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Ernst A, Hofmann S, Ahmadi R, Becker N, Korshunov A, Engel F, Hartmann C, Felsberg J, Sabel M, Peterziel H, Durchdewald M, Hess J, Barbus S, Campos B, Starzinski-Powitz A, Unterberg A, Reifenberger G, Lichter P, Herold-Mende C, Radlwimmer B. Genomic and Expression Profiling of Glioblastoma Stem Cell-Like Spheroid Cultures Identifies Novel Tumor-Relevant Genes Associated with Survival. Clin Cancer Res 2009; 15:6541-50. [DOI: 10.1158/1078-0432.ccr-09-0695] [Citation(s) in RCA: 130] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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153
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Ernst A, Sazinsky SL, Hui S, Currell B, Dharsee M, Seshagiri S, Bader GD, Sidhu SS. Rapid Evolution of Functional Complexity in a Domain Family. Sci Signal 2009; 2:ra50. [DOI: 10.1126/scisignal.2000416] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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154
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Uibbracker C, Szunyogh L, Újfalussy B, Weinberger P, Ernst A, Dederichs PH. Screening transformations for two-dimensional structure constants. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/13642819808206740] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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155
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van den Bussche H, Ernst A, Jahncke-Latteck Ä, Schramm U. Kooperation zwischen Hausärzten und Pflegediensten bei Demenzpatienten – Erste Ergebnisse der Interventionsstudie KOVERDEM. DAS GESUNDHEITSWESEN 2009. [DOI: 10.1055/s-0029-1239123] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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156
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Gierz I, Suzuki T, Frantzeskakis E, Pons S, Ostanin S, Ernst A, Henk J, Grioni M, Kern K, Ast CR. Silicon surface with giant spin splitting. PHYSICAL REVIEW LETTERS 2009; 103:046803. [PMID: 19659381 DOI: 10.1103/physrevlett.103.046803] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Indexed: 05/28/2023]
Abstract
We demonstrate a giant Rashba-type spin splitting on a semiconducting substrate by means of a Bi-trimer adlayer on a Si(111) wafer. The in-plane inversion symmetry is broken inducing a giant spin splitting with a Rashba energy of about 140 meV, much larger than what has previously been reported for any semiconductor heterostructure. The separation of the electronic states is larger than their lifetime broadening, which has been directly observed with angular resolved photoemission spectroscopy. The experimental results are confirmed by relativistic first-principles calculations.
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Ernst A, Okkels H, Grove A, Svarrer T, Knudsen A, Madsen PH, Krarup HB. Telomerase activity determined by conventional telomeric repeat amplification protocol and reverse transcriptase‐polymerase chain reaction assay in ovarian lesions: A comparison of assays. Scand J Clin Lab Invest 2009; 66:287-97. [PMID: 16777757 DOI: 10.1080/00365510600608464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Telomerase is capable of restoring telomeric sequence lost during replication. No or low levels of telomerase activity are present in normal somatic cells, whereas up to 85-90% of all cancer cells express telomerase activity, suggesting telomerase as a possible tumor marker. The catalytic subunit, hTERT, correlates with the activity of the enzyme. MATERIAL AND METHODS Telomerase activity in ovarian tissue was measured by the functional telomeric repeat amplification protocol (TRAP)eze assay, and a quantitative reverse-transcriptase-polymerase chain reaction (RT-PCR) assay measuring the expression of the telomerase catalytic subunit, hTERT. RESULTS A weakly positive correlation was found between telomerase activity and severity of ovarian disease using the results of the TRAP assay, compared to a strongly positive correlation considering the results obtained in the RT-PCR assay. A statistically significant difference between the benign and borderline groups was present using the RT-PCR assay, allowing for screening for both borderline and primary malignant conditions with a specificity of 97% and a sensitivity of 68%. No significant statistical difference was found between telomerase activity in benign and borderline conditions when using the TRAP assay. When screening for primary malignancy, the specificity and sensitivity rates were 94% and 21%, respectively. CONCLUSIONS The RT-PCR assay allowed discrimination between benign and borderline and malignant cases, and thereby proved superior to the TRAP assay, which could not discriminate the benign cases from the borderline cases. This suggests that the RT-PCR assay may be useful in screening for both borderline and primary malignancy in ovarian lesions.
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Balashov T, Schuh T, Takács AF, Ernst A, Ostanin S, Henk J, Mertig I, Bruno P, Miyamachi T, Suga S, Wulfhekel W. Magnetic anisotropy and magnetization dynamics of individual atoms and clusters of Fe and Co on Pt(111). PHYSICAL REVIEW LETTERS 2009; 102:257203. [PMID: 19659116 DOI: 10.1103/physrevlett.102.257203] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Indexed: 05/28/2023]
Abstract
The recently discovered giant magnetic anisotropy of single magnetic Co atoms raises the hope of magnetic storage in small clusters. We present a joint experimental and theoretical study of the magnetic anisotropy and the spin dynamics of Fe and Co atoms, dimers, and trimers on Pt(111). Giant anisotropies of individual atoms and clusters as well as lifetimes of the excited states were determined with inelastic scanning tunneling spectroscopy. The short lifetimes due to hybridization-induced electron-electron scattering oppose the magnetic stability provided by the magnetic anisotropies.
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159
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Wagner JH, Rademacher G, Ernst A, Todt I. [Cochlear implants in isolated temporal bones: evaluation of electrode position with 64-slice computed tomography]. HNO 2009; 57:575-9. [PMID: 19455290 DOI: 10.1007/s00106-008-1810-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND For the functional outcome after cochlear implant surgery, the electrode position is of essential importance. Therefore, radiological techniques to localize the electrode within the cochlea are becoming increasingly important. In our study, we used multi-slice computed tomography (CT) to find radiological criteria to allocate the electrode within the cochlea. METHODS Ten Nucleus 24 RCA electrodes were implanted into isolated human temporal bones using an extended cochleostomy and the Advance Off-Stylet technique. Five electrodes were implanted into the scala tympani and five into the scala vestibuli. After implantation, the temporal bones were blinded to the radiologist, and 64-slice CT scans were performed and analysed. RESULTS AND CONCLUSIONS In all 10 cases, the surgical positioning of the electrode was equal to the radiological analysis of the CT scans. Radiological criteria were found that permit correct identification of the electrode within the cochlea. We think that this technique is sufficient for most questions concerning quality control and is widely available.
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Eberhardt R, Ernst A, Herth FJF. Ultrasound-guided transbronchial biopsy of solitary pulmonary nodules less than 20 mm. Eur Respir J 2009; 34:1284-7. [PMID: 19460785 DOI: 10.1183/09031936.00166708] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Transbronchial biopsy of solitary pulmonary nodules (SPNs) is usually performed under fluoroscopic guidance, but success varies widely. Endobronchial ultrasonography (EBUS) may increase the likelihood of success. The ability of EBUS-guided transbronchial biopsy to sample SPNs of <20 mm in diameter was assessed. All patients seen between June 2004 and August 2007 in whom computed tomography identified a SPN of <20 mm underwent bronchoscopic general anaesthesia or moderate sedation for a radial EBUS-guided examination. If a typical ultrasonographic picture of solid tissue could be identified, specimens were taken through a catheter with forceps. If the node was not detected within 20 min, the procedure was terminated. Of 100 nodules detected in 100 consecutive patients, 67 (mean diameter 15 mm) were visualised using EBUS and biopsy specimens taken. A diagnosis was established for 46 (46%) patients. If the lesion was visualised by EBUS, the diagnostic success was 69% (46 out of 67). The 33 patients whose nodules could not be sampled underwent surgical biopsy. Pneumothorax occurred in three patients. For SPNs of <20 mm that can be detected using ultrasound, EBUS-guided transbronchial biopsy is safe and effective.
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161
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Gdynia HJ, Weydt P, Ernst A, Klein S, Sperfeld AD, Riecker A. Myositis associated with localized lipodystrophy: an unrecognized condition? Eur J Med Res 2009; 14:228-30. [PMID: 19541581 PMCID: PMC3351983 DOI: 10.1186/2047-783x-14-5-228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Lipodystrophies represent a heterogeneous group of diseases characterized by altered body fat repartition and often metabolic alterations. Here we illustrate a 20 year old male with myositis in association with localized lipodystrophy. Immunohistochemical stainings revealed a regular pattern of dystrophin, dysferlin, sarcoglycans, and theletonin. Furtermore, there was no evidence of Lamin A/C deficiency. A nearly identical clinical and histological picture has been described in three patients up to now. Although it is difficult to speculate on a causative pathophysiological mechanism at this time, it is possible that this association represents an unrecognized condition.
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Meyerheim HL, Tusche C, Ernst A, Ostanin S, Maznichenko IV, Mohseni K, Jedrecy N, Zegenhagen J, Roy J, Mertig I, Kirschner J. Wurtzite-type CoO nanocrystals in ultrathin ZnCoO films. PHYSICAL REVIEW LETTERS 2009; 102:156102. [PMID: 19518654 DOI: 10.1103/physrevlett.102.156102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2008] [Indexed: 05/27/2023]
Abstract
Surface x-ray diffraction experiments reveal that, in cobalt-doped ZnO films two to five monolayers thick, Wurtzite-type CoO nanocrystals are coherently embedded within a hexagonal boron-nitride- (h-BN)-type ZnO matrix, supporting the model of a phase separation. First-principles calculations confirm that, in contrast with ZnO, the formation of h-BN-type CoO is unfavorable in the ultrathin film limit. Our results are important for understanding magnetic properties of transition metal-doped semiconductors in general.
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Rudovich N, Ernst A, Pivovarova O, Trabert A, Bergmann A, Pfeiffer AFH. Acarbose increases atrial natriuretic peptide levels in subjects with metabolic syndrome: A novel mechanism of cardiovascular protection. DIABETOL STOFFWECHS 2009. [DOI: 10.1055/s-0029-1222063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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164
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Eberhardt R, Ernst A, Herth FJF. Eine neue Methode zur Messung von Atemwegsdrücken und -flüssen in einzelnen Lungenlappen. Pneumologie 2009. [DOI: 10.1055/s-0029-1213964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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165
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Herth FJF, Eberhardt R, Kreuter M, Ernst A. Endoskopische Lungenvolumenreduktion mit Spiralen – eine feasibility Studie. Pneumologie 2009. [DOI: 10.1055/s-0029-1213903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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166
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Eberhardt R, Ernst A, Hoffmann H, Herth FJF. Erfolgsrate von EBUS-gesteuerten transbronchialen Biopsien in der Diagnostik pulmonaler Rundherde kleiner 2cm. Pneumologie 2009. [DOI: 10.1055/s-0029-1213803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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167
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Kappes J, Eberhardt R, Ernst A, Herth FJF. Effektivität der endobronchialen ultraschallgesteurterten transbronchialen Nadelspiration (EBUS-TBNA) hilärer Lymphknoten zur Diagnose des Bronchialkarzinoms. Pneumologie 2009. [DOI: 10.1055/s-0029-1213987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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168
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Kreuter M, Ernst A, Eberhardt R, Herth FJF. Kombinierte endoösophageale und endobronchiale Ultraschall-geführte Feinnadel-Aspiration mediastinaler Lymphknoten mittels eines Bronchoskops bei 150 Patienten mit Malignomverdacht. Pneumologie 2009. [DOI: 10.1055/s-0029-1214096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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169
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Eberhardt R, Ernst A, Hoffmann H, Herth FJF. Erfolgsrate von EBUS-gesteuerten transbronchialen Biopsien in der Diagnostik pulmonaler Rundherde kleiner 2cm. Pneumologie 2009. [DOI: 10.1055/s-0029-1214099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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170
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Däne M, Lüders M, Ernst A, Ködderitzsch D, Temmerman WM, Szotek Z, Hergert W. Self-interaction correction in multiple scattering theory: application to transition metal oxides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:045604. [PMID: 21715818 DOI: 10.1088/0953-8984/21/4/045604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We apply to transition metal monoxides the self-interaction corrected (SIC) local spin density approximation, implemented locally in the multiple scattering theory within the Korringa-Kohn-Rostoker (KKR) band structure method. The calculated electronic structure and in particular magnetic moments and energy gaps are discussed in reference to the earlier SIC results obtained within the linear muffin-tin orbital atomic sphere approximation band structure method, involving transformations between Bloch and Wannier representations, in order to solve the eigenvalue problem and calculate the SIC charge and potential. Since the KKR method can be easily extended to treat disordered alloys, by invoking the coherent potential approximation (CPA), in this paper we compare the CPA approach and supercell calculations to study the electronic structure of NiO with cation vacancies.
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171
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Gao CL, Ernst A, Fischer G, Hergert W, Bruno P, Wulfhekel W, Kirschner J. Spin wave dispersion on the nanometer scale. PHYSICAL REVIEW LETTERS 2008; 101:167201. [PMID: 18999706 DOI: 10.1103/physrevlett.101.167201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2008] [Indexed: 05/27/2023]
Abstract
Hot electrons injected into antiferromagnetic Mn layers from the tip of a low temperature scanning tunneling microscope have been used to determine the energies, lifetimes, and momenta of antiferromagnetic spin waves on the nanometer scale. The spin waves show a linear dispersion with a velocity of 160+/-10 meV A and lifetimes that scale linearly with energy in agreement with neutron scattering and theory. It is shown that the method is sensitive enough to detect the influence of surface anisotropies on the spin wave dispersion.
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172
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Ernst A. [Posttraumatic disorders in the cranio-mandibular system and the cervical spine]. HNO 2008; 56:1112-3. [PMID: 18830574 DOI: 10.1007/s00106-008-1809-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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173
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Basta D, Ernst A. Moderne Rehabilitation von Gleichgewichtsstörungen mit Hilfe von Neurofeedback-Trainingsverfahren. HNO 2008; 56:990-5. [DOI: 10.1007/s00106-008-1805-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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174
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Ernst A, Weydt P, Klein S, Sperfeld A, Kühnlein P, Riecker A, Gdynia H. Multifokale Myositis in Kombination mit lokalisierter Lipodystrophie: eine seltene eigenständige Krankheitsentität? AKTUELLE NEUROLOGIE 2008. [DOI: 10.1055/s-0028-1086710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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175
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Gao CL, Ernst A, Winkelmann A, Henk J, Wulfhekel W, Bruno P, Kirschner J. Noncollinear surface spin density by surface reconstruction in the alloy NiMn. PHYSICAL REVIEW LETTERS 2008; 100:237203. [PMID: 18643540 DOI: 10.1103/physrevlett.100.237203] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2008] [Indexed: 05/26/2023]
Abstract
At the (001) surface of the alloy Ni(50)Mn(50), a noncollinear spin density is observed in real space by spin-polarized scanning tunneling microscopy. The spin density of individual atoms also varies in both size and direction as a function of bias voltage, indicating a noncollinearity in the energy domain. The noncollinearity is driven by a surface reconstruction which breaks the otherwise high surface symmetry. First-principles electronic-structure calculations support the experimental observations and evidence the interplay of reconstruction and spin-orbit coupling.
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