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Klotz S, Kurz T, Richardt D, Thiele H, Sievers H. Transcatheter Aortic Valve Implantation (TAVI) in Left Ventricular Assist Device (LVAD) Patients with Aortic Valve Insufficiency: A Word of Caution. Thorac Cardiovasc Surg 2017. [DOI: 10.1055/s-0037-1598949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ludl AA, Bove LE, Corradini D, Saitta AM, Salanne M, Bull CL, Klotz S. Probing ice VII crystallization from amorphous NaCl–D2O solutions at gigapascal pressures. Phys Chem Chem Phys 2017; 19:1875-1883. [DOI: 10.1039/c6cp07340a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The high density amorphous solution NaCl·10.2D2O crystallises at 260 K as almost pure ice VII during annealing at gigapascal pressures.
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Pretze M, Pallavi P, Roscher M, Klotz S, Caballero J, Binzen U, Greffrath W, Treede RD, Harmsen MC, Hafner M, Yard B, Wängler C, Wängler B. Radiofluorinated N-Octanoyl Dopamine ([ 18F]F-NOD) as a Tool To Study Tissue Distribution and Elimination of NOD in Vitro and in Vivo. J Med Chem 2016; 59:9855-9865. [PMID: 27731639 DOI: 10.1021/acs.jmedchem.6b01191] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
To mitigate pretransplantation injury in organs of potential donors, N-octanoyl dopamine (NOD) treatment might be considered as it does not affect hemodynamic parameters in braindead (BD) donors. To better assess optimal NOD concentrations for donor treatment, we report on the fast and facile radiofluorination of the NOD-derivative [18F]F-NOD [18F]5 for in vivo assessment of NOD's elimination kinetics by means of PET imaging. [18F]5 was synthesized in reproducibly high radiochemical yields and purity (>98%) as well as high specific activities (>20 GBq/μmol). Stability tests showed no decomposition of [18F]5 over a period of 120 min in rat plasma. In vitro, low cell association was found for [18F]5, indicating no active transport mechanism into cells. In vivo, [18F]5 exhibited a fast blood clearance and a predominant hepatobiliary elimination. As these data suggest that also NOD might be cleared fast, further pharmacokinetic evaluation is warranted.
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Klotz S, Komatsu K, Pietrucci F, Kagi H, Ludl AA, Machida S, Hattori T, Sano-Furukawa A, Bove LE. Ice VII from aqueous salt solutions: From a glass to a crystal with broken H-bonds. Sci Rep 2016; 6:32040. [PMID: 27562476 PMCID: PMC5000010 DOI: 10.1038/srep32040] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2016] [Accepted: 07/26/2016] [Indexed: 11/16/2022] Open
Abstract
It has been known for decades that certain aqueous salt solutions of LiCl and LiBr readily form glasses when cooled to below ≈160 K. This fact has recently been exploited to produce a « salty » high-pressure ice form: When the glass is compressed at low temperatures to pressures higher than 4 GPa and subsequently warmed, it crystallizes into ice VII with the ionic species trapped inside the ice lattice. Here we report the extreme limit of salt incorporation into ice VII, using high pressure neutron diffraction and molecular dynamics simulations. We show that high-pressure crystallisation of aqueous solutions of LiCl∙RH2O and LiBr∙RH2O with R = 5.6 leads to solids with strongly expanded volume, a destruction of the hydrogen-bond network with an isotropic distribution of water-dipole moments, as well as a crystal-to-amorphous transition on decompression. This highly unusual behaviour constitutes an interesting pathway from a glass to a crystal where translational periodicity is restored but the rotational degrees of freedom remaining completely random.
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Richardt D, Klotz S, Petersen M, Bucsky B, Hanke T, Stierle U, Sievers HH. Long Term Survival after Aortic Valve-sparing (David and Yacoub) Operation. Thorac Cardiovasc Surg 2016. [DOI: 10.1055/s-0036-1571612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Sendek A, Herz K, Auge H, Hensen I, Klotz S. Performance and responses to competition in two congeneric annual species: does seed heteromorphism matter? PLANT BIOLOGY (STUTTGART, GERMANY) 2015. [PMID: 26206119 DOI: 10.1111/plb.12372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Variations in seed characteristics observed in heteromorphic species may affect various stages of their life cycles, e.g. seed dormancy, germination characteristics or even adult plant performance. Highly specialised seed morphs - described as colonisers and maintainers - exhibit a trade-off between colonisation capacity and competitive traits. The performance of distinct seed morph progeny under competitive conditions, and especially in multi-species arrangements, had previously not been given much attention. In this study, we compared performance and response to competition among distinct seed morph progenies in two congeneric, co-occurring species: the invasive Bidens frondosa and the non-invasive Bidens tripartita. We hypothesised that maintainer seed morphs of both species would perform better under increased plant densities and within inter-morphic mixtures, while coloniser morphs would show stronger responses to increased densities and perform relatively poorly in inter-morphic mixtures. We conducted a growth trial and a greenhouse experiment, which revealed that seed morph progeny differed significantly in plant height when grown without competition, while under competitive conditions such differences became less apparent. The observed pattern was more strongly pronounced in B. frondosa, which showed a general predominance in stature and biomass over its non-invasive congener. Although seed morphs performed equally well under competitive conditions, increased plant height and more rapid germination can favour the maintainer seed morph on sites where vegetation is already present.
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Klotz S, Pallavi P, Tsagogiorgas C, Zimmer F, Zöllner FG, Binzen U, Greffrath W, Treede RD, Walter J, Harmsen MC, Krämer BK, Hafner M, Yard BA, Hoeger S. N-octanoyl dopamine treatment exerts renoprotective properties in acute kidney injury but not in renal allograft recipients. Nephrol Dial Transplant 2015; 31:564-73. [DOI: 10.1093/ndt/gfv363] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 09/17/2015] [Indexed: 12/26/2022] Open
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Donnelly M, Bull CL, Husband RJ, Frantzana AD, Klotz S, Loveday JS. Urea and deuterium mixtures at high pressures. J Chem Phys 2015; 142:124503. [PMID: 25833592 DOI: 10.1063/1.4915523] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Urea, like many network forming compounds, has long been known to form inclusion (guest-host) compounds. Unlike other network formers like water, urea is not known to form such inclusion compounds with simple molecules like hydrogen. Such compounds if they existed would be of interest both for the fundamental insight they provide into molecular bonding and as potential gas storage systems. Urea has been proposed as a potential hydrogen storage material [T. A. Strobel et al., Chem. Phys. Lett. 478, 97 (2009)]. Here, we report the results of high-pressure neutron diffraction studies of urea and D2 mixtures that indicate no inclusion compound forms up to 3.7 GPa.
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Ludl AA, Bove LE, Saitta AM, Salanne M, Hansen TC, Bull CL, Gaal R, Klotz S. Structural characterization of eutectic aqueous NaCl solutions under variable temperature and pressure conditions. Phys Chem Chem Phys 2015; 17:14054-63. [PMID: 25955540 DOI: 10.1039/c5cp00224a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The structure of amorphous NaCl solutions produced by fast quenching is studied as a function of pressure, up to 4 GPa, by combined neutron diffraction experiments and classical molecular dynamics simulations. Similarly to LiCl solutions the system amorphizes at ambient pressure in a dense phase structurally similar to the e-HDA phase in pure water. The measurement of the static structure factor as a function of pressure allowed us to validate a new polarizable force field developed by Tazi et al., 2012, never tested under non-ambient conditions. We infer from simulations that the hydration shells of Na(+) cations form well defined octahedra composed of both H2O molecules and Cl(-) anions at low pressure. These octahedra are gradually broken by the seventh neighbour moving into the shell of first neighbours yielding an irregular geometry. In contrast to LiCl solutions and pure water, the system does not show a polyamorphic transition under pressure. This confirms that the existence of polyamorphism relies on the tetrahedral structure of water molecules, which is broken here.
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Charitos E, Stierle U, Klotz S, Hanke T, Sievers HH. A Decision Tree for the Replacement of the Ascending Aorta in Patients Undergoing Aortic Valve Surgery: A Single Center Experience in 1362 Patients. Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Klotz S, Meyer-Saraei R, Frydrychowicz A, Scharfschwerdt M, Sievers H. A New Method to Replace the Left Ventricle with an Assist Device - 4-Dimensional Flow Visualization -. Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544269] [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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Klotz S, Tsvelodub S, Hanke T, Petersen M, Stiele U, Sievers H. Outcome of Mitral Valve Surgery in Patients with Chronic Mitral Regurgitation and Low Ejection Fraction: Repair or Replacement? Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544319] [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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Klotz S, Eggers S, Sievers H. Measurement of Quality of Life with LVAD Destination Therapy. Thorac Cardiovasc Surg 2015. [DOI: 10.1055/s-0035-1544433] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Klotz S, Hanke T, Petersen M, Sievers H. 292 * PERIPHERAL OR CENTRAL CANNULATION IN ACUTE TYPE A DISSECTION: DOES IT REALLY MATTER? Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.292] [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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Klotz S, Charitos E, Stierle U, Sievers H. Hospital Readmission with LVAD Destination Therapy. J Heart Lung Transplant 2014. [DOI: 10.1016/j.healun.2014.01.541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Gottardi W, Klotz S, Nagl M. Superior bactericidal activity of N-bromine compounds compared to their N-chlorine analogues can be reversed under protein load. J Appl Microbiol 2014; 116:1427-37. [PMID: 24905215 DOI: 10.1111/jam.12474] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/08/2014] [Accepted: 02/11/2014] [Indexed: 12/01/2022]
Abstract
AIMS To investigate and compare the bactericidal activity (BA) of active bromine and chlorine compounds in the absence and presence of protein load. METHODS AND RESULTS Quantitative killing tests against Escherichia coli and Staphylococcus aureus were performed both in the absence and in the presence of peptone with pairs of isosteric active chlorine and bromine compounds: hypochlorous and hypobromous acid (HOCl and HOBr), dichloro- and dibromoisocyanuric acid, chlorantine and bromantine (1,3-dibromo- and 1,3 dichloro-5,5-dimethylhydantoine), chloramine T and bromamine T (N-chloro- and N-bromo-4-methylbenzenesulphonamide sodium), and N-chloro- and N-bromotaurine sodium. To classify the bactericidal activities on a quantitative basis, an empirical coefficient named specific bactericidal activity (SBA), founded on the parameters of killing curves, was defined: SBA= mean log reductions/(mean exposure times x concentration) [mmol 1(-1) min (-1)]. In the absence of peptone, tests with washed micro-organisms revealed a throughout higher BA of bromine compounds with only slight differences between single substances. This was in contrast to chlorine compounds, whose killing times differed by a factor of more than four decimal powers. As a consequence, also the isosteric pairs showed according differences. In the presence of peptone, however, bromine compounds showed an increased loss of BA, which partly caused a reversal of efficacy within isosteric pairs. CONCLUSIONS In medical practice, weakly oxidizing active chlorine compounds like chloramines have the highest potential as topical anti-infectives in the presence of proteinaceous material (mucous membranes, open wounds). Active bromine compounds, on the other hand, have their chance at insensitive body regions with low organic matter, for example skin surfaces. SIGNIFICANCE AND IMPACT OF THE STUDY The expected protein load is one of the most important parameters for selection of a suited active halogen compound.
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Zöllner FG, Zimmer F, Klotz S, Hoeger S, Schad LR. Functional imaging of acute kidney injury at 3 Tesla: investigating multiple parameters using DCE-MRI and a two-compartment filtration model. Z Med Phys 2014; 25:58-65. [PMID: 24629306 DOI: 10.1016/j.zemedi.2014.01.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 01/10/2014] [Accepted: 01/10/2014] [Indexed: 11/28/2022]
Abstract
OBJECT To investigate how MR-based parameters reflect functional changes in kidneys with acute kidney injury (AKI) using dynamic contrast enhanced MRI and a two-compartment renal filtration model. MATERIALS AND METHODS MRI data of eight male Lewis rats were analyzed retrospectively. Five animals were subjected to AKI, three native rats served as control. All animals underwent perfusion imaging by dynamic contrast-enhanced MRI. Renal blood volume, glomerular filtration rate (GFR) as well as plasma and tubular mean transit times were estimated from regions-of-interest drawn in the renal cortex. Differences between healthy kidneys and kidneys subjected to AKI were analyzed using a paired t-test. RESULTS Significant differences between ischemic and healthy kidneys could only be detected for the glomerular filtration rate. For all other calculated parameters, differences were present, however not significant. In rats with AKI, average single kidney GFR was 0.66 ± 0.37 ml/min for contralateral and 0.26 ± 0.12 ml/ min for diseased kidneys (P = 0.0254). For the healthy control group, the average GFR was 0.39 ± 0.06 ml/min and 0.41 ± 0.11 ml/min, respectively. Differences between diseased kidneys of AKI rats and ipsilateral kidneys of the healthy control group were significant (P = 0.0381). CONCLUSION Significant differences of functional parameters reflecting damage of the renal tissue of kidneys with AKI compared to the contralateral, healthy kidneys could only be detected by GFR. GFR might be a useful parameter that allows for a spatially resolved detection of abnormal changes of renal tissue by AKI.
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Charitos E, Ziegler P, Stierle U, Graf B, Klotz S, Sievers HH, Hanke T. Atrial fibrillation burden estimates derived from intermittent rhythm monitoring should not be used for patient follow-up or as endpoints in clinical trials. Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Charitos E, Stierle U, Karluß A, Misfeld M, Hanke T, Klotz S, Sievers HH. Aortic leaflet interventions for aortic valve repair: How much is too much? Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Welp HA, Gottschalk A, Ellger B, Scherer M, Martens S, Eckardt L, Klotz S, Mönnig G. Driving with a drive-line: an evidence based approach of driving restriction after implantation of left ventricular assist device in end stage heart failure. Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Sievers HH, Stierle U, Hanke T, Klotz S, Schmidtke C, Charitos E. Phenotype of bicuspid aortic valve and management of the ascending aorta in 1362 patients. Thorac Cardiovasc Surg 2014. [DOI: 10.1055/s-0034-1367233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Bove LE, Klotz S, Strässle T, Koza M, Teixeira J, Saitta AM. Translational and rotational diffusion in water in the Gigapascal range. PHYSICAL REVIEW LETTERS 2013; 111:185901. [PMID: 24237539 DOI: 10.1103/physrevlett.111.185901] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Indexed: 06/02/2023]
Abstract
First measurements of the self-dynamics of liquid water in the GPa range are reported. The GPa range has here become accessible through a new setup for the Paris-Edinburgh press specially conceived for quasielastic neutron scattering studies. A direct measurement of both the translational and rotational diffusion coefficients of water along the 400 K isotherm up to 3 GPa, corresponding to the melting point of ice VII, is provided and compared with molecular dynamics simulations. The translational diffusion is observed to strongly decrease with pressure, though its variation slows down for pressures higher than 1 GPa and decouples from that of the shear viscosity. The rotational diffusion turns out to be insensitive to pressure. Through comparison with structural data and molecular dynamics simulations, we show that this is a consequence of the rigidity of the first neighbors shell and of the invariance of the number of hydrogen bonds of a water molecule under high pressure. These results show the inadequacy of the Stokes-Einstein-Debye equations to predict the self-diffusive behavior of water at high temperature and high pressure, and challenge the usual description of hot dense water behaving as a simple liquid.
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Charitos E, Stierle U, Hanke T, Klotz S, Sievers H. 222 * THE FATE OF BICUSPID VALVE AORTOPATHY AFTER AORTIC VALVE REPLACEMENT. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.222] [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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Pawlus S, Klotz S, Paluch M. Effect of compression on the relationship between viscosity and dielectric relaxation time in hydrogen-bonded primary alcohols. PHYSICAL REVIEW LETTERS 2013; 110:173004. [PMID: 23679720 DOI: 10.1103/physrevlett.110.173004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Indexed: 06/02/2023]
Abstract
High pressure viscosity and dielectric measurements were carried out on two monohydroxy alcohols, 2-ethyl-1-hexanol and 5-methyl-2-hexanol, at room temperature. Analysis of the dielectric relaxation times versus viscosity revealed the breakdown of the Einstein-Debye relation above some characteristic pressure. The failure of the Einstein-Debye relation is a manifestation of pressure induced changes of supramolecular hydrogen bonded structures which occur in these liquids.
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Klotz S, Putman L, Sievers HH. Easy and fast sternal closure system for severe adipositas. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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