Conventional and commercially available DNA extraction methods have several limitations regarding... more Conventional and commercially available DNA extraction methods have several limitations regarding, for instance, contamination, and complex and slow precipitation and recovery processes. Herein, we report the synthesis of oxygen and phosphorus-doped Graphitic carbon nitride structures (g-POCN), via a novel Zinc-catalyzed one-pot solvothermal approach, and its application in the extraction of genomic DNA (gDNA) from a vegetal matrix (P. argentatum). Experimental and molecular modeling analyses demonstrate the high affinity of gDNA with g-POCN, which provided highly efficient gDNA extraction processes, with extraction yield, as well as integrity and quality of the extracted gDNA, comparable or superior to a commercial extraction kit and isopropanol extraction. Moreover, under suitable elution conditions, this method allows the easy removal of high concentrations of gDNA from g-POCN, rendering this method as a low-cost, simple, and fast approach for the extraction of even small amounts...
Polyaniline (PANI) composites have gained momentum as supercapacitive materials due to their high... more Polyaniline (PANI) composites have gained momentum as supercapacitive materials due to their high energy density and power density. However, some drawbacks in their performance remain, such as the low stability after hundreds of charge-discharge cycles and limitations in the synthesis scalability. Herein, we report for the first time PANI-Graphitic oxidized carbon nitride composites as potential supercapacitor material. The biomimetic polymerization of aniline assisted by hematin, supported by phosphorous and oxygen-modified carbon nitrides (g-POCN and g-OCN, respectively), achieved up to 89% yield. The obtained PAI/g-POCN and PANI/g-OCN show enhanced electrochemical properties, such as conductivity of up to 0.0375 S/cm, specific capacitances (Cs) of up to 294 F/g (at high current densities, 5 A/g) and a stable operation after 500 charge-discharge cycles (at 3 A/g). In contrast, the biomimetic synthesis of Free PANI, assisted by stabilized hematin in cosolvents, exhibited lower perf...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Here, we report the determination of acidity constants of eight amino amides through the use of N... more Here, we report the determination of acidity constants of eight amino amides through the use of Nuclear Magnetic Resonance (NMR) to carry out the selective crystallization of diprotonated (a), monoprotonated (b), and neutral species (c) derived from these compounds. Crystallographic studies of compounds 2 a, 6 a, 7 a, 8 a, 2 b, 3 b, 6 b and 2 c revealed that the presence of substituents at the C8 and C10 positions determines the conformation of the molecule regardless of its degree of protonation. Although diprotonated species (a) have the same conformation and similar hydrogen bonding patterns, the supramolecular structures of these compounds are different. Furthermore, chloride ions and solvent molecules play an outstanding role in stabilizing the supramolecular structure of these compounds. This phenomenon restricts the π⋅⋅⋅π interactions between benzimidazole groups and consequently limits the possibility of aggregation in amino amides 1–8.
documento ha sido preparado por el consultor de la División de Transporte y Comunicaciones, señor... more documento ha sido preparado por el consultor de la División de Transporte y Comunicaciones, señor Víctor M. Islas. Las opiniones aquí expresadas son de la exclusiva responsabilidad del autor y pueden no coincidir con las de la Organización. Este trabajo no ha sido sometido a revisión editorial.
Abstract After synthesis, specialty polymers can be difficult to purify from residual volatile mo... more Abstract After synthesis, specialty polymers can be difficult to purify from residual volatile monomers and solvents in a precise and reproducible manner using current standard separation techniques, which also generate large amounts of waste. Herein, we report a proof-of-principle study of a cost-effective and versatile method for separating residual volatile compounds from synthetic polymers via physisorption (i.e., polymer purification by physisorption (3P)). Model polymers were used to evaluate the capabilities and advantages of the 3P method over standard purification techniques regarding separation of volatile compounds, process solvent to polymer yield, and final properties of the resulting polymers. Compared to dialysis and precipitation, the 3P method could separate up to 99% of the residual monomer from a polymerization reaction using a significantly lower fraction of solvent. Unlike the benchmark methods, the molar mass and dispersity of polymers purified by the 3P process remain practically unaffected; polymers were quantitatively recovered for subsequent applications (e.g., precursors for block copolymer synthesis or characterization purposes). The 3P method represents a straightforward technique for polymer purification and is suitable for automation, which will help to overcome the unsolved and labor-intensive task of purifying (co-)polymer libraries derived from high-throughput experimentation.
Quasi-block copolymer design of quaternized derivatives of poly(2-(dimethylamino)ethyl methacryla... more Quasi-block copolymer design of quaternized derivatives of poly(2-(dimethylamino)ethyl methacrylate): Investigations on thermo-induced self-assembly
The relevance of intermolecular noncovalent Cl···Cu interactions in the magnetic and biological b... more The relevance of intermolecular noncovalent Cl···Cu interactions in the magnetic and biological behavior of copper complexes derived from amino amides is studied. Crystallography studies show that these complexes tend to stack, favoring noncovalent interactions (hydrogen bonding and Cu···Cl). However, the presence of substituents at the C10 and C13 positions regulates the supramolecular structures in 2. Thus, magnetic studies at 93, 293, and 353 K demonstrate that magnetic exchange is favored only by Cu–Cl···Cu interactions. Moreover, biological studies show that only those copper complexes with ferromagnetic behavior present cytotoxic activity. Natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) computations are used to corroborate the presence of the noncovalent interactions.
Este trabajo pretende explorar las condiciones y la lógica de los traslados que realizan los habi... more Este trabajo pretende explorar las condiciones y la lógica de los traslados que realizan los habitantes en el municipio de Chalco y realizar una primera comparación con las propias características del transporte en toda el Área Metropolitana dela Ciudadde México (AMCM). Así, se analizan las formas y problemas que enfrentan los habitantes para desplazarse y se describen las principales características del transporte existente en esa región. Pero más que ello, se trata de explicar por qué los habitantes aceptan condiciones tan difíciles para el traslado cotidiano y por qué, a pesar de ello, se sigue incrementando la cantidad de nuevos asentamientos en la zona.Una primer explicación radica en la combinación de dos factores: por una parte, el espíritu de sacrificio que los nuevos y jóvenes pobladores de Chalco muestran con el propósito de contar con vivienda propia y, por la otra, el relativo bajo costo de los terrenos. A lo anterior se agrega el hecho de que no todos los habitantes del...
Biotechnology is a set of techniques that involve the manipulation of living organisms to develop... more Biotechnology is a set of techniques that involve the manipulation of living organisms to develop processes and produce better products for the benefit of humanity. The new possibilities offered by the development of biotechnology have motivated the search of different applications in the industry. Currently, biotechnology is used to provide more efficient services, better products and to optimize processes. Today, biotechnology represents an alternative to satisfy the growing need of food in a sustainable way. The following diagram focuses on the applications of biotechnology in the field of food, pointing the benefits of biotechnological applications, such as the increase of nutritional value of food, as well as the possible disadvantages that could arise, as the monopolization of the food industry and possible health implications. Finally, current national and international regulation is presented.
Conventional and commercially available DNA extraction methods have several limitations regarding... more Conventional and commercially available DNA extraction methods have several limitations regarding, for instance, contamination, and complex and slow precipitation and recovery processes. Herein, we report the synthesis of oxygen and phosphorus-doped Graphitic carbon nitride structures (g-POCN), via a novel Zinc-catalyzed one-pot solvothermal approach, and its application in the extraction of genomic DNA (gDNA) from a vegetal matrix (P. argentatum). Experimental and molecular modeling analyses demonstrate the high affinity of gDNA with g-POCN, which provided highly efficient gDNA extraction processes, with extraction yield, as well as integrity and quality of the extracted gDNA, comparable or superior to a commercial extraction kit and isopropanol extraction. Moreover, under suitable elution conditions, this method allows the easy removal of high concentrations of gDNA from g-POCN, rendering this method as a low-cost, simple, and fast approach for the extraction of even small amounts...
Polyaniline (PANI) composites have gained momentum as supercapacitive materials due to their high... more Polyaniline (PANI) composites have gained momentum as supercapacitive materials due to their high energy density and power density. However, some drawbacks in their performance remain, such as the low stability after hundreds of charge-discharge cycles and limitations in the synthesis scalability. Herein, we report for the first time PANI-Graphitic oxidized carbon nitride composites as potential supercapacitor material. The biomimetic polymerization of aniline assisted by hematin, supported by phosphorous and oxygen-modified carbon nitrides (g-POCN and g-OCN, respectively), achieved up to 89% yield. The obtained PAI/g-POCN and PANI/g-OCN show enhanced electrochemical properties, such as conductivity of up to 0.0375 S/cm, specific capacitances (Cs) of up to 294 F/g (at high current densities, 5 A/g) and a stable operation after 500 charge-discharge cycles (at 3 A/g). In contrast, the biomimetic synthesis of Free PANI, assisted by stabilized hematin in cosolvents, exhibited lower perf...
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Here, we report the determination of acidity constants of eight amino amides through the use of N... more Here, we report the determination of acidity constants of eight amino amides through the use of Nuclear Magnetic Resonance (NMR) to carry out the selective crystallization of diprotonated (a), monoprotonated (b), and neutral species (c) derived from these compounds. Crystallographic studies of compounds 2 a, 6 a, 7 a, 8 a, 2 b, 3 b, 6 b and 2 c revealed that the presence of substituents at the C8 and C10 positions determines the conformation of the molecule regardless of its degree of protonation. Although diprotonated species (a) have the same conformation and similar hydrogen bonding patterns, the supramolecular structures of these compounds are different. Furthermore, chloride ions and solvent molecules play an outstanding role in stabilizing the supramolecular structure of these compounds. This phenomenon restricts the π⋅⋅⋅π interactions between benzimidazole groups and consequently limits the possibility of aggregation in amino amides 1–8.
documento ha sido preparado por el consultor de la División de Transporte y Comunicaciones, señor... more documento ha sido preparado por el consultor de la División de Transporte y Comunicaciones, señor Víctor M. Islas. Las opiniones aquí expresadas son de la exclusiva responsabilidad del autor y pueden no coincidir con las de la Organización. Este trabajo no ha sido sometido a revisión editorial.
Abstract After synthesis, specialty polymers can be difficult to purify from residual volatile mo... more Abstract After synthesis, specialty polymers can be difficult to purify from residual volatile monomers and solvents in a precise and reproducible manner using current standard separation techniques, which also generate large amounts of waste. Herein, we report a proof-of-principle study of a cost-effective and versatile method for separating residual volatile compounds from synthetic polymers via physisorption (i.e., polymer purification by physisorption (3P)). Model polymers were used to evaluate the capabilities and advantages of the 3P method over standard purification techniques regarding separation of volatile compounds, process solvent to polymer yield, and final properties of the resulting polymers. Compared to dialysis and precipitation, the 3P method could separate up to 99% of the residual monomer from a polymerization reaction using a significantly lower fraction of solvent. Unlike the benchmark methods, the molar mass and dispersity of polymers purified by the 3P process remain practically unaffected; polymers were quantitatively recovered for subsequent applications (e.g., precursors for block copolymer synthesis or characterization purposes). The 3P method represents a straightforward technique for polymer purification and is suitable for automation, which will help to overcome the unsolved and labor-intensive task of purifying (co-)polymer libraries derived from high-throughput experimentation.
Quasi-block copolymer design of quaternized derivatives of poly(2-(dimethylamino)ethyl methacryla... more Quasi-block copolymer design of quaternized derivatives of poly(2-(dimethylamino)ethyl methacrylate): Investigations on thermo-induced self-assembly
The relevance of intermolecular noncovalent Cl···Cu interactions in the magnetic and biological b... more The relevance of intermolecular noncovalent Cl···Cu interactions in the magnetic and biological behavior of copper complexes derived from amino amides is studied. Crystallography studies show that these complexes tend to stack, favoring noncovalent interactions (hydrogen bonding and Cu···Cl). However, the presence of substituents at the C10 and C13 positions regulates the supramolecular structures in 2. Thus, magnetic studies at 93, 293, and 353 K demonstrate that magnetic exchange is favored only by Cu–Cl···Cu interactions. Moreover, biological studies show that only those copper complexes with ferromagnetic behavior present cytotoxic activity. Natural bond orbital (NBO) and quantum theory of atoms in molecules (QTAIM) computations are used to corroborate the presence of the noncovalent interactions.
Este trabajo pretende explorar las condiciones y la lógica de los traslados que realizan los habi... more Este trabajo pretende explorar las condiciones y la lógica de los traslados que realizan los habitantes en el municipio de Chalco y realizar una primera comparación con las propias características del transporte en toda el Área Metropolitana dela Ciudadde México (AMCM). Así, se analizan las formas y problemas que enfrentan los habitantes para desplazarse y se describen las principales características del transporte existente en esa región. Pero más que ello, se trata de explicar por qué los habitantes aceptan condiciones tan difíciles para el traslado cotidiano y por qué, a pesar de ello, se sigue incrementando la cantidad de nuevos asentamientos en la zona.Una primer explicación radica en la combinación de dos factores: por una parte, el espíritu de sacrificio que los nuevos y jóvenes pobladores de Chalco muestran con el propósito de contar con vivienda propia y, por la otra, el relativo bajo costo de los terrenos. A lo anterior se agrega el hecho de que no todos los habitantes del...
Biotechnology is a set of techniques that involve the manipulation of living organisms to develop... more Biotechnology is a set of techniques that involve the manipulation of living organisms to develop processes and produce better products for the benefit of humanity. The new possibilities offered by the development of biotechnology have motivated the search of different applications in the industry. Currently, biotechnology is used to provide more efficient services, better products and to optimize processes. Today, biotechnology represents an alternative to satisfy the growing need of food in a sustainable way. The following diagram focuses on the applications of biotechnology in the field of food, pointing the benefits of biotechnological applications, such as the increase of nutritional value of food, as well as the possible disadvantages that could arise, as the monopolization of the food industry and possible health implications. Finally, current national and international regulation is presented.
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