Haffner, S, and Group, NAVIGATOR Study

Subjects
Blood Glucose, Male, Diabetic Cardiomyopathies, Endocrinology, Diabetes and Metabolism, Type 2 diabetes, 030204 cardiovascular system & hematology, Nateglinide, Global Health, Impaired glucose tolerance, 0302 clinical medicine, Endocrinology, Health Transition, Risk Factors, fasting plasma glucose, 030212 general & internal medicine, Randomized Controlled Trials as Topic, post-prandial glucose, Incidence, Combined Modality Therapy, Cardiovascular Diseases, Practice Guidelines as Topic, Disease Progression, Female, type 2 diabetes, medicine.drug, medicine.medical_specialty, diabetes risk prediction, Diabetes risk, Population health, Models, Biological, Prediabetic State, 03 medical and health sciences, Internal medicine, Diabetes mellitus, Internal Medicine, medicine, Humans, Healthy Lifestyle, Time point, Proportional Hazards Models, business.industry, Glucose Tolerance Test, medicine.disease, impaired glucose tolerance, Diabetes Mellitus, Type 2, Emergency medicine, Outcomes research, business, Diabetic Angiopathies, Follow-Up Studies
Abstract

Aims Predicting incident diabetes could inform treatment strategies for diabetes prevention, but the incremental benefit of recalculating risk using updated risk factors is unknown. We used baseline and 1-year data from the Nateglinide and Valsartan in Impaired Glucose Tolerance Outcomes Research (NAVIGATOR) Trial to compare diabetes risk prediction using historical or updated clinical information. Methods Among non-diabetic participants reaching 1 year of follow-up in NAVIGATOR, we compared the performance of the published baseline diabetes risk model with a “landmark” model incorporating risk factors updated at the 1-year time point. The C-statistic was used to compare model discrimination and reclassification analyses to demonstrate the relative accuracy of diabetes prediction. Results A total of 7527 participants remained non-diabetic at 1 year, and 2375 developed diabetes during a median of 4 years of follow-up. The C-statistic for the landmark model was higher (0.73 [95% CI 0.72–0.74]) than for the baseline model (0.67 [95% CI 0.66–0.68]). The landmark model improved classification to modest (40%) 4-year risk, with a net reclassification index of 0.14 (95% CI 0.10–0.16) and an integrated discrimination index of 0.01 (95% CI 0.003–0.013). Conclusions Using historical clinical values to calculate diabetes risk reduces the accuracy of prediction. Diabetes risk calculations should be routinely updated to inform discussions about diabetes prevention at both the patient and population health levels.

Published
2017

48. Results of the ADOPT trial: 97

Author

Viberti, G C, Kahn, S, Haffner, S, Herman, W, Holman, R, Lachin, J, Zinman, B, Heise, M JN, Kravitz, B, and OʼNeill, C

Published
2006

Catalog

Books, media, physical & digital resources
See catalog results