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Bibliographic Details
Main Author:	Lina Marcela Agudelo Betancur
Format:	Artículo científico
Language:	es
Published:	Corporación Universitaria Lasallista 2006
Subjects:	Estudios Agrarios Cianuro Consorcio Biodegradación Microorganismos
Online Access:	https://www.redalyc.org/articulo.oa?id=69530103
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Aislamiento de consorcio de microorganismos degradadores de cianuro Lina Marcela Agudelo Betancur Karina Isabel Macías Mazo Adelaida María Garcés Molina Natalia Andrea Salinas Alzate Estudios Agrarios Cianuro Consorcio Biodegradación Microorganismos Introducción. El cianuro se emplea en la industriaminera para recuperar oro, en forma de solución, apartir de material madre. Este compuesto es altamentetóxico, genera grandes problemas ambientalespor lo que se han desarrollado tecnologíasfísicas y químicas para su remediación. Materialesy métodos. Se aislaron tres consorcios de microorganismosde suelos provenientes de minas de orodel municipio de Amalfi, Antioquia, donde el procesode extracción de oro se lleva a cabo con mercurio.Para seleccionar los microorganismos más eficientesse incubaron los consorcios en caldo nutritivoincrementando la concentración de cianuro depotasio desde 2x10-4 ppm hasta 2.000 ppm. Todoel proceso se realizó en condiciones aerobias yanaerobias. Posteriormente el caldo nutritivo fuereemplazado paulatinamente por medio mínimomineral, con 2.000 ppm de cianuro de potasio comofuente de carbono y nitrógeno. Todos los mediosde cultivo se prepararon a pH 7. Durante está últimafase se cuantificó el cianuro consumido con unelectrodo ión-selectivo de cianuro. Resultados.Durante el desarrollo del presente trabajo se aislaronconsorcios de microorganismos de suelos deregiones mineras y se determinó su eficiencia enla degradación de cianuro de potasio. Conclusión.La degradación biológica puede ser una alternativamejor para la eliminación de este contaminante. 2006 artículo científico 1794-4449 https://www.redalyc.org/articulo.oa?id=69530103 es http://www.redalyc.org/revista.oa?id=695 Revista Lasallista de Investigación application/pdf Corporación Universitaria Lasallista Revista Lasallista de Investigación (Colombia) Num.1 Vol.3

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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