RESUMEN Drosophila melanogaster ha suscitado diversos estudios en la historia, la filosofía, la sociología y la didáctica de la biología, evidenciando el papel relevante que ha desempeñado como organismo modelo de prácticas experimentales de la genética y otras áreas. Sin embargo, dichos trabajos no suelen entrelazarse estrechamente. Por ende, este artículo pretende aportar en la constitución de vínculos entre esos ámbitos, entendiendo a esta mosca como un punto de convergencia. Desde esta perspectiva, se propone ampliar la mirada sobre la naturaleza de la ciencia, la cual es un referente importante para que los profesores puedan complejizar las prácticas de enseñanza de la biología. historia filosofía biología áreas embargo estrechamente ende ámbitos convergencia perspectiva ciencia

ABSTRACT Drosophila melanogaster has been the subject of several studies in history, philosophy, sociology, and teaching of biology, evidencing the relevant role it has played as a model organism for experimental practices in genetics and other areas. However, these works are not usually closely intertwined. Therefore, this article intends to contribute to the establishment of links between these areas, understanding the fly as a point of convergence. From this perspective, it proposes to broaden the view on the nature of science, which is an important reference for teachers to make biology teaching more complex. history philosophy sociology areas However intertwined Therefore convergence perspective science complex

Resumen: Se hace un abordaje teórico desde la etnografía interespecie, la que se complementa con la noción de especies fenomenológicas. Las relaciones interespecie se ilustran con el caso de cómo el dingo ha llegado a constituirse en una especie particular, pero que requiere de la interacción con otras. Dado que hay una amplia discusión acerca de si el dingo es un animal salvaje o doméstico (y si deviene de perros ferales), en la primera sección se expone, someramente, qué se entiende por domesticidad y feralidad en los perros. En la segunda se tratan aspectos generales del dingo, mientras que en la tercera se enfatiza en los vínculos entre humanos y dingos en clave cultural. En el cuarto y último apartado se plantean las consideraciones finales, en donde se extrapola lo sostenido acerca de la relación dingo-humano a un espectro más amplio y se puntualiza que devenir dingo implica, asimismo, devenir humano.

Abstract: We address a theoretical analysis within the framework of interspecies ethnography and complete it with the notion of phenomenological species. Interspecies relationships are illustrated in the case of how dingo dogs have become a particular species but a species needing interaction with others. As there is a big debate about dingoes being a wild or a tame animal (and if it comes from feral dogs), the first section briefly defines domesticity and ferality in dogs. The second deals with general aspects of dingoes, while the third one focuses on the cultural links between humans and dingoes. The fourth and last section presents the final considerations, extrapolating dingo-human relations to a broader spectrum and pointing out that becoming dingo implies becoming human.

Resumo: Propõe-se uma abordagem teórica desde a etnografia interespécie, que se complementa com a noção de espécies fenomenológicas. As relações interespécies se ilustram com o caso de como o dingo se transformou em uma espécie particular, mas que precisa das interações com outras. Visto que existe uma ampla discussão sobre se o dingo é um animal selvagem ou doméstico (e se devém de cães ferozes), na primeira parte apresenta-se, brevemente, o que se entende por domesticidade e ferocidade nos cães. Na segunda parte, tratam-se os aspetos gerais do dingo, enquanto na terceira parte salientam-se os laços entre humanos e dingos em perspectiva cultural. Na quarta parte, propõem-se as considerações finais, onde se extrapola o argumento sobre a relação dingo-humano em um horizonte mais amplo e se afirma que devir-dingo implica, do mesmo modo, devir-humano.

Pollution by pesticides has become relevant worldwide due to its serious effects on living organisms. Pesticides act as endocrine disrupters, affect the immune system, decrease the reproductive capacity and some are potentially carcinogenic for human beings. For the characteristicsmentioned, their high environmental persistence and bioacumulation potential in fat tissues,since 1970, some of the organochlorade pesticides have been restricted in many countries, and it is necessary their monitoring. In the Yucatan State, the predominant karstic nature of soil enables the infiltration of a wide range of substances to the underground hydric resources, polluting them. Particularly, it can be observed the north occidental state region, which is characterized by the presence of human settlements, agricultural activity and ground water flows oriented towards the north coast. The present study presents the results of a research carried outin the north occidental region of the Yucatan State (between the municipalities of Merida and Progreso) about the groundwater pollution by the presence of4,4´-DDT, 4,4´-DDD, 4,4´-DDE, lindane, endosulphan I and endosulphansulfate. The DDT concentrations and its derivatives as well as the endosulphan found in the area represent a risk for human water consumption, according to the mexican regulatory NOM-127-SSA1-1994.

La contaminación por plaguicidas ha tomado relevancia a nivel mundial por sus efectos sobre los organismos vivos ya que son disruptores endocrinos, afectan el sistema inmunológico, pueden disminuir la capacidad reproductiva, y algunos son potencialmente carcinogénicos para humanos. Por las características mencionadas, por su persistencia elevada en el medio ambiente y potencial de bioacumulación en tejidos grasos varios de los plaguicidas organoclorados han sido restringidos en muchos países desde 1970 y se hace necesario su monitoreo. En Yucatán la naturaleza cárstica predominante del suelo facilita la infiltración de múltiples sustancias a los recursos hídricos subterráneos afectándolos. Particularmente, se observa la región noroccidental del estado, la cual está caracterizado por la presencia de asentamientos humanos, actividad agrícola y por un flujo de agua subterránea orientado hacia la costa norte. El presente trabajo expone los resultados de una investigación realizada en la región noroccidental del estado, específicamente en la zona comprendida entre los municipios de Mérida a Progreso, acerca de la contaminación del agua subterránea por 4,4´-DDT, 4,4´-DDD, 4,4´-DDE y lindano así como de endosulfán I y sulfato de endosulfán. Las concentraciones de DDT y sus derivados así como de endosulfán halladas en la zona mencionada representan un riesgo para el agua de consumo humano de acuerdo a la NOM-127-SSA1-1994.

Chagas disease, which is caused by Trypanosoma cruzi, affects nearly 16 million people in Latin America and causes 75-90 million people to be at risk of infection. The disease is urbanizing and globalizing due to frequent migrations. There are regions of high prevalence of infection, including the north-eastern provinces of Argentina and the entire phytogeographic region known as the Gran Chaco. In the province of Chaco, Argentina, there are places inhabited by native populations such as the Wichi and Toba communities, among others. Many Creole populations resulting from miscegenation with European colonists and immigrants coexist within these communities. It has been widely accepted that in the chronic phase of the disease, between 25-30% of individuals develop some form of cardiac disease, with the right bundle-branch block being the most typical condition described so far. The aim of this work was to study the prevalence of Chagas infection and its electrocardiographic profile in the Wichi and Creole populations of Misión Nueva Pompeya, in the area known as Monte Impenetrable in Chaco, to determine the prevalence and the pattern of heart diseases produced by Chagas disease in this region.

Se descrevem 3 gestantes com a doença de Chagas aguda. Duas gestantes infetadas no 3º trimestre de gestação não tiveram crianças infetadas. O 3º filho, doquella madre foi infetada no 1º trimestre, nasceu com doença de Chagas congénita. Estes resultados inducem a investigação sobre os fatores de riscos da transmição e sobre as desições médicas na conducção dos casos de gestantes com a doença de Chagas aguda.

We studied three pregnant women with acute chagasic infection. Two patients, infected in the third trimester of pregnancy, had uninfected children. The third patient, infected earlier, had an infected newborn. These results encourage research on risk factors of transmission and on medical decisions concerning pregnant women with acute Chagas' disease.

An efficient methodology for the extraction and purification of mixtures of high molecular weight primary aliphatic alcohols, phytosterols and fatty acids from sugar cane mud is described, as well as the determination of the qualitative and quantitative composition of these mixtures.

Se describe una metodología eficiente para la extracción y purificación de mezclas de alcoholes alifáticos primarios de alto peso molecular, fitosteroles y ácidos grasos a partir de la cachaza de caña de azúcar, así como la determinación de la composición cuali y cuantitativa de dichas mezclas.