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Search Results: 1 - 10 of 44 matches for " Goecke "
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Helmuth Goecke Sariego
Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas , 2002,
Abstract:
"Hierba del Clavo" (Geum chiloense) interfiere niveles de ciclosporina: Potencial riesgo para trasplantados
Duclos H,Jaime; Goecke S,Helmuth;
Revista médica de Chile , 2001, DOI: 10.4067/S0034-98872001000700013
Abstract: we report a 54 years old male that received a renal allograft without complications. one year after the transplantation, she was receiving cyclosporine doses of 2 to 3 mg/kg and maintained serum levels of 60 to 90 mg/dl. an abrupt increase in cyclosporine serum levels to 469 and 600 mg/dl was noted after 15 months of transplantation. after a careful interrogation the patient admitted the use of geum chiloense ("hierba del clavo"). discontinuing this herbal remedy, cyclosporine levels decreased to 55 mg/dl, despite the maintenance of the same cyclosporine dose. the potential side effects of herbal remedies must be borne in mind (rev méd chile 2001; 129: 789-90).
Fibrosis retroperitoneal asociada a uso crónico de ergotamina. Tratamiento con colchicina y esteroides: Caso clínico
Vega,Jorge; Goecke,Helmuth; Santamarina,Mario;
Revista médica de Chile , 2011, DOI: 10.4067/S0034-98872011000400012
Abstract: retroperitoneal fibrosis (rpf) associated with chronic use of ergotamine is a very rare disorder. we report a 45-year-old woman who presented with a rpf after using, almost daily for 23 years, ergotamine tartrate for migraine relief. frp presented as a chronicinflammatory state, anemia, abdominal and lumbosacral pain and a hypogastric mass. a ct-scan showed a periaortic mass and left hydronephrosis. a percutaneous biopsy was obtained and the patient was subjected to a surgical ureterolysis and tissue resection. the biopsy confirmed the presence of rpf. due to persistent symptoms and increase in the volume of periaortic tissue, treatment with colchicine 1 mg/day and defazacort 30 mg/day was started, resulting in a rapid di-sappearance of symptoms, disappearance ofinflammation and a significant reduction in the volume of the periaortic tissue. the patient remains in complete remission after 29 months of follow up.
Finite volume effects and dynamical chiral symmetry breaking in QED3
Goecke, Tobias;Fischer, Christian S.;Williams, Richard
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevB.79.064513
Abstract: We investigate the impact of finite volume effects on the critical number of flavours, N_f^c, for chiral symmetry restoration in QED3. To this end we solve a set of coupled Dyson-Schwinger equations on a torus. For order parameters such as the anomalous dimension of the fermion wave function or the chiral condensate we find substantial evidence for a large dependence on the volume. We observe a shift in N_f^c from values in the range of 3.61 \le N_f^c \le 3.84 in the infinite volume/continuum limit down to values below N_f \le 1.5 at finite volumes in agreement with earlier results of Gusynin and Reenders in a simpler truncation scheme. These findings explain discrepancies in N_f^c between continuum and lattice studies.
The role of vector meson dominance and running masses in the hadronic contributions to the muon $g-2$
Goecke, Tobias;Fischer, Christian S.;Williams, Richard
High Energy Physics - Phenomenology , 2013,
Abstract: We summarize our recent results for the quark loop part of the light-by-light scattering contribution as well as the hadronic vacuum polarisation contributions to the anomalous magnetic moment of the muon. In particular we focus on the role played by the momentum dependence of the quark- and quark-photon vertex dressing functions. We give a detailed comparison of the Dyson-Schwinger description of this contribution to the corresponding picture emerging from hadronic models in particular the extended Nambu--Jona-Lasonio model (ENJL). We find that the details of the momentum dependence are important on a quantitative level. Especially the transverse parts of the quark-photon-vertex, which serve as a dynamical extension of simple vector meson dominance models, do not yield the large suppression of the light-by-light contribution found in the ENJL model if realistic dressings are taken into account.
Non-contact interactions and the hadronic light-by-light contribution to the muon g-2
Williams, Richard;Fischer, Christian S.;Goecke, Tobias
High Energy Physics - Phenomenology , 2013,
Abstract: We summarise recent results for the quark loop part of the light-by-light scattering contribution to the muons anomalous magnetic moment. In particular we focus on the impact of a momentum dependent quark and quark-photon vertex. We compare the Dyson-Schwinger description with that of the extended Nambu--Jona-Lasinio model (ENJL) and find important quantitative differences. In particular the transverse parts of the quark-photon-vertex, which serve as a dynamical extension of simple vector meson dominance models, do not yield the large suppression as found in the ENJL model.
"Hierba del Clavo" (Geum chiloense) interfiere niveles de ciclosporina: Potencial riesgo para trasplantados Geum chiloense (Hierba del clavo) modifying cyclosporine levels.: Report of one case
Jaime Duclos H,Helmuth Goecke S
Revista médica de Chile , 2001,
Abstract: We report a 54 years old male that received a renal allograft without complications. One year after the transplantation, she was receiving cyclosporine doses of 2 to 3 mg/kg and maintained serum levels of 60 to 90 mg/dl. An abrupt increase in cyclosporine serum levels to 469 and 600 mg/dl was noted after 15 months of transplantation. After a careful interrogation the patient admitted the use of Geum chiloense ("hierba del clavo"). Discontinuing this herbal remedy, cyclosporine levels decreased to 55 mg/dl, despite the maintenance of the same cyclosporine dose. The potential side effects of herbal remedies must be borne in mind (Rev Méd Chile 2001; 129: 789-90).
Fibrosis retroperitoneal asociada a uso crónico de ergotamina. Tratamiento con colchicina y esteroides: Caso clínico Retroperitoneal fibrosis associated with chronic use of ergotamine: Report of one case
Jorge Vega,Helmuth Goecke,Mario Santamarina
Revista médica de Chile , 2011,
Abstract: Retroperitoneal fibrosis (RPF) associated with chronic use of ergotamine is a very rare disorder. We report a 45-year-old woman who presented with a RPf after using, almost daily for 23 years, ergotamine tartrate for migraine relief. FRP presented as a chronicinflammatory state, anemia, abdominal and lumbosacral pain and a hypogastric mass. A CT-Scan showed a periaortic mass and left hydronephrosis. A percutaneous biopsy was obtained and the patient was subjected to a surgical ureterolysis and tissue resection. The biopsy confirmed the presence of RPf. Due to persistent symptoms and increase in the volume of periaortic tissue, treatment with colchicine 1 mg/day and defazacort 30 mg/day was started, resulting in a rapid di-sappearance of symptoms, disappearance ofinflammation and a significant reduction in the volume of the periaortic tissue. The patient remains in complete remission after 29 months of follow up.
Finite volume effects and dynamical chiral symmetry breaking in QED3
Tobias Goecke,Christian S. Fischer,Richard Williams
Physics , 2008, DOI: 10.1103/PhysRevB.79.064513
Abstract: We investigate the impact of finite volume effects on the critical number of flavours, N_f^c, for chiral symmetry restoration in QED3. To this end we solve a set of coupled Dyson-Schwinger equations on a torus. For order parameters such as the anomalous dimension of the fermion wave function or the chiral condensate we find substantial evidence for a large dependence on the volume. We observe a shift in N_f^c from values in the range of 3.61 \le N_f^c \le 3.84 in the infinite volume/continuum limit down to values below N_f \le 1.5 at finite volumes in agreement with earlier results of Gusynin and Reenders in a simpler truncation scheme. These findings explain discrepancies in N_f^c between continuum and lattice studies.
Leading-order calculation of hadronic contributions to the muon $g-2$ using the Dyson-Schwinger approach
Tobias Goecke,Christian S. Fischer,Richard Williams
Physics , 2011, DOI: 10.1016/j.physletb.2011.09.019
Abstract: We present a calculation of the hadronic vacuum polarization (HVP) tensor within the framework of Dyson--Schwinger equations. To this end we use a well-established phenomenological model for the quark-gluon interaction with parameters fixed to reproduce hadronic observables. From the HVP tensor we compute both the Adler function and the HVP contribution to the anomalous magnetic moment of the muon, $a_\mu$. We find $a_\mu^{HVP}= 6760\times 10^{-11}$ which deviates about two percent from the value extracted from experiment. Additionally, we make comparison with a recent lattice determination of $a_\mu^{HVP}$ and find good agreement within our approach. We also discuss the implications of our result for a corresponding calculation of the hadronic light-by-light scattering contribution to $a_\mu$.
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