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Jovtchev S, Stoeff S, Arnold K, Zschörnig O. Studies on the aggregation behaviour of pegylated human red blood cells with the Zeta sedimentation technique. Clin Hemorheol Microcirc 2008; 39:229-233. [PMID: 18503130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Covalent binding of poly(ethylene glycol), abbreviated as PEG, to red blood cells (RBC) surface leads to masking of the RBC blood group determinants and the PEG layer on the cell surface sterically hinders RBC-RBC and RBC-plasma protein interactions. We cross-linked linear mPEG-SPA of various molecular mass (2000, 5000, 20000) to washed human RBC under varying incubation ratios polymer to RBC. The electrophoretic mobility (EM) of the modified RBC decreases with increasing of chain length and concentration of PEG up to 50%. It may reflect the alteration in the surface layer thickness and friction. The aggregation behaviour of the pegylated RBC was studied with the Zeta sedimentation technique modifying the cell-cell interactions pressing them toward each other under centrifugal forces of various magnitudes. As a rule at low centrifugation forces the increase in chain length and concentration of PEG linked to RBC surface reduces the dextran-induced aggregation probably via elevation of the steric repulsion, which counteracts the depletion force generated by the free polymer. This effect was reversed to some extent by elevation of free dextran concentration and centrifugation forces. If cell-cell polymer bridging starts playing a role under these conditions requires further experimental and theoretical investigations.
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Vecherin SN, Ostashev VE, Ziemann A, Wilson DK, Arnold K, Barth M. Tomographic reconstruction of atmospheric turbulence with the use of time-dependent stochastic inversion. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2007; 122:1416. [PMID: 17927403 DOI: 10.1121/1.2756798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Acoustic travel-time tomography allows one to reconstruct temperature and wind velocity fields in the atmosphere. In a recently published paper [S. Vecherin et al., J. Acoust. Soc. Am. 119, 2579 (2006)], a time-dependent stochastic inversion (TDSI) was developed for the reconstruction of these fields from travel times of sound propagation between sources and receivers in a tomography array. TDSI accounts for the correlation of temperature and wind velocity fluctuations both in space and time and therefore yields more accurate reconstruction of these fields in comparison with algebraic techniques and regular stochastic inversion. To use TDSI, one needs to estimate spatial-temporal covariance functions of temperature and wind velocity fluctuations. In this paper, these spatial-temporal covariance functions are derived for locally frozen turbulence which is a more general concept than a widely used hypothesis of frozen turbulence. The developed theory is applied to reconstruction of temperature and wind velocity fields in the acoustic tomography experiment carried out by University of Leipzig, Germany. The reconstructed temperature and velocity fields are presented and errors in reconstruction of these fields are studied.
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Friederichs B, Arnold K, Wahl HG. HemoCue Albumin 201: Quantitative Bestimmung von Albumin im Urin in der patientennahen Sofortdiagnostik (POCT). DIABETOL STOFFWECHS 2007. [DOI: 10.1055/s-2007-982176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rutland A, Brown RJ, Cameron L, Ahmavaara A, Arnold K, Samson J. Development of the positive–negative asymmetry effect: in-group exclusion norm as a mediator of children's evaluations on negative attributes. EUROPEAN JOURNAL OF SOCIAL PSYCHOLOGY 2007. [DOI: 10.1002/ejsp.342] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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55
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Dréau K, Dazen D, Martin R, Arnold K, Conti S, Miller M. Measurement of ankle proprioception under self-driven servocontrol. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)83291-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Schiller J, Süss R, Arnhold J, Fuchs B, Lessig J, Müller M, Petković M, Spalteholz H, Zschörnig O, Arnold K. Matrix-assisted laser desorption and ionization time-of-flight (MALDI-TOF) mass spectrometry in lipid and phospholipid research. Prog Lipid Res 2004; 43:449-88. [PMID: 15458815 DOI: 10.1016/j.plipres.2004.08.001] [Citation(s) in RCA: 252] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The interest in the analysis of lipids and phospholipids is continuously increasing due to the importance of these molecules in biochemistry (e.g. in the context of biomembranes and lipid second messengers) as well as in industry. Unfortunately, commonly used methods of lipid analysis are often time-consuming and tedious because they include previous separation and/or derivatization steps. With the development of "soft-ionization techniques" like electrospray ionization (ESI) or matrix-assisted laser desorption and ionization time-of-flight (MALDI-TOF), mass spectrometry became also applicable to lipid analysis. The aim of this review is to summarize so far available experiences in MALDI-TOF mass spectrometric analysis of lipids. It will be shown that MALDI-TOF MS can be applied to all known lipid classes and the characteristics of individual lipids will be discussed. Additionally, some selected applications in medicine and biology, e.g. mixture analysis, cell and tissue analysis and the determination of enzyme activities will be described. Advantages and disadvantages of MALDI-TOF MS in comparison to other established lipid analysis methods will be also discussed.
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Arnold K. Press Release: Exposure to Famine Associated with Increased Breast Cancer Risk. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.7.495-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Arnold K. Press Release: Immediate Mammogram Reading May Decrease Stress Associated With Abnormal Results. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.7.495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Arnold K. Press Release: Treatment of Ductal Carcinoma In Situ Varies Widely in United States. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.6.419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Arnold K. In Brief. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.6.432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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61
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Arnold K. Press Release: Study Examines Physical, Emotional Well-Being Following Breast Cancer Treatment. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.5.341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Arnold K. Press Release: Study Examines Role of Helicobacter Pylori in Esophageal Cancer Development. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.5.341-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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63
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Arnold K. Press Release: HPV Testing Helps Identify Potential Cases of Cervical Cancer, Meta-Analysis Suggests. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.4.247-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Arnold K. Press Release: Revised Guidelines Published for Testing for Hereditary Type of Colorectal Cancer. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.4.247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Arnold K. In Brief. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.4.260-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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66
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Arnold K. In Brief. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.3.174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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67
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Arnold K. Press Release: Computer-Aided Detection System for Mammography Does Not Change Recall, Breast Cancer Detection Rates. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.3.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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68
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Arnold K. In Brief. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.2.98] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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69
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Arnold K. Press Release: Radiotherapy Improves Survival After Breast-Conserving Surgery for Early-Stage Breast Cancer. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.2.85-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Arnold K. Press Release: Exposure to Carcinogens Not Proportionally Decreased by Reduction in Smoking. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.2.85] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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71
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Arnold K. In Brief. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.1.12-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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72
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Arnold K. Press Release: BRCA Mutations Not Associated with Colorectal Cancer Risk, Studies Suggest. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.1.1-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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73
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Arnold K. Press Release: Active Smoking Associated With Increased Risk of Breast Cancer. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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74
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Arnold K. Press Release: Aspirin Use May Be Associated With Increased Risk of Pancreatic Cancer. J Natl Cancer Inst 2004. [DOI: 10.1093/jnci/96.1.1-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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75
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Petersen D, Przybyla I, Paulsen M, Albersmeyer K, Jacobsen R, Möller M, Petersen F, Arnold K, Vorwig KH. Validation of a Pneumatic Post between Two Hospitals for the Transport of Red Cell Concentrates and Blood Samples. Transfus Med Hemother 2003. [DOI: 10.1159/000075864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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