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Act a Científica ACTA CIENTÍFICA ASOCIACIÓN DE MAESTROS DE PUERTO RICO ISSN. 1940-1148 VOL. 17 NÚM 1-3, 2003 Acta Científica ASOCIACIÓN DE MAESTROS DE CIENCIA DE PUERTO RICO ______________________________________________________________________________ ______________________________________________________________________________ Editor ACTA CIENTÍFICA es la revista multidisciplinaria de la Asociación de Maestros de Ciencia de Puerto Rico. ACTA considera para su publicación, trabajos originales en cualquier área de la ciencia, a saber, física, química, bioquímica, Ariel E. Lugo zoología, botánica, ecología, biomédica, medicina, ciencias terrestres, ciencias atmosféricas, psicología del comportamiento, tecnología farmacéutica o matemáticas. Un artículo describe un estudio completo y definitivo. Una nota es un proyecto completo, pero más corto, que se refiere a hallazgos originales o importantes modificaciones de técnicas ya descritas. Un Editor de producción ensayo trata aspectos relacionados con la ciencia, pero no está basado en resultados experimentales originales. Una revisión Evelyn Pagán es un artículo que comenta la literatura más reciente sobre un tema especializado. Los manuscritos deben ser enviados en triplicado al Editor, quien los someterá a revisión crítica de revisores en el Editor técnico área de ciencia concernida. La aceptación de trabajos debe ser escritos en español e inglés. El requisito de manuscritos Migdalia Álvarez enviados para publicación que el mismo no es ni ha sido presentado a otra revista científica. Contribuciones a la revista deberán ser dirigidas al Editor. Oficial administrativo Ariel E. Lugo Editor Acta Científica Mildred Alayón Instituto Internacional de Dasonomía Tropical Servicio Forestal Departamento de Agricultura de los Estados Unidos PO Box 25000 Río Piedras, Puerto Rico 00928-5000 ___________________ Para asegurar la consideración de su manuscrito, se aconseja prepararlo de acuerdo a las siguientes INSTRUCCIONES PARA AUTORES: PORTADA - Los trabajos deben ir acompañados de un resumen en español y un abstract en inglés, escrito a doble espacio y en hojas separadas, encabezadas por el título completo del trabajo traducido al español y al inglés en cada caso. El título debe ser informativo y corto, generalmente no más de 12 palabras. El autor debe indicar un título La portada presenta más breve (no más de 40 letras), en el mismo idioma del trabajo, para ser utilizado como encabezamiento de cada imágenes nocturnas página (running head). captadas por el satélite - Las figuras y fotografías deben identificarse en el reverso a lápiz con el número que le corresponde, el nombre DMSP-OLS, de la del primer autor y título del trabajo. Debe presentarse una lista de figuras junto con las leyendas de cada una, saturación de luz mecanografiadas a doble espacio en hojas separadas del artículo. promedio en Puerto Rico - Las tablas deben: mecanografiarse a doble espacio, presentarse cada tabla en hojas separadas, enumerarse para los años 1992-93 y consecutivamente, tener un título breve, y ser precisas. No deben repetir material en tablas y en figuras. 2000. Para más detalles - Los autores deben usar el sistema métrico para sus medidas. Consúltese el Sistema Internacional de Unidades ver el artículo en las (SI) como guía en la conversión de sus medidas. Al redactar texto y preparar figuras, nótese que el sistema internacional de unidades requiere: (1) el uso de términos masa o fuerza en vez de peso; (2) cuando una unidad páginas 3-8 de esta es expresada en denominador, se debe utilizar el sólido (e.g., g/m2); para dos o más unidades en un denominador, edición. use el sólido y un decimal (e.g., g/m2 .d); y, (3) use la “L” como el símbolo de litro. - Compagine las partes de su manuscritos en este orden: página de título, abstracto, texto, agradecimiento, literatura citada, anejos, tablas, leyendas de figuras, y figuras: Enumere todas las páginas. En general recomendamos a los autores acompañar el texto del trabajo con una lista de todos los anejos, figuras, fotografías, tablas, etc. ACTA proveerá 25 separatas de cada artículo libre de costo. El autor principal recibirá las separatas y podrá ordenar copias adicionales al momento de devolver las pruebas de galeras. El editor es responsable de los comentarios y editoriales que aparezcan sin firma. Las opiniones expresadas no son necesariamente aquellas de la Asociación de Maestros de Ciencia de Puerto Rico, ni obligan a sus miembros. Los lectores están cordialmente invitados a expresar sus opiniones en la sección Cartas al Editor. Esta revista no tiene propósitos comerciales y no produce beneficio económico alguno a sus editores. ________________________________________________________________________________________________________________________________________ ASOCIACIÓN DE MAESTROS DE CIENCIA DE PUERTO RICO JUNTA DE DIRECTORES 2005-2006 Presidenta Prof. Lizzette Colón Presidenta electo Jacqueline López Presidenta saliente Prof. Edwin Carrasquillo Sub-secretaria Prof. Tere de Lourdes Hernández Secretaria ejecutiva Prof. Lucy Gaspar Tesorero Prof. Jorge L.Acosta REPRESENTANTES DE CAPÍTULOS REGIONALES Arecibo Prof. Mayra Colón/Prof. Camille Valle Bayamón Prof. Linda B. Santiago/Prof. Carmen G. Martínez Caguas Prof. Carmen Reyes Fajardo Prof. Elizabeth Pabón/Prof. Elena Hernández/ Prof.Marisol Esquilín Humacao Prof. Tere de Lourdes Hernández Mayagüez Prof. Rosa M. Batista/Prof. Samanta Chardón Morovis Prof. Jorge L. Acosta/Prof. Noel Cuevas Ponce Prof. Frances Nadal/Prof. Jacqueline Mattei San Germán Prof. Lucy Ramírez/Prof. Gladys E. Cruz San Juan Vacante MIEMBRO EX-OFICIO MIEMBRO HONORABLE Prof. Luis Jiménez Prof. Alice El Koury COMITÉ ASESOR COLABORADORES Dr. Herminio Lugo Lugo Dra. Elena Maldonado Dr. Héctor Joel Álvarez Dra. Marta Fortis Dra. María Aguirre Dra. Josefina Arce Prof. Acenet Bernacet Dr. Ariel E. Lugo Para comunicarse con la Asociación de Maestros de Ciencia o subscribirse a Acta Científica comuníquese con: Prof. Lizzette Colón Asociación de Maestros de Ciencia Apartado 22044, Estación UPR San Juan, Puerto Rico 00931 Acta Científica 17(1-3):1, 2003 EDITORIAL _________________________________________________________________________________ Como es costumbre en esta revista, este volumen de Acta contiene una variedad amplia de tópicos. El primer ensayo contiene una síntesis histórica de las actividades de conservación en Puerto Rico. Como allí se demuestra, el país se encuentra en un momento de crisis al estar en juego el futuro de los recursos naturales no-patrimoniales, como lo son el agua y la zona marítimo-terrestre. Es imperativo que los maestros de ciencia entiendan la naturaleza del patrimonio público y su relación con la salud pública y la calidad de vida. La conservación depende ahora, y dependerá más y más en el futuro, de las actitudes y acciones de ciudadanos académicamente preparados y conocedores de lo que es el patrimonio natural de Puerto Rico y de cómo funciona. Dos de las cuatro contribuciones del historiador Carlos M. Domínguez Cristóbal demuestran la importancia histórica de dos bosques públicos de la Isla. Por un lado, se documenta el uso económico del Bosque Seco de Guánica y por otro, las circunstancias que apoyan la repatriación de los manglares en la base naval de Roosevelt Roads. El científico norteamericano Frederick N. Scatena presenta las razones para incorporar el bosque los Tres Picachos al sistema de bosques estatales de Puerto Rico. Las áreas protegidas en Puerto Rico sólo suman siete por ciento del territorio e impera mantener un ojo avizor para aumentar el acervo natural formalmente protegido por ley como patrimonio público de Puerto Rico. La conservación de los bosques tiene valor económico, además de su valor ecológico. Esto lo demuestran dos artículos en este número de Acta. Primero, Frederick N. Scatena presenta el valor económico del bosque los Tres Picachos y segundo, Summer C. Kartcher presenta los resultados de encuestas sobre el uso recreativo del Bosque Nacional del Caribe (el Yunque). Este trabajo es particularmente informativo por la información que se obtuvo de las personas que se recrean en los ríos y quebradas del bosque. Finalmente, le expresamos nuestro profundo agradecimiento a Irma Ivette Quiñones Maurás por su continuo apoyo a Acta Científica. Este número contiene su índice para los volúmenes 11 al 15. Gracias a Irma, hemos publicado índices para los primeros 15 volúmenes de Acta Científica. Ariel E. Lugo Editor Acta Científica 17(1-3):3-9, 2003 MANTO DE OSCURIDAD NOCTURNA: PATRIMONIO NATURAL OLVIDADO Olga M. Ramos Instituto Internacional de Dasonomía Tropical Servicio Forestal del Departamento de Agricultura de los Estados Unidos de América 1201 Calle Ceiba, Jardín Botánico Sur, Río Piedras, Puerto Rico 00926-1119 INTRODUCCIÓN montañosa del El Yunque. En este último paso y para generar las vistas del artículo utilizamos el Desde finales de los 90, un grupo de programa de sistemas de información geográfica investigadores de la NOAA y la NASA utiliza ArcGIS 9.0 y el procesador de imágenes digitales imágenes satelitales para captar el resplandor de las Erdas Imagine 8.7. Las imágenes originales están luces nocturnas proveniente de fuentes artificiales accesibles en http://www.ngdc.noaa.gov/dmsp/ en la superficie terrestre (NGDC-NOAA 2006). download_world_change_pair.html. Esto ha permitido obtener impresionantes vistas nocturnas del planeta que muestran, por primera vez, DEFINICIONES cómo las actividades humanas iluminan la noche, dibujando contornos de luz que conectan continentes, Se define la
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