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Bibliographic Details
Main Author:	Carmen Calderón
Format:	Artículo científico
Language:	en
Published:	Universidad Nacional Autónoma de México 1986
Subjects:	Ciencias de la Tierra
Online Access:	https://www.redalyc.org/articulo.oa?id=37000102
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Airborne fungi isolated from rain water collected in Mexico City Carmen Calderón Sara Gutiérrez Pedro Mosiño Irma Rosas Ciencias de la Tierra A rcsearch was carried out on the lungi present in tlir atmosphere of Mexico City,through the analysis of rain watcr collected from June to Septcmber of 1982. To obtaindata ori a wide range oí fungi, isolations were made on Sabouraud dextrosc agar andpotatc) dcxtrosc agar plates incubated at the rnom tcmperaturc of 20-26QC for 48-72 hours.During tlic sampling period 600 to GOOO colonies per m1 were rccorded. The mostfrequent fungi were Cladosporium, Alternaria, Penicillium and yeasts. The relationshipbetween these airborne organisms and weather elements was established.It was found that wind speed was related to fungal counts through a corrclationcoefficient of r = 0.80 (p < 0.01). Identification at thc species leve1 of some fungi,such as Penicillium citrinum, P. clavigerurn, Fusarium semitectum, Aspergillus niger,A. candidus, A. glaucus and A. tamarii, allowed to show the presence of both pathogenicand allergenic fungi.This infonnation could be used in further studies of a medical or agronomical characterabout. the effect of environmental factors on the abundance and dispersion ofairborne fungi. 1986 artículo científico 0188-4999 https://www.redalyc.org/articulo.oa?id=37000102 en http://www.redalyc.org/revista.oa?id=370 Revista Internacional de Contaminación Ambiental application/pdf Universidad Nacional Autónoma de México Revista Internacional de Contaminación Ambiental (México) Num.1 Vol.2

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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