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Autore principale:	Wilberth Magaña Benítez
Natura:	Artículo científico
Lingua:	es
Pubblicazione:	Asociación Iberoamericana de Tecnología Postcosecha, S.C. 2013
Soggetti:	Agrociencias acidez firmeza respiración
Accesso online:	https://www.redalyc.org/articulo.oa?id=81327871005
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VARIACIONES BIQUÍMICAS-FISIOLÓGICAS Y FISICAS DE LAS FRUTAS DE PITAHAYA (Hylocereusundatus) ALMACENADAS EN AMBIENTE NATURAL Wilberth Magaña Benítez Enrique Sauri Duch Joel Corrales García Crescenciano Saucedo Veloz Agrociencias acidez acidez firmeza firmeza respiración En Yucatán, México, se seleccionaron frutas de pitahaya (Hylocereus undatus) cosechadas considerando como índice de corte entre un 50-‐70% de coloración roja en la superficie externa de la piel fueron llevadas al Laboratorio de Ciencia y Tecnología de Alimentos del Instituto Tecnológico de Mérida. Se evaluaron en las frutas almacenadas en ambiente natural (26 °C + 2 y 70 % de HR) durante seis días, las variaciones bioquímicas-‐fisiológicas y físicas. Las evaluaciones se realizaron al momento del corte o día cero (tratamiento 1), al día 3 (tratamiento 2) y al día 6 (tratamiento 3). Se analizaron las variaciones de las variables firmeza, contenido de acidez, pH del jugo, contenido de sólidos solubles totales (SST) del jugo, contenido de antocianinas en la piel, actividad enzimática (“polifenoloxidasa en la piel y pectinmetilesterasa en la pulpa”), pérdida de peso, respiración y color externo de la piel. Se encontró en las frutas, que desde su recolección hasta el sexto día mantuvieron sus atributos de calidad caracterizados por presentar una pérdida de peso menor del 8 %, una disminución de los valores de acidez entre 0.5 y 0.1 %, un incremento del pH desde 4 hasta 7, aumento del contenido de antocianinas, así como un patrón de respiración característico de las frutas no climatéricas. Los indicadores firmeza, SST, color externo de la piel, actividad de las enzimas polifenoloxidasa y pectinmetilesterasa no presentaron variaciones. 2013 artículo científico 1665-0204 https://www.redalyc.org/articulo.oa?id=81327871005 es http://www.redalyc.org/revista.oa?id=813 Revista Iberoamericana de Tecnología Postcosecha application/pdf Asociación Iberoamericana de Tecnología Postcosecha, S.C. Revista Iberoamericana de Tecnología Postcosecha (México) Num.1 Vol.14

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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Documenti analoghi

Environment & details:

Environment & details: