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Main Author:	Fernando Tapia PASTRANA
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional Autónoma de México 2004
Subjects:	Biología México Karwinskia especiación citogenética talla cromosómica
Online Access:	https://www.redalyc.org/articulo.oa?id=40075101
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Estudio cromosómico en tres especies de Karwinskia (Rhamnaceae) endémicas de México Fernando Tapia PASTRANA Rafael Fernández NAVA Sandra Gómez ACEVEDO Pedro Mercado RUARO Biología México Karwinskia especiación citogenética talla cromosómica Se analizaron citogenéticamente células de meristemos radicularesobtenidos de semillas provenientes de 5-10 individuos de cada una de las siguientesespecies: Karwinskia mollis (Guadalcázar, San Luis Potosí), K. tehuacana(Atoyatempan, Puebla) y K. umbellata (Ahuetzingo, Morelos). El númerocromosómico 2n=24 fue constante para las tres especies, con x=12 como númerobásico; se obtuvieron además, la longitud cromosómica total diploide y elintervalo cromosómico. Los complementos cromosómicos se caracterizaron porcromosomas muy pequeños (0.68-1.28 mm), predominando aquellos concentrómero medio y submedio. El par cromosómico más pequeño de cada especiepresentó una constricción secundaria, relativamente amplia, asociada a unanotoria porción satelital. Los datos se compararon con los obtenidos en un estudiocitogenético previo realizado en K. humboldtiana. Tomados en conjunto, estosdatos sugieren que muy probablemente los cambios cromosómicos han tenidouna escasa participación en los eventos de especiación del género Karwinskia;sin embargo, las diferencias en las tallas de los complementos cromosómicos seconsideran como una posible explicación de la distribución actual de estas especies. 2004 artículo científico 0185-254X https://www.redalyc.org/articulo.oa?id=40075101 es http://www.redalyc.org/revista.oa?id=400 Anales del Instituto de Biología. Serie Botánica application/pdf Universidad Nacional Autónoma de México Anales del Instituto de Biología. Serie Botánica (México) Num.1 Vol.75

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* * @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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