Síntesis de 2,8,14,20-tetra-n-butilpirogalol[4]areno y estudio computacional conformacional

This work presents the preparation of mesoporous aluminum silicates from condensation of xerogel obtained from Tetraethyl orthosilicate (TEOS) and other aluminum precursos from various sources. The reagents used were aluminum nitrate (NAN) as inorganic source and the inorganic-alkoxide, Aluminun tris-secbutilate (TBA) as organometallic source. The length of the alkyl chain was evaluated in regards to its influence upon the surface area and in the generation of mesopores in the materials. Additionally, the former parameters were studied to determine their effect on the hydrothermal stability of the aluminosilicates.Este trabajo presenta la obtención de aluminosilicatos mesoporosos generados mediante condensación de xerogel a partir de alcóxido de silicio (TEOS) y precursores de aluminio de diversas fuentes. Se usaron nitrato de aluminio (NAN), como fuente inorgánica y el alcoxido, tris-sec-butilato de aluminio (TBA) como fuente órgano-metálica. Se analizó la importancia del tamaño de cadena de alquilo en el surfactante (Tritón-X) en el proceso de condensación de la red, y su posterior influencia sobre el área superficial y en la obtención de mesoporos en los materiales. Adicionalmente se estudió la influencia de las variables mencionadas sobre la estabilidad hidrotermal de los aluminosilicatos

2,2,3,3′-Tetra­phenyl-7,7′-biquinoxaline

In the crystal structure of the title compound, C40H26N4, mol­ecules reside on crystallographic centers of inversion and are linked via C—H⋯N inter­actions about inversion centers into one-dimensional chains: longer C—H⋯π(arene) inter­actions complete the inter­molecular inter­actions

Newton's problem in the calculus of variations

Electronic Thesis or Dissertatio

Promoting Environmental Stewardship in Poudre School District\u27s Elementary Classrooms

Education is the most powerful tool at our disposal to help solve and prevent environmental problems. Environmental education aims to educate the whole child by empowering them with a solid foundation of knowledge while giving them the opportunity to build the skills needed to enhance their problem-solving abilities. This Capstone Project is an example of how school districts can enhance their existing science curriculum and develop an effective environmental education program by adhering to certain principles. Using Poudre School District science curriculum as the launching platform, this Capstone Project contains numerous lesson plans that allow teachers in elementary schools to implement an environmental education program and change their students\u27 attitude towards the environment while meeting their district mandated standards

\u3cem\u3eStaphylococcus aureus\u3c/em\u3e Isdc and Esxa Chimeric Vaccines to Prevent Bovine Mastitis

Bacterial resistance to antibiotics is fast becoming a losing battle. Human health is not the only concern, however. Meat and dairy industries are feeling financial, production, and ethical pressures to find alternatives to antibiotics. Vaccines are a promising solution to this issue. Staphylococcus aureus is a bacterium that causes bovine mastitis, an infection in the udders of cows. Our research focuses on the antigens, IsdC and EsxA found in bovine strains of Staphylococcus aureus. We hypothesize that immunity to S. aureus can be achieved through an intranasal vaccine comprised of these antigens and a cholera toxin A2/B (CTA2/B) chimera adjuvant. The antigens will be amplified using polymerase chain reaction, purified and, inserted into a vector expressing the CTA2/B subunits in E. coli. Once transformation of E. coli is confirmed, proteins will be induced and isolated using affinity chromatography to D-galactose and analyzed on SDS-PAGE. These proteins will later be incorporated into a multivalent vaccine to present S. aureus mastitis. The development of an effective, easy to administer, and affordable vaccine for bovine mastitis will decrease animal suffering, antibiotic use, and costs associated with S. aureus bovine mastitis. Additionally, our research findings will contribute the development of vaccines for human S. aureus infections