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337 results on '"Herrera-Estrella L"'

5. Insights into bear evolution from a Pleistocene polar bear genome

Author

Lan, T. (Tianying), Leppälä, K. (Kalle), Tomlin, C. (Crystal), Talbot, S. L. (Sandra L.), Sage, G. K. (George K.), Farley, S. D. (Sean D.), Shideler, R. T. (Richard T.), Bachmann, L. (Lutz), Wiig, Ø. (Øystein), Albert, V. A. (Victor A.), Salojärvi, J. (Jarkko), Mailund, T. (Thomas), Drautz-Moses, D. I. (Daniela I.), Schuster, S. C. (Stephan C.), Herrera-Estrella, L. (Luis), Lindqvist, C. (Charlotte), Lan, T. (Tianying), Leppälä, K. (Kalle), Tomlin, C. (Crystal), Talbot, S. L. (Sandra L.), Sage, G. K. (George K.), Farley, S. D. (Sean D.), Shideler, R. T. (Richard T.), Bachmann, L. (Lutz), Wiig, Ø. (Øystein), Albert, V. A. (Victor A.), Salojärvi, J. (Jarkko), Mailund, T. (Thomas), Drautz-Moses, D. I. (Daniela I.), Schuster, S. C. (Stephan C.), Herrera-Estrella, L. (Luis), and Lindqvist, C. (Charlotte)

Abstract

The polar bear (Ursus maritimus) has become a symbol of the threat to biodiversity from climate change. Understanding polar bear evolutionary history may provide insights into apex carnivore responses and prospects during periods of extreme environmental perturbations. In recent years, genomic studies have examined bear speciation and population history, including evidence for ancient admixture between polar bears and brown bears (Ursus arctos). Here, we extend our earlier studies of a 130,000- to 115,000-y-old polar bear from the Svalbard Archipelago using a 10× coverage genome sequence and 10 new genomes of polar and brown bears from contemporary zones of overlap in northern Alaska. We demonstrate a dramatic decline in effective population size for this ancient polar bear’s lineage, followed by a modest increase just before its demise. A slightly higher genetic diversity in the ancient polar bear suggests a severe genetic erosion over a prolonged bottleneck in modern polar bears. Statistical fitting of data to alternative admixture graph scenarios favors at least one ancient introgression event from brown bears into the ancestor of polar bears, possibly dating back over 150,000 y. Gene flow was likely bidirectional, but allelic transfer from brown into polar bear is the strongest detected signal, which contrasts with other published work. These findings may have implications for our understanding of climate change impacts: Polar bears, a specialist Arctic lineage, may not only have undergone severe genetic bottlenecks but also been the recipient of generalist, boreal genetic variants from brown bears during critical phases of Northern Hemisphere glacial oscillations.

Published
2022

9. Gene cloning and identification

Author

Xoconostle-Cázares, B., Lozoya-Gloria, E., Herrera-Estrella, L., Caligari, P. D. S., editor, Hayward, M. D., editor, Bosemark, N. O., editor, Romagosa, I., editor, and Cerezo, M., editor

Published
1993
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12. Biotechnology.

Author

Pliego-Alfaro, F., primary, Barceló-Muñoz, A., additional, López-Gómez, R., additional, Ibarra-Laclette, E., additional, Herrera-Estrella, L., additional, Palomo-Ríos, E., additional, Mercado, J. A., additional, and Litz, R. E., additional

Published
2013
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16. Molecular characterization of the effects of phosphorus on the development of root hairs in Arabidopsis

Author

Herrera-Estrella, L., Lopez-Bucio, J., Grierson, C., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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17. Effect of citrate overproduction on iron nutrition in plants

Author

Ramírez-Rodríguez, V., Nieto-Jacobo, M. F., López-Bucio, J., Herrera-Estrella, L., Horst, W. J., editor, Schenk, M. K., editor, Bürkert, A., editor, Claassen, N., editor, Flessa, H., editor, Frommer, W. B., editor, Goldbach, H., editor, Olfs, H. -W., editor, Römheld, V., editor, Sattelmacher, B., editor, Schmidhalter, U., editor, Schubert, S., editor, v. Wirén, N., editor, and Wittenmayer, L., editor

Published
2001
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29. Genetic Engineering of Plants

Author

Schell, J., Herrera-Estrella, L., Zambryski, P., De Block, M., Joos, H., Willmitzer, L., Eckes, P., Rosahl, S., Van Montagu, M., Schell, Jozef Stephaan, editor, and Starlinger, Peter, editor

Published
1984
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32. miRNAs analysis during prickly pear development

Author

Cruz-Hernández, A., primary, Escobar-Feregrino, T., additional, Guevara-González, R.G., additional, Torres-Pacheco, I., additional, Caballero-Pérez, J., additional, Cruz-Ramírez, A., additional, Herrera-Estrella, L., additional, and Arteaga-Vázquez, M., additional

Published
2016
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33. Chemical composition and antibacterial activity of essential oils extracted from plants cultivated in mexico

Author

Flores, C. R., Pennec, A., Nugier-Chauvin, C., Richard Daniellou, Herrera-Estrella, L., Chauvin, A. -L, Langebio (CINVESTAV), Université européenne de Bretagne - European University of Brittany (UEB), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), and Jonchère, Laurent

Subjects
[CHIM] Chemical Sciences, [CHIM]Chemical Sciences
Abstract

International audience; Samples of lavender, rosemary and laurel essential oils obtained from plants cultivated in Mexico were analyzed by GC-MS using a non polar capillary column. Characterization of individual components was performed using a com. mass spectrometry library, and 53 components were identified. The anal. of bioactive compds. highlighted a 5 and 2-fold increased quantity of potent antibacterial 1,8-cineole (46.5%) and camphor (12.3%) in lavandin "provence", compared to the French cultivars. It also showed a 3- and 2-fold increase in camphor and linalool concn. in rosemary and laurel compared to the av. level, making them promising alternatives for medicinal treatment. Strains of Gram-pos. and Gram-neg. bacteria were analyzed for their susceptibility to these essential oils using the agar disk diffusion method and their antimicrobial activity was demonstrated. To our knowledge, this is the first report on antibacterial activity of lavender essential oil, recently added to the Mexican pharmacopeia, against Mycobacterium smegmatis (Mc Rv 3782 PW2).

Published
2014

40. Maize for sustainable cropping systems on tropical acid soils - from molecular biology to field cultivation : First annual report covering the period from 1.11.2000 to 31.10.2001

Author

Horst, Walter (ed.), Calba, Henri (ed.), Barceló, Juan Antonio (ed.), Rojas, Leyla Amparo (ed.), Schaffert, Robert E. (ed.), Thé, Charles (ed.), Welcker, Claude (ed.), Puigdomenech, Pere (ed.), Herrera-Estrella, L. (ed.), and Menossi Teixera, M. (ed.)

Subjects
pH du sol, Phosphate, F61 - Physiologie végétale : nutrition, Zea mays, F30 - Génétique et amélioration des plantes, Projet de recherche, Physiologie de la nutrition, Résistance aux facteurs nuisibles, Aluminium, Marqueur génétique, Durabilité, Amendement du sol, Toxicité du sol, P35 - Fertilité du sol, Sol acide, Amélioration des plantes, Système de culture, Racine
Published
2001

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