The "Environmental Microbiology" group strives to excel in the research of its graduate students and on "tailor-made" theses. Each of our students is required to publish his/her thesis or main findings in high impact, peer-reviewed scientific journals. "Instant" and "assembly line" theses are therefore, unavailable.

Graduated students (From present to 1992)

edgar 2018 Name: Edgar Amavizca
Degree: Ph.D.
Years: 2018-
Graduate school: The Center for Biological Research of the Northwest. La Paz, Mexico.
Thesis: Synthetic mutualism: Relevance of bacteria-microalgae adhesion and importance of Chlorella sorokiniana phycosfere in Azospirillum brasilense metabolism
Name: Cristina Galaviz
Degree: Ph.D.
Years: 2017-Present
Graduate school: The Center for Biological Research of the Northwest. La Paz, Mexico.
Thesis: Abiotic and biotic factors related to the proliferation of Vibrio spp., cause of AHPND in white shrimp Litopenaeus vannamei Boone.
cris 2018
Name: Alejandro Figueroa-Lopez
Degree: Ph.D.
Years: 2013-2017
Graduate school: CIIDIR-IPN, Guasave, Sinaloa, Mexico
Thesis: Evaluation of Bacillus cereus chitinases to control Fusarium verticillioides in maize
Name: Oskar Palacios Lopez
Degree: Ph.D.
Years: 2011-2015
Graduate school: The Center for Biological Research of the Northwest. La Paz, Mexico.
Thesis: Study of microalgae-bacteria interaction on thiamine and tryptophan production by Chlorella sorokiniana and their effect on IAA biosynthesis by Azospirillum brasilense.
oskar palacios

Oskar is preparing his experiments on
the effect of vitamins on A. brasilense
Publication from thesis:
  1. Palacios, O.A., Gomez-Anduro, G., Bashan, Y., and de-Bashan, L.E. 2016. Tryptophan, thiamine and indole-3-acetic acid exchange between Chlorella sorokiniana and the plant growth-promoting bacterium Azospirillum brasilense. FEMS Microbiology Ecology. 92: fiw077. doi: 10.1093/femsec/fiw077.

  2. Palacios, O.A., Choix, F.J., Bashan, Y, de-Bashan, L.E. 2016. Influence of tryptophan ans indole-3-acetic acid on starch accumulation in the synthetic mutualistic Chlorella sorokinianaAzospirillum brasilense system under heterotrophic conditions. Research in Microbiology. 167:367-379.

  3. Palacios, O.A., Bashan, Y., and de-Bashan, L.E. 2014. Proven and potential involvement of vitamins in interactions of plants with plant growth-promoting bacteria—an overview. Biology and Fertility of Soils 50: 415-432

  4. Palacios, O. A., Bashan, Y., Schmid, M., Hartmann, A., de-Bashan, L. E. 2016. Enhancement of thiamine release during synthetic mutualism between Chlorella sorokiniana and Azospirillum brasilense growing under stress conditions. Journal of Applied Phycology. 28:1521–1531.

Luis Leyva AcetylCoA

I'm sitting here in a boring room. It is just another afternoon of work. I'm wasting my time. I got nothing to do and all that I can see is just another Acetyl CoA-carboxilase reaction.

Name: Luis Alonso Leyva
Degree: Ph.D.
Years: 2009-2014
Graduate school: The Center for Biological Research of the Northwest. La Paz, Mexico.
Thesis: Accumulation of lipids and fatty acids in the microalgae Chlorella vulgaris co-immobilized in alginate beads with Azospirillum brasilense in relation to cultivation conditions.
Publications from thesis:
  1. Leyva, L.A., Bashan Y., Mendoza, A., and de-Bashan, L.E. 2014. Accumulation of fatty acids in Chlorella vulgaris under heterotrophic conditions in relation to activity of acetyl-CoA carboxylase, temperature, and co-immobilization with Azospirillum brasilense. Naturwissenschaften 101:819–830

  2. Leyva, L.A., Bashan Y., and de-Bashan, L.E. 2015. Activity of acetyl-CoA carboxylase is not directly linked to accumulation of lipids when Chlorella vulgaris is co-immobilised with Azospirillum brasilense in alginate under autotrophic and heterotrophic conditions. Annals of Microbiology 65: 339-349

francisco choix

Francisco Choix is measuring pH and accumulation of carbohydrates in the microalga Chlorella vulgaris coimmobilized with Azospirillum brasilense

Name: Francisco Javier Choix Ley
Degree: Ph.D.
Years: 2010-2014
Graduate school: The Center for Biological Research of the Northwest. La Paz, Mexico.
Thesis: Evaluation of accumulation of carbohydrates in the microalgae Chlorella spp. associated with the bacterium Azospirillum brasilense
Publications from thesis:
  1. Palacios, O.A., Choix, F.J., Bashan, Y, de-Bashan, L.E. 2016. Influence of tryptophan ans indole-3-acetic acid on starch accumulation in the synthetic mutualistic Chlorella sorokinianaAzospirillum brasilense system under heterotrophic conditions. Research in Microbiology. 167:367-379.

  2. Choix, F. J., de-Bashan, L.E. and Bashan, Y. 2012. Enhanced accumulation of starch and total carbohydrates in alginate-immobilized Chlorella spp. induced by Azospirillum brasilense: I. Autotrophic conditions. Enzyme and Microbial Technology 51: 294–299

  3. Choix, F. J., de-Bashan, L.E. and Bashan, Y. 2012. Enhanced accumulation of starch and total carbohydrates in alginate-immobilized Chlorella spp. induced by Azospirillum brasilense: II. Heterotrophic conditions. Enzyme and Microbial Technology 51: 300–309

  4. Choix, F.J., Bashan, Y., Mendoza, A., and de-Bashan, L.E. 2014. Enhanced activity of ADP glucose pyrophosphorylase and formation of starch induced by Azospirillum brasilense in Chlorella vulgaris. Journal of Biotechnology 177: 22-34

Name: Alejandra Vovides Tejeda
Degree: Ph.D.
Years: 2006-2011
Graduate school: Ecology Institute, Xalapa, Mexico.
Thesis: Nitrogen fixation in disturbed, reforested and conserved mangroves in arid and tropical zones of Mexico.
Alejandra Vovides

Alejandra Vovides is measuring salinity in the restored mangrove ecosystem at Balandra Lagoon, near the city of La Paz, Baja California Sur, Mexico.

Publications from thesis:
  1. Vovides, A. G., Bashan, Y., Lopez-Portillo, J. A. and Guevara, R. 2011 Nitrogen fixation in preserved, reforested, naturally regenerated and impaired mangroves as an indicator of functional restoration in mangroves in an arid region of Mexico. Restoration Ecology 19: 236–244
  2. Vovides, A.G., López-Portillo, J., and Bashan, Y. 2011. N2-fixation along a gradient of long-term disturbance in tropical mangroves bordering the gulf of Mexico. Biology and Fertility of Soils 47: 567–576
Blanca, microalgas, bacterias

Blanca Romero, in front, Rocio Villalpando and Bernardo Salazar measuring Mamillaria cacti that degrad rocks.

Name: Blanca Estela Romero Lopez
Degree: D.Sc.
Years: 2004-2009
Graduate school: The Center for Biological Research of the Northwest, La Paz, Mexico
Thesis: Studies of rock colonization by Mammillaria fraileana and evaluation of its association with endophytic bacteria on plant growth and rock weathering.
Blanca

Blanca Romero, Yoav Bashan and Macariov Bacilio in field survey of rock degrading cacti.

Publications from thesis:
  1. Lopez, R.B., Bashan, Y., Bacilio M. and De la Cruz-Aguero, G. 2009 Rock-colonizing plants: abundance of the endemic cactus Mammillaria fraileana related to rock type in the southern Sonoran Desert. Plant Ecology 201: 575-588 The definitive version is available at: http://www.elsevier.com/plant ecology

  2. Lopez, B.R., Bashan, Y., and Bacilio, M., 2011. Endophytic bacteria of Mammillaria fraileana, an endemic rock-colonizing cactus of the Southern Sonoran Desert. Archives of Microbiology 193: 527-541
    The definitive version is available electronically on SpringerLink: http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s00203-011-0695-8

  3. Lopez, B.R., Tinoco-Ojanguren, C., Bacilio, M., Mendoza, A., and Bashan, Y., 2012. Endophytic bacteria of the rock-dwelling cactus Mammillaria fraileana affect plant growth and mobilization of elements from rocks. Environmental and Experimental Botany 81: 26-36

Name: Luz E. Gonzalez de-Bashan
Degree: Ph.D.
Years: 2001-2006
Graduate school: Laval University, Quebec, Canada.
Thesis: Ammonium metabolism coupled with indole-3-acetic acid in the microalgae Chlorella vulgaris when coimmobilized in alginate beads with the microalgae growth-promoting bacterium Azospirillum brasilense.
Luz Gonzalez de Bashan

Luz Gonzalez de Bashan preparing microalgae for water treatment.

Publications from thesis:
  1. de-Bashan, L.E. and Bashan, Y. 2004. Recent advances in removing phosphorus from wastewater and its future use as fertilizer (1997-2003). Water Research 38: 4222-4246

  2. de-Bashan, L.E., Antoun H., and Bashan, Y. 2005. Cultivation factors and population size control uptake of nitrogen by the microalgae Chlorella vulgaris when interacting with the microalgae growth-promoting baterium Azospirillum brasilense.FEMS Microbiology Ecology 54: 197-203

  3. de-Bashan, L.E., Antoun, H., and Bashan Y. 2008. Involvement of indole-3-acetic-acid produced by the growth-promoting bacterium Azospirillum spp. in promoting growth of Chlorella vulgaris. Journal of Phycology 44: 938–947.

  4. de-Bashan, L.E., Magallon, P., Antoun, H., and Bashan Y. 2008. Role of glutamate dehydrogenase and glutamine synthetase in Chlorella vulgaris during assimilation of ammonium when jointly immobilized with the microalgae-growth-promoting bacterium Azospirillum brasilense. Journal of Phycology 44 : 1188–1196.

  5. de-Bashan, L.E., and Bashan Y. 2008. Joint immobilization of plant growth-promoting bacteria and green microalgae in alginate beads as an experimental model for studying plant-bacterium interactions. Applied and Environmental Microbiology 74: 6797–6802.
alginato de sargassum

Alginate beads containing the Plant growth-promotign bacteria Azospirillum brasilense Cd. above beads from Macrocystis pyrifera below beads from Sargassum sinicola(Inoculant for agriculture)

Name: Ricardo Yabur Pacheco
Degree: D.Sc.
Years: 2001-2005
Graduate school: The Center for Biological Research of the Northwest, La Paz, Mexico
Thesis: Production and properties of alginate from Sargassum sinicola (Setchell & Gardner) and its application in immobilization of cell.
diferentes esferas de alginato

Different beads of alginate from various sources. (from left to rigth: control of Macrocystis pyrifera, control of Sargassum sinicola, immobilized of Macrocystis pyrifera (Chlorella), immobilized of Sargassum sinicola (Chlorella), co-immobilized of Macrocystis pyrifera(Chlorella with Azospirillum), co-immobilized of Sargassum sinicola (Chlorella with Azospirillum)

Publication from thesis:
  1. Yabur, R., Bashan Y., Hernández-Carmona G. 2007. Alginate from the macroalgae Sargassum sinicola as a novel source for microbial immobilization material in wastewater treatment and plant growth promotion. Journal of Applied Phycology 19: 43-53.
Cardon seedlins in rock

Is it possible that the giant cardon cactus will start its life in hole in a rock based on its endophytic bacteria? (after germination).

Name: Esther Puente
Degree: D.Sc.
Years: 1999-2004
Graduate school: The Center for Biological Research of the Northwest, La Paz, Mexico
Thesis: Endophytic and rhizoplane bacterial populations from desert plants that weather rocks and their effect on the growth of cardon cactus.
Cardon seedlins in rock

Is it possible that the giant cardon cactus will start its life in hole in a rock based on its endophytic bacteria? (6 months after)

Publications from thesis:
  1. Puente, M.E., Bashan, Y., Li, C.Y., and Lebsky, V.K. 2004. Microbial populations and activities in the rhizoplane of rock-weathering desert plants, I. Root colonization and weathering of igneous rocks. Plant Biology 6: 629-642

  2. Puente, M.E., Li, C.Y., and Bashan, Y. 2004. Microbial populations and activities in the rhizoplane of rock-weathering desert plants, II. Growth promotion of cactus seedling. Plant Biology 6: 643-650

  3. Puente, M.E., Rodriguez-Jaramillo, M.C., Li, C.Y. and Bashan, Y. 2006. Image analysis for quantification of bacterial rock weathering. Journal of Microbiological Methods 64: 275-286
  4. Puente, M.E., Li, C.Y. and Bashan, Y. 2009 Rock-degrading endophytic bacteria in cacti. Environmental and Experimental Botany 66: 389-401

  5. Puente, M.E., Li, C.Y. and Bashan, Y. 2009 Endophytic bacteria in cacti seeds can improve the development of cactus seedlings. Environmental and Experimental Botany 66: 402-408

Name: Thelma Castellanos
Degree: D.Sc.
Years: 1994-1997
Graduate school: The Center for Biological Research of the Northwest, La Paz, Mexico
Thesis: Responses of the cell surface of the plant growth-promoting bacteria Azospirillum spp. to external stimuli.
Publications from thesis:
  1. Castellanos, T., Ascencio, F. y Bashan, Y. 1997. Cell-surface hydrophobicity and cell-surface charge of Azospirillum spp. FEMS Microbiology Ecology 24: 159-172.

  2. Castellanos, T., Ascencio, F. y Bashan, Y. 1998. Cell-surface lectins of Azospirillum spp. Current Microbiology 36: 241-244.

  3. Castellanos, T., Ascencio, F. y Bashan, Y. 2000. Starvation-induced changes in the cell surface of Azospirillum lipoferum. FEMS Microbiology Ecology 33: 1-9.
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