Sample records for transfer electron
from WorldWideScience.org

Sample records 1 - 20 shown. Select sample records:



1

ESTUDIO TEÓRICO DE LA REGIOSELECTIVIDAD DE LA BOLDINA EN REACCIONES DE SUSTITUCIÓN AROMÁTICA

Sobarzo-Sánchez, Eduardo; Gómez-Jeria, Juan S.
2002-12-01

Resumen en español RESUMEN La regioselectividad de la boldina frente a reacciones de nitrosación y halogenación con bromo molecular y N-halosuccinimidas (halo = Cl, Br, I) en ácido acético ha sido estudiada. En este sentido, se encontró experimentalmente que la boldina reacciona bromo molecular y N-halo-succinimida obteniéndose mono-productos de reacción en la posición C-3. Dicha sustitución sería atribuible a un mecanismo de transferencia de electrones (ET) provocado por la forma (mas) ción de un radical catiónico persistente en la molécula. Por otro lado, la reacción de nitrosación genera en la boldina un producto sustituido en la posición C-8, siendo atribuible a la formación de un complejo electrón donor-aceptor (EDA) entre la boldina y el catión nitrosonio. La regioquímica en la sustitución aromática es explicada a través de los complejos de Wheland y usando descriptores de reactividad tales como la superdeslocalizabilidad electrofílica y radicalaria Resumen en inglés The nitrosation of boldine with nitrous acid in acetic acid and its halogenation with molecular bromine or N-halosuccinimides (halo = Cl, Br, I) in acetic or trifluoroacetic acid exhibit different regioselectivities. Thus, we found that experimentally boldine proceed with Br2 and N-halosuccinimide affording mono-substituted products in C-3 being attributable to the formation of an electron transfer mechanism (ET) while its nitrosation reaction should proceed by electron t (mas) ransfer within an electron donor-acceptor (EDA) complex that precedes the aromatic substitution step. The regiochemistry of the aromatic substitution is explained by Wheland complex and using reactivity descriptors such as electrophilic and free radical superdelocalizabilites

Scientific Electronic Library Online (Spanish)

2

Zr-metal adhesion on graphenic nanostructures

Sánchez-Paisal, Yon; Sánchez-Portal, Daniel; Garmendia, N.; Muñoz, R.; Obieta, I.; Arbiol, J.; Calvo-Barrio, L.; Ayuela, Andrés
2008-08-04

Digital.CSIC (Spain)

3

XMIPP: a new generation of an open-source image processing package for electron microscopy

Sánchez Sorzano, Carlos Óscar; Marabini, Roberto; Velázquez-Muriel, Javier; Bilbao-Castro, José Román; Scheres, Sjors H. W.; Carazo, José M.; Pascual-Montano, Alberto
2004-08-14

Digital.CSIC (Spain)

4

Transition-state spectroscopy of the photoinduced Ca + CH3F reaction. 3. Reaction following the local excitation to Ca(4s3d 1D)

Gloaguen, Eric; Sanz, Cristina; Collier, M.; Gaveau, M.-A.; Soep, B.; Roncero, Octavio; Mestdagh, J.-M.
2008-01-31

Digital.CSIC (Spain)

5

Transient binding of plastocyanin to its physiological redox partners modifies the copper site geometry

Díaz-Moreno, Irene; Díaz-Quintana, Antonio; Díaz-Moreno, Sofía; Subías, G.; Rosa, Miguel A. de la
2006-11-13

Digital.CSIC (Spain)

6

Thrombin-Binding Aptamer Quadruplex Formation: AFM and Voltammetric Characterization

Diculescu, Victor Constantin; Chiorce-Paquim, Ana-Maria; Eritja Casadellà, Ramón; Oliveira-Bret, Ana Maria
2010-01-01

Digital.CSIC (Spain)

7

The unique proline of the Prochlorothrix hollandica plastocyanin hydrophobic patch impairs electron transfer to photosystem I

Navarro, José A.; Myshkin, Eugene; Rosa, Miguel A. de la; Bullerjahn, George S.; Hervás, Manuel

5 pages, 5 figures, 3 tables.-- PMID: 11457853 [PubMed].-- Printed version published on Oct 5, 2001. | A number of surface residues of plastocyanin from Prochlorothrix hollandica have been modified by site-directed mutagenesis. Changes have been made in amino acids located in the amino-terminal hydr...

DRIVER (Spanish)

8

The unique proline of the Prochlorothrix hollandica plastocyanin hydrophobic patch impairs electron transfer to photosystem I

Navarro Carruesco, José Antonio; Myshkin, Eugene; Rosa, Miguel A. de la; Bullerjahn, George S.; Hervás, Manuel
2001-07-16

Digital.CSIC (Spain)

9

The influence of single-walled carbon nanotube functionalization on the electronic properties of their polyaniline composites

Lafuente, Esperanza; Callejas, M. Alicia; Sainz, Raquel; Benito, Ana M; Maser, Wolfgang K; Sanjuán, María Luisa; Saurel, Damien; De Teresa, Jose María; Martinez, M. Teresa
2008-08-08

Digital.CSIC (Spain)

10

The atypical iron-coordination geometry of cytochrome f remains unchanged upon binding to plastocyanin, as inferred by XAS

Díaz-Moreno, Irene; Díaz-Moreno, Sofía; Subías, G.; Rosa, Miguel A. de la; Díaz-Quintana, Antonio
2006-10-01

Digital.CSIC (Spain)

13

The Long and Short Flavodoxins. I. i. the role of the differentiating loop in apoflavodoxin structure and fmn

López-Llano, Jon; Maldonado, Susana; Bueno, Marta; Lostao, Anabel; Jiménez, Maria Ángeles; Lillo, M. Pilar

Flavodoxins are well known one-domain / electron-transfer proteins that, according to the presence or absence of a 20-residue loop splitting the fifth -strand of the central -sheet, have been classified in two groups: long and short-chain flavodoxins, respectively. Although the flavodoxins have been...

DRIVER (Spanish)

14

The Long and Short Flavodoxins. I. i. the role of the differentiating loop in apoflavodoxin structure and fmn

López-Llano, Jon; Maldonado, Susana; Bueno, Marta; Lostao, Anabel; Jiménez, María Ángeles; Lillo, M. Pilar; Sancho, Javier
2004-08-17

Digital.CSIC (Spain)

15

The CP43 Proximal Antenna Complex of Higher Plant Photosystem II Revisited: Modeling and Hole Burning Study. I

Dang, Nhan C.; Zazubovich, Valter; Reppert, Mike; Neupane, Bhanu; Picorel Castaño, Rafael; Seibert, Michael; Jankowiak, Ryszard
2008-08-01

Digital.CSIC (Spain)

16

Synthesis, characterization and photoinduction of optical anisotropy in liquid crystalline diblock azo-copolymers.

Forcén, Patricia; Oriol, Luis; Sánchez, Carlos; Alcalá, Rafael; Hvilsted, Søren; Jankova, Katja; Loos, J.
2007-04-03

Digital.CSIC (Spain)

17

Syntheses and quadratic nonlinear optical properties of salts containing benzothiazolium electron-acceptor groups

Coe, Benjamin J.; Harris, James A.; Hall, Jonathan J.; Brunschwig, Bruce S.; Hung, Sheng-Ting; Libaers, Wim; Clays, Koen; Coles, Simon J.; Horton, Peter N.; Light, Mark E.; Hursthouse, Michael B.; Garín, Javier; Ordun, Jesús
2006-11-11

Digital.CSIC (Spain)

18

Surface plasmon resonance and magnetism of thiol-capped gold nanoparticles

Guerrero, Estefanía; Muñoz-Márquez, Miguel Ángel; García, M. A.; Crespo, Patricia; Fernández-Pinel, Enrique; Hernando, Antonio; Fernández Camacho, Asunción
2008-04-30

Digital.CSIC (Spain)

19

Superscaling in nuclei: A search for a scaling function beyond the relativistic Fermi gas model

Antonov, A.N.; Gaidarov, M.K.; Kadrev, D.N.; Ivanov, M.V.; Moya de Guerra, Elvira; Udias, J.M.
2004-04-30

Digital.CSIC (Spain)

21

Search for stable octupole deformation in Fr-225

Burke, D. G.; Kurcewicz, W.; Løvhøiden, G.; García Borge, María José; Cronqvist, M.; Gabelmann, H.; Gietz, H.

52 pages, 11 figures, 10 tables.-- PACS nrs.: 23.20.−g; 23.20.Lv; 25.45.Hi; 25.55.−e; 27.90.+b. | Levels in Fr-225 have been studied by gamma-ray and conversion-electron spectroscopy following the beta-decay of Rn-225 and by the Ra-226(t,alpha)Fr-225 single-proton-pickup reaction. Multipolarities we...

DRIVER (Spanish)

22

Samarium Diiodide Mediated Reductive Coupling of Epoxides and Carbonyl Compounds: A New Stereocontrolled Synthesis of C-Glycosides from 1,2-Anhydro Sugars

Chiara, José Luis; Sesmillo, Esther

The significant advances in the understanding of the biological function of carbohydrates and glycoconjugates achieved during the last two decades have stimulated the development of glycomimetics as fundamental tools for biological research and as potential agents for therapeutic intervention. C-Gly...

DRIVER (Spanish)

23

Role of hydrophobic interactions in the flavodoxin mediated electron transfer from photosystem I to ferredoxin-NADP+ reductase in Anabaena PCC 7119

Nogués, Isabel; Martínez-Júlvez, Marta; Navarro, José Antonio; Hervás, Manuel; Armenteros, Lorena; Rosa, Miguel Angel de la

10 pages, 5 figures, 4 tables.-- PMID: 12590591 [PubMed].-- Printed version published on Feb 25, 2003. | Hydrophobic interactions play an active role in effective complex formation between ferredoxin-NADP+ reductase (FNR) and ferredoxin (Fd) from Anabaena, where an aromatic amino acid residue on the...

DRIVER (Spanish)

24

Role of hydrophobic interactions in the flavodoxin mediated electron transfer from photosystem I to ferredoxin-NADP+ reductase in Anabaena PCC 7119

Nogués, Isabel; Martínez-Júlvez, Marta; Navarro Carruesco, José Antonio; Hervás, Manuel; Armenteros, Lorena; Rosa, Miguel A. de la; Brodie, Tammy B.; Hurley, John K.; Tollin, Gordon; Gómez-Moreno, Carlos; Medina, Milagros
2003-01-23

Digital.CSIC (Spain)

26

Reducing power of simple polyphenols by electron-transfer reactions using a new stable radical of the PTM series, tris(2,3,5,6-tetrachloro-4-nitrophenyl)methyl radical

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi

7 pages, 3 figures.-- PMID: 17439176 [PubMed].-- Supporting information (Figs. S1-S13 and X-ray Crystallographic Information) available at: http://pubs.acs.org/doi/suppl/10.1021/jo062665a | Printed version published on May 11, 2007. | The synthesis and characterization of a new radical and its use f...

DRIVER (Spanish)

27

Reducing power of simple polyphenols by electron-transfer reactions using a new stable radical of the PTM series, tris(2,3,5,6-tetrachloro-4-nitrophenyl)methyl radical

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi; Juliá, Lluís
2007-04-17

Digital.CSIC (Spain)

29

Reducing Power of Simple Polyphenols by Electron-Transfer Reactions Using a New Stable Radical of the PTM Series, Tris (2,3,5,6-tetrachloro-4-nitrophenyl)methyl Radical.

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi

7 pages, 3 figures.-- PMID: 17439176 [PubMed]. | Supporting information (15 pages) available at: http://pubs.acs.org/doi/suppl/10.1021/jo062665a/suppl_file/jo062665asi20070314_072402.pdf | Supplementary Crystallographic Information File available at: http://pubs.acs.org/doi/suppl/10.1021/jo062665a/s...

DRIVER (Spanish)

30

Reducing Power of Simple Polyphenols by Electron-Transfer Reactions Using a New Stable Radical of the PTM Series, Tris (2,3,5,6-tetrachloro-4-nitrophenyl)methyl Radical.

Torres, Josep Lluís; Carreras, Anna; Jiménez, Aurora; Brillas, Enric; Torrelles, Xavier; Rius, Jordi; Juliá, Lluís
2007-04-17

Digital.CSIC (Spain)

31

Reaction center of photosystem II with no peripheral pigments in D2 allows secondary electron transfer in D1

Arellano, Juan B.; González-Pérez, Sergio; Vácha, Frantisek; Melo, Thor Bernt; Naqvi, K. Razi

DRIVER (Spanish)

32

Reaction center of photosystem II with no peripheral pigments in D2 allows secondary electron transfer in D1

Arellano, Juan B.; González-Pérez, Sergio; Vácha, Frantisek; Melo, Thor Bernt; Naqvi, K. Razi
2007-12-01

Digital.CSIC (Spain)

34

Predator and prey body sizes in marine food webs

Barnes, C.; Bethea, D. M.; Brodeur, R. D.; Spitz, J.; Ridoux, V.; Pusineri, C.; Chase, B. C.; Hunsicker, M. E.; Juanes, F.; Kellermann, A.; Lancaster, J.; Ménard, F.; Bard, F.-X.; Munk, P.; Pinnegar, J. K.; Scharf, F. S.; Rountree, R. A.; Stergiou, K. I.; Sassa, C.; Sabatés, Ana; Jennings, S.
2008-06-01

Digital.CSIC (Spain)

37

Pentacyanoiron(II) as an electron donor group for nonlinear optics: medium-responsive properties and comparisons with related pentaammineruthenium(ii) complexes.

Coe, Benjamin J.; Harries, Josephine L.; Helliwell, Madeleine; Jones, Lathe A.; Asselberghs, Inge; Clays, Koen; Brunschwig, Bruce S.; Harris, James A.; Garín, Javier; Orduna, Jesús
2006-08-24

Digital.CSIC (Spain)

38

Optical, Redox, and NLO Properties of Tricyanovinyl Oligothiophenes: Comparisons between Symmetric and Asymmetric Substitution Patterns

Casado, Juan; Ruiz Delgado, M. Carmen; Rey Merchán, M. Carmen; Hernández, Víctor; López Navarrete, Juan T.; Pappenfus, Ted M.; Williams, Nathaniel; Stegner, William J.; Johnson, Jared C.; Edlund, Brett A.; Janzen, Daron E.; Mann, Kent R.; Orduna, Jesús; Villacampa, Belén
2006-04-21

Digital.CSIC (Spain)

39

Optical spectroscopy of Pr3+ in M+Bi(XO4)2, M+ = Li or Na and X = W or Mo, locally disordered single crystals

Mendez-Blas, Antonio; Rico, Mauricio; Volkov, Vladimir; Cascales, Concepcion; Zaldo, Carlos; Coya, Carmen; Kling, Andreas; Alves, L. C.
2004-03-31

Digital.CSIC (Spain)

40

Off-axis aberrations of a wide-angle schematic eye model

Escudero-Sanz, Beatriz; Navarro, Rafael
1999-08-01

Digital.CSIC (Spain)

41

Nuclear isospin mixing and elastic parity-violating electron scattering

Moreno, Oscar; Sarriguren, Pedro; Moya de Guerra, Elvira; Udias, J.M.; Donnelly, T.W.; Sick, I.
2009-09-15

Digital.CSIC (Spain)

43

New Transmembrane Polyene Bolaamphiphiles as Fluorescent Probes in Lipid Bilayers

Quesada, Ernesto; Acuña Fernandez, Alberto Ulises; Amat-Guerri, Francisco
2001-05-28

Digital.CSIC (Spain)

44

New Insight into the Gas-Phase Bimolecular Self-Reaction of the HOO Radical

Anglada Rull, Josep M.; Olivella, Santiago; Sol, Albert
2007-10-02

Digital.CSIC (Spain)

45

Mössbauer spectral study of the RFe11.5Ta0.5 (R=Tb, Dy, Ho, Er, and Lu) compounds

Piquer, Cristina; Rubín, Javier; Bartolomé, Juan; Kuncser, Victor; Filoti, George
2006-05-01

Digital.CSIC (Spain)

46

Mutagenesis of prochlorothrix plastocyanin reveals additional features in photosystem I interactions

Hervás, Manuel; Myshkin, Eugene; Vintonenko, Nadejda; Rosa, Miguel A. de la; Bullerjahn, George S.; Navarro Carruesco, José Antonio
2003-03-07

Digital.CSIC (Spain)

48

Molecular photoreactivity on metal-oxide surfaces from first-principles: photocathalysis and photovoltaics

Lara Castells, M. Pilar de; Aguirre Castiblanco, Néstor Fabián; López Durán, David; Ortega Mateo, José; Mitrushchenkov, Alexander O.
2010-02-01

Digital.CSIC (Spain)

49

Modulation transfer of the human eye as a function of retinal eccentricity

Navarro, Rafael; Artal, Pablo; Williams, David R.
1993-02-01

Digital.CSIC (Spain)

50

Modulation transfer functions of eyes implanted with intraocular lenses

Navarro, Rafael; Ferro, Manuel; Artal, Pablo; Miranda, Ismael
1993-11-01

Digital.CSIC (Spain)

54

Magnetic polarization of copper in Cu-capped Co clusters.

García, L. M.; Bartolomé, Fernando; Bartolomé, Juan; Luis, F.; Petroff, F.; Deranlot, C.; Wilhelm, F.; Rogalev, A.; Bencok, P.; Brookes, N. B.
2007-09-01

Digital.CSIC (Spain)

55

Madurez de las vellosidades coriales en relación con malformaciones del tubo neural durante el tercer trimestre del embarazo

Castejón, Olivar C; Luzardo, Canache; Rivas, Alba E; Santiago, Miguelangel; Lugo, Juan; Sifontes, Carlos
2006-12-01

Resumen en español Objetivo: Evaluar las características que determinan el grado de desarrollo de la vellosidad placentaria en los casos de las malformaciones del tubo neural. Ambiente: Laboratorio de microscopia electrónica del CIADANA, Maracay. Métodos: Se utilizó un protocolo de observación, usando la microscopía de luz, basado en los tipos de vellosidades y de membranas vásculosincitiales; incremento de citotrofoblastos, calcificación y puentes sincitiales en los casos de acrane (mas) o-excencefalia; cráneo-raquisquisis con trisomía 18, mielomeningocele con hidrocefalia asociada con otras malformaciones congénitas, mielomeningocele lumbar, anencefalia y malformación de Chiari tipo II apareando con controles a la misma edad gestacional sin malformaciones. Resultados: Las cifras en porcentaje de vellosidades maduras e inmaduras y de membranas vásculosincitiales periféricas o centrales exhiben variaciones según la malformación con predominio de inmaduras. Se encontró daño hipóxico velloso extenso. Conclusión: Estos resultados revelaron inmadurez vellosa persistente correspondiéndose con mala perfusión placentaria y disfunción de la capacidad de transferencia. Estos hallazgos son de interés cuando otros test como la determinación de alfafetoproteínas y estudios ultrasonográficos son empleados al brindar información adicional útil en el diagnóstico complementario. Resumen en inglés Objective: To evaluate the characteristics which determine the level of development of placental villi in the cases of defects of the neural tube. Setting: Laboratory of electron microscopy, CIADANA, Maracay. Methods: An observational protocol was performed with the use of light microscopy, based on the types of villi and vasculosyncytial membranes; increase of cytotrophoblast cells, calcification and syncytial bridges in the cases of acranium-excencephaly, cranium rachis (mas) chisis-trisomy 18, mielomeningocelehydrocephaly with inherited malformations, mielomeningocele lumbar, anencephaly and Chiari II´s malformation. Controls without malformations and at the same gestational age were employed. Results: The percent of mature or immature villi and of peripheral or central vasculosyncytial membranes exhibited variability according to the malformation type with a predominance of immature villi. Extensive hypoxic villous damage was revealed. Conclusion: Lessen placental perfusion and dysfunction of the transfer capacity is correlated with persistent villous immaturity. These results are of interest when tests such as the determination of alphafetoproteins and ultrasonographic studies are employed in the complementary additional diagnostic.

Scientific Electronic Library Online (Spanish)

56

Macromolecular polyradicals with cyclic triphosphazene as a core. Spectral and electrochemical properties

Carriedo, Gabino A.; García Alonso, Francisco J.; Gómez Elipe, P.; Brillas, Enric; Labarta, Amílcar; Juliá, Lluís
2004-01-09

Digital.CSIC (Spain)

57

Local transfer of angular momentum to matter

Zambrini, Roberta; Barnett, Stephen M.
2005-06-01

Digital.CSIC (Spain)

58

Local transfer of angular momentum to matter

Zambrini, Roberta; Barnett, Stephen M.
2005-05-20

Digital.CSIC (Spain)

59

Laser flash-induced kinetic analysis of cytochrome f oxidation by wild-type and mutant plastocyanin from the cyanobacterium Nostoc sp. PCC 7119

Albarrán, Cristina; Navarro Carruesco, José Antonio; Molina-Heredia, Fernando P.; Murdoch, Piedad del S.; Rosa, Miguel A. de la; Hervás, Manuel
2005-08-30

Digital.CSIC (Spain)

63

Intramolecular electron transfer between ferredoxin-NADP+ reductase and flavodoxin: a laser photolysis study

Pueyo, José J.; Walker, Mark C.; Tollin, Gordon; Gómez-Moreno, Carlos
1990-01-01

Digital.CSIC (Spain)

64

Interaction of flavodoxin with cyanobacterial thylakoids

Pueyo, José J.; Gómez-Moreno, Carlos
1993-01-01

Digital.CSIC (Spain)

66

Hydrogen Transfer between Sulfuric Acid and Hydroxyl Radical in the Gas Phase: Competition among Hydrogen Atom Transfer, Proton-Coupled Electron-Transfer, and Double Proton Transfer

Anglada Rull, Josep M; Olivella, Santiago; Solé, Albert

9 pages, 2 tables, 1 scheme. | In an attempt to assess the potential role of the hydroxyl radical in the atmospheric degradation of sulfuric acid, the hydrogen transfer between H2SO4 and HO• in the gas phase has been investigated by means of DFT and quantum-mechanical electronic-structure calculatio...

DRIVER (Spanish)

68

Functional characterization of the evolutionarily divergent fern plastocyanin

Navarro Carruesco, José Antonio; Lowe, Christian E.; Amons, Reinout; Kohzuma, Takamitsu; Canters, Gerard W.; Rosa, Miguel A. de la; Ubbink, Marcellus; Hervás, Manuel
2004-07-30

Digital.CSIC (Spain)

69

Front-End electronics development for the new Resistive Plate Chamber detector of HADES

Gil Ortiz, Alejandro; Belver, D.; Cabanelas, P.; Díaz Medina, José; Garzón, J. A.; González-Díaz, D.; Koenig, W.; Lange, J. S.; Marín, J.; Montes, N.; Skott, P.; Traxler, M.
2007-11-13

Digital.CSIC (Spain)

70

Flavodoxin-mediated electron transfer from photosystem I to ferredoxin-NADP+ reductase in Anabaena: role of flavodoxin hydrophobic residues in protein-protein interactions

Goñi, Guillermina; Serrano, Ana; Frago, Susana; Hervás, Manuel; Peregrina, José Ramón; Rosa, Miguel A. de la

11 pages.-- PMID: 18177021 [PubMed].-- Printed version published Jan 29, 2008. | Three surface hydrophobic residues located at the Anabaena flavodoxin (Fld) putative complex interface with its redox partners were replaced by site-directed mutagenesis. The effects of these replacements on Fld interac...

DRIVER (Spanish)

71

Flavodoxin-mediated electron transfer from photosystem I to ferredoxin-NADP+ reductase in Anabaena: role of flavodoxin hydrophobic residues in protein-protein interactions

Goñi, Guillermina; Serrano, Ana; Frago, Susana; Hervás, Manuel; Peregrina, José R.; Rosa, Miguel A. de la; Gómez-Moreno, Carlos; Navarro Carruesco, José Antonio; Medina, Milagros
2008-01-05

Digital.CSIC (Spain)

72

Flavin Adenine Dinucleotide Rescues the Phenotype of Frataxin Deficiency

Gonzalez-Cabo, Pilar; Ros Cantera, Sheila; Palau Martínez, Francesc
2010-01-25

Digital.CSIC (Spain)

73

Ferredoxins and ferredoxin-NADP+ Reductases from Anabaena PCC 7119 and Spinach: electrostatic effects on intracomplex electron transfer

Walker, Mark C.; Navarro, José A.; Pueyo, José J.; Gómez-Moreno, Carlos; Tollin, Gordon
1990-01-01

Digital.CSIC (Spain)

74

Extended Hückel theory for band structure, chemistry, and transport. II. Silicon

Kienle, D.; Bevan, K. H.; Liang, G. C.; Siddiqui, L.; Cerdá, J. I.; Ghosh, A. W.
2006-08-29

Digital.CSIC (Spain)

75

Expresión y actividad de posibles polimorfismos provenientes de individuos normales en la proteína de 67 kd del sistema NADPH oxidasa utilizando el sistema COS phox/ Expression and activity of polymorphisms in the 67-kDa protein of the NADPH oxidase system

Arias, Andrés Augusto; Dinauer, Mary C; Ding, Jiabin; Matute, Juan David; Patiño, Pablo Javier
2004-09-01

Resumen en español El sistema NADPH oxidasa de las células fagocíticas cumple una función importante durante la respuesta antimicrobiana del organismo. La activación de este sistema está precedida por la translocación de las proteínas citosólicas p67 phox , p47 phox y p40 phox hacia la membrana para ponerse en contacto con el flavocitocromo b 558 , lo que induce la generación del anión superóxido, un precursor de agentes microbicidas oxidantes. El presente trabajo presenta un an� (mas) �lisis funcional del sistema NADPH oxidasa basado en los hallazgos de polimorfismos encontrados en el gen de p67 phox de individuos sanos. Para esto se generaron mutaciones en el cADN que codifica la p67 phox y se expresaron en el sistema de células COS phox . Los datos obtenidos en el presente trabajo indican que los cambios Val 166 .Ile, Pro 329 .Ser y His 389 .Gln no generan alteraciones en el funcionamiento de la p67 phox cuando su función se analizó en el sistema transgénico basado en células COS-7. Por lo tanto, estos polimorfismos no generan ningún riesgo genético de producir deficiencias en la activación del sistema NADPH oxidasa. Además, se demuestra que el modelo de células COS phox representa un nuevo sistema celular, fácilmente transfectable que permite estudiar la función del sistema NADPH oxidasa de las células fagocíticas y sus particularidades genéticas. Finalmente, los hallazgos con estos polimorfismos nos permiten avanzar en el conocimiento sobre los mecanismos moleculares involucrados en la activación del sistema NADPH oxidasa células fagocíticas. Resumen en inglés The NADPH oxidase system plays a central role in the antimicrobial activity of phagocytes. This system is initiated by the translocation of cytosolic proteins p67 phox , p47 phox and p40 phox to be in close contact with membrane flavocytochrome b 558 . This event begins the electron transfer from cytosolic NADPH to molecular oxygen to produce superoxide anions. Herein, a functional analysis is presented of p67 phox polymorphisms identified from healthy humans. Mutations w (mas) ere generated in the p67 phox cDNA by site-directed mutagenesis and then transiently expressed in COS7 cells that also expressed gp91 phox , p22 phox , and p47 phox from stable transgenes. The changes Val166Ile, Pro329Ser and His389Gln correspond to possible polymorphisms identified in healthy individuals revealed a functional activity similar to COS phox cells transiently transfected with WT p67 phox ; therefore, these modifications are not associated with genetic deficiencies in NADPH oxidase. In conclusion, the COS phox system represents an easily transfectable model for analysis of NADPH oxidase function in intact cells. The analysis of mutant derivatives of p67 phox provides insight into molecular mechanisms by which this subunit regulates the NADPH oxidase.

Scientific Electronic Library Online (Spanish)

76

Estudio de la miscibilidad, morfología y cristalización de las mezclas POLI(P-DIOXANONA)-POLI(E-CAPROLACTONA) (PPDX/PCL)

Brito, Yelitza; Sabino, Marco A; Ronca, Gladys; Albuerne, Julio; Müller, Alejandro J
2006-01-01

Resumen en español En este trabajo se reporta la preparación de una nueva mezcla biodegradable de materiales poliméricos compuesta por Poli(p-dioxanona) y Poli(e-caprolactona) en un rango amplio de composiciones. Primeramente se prepararon mezclas de materiales comercialmente disponibles de alto peso molecular, las cuales resultaron ser inmiscibles. La inmiscibilidad quedó demostrada por la invariabilidad de las transiciones térmicas relevantes determinadas mediante Calorimetría Difere (mas) ncial de Barrido (DSC), y por la morfología de dos fases observada en el rango microscópico tanto por Microscopía Electrónica de Barrido (MEB) como por Microscopia Óptica de Luz Polarizada (MOLP). Adicionalmente, la superestructura esferulítica de cada fase permaneció inalterada por la presencia de la otra fase, así como también no se modificó la velocidad de crecimiento esferulítico de la fase de PPDX. Estas mezclas de alto peso molecular se intentaron compatibilizar por varias estrategias sin resultados positivos. El estudio de la miscibilidad también se extendió a la mezcla de PPDX y PCL de pesos moleculares bajos con y sin la adición de un copolímero en bloque PPDX-b-PCL de peso molecular comparable. Aun bajo estas condiciones termodinámicamente mucho más favorables, las mezclas no mostraron evidencias de miscibilidad, lo cual resulta notable en vista de la estructura química similar que presentan. Aún cuando las mezclas son termodinámicamente inmiscibles, se detectaron interacciones físicas tales como fenómenos de aparente transferencia de impurezas y un efecto nucleante de la PPDX sobre la PCL en cierto rango de composiciones. Adicionalmente, la dispersión en fases lograda causó fenómenos de cristalización fraccionada en ambas fases. Resumen en inglés This work reports the preparation of a novel biodegradable polymer blend composed by Poly(p-dioxanone) and Poli(e-caprolactone) in a wide composition range. Firstly, blends of high molecular weight materials commercially available were prepared and these turned out to be immiscible. The immiscibility was demonstrated by the lack of variation of the relevant thermal transitions determined by Differential Scanning Calorimetry (DSC) and by the two phase morphology that was o (mas) bserved by Scanning Electron Microscopy (SEM) and by Polarized Light Optical Microscopy (PLOM). Additionally, the spherulitic superstructure of each phase remained unaltered besides the presence of the second phase and no modification of the spherulitic growth rate of the PPDX phase was found. Attempts to try to compatibilize these high molecular weight blends by several strategies were unsuccessful. The miscibility study was also extended to low molecular weight PPDX and PCL without and with the addition of a PPDX-b-PCL diblock copolymer of comparable molecular weight. Even under these more favourable conditions the blends were still immiscible, a fact that is surprising in view of their similar chemical structure. Even though the blends are themodinamically immiscible, physical interactions between the components were detected like apparent impurities transfer and a nucleating effect of the PPDX on the PCL in a certain composition range. Additionally, the phase dispersion obtained caused fractionated crystallization phenomena in both phases.

Scientific Electronic Library Online (Spanish)

77

Error analysis in the determination of the electron microscopical contrast transfer function parameters from experimental power Spectra

Sánchez Sorzano, Carlos Óscar; Otero, Abraham; Olmos, Estefanía M.; Carazo, José M.

16 pages, 4 figures, 4 tables.-- PMID: 19321015 [PubMed].-- PMCID: PMC2683171. | [Background] The transmission electron microscope is used to acquire structural information of macromolecular complexes. However, as any other imaging device, it introduces optical aberrations that must be corrected if ...

DRIVER (Spanish)

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79

Engineering and applications of fungal laccases for organic synthesis

Kunamneni, Adinarayana; Camarero, Susana; García-Burgos, Carlos; Plou, Francisco J.; Ballesteros, Antonio; Alcalde, Miguel
2008-01-01

Digital.CSIC (Spain)

80

Engineering and Applications of fungal laccases for organic synthesis

Kunamneni, Adinarayana; Camarero, Susana; García-Burgos, Carlos; Plou Gasca, Francisco José; Ballesteros, Antonio; Alcalde Galeote, Miguel
2008-11-20

Digital.CSIC (Spain)

81

Energy-dispersive EXAFS to study chemical reactions: the case of electron transfer reaction of hydroquinone

Díaz-Moreno, Sofía; Evans, J.; Perruchena, J. I.; Díaz-Moreno, Irene; Neisius, T.
2001-01-01

Digital.CSIC (Spain)

82

Emission cross sections and spectroscopy of Ho3+ laser channels in KGd(WO4)2 single crystal

Pujol, Maria Cinta; Massons, Jaume; Aguilo, Magdalena; Diaz, Francisco; Rico, Mauricio; Zaldo, Carlos
2002-01-01

Digital.CSIC (Spain)

83

Electrostatic strain and concerted motions in the transient complex between plastocyanin and cytochrome f from the cyanobacterium Phormidium laminosum

Díaz-Moreno, Irene; Muñoz-López, F. J.; Frutos-Beltrán, Estrella; Rosa, Miguel A. de la; Díaz-Quintana, Antonio
2009-11-01

Digital.CSIC (Spain)

84

Electronic, optical, and vibrational properties of bridged dithienylethylene-based NLO chromophores

Ruiz Delgado, M. Carmen; Casado, Juan; Hernández, Víctor; López Navarrete, Juan T.; Orduna, Jesús; Villacampa, Belén; Alicante, Raquel; Raimundo, Jean-Manuel; Blanchard, Philippe; Roncali, Jean
2008-02-05

Digital.CSIC (Spain)

85

Electron-transfer capacity of catechin derivatives and influence on the cell cycle and apoptosis in HT29 cells

Lozano, Carles; Julià, Lluís; Jiménez, Aurora; Touriño, Sonia; Centelles, Josep J.; Cascante, Marta

12 pages, 5 figures, 2 tables. | Galloylated and nongalloylated catechin conjugates with cysteine derivatives have been synthesized and evaluated for their capacity to scavenge free radicals and to influence crucial functions (cell cycle, apoptosis) in HT29 colon carcinoma cells. We show that the no...

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86

Electron-transfer capacity of catechin derivatives and influence on the cell cycle and apoptosis in HT29 cells

Lozano, Carles; Juliá, Lluís; Jiménez, Aurora; Touriño, Sonia; Centelles, Josep J.; Cascante, Marta; Torres, Josep Lluís
2006-06-01

Digital.CSIC (Spain)

87

Electron transfer to sulfides and disulfides: intrinsic barriers and relationship between heterogeneous and homogeneous electron-transfer kinetics

Meneses, Ana Belén; Antonello, Sabrina; Arévalo, Maria Carmen; González Martín, Concepción C.; Sharma, Jadab

13 pages, 7 figures, 5 tables.-- PMID: 17616962 [PubMed]. | The electron-acceptor properties of series of related sulfides and disulfides were investigated in N,N-dimethylformamide with homogeneous (redox catalysis) and/or heterogeneous (cyclic voltammetry and convolution analysis) electrochemical t...

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88

Electron transfer to sulfides and disulfides: intrinsic barriers and relationship between heterogeneous and homogeneous electron-transfer kinetics

Meneses, Ana Belén; Antonello, Sabrina; Arévalo, Maria Carmen; González Martín, Concepción C.; Sharma, Jadab; Wallette, Andrea N.; Workentin, Mark S.; Maran, Flavio
2007-07-06

Digital.CSIC (Spain)

89

Electron transfer between membrane complexes and soluble proteins in photosynthesis

Hervás, Manuel; Navarro, José A.; Rosa, Miguel A. de la

8 pages, 8 figures.-- PMID: 14567714 [PubMed].-- Printed version published on Oct 21, 2003. | Photosynthesis consists of a series of endergonic redox reactions, with light as the source of energy, chlorophyll as the energy converter, and electrons flowing through membrane and soluble proteins. Here,...

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90

Electron transfer between membrane complexes and soluble proteins in photosynthesis

Hervás, Manuel; Navarro Carruesco, José Antonio; Rosa, Miguel A. de la
2003-07-25

Digital.CSIC (Spain)

91

Electromagnetic form-factors of odd-A rotational nuclei

Sarriguren, Pedro; Graca, E.; Sprung, D.W.L.; Moya de Guerra, Elvira; Berdichevsky, D.
1989-09-01

Digital.CSIC (Spain)

92

Effects of aging in retinal image quality

Artal, Pablo; Ferro, Manuel; Miranda, Ismael; Navarro, Rafael
1993-07-01

Digital.CSIC (Spain)

93

Double-pass and interferometric measures of the optical quality of the eye

Williams, David R.; Brainard, David H.; MacMahon, Matthew J.; Navarro, Rafael
1994-12-01

Digital.CSIC (Spain)

94

Different Modes of Interaction in Cyanobacterial Complexes of Plastocyanin and Cytochrome f

Díaz-Moreno, Irene; Díaz-Quintana, Antonio; Rosa, Miguel A. de la; Crowley, Peter B.; Ubbink, Marcellus
2005-02-01

Digital.CSIC (Spain)

95

Detecting Individual Electrons Using a Carbon Nanotube Field-Effect Transistor

Gruneis, Andreas; Esplandiú, María J.; García-Sánchez, Daniel; Bachtold, Adrian
2007-11-21

Digital.CSIC (Spain)

96

Coupled Triple Phase Boundary Processes: Liquid | Liquid Generator - Collector Electrodes

Vagin, Mikhail Yu; Karyakin, Arkady A.; Vuorema, Anne; Sillanpaa, Mika; Meadows, Helen; del Campo, F. Javier; Cortina-Puig, Montserrat; Bulman Page, Phillip C.; Chan, Yohan; Marken, Frank
2010-01-01

Digital.CSIC (Spain)

97

Corrosión microbiológica en aceros de bajo carbono/ Microbiological Corrosion in Low Carbon Steels

Medina-Custodio, O; Ortiz-Prado, A; Jacobo-Armendáriz, V.H.; Schouwenaars-Franssens, R
2009-03-01

Resumen en español La corrosión microbiológica es un tipo común de deterioro que afecta diversas industrias, una de ellas es la petrolera en la que se estiman que el 20% o 30% de fallas en las tuberías de trasporte de hidrocarburos es favorecida por microorganismos. Las reacciones químicas que sustentan éstos, generan transferencia de iones, lo que justifica el empleo de técnicas electroquímicas para su análisis. En este trabajo, se estudiaron probetas de acero de bajo carbono SAE (mas) 1018, sumergidas en un medio nutritivo rico en cloruros en presencia y ausencia de tres diferentes cargas microbianas, en tiempos de exposición de 48 horas y 28 días. Se realizaron ensayos de resistencia a la polarización (Rp) y espectroscopia de impedancia electroquímica (EIS) para determinar el efecto corrosivo de los diferentes sistemas. Los resultados muestran que el medio abiótico causa el mayor efecto corrosivo, lo que indica un efecto protector de los microorganismos al metal, contradiciendo la hipótesis inicialmente propuesta. La observación de las superficies en el microscopio electrónico de barrido (MEB) apoyan lo obtenido por las técnicas electroquímicas. Para explicar la disminución de la corrosividad del medio en presencia de microorganismos se propone un posible mecanismo de polarización catódica. Resumen en inglés The Microbiologically Induced Corrosion affects several industries, such as oil industry where it is estimated that 20% to 30% pipes failures are related with microorganism . The chemical reactions generate ions transfer, this validate the use of electrochemical techniques for its analysis. Coupons submerged in a nutritional medium with presence and absence of three different microorganisms during two periods, 48 hours and 28 days we restudied. Polarization resistance (Rp (mas) ) and Electrochemical Impedance Spectroscopy (EIS) techniques we re applied to determine the corrosivity of the systems. The results show a greater corrosive effect of abiotic system, this indicates a microorganisms protection effect to the metal, opposite to the first hypothesis. This result was ratified observing surfaces coupons by using Scanning Electron Microscopy (SEM) technique. A possible mechanism based on Evans - Tafel graph is proposed to explain inhibitor microorganism effect.

Scientific Electronic Library Online (Spanish)

98

Copper(II) inhibition of electron transfer through photosystem II studied by EPR spectroscopy.

Jegerschöld, Caroline; Arellano, Juan B.; Schröder, Wolfgang P.; van Kan, Paul J. M.; Barón, Matilde

EPR spectroscopy was applied to investigate the inhibition of electron transport in photosystem II by Cu2+ ions. Our results show that Cu2+ has inhibitory effects on both the donor and the acceptor side of photosystem II. In the presence of Cu2+, neither EPR signal IIvery fast nor signal IIfast, whi...

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99

Copper(II) inhibition of electron transfer through photosystem II studied by EPR spectroscopy.

Jegerschöld, Caroline; Arellano, Juan B.; Schröder, Wolfgang P.; van Kan, Paul J. M.; Barón Ayala, Matilde; Styring, Stenbjörn
1995-10-01

Digital.CSIC (Spain)

100

Control of Diastereoselectivity in C=O/C=N Reductive Cyclizations Using an Intramolecularly Tethered Hydrazone

Chiara, José Luis; García, Ángela

Cyclic hydrazones are efficient ketyl radical acceptors in reductive coupling cyclizations mediated by samarium diiodide, affording cyclic amino alcohols with controlled stereochemistry at the new aminated stereocenter. This approach has been successfully applied to the stereoselective synthesis of ...

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101

Control of Diastereoselectivity in C=O/C=N Reductive Cyclizations Using an Intramolecularly Tethered Hydrazone

Chiara, José Luis; García, Ángela

Cyclic hydrazones are efficient ketyl radical acceptors in reductive coupling cyclizations mediated by samarium diiodide, affording cyclic amino alcohols with controlled stereochemistry at the new aminated stereocenter. This approach has been successfully applied to the stereoselective synthesis of ...

DRIVER (Spanish)

103

Compounds with a 'stuffed' anti-bixbyite-type structure, analysed in terms of the Zintl-Klemm and coordination-defect concepts

Vegas, Ángel; Martin, Raymond L.; Bevan, D. J. M.

12 pages, 9 figures. | The bixbyite structure (Mn2O3)(Ia3) is often described as a distorted face-centered cubic (f.c.c.) array of Mn atoms, with O atoms occupying 3/4 of the tetrahedral holes. The empty M4 tetrahedra are centred at 16c. In anti-bixbyite structures (Mg3N2), cation vacancies are cent...

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108

Communications: a model study on the electronic predissociation of the NeBr2 van der Waals complex

Sanz-Sanz, Cristina; Roncero, Octavio; Hernández-Lamoneda, Ramón; M. Pio, Jordan; A. Taylor, Molly; C. Janda, Kenneth
2010-06-10

Digital.CSIC (Spain)

109

Collisional and photoinitiated reaction dynamics in the ground electronic state of Ca–HCl

Sanz, Cristina; Avoird, Ad van der; Roncero, Octavio

11 pages, 14 figures, 1 table.-- PACS nrs.: 82.30.Cf; 82.50.-m; 82.20.Kh; 82.30.Fi; 82.20.Rp; 82.20.Fd; 33.20.Ea; 33.15.Ry; 33.15.Dj; 82.30.Hk. | Ca+HCl(ν,j) reactive collisions were studied for different rovibrational states of the HCl reactant using wave-packet calculations in reactant Jacobi coor...

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111

Collective rotational transverse current multipoles: even-even nuclei

Berdichevsky, D.; Sarriguren, Pedro; Moya de Guerra, Elvira; Nishimura, M.; Sprung, D.W.L.
1988-07-01

Digital.CSIC (Spain)

113

Changes in photosynthetic electron transfer and state transitions in an herbicide-resistant D1 mutant from soybean cell cultures

Roncel Gil, Mercedes; Yruela Guerrero, Inmaculada; Kirilovsky, D.; Guerrero, Fernando; Alfonso Lozano, Miguel

The definitive version is available at: http://www.sciencedirect.com/science//journal/00052728 | Anomalies in photosynthetic activity of the soybean cell line STR7, carrying a single mutation (S268P) in the chloroplastic gene psbA that codes for the D1 protein of the photosystem II, have been examin...

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114

Changes in photosynthetic electron transfer and state transitions in an herbicide-resistant D1 mutant from soybean cell cultures

Roncel Gil, Mercedes; Yruela Guerrero, Inmaculada; Kirilovsky, D.; Guerrero, Fernando; Alfonso Lozano, Miguel; Picorel Castaño, Rafael; Ortega Rodríguez, Jose María
2007-06-01

Digital.CSIC (Spain)

115

Bayesian model of Snellen visual acuity

Nestares García, Óscar; Navarro, Rafael; Antona, Beatriz
2003-07-01

Digital.CSIC (Spain)

116

Anabaena sp. PCC 7119 flavodoxin as electron carrier from photosystem I to ferredoxin-NADP+ reductase. Role of Trp(57) and Tyr(94)

Casaus, José L.; Navarro Carruesco, José Antonio; Hervás, Manuel; Lostao, Anabel; Rosa, Miguel A. de la; Gómez-Moreno, Carlos; Sancho, Javier; Medina, Milagros
2002-04-11

Digital.CSIC (Spain)

117

Anabaena flavodoxin as an electron carrier from photosystem I to ferredoxin-NADP+ reductase. Role of flavodoxin residues in protein-protein interaction and electron transfer

Nogués, Isabel; Hervás, Manuel; Peregrina, José R.; Navarro, José A.; Rosa, Miguel A. de la; Gómez-Moreno, Carlos

10 pages, 4 figures, 6 tables.-- PMID: 15628849 [PubMed].-- Available online on Dec 4, 2004. | Biochemical and structural studies indicate that electrostatic and hydrophobic interactions are critical in the formation of optimal complexes for efficient electron transfer (ET) between ferredoxin-NADP+ ...

DRIVER (Spanish)

118

Anabaena flavodoxin as an electron carrier from photosystem I to ferredoxin-NADP+ reductase. Role of flavodoxin residues in protein-protein interaction and electron transfer

Nogués, Isabel; Hervás, Manuel; Peregrina, José R.; Navarro Carruesco, José Antonio; Rosa, Miguel A. de la; Gómez-Moreno, Carlos; Medina, Milagros
2005-01-11

Digital.CSIC (Spain)

119

An evolutionary analysis of the reaction mechanisms of photosystem I reduction by cytochrome c(6) and plastocyanin

Rosa, Miguel A. de la; Navarro, José A.; Díaz-Quintana, Antonio; Cerda, Berta de la; Molina-Heredia, Fernando P.

5 pages, 4 figures.-- PMID: 11786337 [PubMed].-- Available online Nov 29, 2001. | Photosystem I reduction by the soluble metalloproteins cytochrome c6 and plastocyanin, which are alternatively synthesized by some photosynthetic organisms depending on the relative availability of copper and iron, has...

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120

An evolutionary analysis of the reaction mechanisms of photosystem I reduction by cytochrome c(6) and plastocyanin

Rosa, Miguel A. de la; Navarro Carruesco, José Antonio; Díaz-Quintana, Antonio; Cerda, Berta de la; Molina-Heredia, Fernando P.; Balme, Alexis; Murdoch, Piedad del S.; Díaz-Moreno, Irene; Durán, Raúl V.; Hervás, Manuel
2002-01-01

Digital.CSIC (Spain)

121

Alterations in Photosystem II electron transport as revealed by thermoluminescence of Cu-poisoned chloroplasts

Horváth, Gábor; Arellano, Juan B.; Droppa, Magdolna; Barón, Matilde

7 pages, 6 figures. | The thermoluminescence characteristics of functionally intact thylakoids and TRIS-washed BBY particles were studied under Cu(II) poisoned conditions. In thylakoids, both the A and B thermoluminescence bands corresponding to S3QA- and S2S3QB- charge recombinations, respectively ...

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122

Alterations in Photosystem II electron transport as revealed by thermoluminescence of Cu-poisoned chloroplasts

Horváth, Gábor; Arellano, Juan B.; Droppa, Magdolna; Barón Ayala, Matilde
1998-08-01

Digital.CSIC (Spain)

123

Accommodation-dependent model of the human eye with aspherics

Navarro, Rafael; Santamaría, Javier; Bescós, J.
1985-08-01

Digital.CSIC (Spain)

124

ACRATA: a novel electron transfer domain associated to apoptosis and cancer

Sánchez-Pulido, Luis; Rojas, Ana Mª.; Valencia, Alfonso; Martínez-Alonso, Carlos; Andrade, Miguel A.

This article is available from: http://www.biomedcentral.com/1471-2407/4/98 | [Background] Recently, several members of a vertebrate protein family containing a six trans-membrane (6TM) domain and involved in apoptosis and cancer (e.g. STEAP, STAMP1, TSAP6), have been identified in Golgi and cytopla...

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125

ACRATA: a novel electron transfer domain associated to apoptosis and cancer

Sánchez-Pulido, Luis; Rojas, Ana Mª.; Valencia, Alfonso; Martínez-Alonso, Carlos; Andrade, Miguel A.
2004-12-19

Digital.CSIC (Spain)

127
128

A new cascade ΣΔ modulator for low-voltage wideband applications

Morgado, Alonso; Río Fernández, Rocío del; Rosa Utrera, José Manuel de la
2007-08-01

Digital.CSIC (Spain)

129

2s(1/2) occupancies in Si-30, P-31, and S-32

Wesseling, J.; de Jager, C.W.; Lapikas, L.; de Vries, H.; Fagg, L.W.; Harakeh, M.N.; Kalantar, N.; Lindgren, R.A.; Moya de Guerra, Elvira; Sarriguren, Pedro
1997-06-01

Digital.CSIC (Spain)