Search Results - (Author, Cooperation:F. Ramirez)
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1Latest Papers from Table of Contents or Articles in PressS. de Azevedo, M. F. Gonzalez, C. Cintas, V. Ramallo, M. Quinto–Sanchez, F. Marquez, T. Hunemeier, C. Paschetta, A. Ruderman, P. Navarro, B. A. Pazos, C. C. Silva de Cerqueira, O. Velan, F. Ramirez–Rozzi, N. Calvo, H. G. Castro, R. R. Paz, R. Gonzalez–Jose
National Academy of Sciences
Published 2018Staff ViewPublication Date: 2018-05-23Publisher: National Academy of SciencesPrint ISSN: 0027-8424Electronic ISSN: 1091-6490Topics: BiologyMedicineNatural Sciences in GeneralKeywords: LettersPublished by: -
2Latest Papers from Table of Contents or Articles in PressJ. I. Aranda, D. Espinosa-Gómez, J. Montaño, B. Quezadas-Vivian, F. Ramírez-Zavaleta, and E. S. Tututi
American Physical Society (APS)
Published 2018Staff ViewPublication Date: 2018-12-13Publisher: American Physical Society (APS)Print ISSN: 0556-2821Electronic ISSN: 1089-4918Topics: PhysicsKeywords: Phenomenological aspects of field theory, general methodsPublished by: -
3Latest Papers from Table of Contents or Articles in PressR. J. Brienen ; O. L. Phillips ; T. R. Feldpausch ; E. Gloor ; T. R. Baker ; J. Lloyd ; G. Lopez-Gonzalez ; A. Monteagudo-Mendoza ; Y. Malhi ; S. L. Lewis ; R. Vasquez Martinez ; M. Alexiades ; E. Alvarez Davila ; P. Alvarez-Loayza ; A. Andrade ; L. E. Aragao ; A. Araujo-Murakami ; E. J. Arets ; L. Arroyo ; C. G. Aymard ; O. S. Banki ; C. Baraloto ; J. Barroso ; D. Bonal ; R. G. Boot ; J. L. Camargo ; C. V. Castilho ; V. Chama ; K. J. Chao ; J. Chave ; J. A. Comiskey ; F. Cornejo Valverde ; L. da Costa ; E. A. de Oliveira ; A. Di Fiore ; T. L. Erwin ; S. Fauset ; M. Forsthofer ; D. R. Galbraith ; E. S. Grahame ; N. Groot ; B. Herault ; N. Higuchi ; E. N. Honorio Coronado ; H. Keeling ; T. J. Killeen ; W. F. Laurance ; S. Laurance ; J. Licona ; W. E. Magnussen ; B. S. Marimon ; B. H. Marimon-Junior ; C. Mendoza ; D. A. Neill ; E. M. Nogueira ; P. Nunez ; N. C. Pallqui Camacho ; A. Parada ; G. Pardo-Molina ; J. Peacock ; M. Pena-Claros ; G. C. Pickavance ; N. C. Pitman ; L. Poorter ; A. Prieto ; C. A. Quesada ; F. Ramirez ; H. Ramirez-Angulo ; Z. Restrepo ; A. Roopsind ; A. Rudas ; R. P. Salomao ; M. Schwarz ; N. Silva ; J. E. Silva-Espejo ; M. Silveira ; J. Stropp ; J. Talbot ; H. ter Steege ; J. Teran-Aguilar ; J. Terborgh ; R. Thomas-Caesar ; M. Toledo ; M. Torello-Raventos ; R. K. Umetsu ; G. M. van der Heijden ; P. van der Hout ; I. C. Guimaraes Vieira ; S. A. Vieira ; E. Vilanova ; V. A. Vos ; R. J. Zagt
Nature Publishing Group (NPG)
Published 2015Staff ViewPublication Date: 2015-03-20Publisher: Nature Publishing Group (NPG)Print ISSN: 0028-0836Electronic ISSN: 1476-4687Topics: BiologyChemistry and PharmacologyMedicineNatural Sciences in GeneralPhysicsKeywords: Atmosphere/chemistry ; Biomass ; Brazil ; Carbon/analysis/metabolism ; Carbon Dioxide/*analysis/metabolism ; *Carbon Sequestration ; Plant Stems/metabolism ; *Rainforest ; Trees/growth & development/metabolism ; Tropical Climate ; Wood/analysisPublished by: -
4Articles: DFG German National LicensesStaff View
ISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The vibrational spectra of the chalcopyrite compounds CuInSe2 and CuGaSe2 have been studied by Raman microspectrometry. This technique is very useful in the present case where large single crystals are not generally available. The results have been used to resolve discrepancies in the reported data on the vibrational spectrum of CuInSe2.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesHernandez, V. ; Ramirez, F. J. ; Otero, T. F. ; Lopez Navarrete, J. T.
College Park, Md. : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: It is shown that the relevant spectral features which arise in the infrared spectrum of poly(3-methylthiophene) upon chemical doping or photoexcitation (i.e., in the electrically conducting form) can be properly explained by means of the effective conjugation coordinate (ECC) formalism. This theoretical dynamical model accounts for the intramolecular hopping of π electrons in the class of polyconjugated aromatic systems. A complete assignment for the infrared and Raman spectra of the polymer in the pristine state (i.e., in the insulating form) is proposed as the result of a theoretical vibrational potential function derived from semiempirical calculations on short oligomers. The dependence of the bandgap energy on the internal rotation about the inter-ring single bond is analyzed theoretically in dimers as model molecules and the results are compared with experiments.Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesHernández, V. ; Casado, J. ; Ramírez, F. J. ; Zotti, G. ; Hotta, Shu ; López Navarrete, J. T.
College Park, Md. : American Institute of Physics (AIP)
Published 1996Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: α,α′-dimethyl substituted oligothiophenes with increasing chain length (from the dimer up to the hexamer) were recently synthesized by chemical methods. In this paper we have investigated the vibrational Fourier transform-IR and Fourier transform-Raman spectra of solid α,α′-dimethyl substituted oligothiophenes in the neutral state. The data are consistent with the existence of a chain-length dependent π electron delocalization: a large frequency dispersion with conjugation length is observed for some Raman and infrared active vibrational modes, particularly at the high-energy side of the aromatic C=C stretching region. Vibrational assignments are proposed for the main vibrational features in the whole spectral range. This vibrational spectroscopic analysis of the solid samples thus becomes a tool for deriving information on the structure of these neutral materials in solution and in the doped state. © 1996 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesHernandez, V. ; Ramirez, F. J. ; Zotti, G. ; Lopez Navarrete, J. T.
College Park, Md. : American Institute of Physics (AIP)
Published 1993Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: The interpretation of the infrared and Raman spectra of polyconjugated polyfuran prepared by electroreduction of 2,5-dibromofuran is presented as the result of lattice dynamical calculations. Geometries and vibrational force fields are derived from semiempirical calculations carried out on oligomers and the parameters are used for the polymer. Finally, it is shown that the infrared and Raman spectra of polyfuran pristine and doped are accounted for by effective conjugation coordinate theory, thus showing that this material also constitutes a polyconjugated material.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesStaff View
ISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: We have studied structural and spectroscopic characteristics on a series of α,α′-dimethyl end-capped oligothiophenes (from two to six thiophene units) by varying temperature. Powder x-ray diffraction and infrared spectra at different temperatures between −170 and 150 °C were recorded. The diffractometric study shows that the thermal expansion coefficients of these materials are highly anisotropic. The expansion in the ab plane, which is perpendicular to the chain direction, is an order of magnitude bigger than that along the chain direction. Corresponding to these structural features, the infrared spectra show interesting temperature dependence. For instance, the separation between adjacent components of the multiplets near 800 cm−1, that are assigned to the C–H out-of-plane bending vibrations, increases with decreasing temperatures. This behavior reflects the change in the intermolecular forces caused by the thermal expansion. Furthermore, the shifts in the C=C stretching vibrations indicate that the extent of the π-electron delocalization increases with increasing temperatures. The origin for this is briefly discussed. © 1998 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesGambino, R. ; Kacian, D. L. ; Ramirez, F. ; Dow, L. W. ; Grossbard, E. ; Natta, C. ; Spiegelman, S. ; Marks, P. A. ; Bank, A.
Oxford, UK : Blackwell Publishing Ltd
Published 1974Staff ViewISSN: 1749-6632Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: Natural Sciences in GeneralType of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesGRAHAM, D. Y. ; LEW, G. M. ; RAMIREZ, F. C. ; GENTA, R. M. ; KLEIN, P. D. ; MALATY, H. M.
Oxford, UK : Blackwell Publishing Ltd
Published 1993Staff ViewISSN: 1365-2036Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Triple therapies using bismuth, metronidazole and tetracycline or amoxicillin were the first truly successful anti-H. pylori therapies. Metronidazole resistance has become an increasing problem that has severely limited the usefulness of the original triple therapy. Resistance to tetracycline or amoxicillin has not been reported and both are effective against H. pylori. We therefore tested a new triple therapy consisting of 500 mg tetracycline, 500 mg amoxicillin, and 2 tablets of bismuth subsalicylate each administered four times daily (with meals and at bedtime) for 14 days during treatment with ranitidine 300 mg daily. H. pylori eradication was defined as no evidence of H. pylori one or more months after stopping therapy. H. pylori status was evaluated by a combination of urea breath test and histology. Sixteen patients with H. pylori infection and active peptic ulcers were enrolled. The new triple therapy was successful in only 7 individuals (43%). Metronidazole appears to be critical for the effectiveness of the original triple therapy. An alternative to metronidazole will be required for a new successful triple therapy.Type of Medium: Electronic ResourceURL: -
11Articles: DFG German National LicensesRamirez, F. C. ; Holland, J. F. ; Harker, J. ; Leung, F. W.
Oxford, UK : Blackwell Science Ltd
Published 2004Staff ViewISSN: 1365-2036Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: Background : In animals, hydrochloric acid increases blood flow and mucus secretion in the duodenal mucosa. A significant correlation between index of haemoglobin oxygen saturation and mucosal blood flow, and between change in index of haemoglobin concentration and mucus thickness, respectively, has been demonstrated by reflectance spectrophotometry.Aim : To examine the effect of topical hydrochloric acid upon mucosal blood flow and mucus secretion in the human duodenum.Methods : This prospective study of 120 patients undergoing routine upper endoscopy, examined the effect of topical 0.1 n hydrochloric acid or 0.9% saline on the duodenal bulb in a randomized, double-blind fashion. Duodenal mucosal index of haemoglobin oxygen saturation and index of haemoglobin concentration were measured by endoscopic reflectance spectrophotometry before and after hydrochloric acid or saline.Results : Baseline index of haemoglobin oxygen saturation, calculated blood flow and index of haemoglobin concentration measurements were comparable between hydrochloric acid (n = 60) and saline (n =60) treated groups. A history of current use of non-steroidal anti-inflammatory drug was associated with a significantly lower baseline index of haemoglobin oxygen saturation and calculated blood flow. Hydrochloric acid resulted in a significant increase in index of haemoglobin oxygen saturation and calculated blood flow, but a decrease in index of haemoglobin concentration, reflecting an increase in mucus thickness compared with saline.Conclusions : Our observations in humans confirm data in animal studies that topical exposure to hydrochloric acid induces an increase in duodenal mucosal blood flow and mucus secretion. Post hoc analysis of the data also revealed that attenuation of basal duodenal mucosal blood flow is associated with a history of current non-steroidal anti-inflammatory drug use. Endoscopic reflectance spectrophotometry appears to be adequate to assess factors that influence duodenal defence mechanisms of blood flow and mucus secretion in humans.Type of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesMONCADA, B. ; KETTELSEN, S. ; HERNÁNDEZ-MOCTEZUMA, J.L. ; RAMIREZ, F.
Oxford, UK : Blackwell Publishing Ltd
Published 1982Staff ViewISSN: 1365-2133Source: Blackwell Publishing Journal Backfiles 1879-2005Topics: MedicineNotes: A neonate with oral lesions of pemphigus vulgaris is described. The diagnosis was confirmed by cytological examination of lesions, positive intercellular IgG staining of the acantholytic cells, and presence of pemphigus antibodies in his serum. At the time of delivery, the child's mother had active pemphigus vulgaris, and it is suggested that this was a case of passively transferred disease.Type of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 0005-2736Keywords: Interfacial catalysis ; Intervesicle exchange ; Intravesicle scooting ; Isothermal phase separation ; Lipid-protein interaction ; Phospholipase A"2Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 0005-2736Keywords: Inhibitor ; Interfacial catalysis ; Intravesicle scooting ; Kinetics ; Phospholipase A"2Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0005-2736Keywords: Kinetics ; Phase property ; Phospholipase A"2 ; Substrate specificitySource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 0005-2736Keywords: Cholesterol ; Energy transfer ; Lipid bilayer ; Membrane order ; Phase transitionSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesNoggle, J.H. ; Marecek, J.F. ; Mandal, S.B. ; van Venetie, R. ; Rogers, J. ; Jain, M.K. ; Ramirez, F.
Amsterdam : ElsevierStaff ViewISSN: 0005-2736Keywords: Phosphatidylcholesterol ; Phosphatidyldiacylglycerol ; Phospholipid bilayer ; ^3^1P-NMRSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesJain, M.K. ; Ramirez, F. ; McCaffrey, T.M. ; Ioannou, P.V. ; Marecek, J.F. ; Leunissen-Bijvelt, J.
Amsterdam : ElsevierStaff ViewISSN: 0005-2736Keywords: (Bilayer) ; Cholesterol ; Cooperativity ; Dipalmitoyl phosphatidylcholine ; Phase transition ; PhospholipidSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesRainier, S. ; Jain, M.K. ; Ramirez, F. ; Ioannou, P.V. ; Marecek, J.F. ; Wagner, R.
Amsterdam : ElsevierStaff ViewISSN: 0005-2736Keywords: Bilayer ; Cardiolipin ; Cation binding ; Phase transition ; PhosphatidylglycerolSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyMedicinePhysicsType of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 0006-291XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: BiologyChemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL:
