1
|
Förster S, Schenk S, Cockayne E, Wührl F, Tran L, Haller M, Krahn O, Meyerheim H, De Boissieu M, Widdra W. From honeycomb structures to 2D quasicrystals: alkaline earth metal decorated Ti 2O 3 monolayers. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322095432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
|
2
|
Digeni A, Förster S, Birkena M, Schiermeier S. Adenomotoid Tumor des Uterus bei gleichzeitiger Endometriose. Laparoskopische Vorgehen. Fallbericht. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1718259] [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: 10/23/2022] Open
Affiliation(s)
- A Digeni
- Lehrstuhl für Gynäkologie und Geburtshilfe der Universität Witten/Herdecke, Marien Hospital Witten
| | - S Förster
- Institut für Pathologie, Ruhr-Universität Bochum
| | - M Birkena
- Lehrstuhl für Gynäkologie und Geburtshilfe der Universität Witten/Herdecke, Marien Hospital Witten
| | - S Schiermeier
- Lehrstuhl für Gynäkologie und Geburtshilfe der Universität Witten/Herdecke, Marien Hospital Witten
| |
Collapse
|
3
|
Abstract
In pathological diagnostics, monoclonal antibodies (mAb) are mainly used for immunhistochemical analysis. After an initial histological evaluation, a precise panel of antibodies is selected in order to stain the slides by using an indirect immune method. The most frequent issues include localisation of the primary tumor in cases of metastases, determination of undifferentiated tumors, subtyping of lympho-proliferative diseases and soft tissue tumors, as well as the assessment of proliferation via Ki-67. Increasing importance in mAb-based diagnostics is attributed to the analysis of predictive biomarkers such as hormone receptors, mismatch repair proteins (MMR) and programmed death ligand 1 (PD-L1). Their evaluation is performed by using different scores, which the clinical physician needs to be aware of due to their direct therapeutic implications.
Collapse
Affiliation(s)
- S Förster
- Institut für Pathologie, Berufsgenossenschaftliches Universitätskliniken Bergmannsheil, Ruhr-Universität Bochum, Bürkle-de-la-Camp-Platz 1, 44789, Bochum, Deutschland.
| | - A Tannapfel
- Institut für Pathologie, Berufsgenossenschaftliches Universitätskliniken Bergmannsheil, Ruhr-Universität Bochum, Bürkle-de-la-Camp-Platz 1, 44789, Bochum, Deutschland
| |
Collapse
|
4
|
Novak E, Jalarvo N, Gupta S, Hong K, Förster S, Egami T, Ohl M. Dynamics in the Plastic Crystalline Phases of Cyclohexanol and Cyclooctanol Studied by Quasielastic Neutron Scattering. J Phys Chem B 2018; 122:6296-6304. [PMID: 29775540 DOI: 10.1021/acs.jpcb.8b03448] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Plastic crystals are a promising candidate for solid state ionic conductors. In this work, quasielastic neutron scattering is employed to investigate the center of mass diffusive motions in two types of plastic crystalline cyclic alcohols: cyclohexanol and cyclooctanol. Two separate motions are observed which are attributed to long-range translational diffusion (α-process) and cage rattling (fast β-process). Residence times and diffusion coefficients are calculated for both processes, along with the confinement distances for the cage rattling. In addition, a binary mixture of these two materials is measured to understand how the dynamics change when a second type of molecule is added to the matrix. It is observed that, upon the addition of the larger cyclooctanol molecules into the cyclohexanol solution, the cage size decreases, which causes a decrease in the observed diffusion rates for both the α- and fast β-processes.
Collapse
Affiliation(s)
- E Novak
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Neutron Sciences Directorate , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - N Jalarvo
- Neutron Sciences Directorate , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - S Gupta
- Department of Chemistry and Macromolecular Studies Group , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - K Hong
- Center for Nanophase Materials Sciences , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Department of Chemical and Biomolecular Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - S Förster
- Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| | - T Egami
- Department of Materials Science and Engineering , University of Tennessee , Knoxville , Tennessee 37996 , United States.,Materials Science and Technology Division , Oak Ridge National Laboratory (ORNL) , Oak Ridge , Tennessee 37831 , United States.,Department of Physics and Astronomy , University of Tennessee , Knoxville , Tennessee 37996 , United States
| | - M Ohl
- Jülich Centre for Neutron Science (JCNS) , Forschungszentrum Jülich GmbH , 52425 Jülich , Germany
| |
Collapse
|
5
|
Deville S, Förster S, Cordes N. PO-122 Synemin is a novel co-regulator of non-homologous end joining in head and neck cancer cells. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.647] [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: 11/03/2022] Open
|
6
|
Förster S, Trautmann M, Roy S, Adeagbo WA, Zollner EM, Hammer R, Schumann FO, Meinel K, Nayak SK, Mohseni K, Hergert W, Meyerheim HL, Widdra W. Observation and Structure Determination of an Oxide Quasicrystal Approximant. Phys Rev Lett 2016; 117:095501. [PMID: 27610863 DOI: 10.1103/physrevlett.117.095501] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Indexed: 06/06/2023]
Abstract
We report on the first observation of an approximant structure to the recently discovered two-dimensional oxide quasicrystal. Using scanning tunneling microscopy, low-energy electron diffraction, and surface x-ray diffraction in combination with ab initio calculations, the atomic structure and the bonding scheme are determined. The oxide approximant follows a 3^{2}.4.3.4 Archimedean tiling. Ti atoms reside at the corners of each tiling element and are threefold coordinated to oxygen atoms. Ba atoms separate the TiO_{3} clusters, leading to a fundamental edge length of the tiling 6.7 Å.
Collapse
Affiliation(s)
- S Förster
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - M Trautmann
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - S Roy
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - W A Adeagbo
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - E M Zollner
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - R Hammer
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - F O Schumann
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - K Meinel
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - S K Nayak
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - K Mohseni
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - W Hergert
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
| | - H L Meyerheim
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| | - W Widdra
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
| |
Collapse
|
7
|
Gerontopoulou S, Förster S, Rass K. Analyse des kurzfristigen Behandlungsergebnisses nach inguinaler Crossenrevision. Akt Dermatol 2015. [DOI: 10.1055/s-0035-1558586] [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: 10/23/2022]
|
8
|
Philipp M, Förster S, Klar E. [Inguinal Hernia Repair According to Desarda - Implementation of a Mesh-Free Method in a German University Hospital]. Zentralbl Chir 2015; 140:373-4. [PMID: 26266473 DOI: 10.1055/s-0035-1545865] [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: 10/23/2022]
Abstract
Inguinal hernia repair shows a clear tendency towards mesh-based as well as laparoscopic approaches. This is widely reflected in data-based statistics and guidelines. In contrast we have initiated and hereby illustrate the surgical method according to Desarda using autologous fascia to repair inguinal hernia.
Collapse
Affiliation(s)
- M Philipp
- Allgemein-, Thorax-, Gefäß- und Transplantationschirurgie, Chirurgische Universitätsklinik Rostock, Deutschland
| | - S Förster
- Allgemein-, Thorax-, Gefäß- und Transplantationschirurgie, Chirurgische Universitätsklinik Rostock, Deutschland
| | - E Klar
- Allgemein-, Thorax-, Gefäß- und Transplantationschirurgie, Chirurgische Universitätsklinik Rostock, Deutschland
| |
Collapse
|
9
|
Philipp M, Förster S, Klar E. [Loss of domain-a surgeon's challenge. Surgical approach to an enormous scrotal hernia]. Chirurg 2015; 85:1005-9. [PMID: 24996383 DOI: 10.1007/s00104-014-2789-8] [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: 11/27/2022]
Abstract
We report on the one-stage procedure surgical approach to an enormous scrotal hernia bearing the whole small bowel and part of the large bowel as a loss of domain situation. Using a mesh-based component separation abdominal wall technique according to Ramirez we managed to retrieve the hernia content into the abdominal cavity allowing reduction of the resulting intra-abdominal pressure. We present our surgical approach in detail and report on the postoperative process based on focused intensive care surveillance and specific surgical complication management leading to hospital discharge of the patient on postoperative day 57.
Collapse
Affiliation(s)
- M Philipp
- Abteilung für Allgemeine, Thorax-, Gefäß- und Transplantationschirurgie, Chirurgische Universitätsklinik Rostock, Schillingallee 35, 18057, Rostock, Deutschland,
| | | | | |
Collapse
|
10
|
Förster S, Reimer T, Rimbach S, Louwen F, Volk T, Bürkle H, Benecke C, Carus T, Türler A, Wullstein C, Ludwig K. [CAMIC Recommendations for Surgical Laparoscopy in Non-Obstetric Indications during Pregnancy]. Zentralbl Chir 2015. [PMID: 26205984 DOI: 10.1055/s-0035-1545904] [Citation(s) in RCA: 2] [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: 10/23/2022]
Abstract
In the operative surgical primary care, the laparoscopic surgical technique has firmly established itself in recent years. Meanwhile, in the normal population over 90 % of all cholecystectomies and over 80 % of all appendectomies are performed in a minimally invasive manner. The proven benefits of the laparoscopic surgical technique, compared with conventional open surgery, are a comparatively rapid early postoperative recovery with early resumption of the general physical and occupational activity. As these benefits are equally applicable for necessary interventions during pregnancy, in recent years laparoscopy has become the preferred treatment for non-obstetric indications in the gravid patient. Overall, it can be assumed that such interventions have to be performed in approximately 2 % of all pregnant patients. Numerous studies have proven here that the use of laparoscopic techniques, in particular for the expectant mother, is safe and not associated with an increased risk. On the other hand, the current pregnancy makes necessary an adapted approach to the solution of surgical problems to ensure the protection of the unborn child. On the basis of currently available data situation, recommendations are formulated which can be used as a decision-making support for a variety of clinical situations.
Collapse
Affiliation(s)
- S Förster
- Klinik für Allgemein-, Viszeral-, Thorax- und Gefäßchirurgie, Klinikum Südstadt, Rostock, Deutschland
| | - T Reimer
- Universitätsfrauenklinik und Poliklinik am Klinikum Südstadt, Rostock
| | - S Rimbach
- Landeskrankenhaus Feldkirch, Gynäkologie und Geburtshilfe, Feldkirch, Österreich
| | - F Louwen
- Klinik für Frauenheilkunde und Geburtsmedizin, Universitätsklinikum Frankfurt am Main
| | - T Volk
- Klinik für Anästhesiologie, Intensivmedizin und Schmerztherapie, Universitätsklinikum des Saarlandes, Homburg, Saar
| | - H Bürkle
- Klinik für Anästhesiologie und Intensivmedizin, Universitätsklinikum Freiburg
| | - C Benecke
- Klinik für Chirurgie, Universitätsklinikum Schleswig-Holstein, Campus Lübeck
| | - T Carus
- Klinik für Allgemin-, Viszeral- und Unfallchirurgie, Klinikum Bremen Ost
| | - A Türler
- Klinik für Allgemein- und Viszeralchirurgie, Johanniter-Klinikum Bonn
| | - C Wullstein
- Klinik für Allgemein-, Viszeral- und Minimalinvasive Chirurgie, Helios Klinikum Krefeld
| | - K Ludwig
- Klinik für Allgemein-, Viszeral-, Thorax- und Gefäßchirurgie, Klinikum Südstadt, Rostock, Deutschland
| |
Collapse
|
11
|
|
12
|
Förster S, Kohl E, Ivanov M, Gross J, Widdra W, Janke W. Polymer adsorption on reconstructed Au(001): A statistical description of P3HT by scanning tunneling microscopy and coarse-grained Monte Carlo simulations. J Chem Phys 2014; 141:164701. [DOI: 10.1063/1.4898382] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- S. Förster
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - E. Kohl
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
| | - M. Ivanov
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
| | - J. Gross
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
| | - W. Widdra
- Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany
- Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany
| | - W. Janke
- Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, D-04009 Leipzig, Germany
| |
Collapse
|
13
|
Pyka T, Gempt J, Ringel F, Hüttinger S, van Marwick S, Nekolla S, Wester HJ, Schwaiger M, Förster S. Prediction of glioma recurrence using dynamic ¹⁸F-fluoroethyltyrosine PET. AJNR Am J Neuroradiol 2014; 35:1924-9. [PMID: 24924547 DOI: 10.3174/ajnr.a3980] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
BACKGROUND AND PURPOSE Inter- and intratumor heterogeneity and the variable course of disease in patients with glioma motivate the investigation of new prognostic factors to optimize individual treatment. Here we explore the usefulness of standard static and more sophisticated dynamic (18)F-fluoroethyltyrosine-PET imaging for the assessment of patient prognosis. MATERIALS AND METHODS Thirty-four consecutive patients with untreated, first-diagnosed, histologically proved glioma were included in this retrospective study. All patients underwent dynamic PET scans before surgery (± standard treatment) and were followed up clinically and by MR imaging. Static and dynamic tumor-to-background ratio, TTP, and slope-to-peak were obtained and correlated with progression-free survival. RESULTS Twenty of 34 patients experienced progression, with a median progression-free survival of 28.0 ± 11.1 months. Dynamic TTP was highly prognostic for recurrent disease, showing a strong correlation with progression-free survival (hazard ratio, 6.050; 95% CI, 2.11-17.37; P < .001). Most interesting, this correlation also proved significant in the subgroup of low-grade glioma (hazard ratio, 5.347; 95% CI, 1.05-27.20; P = .044), but not when using established static imaging parameters, such as maximum tumor-to-background ratio and mean tumor-to-background ratio. In the high-grade glioma subgroup, both dynamic and static parameters correlated with progression-free survival. The best results were achieved by defining ROIs around "hot spots" in earlier timeframes, underlining the concept of intratumor heterogeneity. CONCLUSIONS (18)F-fluoroethyltyrosine-PET can predict recurrence in patients with glioma, with dynamic analysis showing advantages over static imaging, especially in the low-grade subgroup.
Collapse
Affiliation(s)
- T Pyka
- From the Departments of Nuclear Medicine (T.P., S.v.M., S.N., M.S., S.F)
| | | | | | | | - S van Marwick
- From the Departments of Nuclear Medicine (T.P., S.v.M., S.N., M.S., S.F)
| | - S Nekolla
- From the Departments of Nuclear Medicine (T.P., S.v.M., S.N., M.S., S.F)
| | - H-J Wester
- Pharmaceutical Radiochemistry (H.-J.W.), Technical University Munich, Munich, Germany
| | - M Schwaiger
- From the Departments of Nuclear Medicine (T.P., S.v.M., S.N., M.S., S.F)
| | - S Förster
- From the Departments of Nuclear Medicine (T.P., S.v.M., S.N., M.S., S.F)
| |
Collapse
|
14
|
Gräbner D, Hoffmann H, Förster S, Rosenfeldt S, Linders J, Mayer C, Talmon Y, Schmidt J. Hydrogels from phospholipid vesicles. Adv Colloid Interface Sci 2014; 208:252-63. [PMID: 24690546 DOI: 10.1016/j.cis.2014.02.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/11/2014] [Accepted: 02/13/2014] [Indexed: 10/25/2022]
Abstract
It is shown that phospholipid dispersions with a few percent of diacylphosphocholine PC in water can be swollen to single-phase lyotropic liquid crystalline Lα-phases by the addition of co-solvents like glycerol, 1,3-butyleneglycol BG or 1,2-propyleneglycol PG. The birefringent Lα-phases contain small unilamellar and multilamellar vesicles if the temperature of the samples is above the Krafft-Temperature Tm of the phospholipid. When such transparent birefringent viscous samples are cooled down below Tm the samples are transformed into birefringent gels. Cryo-TEM and FF-TEM measurements show that the bilayers of the vesicles are transformed from the liquid to the crystalline state during the transformation while the vesicle structure remains. The bilayers of the crystalline vesicles form adhesive contacts in the gel. Pulsed-field gradient NMR measurements show that two different kinds of water or co-solvent can be distinguished in the gels. One type of solvent molecules can diffuse like normal solvent in a continuous bulk phase. A second type of water diffuses much more slowly. This type of solvent is obviously trapped in the vesicles. The permeability of the crystalline vesicles for water and solvent molecules is much lower in the crystalline state than in the fluid state. Maximum swelling of the diacylphosphocholin dispersions occurs when the refractive index of the solvent is matched to the refractive index of the bilayers. The attraction between the bilayers is at a minimum in this state and the liquid crystalline Lα-phase's undulation forces between the bilayers push the bilayers apart. On transformation to the gel state the crystalline bilayers assume a high elastic bending rigidity. Undulations of the bilayers are now suppressed, and the bilayers can form adhesive contacts. Oscillating rheological measurements show that the gels with only 1% of phospholipids can have a storage modulus of 1000Pa. The gels are very brittle. They break when they are deformed by a few percent.
Collapse
|
15
|
Kruk D, Korpała A, Taheri SM, Kozłowski A, Förster S, Rössler EA. 1H relaxation enhancement induced by nanoparticles in solutions: Influence of magnetic properties and diffusion. J Chem Phys 2014; 140:174504. [DOI: 10.1063/1.4871461] [Citation(s) in RCA: 17] [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] [Indexed: 12/27/2022] Open
|
16
|
Abstract
Glioblastoma multiforme (GBM) is the most common and most aggressive primary tumor of the brain. In recent years newer therapeutic approaches have been developed. To allow for an optimized treatment planning it is important to precisely delineate necrotic tissue, edema and vital tumor tissue and to identify the most aggressive parts of the GBM. The magnetic resonance (MR) portion of an MR-positron emission tomography (PET) examination in patients with GBM should consist of both structural and functional sequences including diffusion-weighted and perfusion sequences. The use of (18)F-fluorodeoxyglucose ((18)F-FDG) is limited in patients with gliomas as glucose metabolism is already physiologically high in parts of the brain but (18)F-FDG is nevertheless a commonly used radiopharmaceutical for neuro-oncological questions. (18)F-fluorothymidine reflects the cellular activity of thymidine kinase 1 and correlates with the expression of KI-67 as an index of mitotic activity. The nitroimidazole derivatives (18)F-fluoromisonidazole and (18)F-fluoroazomycin arabinoside ((18)F-FAZA) allow the detection of hypoxic areas within the tumor. In recent years amino acid tracers, such as (18)F-fluoroethyltyrosine are increasingly being used in the diagnosis of gliomas. The simultaneous PET-MR image acquisition allows new approaches, e.g. motion correction by the simultaneous acquisition of MR data with a high temporal resolution and an improved quantification of the PET signal by integrating the results of functional MR sequences. Moreover, the simultaneous acquisition of these two time-consuming methods leads to reduced imaging times for this, often severely ill patient group.
Collapse
Affiliation(s)
- B Ertl-Wagner
- Institut für Klinische Radiologie, Klinikum der Ludwig-Maximilians-Universität, Campus Großhadern, Marchioninistr. 15, 81377 München, Deutschland.
| | | | | | | | | | | | | |
Collapse
|
17
|
Nowidi K, Kunisch R, Bouna-Pyrrou P, Meißner D, Hennig-Fast K, Weindl A, Förster S, Neuhann TM, Falkai P, Berger M, Musil R. [The White man's burden - a case study caught between bipolar affective disorder and Huntington's disease]. Fortschr Neurol Psychiatr 2013; 81:337-345. [PMID: 23612984 DOI: 10.1055/s-0033-1335040] [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] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report upon a case of a 55 year old patient with a bipolar affective disorder, presenting herself with a depressive symptomatology in addition to a severe motor perturbation. The main emphasis upon admittance was perfecting and improving her latest medication. Four weeks prior to her stay at our clinic a thorough neurological examination had taken place in terms of an invalidity pension trial which did not result in any diagnostic findings. Therefore a neurological disease seemed at first highly unlikely. Even though the prior testing was negative, the ensuing neurological examination at our clinic resulted in movement disorders very much indicative of Huntington's Disease. A detailed investigation in regards to the particular family history of the patient was positive for Huntington's Disease. However, whether the patient's mother had also been a genetic carrier of Huntington's Disease was still unknown at the time the patient was admitted to our clinic. It was nevertheless discovered that her mother had also suffered from a bipolar affective disorder. A genetic testing that followed the neurological examination of the patient proved positive for Huntington's Disease. Neuro-imaging resulted in a bicaudate-index of 2.4 (the critical value is 1.8). In a clinical psychological test battery the ensuing results were highly uncommon for patients with solely a bipolar affective disorder people. Under the medical regimen of Quetiapine, Citalopram and Tiaprid the patient's mood could be stabilized and there was some improvement of her motor pertubation.
Collapse
Affiliation(s)
- K Nowidi
- Klinik für Psychiatrie, Ludwig-Maximilians-Universität, München
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
|
19
|
Karasi J, Dziezuk F, Quennery L, Förster S, Reischl U, Colucci G, Schoener D, Seguin-Devaux C, Schmit J. High correlation between the Roche COBAS® AmpliPrep/COBAS® TaqMan® HIV-1, v2.0 and the Abbott m2000 RealTime HIV-1 assays for quantification of viral load in HIV-1 B and non-B subtypes. J Clin Virol 2011; 52:181-6. [DOI: 10.1016/j.jcv.2011.07.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2011] [Revised: 06/01/2011] [Accepted: 07/05/2011] [Indexed: 10/17/2022]
|
20
|
Förster S, Fischer S, Zielske K, Schellbach C, Sztucki M, Lindner P, Perlich J. Calculation of scattering-patterns of ordered nano- and mesoscale materials. Adv Colloid Interface Sci 2011; 163:53-83. [PMID: 21367392 DOI: 10.1016/j.cis.2010.12.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 12/20/2010] [Accepted: 12/28/2010] [Indexed: 11/29/2022]
Abstract
Analytical expressions for the scattering patterns of ordered nano- and mesoscopic materials are derived and compared to measured scattering patterns. Ordered structures comprising spheres (fcc, bcc, hcp, sc, and bct), cylinders (hex and sq), lamellae (lam) and vesicles, as well as bicontinuous cubic structures (Ia3d, Pn3m, and Im3m) are considered. The expressions take into account unit cell dimensions, particle sizes and size distributions, lattice point deviations, finite domain sizes, orientational distributions, core/shell-structures as well a variety of peak shapes. The expressions allow to quantitatively describe, model and even fit measured SAXS and SANS-patterns of ordered or oriented micellar solutions, lyotropic phases, block copolymers, colloidal solutions, nanocomposites, photonic crystals, as well as mesoporous materials.
Collapse
Affiliation(s)
- S Förster
- Physikalische Chemie I, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth, Germany.
| | | | | | | | | | | | | |
Collapse
|
21
|
Förster S, Seichter W, Weber E. Synthesis and Structures of Three- and Hexa-armed Benzene Derivatives Featuring Lateral Benzoic Ester and Benzoic Acid Functions. Z Naturforsch B 2011. [DOI: 10.5560/znb.2011.66b0939] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
22
|
Papadakis CM, Darko C, Di Z, Troll K, Metwalli E, Timmann A, Reiter G, Förster S. Surface-induced breakout crystallization in cylinder-forming P(I-b-EO) diblock copolymer thin films. Eur Phys J E Soft Matter 2011; 34:7. [PMID: 21267706 DOI: 10.1140/epje/i2011-11007-x] [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: 09/02/2010] [Accepted: 12/21/2010] [Indexed: 05/30/2023]
Abstract
We have found very slow crystallization in thin films of cylinder-forming poly(isoprene-b-ethyleneoxide) (P(I-b -EO)) diblock copolymers with PEO being the minority block. The film was crystallized at room temperature after melting at 62 °C. Imaging methods were combined with X-ray reflectometry and grazing-incidence small-angle X-ray scattering and diffraction. Initially, hexagonally packed, amorphous PEO cylinders lie in the film plane. After 148 days, crystallized, finger-like terraces were observed over the entire film surface. The terrace height is 20% higher than the repeat distance in the as-prepared film. Thus, at the film surface, the cylinders have been destroyed by crystalline lamellae lying in the film plane. The PEO chain stems are perpendicular to the substrate surface and are once-folded and fully interdigitated. The substrate-near layers still consist of the hexagonally packed, amorphous PEO cylinders within the PI matrix.
Collapse
Affiliation(s)
- C M Papadakis
- Technische Universität München, Physikdepartment, Fachgebiet Physik weicher Materie/Lehrstuhl für funktionelle Materialien, James-Franck-Str. 1, 85747 Garching, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
23
|
Czihal M, Tatò F, Förster S, Rademacher A, Schulze-Koops H, Hoffmann U. Fever of unknown origin as initial manifestation of large vessel giant cell arteritis: diagnosis by colour-coded sonography and 18-FDG-PET. Clin Exp Rheumatol 2010; 28:549-552. [PMID: 20659410] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Accepted: 04/20/2010] [Indexed: 05/29/2023]
Abstract
OBJECTIVES To evaluate the clinical characteristics and imaging results (CDS, 18-FDG-PET) of patients with large vessel giant cell arteritis (LV-GCA) presenting as fever of unknown origin (FUO). METHODS From a series of 82 patients with GCA we identified 8 patients with FUO as initial disease manifestation. Clinical characteristics and results of CDS and 18-FDG-PET were analysed. Patients with FUO and those with other clinical manifestations of GCA were compared. RESULTS 18-FDG-PET-scans were available for 6/8 patients, revealing enhanced tracer uptake of the thoracic aorta and the aortic branches in all patients. CDS was performed in 8/8 patients, with detection of hypoechogenic wall thickening related to LV-GCA in 7/8 patients. Subjects with FUO were significantly younger (60.9 vs. 69.3 years, p<0.01) and had a stronger humoral inflammatory response (CRP 12.6 vs. 7.1 mg/dl, p<0.01; ESR 110 vs. 71 mm/hour, p<0.01), when compared to the other GCA-patients. CONCLUSIONS LV-GCA should be considered as important differential diagnosis in patients with FUO. In addition to 18-FDG-PET, which is known to be a valuable method in the diagnostic work-up of FUO, we recommend CDS of the supraaortal and femoropopliteal arteries for the initial diagnostic work-up.
Collapse
Affiliation(s)
- M Czihal
- Division of Vascular Medicine, Campus City Center, University Hospital Munich, Germany.
| | | | | | | | | | | |
Collapse
|
24
|
Schneider T, Haase M, Kornowski A, Naused S, Weller H, Förster S, Antonietti M. Synthesis and characterization of PbS nanoparticles in block copolymer micelles. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971011119] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
25
|
Förster S, Rominger A, Saam T, Wolpers S, Nikolaou K, Cumming P, Reiser MF, Bartenstein P, Hacker M. 18F-fluoroethylcholine uptake in arterial vessel walls and cardiovascular risk factors: correlation in a PET-CT study. Nuklearmedizin 2010; 49:148-53. [PMID: 20532464 DOI: 10.3413/nukmed-0299] [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: 03/03/2010] [Accepted: 05/18/2010] [Indexed: 11/20/2022]
Abstract
AIM Fluorine-labelled choline derivatives were recently suggested as agents for visualizing vulnerable atherosclerotic plaques. We therefore aimed to evaluate the association between18F-fluoroethylcholine (FEC) uptake in the wall of large arteries, where calcification was also measured, with the presence of cardiovascular risk factors and occurrence of prior cardiovascular events. PATIENTS, METHODS Detailed clinical information, including common cardiovascular risk factors, was obtained retrospectively in 60 prostate cancer patients examined with whole-body FEC PET-CT. In each patient, we calculated the mean blood pool-corrected SUV, as well as the mean target-to-background ratio (TBR), in addition to the sum of calcified plaques (CPsum) from six major vessels: ascending and descending aorta, aortic arch, abdominal aorta, and both iliac arteries. RESULTS As reported previously, the CPsum correlated significantly with cardiovascular risk factors, in contrast to mean SUV or TBR scores, which did not show any significance with the presence of cardiovascular risk factors. There was no correlation between CPsum, mean TBR or SUV, nor was there any significant association of CPsum, mean TBR or SUV with the prior occurrence of cardio- or cerebrovascular events. CONCLUSION Contrary to a recent report, we found in our rather large cohort of elderly prostate cancer patients no significant association between FEC uptake in large vessels and atherosclerotic plaque burden, or the presence of cardiovascular risk factors. In line with prior reports on structural changes in vessels, increased calcified atherosclerotic plaque burden was strongly associated with the occurrence of common cardiovascular risk factors.
Collapse
Affiliation(s)
- S Förster
- Department of Nuclear Medicine, Ludwig Maximilians University (LMU), Munich, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Abstract
Scatteris a new software for analysis, modeling and fitting of one- and two-dimensional small-angle scattering data of non-ordered, partially ordered or fully ordered nano- and mesoscale structures. The calculations are based on closed analytical expressions for the scattering intensity, enabling efficient evaluation of form factors and structure factors. The software allows one to sequentially fit large series of scattering curves and scattering patterns automatically. It provides further tools for data loading, beam centering, calibration, zooming, binning, lattice identification, calculation of density profiles and size distributions, and visualization of real-space structures. Presentations of experimental and calculated data can be saved as is for presentations or exported for further graphical or mathematical treatment.
Collapse
|
27
|
|
28
|
Abstract
Molecular imaging with ictal and interictal single-photon emission computed tomography (SPECT) as well as positron emission tomography (PET) rank among the established functional imaging tests for the presurgical evaluation of epileptic onset zone in patients with intractable partial epilepsy. In temporal lobe epilepsy the sensitivity of these methods was shown to be excellent, in particular if a multimodal platform is used, which combines the functional imaging with the additional morphological information of magnetic resonance imaging (MRI), but was lower in extra temporal lobe epilepsy. Functional imaging with SPECT and PET reflects seizure related changes of cerebral perfusion, glucose-metabolism and neuroreceptor status. In this review the usefulness of SPECT and PET imaging in clinical routine in epilepsy as well as the role of different neuroreceptor PET-tracer, which were used in epilepsy are discussed. The use of perfusion SPECT tracer allows the investigation of ictal activations, but the low temporal resolution of ictal perfusion SPECT often results in the detection of both the ictal onset zone as well as the propagation pathways, an area that has not always need to be resected in order to render a patient seizure free. The additional use of interictal PET with fluorine-18 fluorodeoxyglucose which measures regional cerebral metabolism or interictal perfusion SPECT enhance the informational value of ictal SPECT and were shown to be important tools to better define the ictal onset and surround inhibition zones. In recent years PET imaging of different cerebral neuroreceptor-systems inter alia GABA(A) receptors, serotonin receptors (5-HT(1A)), opioid receptors as well as dopamine receptors was used to investigate the neurochemical basis of epilepsy, the role of these neurotransmitters for the epileptogenesis as well as the spread of epileptic activity during seizures and partially entered in clinical routine. Currently some of these radioligands are also used to investigate new treatment approaches.
Collapse
Affiliation(s)
- C la Fougère
- Department of Nuclear Medicine, Ludwig Maximilian University of Munich, Marchioninistrasse 15, D-81377 Munich, Germany.
| | | | | | | | | |
Collapse
|
29
|
Abstract
Bundle formation of the vertically oriented polyelectrolytes within polyelectrolyte brushes is studied with x-ray reflectivity and grazing-incidence diffraction as a function of grafting density and ion concentration. At 0.8 Molar monomer concentration and without added salt, a bundle consists of two chains and is 50 A long. On the addition of up to 1M CsCl, the aggregation number increases up to 15 whereas the bundle length approaches a limiting value, 20 A. We suggest that the bundle formation is determined by a balance between long-ranged electrostatic repulsion, whose range and amplitude is decreased on salt addition, and short-ranged attraction.
Collapse
Affiliation(s)
- J U Günther
- Institut für Physik, Universität Greifswald, Felix-Hausdorff-Str. 6, D-17487 Greifswald, Germany
| | | | | | | |
Collapse
|
30
|
Klar E, Förster S. Kommentar auf Anforderung der Schriftleitung. Zentralbl Chir 2008. [DOI: 10.1055/s-2008-1004755] [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: 10/22/2022]
|
31
|
Zahradnik E, Sander I, Buschmann A, Mayer S, Brüning T, Raulf-Heimsoth M, Blank S, Seismann H, Bockisch B, Cifuentes L, Ring J, Grunwald T, Ollert M, Spillner E, Blume C, Förster S, Petersen A, Becker W, Behrendt H, Traidl-Hoffmann C, Röschmann K, Ulmer A, Zeitvogel J, Werfel T, Wittmann M, Mommert S, Gschwandtner M, Dijkstra D, Gutzmer R. Vorträge. Allergo J 2007. [DOI: 10.1007/bf03370553] [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: 10/21/2022]
|
32
|
Teich R, Blümer N, Patrascan C, Heine H, Holst O, Garn H, Renz H, Debarry J, Hanuszkiewicz A, Stein K, Mages J, Lang R, Sabri A, Braren I, Mempel M, Bredehorst R, Ollert M, Spillner E, Rasche C, Wolfram C, Zuberbier T, Worm M, Röschmann K, Ulmer A, Petersen A, Goldmann T, Schramm G, Mohrs K, Wodrich M, Doenhoff M, Pearce E, Haas H, Mohrs M, Darcan Y, Meinicke H, Fels G, Hegend O, Henke W, Hamelmann E, Blume C, Förster S, Gilles S, Becker W, Ring J, Behrendt H, Traidl-Hoffmann C, Edele F, Molenaar R, Reinhold C, Gütle D, Dudda J, Homey B, Mebius R, Hornef M, Martin S, Albrecht M, Suezer Y, Staib C, Sutter G, Vieths S, Reese G, Sudowe S, Zindler E, Gehrke N, Reuter S, Neufurth M, Finotto S, Taube C, Reske-Kunz A, Meyer HA, Krokowski M, Heidt C. Experimentelle Allergologie/Immunologie. Allergo J 2007. [DOI: 10.1007/bf03370607] [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: 10/21/2022]
|
33
|
Haug A, Schmidt G, Hacker M, Förster S, Weiss M, Hahn K, Tiling R. Mycotic aneurysm of the thoracic aorta detected by FDG-PET. Nuklearmedizin 2007; 46:N43. [PMID: 17768781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Affiliation(s)
- A Haug
- Department of Nuclear Medicine, Ludwig-Maximilians-Univeristy of Munich, Germany
| | | | | | | | | | | | | |
Collapse
|
34
|
Geissler HJ, Fischer UM, Antonyan A, Förster S, Addicks K, Wahlers T, Mehlhorn U, Bloch W. Bradykinin and NONOate reduce apoptosis in cryopreserved human allografts during the thawing process. Thorac Cardiovasc Surg 2007. [DOI: 10.1055/s-2007-967425] [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: 10/21/2022]
|
35
|
Förster S, Weiss M, Haug A, Krötz M, Tiling R, Schober A, Hacker M. Myocardial perfusion defects due to irregular wall motion detected by 99mTc-sestamibi gated SPECT in a patient with constrictive pericarditis. Nuklearmedizin 2007; 46:N26-7. [PMID: 17566234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Affiliation(s)
- S Förster
- Department of Nuclear Medicine, University of Munich, Germany
| | | | | | | | | | | | | |
Collapse
|
36
|
Breitkopf C, Papp H, Li X, Olindo R, Lercher JA, Lloyd R, Wrabetz S, Jentoft FC, Meinel K, Förster S, Schindler KM, Neddermeyer H, Widdra W, Hofmann A, Sauer J. Activation and isomerization of n-butane on sulfated zirconia model systems—an integrated study across the materials and pressure gaps. Phys Chem Chem Phys 2007; 9:3600-18. [PMID: 17612725 DOI: 10.1039/b701854a] [Citation(s) in RCA: 19] [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] [Indexed: 11/21/2022]
Abstract
Butane activation has been studied using three types of sulfated zirconia materials, single crystalline epitaxial films, nanocrystalline films, and powders. A surface phase diagram of zirconia in interaction with SO(3) and water was established by DFT calculations, which was verified by LEED investigations on single-crystalline films and by IR spectroscopy on powders. At high sulfate surface densities a pyrosulfate species is the prevailing structure in the dehydrated state; if such species are absent, the materials are inactive. Theory and experiment show that the pyrosulfate can react with butane to give butene, H(2)O and SO(2), hence butane can be activated via oxidative dehydrogenation. This reaction occurred on all investigated materials; however, isomerization could only be proven for powders. Transient and equilibrium adsorption measurements in a wide pressure and temperature range (isobars measured via UPS on nanocrystalline films, microcalorimetry and temporal analysis of products measurements on powders) show weak and reversible interaction of butane with a majority of sites but reactive interaction with <5 micromol g(-1) sites. Consistently, the catalysts could be poisoned by adding sodium to the surface in a ratio S/Na = 35. Future research will have to clarify what distinguishes these few sites.
Collapse
Affiliation(s)
- C Breitkopf
- Universität Leipzig, Institut für Technische Chemie, Linnéstrasse 3, 04103, Leipzig, Germany
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Mittag N, Förster S, Hoppe S, Simat TJ, Sehr A, Renz S, Vobach M, Kammann U. Bioassay Guided Analysis of Migrants from Can Coatings. J Verbrauch Lebensm 2006. [DOI: 10.1007/s00003-006-0057-7] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
38
|
Meinel K, Hofmann A, Förster S, Kulla R, Schindler KM, Neddermeyer H, Sauer J, Widdra W. Interaction of SO3 with c-ZrO2(111) films on Pt(111). Phys Chem Chem Phys 2006; 8:1593-600. [PMID: 16633644 DOI: 10.1039/b516190h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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
Single-crystalline sulfated c-ZrO2(111) films of the cubic (c) type have been prepared by reactive deposition of Zr onto Pt(111) in an O2 atmosphere and subsequent exposition to a SO3 atmosphere. The morphology, atomic structure, and composition have been examined by scanning tunneling microscopy, low-energy electron diffraction (LEED), Auger electron spectroscopy, and density functional theory (DFT) calculations. The clean c-ZrO2(111) films display a (2x2) surface structure. During SO3 exposure at room temperature, a clear (radical3xradical3)R30 degrees structure develops. At about 700 K, the SO3-induced (radical3xradical3)R30 degrees structure disappears and the bright (2x2) LEED pattern of the clean ZrO2 films reappears. The energies of plausible c-ZrO2(111)/SO3 structures have been examined by DFT. The (radical3xradical3)R30 degrees structure found in the experiments turned out to be the most stable one for temperatures below 700 K. At temperatures around 700 K, a disordered low coverage structure may exist, which can not be observed by conventional LEED. A comparison of cubic zirconia surfaces with the alternative tetragonal system yields similar results for the SO3 adsorption in the DFT calculations and shows that c-ZrO2 surfaces are good models for the industrial used tetragonal ZrO2 supports.
Collapse
Affiliation(s)
- K Meinel
- Martin-Luther-Universität Halle-Wittenberg, FB Physik, D-06099, Halle, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
39
|
Hermsdorf N, Stamm M, Förster S, Cunis S, Funari SS, Gehrke R, Müller-Buschbaum P. Self-supported particle-track-etched polycarbonate membranes as templates for cylindrical polypyrrole nanotubes and nanowires: an X-ray scattering and scanning force microscopy investigation. Langmuir 2005; 21:11987-93. [PMID: 16316143 DOI: 10.1021/la0515975] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Self-supported particle-track-etched polycarbonate membranes with nearly perfect cylindrical pores are used for the preparation of similarly perfect cylindrical polypyrrole nanowires and nanotubes. A complete investigation of the structural properties that result at different stages of the preparation route of polypyrrole nanowires and nanotubes is based on a combination of real and reciprocal space techniques. Nanoporous membranes with nominal pore size ranging from 5 to 150 nm and pore density up to 10(9) pores/cm(2) made from 21-microm-thick polycarbonate films are used. Polypyrrole nanotubes or nanowires are synthesized inside the pores. A real-space picture of the nanomaterial results from scanning force microscopy (SFM) on ultrathin sections made in two directions to obtain structures in the sample surface as well as perpendicular to the surface. From a model-based fit to the small-angle and ultra-small-angle X-ray scattering (SAXS/USAXS) data, the geometric pore structure is obtained and compared to values determined with scanning electron microscopy (SEM). Nanopores, nanowires, and nanotubes are described by uniform solid cylinders or hollow tubes, which are oriented highly parallel to each other and exhibit a small size distribution. Below a critical pore diameter, solid nanowires are produced whereas above this limit hollow nanotubes result.
Collapse
Affiliation(s)
- N Hermsdorf
- Institut für Polymerforschung Dresden, Germany
| | | | | | | | | | | | | |
Collapse
|
40
|
Altstetter C, Bauch M, Bauernfeind R, Förster S, Mertig G, Paulsteiner F, Polz I, Schwarzeit R. [Priorities in personnel management]. Pflege Aktuell 2005; 59:480-1. [PMID: 16167585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
|
41
|
Förster S, Liu X, Adam U, Schareck WD, Hopt UT. Islet autotransplantation combined with pancreatectomy for treatment of pancreatic adenocarcinoma: a case report. Transplant Proc 2005; 36:1125-6. [PMID: 15194392 DOI: 10.1016/j.transproceed.2004.04.048] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Extensive pancreatectomy (EP) may increase the resection rate of pancreatic adenocarcinoma (PA). Unfortunately, EP often results in unstable diabetes. Recently, islet autotransplantation (auto-Tx) has offered the potential to prevent this metabolic disorder. Because of the fear of contamination of prepared islets by malignant cells, this procedure has so far not been used as a treatment for PA. We herein report a case of a 63-year-old nondiabetic patient who underwent EP combined with islet auto-Tx in an emergency operation following histologically proved R(0)-resection for PA (pT(3)pN(1)G(2)). Islets were isolated from the excised pancreas using a continuous digestion filtration device. The resultant preparation was injected into the portal vein. Owing to the moderate fasting hyperglycemia, postoperative exogenous insulin therapy was necessary (26 U/d). After discharge, the patient's daily insulin dose was gradually reduced. At 1-year follow-up the fasting C-peptide level was 0.66 ng/mL, and an oral glucose tolerance test (oGTT) and an intravenous (IV) glucagon stimulation (GS) showed functioning engrafted islets. The K-ras mutations were detected in the paraffin-embedded PA, but not in the prepared islets or in the peripheral blood. Computed tomographic (CT) imaging revealed neither local tumor recurrence nor liver metastases. At 2-year follow-up, the patient was on a balanced food regimen and gaining weight. Although he remains insulin-dependent (16 U/d), he is metabolically stable (HbA(1)(c) 5.9%). The fasting C-peptide level is 0.68 ng/mL. The peak value of C-peptide in response to oGTT was 0.92 ng/mL and to GS 0.89 ng/mL. At this time Ca19-9 and CEA are increased to 35.3 U/mL and 19.2 ng/mL, respectively. The patient died 2.5 years after operation owing to tumor recurrence. There was no evidence for liver metastases. We postulate that histologic evaluation (R(0)-resection) and detection of K-ras mutations may be useful techniques. However, islet auto-Tx after EP for adenocarcinoma should only be regarded for rescue therapy. Studies on strategies to exclude possible contamination of islet tissue with carcinoma cells are critically important.
Collapse
Affiliation(s)
- S Förster
- Department of General Surgery, University of Rostock, Rostock, Germany
| | | | | | | | | |
Collapse
|
42
|
Förster S, Opitz B, Hocke AC, Maass M, Suttorp N, Krüll M. Zellaktivierung durch Chlamydophila pneumoniae über zytoplasmatische Rezeptoren der „innate immunity“. Pneumologie 2005. [DOI: 10.1055/s-2005-864254] [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: 10/19/2022]
|
43
|
Püschel A, Opitz B, Förster S, Beermann W, van Laak V, Schmeck B, Chakraborty T, Suttorp N, Hippenstiel S. Intrazelluläre Bakterien aktivieren p38- und pp42/44-MAPK sowie die IL-8-Sekretion über Nod1. Pneumologie 2005. [DOI: 10.1055/s-2005-864253] [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: 10/19/2022]
|
44
|
Abstract
Shear thinning and orientation of cylindrical surfactant and block copolymer micelles was investigated by rheo-SANS (small-angle neutron scattering) experiments. Shear thinning and orientation occur for shear rates (.)gamma tau(dis)>>1, where tau(dis) is the disentanglement time of the micelles. Micelles align in the flow direction with an orientational distribution that can be well described by an Onsager-type distribution function. Over nearly the whole range of concentrations and for all cylindrical micelles investigated, the shear viscosity eta follows a simple eta approximately e(-aS) behavior as a function of the orientational order parameter S with the same prefactor a.
Collapse
Affiliation(s)
- S Förster
- Institut für Physikalische Chemie, Universität Hamburg, D-20146 Hamburg, Germany
| | | | | |
Collapse
|
45
|
Abstract
Analytical expressions for the scattering functions of ordered mesoscopic materials are derived and compared to experimentally determined scattering curves. Ordered structures comprising spheres (fcc, bcc, hcp, sc), cylinders (hex, sq), and lamellar structures are considered. The expressions take into account particle size distributions and lattice point deviations, domain size, core/shell structures, as well as peak shapes varying analytically between Lorentzian and Gaussian functions. The expressions allow one to quantitatively describe high-resolution synchrotron small-angle X-ray (SAXS) and neutron scattering (SANS) curves from lipid and block copolymer lyotropic phases, core/shell nanoparticle superstructures, ordered nanocomposites, and ordered mesoporous materials. In addition, the diffuse out-of-plane scattering of grazing incidence GISAXS and GISANS experiments of laterally ordered thin films can be quantitatively analyzed.
Collapse
Affiliation(s)
- S Förster
- Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, D-20146 Hamburg, Germany
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Ahrens H, Büscher K, Eck D, Förster S, Luap C, Papastavrou G, Schmitt J, Steitz R, Helm C. Poly(styrene sulfonate) self-organization: electrostatic and secondary interactions. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/masy.200450707] [Citation(s) in RCA: 22] [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]
|
47
|
Geissler HJ, Bloch W, Förster S, Mehlhorn U, Krahwinkel A, Kroener A, Addicks K, deVivie ER. Morphology and density of initial lymphatics in human myocardium determined by immunohistochemistry. Thorac Cardiovasc Surg 2004; 51:244-8. [PMID: 14571339 DOI: 10.1055/s-2003-43080] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Myocardial edema is a common finding in congestive heart failure, transplant rejection, and cardiomyopathy. Although pathological alterations in the lymphatic morphology are part of the underlying disease, knowledge on these changes is limited. However, lymphatic morphology may be investigated by immunohistochemical staining for fms-like tyrosine 4 kinase (flt-4), which is specific for lymphatic endothelium in adult tissue. METHODS We used myocardial tissue of ventricular out flow tract taken from five human semilunar valves harvested as allografts but unsuitable for implantation for analysis, performing immunohistochemical staining for flt-4 with a commercially available antibody. Lymphatic morphometry was completed according Gundersen method. RESULTS Immunohistochemical staining for flt-4 resulted in successful labeling of lymph capillaries in adult human myocardium. Lymph capillary density was calculated as 50.7 +/- 12.5 per mm2 and average diameter was 3.7 +/- 0.7 microm. Conclusions. Lymph capillary morphology in human myocardium may be successfully determined by immunohistochemical staining for flt-4. Tissue samples as small as myocardial biopsies may be used for analysis. Using this method, morphological changes in myocardial lymphatics may be investigated in various cardiovascular diseases.
Collapse
Affiliation(s)
- H J Geissler
- Department of Cardiothoracic Surgery, University of Cologne, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
48
|
Förster S. [Veterinary authorities and animal welfare organizations--is cooperation possible?]. Dtsch Tierarztl Wochenschr 2003; 110:199-205. [PMID: 12822254] [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] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
Veterinarians and private animal welfare workers both work for the importance of animal welfare in our society. Although both work for a common cause, co-operation and communication between the veterinary administration and animal welfare members is often difficult. This paper will demonstrate the cause of problems between the two bodies and the benefits of co-operation will be assessed. Strategies to optimise the co-operation between the veterinary administration and animal rights organisations will be described using the local district Kleve as an example. Experiences with the animal welfare societies in this region will be illustrated with the aim to show the important supporting possibilities of the animal rights organisations to back the official authorities activities. Also the need to encourage the partly disappointing co-operation between these two bodies with the exchange of information would be beneficial for both bodies.
Collapse
Affiliation(s)
- S Förster
- Kreis Kleve, Fachbereich Gesundheit, Abteilung Veterinärangelegenheiten, Kleve.
| |
Collapse
|
49
|
Birthelmer A, Ehret A, Amtage F, Förster S, Lehmann O, Jeltsch H, Cassel JC, Jackisch R. Neurotransmitter release and its presynaptic modulation in the rat hippocampus after selective damage to cholinergic or/and serotonergic afferents. Brain Res Bull 2003; 59:371-81. [PMID: 12507688 DOI: 10.1016/s0361-9230(02)00930-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
UNLABELLED Male Long-Evans rats sustained injections of 5,7-dihydroxytryptamine (5,7-DHT) into the fimbria-fornix and the cingular bundle or/and intraseptal injections of 192 IgG-saporin to induce serotonergic or/and cholinergic hippocampal denervations; Sham-operated rats served as controls. Four to ten weeks after lesioning, we measured (i). the electrically evoked release of acetylcholine ([3H]ACh), noradrenaline ([3H]NA) and serotonin ([3H]5-HT) in hippocampal slices in the presence of drugs acting on auto- or heteroreceptors, (ii). the nicotine-evoked release of NA and (iii). the choline acetyltransferase (ChAT) activity and the concentration of monoamines in homogenates. Saporin lesions reduced the accumulation of [3H]choline, the release of [3H]ACh and the ChAT activity, but increased the concentration of NA and facilitated the release of [3H]NA evoked by nicotine. 5,7-DHT lesions reduced the accumulation and the release of [3H]5-HT, the concentration of 5-HT, and also facilitated the release of [3H]NA evoked by nicotine. Accumulation and electrically evoked release of [3H]NA were not altered by either lesion. The combination of both toxins resulted in an addition of their particular effects. The 5-HT(1B) receptor agonist, CP 93129, and the muscarinic agonist, oxotremorine, reduced the release of [3H]ACh in control and 5,7-DHT-lesioned rats; in rats injected with saporin, their effects could not be measured reliably. CP 93129 and the alpha(2)-adrenoceptor agonist, UK 14304, reduced the release of [3H]5-HT in all groups by about 65%. IN CONCLUSION (i). selective neurotoxins can be combined to enable controlled and selective damage of hippocampal transmitter systems; (ii). 5-HT exerts an inhibitory influence on the nicotine-evoked release of NA, but partial serotonergic lesions do not influence the release of ACh at a presynaptic level and (iii). presynaptic modulatory mechanisms involving auto- and heteroreceptors may be conserved on fibres spared by the lesions.
Collapse
Affiliation(s)
- A Birthelmer
- Institut für Experimentelle und Klinische Pharmakologie und Toxikologie der Universität Freiburg, Neuropharmakologisches Labor, Hansastrasse, Germany
| | | | | | | | | | | | | | | |
Collapse
|
50
|
Abstract
Cell wall materials (CWM) prepared from apple parenchyma tissue by treatment with commercial enzymes for maceration, mash fermentation and liquefaction were characterised with regard to their composition and structure as well as their physicochemical and physiological properties. Increasing enzymatic degradation of the CWM resulted in growing loss of the pectin matrix, decreasing porosity as well as increasing particle aggregation. Due to these structural alterations the water binding, the viscoelastic properties of the CWM-water-suspensions and the in vitro fermentation, forming short chain fatty acids, were reduced. The investigations showed that interrelations exist between enzymatic treatment and changes of (i) structure and state of matrices (evaluated by means of thermal analysis), (ii) physicochemical properties and (iii) physiological properties. So the application of liquefying enzymes can lead to a complete removal of the pectin matrix, causing an essentially improved thermal stability of the CWM preparation, but strongly reduced water binding and reduced structure-forming properties into the CWM-water-suspensions. The formation of short-chain fatty acids during in vitro fermentation of the CWM preparations by fresh human faeces flora depended on the portion and the state of the pectin matrix and the cellulose network, respectively.
Collapse
Affiliation(s)
- S Förster
- Technische Universität Berlin, Institute of Food Technology, Food Functionality, Berlin, Germany
| | | | | |
Collapse
|