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Heidt V, Hermes-Moll K, Blaschke K, Lappe V, Ihle P, Schubert I, Baumann W. Anticancer therapy at the end of life of breast, prostate, and colorectal cancer patients. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy295.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Brunner H, Weißhaar G, Friebolin H, Baumann W, Mann H, Sieberth H, Opferkuch H. Isolation of Unusually Composed Sialyl-Compounds from Hemofiltrate. Int J Artif Organs 2018. [DOI: 10.1177/039139888901201204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Sialyl compounds are essential components of various biological fluids but relatively little is known about their occurrence in the extracellular fluid of patients with end-stage renal disease. As we have developed a macropreparative method for concentrating and desalting a wide range of fractions from diluted biological fluids we have been able to isolate and identify 5 sialooligosaccharides, 3 sialosugarphosphates, 2 monosialoglycopeptides and 1 disialoglycopeptide. The structures have been elucidated predominantly by one and two-dimensional NMR spectroscopy, enzymatic degradation and FAB mass spectrometry. The accumulation of these compounds in uremic sera may be of particular interest as they may interact in the molecular biology of diseases typically associated with the uremic state, e.g., immune deficiency, neurological disorders, receptor binding abnormalities, complement system disturbances and cell membrane alterations.
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Affiliation(s)
- H. Brunner
- Abteilung Innere Medizin II der RWTH Aachen, Heidelberg - FRG
| | - G. Weißhaar
- Organisch-Chem. Institut der Universität Heidelberg, Heidelberg - FRG
| | - H. Friebolin
- Organisch-Chem. Institut der Universität Heidelberg, Heidelberg - FRG
| | - W. Baumann
- Organisch-Chem. Institut der Universität Heidelberg, Heidelberg - FRG
| | - H. Mann
- Abteilung Innere Medizin II der RWTH Aachen, Heidelberg - FRG
| | - H.G. Sieberth
- Abteilung Innere Medizin II der RWTH Aachen, Heidelberg - FRG
| | - H.J. Opferkuch
- Zentrale Arbeitsgruppe Spektroskopie, Deutsches Krebsforschungszentrum, Heidelberg - FRG
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Shajahan-Haq AN, Demas DM, Clarke R, Baumann WT. Abstract P4-08-03: Mathematical modeling of the unfolded protein response pathway in breast cancer cells. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p4-08-03] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Over 70% of all breast cancers are estrogen receptor positive (ER+) and are treated with endocrine therapies such as aromatase inhibitors or ER-disruptors as part of the standard of care. However, endocrine resistance remains a major clinical challenge for the successful treatment of this disease. ER+ breast cancer cells can escape endocrine therapy-mediated cell death through adaptations in the unfolded protein response (UPR), an evolutionarily conserved cellular stress response pathway that is linked to many other pathways (autophagy, metabolism, anti-oxidant response). To better understand how the UPR pathway promotes endocrine resistance, we built a mathematical model from quantitative measurements of key UPR signaling molecules following treatment of ER+ MCF7 cells (endocrine sensitive, estrogen dependent) with dithiothreitol (DTT). DTT disrupts or prevents protein disulfide bonding and is a potent inducer of the UPR. The same measurements were also made in two MCF7-derived resistant cell lines: LCC1 (sensitive to ER-disruptors, estrogen independent) and LCC9 (resistant to ER-disruptors, estrogen independent). Determining the (minimal) changes to the MCF7 mathematical model needed to adequately capture the data from the resistant cell lines allows us to create specific hypotheses for how the UPR adapts to help produce resistance to endocrine therapies. These hypotheses, in turn, can lead to drug targets for reversing resistance.
Citation Format: Shajahan-Haq AN, Demas DM, Clarke R, Baumann WT. Mathematical modeling of the unfolded protein response pathway in breast cancer cells [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P4-08-03.
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Affiliation(s)
- AN Shajahan-Haq
- Georgetown University Medical Center, Washington, WA; Virginia Tech, Blacksburg, VA
| | - DM Demas
- Georgetown University Medical Center, Washington, WA; Virginia Tech, Blacksburg, VA
| | - R Clarke
- Georgetown University Medical Center, Washington, WA; Virginia Tech, Blacksburg, VA
| | - WT Baumann
- Georgetown University Medical Center, Washington, WA; Virginia Tech, Blacksburg, VA
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Abstract
With Memoranda and other initiatives, the German Network for Health Service Research [Deutsches Netzwerk Versorgungsforschung e.V. (DNVF)] is fostering the methodological quality of care research studies for years. Compared to the standards of empirical research, questions concerning the role and function of theories, theoretical approaches and scientific principles have not been taken up on its own. Therefore, the DNVF e.V. has set up a working group in 2013, which was commissioned to prepare a memorandum on "theories in health care research". This now presented memorandum will primarily challenge scholars in health care services research to pay more attention to questions concerning the theoretical arsenal and the background assumptions in the research process. The foundation in the philosophy of science, the reference to normative principles and the theory-bases of the research process are addressed. Moreover, the memorandum will call on to advance the theorizing in health services research and to strengthen not empirical approaches, research on basic principles or studies with regard to normative sciences and to incorporate these relevant disciplines in health services research. Research structures and funding of health services research needs more open space for theoretical reflection and for self-observation of their own, multidisciplinary research processes.
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Affiliation(s)
- W Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und Onkologen - WINHO - GmbH, Köln
| | - E Farin
- Sektion Versorgungsforschung und Rehabilitationsforschung, Universitätsklinikum, Freiburg
| | | | - T Meyer
- Institut für Epidemiologie, Sozialmedizin und Gesundheitssystemforschung, Medizinische Hochschule, Hannover
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Han D, Joksch M, Klahn M, Spannenberg A, Drexler HJ, Baumann W, Jiao H, Knitsch R, Hansen MR, Eckert H, Beweries T. Iridium(iii) hydrido complexes for the catalytic dehydrogenation of hydrazine borane. Dalton Trans 2016; 45:17697-17704. [DOI: 10.1039/c6dt03068h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of POCOP iridium hydride complexes with differently substituted aryl backbones catalyse the selective release of one equivalent of hydrogen from hydrazine borane.
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Affiliation(s)
- D. Han
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - M. Joksch
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - M. Klahn
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - A. Spannenberg
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - H.-J. Drexler
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - W. Baumann
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - H. Jiao
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - R. Knitsch
- Westfälische Wilhelms-Universität Münster
- Institut für Physikalische Chemie
- 48149 Münster
- Germany
| | - M. R. Hansen
- Westfälische Wilhelms-Universität Münster
- Institut für Physikalische Chemie
- 48149 Münster
- Germany
| | - H. Eckert
- Westfälische Wilhelms-Universität Münster
- Institut für Physikalische Chemie
- 48149 Münster
- Germany
- Institute of Physics Sao Carlos
| | - T. Beweries
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
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Tavassoly I, Parmar J, Shajahan-Haq AN, Clarke R, Baumann WT, Tyson JJ. Dynamic Modeling of the Interaction Between Autophagy and Apoptosis in Mammalian Cells. CPT Pharmacometrics Syst Pharmacol 2015. [PMID: 26225250 PMCID: PMC4429580 DOI: 10.1002/psp4.29] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Autophagy is a conserved biological stress response in mammalian cells that is responsible for clearing damaged proteins and organelles from the cytoplasm and recycling their contents via the lysosomal pathway. In cases of mild stress, autophagy acts as a survival mechanism, while in cases of severe stress cells may switch to programmed cell death. Understanding the decision process that moves a cell from autophagy to apoptosis is important since abnormal regulation of autophagy occurs in many diseases, including cancer. To integrate existing knowledge about this decision process into a rigorous, analytical framework, we built a mathematical model of cell fate decisions mediated by autophagy. Our dynamical model is consistent with existing quantitative measurements of autophagy and apoptosis in rat kidney proximal tubular cells responding to cisplatin-induced stress.
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Affiliation(s)
- I Tavassoly
- Graduate Program in Genetics, Bioinformatics and Computational Biology, Virginia Polytechnic Institute and State University Blacksburg, Virginia, USA
| | - J Parmar
- Department of Biological Sciences, Virginia Polytechnic Institute and State University Blacksburg, Virginia, USA
| | - A N Shajahan-Haq
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center Washington, DC, USA
| | - R Clarke
- Lombardi Comprehensive Cancer Center, Georgetown University Medical Center Washington, DC, USA
| | - W T Baumann
- Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University Blacksburg, Virginia, USA
| | - J J Tyson
- Department of Biological Sciences, Virginia Polytechnic Institute and State University Blacksburg, Virginia, USA
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Gloede TD, Ernstmann N, Baumann W, Groß SE, Ansmann L, Nitzsche A, Neumann M, Wirtz M, Schmitz S, Schulz-Nieswandt F, Pfaff H. [Turnover of Non-medical Staff in Outpatient Oncology Practices: Is Building Social Capital a Solution?]. Gesundheitswesen 2014; 77:875-80. [PMID: 25197788 DOI: 10.1055/s-0034-1384565] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
STUDY AIM While a lot is known about potential and actual turnover of non-medical hospital staff, only few data exist for the outpatient setting. In addition, little is known about actual instruments which leaders can use to influence staff turnover in physician practices. In the literature, the social capital of an organisation, which means the amount of trust, common values and reciprocal behaviour in the organisation, has been discussed as a possible field of action. In the present study, staff turnover as perceived by outpatient haematologists and oncologists is presented and analysed as to whether social capital is associated with that staff turnover. In conclusion, measures to increase the social capital of a practice are presented. METHODS The present study is based on data gathered in a questionnaire-based survey with members of the Professional Organisation of -Office-Based Haematologists and Oncologists (N=551). The social capital of the practice was captured from the haematologists and oncologists using an existing and validated scale. To analyse the impact of the practice's social capital on staff turnover, as perceived by the physicians, bivariate correlations and linear regression analyses were calculated. RESULTS In total, 152 haematologists and oncologists participated in the study which represents a response rate of 28%. In the regression analyses, social capital appears as a significant and strong predictor of staff turnover (beta=-0.34; p<0.001). CONCLUSIONS Building social capital within the practice may be an important contribution to reducing staff turnover although the underlying study design does not allow for drawing causal conclusions regarding this relationship. To create social capital in their practice, outpatient physicians may apply measures that facilitate social interaction among staff, foster trust and facilitate cooperation. Such measures may already be applied when hiring and training new staff, but also continuously when leading employees and when organising work tasks, e.g., by establishing regular team meetings.
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Affiliation(s)
- T D Gloede
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
| | - N Ernstmann
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
| | - W Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und -Onkologen (WINHO), Köln
| | - S E Groß
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
| | - L Ansmann
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
| | - A Nitzsche
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
| | - M Neumann
- Universität Witten/Herdecke, Fakultät für Gesundheit, Institut für -Integrative Medizin, Witten
| | - M Wirtz
- Institut für Psychologie, Pädagogische Hochschule Freiburg
| | - S Schmitz
- Berufsverband der Niedergelassenen Hämatologen und Onkologen in Deutschland e. V., Köln
| | | | - H Pfaff
- IMVR - Institut für Medizinsoziologie, Versorgungsforschung und -Rehabilitationswissenschaft der Humanwissenschaftlichen Fakultät und der Medizinischen Fakultät der Universität zu Köln, Köln
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Lang IM, Vollert F, Hauser M, Baumann W, Paur HR, Seifert H. Freisetzung von Nanopartikeln bei thermischen Prozessen - Stabilität von Nanopartikel-Agglomeraten in Flammen. CHEM-ING-TECH 2014. [DOI: 10.1002/cite.201450492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Detzer N, Baumann W, Schwager B, Fröhling JC, Brittinger C. Synthesis and Spectroscopic Properties of Some Compounds Related to Benzenamine-4-(9-anthryl)-N,N-dimethyl [ADMA]. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1987-0409] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The synthesis of several compounds related to ADMA are described in detail. These compounds are characterized by their mass, NMR, and IR-spectra. In addition, the solvent dependent shift of the fluorescence as well as the effect of an electric field on the fluorescence have been measured. The results are in agreement with a two-state model assuming the simultaneous fluorescence from a weakly polar and a highly polar state with dipole moment μ. μ2/a3 (a is Onsager’s radius) has been determined from both effects. The results are in good agreement with an excited state dipole moment of about 60 • 10-30Cm, in the polar state.
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Affiliation(s)
- N. Detzer
- Institute of Physical Chemistry, University of Mainz, D-6500 Mainz, West Germany
| | - W. Baumann
- Institute of Physical Chemistry, University of Mainz, D-6500 Mainz, West Germany
| | - B. Schwager
- Institute of Physical Chemistry, University of Mainz, D-6500 Mainz, West Germany
| | - J.-C. Fröhling
- Institute of Physical Chemistry, University of Mainz, D-6500 Mainz, West Germany
| | - C. Brittinger
- Institute of Physical Chemistry, University of Mainz, D-6500 Mainz, West Germany
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Brittinger C, Maiti AK, Baumann W, Detzer N. Excited States Dipole Moments and Fluorescence Behaviour of Some Derivatives of Dimethylaminobenzonitrile. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/zna-1990-0708] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Two sterically hindered derivatives of dimethylaminobenzonitrile (DMCA) have been synthesized and the dipole moment of their fluorescent excited state has been determined in differently polar solvents. Its value increases with solvent polarity up to a limiting value of (50 + 2.5) • 10-30 Cm. The results are discussed with reference to the twisted intramolecular charge transfer (TICT) state formation in the class of molecules related to DMCA.
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Affiliation(s)
- C. Brittinger
- Institute of Physical Chemistry, University of Mainz, Mainz, West Germany
| | - A. K. Maiti
- Institute of Physical Chemistry, University of Mainz, Mainz, West Germany
| | - W. Baumann
- Institute of Physical Chemistry, University of Mainz, Mainz, West Germany
| | - N. Detzer
- Institute of Physical Chemistry, University of Mainz, Mainz, West Germany
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Groß S, Ernstmann N, Jung J, Karbach U, Ansmann L, Gloede T, Pfaff H, Wirtz M, Baumann W, Schmitz S, Osburg S, Neumann M. Can a stressed oncologist be good in a consultation? A qualitative study on the oncologists' perception. Eur J Cancer Care (Engl) 2014; 23:594-606. [DOI: 10.1111/ecc.12199] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2014] [Indexed: 12/19/2022]
Affiliation(s)
- S.E. Groß
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - N. Ernstmann
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - J. Jung
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - U. Karbach
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - L. Ansmann
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - T.D. Gloede
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - H. Pfaff
- Institute for Medical Sociology, Health Services Research and Rehabilitation Science University of Cologne; Faculty of Human Sciences and Faculty of Medicine (IMVR); University of Cologne; Cologne Germany
| | - M. Wirtz
- Department for Research Methodology; University of Education; Freiburg Germany
| | - W. Baumann
- Scientific Institute of Office-Based Haematologists and Oncologists (WINHO); Cologne Germany
| | - S. Schmitz
- Professional Organization of Office-Based Haematologists and Oncologists e.V. (BNHO); Cologne Germany
| | - S. Osburg
- Scientific Institute of Office-Based Haematologists and Oncologists (WINHO); Cologne Germany
| | - M. Neumann
- Faculty of Health; School of Medicine; Witten/Herdecke University; Herdecke Germany
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Abstract
PURPOSE After testing the psychometric properties of a new questionnaire that measures patient preferences for patient-physician communication (KOPRA questionnaire), the communication preferences of cancer patients were described. In order to do this, the preferences were differentiated according to sociodemographic subgroups and a comparison was made to the preferences of patients with chronic back pain and chronic ischaemic heart disease. METHODS N=1,635 patients from 31 medical oncology practices were surveyed. For the KOPRA questionnaire, reliability, unidimensionality, and fit to the Rasch model were tested. Hierarchical models were used to conduct subgroup analyses and comparisons with other diseases. RESULTS The psychometric properties of the KOPRA are satisfactory to good. For patients, the 4 communication domains (patient participation and patient orientation, effective and open communication, emotionally supportive communication, communication about personal circumstances) measured by the KOPRA questionnaire are equally important. Women generally have higher expectations of the physician's communicative behaviour. Affective communication is considerably more important for cancer patients than for back pain or cardiac patients. CONCLUSION The KOPRA questionnaire is well suited for examining the communication preferences of cancer patients. In general, physician behaviour associated with high scores in all 4 KOPRA dimensions is optimal. Especially in cases where the 4 communication aspects conflict with each other, the physician's communication style should be individualised.
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Affiliation(s)
- Erik Farin
- Qualitätsmanagement und Sozialmedizin, Universitätsklinikum Freiburg, Freiburg
| | - W Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und Onkologen-WINHO-GmbH, Köln
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Riese C, Borges U, Baumann W. Intersektoriale Koordination in der ambulanten Onkologie in Deutschland. Gesundheitswesen 2013. [DOI: 10.1055/s-0033-1354170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Groß SE, Ernstmann N, Ansmann L, Gloede TD, Jung J, Pfaff H, Wirtz M, Baumann W, Nitzsche A, Neumann M. Der behandelnde Onkologe im Erstgespräch und die Progredienzangst der Patienten. Gesundheitswesen 2013. [DOI: 10.1055/s-0033-1354091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Riese C, Baumann W, Walawgo T. Eine Untersuchung zum Kommunikationsverhalten niedergelassener Hämatologen und Onkologen. Dtsch Med Wochenschr 2012. [DOI: 10.1055/s-0032-1323438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Osburg S, Weiß B, Brandner S, Baumann W, Schmitz S. Qualität der Kooperation von niedergelassenen Hämatologen/Onkologen und hausärztlich tätigen Ärzten. Dtsch Med Wochenschr 2012. [DOI: 10.1055/s-0032-1323405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Diener SE, Neumann M, Pfaff H, Wirtz M, Baumann W, Ernstmann N. Aufbau von Vertrauen durch die Arzt-Patient-Kommunikation: Die Sicht der Onkologen. Dtsch Med Wochenschr 2012. [DOI: 10.1055/s-0032-1323217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Buschmann-Maiworm R, Baumann W, Zimmermann A, Schmitz S, Kleeberg U. Feasibility Analysis of the Winho Indicators for Outpatient Care in Oncology. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)33954-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Friedmann A, Cismak A, Tautorat C, Koester PJ, Baumann W, Held J, Gaspar J, Ruther P, Paul O, Heilmann A. FIB preparation and SEM investigations for three-dimensional analysis of cell cultures on microneedle arrays. Scanning 2012; 34:221-229. [PMID: 22076793 DOI: 10.1002/sca.20297] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 09/23/2011] [Indexed: 05/31/2023]
Abstract
We report the investigation of the interfaces between microneedle arrays and cell cultures in patch-on-chip systems by using Focused Ion Beam (FIB) preparation and Scanning Electron Microscopy (SEM). First, FIB preparations of micro chips are made to determine the size and shape of the designed microneedles. In this essay, we investigate the cell-substrate interaction, especially the cell adhesion, and the microneedle's potential cell penetration. For this purpose, cross-sectional preparation of these hard/soft hybrid structures is performed by the FIB technology. By applying the FIB technology followed by high-resolution imaging with SEM, new insights into the cell-substrate interface can be received. One can clearly distinguish between cells that are only in contact with microneedles and cells that are penetrated by microneedles. A stack of slice images is collected by the application of the slice-and-view setup during FIB preparation and is used for three-dimensional reconstruction of cells and micro-needles.
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Affiliation(s)
- A Friedmann
- Fraunhofer Institute for Mechanics of Materials IWM, Halle (Saale), Germany.
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Panas A, Marquardt C, Nalcaci O, Bockhorn H, Baumann W, Paur HR, Mülhopt S, Diabaté S, Weiss C. Screening of different metal oxide nanoparticles reveals selective toxicity and inflammatory potential of silica nanoparticles in lung epithelial cells and macrophages. Nanotoxicology 2012; 7:259-73. [PMID: 22276741 DOI: 10.3109/17435390.2011.652206] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In cell culture studies, foetal calf serum (FCS) comprising numerous different proteins is added, which might coat the surface of engineered nanomaterials (ENMs) and thus could profoundly alter their biological activities. In this study, a panel of industrially most relevant metal oxide nanoparticles (NPs) was screened for toxic effects in A549 lung epithelial cells and RAW264.7 macrophages in the presence and absence of FCS. In medium without FCS amorphous SiO2-NPs were the most cytotoxic NPs and induced a significant pro-inflammatory response in both cell types. An increased anti-oxidative response after exposure to SiO2-NPs was, however, only observed in RAW264.7 macrophages. Furthermore, pre-coating of SiO2-NPs with FCS proteins or simply bovine serum albumin abrogated responses in A549 lung epithelial cells. Thus, the protein corona bound to the surface of SiO2-NPs suppresses their biological effects, an issue which needs to be more carefully considered for in vitro-in vivo extrapolations.
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Affiliation(s)
- A Panas
- Karlsruhe Institute of Technology, Campus North, Institute of Toxicology and Genetics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Burlakov VV, Bogdanov VS, Lyssenko KA, Spannenberg A, Petrovskii PV, Baumann W, Arndt P, Minacheva MK, Strunin BN, Rosenthal U, Shur VB. Interaction of the Negishi reagent Cp2ZrBun 2 with 1,4-bis(tert-butyl)butadiyne. Russ Chem Bull 2012. [DOI: 10.1007/s11172-012-0023-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Buehler SM, Stubbe M, Gimsa U, Baumann W, Gimsa J. A decrease of intracellular ATP is compensated by increased respiration and acidification at sub-lethal parathion concentrations in murine embryonic neuronal cells: measurements in metabolic cell-culture chips. Toxicol Lett 2011; 207:182-90. [PMID: 21939746 DOI: 10.1016/j.toxlet.2011.09.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 09/05/2011] [Accepted: 09/06/2011] [Indexed: 01/09/2023]
Abstract
We present a label-free in vitro method for testing the toxic potentials of chemical substances using primary neuronal cells. The cells were prepared from 16-day-old NMRI mouse embryos and cultured on silicon chips (www.bionas.de) under the influence of different parathion concentrations with sensors for respiration (Clark-type oxygen electrodes), acidification (pH-ISFETs) and cell adhesion (interdigitated electrode structures, IDES). After 12 days in vitro, the sensor readouts were simultaneously recorded for 350 min in the presence of parathion applying a serial 1:3 dilution. The parathion-dependent data was fitted by logistic functions. IC(50) values of approximately 105 μM, 65 μM, and 54 μM were found for respiration, acidification, and adhesion, respectively. An IC(50) value of approximately 36 μM was determined from the intracellular ATP-levels of cells, which were detected by an ATP-luminescence assay using micro-well plates. While the intracellular ATP level and cell adhesion showed no deviation from a simple logistic decay, increases of approximately 29% in the respiration and 15% in the acidification rates above the control values were found at low parathion concentrations, indicating hormesis. These increases could be fitted by a modified logistic function. We believe that the label-free, continuous, multi-parametric monitoring of cell-metabolic processes may have applications in systems-biology and biomedical research, as well as in environmental monitoring. The parallel characterization of IC(50) values and hormetic effects may provide new insights into the metabolic mechanisms of toxic challenges to the cell.
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Affiliation(s)
- S M Buehler
- University of Rostock, Chair of Biophysics, Rostock, Germany
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Baumann W, Buschmann-Maiworm R, Farin-Glattacker E. Kommunikationspräferenzen und Lebensqualität von Patienten in onkologischen Schwerpunktpraxen. Gesundheitswesen 2011. [DOI: 10.1055/s-0031-1283398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Buschmann-Maiworm RE, Klein G, Baumann W, Lebahn H, Otremba BJ, Steinmetz T, Kleeberg UR, Schmitz S. Identification of 46 quality indicators for cancer care in office-based oncology practices in Germany. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e16514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Schwarze M, Milano-Brusco J, Strempel V, Hamerla T, Wille S, Fischer C, Baumann W, Arlt W, Schomäcker R. Rhodium catalyzed hydrogenation reactions in aqueous micellar systems as green solvents. RSC Adv 2011. [DOI: 10.1039/c1ra00397f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Müller D, Augustin M, Banik N, Baumann W, Bestehorn K, Kieschke J, Lefering R, Maier B, Mathis S, Rustenbach S, Sauerland S, Semler S, Stausberg J, Sturm H, Unger C, Neugebauer E. Memorandum Register für die Versorgungsforschung *. Gesundheitswesen 2010. [DOI: 10.1055/s-0030-1268484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- D. Müller
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - M. Augustin
- Deutsche Dermatologische Gesellschaft (DDG), Berufsverband der Deutschen Dermatologen, Universitätsklinikum Hamburg-Eppendorf
| | - N. Banik
- GlaxoSmithKline GmbH & Co. KG, München
| | - W. Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und Onkologen GmbH (WINHO), Köln
| | | | - J. Kieschke
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - R. Lefering
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - B. Maier
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - S. Mathis
- Ludwig Boltzmann Institut Health Technology Assessment, Wien
| | - S. Rustenbach
- Universitätsklinikum Hamburg-Eppendorf, Institut für Versorgungsforschung in der Dermatologie und bei Pflegeberufen, Competenzzentrum Versorgungsforschung in der Dermatologie (CVderm)
| | - S. Sauerland
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - S. Semler
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin
| | - J. Stausberg
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin
| | - H. Sturm
- Südwestdeutsches Tumorzentrum, Universitätsklinikum Tübingen; Schwenninger BKK, Schwenningen
| | - C. Unger
- Epidemiologisches Krebsregister Niedersachsen, Hannover
| | - E. Neugebauer
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
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Müller D, Augustin M, Banik N, Baumann W, Bestehorn K, Kieschke J, Lefering R, Maier B, Mathis S, Rustenbach S, Sauerland S, Semler S, Stausberg J, Sturm H, Unger C, Neugebauer E. Memorandum Register für die Versorgungsforschung *. Gesundheitswesen 2010. [DOI: 10.1055/s-0030-1267233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- D. Müller
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - M. Augustin
- Deutsche Dermatologische Gesellschaft (DDG), Berufsverband der Deutschen Dermatologen, Universitätsklinikum Hamburg-Eppendorf
| | - N. Banik
- GlaxoSmithKline GmbH & Co. KG, München
| | - W. Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und Onkologen GmbH (WINHO), Köln
| | | | - J. Kieschke
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - R. Lefering
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - B. Maier
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - S. Mathis
- Ludwig Boltzmann Institut Health Technology Assessment, Wien
| | - S. Rustenbach
- Deutsche Dermatologische Gesellschaft (DDG), Berufsverband der Deutschen Dermatologen, Universitätsklinikum Hamburg-Eppendorf
| | - S. Sauerland
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - S. Semler
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin
| | - J. Stausberg
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin
| | - H. Sturm
- Südwestdeutsches Tumorzentrum, Universitätsklinikum Tübingen; Schwenninger BKK, Schwenningen
| | - C. Unger
- Epidemiologisches Krebsregister Niedersachsen, Hannover
| | - E. Neugebauer
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
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Kornmann M, Staib L, Wiegel T, Kreuser ED, Kron M, Baumann W, Henne-Bruns D, Link KH. Adjuvant chemoradiotherapy of advanced resectable rectal cancer: results of a randomised trial comparing modulation of 5-fluorouracil with folinic acid or with interferon-α. Br J Cancer 2010; 103:1163-72. [PMID: 20877353 PMCID: PMC2967051 DOI: 10.1038/sj.bjc.6605871] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Background: Standard adjuvant chemoradiotherapy of rectal cancer still consists of 5-fluorouracil (5-FU) only. Its cytotoxicity is enhanced by folinic acid (FA) and interferon-α (INFα). In this trial, the effects of FA and IFNα on adjuvant 5-FU chemoradiotherapy in locally advanced rectal cancer were investigated. Methods: Patients with R0-resected rectal cancer (UICC stage II and III) were stratified and randomised to a 12-month adjuvant chemoradiotherapy with 5-FU, 5-FU+FA, or 5-FU+IFNα. All patients received levamisol and local irradiation with 50.4 Gy. Results: Median follow-up was 4.9 years (n=796). Toxicities (WHO III+IV) were observed in 32, 28, and 58% of patients receiving 5-FU, 5-FU+FA, and 5-FU+IFNα, respectively. No differences between the groups were observed for local or distant recurrence. Five-year overall survival (OS) rates were 60.3% (95% confidence interval (CI): 54.3–65.8), 60.4% (54.4–65.8), and 59.9% (53.0–66.1) for 5-FU, 5-FU+FA, and 5-FU+IFNα, respectively. A subgroup analysis in stage II (pT3/4pN0) disease (n=271) revealed that the addition of FA tended to reduce the 5-year local recurrence (LR) rate by 55% and increase recurrence-free survival and OS rates by 12 and 13%, respectively, relative to 5-FU alone. Conclusions: Interferon-α cannot be recommended for adjuvant chemoradiotherapy of rectal cancer. In UICC stage II disease, the addition of FA tended to lower LR and increased survival. The addition of FA to 5-FU may be an effective option for adjuvant chemoradiotherapy of UICC stage II rectal cancer.
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Affiliation(s)
- M Kornmann
- Department of General, Visceral, and Transplantation Surgery, University of Ulm, Steinhoevelstrasse, Ulm 89075, Germany.
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Müller D, Augustin M, Banik N, Baumann W, Bestehorn K, Kieschke J, Lefering R, Maier B, Mathis S, Rustenbach SJ, Sauerland S, Semler SC, Stausberg J, Sturm H, Unger C, Neugebauer EAM. [Memorandum registry for health services research]. Gesundheitswesen 2010; 72:824-39. [PMID: 20872343 DOI: 10.1055/s-0030-1263132] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
On August 30, 2010, the German Network for Health Services Research [Deutsches Netzwerk Versorgungsforschung e. V. (DNVF e. V.)] approved the Memorandum III "Methods for Health Services Research", supported by their member societies mentioned as authors and published in this Journal [Gesundheitswesen 2010; 72: 739-748]. Registries in Health Services Research vary in their aims and research questions as well as in their designs, methods of data collection, and statistical analyses. This paper aims to provide both a methodological guideline for developers to ensure a high quality of a planned registry and, to provide an instrument for users of data from registries to assess their overall quality. First, the paper provides a definition of registries and presents an overview of objectives in Health Services Research where registries can be useful. Second, several areas of methodological importance for the development of registries are presented. This includes the different phases of a registry (i. e., conceptual and preliminary design, implementation), technical organisation of a registry, statistical analysis, reporting of results, data protection, and ethical/legal aspects. From these areas, several criteria are deduced to allow the assessment of the quality of a registry. Finally, a checklist to assess a registry's quality is presented.
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Affiliation(s)
- D Müller
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - M Augustin
- Deutsche Dermatologische Gesellschaft (DDG), Berufsverband der Deutschen Dermatologen, Universitätsklinikum Hamburg-Eppendorf
| | - N Banik
- GlaxoSmithKline GmbH & Co. KG, München
| | - W Baumann
- Wissenschaftliches Institut der Niedergelassenen Hämatologen und Onkologen GmbH (WINHO), Köln
| | | | - J Kieschke
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - R Lefering
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - B Maier
- Berliner Herzinfarktregister, Innovationszentrum Technologien für Gesundheit und Ernährung, TU Berlin
| | - S Mathis
- Ludwig Boltzmann Institut Health Technology Assessment, Wien
| | | | - S Sauerland
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
| | - S C Semler
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin
| | - J Stausberg
- Telematikplattform für Medizinische Forschungsnetze e. V. (TMF), Berlin,Institut für Medizinische Informationsverarbeitung, Biometrie und Epidemiologie, Ludwig-Maximilians-Universität, München
| | - H Sturm
- Südwestdeutsches Tumorzentrum, Universitätsklinikum Tübingen; Schwenninger BKK, Schwenningen
| | - C Unger
- Epidemiologisches Krebsregister Niedersachsen, Hannover,Niedersächsisches Landesgesundheitsamt, Hannover
| | - E A M Neugebauer
- Institut für Forschung in der Operativen Medizin, Universität Witten-Herdecke
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Wohlschlögel M, Baumann W, Welzel U, Mittemeijer EJ. Determination of depth gradients of grain interaction and stress in Cu thin films. J Appl Crystallogr 2008. [DOI: 10.1107/s0021889808031026] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Grain-interaction and residual stress depth gradients in a sputter-deposited Cu thin film (thickness 4 µm) were determined by employing X-ray diffraction stress measurements at constant information depths in the range between 200 and about 1500 nm. A novel procedure, which allows the determination of an effective grain-interaction parameter on the basis of thef(ψ,hkl) method and the Voigt and Reuss models of elastic grain interaction, was used. The range of accessible penetration depths was maximized by employing different photon energies using a laboratory diffractometer with Cu Kα radiation and a diffractometer at a synchrotron beamline. The variation of grain interaction with depth could be successfully related to the microstructure of the specimen. The tensile residual stress in the film parallel to its surface decreases with decreasing depth. By measuring the lattice spacing for several reflections at one penetration depth with two different photon energies (i.e.using small and large incident beam angles) it was found that the surface roughness of the specimen counteracts the effect of beam refraction to some degree. As a consequence, irrespective of whether a refraction correction is applied or neglected for the low-incidence angle measurement, erroneous results are obtained for lattice spacings derived from reflections at small incidence angles; reliable grain-interaction and stress analysis requires measurements at high incidence angle.
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Kornmann M, Formentini A, Ette C, Henne-Bruns D, Kron M, Sander S, Baumann W, Kreuser ED, Staib L, Link KH. Prognostic factors influencing the survival of patients with colon cancer receiving adjuvant 5-FU treatment. Eur J Surg Oncol 2008; 34:1316-21. [PMID: 18313881 DOI: 10.1016/j.ejso.2008.01.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2007] [Accepted: 01/18/2008] [Indexed: 01/15/2023] Open
Abstract
AIM Adjuvant chemotherapy is recommended for stage III colon cancer. The aim of this study was to identify important prognostic factors among patients with colon cancer receiving adjuvant 5-FU-based treatment. METHODS Data sets of 855 colon cancer patients treated between 1992 and 1999 within a multicenter adjuvant trial comparing 5-FU modulation with folinic acid or interfereron-alpha were examined. Backward elimination in a proportional hazards model was used to identify prognostically relevant clinical and pathological factors. RESULTS Tumor recurrence (p<0.001), duration of adjuvant treatment (p<0.001), tumor substage (p=0.004), age (p=0.005), grading (p=0.016), treatment-related toxicity (p=0.021), and treatment (p=0.031) were identified in descending order of importance as prognostic factors for overall survival. CONCLUSIONS Adjuvant 5-FU-based treatment should be performed for at least 6months with a stepwise adjustment of 5-FU doses until toxicity >WHO II. Substages should be reported separately and used for stratification in future trials due to their broad variation in outcome. In the future, this may result in adjuvant treatment of stage III colon cancer adjusted for the risk of substages.
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Affiliation(s)
- M Kornmann
- Clinic of General, Visceral, and Transplantation Surgery, University of Ulm, Steinhoevelstrasse 9, 89075 Ulm, Germany.
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Nemkovich N, Baumann W. Molecular Stark-effect spectroscopy of Prodan and Laurdan in different solvents and electric dipole moments in their equilibrated ground and Franck–Condon excited state. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2006.05.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Rensch R, Baumann W, Friebolin H. 1H-NMR-Untersuchungen an Sialinsäuren, V1N-Acetyl-α-D-Neuraminsäure: Chemische Verschiebungen und Kopplungskonstanten; Konfiguration und Konformation in Lösung. J Carbohydr Chem 2006. [DOI: 10.1080/07328308308057888] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Baumann W, Thekedar B, Paur HR, Seifert H, Hauser M. Parameteruntersuchung zur SiO2-Nanopartikelproduktion durch Mikrowellenplasmasynthese. CHEM-ING-TECH 2006. [DOI: 10.1002/cite.200650026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Rodrigues SV, Viana LM, Baumann W. UV/Vis spectra and solubility of some naphthoquinones, and the extraction behavior of plumbagin from Plumbago scandens roots in supercritical CO2. Anal Bioanal Chem 2006; 385:895-900. [PMID: 16791570 DOI: 10.1007/s00216-006-0502-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2006] [Revised: 04/08/2006] [Accepted: 04/21/2006] [Indexed: 10/24/2022]
Abstract
The solubility of 1,4-naphthoquinone, plumbagin, lawsone, and juglone in supercritical carbon dioxide was determined spectroscopically at 40 degrees C, and in the pressure range 8-18 MPa. Their solubilities at 12 MPa were between 0.3 and 10 g L(-1). Plumbagin from Plumbago scandens L. roots was extracted at 40 degrees C and 20 MPa. The extracted plumbagin mass fraction was up to 0.2% in fresh roots but down to about 0.006% in aged roots. n-Hexane and chloroform extraction of such aged roots indicates that the older and dryer the roots are, the stronger they bind plumbagin. Reversed-phase HPLC indicated a relatively pure plumbagin extract with supercritical carbon dioxide.
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Affiliation(s)
- S V Rodrigues
- Departamento de Química Analítica, Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista S/N, 24020-150 Niterói, Brazil.
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Redlinger R, Baumann W, Breitung W, Dorofeev S, Gulden W, Kuznetsov M, Lelyakin A, Necker G, Royl P, Singh RK, Travis J, Veser A. 3D-analysis of an ITER accident scenario. Fusion Engineering and Design 2005. [DOI: 10.1016/j.fusengdes.2005.06.207] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Holthues H, Pfeifer-Fukumura U, Sound I, Baumann W. Evaluation of the concept of heterology in a monoclonal antibody-based ELISA utilizing direct hapten linkage to polystyrene microtiter plates. J Immunol Methods 2005; 304:68-77. [PMID: 16111698 DOI: 10.1016/j.jim.2005.06.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2005] [Revised: 06/06/2005] [Accepted: 06/20/2005] [Indexed: 11/27/2022]
Abstract
A series of new heterologous haptens has been synthesized and used as coating haptens in an antigen-immobilized immunoassay with a monoclonal antibody against atrazine. Coating was achieved by covalently linking the different haptens to a glutaraldehyde network directly bound to the polystyrene surface of a standard 96-well microtiter plate. With the assay designed in the antigen-immobilized format with direct chemical linkage of the hapten to the solid polystyrene surface well-defined hapten densities were achieved in all experiments. The results of different experiments with different coating haptens were comparable. Using different heterologous haptens it appears that the concept of heterology is applicable in this case and can be used to enhance the sensitivity of an immunoassay in the coating-hapten format.
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Affiliation(s)
- H Holthues
- Institute of Physical Chemistry, University of Mainz, Jakob Welder-Weg 11, D 55128 Mainz, Germany
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Paur HR, Baumann W, Mätzing H, Seifert H. Formation of nanoparticles in flames; measurement by particle mass spectrometry and numerical simulation. Nanotechnology 2005; 16:S354-S361. [PMID: 21727452 DOI: 10.1088/0957-4484/16/7/007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The size distributions of nanoparticles in flames are measured using a novel particle mass spectrometer (PMS), which is developed for the size range between 0.3 and 50 nm and for number concentrations between 10(9) and 10(13). Using this instrument the particles are sampled without prior dilution from the flame into a molecular beam. The charged nanoparticles are then deflected by an electric field, to determine the mass according to the time-of-flight principle. The PMS is installed in a low pressure combustion chamber operated at 30 mbar. Measurements are made on primary soot particles and iron oxide particles in a laminar, premixed acetylene/oxygen flame. The soot particles increase in size as a function of the height above the burner and the C/O ratio from 2 up to 10 nm. Iron oxide particles of 3-5 nm are detected as a function of burner height. The soot particles form more rapidly than the iron oxide particles. A model calculation for the formation of silica and iron oxide in hydrogen/oxygen flames is developed, based on previously published reaction mechanisms. On adding a mono-disperse particle coagulation scheme, the time history of the particle number concentration and the particle size is calculated. In agreement with experimental data, the calculations show that iron oxide particles are formed more slowly than silica particles.
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Affiliation(s)
- H-R Paur
- Forschungszentrum Karlsruhe GmbH, Institut für Technische Chemie, Bereich Thermische Abfallbehandlung, Postfach 3640, D-76021 Karlsruhe, Germany
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Nemkovich NA, Pivovarenko VG, Baumann W, Rubinov AN, Sobchuk AN. Dipole Moments of 4?-Aminoflavonol Fluorescent Probes in Different Solvents. J Fluoresc 2005; 15:29-36. [PMID: 15711874 DOI: 10.1007/s10895-005-0210-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2004] [Accepted: 08/14/2004] [Indexed: 11/29/2022]
Abstract
Electrooptical absorption measurements (EOAM) were used to measure the dipole moments of the normal form of 4'-(dimethylamino)-3-hydroxyflavone (FME), and 4' N-(15-azacrown-5)-3-hydroxyflavone (FCR) in 1,4-dioxane, toluene, and cyclohexane. With these probes excited-state intramolecular proton transfer (ESIPT) takes place. For comparison, the dipole moments of 4'-(dimethylamino)-3-metoxyflavone (FME3ME), for which ESIPT is lacking, were measured, too. For all three probes the ground (micro(g)) and excited Franck-Condon state (micro(e)FC) electrical dipole moments are parallel to each other and also parallel to the transition dipole moment. The electrical dipole moments of FCR, FME, and FME3ME in their ground state have values within the range (12.0-17.7) x 10(-30) C m. Upon optical excitation, the dipole moments increase by (41.9-52.9) x 10(-30) C m. The value of the change of the dipole moment vector delta(a)micro with excitation to the Franck-Condon state and the value of the vector micro(e)FC for FCR and FME are practically independent on the solvent polarity. From this point of view and due to large values of the dipole moments FCR and FME are very promising probes for the investigation of the distribution of the local polarity in biological systems using site-selective excitation of the different sites. Our steady-state fluorescence studies on FME and FCR have demonstrated a high spectral sensitivity of the normal form to such solvent characteristics as polarity.
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Affiliation(s)
- N A Nemkovich
- Institute of Physical Chemistry, University of Mainz, Jakob Welder-Weg 11, 55099 Mainz, Germany.
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Mätzing H, Baumann W, Hauser M, Penkuhn K, Paur HR, Seifert H. Massenspektrometrie und Größenanalyse von elektrisch geladenen Rußpartikeln. CHEM-ING-TECH 2004. [DOI: 10.1002/cite.200490134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Viana L, Freitas M, Rodrigues S, Baumann W. Extraction of lapachol from Tabebuia avellanedae wood with supercritical CO2: an alternative to Soxhlet extraction? Braz J Chem Eng 2003. [DOI: 10.1590/s0104-66322003000300011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Burlakov V, Letov A, Arndt P, Baumann W, Spannenberg A, Fischer C, Strunkina L, Minacheva M, Vygodskii Y, Rosenthal U, Shur V. Zwitterionic titanoxanes {Cp[η5-C5H4B(C6F5)3]Ti}2O and {(η5-iPrC5H4)[η5-1,3-iPrC5H3B(C6F5)3]Ti}2O as catalysts for cationic ring-opening polymerization. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1381-1169(03)00023-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Sun H, Spannenberg Α, Burlakov VV, Baumann W, Arndt P, Rosenthal U. Crystal structure of dimeric bis(tetrahydroindenyl)-2-trimethylsilyl- 3-trìmetylsìloxacarbonyl-zìrconafuran-4-one, C56H80O8Si4Zr2. Z KRIST-NEW CRYST ST 2002. [DOI: 10.1524/ncrs.2002.217.1.237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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