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Now showing items 1-20 of 1393
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A rat mammary tumor model induced by the organophosphorous pesticides parathion and malathion, possibly through acetylcholinesterase inhibition
(US DEPT HEALTH HUMAN SCIENCES PUBLIC HEALTH SCIENCE, 2001)Environmental chemicals may be involved in the etiology of breast cancers. Many studies have addressed the association between cancer in humans and agricultural pesticide exposure. Organophosphorous pesticides have been ... -
Hydribization screening of very short PCR products for paleoepidemiological studies of Chagas' disease
(FUTURE SCI LTD, 2001)Single strands of very short PCR products can be covalently immobilized to a slide and then easily detected by probe hyhridization. In this work, the PCR product was a 70-nucleotide segment of ancient DNA, representing a ... -
The MAP kinases are differently utilized by CD28 and CD2 adhesion pathways in superantigen-activated Jurkat T cells
(SOC BIOLGIA CHILE, 2003)To mimic the two-signal requirements for T cell activation mediated by ligands, we exposed the superantigens SEA or SEE (signal 1) to T cells incubated with HLA-DR/LFA-3 or HLA-DR/137-1-CHO transfected cells (signal 2). ... -
Inca expansion and parasitism in the Lluta Valley: Preliminary data
(FUNDACO OSWALDO CRUZ, 2003)Assessing the impact of cultural change on parasitism has been a central goal in archaeoparasitology. The influence of civilization and the development of empires on parasitism has not been evaluated. Presented here is a ... -
Interaction energies in non Watson-Crick pairs: An ab initio study of G center dot U and U center dot U pairs
(SOC CHILENA QUIMICA, 2005)Ab initio calculations at the MP2/6-31G** level have been carried out on the non-Watson-Crick nucleic acids pairs G center dot U and U center dot U to obtain the interaction energies and to see whether the derived values ... -
Effect of malathion on the male reproductive organs of earthworms, Eisenia foetida
(WOLTERS KLUWER MEDKNOW PUBLICATIONS, 2005)Aim: To observe the cytotoxic effect of the organophosphate insecticide malathion in the reproductive tissues of the earthworms, Eisenia foetida. Methods: Worms were nourished in soil treated with malathion at single ... -
Geoglyphs and prehispanic Llama caravan traffic in the Atacama desert (Northern Chile)
(UNIV TARAPACA, 2005)This study brings new empirical evidence, resulting from the excavation of four transitory camp sites and two human burials associated with geoglyphs, and found along a prehispanic caravan path of 150 km long, connecting ... -
Low risk of attention deficit/hyperactivity disorder in Aymara children. Genetic, anthropological, and cultural implications
(UNIVERSIDAD TARAPACA, 2005)The distribution of scores or the Conners Scale which is used to diagnose attention deficit/hyperactivity disorder (ADHD) is studied in children of the Jose Abelardo Nunez school of San Miguel de Azapa, Arica, Chile with ... -
Arseniasis as an environmental hypothetical explanation for the origin of the oldest artificial mummification practice in the world
(UNIVERSIDAD TARAPACA, 2005)This essay explores the idea that arsenic poisoning was the impetus for the origin of the oldest mummification practice in the world. The Chinchorro people artificially mummified fetuses and infants starting 7000 years ... -
Role of the phosphatase PP4 in the activation of JNK-1 in prostate carcinoma cell lines PC-3 and LNCaP resulting in increased AP-1 and EGR-1 activity
(SOC BIOLGIA CHILE, 2005)The specific signaling connections between the mitogen-activated protein kinases (MAPK) such as c-Jun N-terminal kinase (JNK-1) and phosphatases PP4 and M3/6, affecting the family of early nuclear factors, is complex and ... -
Oxygen content and its diurnal variation in a new recirculanting water soilless culture for horticultural crops
(AMER SOC HORTICULTURAL SCIENCE, 2005)Based on a new structure for plastic culture channels, a new system for soilless culture called New Growing Systems (NGS) has been developed. It is similar to the nutrient film technique (NFT) but with several potential ... -
Caravans, rock art and ritualism in the Quebrada Suca (Northern Chile)
(UNIV TARAPACA, 2005)This work onalyses the strong and recognized rclationship between rock art and traffic routes witin the Atacama Desert. The model circuit tnobilit mobility is analyzed and in addition Andean ritualism is considered. We ... -
Aspects of ingestion transmission of chagas disease identified in mummies and their coprolites
(UNIV TARAPACA, 2005)Molecular study of Trypanosoma cruzi (T. cruzi) anciant DNA (aDNA) in the soft (nonskeletal) tissues of 283 naturally (spontaneously) mummified bodies from coastal sites located in southern Peru and northern Chile demonstrated ... -
Peripherical and core areas. Contexts for complex and multidirectional social interactions
(UNIV TARAPACA, 2006)We believe that social interactions between core cultural areas, large scale political systems, and semi-peripheral, peripheral, and ultra-peripheral zones were more complex than previously thought, and that they cannot ... -
The ancient inhabitants of the Salar de Atacama, Atacaman prehistory
(UNIVERSIDAD TARAPACA, 2007) -
Gene and protein expressions induced by 17 beta-estradiol and parathion in cultured breast epithelial cells
(SPRINGER, 2007)Cancer of the breast is the most common form of malignant disease occurring among women of the western world and environmental substances seem to be involved in the etiology of this disease. Many studies have found an ... -
Superlinear equations involving nonlinearities limited by asymptotically homogeneous functions
(SPRINGEROPEN, 2007)We obtain a solution of the quasilinear equation - Delta(p)u = f (u) in Omega, u = 0, on partial derivative Omega. Here the nonlinearity f is superlinear at zero, and it is located near infinity between two functions that ... -
Genetic variation and population structure in Native Americans
(PUBLIC LIBRARY SCIENCE, 2007)We examined genetic diversity and population structure in the American landmass using 678 autosomal microsatellite markers genotyped in 422 individuals representing 24 Native American populations sampled from North, Central, ... -
Electrochemical reduction of nitrite at polymeric Co(II)-tetra-3-amino-phenyl-porphyrin modified electrode
(SOC CHILENA QUIMICA, 2007)This paper describes the electrochemical reduction of nitrite ion in basic media 0.2M KHCO3, with glassy carbon or ITO electrodes modified with a conducting polymer derived from Co(II)tetra-3-aminophenyl-porphyrin. Cyclic ... -
Existence and multiplicity results for degenerate elliptic equations with dependence on the gradient
(SPRINGER INTERNATIONAL PUBLISHING AG, 2007)We study the existence of positive solutions for a class of degenerate nonlinear elliptic equations with gradient dependence. For this purpose, we combine a blowup argument, the strong maximum principle, and Liouville-type ...