Browsing by Author "Barraza, Francisco"

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    Relationship between Wildfire Smoke and Children’s Respiratory Health in the Metropolitan Cities of Central-Chile
    (2022) Ciciretti, Rebecca; Barraza, Francisco; Barrera, Francisco de la; Urquieta, Lorna; Cortés, Sandra; CEDEUS (Chile)
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    Source apportionment of ambient PM2.5 in Santiago, Chile: 1999 and 2004 results
    (ELSEVIER SCIENCE BV, 2012) Jorquera, Hector; Barraza, Francisco
    A receptor model analysis has been applied to ambient PM2.5 measurements taken at Santiago, Chile (33.5 degrees S, 70.7 degrees W) in 2004 (117 samples) and in 1999 (95 samples) on a receptor site on the eastern side of the city. For both campaigns, six sources have been identified at Santiago and their contributions in 1999/2004 are: motor vehicles: 28 +/- 2.5/31.2 +/- 3.4%, wood burning: 24.8 +/- 2.3/28.9 +/- 3.3%, sulfates: 18.8 +/- 1.7/16.2 +/- 2.5%, marine aerosol: 13 +/- 2.1/9.9 +/- 1.5%, copper smelters: 11.5 +/- 1.4/9.7 +/- 3.3% and soil dust: 3.9 +/- 1.5/4.0 +/- 2.4%. Hence relative contributions are statistically the same but the absolute contributions have been reduced because ambient PM2.5 has decreased from 34.2 to 25.1 mu g/m(3) between 1999 and 2004 at Santiago. Similarity of results for both data sets - analyzed with different techniques at different laboratory facilities - shows that the analysis performed here is robust.
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    Traditional ethnobotanical knowledge and use of medicinal plants in a rural area of the metropolitan region of Chile: descriptive study
    (2014) Barraza, Francisco; Calvo, Carlos; Silva, Mauricio; Vinet, Raul; Laurido, Claudio; Barrera, Elizabeth; Meza, Ines; Vargas-Rueda, Silvia; Martinez, Jose L.
    In order to characterize and evaluate the botanical knowledge belonging to the population in rural area (little addressed by the ethnobotany) a study was conducted through surveys to learn about medicinal plants cultivated and used and a rural area of the Metropolitan Region (San Juan de Pirque). The conclusions are that users have a hybrid knowledge (product of traditional knowledge combined with information of various kinds) of medicinal plants. We found that most of the species cultivated in botanical gardens were species introduced and very few native ones. Also, they were known by their common names and new names were detected not described previously in the literature.