Maria Elena Martinez's "Genealogical Fictions" is the first in-depth study of the relationship between the Spanish concept of "limpieza de sangre" (purity of blood) and colonial Mexico's "sistema de castas," a hierarchical system of social classification based primarily on ancestry. Specifically, it explains how this notion surfaced amid socio-religious tensions in early modern Spain, and was initially used against Jewish and Muslim converts to Christianity. It was then transplanted to the Americas, adapted to colonial conditions, and employed to create and reproduce identity categories according to descent. Martinez also examines how the state, church, Inquisition, and other institutions in colonial Mexico used the notion of purity of blood over time, arguing that the concept's enduring religious, genealogical, and gendered meanings and the archival practices it promoted came to shape the region's patriotic and racial ideologies.

Despite deepening poverty and environmental degradation throughout rural Latin America, Mayan peasant farmers in Chiapas, Mexico, are creating an environmental and economic success by growing organic coffee. Organic Coffee: Sustainable Development by Mayan Farmers provides a unique and vivid insight into how this coffee is grown, harvested, processed, and marketed to consumers in the North. Maria Elena Martinez-Torres explains how Mayan farmers have capitalized on their ethnic networks to make a crucial difference in their approach to agriculture. Taking us inside Chiapas, Mexico's poorest state, scene of the 1994 Zapatista uprising, she examines the anatomy of the on-going organic coffee boom and the efffects of the free-trade movement. The energy behind this phenomenon arises from very poor farmers forming cooperatives, revaluing their ethnic identity, and adding value to their land through organic farming. The result has been significant economic benefits for their families and ecological benefits for the future sustainability of agriculture in the region. Martinez-Torres explodes the myth that organic farming is less productive than chemical-based agriculture, and gives us reasons to be hopeful for indigenous peoples and peasant farmers. Organic Coffee ultimately shows how sustainable agriculture at the production end can make the coffee commodity chain into a tool for bettering lives and ecologies in poor regions of the world. ABOUT THE AUTHOR---Maria Elena Martinez-Torres is from Mexico and is Global Alternatives Associate at the Center for the Study of the Americas (CENSA) in Berkeley, California. She is director of Desarrollo Alternativo, AC, a non-profit organization in Mexicothat works towards alternative, sustainable development practices.

La condicion electrica del cuerpo humano es hoy conocida y aceptada en muchas de sus aplicaciones. Las senales electricas son consideradas fundamentales para diagnostico de patologias cardiacas, cerebrales y musculares, ademas del uso del biomagnetismo en tecnicas como las imagenes de resonancia magnetica y el uso de nanoparticulas magneticas como marcadores para diagnostico y tratamiento en ingenieria de tejidos y administracion de farmacos. En este manuscrito se presenta un poco de historia sobre el nacimiento y renacimiento de la electricidad y el magnetismo como una aplicacion en el area medica. Los fundamentos teoricos que soportan el porque de la interaccion entre el electromagnetismo y el tejido y su dificultad a la hora de predecir dicha interaccion. Se presentan las caracteristicas electricas de los tejidos reflejadas en sus propiedades y cambios ante diferentes condiciones de frecuencia, temperatura, edad, patologias, etc. Y finalmente se recopilan estudios de la aplicacion de electricidad y magnetismo en el diagnostico y tratamiento del tejido oseo y la piel, que no son aun completamente aceptados pero que evidencian y motivan a investigar en el area del bioelectromagnetismo."