Efecto sobre la acidez del papel de cinco extractos de plantas que poseen actividad biocida

Se valoró el efecto de cinco biocidas naturales obtenidos de las plantas Allium sativum Linn, Eucalyptus citriodora Hook, Pinus caribaea Morelet, Piper auritum H.B.K. y Ricinus communis Linn, sobre la permanencia del papel. Las variables evaluadas fueron reserva alcalina y pH, antes y después de un envejecimiento artificial por calor seco. No se encontraron diferencias estadísticamente significativas al realizar las comparaciones

Efecto sobre la acidez del papel de cinco extractos de plantas que poseen actividad biocida

Se valoró el efecto de cinco biocidas naturales obtenidos de las plantas Allium sativum Linn, Eucalyptus citriodora Hook, Pinus caribaea Morelet, Piper auritum H.B.K. y Ricinus communis Linn, sobre la permanencia del papel. Las variables evaluadas fueron reserva alcalina y pH, antes y después de un envejecimiento artificial por calor seco. No se encontraron diferencias estadísticamente significativas al realizar las comparaciones

Efecto sobre la acidez del papel de cinco extractos de plantas que poseen actividad biocida

Se valoró el efecto de cinco biocidas naturales obtenidos de las plantas Allium sativum Linn, Eucalyptus citriodora Hook, Pinus caribaea Morelet, Piper auritum H.B.K. y Ricinus communis Linn, sobre la permanencia del papel. Las variables evaluadas fueron reserva alcalina y pH, antes y después de un envejecimiento artificial por calor seco. No se encontraron diferencias estadísticamente significativas al realizar las comparaciones

Environmentally friendly extracts from <i>Eucalyptus citriodora</i> Hook. and <i>Pinus caribaea</i> Morelet their application in the control of the biofilms in biodeterioration on paper

Biodeterioration of archivalmaterials involves alteration of physicochemical and mechanical properties by organisms. This causes loss of aesthetic properties and irreversible degradation of documents. Since ancient times, extracts of plants have been used as antimicrobials in various fields. The use of such environmentally friendly products in the biodeterioration field is viable and has economic, environmental and ecological advantages. The aims of this research were: i) qualitative identification of secondary metabolites in natural extracts of Eucalyptus citriodora Hook. and Pinus caribaea Morelet, ii) evaluation of the biocidal activity of the extracts on adherence to paper and biofilmformation by Bacillus sp., iii) evaluation of the antimicrobial effects of the extracts on Bacillus sp. and Bacillus thuringiensis isolated fromarchivalmaterials. Compounds identified in the extracts included alkaloids, cumarines, flavonoids, phenols, tannins, terpenes and steroids. The antimicrobial activity was studied by the agar diffusion technique. Significant holes of inhibition were obtained.Aged papers adsorbed with extracts in the presence of Bacillus sp were tested. A decrease ofmicroorganisms adhesion and biofilmformation to paper adsorbed with extracts was observed.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasComisión de Investigaciones Científicas de la provincia de Buenos AiresFacultad de Ciencias Naturales y MuseoConsejo Nacional de Investigaciones Científicas y Técnica

Environmentally friendly extracts from <i>Eucalyptus citriodora</i> Hook. and <i>Pinus caribaea</i> Morelet their application in the control of the biofilms in biodeterioration on paper

Biodeterioration of archivalmaterials involves alteration of physicochemical and mechanical properties by organisms. This causes loss of aesthetic properties and irreversible degradation of documents. Since ancient times, extracts of plants have been used as antimicrobials in various fields. The use of such environmentally friendly products in the biodeterioration field is viable and has economic, environmental and ecological advantages. The aims of this research were: i) qualitative identification of secondary metabolites in natural extracts of Eucalyptus citriodora Hook. and Pinus caribaea Morelet, ii) evaluation of the biocidal activity of the extracts on adherence to paper and biofilmformation by Bacillus sp., iii) evaluation of the antimicrobial effects of the extracts on Bacillus sp. and Bacillus thuringiensis isolated fromarchivalmaterials. Compounds identified in the extracts included alkaloids, cumarines, flavonoids, phenols, tannins, terpenes and steroids. The antimicrobial activity was studied by the agar diffusion technique. Significant holes of inhibition were obtained.Aged papers adsorbed with extracts in the presence of Bacillus sp were tested. A decrease ofmicroorganisms adhesion and biofilmformation to paper adsorbed with extracts was observed.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasComisión de Investigaciones Científicas de la provincia de Buenos AiresFacultad de Ciencias Naturales y MuseoConsejo Nacional de Investigaciones Científicas y Técnica

Environmentally friendly extracts from <i>Eucalyptus citriodora</i> Hook. and <i>Pinus caribaea</i> Morelet their application in the control of the biofilms in biodeterioration on paper

Biodeterioration of archivalmaterials involves alteration of physicochemical and mechanical properties by organisms. This causes loss of aesthetic properties and irreversible degradation of documents. Since ancient times, extracts of plants have been used as antimicrobials in various fields. The use of such environmentally friendly products in the biodeterioration field is viable and has economic, environmental and ecological advantages. The aims of this research were: i) qualitative identification of secondary metabolites in natural extracts of Eucalyptus citriodora Hook. and Pinus caribaea Morelet, ii) evaluation of the biocidal activity of the extracts on adherence to paper and biofilmformation by Bacillus sp., iii) evaluation of the antimicrobial effects of the extracts on Bacillus sp. and Bacillus thuringiensis isolated fromarchivalmaterials. Compounds identified in the extracts included alkaloids, cumarines, flavonoids, phenols, tannins, terpenes and steroids. The antimicrobial activity was studied by the agar diffusion technique. Significant holes of inhibition were obtained.Aged papers adsorbed with extracts in the presence of Bacillus sp were tested. A decrease ofmicroorganisms adhesion and biofilmformation to paper adsorbed with extracts was observed.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasComisión de Investigaciones Científicas de la provincia de Buenos AiresFacultad de Ciencias Naturales y MuseoConsejo Nacional de Investigaciones Científicas y Técnica

Dietary fatty acids and lipoproteins on progression of age-related macular degeneration

Age-related macular degeneration (AMD) is a medical condition of central loss vision and blindness. Numerous studies have revealed that changes on certain dietary fatty acids (FAs) could have useful for AMD management. This review summarizes the effects of dietary omega-3 long-chain PUFAs, MUFAs, and SFAs, and lipoproteins on AMD. Findings are consistent with the beneficial role of dietary omega-3 long-chain PUFAs, while the effects of dietary MUFAs and SFAs appeared to be ambiguous with respect to the possible protection from MUFAs and to the possible adverse impact from SFAs on AMD. Some of the pathological mechanisms associated with lipoproteins on AMD share those observed previously in cardiovascular diseases. It was also noticed that the effects of FAs in the diet and lipoprotein on AMD could be modulated by genetic variants. From a population health perspective, the findings of this review are in favour of omega-3 long-chain FAs recommendations in a preventive and therapeutic regimen to attain lower AMD occurrence and progression rates. Additional long-term and short-term nutrigenomic studies are required to clearly establish the role and the relevance of interaction of dietary FAs, lipoproteins, and genes in the genesis and progression of AMD

Water Supply Source Evaluation in Unmanaged Aquifer Recharge Zones: The Mezquital Valley (Mexico) Case Study

The Mezquital Valley (MV) hosts the largest unmanaged aquifer recharge scheme in the world. The metropolitan area of Mexico City discharges ~60 m3/s of raw wastewater into the valley, a substantial share of which infiltrates into the regional aquifer. In this work, we aim to develop a comprehensive approach, adapted from oil and gas reservoir modeling frameworks, to assess water supply sources located downgradient from unmanaged aquifer recharge zones. The methodology is demonstrated through its application to the Mezquital Valley region. Geological, geoelectrical, petrophysical and hydraulic information is combined into a 3D subsurface model and used to evaluate downgradient supply sources. Although hydrogeochemical variables are yet to be assessed, outcomes suggest that the newly-found groundwater sources may provide a long-term solution for water supply. Piezometric analyses based on 25-year records suggest that the MV is close to steady-state conditions. Thus, unmanaged recharge seems to have been regulating the groundwater balance for the last decades. The transition from unmanaged to managed recharge is expected to provide benefits to the MV inhabitants. It will also be likely to generate new uncertainties in relation to aquifer dynamics and downgradient systems

Isolated Fraction of <i>Ricinus communis</i> L. in the Control of Biodeterioration of Heritage Documents

Microorganismos, insectos y roedores causan alteraciones en documentos y objetos de interés patrimonial. Para combatirlos son empleados numerosos métodos; algunos causan un impacto negativo en el medio ambiente, dañan la salud del personal que los aplica y aceleran el proceso natural de deterioro. Los productos naturales obtenidos de plantas son una elección efectiva para combatirlos pues, entre sus beneficios, está el no contaminar el medio ambiente. El objetivo de este trabajo fue determinar el efecto biocida de una fracción aislada de hojas de Ricinus communiss L. (Euphorbiaceae) en el control del biodeterioro de documentos patrimoniales. Se evaluó su actividad antimicrobiana frente a microorganismos aislados de documentos depositados en el Archivo Nacional de la República de Cuba y en el Archivo Histórico del Museo de La Plata, Argentina. Se determinó el efecto de la fracción sobre la acidez y la reserva alcalina del papel después de un proceso de envejecimiento acelerado y se calculó la dosis letal media (DL50) en ratones. La fracción de R. communis se aisló por extracciones sucesivas con solventes orgánicos de polaridad creciente. La caracterización química de la fracción aislada se determinó por espectroscopía IR y cromatografía en silicagel. El espectro IR mostró la presencia de un grupo nitrilo y otro, grupo carboxilo. En la cromatografía se identificaron 7 compuestos, entre los que predominaron ricinina y rutina. La actividad antimicrobiana se determinó por el método de difusión radial simple y tuvieron efecto dosis dependiente sobre Enterobacter agglomerans, Bacillus polimixa y Streptomyces sp. No se encontraron variaciones estadísticamente significativas en los valores de pH y la reserva alcalina. Estos y futuros resultados permitirán obtener un producto natural con actividad biocida, útil en el control del biodeterioro.Microorganisms, insects and rodents cause alterations in documents and heritage objects of interest. To combat them numerous methods are employed, some have a negative impact on the environment, they also damage the health of the staff who apply them, and accelerate the natural process of deterioration. Natural products from plants are an effective choice to combat them, among their benefits, one is not polluting the environment. The objective of this work was to determine the biocidal effect of a fraction isolated from leaves of Ricinus communis L. in the control of biodeterioration of heritage documents. We evaluated their antimicrobial activity against isolates of documents deposited in the National Archives of the Republic of Cuba and in the Historical Archive of the Museum of La Plata, Argentina. The effect of the fraction of the alkaline reserve and acidity of paper after an accelerated aging process was determined, and the median lethal dose (LD50) in B6D2F1 male mice (18-20 g) was calculated. The Ricinus communis L. fraction was isolated by successive extractions with organic solvents of increasing polarity. The chemical characterization of the isolated fraction was determined by IR spectroscopy and chromatography on silica gel. The IR spectrum showed a band at 2222 cm-1 attributed to the nitrile group and another band at 1659 cm-1 attributed to the carboxyl group. The chromatography showed 7 elements among which ricin and rutine predominated. The antimicrobial activity was determined by single radial diffusion method. Concentrations of 0.5 and 1.0 mg / hole were dose dependent on Enterobacter agglomerans, Bacillus polimixa, and Streptomyces sp. There were no statistically significant variations in the values of pH and alkaline reserve. The oral LD50 was calculated at 388.08 mg / Kg. These, and future results will get a natural product with biocidal activity, useful in biodeterioration.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasCentro de Investigación y Desarrollo en Tecnología de PinturasFacultad de Ciencias Veterinaria

Isolated Fraction of <i>Ricinus communis</i> L. in the Control of Biodeterioration of Heritage Documents

Microorganismos, insectos y roedores causan alteraciones en documentos y objetos de interés patrimonial. Para combatirlos son empleados numerosos métodos; algunos causan un impacto negativo en el medio ambiente, dañan la salud del personal que los aplica y aceleran el proceso natural de deterioro. Los productos naturales obtenidos de plantas son una elección efectiva para combatirlos pues, entre sus beneficios, está el no contaminar el medio ambiente. El objetivo de este trabajo fue determinar el efecto biocida de una fracción aislada de hojas de Ricinus communiss L. (Euphorbiaceae) en el control del biodeterioro de documentos patrimoniales. Se evaluó su actividad antimicrobiana frente a microorganismos aislados de documentos depositados en el Archivo Nacional de la República de Cuba y en el Archivo Histórico del Museo de La Plata, Argentina. Se determinó el efecto de la fracción sobre la acidez y la reserva alcalina del papel después de un proceso de envejecimiento acelerado y se calculó la dosis letal media (DL50) en ratones. La fracción de R. communis se aisló por extracciones sucesivas con solventes orgánicos de polaridad creciente. La caracterización química de la fracción aislada se determinó por espectroscopía IR y cromatografía en silicagel. El espectro IR mostró la presencia de un grupo nitrilo y otro, grupo carboxilo. En la cromatografía se identificaron 7 compuestos, entre los que predominaron ricinina y rutina. La actividad antimicrobiana se determinó por el método de difusión radial simple y tuvieron efecto dosis dependiente sobre Enterobacter agglomerans, Bacillus polimixa y Streptomyces sp. No se encontraron variaciones estadísticamente significativas en los valores de pH y la reserva alcalina. Estos y futuros resultados permitirán obtener un producto natural con actividad biocida, útil en el control del biodeterioro.Microorganisms, insects and rodents cause alterations in documents and heritage objects of interest. To combat them numerous methods are employed, some have a negative impact on the environment, they also damage the health of the staff who apply them, and accelerate the natural process of deterioration. Natural products from plants are an effective choice to combat them, among their benefits, one is not polluting the environment. The objective of this work was to determine the biocidal effect of a fraction isolated from leaves of Ricinus communis L. in the control of biodeterioration of heritage documents. We evaluated their antimicrobial activity against isolates of documents deposited in the National Archives of the Republic of Cuba and in the Historical Archive of the Museum of La Plata, Argentina. The effect of the fraction of the alkaline reserve and acidity of paper after an accelerated aging process was determined, and the median lethal dose (LD50) in B6D2F1 male mice (18-20 g) was calculated. The Ricinus communis L. fraction was isolated by successive extractions with organic solvents of increasing polarity. The chemical characterization of the isolated fraction was determined by IR spectroscopy and chromatography on silica gel. The IR spectrum showed a band at 2222 cm-1 attributed to the nitrile group and another band at 1659 cm-1 attributed to the carboxyl group. The chromatography showed 7 elements among which ricin and rutine predominated. The antimicrobial activity was determined by single radial diffusion method. Concentrations of 0.5 and 1.0 mg / hole were dose dependent on Enterobacter agglomerans, Bacillus polimixa, and Streptomyces sp. There were no statistically significant variations in the values of pH and alkaline reserve. The oral LD50 was calculated at 388.08 mg / Kg. These, and future results will get a natural product with biocidal activity, useful in biodeterioration.Instituto de Investigaciones Fisicoquímicas Teóricas y AplicadasCentro de Investigación y Desarrollo en Tecnología de PinturasFacultad de Ciencias Veterinaria