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Bibliographic Details
Main Author:	Juan Pablo Castanedo-Cázares
Format:	Artículo científico
Language:	es
Published:	Instituto Mexicano del Seguro Social 2013
Subjects:	Medicina PUVA psoralenos radiación México rayos ultravioleta Fototerapia terapia
Online Access:	https://www.redalyc.org/articulo.oa?id=457745489006
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Niveles de radiación UV ambiental para dosificar el PUVA-sol en México Juan Pablo Castanedo-Cázares Bertha Torres-Álvarez Adriana Ehnis-Pérez Isaura Alba-Barba Medicina PUVA psoralenos radiación México rayos ultravioleta Fototerapia terapia Introducción: la terapia PUVA-sol tiene como ventaja su disponibilidad y bajo costo. Sin embargo, su utiliza- ción es empírica. La fi nalidad del estudio es cuanti fi car la radiación solar UVA ambiental y sugerir una forma de administración en México. Métodos: se midió la radiación UV en el centro del país (22 ºN, 101 ºO, 1877 m) mediante radiometría terrestre de 2007 a 2011. Se registró la variación por hora, mes, nubosidad y transmisión a través de placas de silicato doméstico. Resultados: más del 75 % de la radiación UVA se registra entre las 9:00 y las 17:00 horas. La intensidad anual promedio mínima fue de 20 mW/cm 2 y la máxima de 25.4 mW/cm 2 (ANOVA, p < 0.001). El cálculo de irra- diación UVA mensual durante el cenit bajo cielo despe- jado puede estimarse mediante la fórmula: 23.8 + 0.13 (mes) – 0.13 (mes – 6.5) 2 , ( r 2 = 0.95, p < 0.001). La placa común (3 mm) de silicato doméstico tiene una absor- bancia UVB de 0.93 y una transmitancia UVA de 0.58. Conclusiones: es posible el empleo racional de PUVA-sol según los datos obtenidos. Es necesario aislar la radiación UVB y ajustar la dosis según la nubosidad, así como apegarse al protocolo de seguridad a fi n de obtener bene fi cios y minimizar los efectos adversos. 2013 artículo científico 0443-5117 https://www.redalyc.org/articulo.oa?id=457745489006 es http://www.redalyc.org/revista.oa?id=4577 Revista Médica del Instituto Mexicano del Seguro Social application/pdf Instituto Mexicano del Seguro Social Revista Médica del Instituto Mexicano del Seguro Social (México) Num.3 Vol.51

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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