Coral Island : for soprano and orchestra

Digitoitu 10. 6. 2008.

The Genus Herposiphonia (Ceramiales, Rhodophyta) in the Coral Reefs Environmental Protection Area, Northeastern Brazil, with new records for Brazil and the Atlantic Ocean

This paper presents a taxonomic study of taxa of the red algae genus Herposiphonia (Ceramiales) occurring on Maracajaú Reef in the Coral Reefs Environmental Protection Area (CREPA - Área de Proteção Ambiental dos Recifes de Corais) in Rio Grande do Norte State, along the northeastern coast of Brazil. The CREPA comprises coastline and continental shelf areas of the municipalities of Touros, Rio do Fogo, and Maxaranguape and includes sand dunes, coastal lagoons, and the adjacent shoreline and offshore reefs. Detailed morphological studies were made, considering recent taxonomic criteria for species delimitation of Herposiphonia, and five species were identified: H. delicatula, H. nuda, H. parca, H. secunda, and H. tenella, thus increasing the number of species in the genus from three to six. Herposiphonia delicatula and H. parca represent new occurrences for Brazil, and H. nuda is reported for the first time for the Atlantic Ocean.

Flow injection analysis (FIA) determination of lead by hydride generation in banded coral skeletons /

A flow injection hydride generation direct current plasma atomic emission spectrometric (FI-HG-DCP-AES) method was developed for the determination of lead at ng.ml-l level. Potassium ferricyanide (K3Fe(CN)6) was used along with sodium tetrahydroborate(III) (NaBH4) to produce plumbane (PbH4) in an acid medium. The design of a gas-liquid separator (hydride generator) was tested and the parameters of the flow injection system were optimized to achieve a good detection limit and sample throughput. The technique developed gave a detection limit of 0.7 ng.ml-l(3ob). The precision at 20 ng.ml"* level was 1.6 % RSD with 1 1 measurements (n=l 1). Volume of sample loop was 500 |J.l. A sample throughput of 120 h"^ was achieved. The transition elements, Fe(II), FeOH), Cd(n), Co(II), Mn(n), Ni(II) and Zn(n) do not interfere in this method but 1 mg,l'l Cu(II) will suppress 50 % of the signal from a sample containing 20 ng.ml'l Pb. This method was successfully applied to determine lead in a calcium carbonate (CaC03) matrix of banded coral skeletons from Si-Chang Island in Thailand.

Temporal variation in the coral reefs of the east coast of the inner gulf of Thailand

A series of permanent line transects established on fourteen reefs on the eastern seaboard of the Gulf of Thailand were monitored through a three-year period (1995- 1998) using a video transect method. Hierarchical cluster analysis shows three distinctive reef community types dominated by 1) Porites, 2) Acropora and 3) zoantharians. The reefs are developed under naturally turbid conditions and relatively low salinity due to the proximity of four major river outlets located in the uppermost area of the gulf. The number of Acroporid species on the reefs is positively correlated with distance from the major flver outlets. Eighty-seven species of scleractinian coral were found on the transects. Over the three-year period, the comparison of 1995-97-98 matched stations using Repeated Measures ANOV A reveals no significant time-dependent change in percent area cover of reef components except for an overall significant reduction in the faviid coral component. In the 1997-98 matched station comparison, statistical tests reveal significant increases in both Acropora and Porites components that translated into an overall increase in total living coral cover. These findings indicate that the overall environmental conditions have been favorable for coral growth. Outcompetition of massive corals by faster growing corals on several reefs also indicates conditions favorable for reef expansion. Growth of newlyformed Porites colonies over primary rock substrate and dead coral skeleton was presumably responsible for its rapid increase. Although these reefs are in an area of rapid industrialization and population growth, resultant anthropogenic effects have not yet stopped active coral accretion.

Transposable Elements Are a Significant Contributor to Tandem Repeats in the Human Genome

Sequence repeats are an important phenomenon in the human genome, playing important roles in genomic alteration often with phenotypic consequences. The two major types of repeat elements in the human genome are tandem repeats (TRs) including microsatellites, minisatellites, and satellites and transposable elements (TEs). So far, very little has been known about the relationship between these two types of repeats. In this study, we identified TRs that are derived from TEs either based on sequence similarity or overlapping genomic positions. We then analyzed the distribution of these TRs among TE families/subfamilies. Our study shows that at least 7,276 TRs or 23% of all minisatellites/satellites is derived from TEs, contributing ∼0.32% of the human genome. TRs seem to be generated more likely from younger/more active TEs, and once initiated they are expanded with time via local duplication of the repeat units. The currently postulated mechanisms for origin of TRs can explain only 6% of all TE-derived TRs, indicating the presence of one or more yet to be identified mechanisms for the initiation of such repeats. Our result suggests that TEs are contributing to genome expansion and alteration not only by transposition but also by generating tandem repeats.

Fundamentos en la aplicación de relevadores de protección en sistemas eléctricos de potencia [por] Paz Vicente Cantú Gutiérrez

Tesis (Maestría en Ciencias de la Ingeniería Eléctrica, con especialidad en Potencia) U.A.N.L.

Implementación de un plan de desarrollo organizacional aplicación para Sisteleón [por] Enrique Cantú Morales.

Tesis (Maestría em Administración de la Construcción) U.A.N.L.

Determinación del nivel de vida por municipio en el estado de Nuevo León [por] Pedro César Cantú Martínez

Tesis (Maestría en Salud Pública) U.A.N.L.

Desarrollo de un curso de control electrónico de motores por Guadalupe Ignacio Cantú Garza

Tesis (Maestría en Ciencias de la Ingeniería Eléctrica con Especialidad en Control) U.A.N.L.

Propuesta didáctica influencia de las habilidades docentes y académicas en la mejoría de la calidad del aprendizaje de matemáticas I [por] Juan Héctor Cantú Cantú

Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Matemáticas) U.A.N.L.

Manual de histología estrategia didáctica en la enseñanza para el nivel superior [por] Elsa María Tamez Cantú

Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Biología) U.A.N.L.

Propuesta didáctica una estrategia didáctica para el aprendizaje de la nomenclatura química inorgánica en el nivel medio superior [por] Griselda Cantú Morales

Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Química) U.A.N.L.

Metodología para impartir los contenidos del tema de evolución en nivel medio superior de la U.A.N.L. [por] Patricia Domínguez Cantú

Tesis (Maestría en la Enseñanza de las Ciencias con Especialidad en Biología) U.A.N.L.

Anteproyecto de implementación de la carrera de Ingeniero en Manufactura en la Facultad de Ingeniería Mecánica y Eléctrica de la U.A.N.L. por Amelia González Cantú.

Tesis (Maestría en Ciencias de la Administración con Especialidad en Relaciones Industriales) U.A.N.L.