Major element compositions, minerals and trace elements at DSDP Leg 67 Holes

Mineralogical (microprobe) and geochemical (X-ray fluorescence, neutron activation analyses) data are given for 18 samples of volcanic rocks from the Guatemala Trench area (Deep Sea Drilling Project Leg 67). Typical fresh oceanic tholeiites occur in the trench itself (Hole 500) and in its immediate vicinity on the Cocos Plate (Site 495). Several samples (often reworked) of "spilitic" oceanic tholeiites are also described from the Trench: their mineralogy (greenschist facies association - actinolite + plagioclase + chlorite) and geochemistry (alteration, sometimes linked to manganese and zinc mineralization) are shown to result from high-temperature (300°-475°C) hydrothermal sea water-basalt interactions. The samples studied are depleted in light rare-earth elements (LREE), with the exception of the slightly LREE-enriched basalts from Hole 500. The occurrence of such different oceanic tholeiites in the same area is problematic. Volcanic rocks from the Guatemala continental slope (Hole 494A) are described as greenschist facies metabasites (actinolite + epidote + chlorite + plagioclase + calcite + quartz), mineralogically different from the spilites exposed on the Costa Rica coastal range (Nicoya Peninsula). Their primary magmatic affinity is uncertain: clinopyroxene and plagioclase compositions, together with titanium and other hygromagmaphile element contents, support an "active margin" affinity. The LREE-depleted patterns encountered in the present case, however, are not frequently found in orogenic samples but are typical of many oceanic tholeiites.

Cooperative or collaborative learning: Is there a difference in university students’ perceptions?

The hypothesis that the same educational objective, raised as cooperative or collaborative learning in university teaching does not affect students’ perceptions of the learning model, leads this study. It analyses the reflections of two students groups of engineering that shared the same educational goals implemented through two different methodological active learning strategies: Simulation as cooperative learning strategy and Problem-based Learning as a collaborative one. The different number of participants per group (eighty-five and sixty-five, respectively) as well as the use of two active learning strategies, either collaborative or cooperative, did not show differences in the results from a qualitative perspective.

Being impolite while pretending to be polite. The rupture of politeness conventions in electoral debates

This paper is a part of a larger research that pursues a global understanding of impoliteness in face-to-face electoral debates. That research distinguishes three essential axes, three complementary analytical perspectives: functional strategies of impoliteness, linguistic-discursive mechanisms to implement them and social impacts of impolite acts. In this frame, the present work develops an in-depth analysis of a special category of mechanisms, namely the rupture of politeness conventions, a subgroup within postliteral implicit mechanisms. This subgroup acquires its identity by the fact of carrying out a linguistic action that is conventionally associated with a polite attitude, but doing it in a rhetorically insincere way: the consequence is that apparent politeness becomes impoliteness. Relevant aspects in the characterization of ruptures are isolated and, on this basis, it is developed a detailed analysis of three specific kinds of mechanisms in which ruptures take shape: using ironic statements, developing different forms of overpoliteness and adopting a falsely collaborative attitude toward the interlocutor. The analysis of that group of mechanisms takes into account, simultaneously, the other two axes of the main research, strategies and social impacts.

Descosiendo géneros : Canotaje, kayakismo, grupalidad y diversidad en el Centro de Educación Física Nº 67 de Berisso

Este escrito desea "navegar" en la construcción del canotaje y kayakismo en el CEF Nº 67 de Berisso, como una de las extensiones del mismo, pero que tiene la particularidad de ser junto a la gimnasia deportiva y la vida en la naturaleza, las extensiones fundadoras de nuestro CEF de Berisso, allá por el año 1998. Durante más de un cuarto de siglo, la sociedad y la ciudad de Berisso fue cambiandoy en particular la actividad de canotaje y Kayakismo en su organización dentro del CEF 67, la cual fue atravesada por la perspectiva de géneros. Reflexionemos desde esta mirada la enseñanza del kayakismo y el canotaje situándolo desde la diversidad y la apropiación de los cuerpos, que se conciben e inventan al elegir esta actividad recreativa o deporte en su origen, donde se recrean los sentidos y significados sobre la misma

Ki-67 Proliferation Index in Gastric Cancer - Biologic Significance

Objectives/Introdution: Ki-67 protein has been used as an indicator of proliferation activity in tumor cells. In gastric cancer the prognostic value has not been fully understood. This study was designed to assess the biologic significance of Ki-67 proliferation index (PI) in gastric cancer. Material/Methods: Seventy-two patients with gastric cancer were evaluated. These patients underwent gastric resection, and the tumor tissue was stained immunohistochemically. Ki-67 PI was defined as the percentage of tumor cells positive for Ki-67. Ki-67 PI was correlated with clinicopathological characteristics and patient survival. Results: A low Ki-67 PI (less than or equal to 50%) was associated with poorly differentiated histology - diffuse type (p=0.009) and signet ring cells (p=0.004) - and younger age (p=0.022). A worse prognosis in patients with low Ki-67 PI was also found (a mean survival of 41.8 vs 63 months for high Ki-67 PI group), but not statistically significant (p=0.623, log rank test). Discussion/Conclusion: We found an inversely correlation between Ki-67 PI and histological differentiation grade. Patients in group with low Ki-67 PI are younger, with poorly differentiated histology and have a lower mean survival. Like other studies already suggested, we may have two different tumors phenotypes - highly invasive with low proliferative capability, and less invasive potential with higher proliferative ability. However, in this sample, no significant prognostic value was achieved between both.

Water Summary Update, August 19, 2016, No. 67

A snapshot of water resource trends prepared by the Iowa DNR in collaboration with the Iowa Department of Agriculture and Land Stewardship, the U.S. Geological Survey, and The Iowa Homeland Security and Emergency Management Department.

Patología biliar en el hospital San Vicente de Paúl: revisión estadística añós 67-71

Doctor en Medicina y Cirugía