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Native soil bacteria isolates in Mexico exhibit a promising antagonistic effect against Fusarium oxysporum f. sp. radicis-lycopersici

JESUS DAMIAN CORDERO RAMIREZ (2012)

Sinaloa state accounts for 23% of Mexico’s tomato production. One constraint on this important crop is the Fusarium crown and root rot, caused by Fusarium oxysporum f. sp. radicis-lycopersici, which has been reported to reduce crop yield by up to 50%. In this study, we set out to identify bacterial populations which could be used to control this disease through natural antagonism. Five tomato rhizospheric soil samples were collected, dried for 1-week, and homogenized. Sub-samples were used to prepare an aqueous solution used to isolate microorganisms in pure cultures. Organisms were purified and grown separately, and used to generate a collection of 705 bacterial isolates. Thirty-four percent from this bank (254 strains) was screened against Forl, finding 27 bacteria displaying in vitro Forl growth inhibition levels from 5% to 60%. These isolates belonged to the genus Bacillus and their 16Sr DNA sequences showed that they are closely related to seven species

and they were putatively designated as: B. subtilis, B. cereus, B. amyloliquefaciens, B. licheniformis,

B. thuringiensis, B. megaterium, and B. pumilus. One isolate belonged to the genus Acinetobacter. Two

B. subtilis isolates (144 and 151) and one B. cereus isolate (171) showed the best antagonistic potential

against FCRRT when evaluated on seedlings. Plate and activity assays indicate that these isolates

include a diverse repertoire of functional antagonistic traits that might explain their ability to control FCRRT. Moreover, bacteria showed partial hemolytic activity, and future research will be directed at ensuring that their application will be not harmful for humans and effective against Forl in greenhouse or field conditions.

Article

MEDICINA Y CIENCIAS DE LA SALUD Native bacteria Microorganism collection Bacterial antagonism Forl FCRRT

Bioanode of polyurethane graphite polypyrrole composite in microbial fuel cells

PEDRO PÉREZ RODRÍGUEZ VÍCTOR MANUEL OVANDO MEDINA SILVIA YUDITH MARTINEZ AMADOR JOSE ANTONIO RODRIGUEZ DE LA GARZA (2017)

"Polyurethane (PU) foams were coated with graphite, and pyrrole monomer was subsequently polymerized onto its surface by chemical oxidization to obtain nanostructured polyurethane/graphite/polypyrrole (PU/Graph/PPy) composites, which were used for anaerobic microorganisms grown and tested as anodes in microbial fuel cells (MFC) using municipal wastewater as fuel. The effects of oxidizing agent type (ammonium persulfate and FeClz) used in pyrrole polymerization on the performance of electrodes in MFC were studied. Composites were characterized by Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), and by the four-point probes to determine conductivity. It was observed from SEM analysis that globular nanostructures of PPy were formed onto PU surface with average diameters between 120 and 450 nm, which are typical of aqueous polymerization of pyrrole monomer. The highest output power density observed in MFCs was 305.5 mW/m3 for the composite synthesized using FeCl3 as the oxidant, and 128.6 mW/m3 using the composite obtained with ammonium persulfate as oxidizing; the corresponding chemical oxygen demand (COD) removal were 48.2 and 45.5%, respectively. The calculated coulombic efficiency for PU/Graph/PPy composite obtained with FeCl3 as oxidant was of 9.4%. Internal resistance of MFC using the composite obtained with FeCl3 as-oxidant was determined by linear sweep voltammetry (LSV) and the variable resistance (VR) methods, giving 4.8 and 2.9 KO), respectively, with average maximum power density of 237.5 mW/m3."

Article

Polyurethane Polypyrrole Graphite Microorganism Mfc CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Isolation and phylogenetic classification of culturable psychrophilic prokaryotes from the Collins glacier in the Antarctica

SERGIO ANGEL GARCIA ECHAURI MARTHA LETICIA SANTOS MARTINEZ ANTONIO DE LEON RODRIGUEZ (2011)

"Culturable psychrophilic prokaryotes were obtained of samples of glacier sediment, seaside mud, glacier melted ice, and Deschampsia antarctica rhizosphere from Collins glacier, Antarctica. The taxonomic classification was done by a culture-dependent molecular approach involving the Amplified Ribosomal DNA Restriction Analysis. Two hundred sixty colonies were successfully isolated and sub-cultivated under laboratory conditions. The analysis showed a bacterial profile dominated by Beta-proteobacteria (35.2%) followed by Gamma-proteobacteria (18.5%), Alpha-proteobacteria (16.6%), Gram-positive with high GC content (13%), Cytophaga–Flavobacterium–Bacteroides (13%) and Gram-positive with low GC content (3.7%). Eleven of the isolates have been reported previously and the others microorganisms remain uncharacterized. The isolated microorganisms here could be a potential source for biotechnological products, such as cold-active enzymes and secondary metabolites."

Article

Psychrophilic Bacterium Extremophilic Microorganism Psychrophilic Microorganism Proteobacteria Alpha Janthinobacterium Lividum BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA MICROBIOLOGÍA

Review of antibacterial activity of plant exctacts and growth-promoting microorganims (GPM) against phytopat hogenic bacterial tomato crop

ROBERTO ARREDONDO VALDES FRANCISCO DANIEL HERNÁNDEZ CASTILLO JULIA CECILIA ANGUIANO CABELLO YISA MARIA OCHOA FUENTES GABRIEL GALLEGOS MORALES DIANA JASSO CANTU CRISTÓBAL NOÉ AGUILAR GONZÁLEZ (2018)

"Tomato is the second vegetable more important crop in the world, but has problems with bacterial phytopathogen that causes economic losses. The effectiveness of bioalternatives for controlling phytopathogen bacterial tomato disease is importance nowadays. Scientists are working on the development of new techniques for bioalternatives to control bacterial tomato diseases trying to avoid the traditional chemical control, because side effects can affect human health and causes damage at environment. In this review summarizes the alternatives compounds of some extract plants, as well as some compounds by Bacillus used as plant-growth promoting rhizobacteria, and some compounds by Trichoderma like an plant-growth promoting fungi."

Article

Agrobiotechnology Plant-extracts Beneficial-microorganism, Tomato CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Reforma administrativa y gestión del servicio de recolección y disposición de desechos sólidos en Tlalnepantla

ROCIO MORALES LOPERENA (2001)

292 páginas. Maestría en Planeación y Políticas Metropolitanas.

La intención de este trabajo es hacer una reflexión acerca de las características que guarda la prestación de los servicios públicos en el Municipio de Tlalnepantla a partir del proceso de Reforma del Estado en México, y concretamente la Reforma Administrativa.

Master thesis

Refuse collection. TD794 INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS INGENIERÍA Y TECNOLOGÍA DEL MEDIO AMBIENTE ELIMINACIÓN DE RESIDUOS

Abastecimiento de agua potable para pequeñas comunidades rurales por medio de un sistema de colección de lluvia-planta potabilizadora

CARLOS DIAZ DELGADO DAURY GARCIA PULIDO CARLOS SOLIS MORELOS (2000)

In this paper is showed the design of a system of drinking water supply for small rural communities trough rainfall collection-treatment plant. The design of the developed treatment plant considers a consumption of 60 1/h/d. In this work the following characteristics have been retained as the representatives for a rural comunity: £ 200 inhabitants; lack of potable water and electrical energy; to count on the possibility of supplying themselves of surface water under specific topographical conditions that they diminish the requirements of energy in the purification process. The rainwater harvesting represents a frequent scene in Latin America, and the proposed process of purification considers devices of low cost and easily operation.

In this paper is showed the design of a system of drinking water supply for small rural communities trough rainfall collection-treatment plant. The design of the developed treatment plant considers a consumption of 60 1/h/d. In this work the following characteristics have been retained as the representatives for a rural comunity: ≤ 200 inhabitants; lack of potable water and electrical energy; to count on the possibility of supplying themselves of surface water under specific topographical conditions that they diminish the requirements of energy in the purification process. The rainwater harvesting represents a frequent scene in Latin America, and the proposed process of purification considers devices of low cost and easily operation.

Article

Multidisciplinarias (Ciencias Sociales) Drinking water supply Rural communities Treatment plant Rainfall collection State of Mexico CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA