ABSTRACT Abstract: Monitoring campaigns in two different seasons were carried out at two undergro... more ABSTRACT Abstract: Monitoring campaigns in two different seasons were carried out at two underground stations (Tacubaya and Azcapotzalco) of the subway of Mexico City, in order to assess airborne bacterial and fungi concentrations, as well as their relationship with several factors, such as depth of the station, sampling site, temperature, and relative humidity. Sixteen sampling sites were selected according to the depth of the lines and the transit of passengers in the corridors, concourses, and platforms. In addition, samples were also collected in the carriages when they were in movement. Outdoor samples were taken at the two stations for comparison. Two-stage multiorifice cascade impactors were used to collect aerobiological particles, and with the aid of macroscopicand microscopic characterization were found 57 fungi and 61 bacteria colonies. Outdoor bacteria concentrations ranged from 1 to 68 CFU m-3, while fungi concentrations varied from 6 to 80 CFU m-3. The indoor concentration levels of bacteria and fungi ranged from 1 to 484 CFU m-3 and from 51 to 715 CFU m-3, respectively. Fungi and bacteria indoor concentrations in the subway were higher than outdoor, up to 8 times. Most of bacteria were identified as Gram-positive nonsporulating short bacillus, while the most abundant fungi genera identified were Aspergillus, Penicillium, and Alternaria in that order of frequency. statistical analysis showed significant differences between the stations and the lines of different depths, showing a greater microorganisms’ concentration with a greater depth. Although bacteria and fungi concentrations were higher in the spring than in winter, this difference was not significant. Even if indoor microbiological pollution in underground stations was higher than outdoor, the concentrations found in this study were lower than indoor air international standards.
Here, we present for the first time, a method to generate homozygous segmental introgressions, by... more Here, we present for the first time, a method to generate homozygous segmental introgressions, by means of crosses between a pair of synmorphic species. The introgressions were monitored by the cytogenetic method of polygenic chromosome asynapses. Later the introgressions were evaluated in their capacity to produce sterility in segmental males. Also, the smallest segment with the capacity to produce sterility in segmental males was mapped by in situ hybridization of polythene chromosomes, using 8 sequences of BACs clones as probes. Finally, a bioinformatic analysis was carried out to identify the presence of particular genes. From 2 parental strains, D. buzzatii and D. koepferae, 6 simple segmental hybrid lines were generated, whose introgressing segments are distributed along chromosome 4 of these species. From the 6 simple segmental lines and by means of a new crossing strategy, the 6 respective homozygous segmental hybrid offspring were obtained, each of them carrying a specific ...
The pick in the use of noble metal nanoparticles (NPs) in various fields has resulted in inorgani... more The pick in the use of noble metal nanoparticles (NPs) in various fields has resulted in inorganic synthesis of metal NPs, however the methodologies used for their preparation are generally expensive and involve the use of hazardous chemicals, is why has recently increased the development of sustainable and environmentally friendly alternatives. Synthesize biologically AuNPs is easy, inexpensive and is less damaging to the environment. The use of plant extracts for the synthesis of nanomaterials has not yet been fully explored, however represents a good alternative as well as the aforementioned advantages are obtained stable NPs of different size and shape. In this work the synthesis and characterization of AuNPs wasnperformed, and their functionalization with specific DNA probes of two microorganisms of environmental interest Achlya sp. and Escherichia coli (E. coli). Achlya sp. is a fungus that infects fish farms, aquariums and natural reservoirs; E coli is a bacteria pathogenic t...
Mundo Nano. Revista Interdisciplinaria en Nanociencias y Nanotecnología
Metallic nanoparticles (NPs) are being used mainly because they have excellent physical, chemical... more Metallic nanoparticles (NPs) are being used mainly because they have excellent physical, chemical and biological properties, intrinsic to their size, therefore there is a boom in the use of these nanoparticles in various fields and recently, due to the pandemic about coronavirus. Copper NPs began to be used for use in medical supplies such as face masks. NPs are normally obtained through inorganic synthesis, however, the methodologies used to obtain them are in general terms expensive and involve the use of hazardous chemicals, which has increased the development of sustainable and environmentally friendly alternatives, as one of the main objectives of nanotechnology. Considering that nanoparticle biosynthesis is of greatest importance since it allowed obtaining organic NPs through an environmentally friendly; quick and inexpensive. In this work, the synthesis and characterization of AuNPs of six different plant extracts that in traditional medicine are used for respiratory diseases...
Int. J. Biomedical Nanoscience and Nanotechnology, 2020
The synthesis of metallic nanoparticles (NPs) is currently performed through the development of m... more The synthesis of metallic nanoparticles (NPs) is currently performed through the development of methodologies using microorganisms, plant extracts, and even organic waste, seeking to mitigate the impact on the environment. However, for both synthesis and biosynthesis, it is necessary to consider physical and chemical factors such as temperature, stirring and pH, that allow controlling size and shape in an accurate way, as size and shape play an important role in the optical, electronic and thermal properties and determine many features of the structure and activity of molecules and biomolecules. In this work, we carry out chemical synthesis and biosynthesis of AuNPs at acidic (3-6), neutral (7) and basic (9) pH; the process is fast, simple and eco-friendly. We obtained AuNPs from 5-100 nm and determined that the pH of the solution is a key factor in the distribution and shape of the nanoparticles. Uniform AuNPs were obtained at neutral pH, or values of pH near neutrality. In addition, they have potential applications in various fields, due to their optical, magnetic, catalytic and electrical properties.
Journal of Nanomaterials & Molecular Nanotechnology, 2016
This work, conducted biological synthesis and characterization of gold nanoparticles (AuNPs) thro... more This work, conducted biological synthesis and characterization of gold nanoparticles (AuNPs) through environmentally friendly technology using plant extracts: cactus (Opuntia sp.), onion (Allum sp.), pear (Pyrus sp.), coffee (Coffea sp.) and laurel (Laurus sp.), as a reducing agent and stabilizers. The methodology consists in merging Turkevich et al., 1951 and Rico-Moctezuma et al., 2010 techniques. The characterization with UV-Visible spectrophotometry determined maximum absorbance at 527-537 nm, corresponding with previously reported AuNPs absorbance, while transmission electron microscopy (TEM) and Atomic Force Microscopy (AFM) confirmed that the gold nanoparticles biosynthesis produced different shapes, including spheres, cubes, cones, cylinders and others with a size of 5-100 nm depending on the extract used, so that the proposed method is useful, eco-friendly, quick and inexpensive to synthesize AuNPs. Furthermore these AuNPs can be functionalized.
The composition effect on the thermal and optical properties across CdZnTe crystals K Strzakowski... more The composition effect on the thermal and optical properties across CdZnTe crystals K Strzakowski-Thermal analysis of PNIPAAm-PAAm mixtures via photopyroelectric technique G Akin Evingur, P Menon, R Rajesh et al.-This content was downloaded from IP address 177.225.40.21 on 27/02 Abstract. Since the first methodology, proposed by Turkevich, to produce gold nanoparticles (AuNPs), improvements have been made as to allow better controllability in their size and shape. These two parameters play important role for application of gold nanoparticles since they determine their optical and thermal properties. Two photopyroelectric techniques for the measurement of the thermal diffusivity and the optical absorption coefficient for nano-particles are introduced. These thermo-physical properties were measured for the colloidal systems at different nano-particle´s sizes and, for optical properties, at three different wavelengths (405 nm, 488 nm and 532 nm). No significant difference, on thermal properties, was found in the range of nano-particles` sizes studied in this work; in opposition optical properties shown more sensitive to this parameter.
Evaluation of Drosophila chromosomal segments proposed by means of simulations of possessing hybrid sterility genes from reproductive isolation, 2020
In heterozygote state, we introgressed three chromosomal segments of Drosophila koepferae in D. b... more In heterozygote state, we introgressed three chromosomal segments of Drosophila koepferae in D. buzzatii. The effect of each introgression was evaluated in the fertility of the segmental males, quantifying the amount of offspring produced. Through specific crosses method, we generated Drosophila segmental isolines carrying specific chromosomal introgression segments. The introgressions were monitored cytogenetically by the method of molecular markers of chromosomal asynapsis. The statistical analysis showed that none of the three segments evaluated, introgressed individually or in pairs, as well as cis or trans, do not produce sterility in the segmental males, as determined by the normal productions of offspring. Additional introgressions using other larger segments show that when the introgressions reach a minimum size of 31.15%, they produce sterility. It is concluded that the hybrid sterility genes present in the three segments evaluated did not act in strong epistasis, but show a pattern of gradual additive behavior by requiring a minimum threshold size to produce sterility. Finally, we also isolated the smallest introgressing segment that has been reported for these species (2.19%), and for the first time we have managed to place it in the homozygous state (data not are shown), so we are now in the process of evaluating the ability to these segments in the homozygous state.
There is a huge generation of residual hydrocarbons resulting from the use of fossil fuels, which... more There is a huge generation of residual hydrocarbons resulting from the use of fossil fuels, which adversely affect organisms and ecosystems. The automotive wasted lubricating oil represents one of the most recalcitrant pollutants because its long persistence and slow degradation. That is why it is very important to carry out studies to assess the toxicity of this residue. In this work the response of two plant species, Vicia faba and Phaseolus coccineus, was evaluated during its growth in contamined soil with automotive wasted oil. The monitoring of temperature, pH and humidity of substrate was done along the growth process in both species. A higher percentage of germination was observed in seedlings of P. coccineus (78 %). The variables that determine toxicity in plants (height, stem thickness, root length, root volume and concentration of chlorophyll) show significant differences between soil contamined with wasted oil and the control soil (p ≤ 0.05). The correlation analysis showed that the most related variables were height-root length (R2 = 0.74) and root length-root volume (R2 = 0.85). The species that has greater tolerance to the hydrocarbon concentrations was P. coccineus. It was also possible to note that the prior treatment of composting in both soils is not sufficient to inhibit the toxicity of the wasted oil to grow V. faba and P. coccineus.
Aerobiological study in the Mexico City subway system, 2014
Monitoring campaigns in two different seasons were carried out at two underground stations (Tacub... more Monitoring campaigns in two different seasons were carried out at two underground stations (Tacubaya and Azcapotzalco) of the subway of Mexico City, in order to assess airborne bacterial and fungi concentrations, as well as their relationship with several factors, such as depth of the station, sampling site, temperature, and relative humidity. Sixteen sampling sites were selected according to the depth of the lines and the transit of passengers in the corridors, concourses, and platforms. In addition, samples were also collected in the carriages when they were in movement. Outdoor samples were taken at the two stations for comparison. Two-stage multi-orifice cascade impactors were used to collect aero-biological particles, and with the aid of macroscopic and microscopic characterization were found 57 fungi and 61 bacteria colonies. Outdoor bacteria concentrations ranged from 1 to 68 CFU m-3 , while fungi concentrations varied from 6 to 80 CFU m-3. The indoor concentration levels of bacteria and fungi ranged from 1 to 484 CFU m-3 and from 51 to 715 CFU m-3 , respectively. Fungi and bacteria indoor concentrations in the subway were higher than outdoor, up to 8 times. Most of bacteria were identified as Gram-positive nonsporulating short bacillus, while the most abundant fungi genera identified were Aspergillus, Penicillium, and Alternaria in that order of frequency. Statistical analysis showed significant differences between the stations and the lines of different depths, showing a greater microorganisms' concentration with a greater depth. Although bacteria and fungi concentrations were higher in the spring than in winter, this difference was not significant. Even if indoor microbiological pollution in underground stations was higher than outdoor, the concentrations found in this study were lower than indoor air international standards.
LARGE GENETIC DISTANCES AMONG AEDES AEGYPTI POPULATIONS ALONG THE SOUTH PACIFIC COAST OF MEXICO, 2002
A population genetic analysis was conducted among 20 Aedes aegypti collections from 19 cities alo... more A population genetic analysis was conducted among 20 Aedes aegypti collections from 19 cities along the south Pacific coast in the Mexican states of Guerrero, Oaxaca, and Chiapas and in Coatepeque, Guatemala. Genetic variation was scored at 131 random amplified polymorphic DNA loci. The amount of genetic differentiation among collections was ∼3 times as great as detected among collections in an earlier study in northeastern Mexico. Regression analysis of linear or road distances on linearized F ST indicated that collections are genetically isolated by distance. Cluster analysis failed to group collections in geographic proximity, and there was as much genetic variation among collections 60 km apart as there was among all collections (∼900-km range). The large genetic differentiation in southern Mexico reflects reduced gene flow among mosquitoes arising in a greater diversity of habitats and altitudes than exists among northeastern collections. It is likely that dispersal via human commerce in the northeast confounds patterns of natural gene flow.
ABSTRACT Abstract: Monitoring campaigns in two different seasons were carried out at two undergro... more ABSTRACT Abstract: Monitoring campaigns in two different seasons were carried out at two underground stations (Tacubaya and Azcapotzalco) of the subway of Mexico City, in order to assess airborne bacterial and fungi concentrations, as well as their relationship with several factors, such as depth of the station, sampling site, temperature, and relative humidity. Sixteen sampling sites were selected according to the depth of the lines and the transit of passengers in the corridors, concourses, and platforms. In addition, samples were also collected in the carriages when they were in movement. Outdoor samples were taken at the two stations for comparison. Two-stage multiorifice cascade impactors were used to collect aerobiological particles, and with the aid of macroscopicand microscopic characterization were found 57 fungi and 61 bacteria colonies. Outdoor bacteria concentrations ranged from 1 to 68 CFU m-3, while fungi concentrations varied from 6 to 80 CFU m-3. The indoor concentration levels of bacteria and fungi ranged from 1 to 484 CFU m-3 and from 51 to 715 CFU m-3, respectively. Fungi and bacteria indoor concentrations in the subway were higher than outdoor, up to 8 times. Most of bacteria were identified as Gram-positive nonsporulating short bacillus, while the most abundant fungi genera identified were Aspergillus, Penicillium, and Alternaria in that order of frequency. statistical analysis showed significant differences between the stations and the lines of different depths, showing a greater microorganisms’ concentration with a greater depth. Although bacteria and fungi concentrations were higher in the spring than in winter, this difference was not significant. Even if indoor microbiological pollution in underground stations was higher than outdoor, the concentrations found in this study were lower than indoor air international standards.
Here, we present for the first time, a method to generate homozygous segmental introgressions, by... more Here, we present for the first time, a method to generate homozygous segmental introgressions, by means of crosses between a pair of synmorphic species. The introgressions were monitored by the cytogenetic method of polygenic chromosome asynapses. Later the introgressions were evaluated in their capacity to produce sterility in segmental males. Also, the smallest segment with the capacity to produce sterility in segmental males was mapped by in situ hybridization of polythene chromosomes, using 8 sequences of BACs clones as probes. Finally, a bioinformatic analysis was carried out to identify the presence of particular genes. From 2 parental strains, D. buzzatii and D. koepferae, 6 simple segmental hybrid lines were generated, whose introgressing segments are distributed along chromosome 4 of these species. From the 6 simple segmental lines and by means of a new crossing strategy, the 6 respective homozygous segmental hybrid offspring were obtained, each of them carrying a specific ...
The pick in the use of noble metal nanoparticles (NPs) in various fields has resulted in inorgani... more The pick in the use of noble metal nanoparticles (NPs) in various fields has resulted in inorganic synthesis of metal NPs, however the methodologies used for their preparation are generally expensive and involve the use of hazardous chemicals, is why has recently increased the development of sustainable and environmentally friendly alternatives. Synthesize biologically AuNPs is easy, inexpensive and is less damaging to the environment. The use of plant extracts for the synthesis of nanomaterials has not yet been fully explored, however represents a good alternative as well as the aforementioned advantages are obtained stable NPs of different size and shape. In this work the synthesis and characterization of AuNPs wasnperformed, and their functionalization with specific DNA probes of two microorganisms of environmental interest Achlya sp. and Escherichia coli (E. coli). Achlya sp. is a fungus that infects fish farms, aquariums and natural reservoirs; E coli is a bacteria pathogenic t...
Mundo Nano. Revista Interdisciplinaria en Nanociencias y Nanotecnología
Metallic nanoparticles (NPs) are being used mainly because they have excellent physical, chemical... more Metallic nanoparticles (NPs) are being used mainly because they have excellent physical, chemical and biological properties, intrinsic to their size, therefore there is a boom in the use of these nanoparticles in various fields and recently, due to the pandemic about coronavirus. Copper NPs began to be used for use in medical supplies such as face masks. NPs are normally obtained through inorganic synthesis, however, the methodologies used to obtain them are in general terms expensive and involve the use of hazardous chemicals, which has increased the development of sustainable and environmentally friendly alternatives, as one of the main objectives of nanotechnology. Considering that nanoparticle biosynthesis is of greatest importance since it allowed obtaining organic NPs through an environmentally friendly; quick and inexpensive. In this work, the synthesis and characterization of AuNPs of six different plant extracts that in traditional medicine are used for respiratory diseases...
Int. J. Biomedical Nanoscience and Nanotechnology, 2020
The synthesis of metallic nanoparticles (NPs) is currently performed through the development of m... more The synthesis of metallic nanoparticles (NPs) is currently performed through the development of methodologies using microorganisms, plant extracts, and even organic waste, seeking to mitigate the impact on the environment. However, for both synthesis and biosynthesis, it is necessary to consider physical and chemical factors such as temperature, stirring and pH, that allow controlling size and shape in an accurate way, as size and shape play an important role in the optical, electronic and thermal properties and determine many features of the structure and activity of molecules and biomolecules. In this work, we carry out chemical synthesis and biosynthesis of AuNPs at acidic (3-6), neutral (7) and basic (9) pH; the process is fast, simple and eco-friendly. We obtained AuNPs from 5-100 nm and determined that the pH of the solution is a key factor in the distribution and shape of the nanoparticles. Uniform AuNPs were obtained at neutral pH, or values of pH near neutrality. In addition, they have potential applications in various fields, due to their optical, magnetic, catalytic and electrical properties.
Journal of Nanomaterials & Molecular Nanotechnology, 2016
This work, conducted biological synthesis and characterization of gold nanoparticles (AuNPs) thro... more This work, conducted biological synthesis and characterization of gold nanoparticles (AuNPs) through environmentally friendly technology using plant extracts: cactus (Opuntia sp.), onion (Allum sp.), pear (Pyrus sp.), coffee (Coffea sp.) and laurel (Laurus sp.), as a reducing agent and stabilizers. The methodology consists in merging Turkevich et al., 1951 and Rico-Moctezuma et al., 2010 techniques. The characterization with UV-Visible spectrophotometry determined maximum absorbance at 527-537 nm, corresponding with previously reported AuNPs absorbance, while transmission electron microscopy (TEM) and Atomic Force Microscopy (AFM) confirmed that the gold nanoparticles biosynthesis produced different shapes, including spheres, cubes, cones, cylinders and others with a size of 5-100 nm depending on the extract used, so that the proposed method is useful, eco-friendly, quick and inexpensive to synthesize AuNPs. Furthermore these AuNPs can be functionalized.
The composition effect on the thermal and optical properties across CdZnTe crystals K Strzakowski... more The composition effect on the thermal and optical properties across CdZnTe crystals K Strzakowski-Thermal analysis of PNIPAAm-PAAm mixtures via photopyroelectric technique G Akin Evingur, P Menon, R Rajesh et al.-This content was downloaded from IP address 177.225.40.21 on 27/02 Abstract. Since the first methodology, proposed by Turkevich, to produce gold nanoparticles (AuNPs), improvements have been made as to allow better controllability in their size and shape. These two parameters play important role for application of gold nanoparticles since they determine their optical and thermal properties. Two photopyroelectric techniques for the measurement of the thermal diffusivity and the optical absorption coefficient for nano-particles are introduced. These thermo-physical properties were measured for the colloidal systems at different nano-particle´s sizes and, for optical properties, at three different wavelengths (405 nm, 488 nm and 532 nm). No significant difference, on thermal properties, was found in the range of nano-particles` sizes studied in this work; in opposition optical properties shown more sensitive to this parameter.
Evaluation of Drosophila chromosomal segments proposed by means of simulations of possessing hybrid sterility genes from reproductive isolation, 2020
In heterozygote state, we introgressed three chromosomal segments of Drosophila koepferae in D. b... more In heterozygote state, we introgressed three chromosomal segments of Drosophila koepferae in D. buzzatii. The effect of each introgression was evaluated in the fertility of the segmental males, quantifying the amount of offspring produced. Through specific crosses method, we generated Drosophila segmental isolines carrying specific chromosomal introgression segments. The introgressions were monitored cytogenetically by the method of molecular markers of chromosomal asynapsis. The statistical analysis showed that none of the three segments evaluated, introgressed individually or in pairs, as well as cis or trans, do not produce sterility in the segmental males, as determined by the normal productions of offspring. Additional introgressions using other larger segments show that when the introgressions reach a minimum size of 31.15%, they produce sterility. It is concluded that the hybrid sterility genes present in the three segments evaluated did not act in strong epistasis, but show a pattern of gradual additive behavior by requiring a minimum threshold size to produce sterility. Finally, we also isolated the smallest introgressing segment that has been reported for these species (2.19%), and for the first time we have managed to place it in the homozygous state (data not are shown), so we are now in the process of evaluating the ability to these segments in the homozygous state.
There is a huge generation of residual hydrocarbons resulting from the use of fossil fuels, which... more There is a huge generation of residual hydrocarbons resulting from the use of fossil fuels, which adversely affect organisms and ecosystems. The automotive wasted lubricating oil represents one of the most recalcitrant pollutants because its long persistence and slow degradation. That is why it is very important to carry out studies to assess the toxicity of this residue. In this work the response of two plant species, Vicia faba and Phaseolus coccineus, was evaluated during its growth in contamined soil with automotive wasted oil. The monitoring of temperature, pH and humidity of substrate was done along the growth process in both species. A higher percentage of germination was observed in seedlings of P. coccineus (78 %). The variables that determine toxicity in plants (height, stem thickness, root length, root volume and concentration of chlorophyll) show significant differences between soil contamined with wasted oil and the control soil (p ≤ 0.05). The correlation analysis showed that the most related variables were height-root length (R2 = 0.74) and root length-root volume (R2 = 0.85). The species that has greater tolerance to the hydrocarbon concentrations was P. coccineus. It was also possible to note that the prior treatment of composting in both soils is not sufficient to inhibit the toxicity of the wasted oil to grow V. faba and P. coccineus.
Aerobiological study in the Mexico City subway system, 2014
Monitoring campaigns in two different seasons were carried out at two underground stations (Tacub... more Monitoring campaigns in two different seasons were carried out at two underground stations (Tacubaya and Azcapotzalco) of the subway of Mexico City, in order to assess airborne bacterial and fungi concentrations, as well as their relationship with several factors, such as depth of the station, sampling site, temperature, and relative humidity. Sixteen sampling sites were selected according to the depth of the lines and the transit of passengers in the corridors, concourses, and platforms. In addition, samples were also collected in the carriages when they were in movement. Outdoor samples were taken at the two stations for comparison. Two-stage multi-orifice cascade impactors were used to collect aero-biological particles, and with the aid of macroscopic and microscopic characterization were found 57 fungi and 61 bacteria colonies. Outdoor bacteria concentrations ranged from 1 to 68 CFU m-3 , while fungi concentrations varied from 6 to 80 CFU m-3. The indoor concentration levels of bacteria and fungi ranged from 1 to 484 CFU m-3 and from 51 to 715 CFU m-3 , respectively. Fungi and bacteria indoor concentrations in the subway were higher than outdoor, up to 8 times. Most of bacteria were identified as Gram-positive nonsporulating short bacillus, while the most abundant fungi genera identified were Aspergillus, Penicillium, and Alternaria in that order of frequency. Statistical analysis showed significant differences between the stations and the lines of different depths, showing a greater microorganisms' concentration with a greater depth. Although bacteria and fungi concentrations were higher in the spring than in winter, this difference was not significant. Even if indoor microbiological pollution in underground stations was higher than outdoor, the concentrations found in this study were lower than indoor air international standards.
LARGE GENETIC DISTANCES AMONG AEDES AEGYPTI POPULATIONS ALONG THE SOUTH PACIFIC COAST OF MEXICO, 2002
A population genetic analysis was conducted among 20 Aedes aegypti collections from 19 cities alo... more A population genetic analysis was conducted among 20 Aedes aegypti collections from 19 cities along the south Pacific coast in the Mexican states of Guerrero, Oaxaca, and Chiapas and in Coatepeque, Guatemala. Genetic variation was scored at 131 random amplified polymorphic DNA loci. The amount of genetic differentiation among collections was ∼3 times as great as detected among collections in an earlier study in northeastern Mexico. Regression analysis of linear or road distances on linearized F ST indicated that collections are genetically isolated by distance. Cluster analysis failed to group collections in geographic proximity, and there was as much genetic variation among collections 60 km apart as there was among all collections (∼900-km range). The large genetic differentiation in southern Mexico reflects reduced gene flow among mosquitoes arising in a greater diversity of habitats and altitudes than exists among northeastern collections. It is likely that dispersal via human commerce in the northeast confounds patterns of natural gene flow.
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Papers by Francisco García-Franco
an important role in the optical, electronic and thermal properties and determine many features of the structure and activity of molecules and biomolecules. In this work, we carry out chemical synthesis and biosynthesis of AuNPs at acidic (3-6), neutral (7) and basic (9) pH; the process is fast, simple and eco-friendly. We obtained AuNPs from 5-100 nm and determined that the pH of the solution is a key factor in the distribution and shape of the nanoparticles. Uniform AuNPs were obtained at neutral pH, or values of pH near neutrality. In addition, they have potential applications in various fields, due to their optical,
magnetic, catalytic and electrical properties.
and slow degradation. That is why it is very important to carry out studies to assess
the toxicity of this residue. In this work the response of two plant species, Vicia faba
and Phaseolus coccineus, was evaluated during its growth in contamined soil with
automotive wasted oil. The monitoring of temperature, pH and humidity of substrate
was done along the growth process in both species. A higher percentage of germination
was observed in seedlings of P. coccineus (78 %). The variables that determine
toxicity in plants (height, stem thickness, root length, root volume and concentration
of chlorophyll) show significant differences between soil contamined with wasted oil
and the control soil (p ≤ 0.05). The correlation analysis showed that the most related
variables were height-root length (R2 = 0.74) and root length-root volume (R2 = 0.85).
The species that has greater tolerance to the hydrocarbon concentrations was P. coccineus.
It was also possible to note that the prior treatment of composting in both soils
is not sufficient to inhibit the toxicity of the wasted oil to grow V. faba and P. coccineus.
an important role in the optical, electronic and thermal properties and determine many features of the structure and activity of molecules and biomolecules. In this work, we carry out chemical synthesis and biosynthesis of AuNPs at acidic (3-6), neutral (7) and basic (9) pH; the process is fast, simple and eco-friendly. We obtained AuNPs from 5-100 nm and determined that the pH of the solution is a key factor in the distribution and shape of the nanoparticles. Uniform AuNPs were obtained at neutral pH, or values of pH near neutrality. In addition, they have potential applications in various fields, due to their optical,
magnetic, catalytic and electrical properties.
and slow degradation. That is why it is very important to carry out studies to assess
the toxicity of this residue. In this work the response of two plant species, Vicia faba
and Phaseolus coccineus, was evaluated during its growth in contamined soil with
automotive wasted oil. The monitoring of temperature, pH and humidity of substrate
was done along the growth process in both species. A higher percentage of germination
was observed in seedlings of P. coccineus (78 %). The variables that determine
toxicity in plants (height, stem thickness, root length, root volume and concentration
of chlorophyll) show significant differences between soil contamined with wasted oil
and the control soil (p ≤ 0.05). The correlation analysis showed that the most related
variables were height-root length (R2 = 0.74) and root length-root volume (R2 = 0.85).
The species that has greater tolerance to the hydrocarbon concentrations was P. coccineus.
It was also possible to note that the prior treatment of composting in both soils
is not sufficient to inhibit the toxicity of the wasted oil to grow V. faba and P. coccineus.