<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0122-9354</journal-id>
<journal-title><![CDATA[Revista de Medicina Veterinaria]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Med. Vet.]]></abbrev-journal-title>
<issn>0122-9354</issn>
<publisher>
<publisher-name><![CDATA[Universidad de La Salle]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-93542012000100003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Mortalidad en larvas de Culex quinquefasciatus y Anopheles albimanus (díptera: culicidae), causada con un producto de Bacillus sphaericus (bacteria: bacillaceae) en presentación granulada en condiciones experimentales]]></article-title>
<article-title xml:lang="en"><![CDATA[Larval Mortality in Culexquinquefasciatus and Anopheles albimanus (diptera: culicidae), Caused with a Bacillus sphaericus (bacteria: bacillaceae) Granulated Product in Experimental Conditions]]></article-title>
<article-title xml:lang="pt"><![CDATA[Mortalidade em larvas de Culex quinquefasciatus e Anopheles albimanus (diptera:culicídeos), causada com um produto de Bacillus sphaericus (bactéria: bacillaceae) em apresentação granulada em condições experimentais]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cárdenas Castro]]></surname>
<given-names><![CDATA[Estrella]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rozo Bautista]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lugo Vargas]]></surname>
<given-names><![CDATA[Ligia]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de La Salle  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de La Salle  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Nacional de Salud Red Nacional de Laboratorios ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<numero>23</numero>
<fpage>23</fpage>
<lpage>32</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-93542012000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-93542012000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-93542012000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo de este estudio fue ensayar una serie de concentraciones de un producto granulado preparado con Bacillus sphaericus, sobre larvas de Culex quinquefasciatus y Anopheles albimanus en condiciones de laboratorio. Se utilizaron once concentraciones (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 y 500 ppm) sobre larvas de An. albimanus, y ocho concentraciones diez veces menores (2, 4, 6, 8, 10, 12, 14 y 16 ppm) sobre larvas de Cx. quinquefasciatus. Se utilizaron 60 larvas y un control con 20 larvas por concentración. El tiempo de exposición fue de 48 h, a una temperatura de 28 ± 2 °C. Para estimar las concentraciones letales 50 y 95 se utilizó la prueba Probit. Se encontró una CL95 de B. sphaericus entre 6,45 y 7,28 ppm para larvas de Cx. quinquefasciatus; mientras que en larvas de An. albimanus se observó una CL95 entre 450,56 y 466,76 ppm.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The purpose of this study was to assay a series of concentrations of a granulated product prepared with Bacillus sphaericus on Culexquinquefasciatus and Anopheles albimanus larvae in laboratory conditions. Eleven concentrations (20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 500 ppm) were used on An. Albimanus larvae and eight concentrations ten times smaller (2, 4, 6, 8, 10, 12, 14, 16 ppm) were used on Cx. quinquefasciatus larvae. Sixty (60) larvae and a control with 20 larvae were used per concentration. The time of exposure was of 48 hours at a laboratory temperature of 28 ± 2 °C. LC50 and LC95 were determined through the Probit tests. A LC95 of B. sphaericus was found between 6,45 and 7,28 ppm for Cx. quinquefasciatus larvae; whereas LC95 was observed between 450.56 and 466.76 ppm in An. albimanus larvae.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O objetivo deste estudo foi testar uma série de concentrações de um produto granulado preparado com Bacillus sphaericus, sobre larvas de Culex quinquefasciatus e Anopheles albimanus em condições de laboratório. Utilizaram-se onze concentrações (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 e 500 ppm) sobre larvas de An. albimanus, e oito concentrações dez vezes menores (2, 4, 6, 8, 10, 12, 14 e 16 ppm) sobre larvas de Cx. quinquefasciatus. Utilizaram-se 60 larvas e um controle com 20 larvas por concentração. O tempo de exposição foi de 48h, a uma temperatura de 28 ± 2 °C. Para estimar as concentrações letais 50 e 95 utilizou-se o teste Probit. Encontrou-se uma CL95 de B. sphaericus entre 6,45 e 7,28 ppm para larvas de Cx. quinquefasciatus; enquanto que em larvas de An. Albimanus observou-se uma CL95 entre 450,56 e 466,76 ppm.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[control biológico]]></kwd>
<kwd lng="es"><![CDATA[microorganismos]]></kwd>
<kwd lng="es"><![CDATA[mortalidad]]></kwd>
<kwd lng="es"><![CDATA[mosquitos]]></kwd>
<kwd lng="pt"><![CDATA[controle biológico]]></kwd>
<kwd lng="pt"><![CDATA[micro-organismos]]></kwd>
<kwd lng="pt"><![CDATA[mortalidade]]></kwd>
<kwd lng="pt"><![CDATA[mosquitos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="verdana" size="2">      <br>    <p align="center"><font size="4"><b>Mortalidad en larvas de <i>Culex quinquefasciatus</i>    <br> y <i>Anopheles albimanus (d&iacute;ptera: culicidae),    <br> </i>causada con un producto de <i>Bacillus sphaericus    <br> (bacteria: bacillaceae) </i>en presentaci&oacute;n granulada    <br> en condiciones experimentales</b></font></p>      <p>Estrella C&aacute;rdenas Castro<a name="nota1"></a><a href="#nota_1"><sup>1</sup></a> / &Aacute;lvaro Rozo Bautista<a name="nota2"></a><a href="#nota_2"><sup>2</sup></a> / Ligia Lugo Vargas<a name="nota3"></a><a href="#nota_3"><sup>3</sup></a>      <p><sup><a name="nota_1"></a><a href="#nota1">1</a></sup> Bi&oacute;loga. MSc. Docente-Investigadora, Universidad de La Salle, Colombia. <a href="mailto:ecardenas@unisalle.edu.co">ecardenas@unisalle.edu.co</a></p>      <p><sup><a name="nota_2"></a><a href="#nota2">2</a></sup> Bi&oacute;loga y qu&iacute;mica. MSc. Docente Investigador, Universidad de La Salle, Colombia.<b> </b><a href="mailto:arozo@unisalle.edu.co">arozo@unisalle.edu.co</a></p>      ]]></body>
<body><![CDATA[<p><sup><a name="nota_3"></a><a href="#nota3">3</a></sup> Bi&oacute;loga. MSc. Docente-investigadora, Universidad Santo Tom&aacute;s, Colombia. Red Nacional de Laboratorios, Instituto Nacional de Salud, Colombia. <a href="mailto:illugo@ins.gov.co">illugo@ins.gov.co</a></p>      <p><b>Recibido:</b> 29 de mayo del 2011. <b>Aceptado:</b> 17 de febrero del 2012</p>  <hr>  <font size="3">     <p><b>Resumen</b></p></font>      <p align="justify">El objetivo de este estudio fue ensayar una serie de concentraciones de un producto granulado preparado con <i>Bacillus sphaericus, </i>sobre larvas de <i>Culex quinquefasciatus </i>y <i>Anopheles albimanus </i>en condiciones de laboratorio. Se utilizaron once concentraciones (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 y 500 ppm) sobre larvas de <i>An. albimanus, </i>y ocho concentraciones diez veces menores (2, 4, 6, 8, 10, 12, 14 y 16 ppm) sobre larvas de <i>Cx. quinquefasciatus. </i>Se utilizaron 60 larvas y un control con 20 larvas por concentraci&oacute;n. El tiempo de exposici&oacute;n fue de 48 h, a una temperatura de 28 &plusmn; 2 &deg;C. Para estimar las concentraciones letales 50 y 95 se utiliz&oacute; la prueba Probit. Se encontr&oacute; una CL<sub>95</sub> de <i>B. sphaericus </i>entre 6,45 y 7,28 ppm para larvas de <i>Cx. quinquefasciatus; </i>mientras que en larvas de <i>An. albimanus </i>se observ&oacute; una CL<sub>95 </sub>entre 450,56 y 466,76 ppm.</p>      <p align="justify"><b>Palabras clave: </b>control biol&oacute;gico, microorganismos, mortalidad, mosquitos.</p>  <hr>      <br>    <p align="center"><font size="3"><b>Larval Mortality in <i>Culexquinquefasciatus </i>and <i>Anopheles</i>    <br> <i>albimanus </i>(diptera: <i>culicidae), </i>Caused with a <i>Bacillus    <br> sphaericus </i>(bacteria: <i>bacillaceae) </i>Granulated Product in    <br> Experimental Conditions</b></font></p>  <font size="3">     ]]></body>
<body><![CDATA[<p><b>Abstract</b></p></font>      <p align="justify">The purpose of this study was to assay a series of concentrations of a granulated product prepared with <i>Bacillus sphaericus </i>on <i>Culexquinquefasciatus </i>and <i>Anopheles albimanus </i>larvae in laboratory conditions. Eleven concentrations (20, 40, 60, 80, 100, 120, 140, 160, 180, 200, 500 ppm) were used on <i>An. Albimanus </i>larvae and eight concentrations ten times smaller (2, 4, 6, 8, 10, 12, 14, 16 ppm) were used on <i>Cx. quinquefasciatus </i>larvae. Sixty (60) larvae and a control with 20 larvae were used per concentration. The time of exposure was of 48 hours at a laboratory temperature of 28 &plusmn; 2 &deg;C. LC<sub>50</sub> and LC95 were determined through the Probit tests. A LC95 of <i>B. sphaericus </i>was found between 6,45 and 7,28 ppm for <i>Cx. quinquefasciatus </i>larvae; whereas LC95 was observed between 450.56 and 466.76 ppm in <i>An. albimanus </i>larvae.</p>      <p align="justify"><b>Keywords: </b>Biological control, microorganisms, mortality, mosquitoes.</p>  <hr>      <br>    <p align="center"><font size="3"><b>Mortalidade em larvas de <i>Culex quinquefasciatus </i>e <i>Anopheles    <br> albimanus </i>(diptera:culic&iacute;deos), causada com um produto de    <br> <i>Bacillus sphaericus </i>(bact&eacute;ria: <i>bacillaceae) </i>em apresenta&ccedil;&atilde;o    <br> granulada em condi&ccedil;&otilde;es experimentais</b></font></p>  <font size="3">     <p><b>Resumo</b></p></font>      <p align="justify">O objetivo deste estudo foi testar uma s&eacute;rie de concentra&ccedil;&otilde;es de um produto granulado preparado com <i>Bacillus sphaericus, </i>sobre larvas de <i>Culex quinquefasciatus </i>e <i>Anopheles albimanus </i>em condi&ccedil;&otilde;es de laborat&oacute;rio. Utilizaram-se onze concentra&ccedil;&otilde;es (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 e 500 ppm) sobre larvas de <i>An. albimanus, </i>e oito concentra&ccedil;&otilde;es dez vezes menores (2, 4, 6, 8, 10, 12, 14 e 16 ppm) sobre larvas de <i>Cx. quinquefasciatus. </i>Utilizaram-se 60 larvas e um controle com 20 larvas por concentra&ccedil;&atilde;o. O tempo de exposi&ccedil;&atilde;o foi de 48h, a uma temperatura de 28 &plusmn; 2 &deg;C. Para estimar as concentra&ccedil;&otilde;es letais 50 e 95 utilizou-se o teste Probit. Encontrou-se uma CL<sub>95</sub> de <i>B. sphaericus </i>entre 6,45 e 7,28 ppm para larvas de <i>Cx. quinquefasciatus; </i>enquanto que em larvas de <i>An. Albimanus </i>observou-se uma CL<sub>95 </sub>entre 450,56 e 466,76 ppm.</p>      ]]></body>
<body><![CDATA[<p><b>Palavras chave: </b>controle biol&oacute;gico, micro-organismos, mortalidade, mosquitos.</p>  <hr>  <font size="3">     <p><b>Introducci&oacute;n</b></p></font>      <p align="justify">Se han encontrado en todo el mundo m&aacute;s de 480 especies del g&eacute;nero <i>Anopheles; </i>no obstante, cerca de 80 especies se han reportado como vectores de malaria (1).</p>      <p align="justify">La especie <i>Culex quinquefasciatus </i>se encuentra ampliamente en zonas tropicales y subtropicales. Esta especie est&aacute; implicada en la transmisi&oacute;n de las filarias <i>Wuchereria bancrofti </i>y <i>Dirofilaria immitis </i>(2, 3). Adem&aacute;s, es vector de varios virus: virus del Nilo occidental y de los virus causantes de la encefalitis de San Luis y la encefalitis equina venezolana (4). En Colombia, <i>C. quinquefasciatus </i>est&aacute; ampliamente distribuida desde las zonas costeras, llanos orientales, Amazonas, Choc&oacute; y las zonas altoandinas (5, 6). En la Sabana de Bogot&aacute; se ha constituido en un problema de salud p&uacute;blica puesto que su picadura causa alergias y molestias originadas en la alta densidad de sus poblaciones (6).</p>      <p align="justify">La especie <i>Anopheles albimanus </i>presenta una gran distribuci&oacute;n geogr&aacute;fica en la zona tropical de las Am&eacute;ricas y es vector efectivo de malaria (7-9). En zonas con altas densidad en las poblaciones de esta especie, las hembras adultas se alimentan con sangre humana o de animales dom&eacute;sticos desde las primeras horas de la noche hasta la medianoche (10, 11). En Colombia se han encontrado aproximadamente 45 especies de <i>Anopheles, </i>de las cuales son consideradas vectores de malaria: <i>Anopheles albimanus, An. darlingi </i>y <i>An. nuneztovari; </i>en cuanto a los departamentos en los cuales se ha encontrado mayor presencia de malaria se se&ntilde;alan: Antioquia, Nari&ntilde;o, C&oacute;rdoba, Choc&oacute;, Meta, Guaviare y Putumayo (12).</p>      <p align="justify">La utilizaci&oacute;n de insecticidas organosint&eacute;ticos para el control de insectos vectores y plagas de cultivos ha generado resistencia en las poblaciones naturales de estos insectos (13). El control biol&oacute;gico utiliza un agente con capacidad para reducir el tama&ntilde;o de una poblaci&oacute;n de insectos vectores o plagas y se ha considerado como una alternativa para minimizar poblaciones de estos insectos. El agente biol&oacute;gico puede ser un pat&oacute;geno, un depredador, un competidor o una toxina derivada de microorganismos o de plantas (14).</p>      <p align="justify"><i>Bacillus sphaericus </i>es una bacteria que se encuentra en forma natural en todo el mundo. Esta bacteria fue registrada por la Agencia de Protecci&oacute;n Ambiental (EPA, por su sigla en ingl&eacute;s) para ser usada como larvicida en diferentes especies de mosquitos. Las larvas de mosquitos ingieren esta bacteria que se libera en el intestino y la toxina se adhiere a sus c&eacute;lulas, las cuales contienen receptores espec&iacute;ficos para la misma, y los mosquitos mueren por intoxicaci&oacute;n. Los mam&iacute;feros no contienen receptores para esta toxina (15).</p>      <p align="justify">Desde que se descubri&oacute; que <i>B. sphaericus </i>presentaba toxicidad para larvas de mosquitos (16) se han descrito varias cepas de esta bacteria con propiedades larvicidas. La cepa <i>B. sphaericus</i>-2362 fue aislada de adultos de <i>Simulium damnosum </i>en Nigeria y mostr&oacute; alta toxicidad en larvas (17), desde entonces ha sido la m&aacute;s ensayada y utilizada como alternativa para el control de mosquitos. Varios autores han demostrado que la cepa 2362 de <i>B. sphaericus </i>presenta alta efectividad t&oacute;xica en los g&eacute;neros <i>Anopheles, Culex </i>y <i>Psorophora, </i>y para algunas especies del g&eacute;nero <i>Aedes; </i>mientras que en las especies <i>Ae. aegypti </i>y <i>Ae. albopictus </i>no encontraron efectividad (18-25).</p>      <p align="justify">Davidson et &aacute;l. (26) reportaron que <i>B. sphaericus </i>es efectivo contra especies de los g&eacute;neros <i>Anopheles </i>y <i>Culex, </i>y menos efectivo contra especies del g&eacute;nero <i>Aedes; </i>adem&aacute;s, presenta actividad t&oacute;xica y alta persistencia en aguas contaminadas (21). Vilarinhos et &aacute;l. (27) demostraron que <i>B. sphaericus</i>-2362 es efectivo contra larvas de <i>Ae. aegypti </i>a concentraciones de 1580 ppb, y Melo et &aacute;l. (28) encontraron una mortalidad del 70% en <i>Ae. aegypti </i>en una concentraci&oacute;n de 1 g/L de <i>B. sphaericus. </i>Las ventajas que presenta <i>B. sphaericus </i>son las siguientes: baja toxicidad ambiental dada la alta especificidad de sus toxinas, altos niveles de eficacia y persistencia en el ambiente (14). La actividad t&oacute;xica de <i>B. sphaericus </i>sobre larvas de mosquitos ha sido ampliamente estudiada en el mundo (23, 24, 27, 29-45).</p>      <p align="justify">En Colombia se han realizado varios estudios sobre actividad t&oacute;xica de Griselesf <i>B. sphaericus </i>en formulaci&oacute;n l&iacute;quida sobre larvas de mosquitos <i>Cx. quinquefasciatus, Ae. taeniorhynchus </i>y <i>An. albimanus </i>bajo condiciones de campo en Buenaventura (46), y en sumideros de Cali se ha utilizado VectoMax para el control de larvas de mosquitos (47). En Medell&iacute;n se realiz&oacute; una investigaci&oacute;n para la introducci&oacute;n de genes de <i>B. thuringiensis </i>dentro de <i>B. sphaericus </i>con la finalidad de aumentar la efectividad de esta &uacute;ltima contra larvas de mosquitos (48).</p>      ]]></body>
<body><![CDATA[<p align="justify">La presente investigaci&oacute;n procura contribuir a la comprensi&oacute;n de alternativas para el control de mosquitos, que sean amigables con el medio ambiente y que tengan alto potencial para minimizar el uso de insecticidas qu&iacute;micos.</p>  <font size="3">     <br>    <p><b>Materiales y m&eacute;todo</b></p></font>  <font size="3">     <p><b>Colecta y cr&iacute;a de mosquitos</b></p></font>      <p align="justify">Se realizaron recolecciones de adultos y larvas de <i>Cx. quinquefasciatus </i>en la vereda San Antonio en Villavicencio, Meta (4&deg; 07' 38,21&quot;N;73&deg; 31' 09,34&quot;W, elevaci&oacute;n 341 m) y en el embalse del Mu&ntilde;a en Sibat&eacute;, Cundinamarca (4&deg; 31' 0,2'' N; 74&deg; 15' 05''W, elevaci&oacute;n 2568 m), y se trasladaron al laboratorio de Entomolog&iacute;a del Instituto Nacional de Salud para su mantenimiento y colonizaci&oacute;n. Se realizaron observaciones de los espec&iacute;menes bajo estereomicroscopio, y para la determinaci&oacute;n taxon&oacute;mica de la especie se utilizaron las claves taxon&oacute;micas de Cova-Garc&iacute;a et &aacute;l. (49).</p>      <p align="justify">Las colonias <i>An. albimanus </i>utilizadas en los ensayos se originaron de colecciones realizadas en Barranquilla y Cartagena en 1978, establecidas y mantenidas en el Laboratorio de Entomolog&iacute;a del Instituto Nacional de Salud, y determinadas con las claves taxon&oacute;micas de Cova-Garc&iacute;a y Sutil (50).</p>      <p align="justify">Se utiliz&oacute; una c&aacute;mara clim&aacute;tica Sherer con las siguientes condiciones ambientales: temperatura 28 &plusmn; 2 &deg;C, humedad relativa 62 &plusmn; 5%, y fotoperiodo 12:12 h (luz/oscuridad) para el mantenimiento de las colonias de ambas especies, tanto larvas como adultos. Los adultos se mantuvieron dentro de jaulas Gerber (polipropileno y angeo fino 30x30x30 cm, provistas de una manga de muselina para introducir los mosquitos) y se les proporcion&oacute; glucosa al 30% en motas de algod&oacute;n. Para la alimentaci&oacute;n de las hembras con sangre se les coloc&oacute; dentro de la misma jaula un rat&oacute;n (Mus <i>musculus, </i>colonia ICR, Bioterio de Producci&oacute;n del Instituto Nacional de Salud) anestesiado con pentotal s&oacute;dico (10 mg/kg de peso del animal) cada tercer d&iacute;a y por una hora. Para la oviposici&oacute;n se les proporcion&oacute; un recipiente de pl&aacute;stico (1000 ml) con 500 ml de agua destilada. Las posturas fueron transferidas a bandejas pl&aacute;sticas (ancho 22 x 22 cm y alto 10 cm) para la cr&iacute;a de larvas las cuales se alimentaron con rodentina pulverizada.</p>  <font size="3">     <br>    <p><b>Bioensayos</b></p></font>      <p align="justify">Los bioensayos fueron realizados en el Laboratorio de Entomolog&iacute;a del Instituto Nacional de Salud de Bogot&aacute; con base en la cantidad del ingrediente activo (B. <i>sphaericus) </i>contenido en el producto granulado; se prepar&oacute; un litro de soluci&oacute;n <i>stock </i>(500 ppm) y a partir de esta soluci&oacute;n se prepararon las diluciones para los bioensayos. En larvas del cuarto estadio de <i>An. albimanus </i>se ensayaron once concentraciones (20, 40, 60, 80, 100, 120, 140, 160, 180, 200 y 500 ppm), y en larvas del cuarto estadio <i>de Cx. quinquefasciatus </i>se ensayaron ocho concentraciones (2, 4, 6, 8, 10, 12, 14 y 16 ppm). Para ensayar cada concentraci&oacute;n se utilizaron cuatro recipientes pl&aacute;sticos (6 cm alto x 8 cm di&aacute;metro); en tres recipientes se vertieron 100 ml de la concentraci&oacute;n correspondiente y se colocaron 20 en cada uno, y en el recipiente control se vertieron 100 ml de agua destilada y 20 larvas. Luego, los recipientes con los ensayos se llevaron a la c&aacute;mara Sherer con las mismas condiciones ambientales anotadas anteriormente. Las larvas tratadas se revisaron a las 24 y 48 horas, se registr&oacute; el n&uacute;mero de larvas muertas y se determin&oacute; el porcentaje de mortalidad causada por el biolarvicida.</p>  <font size="3">     ]]></body>
<body><![CDATA[<br>    <p><b>An&aacute;lisis estad&iacute;stico</b></p></font>      <p align="justify">El test Probit se realiz&oacute; seg&uacute;n McCullagh y Nelder (51), y la evaluaci&oacute;n de la significancia estad&iacute;stica de los par&aacute;metros del modelo Probit se hizo siguiendo a Cox y Hinkley (52). Las concentraciones letal 50 y letal 95, y sus respectivos intervalos de confianza al nivel del 95% se determinaron seg&uacute;n Hosmer y Lemeshow (53).</p>  <font size="3">     <br>    <p><b>Resultados</b></p></font>      <p align="justify">En la  <a href="img/revistas/rmv/n23/n23a03t01.jpg" target="_blank">tabla 1</a> se observa que el porcentaje de mortalidad en larvas de cuarto instar de las dos colonias <i>An. albimanus </i>fue bajo a las 24 y a las 48 horas, en concentraciones desde 20 hasta 200 ppm la mortalidad estuvo por debajo del 50%, mientras que a 500 ppm la mortalidad estuvo entre el 86,7 y el 100%.</p>      <p align="justify">En la  <a href="img/revistas/rmv/n23/n23a03t02.jpg" target="_blank">tabla 2</a> se observa que el porcentaje de mortalidad en larvas de cuarto instar de las dos colonias <i>Cx. quinquefasciatus </i>por efecto del producto granulado de <i>B. sphaericus </i>estuvo entre el 18,3 y 80% de mortalidad a las 24 horas; mientras que a las 48 horas, en concentraciones desde 2 ppm hasta 10 ppm la mortalidad estuvo entre el 73,3 y el 100%.</p>      <p align="justify">La  <a href="#t_03">tabla 3</a> muestra valores altos en el error est&aacute;ndar para el par&aacute;metro (S0, lo cual demuestra alta variabilidad en los datos. Sin embargo, el test de significancia para el par&aacute;metro (S1 permite determinar que el producto granulado de <i>B. sphaericus </i>tuvo efecto estad&iacute;sticamente significativo sobre la mortalidad de las larvas de <i>An. albimanus </i>en las colonias Barranquilla y Cartagena, y sobre las larvas de <i>Cx. quinquefasciatus </i>en las colonias Sibat&eacute; y Villavicencio, dado que los valores de <i>P </i>fueron menores a 0,05.</p>      <p align="center"><a name="t_03"></a><img src="img/revistas/rmv/n23/n23a03t03.jpg"></p>      <p align="justify">En la  <a href="img/revistas/rmv/n23/n23a03t04.jpg" target="_blank">tabla 4</a> se aprecia que las CL50 y CL95 presentaron valores m&aacute;s bajos para larvas de <i>An. albimanus </i>colonia Barranquilla comparados con la colonia Cartagena; mientras que para larvas de <i>C. quinquefasciatus </i>las CL50 y CL95 presentaron valores m&aacute;s altos en larvas de la colonia Villavicencio comparados con la colonia Sibat&eacute;.</p>  <font size="3">     ]]></body>
<body><![CDATA[<br>    <p><b>Discusi&oacute;n</b></p></font>      <p align="justify">En un primer ensayo se probaron concentraciones entre 5 y 200 ppm del producto granulado <i>B. sphaericus, </i>y a las 24 horas se observ&oacute; que todas las larvas de <i>Cx. quinquefasciatus </i>hab&iacute;an muerto y todas las larvas de <i>An. albimanus </i>permanec&iacute;an vivas. Por esta raz&oacute;n, fue necesario ajustar las concentraciones diez veces menores para <i>Cx. quinquefasciatus </i>y subir las concentraciones para <i>An. albimanus. </i>Al respecto, Singh y Prakash (54) utilizaron concentraciones diferentes para evaluar <i>B. sphaericus </i>en larvas de <i>An.</i> <i>stephensi </i>y <i>Cx. quinquefasciatus. </i>Tal como se observa en las  <a href="img/revistas/rmv/n23/n23a03t01.jpg" target="_blank">tablas 1</a>,  <a href="img/revistas/rmv/n23/n23a03t02.jpg" target="_blank">2</a> y  <a href="img/revistas/rmv/n23/n23a03t04.jpg" target="_blank">4</a>; las larvas de <i>Cx. quinquefasciatus </i>fueron m&aacute;s sensibles a concentraciones bajas entre 8 y 12 ppm del producto granulado de <i>B. sphaericus </i>comparadas con las larvas de <i>An. albimanus </i>las cuales mostraron alta toxicidad a concentraciones altas (500 ppm). Estos resultados son acordes con lo reportado por varios autores (18, 20, 26-28, 44, 55, 56), quienes observaron similar acci&oacute;n larvicida de <i>B. sphaericus </i>2362 y otras cepas, sobre larvas de <i>Cx. quinquefasciatus </i>comparadas con larvas de otras especies de mosquitos.</p>      <p align="justify">En el presente trabajo se encontraron valores de CL<sub>95</sub> entre 6,4 y 7,3 ppm del producto granulado de <i>B. sphaericus </i>para larvas de <i>Cx. quinquefasciatus; </i>mientras que en larvas de <i>An. albimanus </i>se encontr&oacute; una CL<sub>95</sub> entre 450,5 y 466,7 ppm. Similar tendencia encontraron Vilarinhos et &aacute;l. (27) para larvas de <i>Cx. quinquefasciatus </i>con CL<sub>90</sub> = 2,15 ppb de <i>B. sphaericus </i>2362; mientras que en larvas de <i>An. albimanus </i>encontraron una CL<sub>90</sub> = 38 ppb; estas observaciones confirman la tendencia diferente de toxicidad de los productos de <i>B. sphaericus </i>en las dos especies de mosquitos.</p>      <p align="justify">Los resultados de este estudio muestran que las CL<sub>50</sub> y CL<sub>95</sub> presentan valores ligeramente m&aacute;s altos para larvas de <i>An. albimanus </i>colonia Cartagena comparados con la colonia Barranquilla; lo mismo se observ&oacute; en larvas de <i>Cx. quinquefasciatus </i>colonia Villavicencio comparados con la colonia Sibat&eacute;. Lo anterior sugiere que la susceptibilidad de las larvas al producto granulado de <i>B. sphaericus </i>var&iacute;a seg&uacute;n la procedencia regional del mosquito.</p>  <font size="3">     <br>    <p><b>Agradecimientos</b></p></font>      <p align="justify">A la Universidad de La Salle, a la Universidad Santo Tom&aacute;s y al Instituto Nacional de Salud por la financiaci&oacute;n de la investigaci&oacute;n.</p>      <p align="justify">A la doctora Luz Marina Rond&oacute;n Poveda, por su asesor&iacute;a en la parte estad&iacute;stica.</p>      <p align="justify">Al auxiliar de laboratorio John Mu&ntilde;oz, del Instituto Nacional de Salud, por su colaboraci&oacute;n en el mantenimiento de las colonias de mosquitos.</p>  <hr>  <font size="3">     ]]></body>
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