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Main Author:	NURY ALEXANDRA MUÑOZ
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional de Colombia 2006
Subjects:	Ingeniería Cianuración fluorescens Biotecnología Biodegradación
Online Access:	https://www.redalyc.org/articulo.oa?id=49614905
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Degradación microbiana de cianuro procedente de plantas de beneficio de oro mediante una cepa nativa de P. fluorecens NURY ALEXANDRA MUÑOZ OSCAR JAIME RESTREPO CARLOS ARTURO MONTOYA Ingeniería Cianuración fluorescens Biotecnología Biodegradación El cianuro es el compuesto lixiviante más utilizado en la industria metalúrgica de metalespreciosos. El cianuro presenta efectos nocivos, entre los que se destacan su alta toxicidad y su efectoinhibitorio en la respiración celular. En este trabajo se probó la alternativa biotecnológica de degradar cianuroempleando una cepa nativa de P. fluorescens, aislada a partir de muestras de arenas procedentes de plantas debeneficio de oro que utilizan la cianuración ubicadas en municipio de Segovia, Colombia.En la mayor parte de las plantas de tratamiento no se controlan técnicamente los procesos, lo cual lleva a lautilización de cantidades de NaCN por encima de las necesarias, generando altas descargas del exceso tantoen solución como en las arenas descartadas. Las pruebas de toxicidad realizadas con D. pulex indican que unaconcentración de cianuro mayor o igual a 54 ppm es suficiente para intoxicar e inhibir su sobrevivencia. Lostratamientos convencionales para degradación de cianuro, suelen ser muy comunes y eficientes, sin embargopresentan desventajas por el alto costo que conlleva la compra de los reactivos necesarios. El tratamientomicrobiano por su parte, demuestra eliminar grandes cantidades de cianuro de una manera eficiente yeconómica. 2006 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49614905 es http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.149 Vol.73

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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