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    Production and quality of conidia by Metarhizium anisopliae var. lepidiotum : critical oxygen level and period of mycelium competence

    Garcia-Ortiz, Nohemi, Tlecuitl-Beristain, Saúl, Favela-Torres, Ernesto, Loera, Octavio
    Applied Microbiology and Biotechnology, 2015, Vol.99(6), pp.2783-2791 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Production and quality of conidia by Metarhizium anisopliae var. lepidiotum : critical oxygen level and period of mycelium competence
    Author: Garcia-Ortiz, Nohemi; Tlecuitl-Beristain, Saúl; Favela-Torres, Ernesto; Loera, Octavio
    Subject: Mycoinsecticide ; Mass production ; Oxygen ; Conidial quality ; Virulence
    Description: Mycoinsecticides application within Integral Pest Management requires high quantities of conidia, with the proper quality and resistance against environmental conditions. Metarhizium anisopliae var. lepidiotum conidia were produced in normal atmospheric conditions (21 % O 2 ) and different concentrations of oxygen pulses (16, 26, 30, and 40 %); conidia obtained under hypoxic conditions showed significantly lower viability, hydrophobicity, and virulence against Tenebrio molitor larvae or mealworm, compared with those obtained under normal atmospheric conditions. Higher concentrations of oxygen (26 and 30 %) improved conidial production. However, when a 30 % oxygen concentration was applied, maximal conidial yields were obtained at earlier times (132 h) relative to 26 % oxygen pulses (156 h); additionally, with 30 % oxygen pulses, conidia thermotolerance was improved, maintaining viability, hydrophobicity, and virulence. Although conidial production was not affected when 40 % oxygen pulses were applied, viability and virulence were diminished in those conidia. In order to find a critical time for mycelia competence to respond to these oxidant conditions, oxygen pulses were first applied either at 36, 48, 60, and 72 h. A critical time of 60 h was determined to be the best time for the M. anisopliae var. lepidiotum mycelia to respond to oxygen pulses in order to increase conidial production and also to maintain the quality features. Therefore, oxygen-enriched (30 %) pulses starting at 60 h are recommended for a high production without the impairment of quality of M. anisopliae var. lepidiotum conidia.
    Is part of: Applied Microbiology and Biotechnology, 2015, Vol.99(6), pp.2783-2791
    Identifier: 0175-7598 (ISSN); 1432-0614 (E-ISSN); 10.1007/s00253-014-6225-2 (DOI)

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    Lead bioaccumulation in Acacia farnesiana and its effect on lipid peroxidation and glutathione production

    Maldonado-Magaña, Amalia, Favela-Torres, Ernesto, Rivera-Cabrera, Fernando, Volke-Sepulveda, Tania
    Plant and Soil, 2011, Vol.339(1), pp.377-389 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Lead bioaccumulation in Acacia farnesiana and its effect on lipid peroxidation and glutathione production
    Author: Maldonado-Magaña, Amalia; Favela-Torres, Ernesto; Rivera-Cabrera, Fernando; Volke-Sepulveda, Tania
    Subject: Acacia farnesiana ; Lead phytoremediation ; Glutathione ; Lipid peroxidation ; Oxidative stress
    Description: Phytoremediation offers a cheap, efficient and environmentally friendly option for cleaning sites contaminated with toxic elements. However, there is a need to find new plant species for phytoremediation and to understand the mechanisms involved in processes such as tolerance, accumulation, exclusion and metabolism of toxic metals in plants. Thereby, in this study, the ability of Acacia farnesiana (L.) Willd to tolerate and accumulate lead was analyzed. Seedlings grown in vitro with 250 and 500 mg Pb 2+ L −1 showed an increase in their growth, achieving tolerance indexes close to 100%. In seedlings exposed to 1,000 mg Pb 2+ L −1 , growth was strongly inhibited, finding an effective concentration 50% (EC 50 ) from 720 to 766 mg Pb 2+ L −1 . A. farnesiana accumulated ≥80% of the Pb 2+ in roots (up to 51,928 mg kg −1 of air-dried tissue) in seedlings exposed to 1,000 mg Pb 2+ L −1 , with high bioconcentration (>8.5) and low translocation (≤0.03) factors. These results indicate the suitability of A. farnesiana for lead-phytostabilization purposes. Lead concentrations below 500 mg L −1 had no significant effect on lipid peroxidation and enhanced the glutathione content, suggesting that the ability of A. farnesiana to withstand the Pb-induced oxidative stress could be related to glutathione metabolism.
    Is part of: Plant and Soil, 2011, Vol.339(1), pp.377-389
    Identifier: 0032-079X (ISSN); 1573-5036 (E-ISSN); 10.1007/s11104-010-0589-6 (DOI)

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    Efecto de Trichoderma harzianum Rifai (cepa A-34) y sus filtrados de cultivo en el control de tres hongos fitopatógenos foliares en arroz

    Pérez Torres, Ernesto Juniors
    Revista de Protección Vegetal, 01 August 2016, pp.150-150 [Peer Reviewed Journal]
    SciELO, SciELO Cuba, SciELO Complete
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    Title: Efecto de Trichoderma harzianum Rifai (cepa A-34) y sus filtrados de cultivo en el control de tres hongos fitopatógenos foliares en arroz
    Author: Pérez Torres, Ernesto Juniors
    Subject: Acoustics ; Agriculture
    Is part of: Revista de Protección Vegetal, 01 August 2016, pp.150-150
    Identifier: 2224-4697 (ISSN); 2224-4697 (E-ISSN)

    • Several versions

    Effect of Mixing on the Solid-State Fermentation of Coffee Pulp with Aspergillus tamarii

    Nava, Isaias, Favela-Torres, Ernesto, Saucedo-Castañeda, Gerardo
    Food Technology and Biotechnology, 2011, Vol.49(3), pp.391-395 [Peer Reviewed Journal]

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    Production and quality of conidia by Metarhizium anisopliae var. lepidiotum: critical oxygen level and period of mycelium competence

    Garcia-Ortiz, Nohemi, Tlecuitl-Beristain, Saúl, Favela-Torres, Ernesto, Loera, Octavio
    Applied microbiology and biotechnology, March 2015, Vol.99(6), pp.2783-91 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Production and quality of conidia by Metarhizium anisopliae var. lepidiotum: critical oxygen level and period of mycelium competence
    Author: Garcia-Ortiz, Nohemi; Tlecuitl-Beristain, Saúl; Favela-Torres, Ernesto; Loera, Octavio
    Subject: Metarhizium -- Growth & Development ; Mycelium -- Metabolism ; Oxygen -- Metabolism ; Spores, Fungal -- Growth & Development
    Description: Mycoinsecticides application within Integral Pest Management requires high quantities of conidia, with the proper quality and resistance against environmental conditions. Metarhizium anisopliae var. lepidiotum conidia were produced in normal atmospheric conditions (21 % O2) and different concentrations of oxygen pulses (16, 26, 30, and 40 %); conidia obtained under hypoxic conditions showed significantly lower viability, hydrophobicity, and virulence against Tenebrio molitor larvae or mealworm, compared with those obtained under normal atmospheric conditions. Higher concentrations of oxygen (26 and 30 %) improved conidial production. However, when a 30 % oxygen concentration was applied, maximal conidial yields were obtained at earlier times (132 h) relative to 26 % oxygen pulses (156 h); additionally, with 30 % oxygen pulses, conidia thermotolerance was improved, maintaining viability, hydrophobicity, and virulence. Although conidial production was not affected when 40 % oxygen pulses...
    Is part of: Applied microbiology and biotechnology, March 2015, Vol.99(6), pp.2783-91
    Identifier: 1432-0614 (E-ISSN); 25472433 Version (PMID); 10.1007/s00253-014-6225-2 (DOI)

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    Role of glutathione and glutathione S-transferase in lead tolerance and bioaccumulation by Dodonaea viscosa (L.) Jacq

    Rojas-Loria, César, Favela-Torres, Ernesto, González-Márquez, Humberto, Volke-Sepúlveda, Tania
    Acta Physiologiae Plantarum, 2014, Vol.36(9), pp.2501-2510 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Role of glutathione and glutathione S-transferase in lead tolerance and bioaccumulation by Dodonaea viscosa (L.) Jacq
    Author: Rojas-Loria, César; Favela-Torres, Ernesto; González-Márquez, Humberto; Volke-Sepúlveda, Tania
    Subject: Dodonaea viscosa ; Glutathione ; Glutathione S-transferase ; Phytostabilization ; Lead tolerance
    Description: Glutathione (GSH) plays a central role in the plant tolerance against the toxic effects of metals. It is a key antioxidant and acts as a cofactor for glutathione S-transferase (GST). The main objective of this study was to determine the Pb tolerance and bioaccumulation by Dodonaea viscosa (L.) Jacq. and their relation to GSH production and GST activity. The relationship between the Pb tolerance and bioaccumulation by D. viscosa and the effect of the exposure time on the GSH production or the GST activity was assessed in trials with perlite under different Pb treatments. D. viscosa showed a remarkable tolerance to Pb [half-inhibitory concentration (IC 50 ) = 2,797 mg kg −1 ] and accumulated up to 11,428 mg Pb kg −1 in dry roots with a limited translocation to shoots without any signs of phytotoxicity after 105 days of exposure. The stress caused by the fast Pb uptake rate (489 mg kg −1 day −1 ) during the first 10 days of exposure was strongly correlated to increased GSH contents (~1.3-fold) and GST activities (~3.6-fold) in both shoots and roots. The results indicate that the Pb stress triggered a defense mechanism that involved increased contents of GSH and GST activities, suggesting that both variables are involved in the tolerance of D. viscosa against Pb toxicity.
    Is part of: Acta Physiologiae Plantarum, 2014, Vol.36(9), pp.2501-2510
    Identifier: 0137-5881 (ISSN); 1861-1664 (E-ISSN); 10.1007/s11738-014-1623-8 (DOI)

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    Jasmonic acid biosynthesis by microorganisms: Derivatives, first evidences on biochemical pathways and culture conditions for production

    Eng, Felipe, Zienkiewicz, Krzysztof, Gutiérrez-Rojas, Mariano, Favela-Torres, Ernesto, Feussner, Ivo
    PeerJ PrePrints, Mar 10, 2018
    © ProQuest LLC All rights reserved, ProQuest Science Journals, Science Database (Alumni edition), Biological Science Database, Publicly Available Content Database, ProQuest Biological Science Collection, ProQuest Central, ProQuest Natural Science Collection, ProQuest SciTech Collection, Natural Science Collection, ProQuest Central (new), ProQuest Central K-12, ProQuest Central Korea, SciTech Premium Collection, ProQuest Central Essentials, ProQuest Central China, ProQuest One Academic
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    Title: Jasmonic acid biosynthesis by microorganisms: Derivatives, first evidences on biochemical pathways and culture conditions for production
    Author: Eng, Felipe; Zienkiewicz, Krzysztof; Gutiérrez-Rojas, Mariano; Favela-Torres, Ernesto; Feussner, Ivo
    Subject: Plant Protection ; Fungi ; Jasmonic Acid ; Microorganisms ; Biosynthesis ; Cancer ; Cell Culture ; Flavor ; Microorganisms ; Signal Transduction ; Metabolites ; Culture Media ; Oxylipin ; Fungi ; Submerged Fermentation ; Jasmonic Acid ; Culture Medium ; Metabolic Pathway
    Description: Jasmonic acid (JA) and its derivatives (called jasmonates) are lipid-derived signalling molecules that are produced by certain bacteria, fungi and plants. Beside this function, jasmonates have a great variety of applications in the flavour and fragrances production. In addition, they may have a high potential in agriculture. JAs protect plant against infections and may suppress the growth of cancer cells in humans and animals. Although a lot of information on the biosynthesis and function of JA exists from plants, knowledge on these aspects is still scarce for microorganisms. Taking into account the practical importance of JA, the objective of this review is to summarize knowledge on the occurrence of jasmonates from microbial culture media, their biosynthetic pathways and the culture conditions for optimal JA production as an alternative source for the production of these valuable metabolites
    Is part of: PeerJ PrePrints, Mar 10, 2018
    Identifier: 21679843 (E-ISSN); 10.7287/peerj.preprints.26655v1 (DOI)

    • Several versions

    Enzymatic Extraction of Hydroxycinnamic Acids from Coffee Pulp

    Torres-Mancera, María, Cordova-López, Jesús, Rodríguez-Serrano, Gabriela, Roussos, Sevastianos, Ramírez-Coronel, Ma, Favela-Torres, Ernesto, Saucedo-Castañeda, Gerardo
    Food Technology and Biotechnology, 2011, Vol.49(3), pp.369-373 [Peer Reviewed Journal]

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    Soluble and bound hydroxycinnamates in coffee pulp (Coffea arabica) from seven cultivars at three ripening stages

    Rodríguez-Durán, Luis V, Ramírez-Coronel, Ma Ascención, Aranda-Delgado, Eduardo, Nampoothiri, K Madhavan, Favela-Torres, Ernesto, Aguilar, Cristóbal N, Saucedo-Castañeda, Gerardo
    Journal of agricultural and food chemistry, 06 August 2014, Vol.62(31), pp.7869-76 [Peer Reviewed Journal]
    MEDLINE/PubMed (U.S. National Library of Medicine)
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    Title: Soluble and bound hydroxycinnamates in coffee pulp (Coffea arabica) from seven cultivars at three ripening stages
    Author: Rodríguez-Durán, Luis V; Ramírez-Coronel, Ma Ascención; Aranda-Delgado, Eduardo; Nampoothiri, K Madhavan; Favela-Torres, Ernesto; Aguilar, Cristóbal N; Saucedo-Castañeda, Gerardo
    Subject: Coffea -- Chemistry ; Coumaric Acids -- Analysis ; Seeds -- Chemistry
    Description: The contents of soluble and bound hydroxycinnamates (HCAs) were analyzed in coffee pulp (CP) of seven cultivars of Coffea arabica at three different ripening stages. Methodologies for the extraction and analysis of HCAs were evaluated and improved. HCAs were present mainly in the soluble fraction (68-97%). Chlorogenic acid was the main phenolic acid (94-98%) in the soluble fraction, whereas caffeic acid was the most abundant HCA found in the bound fraction (72-88%). Small amounts of free and bound ferulic and p-coumaric acids were also detected. The content of total HCAs in CP reached the maximum concentration at the semiripe stage (7.4-25.5 mg/g CP, dw) but decreased at the ripe stage for six of the seven cultivars. These findings suggest that unripe or semiripe coffee cherries, considered as defective cherries, are a potential inexpensive source of phenolic compounds, such as chlorogenic and caffeic acids.
    Is part of: Journal of agricultural and food chemistry, 06 August 2014, Vol.62(31), pp.7869-76
    Identifier: 1520-5118 (E-ISSN); 25008987 Version (PMID); 10.1021/jf5014956 (DOI)

    • Several versions

    Production of Thermostable Lipase by Thermomyces lanuginosus on Solid-State Fermentation: Selective Hydrolysis of Sardine Oil

    Ávila-Cisneros, Nayeli, Velasco-Lozano, Susana, Huerta-Ochoa, Sergio, Córdova-López, Jesús, Gimeno, Miquel, Favela-Torres, Ernesto
    Applied Biochemistry and Biotechnology, 2014, Vol.174(5), pp.1859-1872 [Peer Reviewed Journal]