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Mamani Aedo Diego - One of the best experts on this subject based on the ideXlab platform.
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Efecto antibacteriano del extracto etanolico de Malva sylvestris l. sobre escherichia coli atcc 8739 comparado con gentamicina estudio in vitro
'Universidad Cesar Vallejo', 2019Co-Authors: Mamani Aedo DiegoAbstract:Se evaluó si el extracto etanólico de Malva Sylvestris L. “Malva” tiene efecto antibacteriano sobre cepas de Escherichia coli ATCC 8739 comparado con gentamicina a 10 µg. In vitro. El extracto fue obtenido a través del método de maceración y se realizaron cuatro diluciones, al 100%, 75%, 50%, 25%. Las cepas fueron cultivadas en agar Mueller-Hinton y la sensibilidad se realizó con KirbyBauer. Se encontró efecto inhibitorio a partir de la dilución al 50%, sin embargo, a partir del 100% muestra halo de inhibición de 15.70 mm (DS: 1.252±0.396 IC95% (14.80 – 16.60), con rango De 14 a 18 mm), con valores considerados eficaces Según CLSI (=15 mm). La gentamicina obtuvo Halo inhibitorio de 21.50 mm (DS: 0.972±0.307 IC95% (20.80– 22.20), con rango de 20 a 23 mm). Según el análisis estadístico los resultados son altamente significativos (ANOVA – 0.000) pero los Grupos heterogéneos (test de Dunnet), evidenciando que a mayor concentración del extracto Aumenta el efecto inhibitorio pero no supera al de gentamicina. Se concluye que el extracto etanólico de Malva Sylvestris L. tiene efecto antibacteriano al aumentar la concentración del extracto (CSLI=15 mm), sin embargo es menor que el de la gentamicina
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Efecto antibacteriano del extracto etanolico de Malva sylvestris l. sobre escherichia coli atcc 8739 comparado con gentamicina estudio in vitro
'Universidad Cesar Vallejo', 2019Co-Authors: Mamani Aedo DiegoAbstract:TesisTrujilloEscuela Académico Profesional de MedicinaEnfermedades Infecciosas y TransmisiblesSe evaluó si el extracto etanólico de Malva Sylvestris L. “Malva” tiene efecto antibacteriano sobre cepas de Escherichia coli ATCC 8739 comparado con gentamicina a 10 µg. In vitro. El extracto fue obtenido a través del método de maceración y se realizaron cuatro diluciones, al 100%, 75%, 50%, 25%. Las cepas fueron cultivadas en agar Mueller-Hinton y la sensibilidad se realizó con KirbyBauer. Se encontró efecto inhibitorio a partir de la dilución al 50%, sin embargo, a partir del 100% muestra halo de inhibición de 15.70 mm (DS: 1.252±0.396 IC95% (14.80 – 16.60), con rango De 14 a 18 mm), con valores considerados eficaces Según CLSI (=15 mm). La gentamicina obtuvo Halo inhibitorio de 21.50 mm (DS: 0.972±0.307 IC95% (20.80– 22.20), con rango de 20 a 23 mm). Según el análisis estadístico los resultados son altamente significativos (ANOVA – 0.000) pero los Grupos heterogéneos (test de Dunnet), evidenciando que a mayor concentración del extracto Aumenta el efecto inhibitorio pero no supera al de gentamicina. Se concluye que el extracto etanólico de Malva Sylvestris L. tiene efecto antibacteriano al aumentar la concentración del extracto (CSLI=15 mm), sin embargo es menor que el de la gentamicina
Roberte M D Makowski - One of the best experts on this subject based on the ideXlab platform.
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latent infections and penetration of the bioherbicide agent colletotrichum gloeosporioides f sp Malvae in non target field crops under controlled environmental conditions
Fungal Biology, 1998Co-Authors: Roberte M D Makowski, Knud MortensenAbstract:Colletotrichum gloeosporioides f. sp. Malvae (C. g. Malvae) is effective in controlling round-leaved mallow (Malva pusilla) , a common weed in the Canadian prairies. To confirm host range experiments, the latent period and penetration of C. g. Malvae was determined under controlled environmental conditions on field crops (wheat, flax, lentil, mustard, rape seed, sugar beet, sunflower, safflower) and on crops in the Malvaceae (okra and cotton) as well as on round-leaved mallow, from which C. g. Malvae was originally isolated. In non-target crop plants, very little germination, appressoria formation, or penetration of C. g. Malvae were observed compared with the infection occurring on round-leaved mallow. Of the non-target species tested, most penetration was observed on safflower, with only 5·1% penetration form the total appressoria formed compared with 17% on round-leaved mallow. C. g. Malvae was re-isolated from all crop cvs tested, but only from inoculated stems and leaves. The recovery of C. g. Malvae significantly decreased with time of isolation of plant material for most cvs. Of the millions of conidia applied to non-target crops, only a few were present after 72 h, few appressoria were produced, and only minimal penetration occurred. The behaviour of C. g. Malvae conidia on the surface of leaf material of non-target plants supports the visual disease ratings observed in the experiments of crop tolerance under controlled and field condition and host-range tests.
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effect of inoculum concentration temperature dew period and plant growth stage on disease of round leaved mallow and velvetleaf by colletotrichum gloeosporioides f sp Malvae
Phytopathology, 1993Co-Authors: Roberte M D MakowskiAbstract:In greenhouse and controlled-environment tests, disease development on round-leaved mallow (Malva pusilla) and velvetleaf (Abutilon theophrasti) of Colletotrichum gloeosporioides f. sp. Malvae was affected by inoculum concentration and plant growth stage at time of inoculation, postinoculation air temperature, and dew-period duration and temperature. The highest levels of control were obtained with an inoculum concentration of 210 6 spores per milliliter for M. pusilla and 4×10 6 spores per milliliter for A. theophrasti. All growth stages were susceptible, although younger seedlings were less susceptible than older plants. Postinoculation air temperatures of 30 C for M. putilla and >15 C for A. theophrasti reduced disease development significantly [...]
Visith Chavasit - One of the best experts on this subject based on the ideXlab platform.
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in vitro retardation of glucose diffusion with gum extracted from Malva nut seeds produced in thailand
Food Chemistry, 2011Co-Authors: Anchalee Srichamroen, Visith ChavasitAbstract:Mucilage of Malva nut fruit has been used as traditional medicine in Thailand. Our laboratory has succeeded in extracting Malva nut gum (MNG) from Malva nut seeds by using alkaline-extraction method. The extract had higher gelling properties compared to water-extracted MNG. This research was aimed to investigate the effect of MNG on the retardation of glucose diffusion in in vitro dialysis processes. The results showed that alkaline-extracted MNG significantly (p < 0.05) reduced glucose content in dialysate compared to control containing no dietary fibre. MNG at 1% (w/w) concentration was more effective than that of 0.5% (w/w) concentration. The mixture of MNG and guar gum significantly (p < 0.05) reduced glucose in dialysate by 50–82% compared to that of control. In starch digestion process, the mixture of MNG and guar gum showed greater reduction of glucose (3–7 folds) in dialysate at 15–30 min.
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rheological properties of extracted Malva nut gum scaphium scaphigerum in different conditions of solvent
Food Hydrocolloids, 2011Co-Authors: Anchalee Srichamroen, Visith ChavasitAbstract:Mucilage of Malva nut fruit has been used as traditional medicine in Thailand. Health benefits of this mucilage are linked to its gelling property. This research was aimed to evaluate oscillatory rheological properties of Malva nut gum (MNG) in different conditions of solvent (pH, ionic strength, and co-solutes addition). A small strain oscillation (0.1% strain) was used to investigate gelling properties of MNGs extracted with alkaline solutions compared to original MNG. Alkaline extracted MNGs showed higher storage modulus than did the original MNG. FT-IR of alkaline extracted MNGs showed carboxylic bonds with the reduction of galacturonic acids to increase the storage modulus compared to that of original MNG. Sodium chloride and calcium chloride strongly influenced the swelling of MNG, while the effect was smaller with K þ and Mg 2þ ions. Addition of 5% sucrose into MNG solution increased gel strength of
Sergio Neves Monteiro - One of the best experts on this subject based on the ideXlab platform.
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charpy impact test in polyester matrix composites reinforced with hybrid blanket of the jute and Malva fibers
TMS Annual Meeting & Exhibition, 2018Co-Authors: Jean Igor Margem, Frederico Muylaert Margem, Sergio Neves Monteiro, Ygor Macabu De Moraes, Marina Rangel MargemAbstract:Natural fibers presents interfacial characteristics with polymeric matrices that favor a high impact energy absorption by the composite structure. The objective of this work was then to assess the charpy impact resistance of polymeric composites reinforced with one or two layers of batt jute and Malva fibers. The results showed a remarkable increase in the notch toughness with increasing layers of jute blankets and Malva. This can be attributed to a preferential debonding of the fiber/matrix interface, which contributes to an elevated absorbed energy.
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ballistic performance in multilayer armor with epoxy composite reinforced with Malva fibers
2017Co-Authors: Lucio Fabio Cassiano Nascimento, Sergio Neves Monteiro, Luis Louro, Alaelson Vieira Gomes, Edio Pereira Lima, Rubens Lincoln Santana Blazutti MarcalAbstract:A multilayer armoring system (MAS) is commonly formed by three layers. The initial layer is normally composed by a ceramic with high compressive strength, which absorbs most of the kinetic projectile energy. The subsequent composite layer was formed by epoxy matrix reinforced with natural Malva fibers (Urena lobata, Linn), in the form of pure or hybrid fabric with jute fibers, in order to absorb part of the kinetic energy, and to retain ceramic and projectile shrapnel. A third layer formed by aluminum alloy, was included as a penetration restrictor for bullet and fragments by plastic deformation. The ballistic efficiency was evaluated by penetration of the 7.62 × 51 mm ammunition into a clay witness backing the armor. The results showed a great potential by epoxy composites reinforced with Malva fabric as compared to other natural fibers and materials traditionally used in personal protection, such as Kevlar™ aramid.
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evaluation of ballistic armor behavior with epoxy composite reinforced with Malva fibers
2017Co-Authors: Lucio Fabio Cassiano Nascimento, Sergio Neves Monteiro, Alaelson Vieira Gomes, Luane Isquerdo Ferreira Holanda, Luis Henrique Leme Louro, Edio Pereira LimaAbstract:In the present study, we used natural fibers Malva (Urena lobata, Linn) in 0, 15 and 30 vol.% as reinforcement of epoxy matrix composites to ballistic application. Ballistic efficiency of these composites was assessed by measuring the energy absorbed and residual velocity after impact 9 mm FMJ ammunition projectile, aiming to compare with traditional materials, such as: aramid fabric Kevlar™ used in vests for personal protection. The results showed by visual analysis and scanning electron microscopy (SEM) that the main active failure mechanisms in composites were delamination layers and fiber rupture. In test groups can be seen that the absorbed energy and the residual velocity varies with the fiber percentage used. Compared to aramid there is both a gain in weight and cost of the ballistic armor, which makes the fiber Malva a promising material applications involving personal protection against 9 mm caliber ammunition.
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Flexural Behavior of Epoxy Matrix Composites Reinforced with Malva Fiber
Materials Research-ibero-american Journal of Materials, 2015Co-Authors: Jean Igor Margem, Vinicius Alves Gomes, Carolina Gomes Dias Ribeiro, Frederico Muylaert Margem, Fabio De Oliveira Braga, Sergio Neves MonteiroAbstract:Polymer composites reinforced with natural fibers have been increasingly investigated and applied as engineering materials owing to their economical, technical, societal and environmental advantages. The Malva fiber, particularly an important resource in the Amazon region in Brazil, only recently begin to be investigated as possible composite reinforcement for engineering application. However, the mechanical properties of composites reinforced with Malva fiber are still unknown. In this paper, the flexural behavior of epoxy matrix composites reinforced with continuous Malva fiber was for the first time investigated. Specimens of continuous Malva fibers aligned along an epoxy matrix were press-molded. Three-points bending test were performed and the fractured specimens were analyzed by SEM. The results showed a marked improvement in the composites flexural properties with the increase in the amount of reinforced Malva fiber. This improvement was found to match the Rule of Mixtures, which revealed the unique potential of Malva composites for engineering applications.
Jean Igor Margem - One of the best experts on this subject based on the ideXlab platform.
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charpy impact test in polyester matrix composites reinforced with hybrid blanket of the jute and Malva fibers
TMS Annual Meeting & Exhibition, 2018Co-Authors: Jean Igor Margem, Frederico Muylaert Margem, Sergio Neves Monteiro, Ygor Macabu De Moraes, Marina Rangel MargemAbstract:Natural fibers presents interfacial characteristics with polymeric matrices that favor a high impact energy absorption by the composite structure. The objective of this work was then to assess the charpy impact resistance of polymeric composites reinforced with one or two layers of batt jute and Malva fibers. The results showed a remarkable increase in the notch toughness with increasing layers of jute blankets and Malva. This can be attributed to a preferential debonding of the fiber/matrix interface, which contributes to an elevated absorbed energy.
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Flexural Behavior of Epoxy Matrix Composites Reinforced with Malva Fiber
Materials Research-ibero-american Journal of Materials, 2015Co-Authors: Jean Igor Margem, Vinicius Alves Gomes, Carolina Gomes Dias Ribeiro, Frederico Muylaert Margem, Fabio De Oliveira Braga, Sergio Neves MonteiroAbstract:Polymer composites reinforced with natural fibers have been increasingly investigated and applied as engineering materials owing to their economical, technical, societal and environmental advantages. The Malva fiber, particularly an important resource in the Amazon region in Brazil, only recently begin to be investigated as possible composite reinforcement for engineering application. However, the mechanical properties of composites reinforced with Malva fiber are still unknown. In this paper, the flexural behavior of epoxy matrix composites reinforced with continuous Malva fiber was for the first time investigated. Specimens of continuous Malva fibers aligned along an epoxy matrix were press-molded. Three-points bending test were performed and the fractured specimens were analyzed by SEM. The results showed a marked improvement in the composites flexural properties with the increase in the amount of reinforced Malva fiber. This improvement was found to match the Rule of Mixtures, which revealed the unique potential of Malva composites for engineering applications.
