Search results for "COLUMN"

Los espacios públicos de la cotidianeidad / 3

2006

Los espacios públicos de la cotidianeidad / 4

2006

A comparison of HDFS compact data formats: Avro versus Parquet

2017

In this paper, file formats like Avro and Parquet are compared with text formats to evaluate the performance of the data queries. Different data query patterns have been evaluated. Cloudera’s open-source Apache Hadoop distribution CDH 5.4 has been chosen for the experiments presented in this article. The results show that compact data formats (Avro and Parquet) take up less storage space when compared with plain text data formats because of binary data format and compression advantage. Furthermore, data queries from the column based data format Parquet are faster when compared with text data formats and Avro. Article in English. HDFS glaustųjų duomenų formatų palyginimas: Avro prieš Parquet…

Tiempos de Cruzada

1998

La Europa de Blair / 1. La tercera vía

2005

“A Miracle of Architecture”: The Billiemi limestone Columns of the Church of San Giuseppe dei Teatini in Palermo and Domenico Fontana’s Method for Li…

2014

La chiesa di San Giuseppe dei Teatini di Palermo (costruita a partire dal 1619), è un’architettura singolare nel panorama internazionale del Sei-Settecento. La realizzazione di una spregiudicata conformazione basilicale con copertura a volte, impostata su una sequenza di colonne monolitiche giganti nelle navate e nella crociera con cupola con sostegni alti fino a 10m, è il risultato della convergenza di più fattori. Il conseguimento di questo traguardo si deve alla scoperta nel territorio di Palermo, alla fine del XVI secolo, di un calcare compatto (il “Billiemi”) dalle qualità estetiche e strutturali assimilabili al marmo e in grado di generare poderosi monoliti. Questa opportunità innescò…

Automated pre-column derivatization of amines in biological samples with dansyl chloride and with or without post-column chemiluminescence formation …

1999

On-line automation of two different liquid chromatographic procedures, a pre-column derivatization system and a pre- and post-column system, in order to generate chemiluminescence is reported. Dansyl chloride (Dns-Cl) was used as a pre-column reagent to form fluorophores and bis(2,4,6-trichlorophenyl) oxalate (TCPO) and hydrogen peroxide (H2O2) as a post-column reagent to generate chemiluminescence. This procedure is based on the employment of a primary column packed with C18 material inserted in a multi-dimensional assembly for sample clean-up and derivatization with Dns-Cl. The dansyl derivatives formed are transferred and separated in a LiChrospher 100 RP18 analytical column (125 x 4 mm …

Factors controlling plankton productivity, particulate matter stoichiometry, and export fluxin the coastal upwelling system off Peru

2020

Abstract. Eastern boundary upwelling systems (EBUS) are among the most productive marine ecosystems on Earth. The high productivity in surface waters is facilitated by upwelling of nutrient-rich deep waters, with high light availability enabling fast phytoplankton growth and nutrient utilization. However, there are numerous biotic and abiotic factors modifying productivity and biogeochemical processes. Determining these factors is important because EBUS are considered hotspots of climate change, and reliable predictions on their future functioning requires understanding of the mechanisms driving biogeochemical cycles therein. In this study, we used in situ mesocosms to obtain mechanistic un…

Interspecies interactions mediated by conductive minerals in the sediments of the ferruginous Lake La Cruz, Spain

2018

AbstractLake La Cruz is considered a biogeochemical analogue to early Earth marine environments because its water column is depleted in sulfate, but rich in methane and iron, similar to conditions envisaged for much of the Precambrian. In this early Earth analogue environment, we show that conductive particles establish a tight metabolic coupling between electroactive microbial clades. We propose that mineral-based syntrophy is of potential relevance for the evolution of Earth’s earliest complex life forms. We show that the anoxic sediment of Lake La Cruz, which is rich in biogeochemically ‘reactive’ iron minerals, harbors known electroactive species such asGeobacterandMethanothrix,in addit…

The rotifer community and its functional role in lakes of a neotropical floodplain

2014

Aquatic communities vary depending on local factors, such as environmental conditions and biological interactions and regional factors, such as the hydrological regime in floodplains. This study analyzed the community structure of rotifers and their secondary production in two lakes of an Upper Parana River floodplain (Brazil) differing in their hydrology: one connected to the river and the other isolated. Integrated samples of the water column were collected daily during 15 days in the low and high water periods. Three statistical methods, ANOVA, MRT, and IndVal were applied to distinguish the structure, biomass, and secondary production of their rotifer communities. The rotifer fauna was …