High-speed counter-current chromatography (HSCCC) was successfully used for the isolation and purification of coumarin compounds from Cortex fraxinus, the Chinese herbal drug. n-Butanol-methanol-0.5% acetic acid (5:1.5:5, v/v) was used as the two-phase solvent system. 14.3 mg of fraxin, 26.5 mg of aesculin, 5.8 mg of fraxetin and 32.4 mg of aesculetin with the purity of 97.6, 99.5, 97.2 and 98....

The concentration of pollen grains in the atmosphere over the metropolitan area of Monterrey, Nuevo Leon, Mexico, was analyzed throughout a year from March 2003-February 2004, focused on the genus Carya, Celtis, Cupressus, Fraxinus and Pinus owing to their interest as etiological pollinosis agents in diverse regions of the world. A 7-day Hirst type volumetric spore and pollen trap was located o...

En enero de 1592, Luis Velasco, virrey la Nueva España, solicitó al Ayuntamiento Ciudad México construcción un lugar que sirviera para el recreo y esparcimiento los habitantes capital del virreinato. seguimiento a dicha petición, se seleccionó sitio poniente ciudad denominó Alameda Central en abril mismo año plantaron alrededor mil árboles las especies Populus alba, P. nigra Alnus sp. La cumpli...

Introducción y objetivos: La contaminación ambiental podría afectar el estado sanitario del arbolado a la biodiversidad de microorganismos. Fraxinus pennsylvanica es uno los árboles más frecuentes en Ciudad Buenos Aires. Los objetivos trabajo fueron: relevar micromicetes presentes corteza madera fresno, determinar si hallados con mayor frecuencia producen enzimas lignocelulolíticas, describir p...

Insect herbivores help maintain forest diversity through selective predation on seedlings of vulnerable tree species. Although the role of natural enemies has been well-studied in tropical systems, relatively few studies have experimentally manipulated insect abundance in temperate forests and tracked impacts over multiple years. We conducted a three-year experiment (2012-2014) deterring insect...

Baseball is a popular and very lucrative bat-and-ball sport that uses wooden bat to score runs. We hypothesize new design features for baseball bats will emerge from their shape optimization using parametric modeling genetic algorithms. converge the location of two points on made maple (Acer sp.) ash (Fraxinus wood are associated with increased velocity ball rebounding off bat: vibrational noda...