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Hanke JS, Avsar M, Rojas SV, Fleischer B, Wiegmann B, Ehrenberg K, Bertram H, Strüber M, Haverich A, Schmitto J. Minimally-invasive LVAD-implantation as bridging to transplant strategy in treatment of cardiac failure in middle-aged children. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332362] [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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Martens A, Engelke H, Rojas SV, Reitz M, Stiefel P, Haverich A, Shrestha M, Kutschka I. Total arterial revascularisation with left internal thoracic artery and radial artery T-Grafts results in excellent long term survival and quality of life. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332247] [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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Rojas SV, Avsar M, Hanke JS, Fischer L, Wiegmann B, Fleischer B, Meyer A, Repges L, Thoms T, Strüber M, Kutschka I, Haverich A, Schmitto J. Minimally-invasive approach for left ventricular assist device implantation: Lower mortality and improved early outcome in adult patients with severe heart failure. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332291] [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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Hanke JS, Avsar M, Rojas SV, Li Y, Malehsa D, Kutschka I, Haverich A, Schmitto J. Minimally-invasive LVAD-implantation improves outcome in reoperative cases. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332260] [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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Baraki H, Kensah G, Asch S, Rojas SV, Martens A, Haverich A, Gruh I, Kutschka I. Epicardial or intramyocardial bioartificial tissue transplantation: Does the surgical implantation technique influence cell survival? Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332300] [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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Fleischer B, Avsar M, Malehsa D, Kühn C, Rojas SV, Wiegmann B, Hanke JS, Haverich A, Schmitto J. Improved survival of INTERMACS 1 patients with ECMO-support before assist device implantation. Thorac Cardiovasc Surg 2013. [DOI: 10.1055/s-0032-1332305] [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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Martens A, Rojas SV, Baraki H, Reitz M, Khaladj N, Hagl C, Haverich A, Shrestha M, Kutschka I. Total arterial revascularization with composite T-grafts: Is outcome related to surgical experience? Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Baraki H, Kensah G, Gruh I, Rojas S, Martens A, Haverich A, Kutschka I. Intramyocardial transplantation of bioartificial cardiac tissue splints for restauration of infarcted myocardium in rats. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Martens A, Kensah G, Rojas S, Rotärmel A, Baraki H, Haverich A, Martin U, Gruh I, Kutschka I. Induced pluripotent stem cell (iPSC)-derived cardiomyocytes engraft and improve heart function in a mouse model of acute myocardial infarction. Thorac Cardiovasc Surg 2012. [DOI: 10.1055/s-0031-1297673] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Pino F, Roé N, Orero A, Falcón C, Rojas S, Benlloch JM, Ros D, Pavía J. Development of a variable-radius pinhole SPECT system with a portable gamma camera. ACTA ACUST UNITED AC 2011; 30:286-91. [PMID: 21640439 DOI: 10.1016/j.remn.2011.03.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Accepted: 03/02/2011] [Indexed: 11/25/2022]
Abstract
OBJECTIVE To develop a small-animal SPECT system using a low cost commercial portable gamma camera equipped with a pinhole collimator, a continuous scintillation crystal and a position-sensitive photomultiplier tube. MATERIAL AND METHODS The gamma camera was attached to a variable radius system, which enabled us to optimize sensitivity and resolution by adjusting the radius of rotation to the size of the object. To investigate the capability of the SPECT system for small animal imaging, the dependence of resolution and calibration parameters on radius was assessed and acquisitions of small phantoms and mice were carried out. RESULTS Resolution values, ranging from 1.0mm for a radius of 21.4mm and 1.4mm for a radius of 37.2mm were obtained, thereby justifying the interest of a variable radius SPECT system. CONCLUSIONS The image quality of phantoms and animals were satisfactory, thus confirming the usefulness of the system for small animal SPECT imaging.
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Martens A, Rojas SV, Rathert C, Gruh I, Mauritz C, Meier M, Martin U, Haverich A, Kutschka I. Magnetic resonance imaging and PV loop analysis for cardiac evaluation in small mice. A comparative analysis. Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1268965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Martens A, Rojas SV, Reitz M, Khaladj N, Hagl C, Shrestha M, Haverich A, Kutschka I. Is composite T-grafting in total arterial revascularisation safe when four or more coronary vessels are grafted? Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1269353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Rojas SV, Martens A, Meier M, Baraki H, Schecker N, Rathert C, Schwanke K, Martin U, Haverich A, Kutschka I. Multimodal imaging for in vivo assessment of vitality and localization of transplanted induced pluripotent stem cells in a mouse model of myocardial infarction. Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1269113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Martens A, Rojas SV, Reitz M, Khaladj N, Hagl C, Shrestha M, Haverich A, Kutschka I. How technically demanding is composite T-grafting in total arterial revascularisation? Thorac Cardiovasc Surg 2011. [DOI: 10.1055/s-0030-1269104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hoekzema E, Herance R, Rojas S, Pareto D, Abad S, Jiménez X, Figueiras FP, Popota F, Ruiz A, Torrent È, Fernández-Soriano FJ, Rocha M, Rovira M, Víctor VM, Gispert JD. The effects of aging on dopaminergic neurotransmission: a microPET study of [11C]-raclopride binding in the aged rodent brain. Neuroscience 2010; 171:1283-6. [PMID: 20937365 DOI: 10.1016/j.neuroscience.2010.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 09/29/2010] [Accepted: 10/03/2010] [Indexed: 10/19/2022]
Abstract
Rodent models are frequently used in aging research to investigate biochemical age effects and aid in the development of therapies for pathological and non-pathological age-related degenerative processes. In order to validate the use of animal models in aging research and pave the way for longitudinal intervention-based animal studies, the consistency of cerebral aging processes across species needs to be evaluated. The dopaminergic system seems particularly susceptible to the aging process, and one of the most consistent findings in human brain aging research is a decline in striatal D2-like receptor (D2R) availability, quantifiable by positron emission tomography (PET) imaging. In this study, we aimed to assess whether similar age effects can be discerned in rat brains, using in vivo molecular imaging with the radioactive compound [(11)C]-raclopride. We observed a robust decline in striatal [(11)C]-raclopride uptake in the aged rats in comparison to the young control group, comprising a 41% decrement in striatal binding potential. In accordance with human studies, these results indicate that substantial reductions in D2R availability can be measured in the aged striatal complex. Our findings suggest that rat and human brains exhibit similar biochemical alterations with age in the striatal dopaminergic system, providing support for the pertinence of rodent models in aging research.
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Martens A, Gruh I, Dimitroulis D, Rojas S, Schmidt-Richter I, Rathert C, Khaladj N, Martin U, Haverich A, Kutschka I. Rhesus monkey derived „cardiospheres“ (CSps) for cardiac regenerative therapy in a mouse infarct model. Thorac Cardiovasc Surg 2010. [DOI: 10.1055/s-0029-1246792] [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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te Wildt B, Rojas S, Sachs S, Wedegärtner F, Szycik G. P02-158 - Emotional responses in excessive players of violent video games - an fMRI-study. Eur Psychiatry 2010. [DOI: 10.1016/s0924-9338(10)70772-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Rangel PL, Rodríguez A, Rojas S, Sharp PJ, Gutierrez CG. Testosterone stimulates progesterone production and STAR, P450 cholesterol side-chain cleavage and LH receptor mRNAs expression in hen (Gallus domesticus) granulosa cells. Reproduction 2009; 138:961-9. [PMID: 19710202 DOI: 10.1530/rep-09-0071] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The chicken ovary is organized into a hierarchy of yellow yolky follicles that ovulate on successive days. Active or passive immunization of laying hens against testosterone blocks ovulation without affecting follicle development. Testosterone may play a role in pre-ovulatory follicle maturation by stimulating granulosa progesterone production. We assessed whether this stimulus is dose-related and depends on the maturity of the donor follicle, and if it does so by stimulating granulosa cell STAR, P450 cholesterol side-chain cleavage (P450scc), and LH receptor (LHCGR) mRNAs expression. Progesterone production by granulosa cells from F1, F3, and F4 follicles, cultured for 3 h without testosterone was greater in cells collected 11-14 h than 1-4 h after ovulation. These differences in progesterone production were less pronounced after granulosa cells had been cultured for 24 h. Culture of granulosa cells for 3 or 24 h with testosterone (1-100 ng/ml) stimulated progesterone production in cells collected from F4, F3, or F1 follicles 1-4, or 11-14 h after ovulation. Testosterone (0-4000 ng/ml) alone or in combination with LH (0-100 ng/ml) increased progesterone production by F1 granulosa cells, collected 1-4 and 11-14 h after ovulation and cultured for 3 h. Finally, testosterone (10 or 100 ng/ml) increased STAR, P450scc, and LHCGR mRNAs, when added to 3 h cultures of F1 granulosa cells. In conclusion, testosterone stimulates granulosa cell progesterone production in hen pre-ovulatory hierarchical follicles irrespective of maturational state, acting alone or additively with LH. We propose that testosterone promotes granulosa cell maturation to facilitate the pre-ovulatory release of LH.
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de la Fuente J, Pérez-Alonso F, Martínez-Huerta M, Peña M, Fierro J, Rojas S. Identification of Ru phases in PtRu based electrocatalysts and relevance in the methanol electrooxidation reaction. Catal Today 2009. [DOI: 10.1016/j.cattod.2008.10.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Maquivar M, Verduzco A, Galina CS, Pulido A, Rojas S, Forster K, Van der Laan G, Arnoni R. Relationship Among Follicular Growth, Oestrus, Time of Ovulation, Endogenous Estradiol 17β and Luteinizing Hormone in Bos Indicus Cows After a Synchronization Program. Reprod Domest Anim 2007; 42:571-6. [DOI: 10.1111/j.1439-0531.2006.00821.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Espinoza-Navarro O, Vilaxa A, Granifo L, Rojas S, Rodríguez H. Histological Study on the Male Reproductive Organs of Mouse CF1 Treated With Boron. INT J MORPHOL 2007. [DOI: 10.4067/s0717-95022007000200017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kogan M, Rojas S, Gómez P, Suárez F, Muñoz JF, Alister C. Evaluation of six pesticides leaching indexes using field data of herbicide application in Casablanca Valley, Chile. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2007; 56:169-78. [PMID: 17849992 DOI: 10.2166/wst.2007.486] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
A field study was performed to evaluate the accuracy of six pesticide screening leaching indexes for herbicide movement. Adsorption, dissipation and soil movement were studied in a vineyard in a sandy loam soil during 2005 season. Simazine, diuron, pendimethalin, oxyfluorfen and flumioxazin were applied to bare soil at rates commonly used, and their soil concentrations throughout soil profile were determined at 0, 10, 20, 40 and 90 days after application (DAA). Herbicides were subjected to two pluviometric regimens, natural field condition and modified conditions (plus natural rainfall 180 mm). Leaching indexes utilized were: Briggs's Rf, Hamaker's Rf, LEACH, LPI, GUS and LIX. Simazine reached 120 cm, diuron 90 cm, flumioxazin 30 cm soil depth respectively. Pendimethalin and oxyfluorfen were retained up to 5 cm. None of the herbicides leaching was affected by rainfall regimen. Only flumioxazin field dissipation was clearly affected by pluviometric condition. The best representation of the herbicide soil depth movement and leaching below 15 cm soil depth were: Hamaker's Rf < Briggs's Rf < GUS < LPI, < LEACH < LIX. Field results showed a good correlation between herbicides K(d) and their soil depth movement and mass leached below 15 cm soil depth.
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Pérez-Alonso FJ, Granados ML, Ojeda M, Herranz T, Rojas S, Terreros P, Fierro JLG, Gracia M, Gancedo JR. Relevance in the Fischer−Tropsch Synthesis of the Formation of Fe−O−Ce Interactions on Iron−Cerium Mixed Oxide Systems. J Phys Chem B 2006; 110:23870-80. [PMID: 17125353 DOI: 10.1021/jp064575f] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of Fe-Ce mixed oxides (95 atom % Fe-5 atom % Ce) has been prepared by different methods: coprecipitation, impregnation, and physical mixture of Ce and Fe oxides. These solids have been tested in the Fischer-Tropsch synthesis. The characterization of the catalytic precursors was carried out by X-ray diffraction (XRD), Raman, Mössbauer, and X-ray photoelectron (XPS) spectroscopic techniques. When the preparation method ensures a microscopic contact between Fe and Ce cations in the solid, several types of Fe-Ce interactions are present in the calcined solids. The interactions take the shape of Fe-O-Ce bridges that can exist either in the hematite-like solid solution or in the interphase between the Fe oxide covered by microcrystals of Ce oxide. In the case of the hematite-like solid solution, Ce(IV) cations are dissolved in the alpha-Fe2O3 network. The promotion by Ce of the catalytic properties observed in the final catalysts can be directly related with the detection of these Fe-O-Ce bridges in the calcined solids. The Ce promotion results in a larger yield to hydrocarbons, a higher production of olefins, and a higher selectivity to medium and large chain hydrocarbons (larger than six carbon atoms). It is proposed that the Ce promotion is due to the presence of Fe0-Ce(III) ensembles in the final catalysts arising from the initial Fe-O-Ce bridges developed in the parent calcined samples.
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de la Fuente JG, Martínez-Huerta M, Rojas S, Terreros P, Fierro J, Peña M. Methanol electrooxidation on PtRu nanoparticles supported on functionalised carbon black. Catal Today 2006. [DOI: 10.1016/j.cattod.2006.05.083] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rodas C, Guzman M, Rojas S. Prevalence of Sensitization and Latex Allergy in Operating Room Workers of the Worker's Hospital, Santiago, Chile. J Allergy Clin Immunol 2006. [DOI: 10.1016/j.jaci.2005.12.315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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