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1. Verfasser:	Emilio Ibarra-Morales
Format:	Artículo científico
Sprache:	es
Veröffentlicht:	Universidad Nacional Autónoma de México 2012
Schlagworte:	Biología polen arqueología palinología excavaciones Arqueobotánica
Online-Zugang:	https://www.redalyc.org/articulo.oa?id=43228285006
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Inhaltsangabe:

EL ESTUDIO DEL POLEN ANTIGUO: PROBLEMAS Y ESTRATEGIAS EN EL LABORATORIO Emilio Ibarra-Morales Beatriz Stephanie Fernández-Galán Biología polen arqueología palinología excavaciones Arqueobotánica En el Laboratorio de Paleoetnobotánica y Paleoambiente del Instituto de Investigaciones Antropológicas, se lleva a cabo el estudio de los restos botánicos recuperados principalmente de excavaciones arqueológicas realizadas por investigadores de la UNAM y de otras instituciones. Entre los restos botánicos se encuentran tanto semillas, como carbón y polen antiguo. A través de la experiencia se ha observado que la recuperación y concentración del material polínico depende de la calidad del sustrato en el que se encuentra. Se ha implementado una técnica de extracción que intenta concentrar el material polínico de una forma más adecuada. Experimentalmente se ha conseguido concentrar el polen de muestras de perfiles de suelo de un antiguo río al norte de la Cuenca de México. 2012 artículo científico 1405-888X https://www.redalyc.org/articulo.oa?id=43228285006 es http://www.redalyc.org/revista.oa?id=432 Tip Revista Especializada en Ciencias Químico-Biológicas application/pdf Universidad Nacional Autónoma de México Tip Revista Especializada en Ciencias Químico-Biológicas (México) Num.1 Vol.15

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// 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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