Papers by Jaime Fernando Gomez Rodríguez
Limnetica, 2012
The Gulf Stream position influences the functional composition of phytoplankton in El Gergal rese... more The Gulf Stream position influences the functional composition of phytoplankton in El Gergal reservoir (Spain) The latitudinal position of the north-wall of the Gulf Stream influences the climatic conditions in the Atlantic North and Western Europe. Southerly movements of the Gulf Stream (low Gulf Stream Index values, GSI) typically induce unstable meteorological conditions in this region, while north displacements of the oceanic current (high GSI values) are associated with stable weather. In the present article we explore a seven years data set including annual GSI, meteorological records and phytoplankton community composition and abundance to demonstrate that the year-to-year changes in the position of the Gulf Stream and its influence on the prevailing weather conditions have an effect on the long-term variability of phytoplankton community in El Gergal reservoir, an ecosystem located in the Atlantic coast of Andalusia (SW Spain). Furthermore, we describe the response of each considered phytoplankton functional groups to changes in the Gulf Stream position. Thus, northerly displacements of the north-wall increased the abundance of H + S 1 cyanobacteria through a non-linear function with two marked GSI thresholds. GSI and L m dinoflagellates abundance depicted a significant positive linear correlation, while groups B + P diatoms abundance was negatively linear correlated with GSI. Groups Y cryptophytes and X 1 + J chlorophytes abundance remained nearly constant for most of the studied years but developed an exponential increase at high GSI years. Implications for water quality management are pointed out.
Características químicas y propiedades de superficie en secuencias-tipo de materiales esmectíticos en el yacimiento de sepiolita de Vicálvaro (Madrid)
Boletin De La Sociedad Espanola De Mineralogia, 1996
Heulandita asociada a esmectitas-Mg en el yacimiento de Sepiolita de Vicálvaro (Cuenca Neógena de Madrid)
Boletin De La Sociedad Espanola De Mineralogia, 1995
Problems in the quantitative analysis of submicron particles in marine waters
Scientia Marina, 1994
Estimating the density and pulping yield of Eucalyptus globulus wood by DRIFT-MIR spectroscopy and principal components regression (PCR)
Journal of the Chilean Chemical Society
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[Preliminary evaluation of maggot (Diptera: Calliphoridae) therapy as a potential treatment for leishmaniasis ulcers]
Biomédica : revista del Instituto Nacional de Salud, 2008
Maggot debridement therapy has been widely used for treating a variety of scarred-over soft-tissu... more Maggot debridement therapy has been widely used for treating a variety of scarred-over soft-tissue wounds. Published accounts record several illnesses in which treatment with larval therapy has promoted injury healing in conjunction with infection by bacterial pathogens resistant to conventional antibiotics. An initial test of the maggot therapy was developed for cutaneous injuries produced by Leishmania amazonensis. An experimental design based on an animal model with three replicates in Mesocricetus aureatus (Rodentia: Muridae) was used to evaluate size variation lesion before and after after larval therapy with Lucilia sericata maggots . The criteria used for therapy evaluation were lesion size, maggot application time, and presence or absence of edema and secretions. Effective scarring and wound healing was observed after therapy with L. sericata larvae, i.e. 80% to 100% lesion area reduction after 12 hours. The preliminary results suggest that fly maggots of L. sericata have a ...
Reported is a hitherto unrecognized association of pulmonary hamartomas with salivary gland-type ... more Reported is a hitherto unrecognized association of pulmonary hamartomas with salivary gland-type tumors showing myoepithelial differentiation, namely, a case of myoepithelioma arising in a otherwise classic hamartoma with cartilage predominance, and a case of malignant mixed tumor arising in a predominantly fibrous hamartoma resembling mu¨llerian adenofibroma. The tumors occurred in middle-aged female patients of 35 and 44 years, respectively, and presented as 7 cm (treated with lobectomy) and 13 cm (treated with pneumonectomy) masses of the right upper lobe showing a short clinical history of cough, dyspnea, and wheezing. Both lesions did not present regional lymph node metastases after mediastinal lymphadenectomy. The myoepithelioma patient was well with no signs of recurrent disease at 6-month clinical control, but she was then lost to follow-up; the malignant mixed tumor patient is alive and well after 6 months since operation. Both tumors presented with morphologic and immunohistochemical features of myoepithelial cells, and we interpret them as being derived from a myoepithelial-like stromal cell population found within the hamartomatous areas, which is also consistently detected in classic pulmonary hamartoma. The lack of individual cell necrosis, mitotic activity, cell atypia, and pulmonary parenchyma infiltration supported a diagnosis of benign or unproven malignant potential tumor for the myoepithelioma, whereas the reverse held true for the other tumor in which the diagnosis of malignant mixed tumor of the lung was rendered. Their main importance of recognizing this association lies in separating these tumors histologically from other monophasic or biphasic tumors, either primary or secondary, such as pulmonary sarcomatoid carcinomas or true sarcomas, and metastatic salivary gland tumors, spindle cell carcinomas, melanomas, and soft tissue and visceral sarcomas.
Estudios Gerenciales, 2014
En la actualidad, los inversionistas, y en especial los de la industria manufacturera, carecen de... more En la actualidad, los inversionistas, y en especial los de la industria manufacturera, carecen de suficienteinformación que les permita evaluar cuál es la ciudad del PacÃfico latinoamericano que ofrece las mejorescondiciones para localizar su empresa. Para tal efecto, se ha desarrollado en este documento el escalafónglobal de ciudades para la atracción de inversión industrial en la cuenca del PacÃfico latinoamericano,con fundamento en 6 pilares para atraer la inversión extranjera, estimado mediante la metodologÃa deanálisis de componentes principales de los rangos. Los resultados indican que las ciudades más atractivaspara la inversión industrial fueron aquellas localizadas en paÃses con economÃas sólidas, acompaËœnadasde una infraestructura portuaria eficiente y considerables niveles de innovación, ciencia y tecnologÃa.
Biomédica, 2008
Preliminary evaluation of maggot (Diptera: Calliphoridae) therapy as a potential treatment for le... more Preliminary evaluation of maggot (Diptera: Calliphoridae) therapy as a potential treatment for leishmaniasis ulcers Introduction. Maggot debridement therapy has been widely used for treating a variety of scarredover soft-tissue wounds. Published accounts record several illnesses in which treatment with larval therapy has promoted injury healing in conjunction with infection by bacterial pathogens resistant to conventional antibiotics. Objective. An initial test of the maggot therapy was developed for cutaneous injuries produced by Leishmania amazonensis. Materials and methods. An experimental design based on an animal model with three replicates in Mesocricetus aureatus (Rodentia: Muridae) was used to evaluate size variation lesion before and after after larval therapy with Lucilia sericata maggots. The criteria used for therapy evaluation were lesion size, maggot application time, and presence or absence of edema and secretions. Results. Effective scarring and wound healing was observed after therapy with L. sericata larvae, i.e. 80% to 100% lesion area reduction after 12 hours. Conclusion. The preliminary results suggest that fly maggots of L. sericata have a potential use as natural medical and veterinary alternative therapy for the cutaneous leishmaniasis.
Tree Endophytes and Wood Biodegradation
Forestry Sciences, 2011
In nature, wood-decaying fungi play an important role in global carbon and nitrogen cycling by pr... more In nature, wood-decaying fungi play an important role in global carbon and nitrogen cycling by promoting the bioconversion of organic matter. Wood-decaying fungi colonize and degrade wood by attacking cell components with enzymatic and non-enzymatic systems. Some fungal endophytes can become activate and express the wood-decay machinery under suitable conditions. It has been proposed that endophytic fungi are involved in
Wood anatomy and biometric parameters variation of Eucalyptus globulus clones
Wood Science and Technology, 2008
Page 1. ORIGINAL Wood anatomy and biometric parameters variation of Eucalyptus globulus clones Ma... more Page 1. ORIGINAL Wood anatomy and biometric parameters variation of Eucalyptus globulus clones Mauricio Ramırez Æ Jaime Rodrıguez Æ Miguel Peredo Æ Sofia Valenzuela Æ Regis Mendonça Received: 12 November ...
Tree Genetics & Genomes, 2011
One hundred genotypes of Eucalyptus globulus were ranked according to specific consumption of woo... more One hundred genotypes of Eucalyptus globulus were ranked according to specific consumption of wood (cubic meters of wood needed to produce 1 ton of pulp). Ten of the most contrasting genotypes were separated in two groups of five clones each; group 1 (G1) with high wood density, high pulp yield, and low specific consumption, and group 2 (G2) with low density, low pulp yield, and high specific consumption. The contrasting genotypes also had significant differences in lignin content, percent syringyl unit composition, and frequency of β-O-4 linkages. Gene expression for phenylalanine ammonia-lyase (PAL), cinnamyl alcohol dehydrogenase (CAD), 4coumarate:CoA ligase (4CL) and ferulate 5-hydrolase (F5H) was analyzed in the contrasting genotypes. In both groups, transcript abundance for CAD, PAL, and 4CL were similar and only F5H presented significant differences between groups, with high values in the best ranked genotypes G1 in comparison to G2. Correlations between traits were estimated for lignin content vs. pulp yield (R 2 =0.97), pulp yield vs. syringyl units (R 2 =0.82), β-O-4 linkages vs. pulp yield (R 2 =0.84), and β-O-4 linkages vs. syringyl units (R 2 =0.97). Correlations between chemical composition and transcript abundance for F5H were calculated, finding correlation values with lignin content (R 2 =0.81), syringyl units (R 2 =0.83), and pulp yield (R 2 =0.81). The measurement of transcript abundance of F5H represents a potential genomic tool for tree improvement programs to select trees with high pulp yield.
Chlorophenol tolerant and degradative bacteria isolated from a river receiving pulp mill discharges
Toxicological & Environmental Chemistry, 2000
A screening was carried out in a river receiving pulp mill discharges (BioBio river, central Chil... more A screening was carried out in a river receiving pulp mill discharges (BioBio river, central Chile) to study the bacterial population able to tolerate and degrade chlorophenols. In four selected stations and at different seasons, water samples were taken from the river. Total bacterial population and the number of chlorophenol tolerant bacteria were counted. Bacterial tolerance to 25, 50, 100,
Revista Árvore, 2012
Tension (TW) and opposite wood (OW) of Eucalyptus globulus trees were analyzed for its chemical c... more Tension (TW) and opposite wood (OW) of Eucalyptus globulus trees were analyzed for its chemical characteristics and Kraft pulp production. Lignin content was 16% lower and contained 32% more syringyl units in TW than in OW. The increase in syringyl units favoured the formation of β-O-4 bonds that was also higher in TW than in OW (84% vs. 64%, respectively). The effect of these wood features was evaluated in the production of Kraft pulps from both types of wood. At kappa number 16, Kraft pulps obtained from TW demanded less active alkali in delignification and presented slightly higher or similar pulp yield than pulps made with OW. Fiber length, coarseness and intrinsic viscosity were also higher in tension than in opposite pulps. When pulps where refined to 30°SR, TW pulps needed 18% more revolutions in the PFI mill to achieve the same beating degree than OW pulps. Strength properties (tensile, tear and burst indexes) were slightly higher or similar in tension as compared with oppos...
Limnology and Oceanography, 1986
In the size range from 10−4 to 103 µg (carbon) body weight, the biomass of plankton in the euphot... more In the size range from 10−4 to 103 µg (carbon) body weight, the biomass of plankton in the euphotic layer of the North Pacific Central Gyre decreases as an allometric function of body weight. Even in a steady state ecosystem such as that analyzed here, there is variability in space and time; this suggests that one must be careful in extrapolating the relation to less predictable marine areas. In obtaining dynamic information from biomass spectra, one must distinguish changes due to the flow of energy within the spectrum (growth, predation, reproduction) from changes due to emigration from or immigration into the spectrum of the particular area sampled, such as those due to the diel vertical migration of macrozooplankton in the largest size classes.
Chemical Composition and Wood Anatomy ofEucalyptus globulusClones: Variations and Relationships with Pulpability and Handsheet Properties
Journal of Wood Chemistry and Technology, 2009
Abstract Variation and relationships among dasometric parameters, chemical composition, wood anat... more Abstract Variation and relationships among dasometric parameters, chemical composition, wood anatomy, pulpability (efficacy of kraft delignification), and handsheet properties were studied in fourteen 7-year-old Eucalyptus globulus clones grown in a clonal trial in the Bio ...
ESTIMATING THE DENSITY AND PULPING YIELD OF E. globulus WOOD BY DRIFT-MIR SPECTROSCOPY AND PRINCIPAL COMPONENTS REGRESSION (PCR)
Journal of the Chilean Chemical Society, 2003
... Juanita Freer,* José Ruiz,* Miguel A. Peredo , Jaime Rodríguez,* and Jaime Baeza,*. ... 4-7 T... more ... Juanita Freer,* José Ruiz,* Miguel A. Peredo , Jaime Rodríguez,* and Jaime Baeza,*. ... 4-7 Two vibrational regions - the mid and near-infrared-have been used to obtain information about woods. Samples can be examined by using either traditional transmission or reflectance. ...
Journal of the Chilean Chemical Society, 2009
Tribromophenol (TBP) is a halogenated phenol mainly used as an intermediate of flame retardants i... more Tribromophenol (TBP) is a halogenated phenol mainly used as an intermediate of flame retardants in the electronics manufacturing industry as well as a fungicide in the wood industry to prevent fungal wood stain and decay. As a result of this massive use, its bio-availability, toxicity, and environmental fate are of increasing concern worldwide. TBP degradation by a catechol (CAT)-driven Fenton reaction was studied. In order to achieve the best yield in TBP degradation, an experimental design was applied for multivariate optimization of the experimental degrading system variables. At optimized concentrations, the CAT-driven Fenton reaction yielded 75% TBP degradation in 2 h at room temperature. The multivariate optimization showed that the highest TBP degradation (1 mol base) was obtained at a ratio of CAT: FeCl 3 : H 2 O 2 = 0.150 : 0.211: 5.100 at pH = 3.4. A time course degradation of TBP comparing the CAT-driven Fenton reaction with the classical Fenton reaction is also presented. During the first hours of reaction (up to 8h), increased degradation efficiencies were observed in the CAT-driven Fenton reaction in comparison with the conventional Fenton reaction. Possible causes for the observed behavior are also discussed.
Journal of Plankton Research, 1996
In this paper, we describe a study of the role of turbulence in the loss by sedimentation of phyt... more In this paper, we describe a study of the role of turbulence in the loss by sedimentation of phytoplankton cells from the mixed layer. The approach presented allows the quantification of the sedimentation rate of phytoplankton in the whole range of turbulence levels of this layer. Two types of phytoplankter can be distinguished according to the effect that turbulence can exert on their sedimentation rate.The rate of those cells whose settling velocity is lower than-lm day" 1 will not be modified by turbulence. The sedimentation rate of cells with higher settling velocities can, however, be modified by the level of turbulence. A set of dimensionless numbers is given to delimit several processes that are important in the dynamics of phytoplankton sedimentation in a turbulent regime. The use of these dimensionless numbers suggests that an increase in the turbulence level in the mixed layer does not always imply a decrease in the sedimentation rate of phytoplankton cells.
Biomass photochemistry XIII: pre-irradiated lignin from Pinus Radiata D. Don and its degradation by ligninase and horse-radish peroxidase
Journal of Photochemistry and Photobiology A: Chemistry, 1988
... NELSON DURANt Instituto de Quimica, Biological Chemistry Laboratory, Universidade Estadual de... more ... NELSON DURANt Instituto de Quimica, Biological Chemistry Laboratory, Universidade Estadual de Campinas, CP 6154, Campinas, CEP 13.08 1, Sao Paulo (Brazil) IRENE FERRER Facultad de Qulmica, Pontificia Universidad Catolica de Chile, Casilla 6177, Santiago (Chile ...
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Papers by Jaime Fernando Gomez Rodríguez