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Weihs A, Bi H, Bülow R, Eickhoff S, Ewert R, Frenzel S, Grabe H, Hoffstaedter F, Jahanshad N, Khazaie H, Patil K, Riemann D, Rostampour M, Schiel J, Spiegelhalder K, Stubbe B, Thomopoulos S, Thompson P, Valk S, Völzke H, Zarei M, Tahmasian M. Lack of structural brain alteration associated with insomnia: Findings from the ENIGMA-Sleep working group. Sleep Med 2022. [DOI: 10.1016/j.sleep.2022.05.351] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kelley ST, Liu W, Quintana PJ, Hoh E, Dodder NG, Mahabee-Gittens EM, Padilla S, Ogden S, Frenzel S, Sisk-Hackworth L, Matt GE. Altered microbiomes in thirdhand smoke-exposed children and their home environments. Pediatr Res 2021; 90:1153-1160. [PMID: 33654287 PMCID: PMC8410873 DOI: 10.1038/s41390-021-01400-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 12/29/2020] [Accepted: 01/06/2021] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Tobacco smoke contains numerous toxic chemicals that accumulate in indoor environments creating thirdhand smoke (THS). We investigated if THS-polluted homes differed in children's human and built-environment microbiomes as compared to THS-free homes. METHODS Participants were n = 19 THS-exposed children and n = 10 unexposed children (≤5 years) and their caregivers. Environmental and biological samples were analyzed for THS pollutants and exposure. Swab samples were collected from the built-environment (floor, table, armrest, bed frame) and child (finger, nose, mouth, and ear canal), and 16S ribosomal RNA genes were analyzed for bacterial taxa using high-throughput DNA sequencing. RESULTS Phylogenetic α-diversity was significantly higher for the built-environment microbiomes in THS-polluted homes compared to THS-free homes (p < 0.014). Log2-fold comparison found differences between THS-polluted and THS-free homes for specific genera in samples from the built-environment (e.g., Acinetobacter, Bradyrhizobium, Corynebacterium, Gemella, Neisseria, Staphylococcus, Streptococcus, and Veillonella) and in samples from children (esp. Corynebacterium, Gemella, Lautropia, Neisseria, Rothia, Staphylococcus, and Veillonella). CONCLUSION When exposed to THS, indoor and children microbiomes are altered in an environment-specific manner. Changes are similar to those reported in previous studies for smokers and secondhand smoke-exposed persons. THS-induced changes in child and built-environmental microbiomes may play a role in clinical outcomes in children. IMPACT Despite smoking bans, children can be exposed to tobacco smoke residue (i.e., thirdhand smoke) that lingers on surfaces and in settled house dust. Thirdhand smoke exposure is associated with changes in the microbiomes of the home environment and of the children living in these homes. Thirdhand smoke is associated with increased phylogenetic diversity of the home environment and changes in the abundances of several genera of the child microbiome known to be affected by active smoking and secondhand smoke (e.g., Corynebacterium, Staphylococcus, Streptococcus). Thirdhand smoke exposure by itself may induce alterations in the microbiome that play a role in childhood pathologies.
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Affiliation(s)
| | - William Liu
- San Diego State University, San Diego CA, USA
| | | | - Eunha Hoh
- San Diego State University, San Diego CA, USA
| | | | - E. Melinda Mahabee-Gittens
- Cincinnati Children’s Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH, U.S.A
| | | | - Shawn Ogden
- San Diego State University, San Diego CA, USA
| | - Sia Frenzel
- San Diego State University, San Diego CA, USA
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Weihs V, Heel V, Dedeyan M, Lang NW, Frenzel S, Hajdu S, Heinz T. Age and traumatic brain injury as prognostic factors for late-phase mortality in patients defined as polytrauma according to the New Berlin Definition: experiences from a level I trauma center. Arch Orthop Trauma Surg 2021; 141:1677-1681. [PMID: 33070209 PMCID: PMC8437859 DOI: 10.1007/s00402-020-03626-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 09/30/2020] [Indexed: 10/29/2022]
Abstract
BACKGROUND The rationale of this study was to identify independent prognostic factors influencing the late-phase survival of polytraumatized patients defined according to the New Berlin Definition. METHODS Retrospective data analysis on 173 consecutively polytraumatized patients treated at a level I trauma center between January 2012 and December 2015. Patients were classified into two groups: severely injured patients (ISS > 16) and polytraumatized patients (patients who met the diagnostic criteria for the New Berlin Definition). RESULTS Polytraumatized patients showed significantly lower late-phase and overall survival rates. The presence of traumatic brain injury (TBI) and age > 55 years had a significant influence on the late-phase survival in polytraumatized patients but not in severely injured patients. Despite the percentage of severe TBI being nearly identical in both groups, severe TBI was identified as main cause of death in polytraumatized patients. Furthermore, severe TBI remains the main cause of death in polytraumatized patients > 55 years of age, whereas younger polytraumatized patients (< 55 years of age) tend to die more often due to the acute trauma. CONCLUSION Our results suggest that age beyond 55 years and concomitant (severe) TBI remain as most important influencing risk factor for the late-phase survival of polytraumatized patients but not in severely injured patients. LEVEL OF EVIDENCE Prognostic study, level III.
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Affiliation(s)
- V. Weihs
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - V. Heel
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - M. Dedeyan
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - N. W. Lang
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - S. Frenzel
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - S. Hajdu
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - T. Heinz
- grid.22937.3d0000 0000 9259 8492Department of Orthopedics and Trauma Surgery, Division of Trauma Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
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Klinger-König J, Frenzel S, Wittfeld K, Van der Auwera S, Homuth G, Hannemann A, Bülow R, Völzke H, Grabe HJ. Cortisol, aging and the influence on brain age. PHARMACOPSYCHIATRY 2020. [DOI: 10.1055/s-0039-3403001] [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] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- J Klinger-König
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - S Frenzel
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - K Wittfeld
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - S Van der Auwera
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - G Homuth
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - A Hannemann
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - R Bülow
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - H Völzke
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
| | - HJ Grabe
- Universitätsmedizin Greifswald, Klinik und Poliklinik für Psychiatrie und Psychotherapie, Germany
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Grab M, Frenzel S, Baumann A, Kramer H, Fabry T, Peter S, Pichlmaier M, Haas N, Hagl C, Thierfelder N. Development and Evaluation of 3D-Printed Aortic Phantoms for Multimodal Patient-Specific Therapy Planning. Thorac Cardiovasc Surg 2019. [DOI: 10.1055/s-0039-1678907] [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: 10/27/2022]
Affiliation(s)
- M. Grab
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
- TU München, Lehrstuhl für Medizintechnik, Garching, Germany
| | - S. Frenzel
- TU München, Lehrstuhl für Medizintechnik, Garching, Germany
| | - A. Baumann
- LMU München, Klinik und Poliklinik für Radiologie, München, Germany
| | - H. Kramer
- LMU München, Klinik und Poliklinik für Radiologie, München, Germany
| | - T. Fabry
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
| | - S. Peter
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
| | - M. Pichlmaier
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
| | - N. Haas
- LMU München, Kinderkardiologie und Pädiatrische Intensivmedizin, München, Germany
| | - C. Hagl
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
| | - N. Thierfelder
- LMU München, Herzchirurgische Klinik und Poliklinik, München, Germany
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Hertel J, Frenzel S, König J, Wittfeld K, Füllen G, Pietzner M, Völzke H, Grabe H. MEASURING BIOLOGICAL AGE AS A TASK OF INDIVIDUALIZATION: A FRAMEWORK FOR PREDICTOR SELECTION AND MODEL VALIDATION. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.3118] [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: 11/13/2022] Open
Affiliation(s)
- J Hertel
- University Medicine Greifswald, Greifswald, Mecklenburg-Vorpommern, Germany
| | - S Frenzel
- University Medicine Greifswald, Department of Psychiatry and Psychotherapy, Germany
| | - J König
- University Medicine Greifswald, Department of Psychiatry and Psychotherapy, Germany
| | - Katharina Wittfeld
- German Center for Neurodegenerative Diseases (DZNE), Partner Site Greifswald/Rostock, Germany
| | - G Füllen
- Rostock University Medical Center, Institute for Biostatistics and Informatics in Medicine and Ageing Research, Germany
| | - M Pietzner
- Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald, Germany
| | - H Völzke
- Institute for Community Medicine, University Medicine Greifswald, Germany
| | - H Grabe
- University Medicine Greifswald, Department of Psychiatry and Psychotherapy, Germany
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Sack M, Sigler J, Frenzel S, Eing C, Arnold J, Michelberger T, Frey W, Attmann F, Stukenbrock L, Müller G. Research on Industrial-Scale Electroporation Devices Fostering the Extraction of Substances from Biological Tissue. Food Eng Rev 2010. [DOI: 10.1007/s12393-010-9017-1] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Wershofen H, Bieringer J, Frenzel S, Kanisch G, Katzlberger C, Steinkopff T, Tschiersch J, Völkle H. An inter-laboratory comparison of low-level measurements in ground-level aerosol monitoring. Appl Radiat Isot 2008; 66:737-41. [DOI: 10.1016/j.apradiso.2008.02.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Steinkopff T, Dyck W, Frank G, Frenzel S, Salvamoser J. The measurement of radioactive noble gases by DWD in the frame of the Global Atmospheric Watch programme of WMO. Appl Radiat Isot 2004; 61:225-30. [PMID: 15177349 DOI: 10.1016/j.apradiso.2004.03.050] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The Deutscher Wetterdienst (DWD, German Meteorological Service) is integrated into the Global Atmospheric Watch programme (GAW) of the World Meteorological Organization (WMO). According to this programme a variety of chemical compounds and radionuclides are measured at global stations. At the research platform "Schneefernerhaus" 7Be, 222Rn, and its decay products, 14C in CO2, tritium as HTO, 85Kr and 133Xe are continuously monitored by the DWD or are sampled and then measured at the central laboratory in Offenbach. The results are used as additional information for studying atmospheric mixing processes or on the other hand as information about the background level of radioactivity. As a main subject of this paper the integration and partly the optimization of sampling and measuring procedures for the detection of noble gases are described. In particular, the methods of quality assurance are discussed for Kr and Xe.
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Affiliation(s)
- T Steinkopff
- Deutscher Wetterdienst, Frankfurter Strasse 135, Offenbach 63067, Germany.
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Frenzel S, Apel TW, Heidemann PH, Zerres K, Neumann HP, Dörr HG. Phaeochromocytoma associated with a de novo VHL mutation as form fruste of von Hippel-Lindau disease. Eur J Pediatr 2001; 160:421-4. [PMID: 11475579 DOI: 10.1007/s004310100758] [Citation(s) in RCA: 6] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
UNLABELLED Phaeochromocytomas usually occur sporadically but may be associated with dominant inherited cancer syndromes such as multiple endocrine neoplasia type 2 (MEN 2), von Hippel-Lindau disease (VHL) and type 1 neurofibromatosis. We report on a boy presenting at age 8 years with an isolated benign phaeochromocytoma of the left adrenal. Three years later a second adrenal phaeochromocytoma was diagnosed on the right side and removed. His family history was negative. Genetic analysis did not show a mutation in the MEN 2 susceptible proto-oncogene rearranged during transfection; however, we found a germline missense mutation in the VHL gene (nucleotide 695 G to A transversion) which has been described only twice before in the literature. Both parents had normal (wild type) VHL copies indicating that our patient had a de novo germline VHL mutation. Careful clinical evaluation of the patient at 18 years did not reveal any other manifestations of VHL disease. CONCLUSION Carriers of von Hippel-Lindau germline mutations can present with a form fruste of von Hippel-Lindau disease presenting initially with unilateral phaeochromocytoma and therefore mutation analysis should be carried out.
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Affiliation(s)
- S Frenzel
- Division of Paediatric Endocrinology, University Hospital for Children and Adolescents, Loschgestrasse 15, 91054 Erlangen, Germany.
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Grünewald T, Frenzel S, Decker M, Lindner B, Sultzer R, von Eichel-Streiber C, Ruf BR. [Nosocomial epidemiology and transmission of Clostridium difficile infection]. Dtsch Med Wochenschr 2001; 126:519-22. [PMID: 11381634 DOI: 10.1055/s-2001-13295] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [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: 10/17/2022]
Abstract
BACKGROUND Clostridium difficile is of growing importance as a hospital-acquired pathogen. Pseudomembraneous colitis is the main clinical disease. Transmission and epidemiological features are not yet fully understood. PATIENTS AND METHODS Stool samples from 1164 individuals (571 women and 593 men) attending were examined for the presence of C. difficile. Follow-up examinations and molecular typing methods were used for the detection nosocomial transmissions. Additionally, hospital-borne environmental samples as well as staff samples were tested. RESULTS Incidence of C. difficile infection was 8.4%. Nearly all patients (92.9%) had antibiotics given. Using molecular typing nosocomial transmission was evident. Though, environmental samples in general had a low positivity, toilet chairs were contaminated in 15.4% and may be a potential source of transmission. Staff was positive in only one case. CONCLUSIONS Prevention of infections with C. difficile becomes to be a major threat for the clinical and hygienic management.
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Affiliation(s)
- T Grünewald
- 2. Klinik für Innere Medizin, Klinikum St. Georg Leipzig
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13
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Frenzel S, Dörr HG. [Problems of delayed diagnosis of an uncomplicated adrenogenital syndrome (AGS) with 21-hydroxylase defect in a 7-year-old boy]. Dtsch Med Wochenschr 1998; 123:827-31. [PMID: 9685841 DOI: 10.1055/s-2007-1024074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 02/08/2023]
Abstract
HISTORY AND CLINICAL FINDINGS A 7.3-year-old boy was presented at out-patient clinic because of tallness and premature puberty. His height was 150.2cm (+ 4.74 standard deviation score for chronological age), body mass index 18.4 kg/m2, pubic hair stage 3 (after Tanner), testicular volume of 5.0 ml each. Bone age was accelerated by 6.5 years (SD -1.55 for height according to bone age). Expected final height was 166 cm, mean genetic target height 180 cm. INVESTIGATIONS Basal serum concentration of 17-hydroxyprogesterone was 142.1 ng/ml (normal: < 1.9) and testosterone of 93 ng/dl (normal: < 11). 24-hour urine showed an increased excretion of pregnantriol of 8280 micrograms/d (normal < 500). Gonadotropine-releasing hormone test (GnRH), blood collected at 0 and 30 min, showed an increased rise of the serum LH concentration of 0.6 to 8.2 mU/ml (normal < 0.3 and < 3.6, respectively) and a normal FSH increase of 1.3 to 3.2 mU/ml (normal < 1.3 and < 4.0, respectively). The diagnosis of adrenogenital syndrome (AGS) with 21-hydroxylase defect was confirmed by molecular genetic testing. TREATMENT AND COURSE The boy was treated with hydrocortisone (average dose 18.3 mg/m2 body surface area). Because of the premature puberty and the poor growth endprognosis treatment with the GnRH agonist Decapeptyl Depot, 3.75 mg every 4 weeks i.m., was started. CONCLUSION The correct diagnosis should have been made in the neonatal period on the basis of the family history (15-year-old brother with AGS) and at the latest on correct interpretation of the clinical signs during early childhood.
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Affiliation(s)
- S Frenzel
- Klinik mit Poliklinik für Kinder und Jugendliche, Friedrich-Alexander-Universität Erlangen-Nürnberg
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Christgau M, Palitzsch KD, Schmalz G, Kreiner U, Frenzel S. Healing response to non-surgical periodontal therapy in patients with diabetes mellitus: clinical, microbiological, and immunologic results. J Clin Periodontol 1998; 25:112-24. [PMID: 9495610 DOI: 10.1111/j.1600-051x.1998.tb02417.x] [Citation(s) in RCA: 168] [Impact Index Per Article: 6.5] [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: 02/06/2023]
Abstract
The aim of the present study was to monitor clinical, microbiological, medical, and immunological effects of non-surgical periodontal therapy in diabetics and healthy controls. 20 IDDM (insulin dependent, n = 7) or NIDDM (non-insulin dependent, n = 13) diabetic patients (median duration 11.5 years, range of HbA1C: 4.4-10.6%) with moderate to advanced periodontal disease and 20 matched healthy control patients, were subjected to supragingival pretreatment and subsequent subgingival therapy. Periodontal examinations (API, PBI, BOP, PPD, PAL), microbiological examinations (culture), medical routine examinations, and immunological examinations (oxidative burst response of PMNs to TNF-alpha and FMLP) were performed at baseline, 2 weeks after supragingival, and 4 months after subgingival therapy. 4 months after completion of non-surgical therapy, the following compared to baseline significant (p < or = 0.05) changes (delta) of clinical parameters (median) were found in diabetic patients versus control patients: deltaAPI (30.4% versus 36.3%), deltaPBI (22.9% versus 24.2%), deltaBOP (39.5% versus 46.9%). The median % per patient of pockets with PPD > or = 4 mm decreased from 41.9% to 28.3% in diabetics, and from 41.6% to 31.8% in controls. Microbiologically, similar reductions of periopathogenic bacteria were found in diabetics and controls. Neither periodontal data nor the oxidative burst response of PMNs showed any significant difference (p > 0.05) between diabetics and control patients. In this study, periodontal therapy had no significant influence on medical data of diabetics. In conclusion, this study indicates that metabolically well-controlled diabetics might respond to non-surgical periodontal therapy as well as healthy control patients.
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Affiliation(s)
- M Christgau
- Department of Operative Dentistry and Periodontology, University of Regensburg, Germany.
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Plasswilm L, Frenzel S, Hoeper J. Continous in vivo measurement of local mitochondrial metabolism after radiation. Eur J Cancer 1997. [DOI: 10.1016/s0959-8049(97)84498-x] [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: 10/18/2022]
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Pokhodnia K, Cassoux P, Bonvoisin J, Mlayah A, Brossard L, Frenzel S, Müllen K. Experimental Evidence of the Symmetry Breakdown in 4,8-Diethoxy-2,7-bis(benzo-1‘,3‘-dithiol-2‘-ylidene)-1,3,5,7-tetrathia-s-indacene Compounds. J Phys Chem B 1997. [DOI: 10.1021/jp962246p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Pokhodnia
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - P. Cassoux
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - J. Bonvoisin
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - A. Mlayah
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - L. Brossard
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - S. Frenzel
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
| | - K. Müllen
- Institute of Semiconductors NASU, av. Nauki, 45, Kiev, Ukraine, LCC-CNRS, 205 Route de Narbonne, 31077 Toulouse Cedex, France, CEMES-CNRS, 29 Rue Jeanne-Marvig, 31055 Toulouse Cedex, France, Service National des Champs Magnétiques Pulsés du CNRS et Laboratoire de Physique des Solides, Complexe Scientifique de Rangueil, 31077 Toulouse Cedex, France, and Max Planck Institut für Polymerforschung, Postfach 3148, 55021 Mainz, Germany
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Fischer U, Detschew W, Jutzi E, Albrecht G, Abel P, Salzsieder E, Freyse EJ, Frenzel S, Lemke K. In vivo comparison of different algorithms for the artificial beta-cell. Artif Organs 1985; 9:173-9. [PMID: 4015454 DOI: 10.1111/j.1525-1594.1985.tb04370.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Using an extracorporeal artificial beta-cell in chronically diabetic dogs, the effects of four different mathematical models of glucose-controlled insulin dosage were compared: the Biostator algorithm (quadratic equation), Toronto algorithm (hyperbolic tangent function), Karlsburg algorithm (modified first-order derivative controller), and Ilmenau algorithm (second-order linear difference equation). The constants of all formulas implemented for the artificial beta-cell were obtained by regression analysis of paired blood glucose and plasma insulin data from normal control animals. Thus, they were biologically equivalent for all formulas. The patterns of blood glucose, insulin doses, and plasma insulin before, during, and after an intravenous glucose infusion test performed during the glucose-controlled insulin infusion showed no significant differences between the experimental groups subjected to the different algorithms. However, in no case were really normal blood glucose response curves restored by the artificial beta-cell. This might be due, first, to the fact that the algorithm parameters were not adapted to the actual individual insulin responsiveness, second, to the unphysiological peripheral venous route of insulin administration, and, third, to the lack of appropriate adaptation of the animals to normoglycemia.
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Rumpf KW, Frenzel S, Lowitz HD, Scheler F. [The effect of indomethacin on basal and stimulated plasma renin activity in normal subjects (author's transl)]. Klin Wochenschr 1976; 54:255-9. [PMID: 1263402 DOI: 10.1007/bf01468920] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The influence of indomethacin, a potent inhibitor of prostaglandin synthesis, on basal and stimulated plasma renin activities in normal human subjects was determined. Stimulation of the renin activity was achieved by orthostasis or by furosemide. Indomethacin led to a considerable decrease of both basal and stimulated plasma renin activity in chronic and acute experiments. Our experiments provide no evidence that major changes in the sodium balance are responsible for the effects observed. It is concluded that some antagonistic function of the renin angiotensin system and prostaglandins seems probable. These antagonistic actions might play a role in the regulation of the kidney circulation or the arterial blood pressure.
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Rumpf KW, Frenzel S, Lowitz HD, Scheler F. The effect of indomethacin on plasma renin activity in man under normal conditions and after stimulation of the renin angiotensin system. Prostaglandins 1975; 10:641-8. [PMID: 1105696 DOI: 10.1016/s0090-6980(75)80011-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
1) The influence of oral indomethacin on basal and stimulated plasma renin activity in normal human subjects was determined. 2) Indomethacin lowers the basal plasma renin activity in man. 3) The response of the plasma renin activity after indomethacin to physiological and pharmacological stimuli is maintained at a lower level. 4) There is no evidence from our experiments that major changes in the sodium balance are responsible for the effects observed.
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