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Watts C, Spillane A, Henderson MA, Cust A, Braithwaite J, Gyorki DE, Hong AM, Kelly JW, Long GV, Mar VJ, Menzies AM, Morton RL, Rapport F, Saw RPM, Schmid H, Scolyer RA, Smith AL, Winder A, Mann GJ. Sentinel lymph node biopsy rates in Victoria, 2018 and 2019. Med J Aust 2022. [DOI: 10.5694/mja2.51424] [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: 11/17/2022]
Affiliation(s)
- Caroline Watts
- Daffodil Centre University of Sydney and Cancer Council NSW Sydney NSW
- The Kirby Institute UNSW Sydney NSW
| | - Andrew Spillane
- Melanoma Institute Australia University of Sydney Sydney NSW
- Sydney Medical School University of Sydney Sydney NSW
- Royal North Shore Hospital Sydney NSW
- Mater Hospital Sydney NSW
| | - Michael A Henderson
- Peter MacCallum Cancer Centre Melbourne VIC
- The University of Melbourne Melbourne VIC
| | - Anne Cust
- Daffodil Centre University of Sydney and Cancer Council NSW Sydney NSW
- Melanoma Institute Australia University of Sydney Sydney NSW
| | - J Braithwaite
- Australian Institute of Health Innovation Macquarie University Sydney NSW
| | - DE Gyorki
- Peter MacCallum Cancer Centre Melbourne VIC
| | - AM Hong
- Melanoma Institute Australia University of Sydney Sydney NSW
| | - JW Kelly
- Victorian Melanoma Service Alfred Hospital Melbourne VIC
| | - GV Long
- Melanoma Institute Australia University of Sydney Sydney NSW
- Sydney Medical School University of Sydney Sydney NSW
- Royal North Shore Hospital Sydney NSW
- Mater Hospital Sydney NSW
| | - VJ Mar
- Victorian Melanoma Service Alfred Hospital Melbourne VIC
| | - AM Menzies
- Melanoma Institute Australia University of Sydney Sydney NSW
- Sydney Medical School University of Sydney Sydney NSW
- Royal North Shore Hospital Sydney NSW
- Mater Hospital Sydney NSW
| | - RL Morton
- Melanoma Institute Australia University of Sydney Sydney NSW
- NHMRC Clinical Trials Centre University of Sydney Sydney NSW
| | - F Rapport
- Australian Institute of Health Innovation Macquarie University Sydney NSW
| | - RPM Saw
- Melanoma Institute Australia University of Sydney Sydney NSW
- Sydney Medical School University of Sydney Sydney NSW
- Mater Hospital Sydney NSW
| | - H Schmid
- Daffodil Centre University of Sydney and Cancer Council NSW Sydney NSW
| | - RA Scolyer
- Melanoma Institute Australia University of Sydney Sydney NSW
- Sydney Medical School University of Sydney Sydney NSW
- Royal Prince Alfred Hospital and New South Wales Health Pathology Sydney NSW
| | - AL Smith
- Daffodil Centre University of Sydney and Cancer Council NSW Sydney NSW
| | - A Winder
- Melanoma Institute Australia University of Sydney Sydney NSW
| | - GJ Mann
- Melanoma Institute Australia University of Sydney Sydney NSW
- The John Curtin School of Medical Research Australian National University Canberra ACT
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Vuong K, Armstrong BK, Espinoza D, Hopper JL, Aitken JF, Giles GG, Schmid H, Mann GJ, Cust AE, McGeechan K. An independent external validation of melanoma risk prediction models using the Australian Melanoma Family Study. Br J Dermatol 2020; 184:957-960. [PMID: 33270216 DOI: 10.1111/bjd.19706] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 11/29/2020] [Accepted: 11/30/2020] [Indexed: 12/23/2022]
Affiliation(s)
- K Vuong
- School of Population Health, The University of New South Wales, Sydney, Australia
| | - B K Armstrong
- Cancer Epidemiology and Prevention Research (Sydney School of Public Health), The University of Sydney, Sydney, Australia
| | - D Espinoza
- Cancer Epidemiology and Prevention Research (Sydney School of Public Health), The University of Sydney, Sydney, Australia
| | - J L Hopper
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia
| | - J F Aitken
- Cancer Council Queensland, Brisbane, Australia
| | - G G Giles
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia.,Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia
| | - H Schmid
- Centre for Cancer Research (Westmead Institute for Medical Research), The University of Sydney, Sydney, Australia
| | - G J Mann
- Centre for Cancer Research (Westmead Institute for Medical Research), The University of Sydney, Sydney, Australia.,John Curtin School of Medical Research, Australian National University, Canberra, Australia.,Melanoma Institute Australia, The University of Sydney, Sydney, Australia
| | - A E Cust
- Cancer Epidemiology and Prevention Research (Sydney School of Public Health), The University of Sydney, Sydney, Australia.,Melanoma Institute Australia, The University of Sydney, Sydney, Australia
| | - K McGeechan
- Sydney School of Public Health, The University of Sydney, Sydney, Australia
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Lahr D, Assenmacher W, Schmid H, Kimizuka N, Kamai A, Tanaka Y, Miyakawa N, Mader W. In1-xGa1+xO3(ZnO)0.5: Synthesis, structure and cation distribution. J SOLID STATE CHEM 2020. [DOI: 10.1016/j.jssc.2020.121341] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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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Einhaus J, Pecher AC, Asteriti E, Schmid H, Secker KA, Duerr-Stoerzer S, Keppeler H, Klein R, Schneidawind C, Henes J, Schneidawind D. AB0029 INHIBITION OF EFFECTOR B CELLS BY IBRUTINIB IN SYSTEMIC SCLEROSIS. Ann Rheum Dis 2020. [DOI: 10.1136/annrheumdis-2020-eular.1791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Background:Systemic sclerosis (SSc) is a connective tissue disease with significant morbidity and mortality. Effective treatment is still missing, and clinical control of the disease remains challenging. In particular, the development of pulmonary and cardiac fibrosis and pulmonary hypertension are severe complications responsible for excessive mortality. Currently available treatment strategies – besides aggressive autologous stem cell transplantation which is an option only for selected patients – only alleviate symptoms and slow disease progression. Previous attempts of immunomodulating therapies addressing B cell pathology like rituximab and tocilizumab in SSc showed mixed efficacy1,2Objectives:Here, we investigated the therapeutic potential of ibrutinib, a Bruton’s tyrosine kinase (BTK) inhibitor used in B cell malignancies, to alter B cell pathology in SSc in anin vitromodel of autoimmunity.Methods:PBMCs and sorted B cells of 24 patients with SSc were used for functional testing after stimulation with hypomethylated DNA fragments (CpG) to induce an innate immune response. The effects of ibrutinib on cytokine production, autoantibody release and activation of the transcription factor NFκB were evaluated via multiplex cytokine assay, ELISA and flow cytometry.Results:Ibrutinib was able to reduce the production of the profibrotic hallmark cytokines IL-6 and TNF-α, which are mainly released by the effector B cell population, in response to TLR9-stimulation. Importantly, small doses of ibrutinib (0.1 µM) preserved the production of immunoregulatory IL-10 and IFN-γ while effectively inhibiting the cardinal cytokines of hyperactivated profibrotic effector B cells in SSc. Intracellular cytokine staining of IL-6 in B cell subsets further endorsed the potential of ibrutinib to inhibit B cells in a subset-specific manner, reducing IL-6+naïve B cells significantly but not IL-6+memory B cells. The subset specificity was abolished when high doses of ibrutinib (10 µM) were applied. In a flow cytometry analysis of phosphorylated NFκB, an important transcription factor in the induction of innate immune responses in B cells, significantly less activation was observed with ibrutinib treatment (0.1 µM). Higher doses of ibrutinib were unable to further reduce the abundance of pNFκB.Conclusion:Our data could pave the avenue for a clinical application of ibrutinib for patients with SSc as a novel treatment option for the underlying pathogenetic immune imbalance contributing to disease onset and progression.References:[1]Khanna, D.et al.Efficacy and Safety of Tocilizumab for the Treatment of Systemic Sclerosis: Results from a Phase 3 Randomized Controlled Trial [abstract]. Arthritis Rheumatol. 2018; 70 (suppl 10).[2]Jordan, S.et al.Effects and safety of rituximab in systemic sclerosis: an analysis from the European Scleroderma Trial and Research (EUSTAR) group.Ann. Rheum. Dis.74, 1188–1194 (2015).Disclosure of Interests:Jakob Einhaus: None declared, Ann-Christin Pecher: None declared, Elisa Asteriti: None declared, Hannes Schmid: None declared, Kathy-Ann Secker: None declared, Silke Duerr-Stoerzer: None declared, Hildegard Keppeler: None declared, Reinhild Klein: None declared, Corina Schneidawind: None declared, Jörg Henes Grant/research support from: Novartis, Roche-Chugai, Consultant of: Novartis, Roche, Celgene, Pfizer, Abbvie, Sanofi, Boehringer-Ingelheim,, Dominik Schneidawind: None declared
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Vuong K, Armstrong B, Drummond M, Hopper J, Barrett J, Davies J, Bishop D, Newton‐Bishop J, Aitken J, Giles G, Schmid H, Jenkins M, Mann G, McGeechan K, Cust A. Development of a new method to calculate individuals’ melanoma risk. Br J Dermatol 2020. [DOI: 10.1111/bjd.18992] [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: 11/29/2022]
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Vuong K, Armstrong B, Drummond M, Hopper J, Barrett J, Davies J, Bishop D, Newton‐Bishop J, Aitken J, Giles G, Schmid H, Jenkins M, Mann G, McGeechan K, Cust A. 开发一种新方法来计算个体的黑色素瘤风险. Br J Dermatol 2020. [DOI: 10.1111/bjd.19003] [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: 11/25/2022]
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Vuong K, Armstrong BK, Drummond M, Hopper JL, Barrett JH, Davies JR, Bishop DT, Newton-Bishop J, Aitken JF, Giles GG, Schmid H, Jenkins MA, Mann GJ, McGeechan K, Cust AE. Development and external validation study of a melanoma risk prediction model incorporating clinically assessed naevi and solar lentigines. Br J Dermatol 2020; 182:1262-1268. [PMID: 31378928 PMCID: PMC6997040 DOI: 10.1111/bjd.18411] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/31/2019] [Indexed: 12/21/2022]
Abstract
BACKGROUND Melanoma risk prediction models could be useful for matching preventive interventions to patients' risk. OBJECTIVES To develop and validate a model for incident first-primary cutaneous melanoma using clinically assessed risk factors. METHODS We used unconditional logistic regression with backward selection from the Australian Melanoma Family Study (461 cases and 329 controls) in which age, sex and city of recruitment were kept in each step, and we externally validated it using the Leeds Melanoma Case-Control Study (960 cases and 513 controls). Candidate predictors included clinically assessed whole-body naevi and solar lentigines, and self-assessed pigmentation phenotype, sun exposure, family history and history of keratinocyte cancer. We evaluated the predictive strength and discrimination of the model risk factors using odds per age- and sex-adjusted SD (OPERA) and the area under curve (AUC), and calibration using the Hosmer-Lemeshow test. RESULTS The final model included the number of naevi ≥ 2 mm in diameter on the whole body, solar lentigines on the upper back (a six-level scale), hair colour at age 18 years and personal history of keratinocyte cancer. Naevi was the strongest risk factor; the OPERA was 3·51 [95% confidence interval (CI) 2·71-4·54] in the Australian study and 2·56 (95% CI 2·23-2·95) in the Leeds study. The AUC was 0·79 (95% CI 0·76-0·83) in the Australian study and 0·73 (95% CI 0·70-0·75) in the Leeds study. The Hosmer-Lemeshow test P-value was 0·30 in the Australian study and < 0·001 in the Leeds study. CONCLUSIONS This model had good discrimination and could be used by clinicians to stratify patients by melanoma risk for the targeting of preventive interventions. What's already known about this topic? Melanoma risk prediction models may be useful in prevention by tailoring interventions to personalized risk levels. For reasons of feasibility, time and cost many melanoma prediction models use self-assessed risk factors. However, individuals tend to underestimate their naevus numbers. What does this study add? We present a melanoma risk prediction model, which includes clinically-assessed whole-body naevi and solar lentigines, and self-assessed risk factors including pigmentation phenotype and history of keratinocyte cancer. This model performs well on discrimination, the model's ability to distinguish between individuals with and without melanoma, and may assist clinicians to stratify patients by melanoma risk for targeted preventive interventions.
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Affiliation(s)
- K Vuong
- School of Public Health and Community Medicine, Westmead Institute for Medical Research, The University of New South Wales, Sydney, Australia
- Cancer Epidemiology and Prevention Research, Sydney School of Public Health, The University of Sydney, Sydney, Australia
| | - B K Armstrong
- Cancer Epidemiology and Prevention Research, Sydney School of Public Health, The University of Sydney, Sydney, Australia
| | - M Drummond
- Cancer Epidemiology and Prevention Research, Sydney School of Public Health, The University of Sydney, Sydney, Australia
| | - J L Hopper
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia
| | - J H Barrett
- Leeds Institute of Cancer and Pathology, Faculty of Medicine and Health, Leeds University, Leeds, U.K
| | - J R Davies
- Leeds Institute of Cancer and Pathology, Faculty of Medicine and Health, Leeds University, Leeds, U.K
| | - D T Bishop
- Leeds Institute of Cancer and Pathology, Faculty of Medicine and Health, Leeds University, Leeds, U.K
| | - J Newton-Bishop
- Leeds Institute of Cancer and Pathology, Faculty of Medicine and Health, Leeds University, Leeds, U.K
| | - J F Aitken
- Viertel Centre for Research in Cancer Control, Cancer Council Queensland, Brisbane, Australia
| | - G G Giles
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia
- Cancer Epidemiology Centre, Cancer Council Victoria, Melbourne, Australia
| | - H Schmid
- Centre for Cancer Research, Westmead Institute for Medical Research, The University of New South Wales, Sydney, Australia
| | - M A Jenkins
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, The University of Melbourne, Melbourne, Australia
| | - G J Mann
- Centre for Cancer Research, Westmead Institute for Medical Research, The University of New South Wales, Sydney, Australia
- Melanoma Institute Australia, The University of Sydney, Sydney, Australia
| | - K McGeechan
- Sydney School of Public Health, The University of Sydney, Sydney, Australia
| | - A E Cust
- Cancer Epidemiology and Prevention Research, Sydney School of Public Health, The University of Sydney, Sydney, Australia
- Melanoma Institute Australia, The University of Sydney, Sydney, Australia
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Cust A, Drummond M, Bishop D, Azizi L, Schmid H, Jenkins M, Hopper J, Armstrong B, Aitken J, Kefford R, Giles G, Demenais F, Goldstein A, Barrett J, Kanetsky P, Elder D, Mann G, Newton‐Bishop J. Associations of pigmentary and naevus phenotype with melanoma risk in two populations with comparable ancestry but contrasting levels of ambient sun exposure. J Eur Acad Dermatol Venereol 2019; 33:1874-1885. [PMID: 31087403 PMCID: PMC6800761 DOI: 10.1111/jdv.15680] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 05/03/2019] [Indexed: 11/29/2022]
Abstract
BACKGROUND People at high risk of developing melanoma are usually identified by pigmentary and naevus phenotypes. OBJECTIVE We examined whether associations of these phenotypes with melanoma risk differed by ambient sun exposure or participant characteristics in two population-based, case-control studies with comparable ancestry but different ambient sun exposure. METHODS Data were analysed from 616 cases and 496 controls from the Australian Melanoma Family Study and 2012 cases and 504 controls from the Leeds (UK) case-control study. Questionnaire, interview and dermatological skin examination data were collected using the same measurement protocols. Relative risks were estimated as odds ratios using unconditional logistic regression, adjusted for potential confounders. RESULTS Hair and skin colour were the strongest pigmentary phenotype risk factors. All associations of pigmentary phenotype with melanoma risk were similar across countries. The median number of clinically assessed naevi was approximately three times higher in Australia than Leeds, but the relative risks for melanoma associated with each additional common or dysplastic naevus were higher for Leeds than Australia, especially for naevi on the upper and lower limbs. Higher naevus counts on the head and neck were associated with a stronger relative risk for melanoma for women than men. The two countries had similar relative risks for melanoma based on self-reported naevus density categories, but personal perceptions of naevus number differed by country. There was no consistent evidence of interactions between phenotypes on risk. CONCLUSIONS Classifying people at high risk of melanoma based on their number of naevi should ideally take into account their country of residence, type of counts (clinical or self-reported), body site on which the naevus counts are measured and sex. The presence of naevi may be a stronger indicator of a genetic predisposition in the UK than in Australia based on less opportunity for sun exposure to influence naevus development.
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Affiliation(s)
- A.E. Cust
- Cancer Epidemiology and Prevention ResearchSydney School of Public HealthThe University of SydneySydneyAustralia
- Melanoma Institute AustraliaThe University of SydneySydneyAustralia
| | - M. Drummond
- Cancer Epidemiology and Prevention ResearchSydney School of Public HealthThe University of SydneySydneyAustralia
- Melanoma Institute AustraliaThe University of SydneySydneyAustralia
| | - D.T. Bishop
- Section of Epidemiology and BiostatisticsLeeds Institute of Cancer and PathologyUniversity of LeedsLeedsUK
| | - L. Azizi
- School of Mathematics and StatisticsThe University of SydneySydneyAustralia
| | - H. Schmid
- Centre for Cancer ResearchWestmead Institute for Medical ResearchThe University of SydneySydneyAustralia
| | - M.A. Jenkins
- Centre for Epidemiology and BiostatisticsMelbourne School of Population and Global HealthThe University of MelbourneMelbourneAustralia
| | - J.L. Hopper
- Centre for Epidemiology and BiostatisticsMelbourne School of Population and Global HealthThe University of MelbourneMelbourneAustralia
| | - B.K. Armstrong
- Cancer Epidemiology and Prevention ResearchSydney School of Public HealthThe University of SydneySydneyAustralia
| | - J.F. Aitken
- Viertel Centre for Research in Cancer ControlCancer Council QueenslandBrisbaneAustralia
| | - R.F. Kefford
- Melanoma Institute AustraliaThe University of SydneySydneyAustralia
- Macquarie University Health Sciences CentreMacquarie UniversitySydneyAustralia
| | - G.G. Giles
- Centre for Epidemiology and BiostatisticsMelbourne School of Population and Global HealthThe University of MelbourneMelbourneAustralia
- Cancer Epidemiology CentreCancer Council VictoriaMelbourneAustralia
| | - F. Demenais
- Genetic Variation and Human Diseases UnitUMR‐946INSERMUniversité Paris DiderotUniversité Sorbonne Paris CitéParisFrance
| | - A.M. Goldstein
- Human Genetics ProgramDivision of Cancer Epidemiology and GeneticsNational Cancer InstituteBethesdaMDUSA
| | - J.H. Barrett
- Section of Epidemiology and BiostatisticsLeeds Institute of Cancer and PathologyUniversity of LeedsLeedsUK
| | - P.A. Kanetsky
- Cancer Epidemiology ProgramMoffitt Cancer CenterTampaFLUSA
| | - D.E. Elder
- Department of Pathology and Laboratory MedicineUniversity of PennsylvaniaPhiladelphiaPAUSA
| | - G.J. Mann
- Melanoma Institute AustraliaThe University of SydneySydneyAustralia
- Centre for Cancer ResearchWestmead Institute for Medical ResearchThe University of SydneySydneyAustralia
| | - J.A. Newton‐Bishop
- Section of Epidemiology and BiostatisticsLeeds Institute of Cancer and PathologyUniversity of LeedsLeedsUK
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Affiliation(s)
- P. Karrer
- Zürich, Chemisches Institut der Universität
| | - H. Schmid
- Zürich, Chemisches Institut der Universität
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10
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Djerassi C, Budzikiewicz H, Owellen RJ, Wilson JM, Kump WG, Le Count DJ, Battersby AR, Schmid H. 82. Die Massenspektren von Alkaloiden der Refractin-Pleiocarpin-Klasse und die Struktur von Aspidofractinin, einem Nebenalkaloid aus Aspidosperma refractum Mart.: 26. Mitteilung über Massenspektroskopie und ihre Anwendung auf strukturelle und stereochemis. Helv Chim Acta 2018. [DOI: 10.1002/hlca.19630460306] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- C. Djerassi
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - H. Budzikiewicz
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - R. J. Owellen
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - J. M. Wilson
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - W. G. Kump
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - D. J. Le Count
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - A. R. Battersby
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
| | - H. Schmid
- Department of Chemistry, Stanford University, Stanford, California
- Chemistry Department, University of Bristol )
- Organisch-Chemisches Institut der Universität Zürich
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Abstract
The tunnel field-effect transistor (TFET) is regarded as one of the most promising solid-state switches to overcome the power dissipation challenge in ultra-low power integrated circuits. TFETs take advantage of quantum mechanical tunneling hence exploit a different current control mechanism compared to standard MOSFETs. In this review, we describe state-of-the-art development of TFET both in terms of performances and of materials integration and we identify the main remaining technological challenges such as heterojunction defects and oxide/channel interface traps causing trap-assisted-tunneling (TAT). Mesa-structures, planar as well as vertical geometries are examined. Conductance slope analysis on InAs/GaSb nanowire tunnel diodes are reported, these two-terminal measurements can be relevant to investigate the tunneling behavior. A special focus is dedicated to III-V heterostructure TFET, as different groups have recently shown encouraging results achieving the predicted sub-thermionic low-voltage operation.
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Schmid H, Gilardi E, Gregori G, Longo P, Maier J, van Aken PA. Structure and chemistry of interfaces between ceria and yttria-stabilized zirconia studied by analytical STEM. Ultramicroscopy 2018; 188:90-100. [PMID: 29602057 DOI: 10.1016/j.ultramic.2018.01.014] [Citation(s) in RCA: 3] [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] [Received: 08/10/2017] [Revised: 01/16/2018] [Accepted: 01/27/2018] [Indexed: 11/18/2022]
Abstract
Epitaxial undoped and Gd2O3-doped ceria films were grown by pulsed laser deposition on (1 1 1) faced Y2O3-stabilized zirconia (YSZ). Highly localized cerium reduction at the film-substrate interfaces is revealed by atomically resolved valence EELS mapping using Cs aberration-corrected scanning transmission electron microscopy. The chemical profiles reveal interdiffusion of Ce, (Gd), Y, Zr, forming an intermixing zone at the interface 7-9 (1 1 1) lattice planes wide. In its vicinity, the fraction of Ce3+ raises gradually over 6-8 lattice planes from zero in the bulk ceria to ≈100% in one single plane at the interface. Beyond this plane the Ce3+ fraction drops sharply within the YSZ substrate. In the vicinity of the interface systematic scan deflections are observed during EELS line scans. The advancing electron probe experiences a retarding force at the ceria side, and an accelerating force at the YSZ side, irrespective of the scan direction. This behavior is suggestive of coulombic interactions between the electron probe and a charged interface. This is interpreted as an indication of the presence of a space-charge situation at the YSZ/ceria interface, resulting from an excess negative charge at the ceria side (due to Ce3+cations) and an excess positive charge at the YSZ side (due to oxygen vacancies).
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Affiliation(s)
- H Schmid
- Stuttgart Center for Electron Microscopy at the Max Planck Institute for Solid State Research (MPI-FKF), Heisenbergstrasse 1, Stuttgart, 70569, Germany.
| | - E Gilardi
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - G Gregori
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - P Longo
- Gatan Inc., Pleasanton, CA, USA
| | - J Maier
- Department of Physical Chemistry of Solids, Max Planck Institute for Solid State Research, Stuttgart, Germany
| | - P A van Aken
- Stuttgart Center for Electron Microscopy at the Max Planck Institute for Solid State Research (MPI-FKF), Heisenbergstrasse 1, Stuttgart, 70569, Germany.
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Dias LS, Nienov OH, Goelzer Neto CF, Schmid H. Unsteady walking as a symptom in type 2 diabetes mellitus: independent association with depression and sedentary lifestyle and no association with diabetic neuropathy. ACTA ACUST UNITED AC 2018; 51:e6605. [PMID: 29590256 PMCID: PMC5886546 DOI: 10.1590/1414-431x20186605] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Accepted: 01/04/2018] [Indexed: 11/22/2022]
Abstract
The purpose of this study was to look at the determinants of the unsteady walking (UW) symptom in patients with type 2 diabetes mellitus (T2DM) by defining if UW and/or the Diabetic Neuropathy Symptoms Score (DNSS) are associated with positive scores in Beck's Depression Inventory (BDI) and with a positive Michigan Neuropathy Screening Instrument score (MNSI). We evaluated 203 T2DM patients without visible gait disturbances. They were divided into UW (+) and UW (−) or DNSS (+) and DNSS (−) according to symptoms. We found a prevalence of 48.3% for UW (+) and of 63% for DNSS (+) in our sample. In univariate analysis, the presence of UW was significantly associated with waist circumference (P=0.024), number of comorbidities (P=0.012), not practicing physical exercise (P=0.011), positive BDI score (P=0.003), presence of neuropathic symptoms by the MNSI questionnaire (P<0.001), and positive diabetic neuropathy screening by MNSI (P=0.021). In multivariate analysis, UW (used as a dependent variable) was independently associated with a positive BDI score (P<0.001; 95%CI=1.01-1.03), T2DM duration (P=0.023; 95%CI=1.00–1.03), number of co-morbidities (P=0.032; 95%CI=1.01–1.37), and a sedentary lifestyle (P=0.025; 95%CI=1.06–2.5). The UW symptom and a positive DNSS are more closely related to a positive score for depression than to presence of neuropathy in T2DM.
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Affiliation(s)
- L S Dias
- Programa de Pós-Graduação em Ciências da Saúde, Ginecologia e Obstetrícia, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil.,Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brasil
| | - O H Nienov
- Programa de Pós-Graduação em Ciências da Saúde, Ginecologia e Obstetrícia, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil
| | - C F Goelzer Neto
- Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brasil
| | - H Schmid
- Programa de Pós-Graduação em Ciências da Saúde, Ginecologia e Obstetrícia, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil.,Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, RS, Brasil.,Serviço de Endocrinologia, Hospital Santa Casa de Misericórdia de Porto Alegre, Porto Alegre, RS, Brasil.,Departamento de Medicina Interna, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brasil
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Glaser M, Palmhof M, Schulte D, Schmid H, Stute G, Dick HB, Joachim SC. [Marginal protection of retinal cells by bisperoxovanadium : Appropriate therapy in the model of retinal ischemia?]. Ophthalmologe 2018; 116:152-163. [PMID: 29404677 DOI: 10.1007/s00347-018-0651-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Ischemic processes usually lead to the destruction of retinal cells and therefore play a key role in a multitude of eye diseases. OBJECTIVE The aim of this study was to investigate whether bisperoxovanadium has a potential neuroprotective effect in an ischemia/reperfusion animal model. MATERIAL AND METHODS Initially, ischemia was induced in one eye of an ischemia/reperfusion model and 3 days later, a 14-day medication-based treatment was initiated. Bisperoxovanadium was administered intraperitoneally every 3 days. Subsequently, the number of ganglion cells, the rate of apoptosis, amacrine cells, macroglia, microglia, and their activation state, as well as photoreceptors were determined by histological and immunohistochemical analyses. RESULTS In comparison to the control group, a significant retinal ganglion cell loss, a significant reduction of the inner layers as well as a decrease in photoreceptor and amacrine cell numbers could be determined in the ischemic eyes. In addition, there was an increase in the number of microglia in these animals. The rats treated with bisperoxovanadium did not exhibit a significant neuroprotective effect regarding the number of ganglion cells, the rate of apoptosis, macroglia, amacrine cells, or photoreceptors; however, a low structural degeneration of photoreceptors could be observed as an effect of the treatment. Additionally, fewer microglia and activated microglia were observed after bisperoxovanadium treatment. CONCLUSION Bisperoxovanadium seems to have only a marginal neuroprotective effect on ischemic retinae. It needs to be examined whether earlier therapy onset, higher dose or different route of administration would significantly improve the results or whether this therapeutic approach is unsuitable.
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Affiliation(s)
- M Glaser
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - M Palmhof
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - D Schulte
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - H Schmid
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - G Stute
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - H B Dick
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland
| | - S C Joachim
- Experimental Eye Research Institute, Universitäts-Augenklinik, Ruhr-Universität Bochum, In der Schornau 23-25, 44892, Bochum, Deutschland.
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Signorello G, Sant S, Bologna N, Schraff M, Drechsler U, Schmid H, Wirths S, Rossell MD, Schenk A, Riel H. Manipulating Surface States of III-V Nanowires with Uniaxial Stress. Nano Lett 2017; 17:2816-2824. [PMID: 28383924 DOI: 10.1021/acs.nanolett.6b05098] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
III-V compound semiconductors are indispensable materials for today's high-end electronic and optoelectronic devices and are being explored for next-generation transistor logic and quantum technologies. III-V surfaces and interfaces play the leading role in determining device performance, and therefore, methods to control their electronic properties have been developed. Typically, surface passivation studies demonstrated how to limit the density of surface states. Strain has been widely used to improve the electronic transport properties and optoelectronic properties of III-Vs, but the potential of this technology to modify the surface properties still remains to be explored. Here we show that uniaxial stress induces a shift in the energy of the surface states of III-V nanowires, modifying their electronic properties. We demonstrate this phenomenon by modulating the conductivity of InAs nanowires over 4 orders of magnitude with axial strain ranging between -2.5% in compression and 2.1% in tension. The band bending at the surface of the nanostructure is modified from accumulation to depletion reversibly and reproducibly. We provide evidence of this physical effect using a combination of electrical transport measurement, Raman spectroscopy, band-structure modeling, and technology computer aided design (TCAD) simulations. With this methodology, the deformation potentials for the surface states are quantified. These results reveal that strain technology can be used to shift surface states away from energy ranges in which device performance is negatively affected and represent a novel route to engineer the electronic properties of III-V devices.
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Affiliation(s)
- G Signorello
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - S Sant
- Integrated Systems Laboratory, Department of Electrical Engineering and Information Technology, ETH Zürich , 8092 Zürich, Switzerland
| | - N Bologna
- Electron Microscopy Center, EMPA, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland
| | - M Schraff
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - U Drechsler
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - H Schmid
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - S Wirths
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
| | - M D Rossell
- Electron Microscopy Center, EMPA, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland
| | - A Schenk
- Integrated Systems Laboratory, Department of Electrical Engineering and Information Technology, ETH Zürich , 8092 Zürich, Switzerland
| | - H Riel
- IBM Research - Zurich , 8803 Rüschlikon, Switzerland
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Egli A, Schmid H, Kuenzli E, Widmer AF, Battegay M, Plagge H, Frei R, Achermann R, Weisser M. Association of daptomycin use with resistance development in Enterococcus faecium bacteraemia-a 7-year individual and population-based analysis. Clin Microbiol Infect 2016; 23:118.e1-118.e7. [PMID: 27746397 DOI: 10.1016/j.cmi.2016.10.003] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Revised: 09/23/2016] [Accepted: 10/03/2016] [Indexed: 11/15/2022]
Abstract
OBJECTIVE In this study we aimed to analyse the association between use of daptomycin and MICs of daptomycin in Enterococcus faecium bacteraemia. METHODS We prospectively enrolled patients aged ≥18 years with E. faecium bacteraemia hospitalized at the University Hospital Basel from 2008 to 2014. We determined daptomycin MICs by Etests and used pulsed field gel electrophoresis to determine clonal relatedness. We recorded the defined daily dosages of daptomycin (DDDs) per 100 patient-days and clinical data from charts. We correlated daptomycin MIC with use of daptomycin in patients with recurrence/persistence. RESULTS In 195 E. faecium bacteraemias originating from 162 patients the median MIC for daptomycin was 2 mg/L (IQR 2-3); 30% (15.4%) isolates had a MIC ≥4 mg/L and 6 (3.1%) were resistant (MIC >4 mg/L) according to CLSI criteria. The usage of daptomycin increased more than four-fold from 0.36 DDDs/100 patient-days in 2008 to 1.6 in 2014. In 13 of 28 (42.9%) patients with a relapsing or persisting bacteraemia, the daptomycin MIC of the second isolate increased from a median of 2.0 to 2.5 mg/L (p 0.010); 3/13 (23.1%) developed resistance. All patients with the same clone in the first and second episode and an increase of daptomycin MIC had been treated with daptomycin (6/6 versus 1/7 p 0.005). CONCLUSIONS Daptomycin MICs and Daptomycin usage increased over time. On an individual patient level daptomycin exposure was associated with an increased MIC in subsequent bacteraemia episodes. Diversity did not indicate a clonal origin and argues for a de novo development of resistance.
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Affiliation(s)
- A Egli
- Clinical Microbiology, Laboratory Medicine, University Hospital Basel, Basel, Switzerland; Applied Microbiology Research, Department Biomedicine, University of Basel, Switzerland
| | - H Schmid
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
| | - E Kuenzli
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland; Epidemiology, Biostatistics and Prevention Institute, University of Zürich, Zürich, Switzerland
| | - A F Widmer
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
| | - M Battegay
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland
| | - H Plagge
- Hospital Pharmacy, University Hospital Basel, Basel, Switzerland
| | - R Frei
- Clinical Microbiology, Laboratory Medicine, University Hospital Basel, Basel, Switzerland
| | - R Achermann
- Applied Microbiology Research, Department Biomedicine, University of Basel, Switzerland
| | - M Weisser
- Infectious Diseases and Hospital Epidemiology, University Hospital Basel, Basel, Switzerland; Department of Clinical Research, University Hospital Basel, Basel, Switzerland.
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Dummer R, Michielin O, Nägeli M, Goldinger S, Campigotto F, Kriemler-Krahn U, Schmid H, Pedroncelli A, Micaletto S, Schadendorf D. A phase I, open-label study of pasireotide in patients with BRAF- and NRAS-wild type, unresectable and or metastatic melanoma. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw379.43] [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: 11/13/2022] Open
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Knüver-Hopf J, Pohl U, Baumgarten E, Henze G, Schmid H, Mohr H. No Antibody Formation in Cancer Patients Treated with Natural Interleukin-2 in Combination with Recombinant Interferon-γ. ACTA ACUST UNITED AC 2015. [DOI: 10.1159/000422827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Karg SF, Troncale V, Drechsler U, Mensch P, Das Kanungo P, Schmid H, Schmidt V, Gignac L, Riel H, Gotsmann B. Full thermoelectric characterization of InAs nanowires using MEMS heater/sensors. Nanotechnology 2014; 25:305702. [PMID: 25004861 DOI: 10.1088/0957-4484/25/30/305702] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Precise measurements of a complete set of thermoelectric parameters on a single indium-arsenide nanowire (NW) have been performed using highly sensitive, micro-fabricated sensing devices based on the heater/sensor principle. The devices were fabricated as micro electro-mechanical systems consisting of silicon nitride membranes structured with resistive gold heaters/sensors. Preparation, operation and characterization of the devices are described in detail. Thermal decoupling of the heater/sensor platforms has been optimized reaching thermal conductances as low as 20 nW K(-1) with a measurements sensitivity below 20 nW K(-1). The InAs NWs were characterized in terms of thermal conductance, four-probe electrical conductance and thermopower (Seebeck coefficient), all measured on a single NW. The temperature dependence of the parameters determining the thermoelectric figure-of-merit of an InAs NW was acquired in the range 200-350 K featuring a minor decrease of the thermal conductivity from 2.7 W (m K)(-1) to 2.3 W (m K)(-1).
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Affiliation(s)
- S F Karg
- IBM Research-Zurich, Säumerstr. 4, 8803 Rüschlikon, Switzerland
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Affiliation(s)
- S. Hüsler
- Institut Soziale Arbeit und Gesundheit, Fachhochschule Nordwestschweiz, Hochschule für Soziale Arbeit, Olten, Schweiz
| | - H. Schmid
- Institut Soziale Arbeit und Gesundheit, Fachhochschule Nordwestschweiz, Hochschule für Soziale Arbeit, Olten, Schweiz
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Schmid H, Grytsan A, Poshtan E, Watton PN, Itskov M. Influence of differing material properties in media and adventitia on arterial adaptation — application to aneurysm formation and rupture. Comput Methods Biomech Biomed Engin 2013; 16:33-53. [DOI: 10.1080/10255842.2011.603309] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Abstract
The formation of characteristic inversion domain structures in zinc oxide (ZnO) is triggered by the addition of trivalent Fe(3+) or In(3+) dopants. As-grown and inverted ZnO domains are separated by two types of inversion domain boundaries (IDBs): basal b-IDBs parallel to {0001}, and pyramidal p-IDBs parallel to {21¯1¯5} lattice planes in three equivalent variants. Cs-corrected analytical TEM/STEM is the method of choice for a comprehensive structural and compositional characterization of these materials. It is shown by electron and X-ray spectroscopic imaging in STEM that dopant species are essentially localized within both types of IDBs, whereas solid solubility of trivalent dopants within ZnO domains is rather low (<0.5at%). Under the assumption of one monolayer per IDB the relation between inversion domain structure and integral dopant concentration correlates well with integral EDS and EELS measurements in STEM over well defined sample regions. The presence of one close-packed monolayer of trivalent dopant ions within a b-IDB is unambiguously confirmed by atomic resolution STEM imaging. Columns of cations are clearly imaged in high-angle annular dark-field (HAADF) STEM imaging, whereas annular bright-field (ABF) STEM is capable of imaging both light and heavy atom columns simultaneously. It is shown that structural details in ABF images are directly interpretable even in specimen regions with thickness >50nm. The structural inversion associated with a stacking fault as a consequence of the presence of octahedrally coordinated In(3+) in the b-IDB is directly revealed by atomic resolution imaging. Column positions in atomic resolution ABF imaging in In2O3-ZnO nanorods show that the oxygen sub-lattice continues across the b-IDB with only marginal distortions, whereas the cation sub-lattice suffers a rigid shift relative to the oxygen lattice as a result of the coordination geometry of ZnO4 tetrahedrons sharing common oxygen ions with the InO6 coordination octahedrons.
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Affiliation(s)
- H Schmid
- INM-Leibniz Institute for New Materials, 66123 Saarbrücken, Germany.
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Schmukat A, Duester L, Ecker D, Schmid H, Heil C, Heininger P, Ternes TA. Leaching of metal(loid)s from a construction material: influence of the particle size, specific surface area and ionic strength. J Hazard Mater 2012; 227-228:257-264. [PMID: 22683212 DOI: 10.1016/j.jhazmat.2012.05.045] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2012] [Revised: 05/08/2012] [Accepted: 05/12/2012] [Indexed: 06/01/2023]
Abstract
Construction materials are tested worldwide for a potential release of dangerous substances to prevent adverse effects on humans and biota. It is crucial to identify and understand the processes which are decisive for the release of hazardous substances. The current study compares the results of different test methods. Taking copper slag as model material, the influence of material particle size, eluant composition and ionic strength was tested. Ionic strength and salinity significantly influenced the release of metal(loid)s in the water phase. Furthermore, it was elucidated that colloids can cause methodological artefacts. The available specific surface area exhibited a positive correlation with the release of hazardous substances. The specific surface areas of materials were determined by the Brunauer, Emmett and Teller model (BET) and four other methods. The aluminium foil method showed the best results with regard to the statistical uncertainty, compared to a 3D laser scanning method. With help of the roughness factor λ it is possible to compare the results from surface area measurements with different material particle sizes (0-250 mm). This comparability offers the potential to match the release of metal(loid)s from laboratory studies with field applications and catchment area calculations/modelling, based on the release per m(2).
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Affiliation(s)
- A Schmukat
- Federal Institute of Hydrology, Department of Aquatic Chemistry, Koblenz, Germany
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Adamczak M, Koleganova N, Nyengaard JR, Ritz E, Wiecek A, Slabiak Blaz N, Yi Chun DX, Alexandre H, Sandrine GS, Olivier T, Isabelle E, Christophe L, Guy T, Pierre Francois W, Jean-Philippe R, Yvon L, Eric R, Muller-Krebs S, Muller-Krebs S, Weber L, Tsobaneli J, Reiser J, Zeier M, Schwenger V, Tinel C, Samson M, Bonnotte B, Mousson C, Machcinska M, Machcinska M, Bocian K, Wyzgal M, Korczak-Kowalska G, Ju MK, Huh KH, Park KT, Kim SJ, Cho BH, Kim CD, So BJ, Leee S, Kang CM, Joo DJ, Kim YS, Bocian K, Zarzycki M, Sobich A, Korczak-Kowalska G, Matsuyama M, Hase T, Yoshimura R, Koshino K, Sakai K, Suzuki T, Nobori S, Ushigome H, Brikci-Nigassa L, Chargui J, Touraine JL, Yoshimura N, Cantaluppi V, Medica D, Figliolini F, Migliori M, Mannari C, Dellepiane S, Quercia AD, Randone O, Tamagnone M, Messina M, Manzione AM, Ranghino A, Biancone L, Segoloni GP, Camussi G, Turk TR, Zou X, Rauen U, De Groot H, Amann K, Kribben A, Eckardt KU, Bernhardt WM, Witzke O, Lidia G, Wouter C, Yvon L, Eric A, Yann LM, Guy T, Christian N, Marie E, Pierre M, Zineb A, Miriana D, Annick M, Marc A, Daniel A, Wornle M, Ribeiro A, Motamedi N, Grone HJ, Cohen CD, Schlondorff D, Schmid H, Teplan V, Banas M, Banas B, Steege A, Bergler T, Kruger B, Schnulle P, Yard B, Kramer BK, Hoger S, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Xavier MP, Sampaio-Norton S, Gaiao S, Alves H, Oliveira G, Zaza G, Rascio F, Pontrelli P, Granata S, Rugiu C, Grandaliano G, Lupo A, Wohlfahrtova M, Wohlfahrtova M, Brabcova I, Balaz P, Janousek L, Lodererova A, Honsova E, Wohlfahrt P, Viklicky O, Grabner A, Grabner A, Kentrup D, Edemir B, Sirin Y, Pavenstadt H, Schober O, Schlatter E, Schafers M, Schnockel U, Reuter S, Rascio F, Pontrelli P, Accetturo M, Gigante M, Gigante M, Tataranni T, Zito A, Schena A, Schena FP, Stallone G, Gesualdo L, Grandaliano G, Maillard N, Masson I, Lena A, Manolie M, Eric A, Christophe M, Lassen CK, Keller AK, Moldrup U, Bibby BM, Jespersen B, Cvetkovic T, Velickovic Radovanovic R, Pavlovic R, Djordjevic V, Vlahovic P, Stefanovic N, Sladojevic N, Ignjatovic A, Rong S, Menne J, Haller H, Suszdak P, Tomczuk P, Gueler F, Nelli S, Sara D, Salma EK, Naoufal M, Tarik M, Mohamed Z, Guislaine M, Mohamed Gharbi B, Benyounes R, Lu X, Rong S, Shushakova N, Menne J, Kirsch T, Haller H, Gueler F, Bockmeyer CL, Bockmeyer CL, Ramackers W, Wittig J, Agustian PA, Klose J, Dammrich ME, Kreipe H, Brocker V, Winkler M, Becker JU, Agustian PA, Bockmeyer CL, Wittig J, Becker JU, Bockmeyer CL. Transplantation - basic. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs247] [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: 11/15/2022] Open
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MacGregor S, Brown KM, Stark M, Gartside M, Woods S, Bonazzi V, Aoude L, Dutton-Regester K, Tyagi S, Liu J, Duffy DL, Palmer J, Cust A, Schmid H, Symmons J, Holland E, Agha-Hamilton C, Holohan K, Youngkin D, Gillanders E, Jenkins MA, Kelly J, Whiteman DC, Kefford R, Giles G, Armstrong B, Aitken J, Hopper J, Montgomery G, Schmidt C, Trent JM, Martin NG, Mann GJ, Hayward NK. From GWAS to genome sequencing: complementary approaches to identify melanoma predisposition genes. Hered Cancer Clin Pract 2012. [PMCID: PMC3327126 DOI: 10.1186/1897-4287-10-s2-a46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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Schmid H, Schiffl H, Lederer SR. [Acute kidney injury]. Med Klin Intensivmed Notfmed 2012; 107:141-6. [PMID: 22437194 DOI: 10.1007/s00063-012-0098-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 11/24/2010] [Revised: 01/16/2011] [Accepted: 02/07/2011] [Indexed: 11/27/2022]
Abstract
Acute kidney injury plays a pivotal role in intensive care medicine and exerts crucial adverse effects on the course of the disease and overall prognosis of the critically ill patient. Intensive renal support, including initiation of earlier dialysis or maximal uremic toxin removal by higher dosage and frequency of renal replacement therapy, and individualized selection of modality were not able to decrease excessive mortality in this population. Systemic acute inflammation, mediated, at least in part, by cytokines, and not secondary uremic side effects, seems to have a major impact on nonrenal organ damage. Assessment of short-term outcome in critically ill patients who develop acute kidney injury may underestimate the true burden of disease. The overall survival at 5 years in patients discharged alive after severe acute kidney injury necessitating renal replacement therapy is only 20-30%, comparable to cancer patients. In addition, acute renal damage was identified as an independent risk factor for progression of chronic renal insufficiency. Current research focuses on strategies for the prevention of acute kidney injury and on the establishment of effective biomarkers for the early recognition and accurate diagnosis of subclinical renal damage.
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Affiliation(s)
- H Schmid
- KfH Kuratorium für Dialyse und Nierentransplantation e.V., KfH Nierenzentrum, Elsenheimerstr. 63, 80687, München, Deutschland
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Schmid H, Okunishi E, Oikawa T, Mader W. Structural and elemental analysis of iron and indium doped zinc oxide by spectroscopic imaging in Cs-corrected STEM. Micron 2012; 43:49-56. [DOI: 10.1016/j.micron.2011.05.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2011] [Revised: 05/13/2011] [Accepted: 05/31/2011] [Indexed: 10/18/2022]
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Horstmann M, Geiger LM, Vogel U, Schmid H, Hennenlotter J, Kuehs U, Merseburger AS, Kruck S, Stenzl A, Bedke J. Kidney-specific cadherin correlates with the ontogenetic origin of renal cell carcinoma subtypes: an indicator of a malignant potential? World J Urol 2011; 30:525-31. [PMID: 21928123 DOI: 10.1007/s00345-011-0763-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 09/03/2011] [Indexed: 10/17/2022] Open
Abstract
INTRODUCTION AND OBJECTIVES To evaluate retrospectively kidney-specific cadherin (Ksp-cad) expression in renal cell carcinoma (RCC) subtypes and oncocytoma in correlation with its ontogenetic origin of distal and proximal tubules and to correlate Ksp-cad expression with tumour characteristics. MATERIALS AND METHODS Membranous and cytoplasmic expression of Ksp-cad was determined in 40 clear cell (ccRCC), 25 papillary (pRCC), 19 chromophobe carcinomas (chRCC), 27 oncocytomas (oncocytomas) (n = 111) and 32 benign kidney parenchyma specimens separated in distal tubules (DT) and proximal tubules (PT) by immunohistochemistry using tissue microarray technique. Staining intensity was quantified as a score ranging from 0 to 12. Comparison of data and correlation with tumour characteristics were done by Wilcoxon/Kruskal-Wallis tests (post hoc Tukey-Kramer analysis). RESULTS In benign renal tissue, membranous and cytoplasmic expression of Ksp-cad in the DT was significantly higher than that in the PT (12.0 ± 0 vs. 5.2 ± 0.3 and 6.3 ± 0.5 vs. 0.0 ± 0.0, respectively; (P < 0.05)). Membranous KSP-cad expression was significantly higher in chRCC (5.2 ± 0.8) and oncocytomas (3.7 ± 0.4) than that in ccRCC (0.8 ± 0.2) and pRCC (1.4 ± 0.4; P < 0.05), while expression between oncocytomas and chRCC did not differ significantly. In RCC, Ksp-cad expression was significantly associated with higher T stage and the occurrence of synchronous metastasis (P < 0.05). Higher N stages and grading tended to correlate with a lower Ksp-cad expression. CONCLUSIONS In this cohort, the origin of tumour subtypes-chRCC and oncocytomas develop from DT and ccRCC and pRCC from PT cells-is mirrored by the respective Ksp-cad expression. This raises the question whether DT-derived tumours have a less malignant potential than PT-derived tumours.
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Affiliation(s)
- M Horstmann
- Department of Urology, Eberhard Karls University Tuebingen, Hoppe-Seyler-Strasse 3, Tuebingen, Germany.
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Boedecker S, Rembe C, Schmid H, Hageney T, Köhnlein T. Calibration of the z-axis for large-scale scanning white-light interferometers. ACTA ACUST UNITED AC 2011. [DOI: 10.1088/1742-6596/311/1/012027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Winkelmayer W, Liu J, Brookhart A, Wang HY, Kan WC, Chien CC, Fang TC, Lin HF, Li YH, Wang CH, Chou CL, Yazawa M, Shibagaki Y, Kimura K, Ohira S, Ryo K, Hasegawa T, Hanafusa N, Tsubakihara Y, Iseki K, Chen HY, Cheng IC, Pan YJ, Chiu YL, Hsu SP, Pai MF, Yang JY, Peng YS, Tsai TJ, Wu KD, Dzekova-Vidimliski P, Severova-Andreevska G, Pavlevska S, Trajceska L, Selim G, Gelev S, Sikole A, Hecking M, Karaboyas A, Saran R, Sen A, Inaba M, Horl WH, Pisoni R, Robinson B, Sunder-Plassmann G, Port FK, Chiroli S, Perrault L, Mitchell D, Mattin C, Krause R, Roth HJ, Schober-Halstenberg HJ, Edenharter G, Frei U, Wilson R, Adena M, Hodgkins P, Keith M, Smyth M, Couchoud C, Galland R, Man NK, Chanliau J, Lemaitre V, Traeger J, von Gersdorff G, Vega O, Schaller M, Usvyat L, Levin N, Barth C, Kotanko P, Vega O, Usvyat L, Rosales L, Thijssen S, Levin N, Kotanko P, Schmid H, Schiffl H, Romanos A, Lederer S, Chu KH, Lam B, Tang C, Wong S, Cheuk A, Yim KF, Tang HL, Lee W, Fung KS, Chan H, Ng TK, Tong KL, Doyle M, Severn A, Traynor J, Metcalfe W, Boyd J, Cairns S, Reilly J, Henderson A, Simpson K, Tovbin D, Douvdevani A, Novack V, Abd Elkadir A, Zlotnik M, Djuric Z, Dimkovic N, Popovic J, Furumatsu Y, Yamazaki S, Hayashino Y, Takegami M, Yamamoto Y, Kakudate N, Wakita T, Akizawa T, Akiba T, Saito A, Kurokawa K, Fukuhara S, Voronovitsky G, Pinelli L, Paganti L, Silva J, Garofalo R, Reiss E, Gimenez Torrado J, Lafroscia P, Lugo M, Laplante S, Vanovertveld P, Nordio M, Limido A, Maggiore U, Nichelatti M, Postorino M, Quintaliani G, Ebah L, Kanigicherla D, Nikam M, Dutton G, Mitra S, Attipoe L, Baharani J, Pinelli L, Voronovitsky G, Magrini G, Martorell A, Lugo M, Mashima Y, Konta T, Kudo K, Suzuki K, Ikeda A, Takasaki S, Kubota I, Chudek J, Wieczorowska-Tobis K, Wiecek A, Members of the "PolSenior" Study Group, des Grottes JM, Collart F, Lemaitre V, Maheut H, Couchoud C, Goodkin DA, Bieber B, Robinson BM, Jadoul M, Djogan M, Dudar I, Sergeyeva T, Hanafusa N, Yamagata K, Nishi H, Nishi S, Iseki K, Tsubakihara Y, Hommel K, Madsen M, Blicher TM, Kamper AL, Masakane I, Ito S, Seino M, Ito M, Nagasawa J, Rayner HC, Fuller DS, Gillespie BW, Hasegawa T, Morgenstern H, Robinson BM, Saran R, Tentori F, Pisoni RL, Chien CC, Wang JJ, Hwang JC, Wang HY, Kan WC, Trajceska L, Mladenovska D, Severova G, Amitov V, Selim G, Gelev S, Dzekova-Vidimliski P, Sikole A, Yadav P, Baharani J, Attipoe L, Baharani J, Carrero JJ, Jager DJ, Verduijn M, Ravani P, De Meester J, Heaf JG, Finne P, Hoitsma AJ, Pascual J, Jarraya F, Reisaeter AV, Collart F, Dekker FW, Jager KJ, Trajceska L, Mladenovska D, Severova G, Gelev S, Selim G, Amitov V, Sikole A, Sammut H, Ahmed MSA, Sheppard J, Attwood N, Cserep G, Sinnamon K, Pinelli L, Voronovitsky G, Lugo M, Reiss E, Katsipi I, Tatsiopoulos A, Doulgerakis C, Papanikolaou P, Kardouli E, Lamprinoudis G, Kintzoglanakis K, Gennadiou M, Kyriazis J, Granger Vallee A, Covic E, Morena M, Fournier A, Canaud B, Bolignano D, Rastelli S, Curatola G, Caridi G, Tripepi R, Tripepi G, Politi R, Catalano F, Delfino D, Ciccarelli M, Mallamaci F, Zoccali C. Epidemiology & outcome in CKD 5D (1). Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.41] [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: 11/15/2022] Open
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Wornle M, Ribeiro A, Motamedi N, Nitschko H, Cohen CD, Grone HJ, Schlondorff D, Schmid H, Kislat C, Schmidt T, Janssen M, Wolf M, Dirks J, Ahlenstiel T, Pape L, Fliser D, Sester M, Sester U, Urbanova M, Brabcova I, Girmanova E, Ondrej V, Gregorini M, Rampino T, Rocca C, Valsania T, Corradetti V, Bosio F, Bedino G, Carrara C, Pattonieri EF, Soccio G, Esposito P, Dal Canton A, Becker LE, Morath C, Schaier M, Gross ML, Bierhaus A, Waldherr R, Nawroth P, Zeier M, Tataranni T, Biondi G, Cariello M, Mangino M, Colucci G, Rutigliano M, Ditonno P, Schena FP, Pertosa G, Gesualdo L, Grandaliano G. Transplantation / Basic research. Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.4] [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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Schmid H, Pauli L, Paulus A, Kuhl E, Itskov M. Consistent formulation of the growth process at the kinematic and constitutive level for soft tissues composed of multiple constituents. Comput Methods Biomech Biomed Engin 2011; 15:547-61. [PMID: 21347909 DOI: 10.1080/10255842.2010.548325] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Previous studies have investigated the possibilities of modelling the change in volume and change in density of biomaterials. This can be modelled at the constitutive or the kinematic level. This work introduces a consistent formulation at the kinematic and constitutive level for growth processes. Most biomaterials consist of many constituents and can be approximated as being incompressible. These two conditions (many constituents and incompressibility) suggest a straightforward implementation in the context of the finite element (FE) method which could now be validated more easily against histological measurements. Its key characteristic variable is the normalised partial mass change. Using the concept of homeostatic equilibrium, we suggest two complementary growth laws in which the evolution of the normalised partial mass change is governed by an ordinary differential equation in terms of either the Piola-Kirchhoff stress or the Green-Lagrange strain. We combine this approach with the classical incompatibility condition and illustrate its algorithmic implementation within a fully nonlinear FE approach. This approach is first illustrated for a simple uniaxial tension and extension test for pure volume change and pure density change and is validated against previous numerical results. Finally, a physiologically based example of a two-phase model is presented which is a combination of volume and density changes. It can be concluded that the effect of hyper-restoration may be due to the systemic effect of degradation and adaptation of given constituents.
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Affiliation(s)
- H Schmid
- Department of Continuum Mechanics, RWTH Aachen University, Eilfschornsteinstrasse 18, 56062 Aachen, Germany.
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Hansen HJ, Sutter B, Schmid H. Die Dienol-Benzol-Umlagerung von Allyldienolen: aromatische [1,2]-, [3,3]- und [3,4]-sigmatropische Umlagerungen. Helv Chim Acta 2011. [DOI: 10.1002/hlca.660510422] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Hasskarl J, Kaufmann M, Schmid H, Metz DC. The potential role of somatostatin analogues in the treatment of gastrointestinal (GI) cancers. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.4_suppl.150] [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: 11/20/2022] Open
Abstract
150 Background: Somatostatin receptors (sstr) are expressed in various normal and malignant tissues, including non-neuroendocrine GI solid tumors. Gastric cancer (GC) cells mainly express sstr2 and sstr5, colorectal cancer (CRC) cells predominantly express sstr1 followed by sstr5 and sstr2, and hepatocellular carcinoma (HCC) cells express mainly sstr5 as well as sstr1,2,3. Somatostatin analogues (SAs) may have direct and indirect antitumor activity. Octreotide and lanreotide primarily target sstr2, whereas the new agent pasireotide has high affinity for sstr1,2,3 and sstr5. Methods: Published data evaluating the antitumor properties of SAs in GI tumors were reviewed. Results: The table lists the results of clinical studies in which SAs were evaluated as antitumor therapies in GI cancers. Conclusions: Although octreotide and lanreotide are efficacious in the treatment of symptoms of neuroendocrine tumors, these agents have demonstrated mixed results in the antitumor treatment of non-neuroendocrine GI tumors. Data suggesting potential favorable outcomes with SAs alone or in combination with other agents have been seen in solid tumors with predominant sstr2 expression such as GC. Novel SAs such as pasireotide may have improved antitumor effects in non-neuroendocrine solid tumors expressing multiple sstr compared with octreotide and lanreotide. [Table: see text] [Table: see text]
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Affiliation(s)
- J. Hasskarl
- Novartis Pharma AG, Basel, Switzerland; University of Pennsylvania School of Medicine, Philadelphia, PA
| | - M. Kaufmann
- Novartis Pharma AG, Basel, Switzerland; University of Pennsylvania School of Medicine, Philadelphia, PA
| | - H. Schmid
- Novartis Pharma AG, Basel, Switzerland; University of Pennsylvania School of Medicine, Philadelphia, PA
| | - D. C. Metz
- Novartis Pharma AG, Basel, Switzerland; University of Pennsylvania School of Medicine, Philadelphia, PA
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Bernauer K, Schmid H, Karrer P. Ein triquartäres Calebassin-Derivat. Beitrag zur Festlegung der Bruttoformel des C-Calebassins. 28. Mitteilung über Calebassen-Alkaloide. Helv Chim Acta 2010. [DOI: 10.1002/hlca.660410105] [Citation(s) in RCA: 9] [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: 11/09/2022]
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Haegele W, Schmid H. Kinetik der thermischen Umlagerung von 2-[α-14C]-6-Diallylphenyl-allyläther. (Zur Kenntnis der Claisen-Umlagerung X). Helv Chim Acta 2010. [DOI: 10.1002/hlca.660410310] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Berlage F, Bernauer K, Schmid H, Karrer P. Lumi-dihydro-toxiferin I, ein neues Bestrahlungsprodukt des C-Dihydro-toxiferins. 30. Mitteilung über Calebassen-Alkaloide. Helv Chim Acta 2010. [DOI: 10.1002/hlca.660410314] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [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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Bernauer K, Schmid H, Karrer P. Zur Kenntnis des C-Calebassins: Calebassin-dimethyläther. 29. Mitteilung über Calebassen-Alkaloide. Helv Chim Acta 2010. [DOI: 10.1002/hlca.660410313] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [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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Moselund KE, Ghoneim H, Schmid H, Björk MT, Lörtscher E, Karg S, Signorello G, Webb D, Tschudy M, Beyeler R, Riel H. Solid-state diffusion as an efficient doping method for silicon nanowires and nanowire field effect transistors. Nanotechnology 2010; 21:435202. [PMID: 20890021 DOI: 10.1088/0957-4484/21/43/435202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work we investigate doping by solid-state diffusion from a doped oxide layer, obtained by plasma-enhanced chemical vapor deposition (PECVD), as a means for selectively doping silicon nanowires (NWs). We demonstrate both n-type (phosphorous) and p-type (boron) doping up to concentrations of 10(20) cm(-3), and find that this doping mechanism is more efficient for NWs as opposed to planar substrates. We observe no diameter dependence in the range of 25 to 80 nm, which signifies that the NWs are uniformly doped. The drive-in temperature (800-950 °C) can be used to adjust the actual doping concentration in the range 2 × 10(18) to 10(20) cm(-3). Furthermore, we have fabricated NMOS and PMOS devices to show the versatility of this approach and the possibility of achieving segmented doping of NWs. The devices show high I(on)/I(off) ratios of around 10(7) and, especially for the PMOS, good saturation behavior and low hysteresis.
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Schmid H, Wang W, Hunter PJ, Nash MP. A finite element study of invariant-based orthotropic constitutive equations in the context of myocardial material parameter estimation. Comput Methods Biomech Biomed Engin 2010; 12:691-9. [PMID: 19639485 DOI: 10.1080/10255840902870427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
A previous study investigated a number of invariant-based orthotropic and transversely isotropic constitutive equations for their suitability to fit three-dimensional simple shear mechanics data of passive myocardial tissue. The study was based on the assumption of a homogeneous deformation. Here, we extend the previous study by performing an inverse finite element material parameter estimation. This ensures a more realistic deformation state and material parameter estimates. The constitutive relations were compared on the basis of (i) 'goodness of fit': how well they fit a set of six shear deformation tests and (ii) 'variability': how well determined the material parameters are over the range of experiments. These criteria were utilised to discuss the advantages and disadvantages of the constitutive relations. It was found that a specific form of the polyconvex type as well as the exponential Fung-type equations were most suitable for modelling the orthotropic behaviour of myocardium under simple shear.
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Affiliation(s)
- H Schmid
- Department of Continuum Mechanics, RWTH Aachen University, Aachen, Germany.
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Schmid H, Watton PN, Maurer MM, Wimmer J, Winkler P, Wang YK, Röhrle O, Itskov M. Impact of transmural heterogeneities on arterial adaptation. Biomech Model Mechanobiol 2009; 9:295-315. [DOI: 10.1007/s10237-009-0177-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2009] [Accepted: 10/26/2009] [Indexed: 10/20/2022]
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Schmid H, Wang YK, Ashton J, Ehret AE, Krittian SBS, Nash MP, Hunter PJ. Myocardial material parameter estimation: a comparison of invariant based orthotropic constitutive equations. Comput Methods Biomech Biomed Engin 2009; 12:283-95. [PMID: 19089682 DOI: 10.1080/10255840802459420] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This study investigated a number of invariant based orthotropic and transversely isotropic constitutive equations for their suitability to fit three-dimensional simple shear mechanics data of passive myocardial tissue. A number of orthotropic laws based on Green strain components and one microstructurally based law have previously been investigated to fit experimental measurements of stress-strain behaviour. Here we extend this investigation to include several recently proposed functional forms, i.e. invariant based orthotropic and transversely isotropic constitutive relations. These laws were compared on the basis of (i) 'goodness of fit': how well they fit a set of six shear deformation tests, (ii) 'variability': how well determined the material parameters are over the range of experiments. These criteria were utilised to discuss the advantages and disadvantages of the constitutive laws. It was found that a specific form of the polyconvex type as well as the exponential Fung-type law from the previous study were most suitable for modelling the orthotropic behaviour of myocardium under simple shear.
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Affiliation(s)
- H Schmid
- Department of Continuum Mechanics, RWTH Aachen University, Aachen, Germany.
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