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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 32 (1987), S. 417-423 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We discuss the solution of the integral Dirac-Fock equation in momentum space. “Balanced” momentum-space gaussian functions are used to expand the large and small components of the Dirac 4-spinors. We show that this approach, which has been successfully used in atomic Dirac-Fock calculations, works equally well in molecular Dirac-Fock calculations.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 34 (1988), S. 445-456 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A major impediment to achieving accurate solutions of the momentum-space Hartree-Fock equation in fully numerical form lies in the error caused by the truncation of momentum space. We use a coordinate transformation, which is characterized by P = tan(α/2), thus avoiding this truncation to achieve accurate solutions of the Hartree-Fock equation. Using this approach, we have re-examined the He model problem previously analyzed by Delhalle and Defranceschi [Intern. J. Quantum Chem. Symp. 21 425 (1987)]: The kinetic, nuclear attraction and Coulomb repulsion energies of the He atom have been evaluated using both conventional spherical polar momentum coordinates, (p, θ, ϕ) and the transformed coordinates, (α,θ,ϕ) in order to compare their accuracies. We have performed a number of fully numerical calculations on the H+2 ion in order to examine the influence of the number of points in the mesh on the accuracy of the computed total electronic energy of the diatomic molecule.
    Additional Material: 2 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 40 (1991), S. 107-111 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We discuss the solution of the time-dependent Schrödinger equation. The split operator method is used to propagate an initial wave function and the continuous Fourier transform is applied to obtain the energy eigenvalues. High resolution in the energy is obtained without line shaping techniques.s
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2011-02-28
    Electronic ISSN: 1932-6203
    Topics: Medicine , Natural Sciences in General
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  • 5
    Publication Date: 1988-05-01
    Print ISSN: 0009-2614
    Electronic ISSN: 1873-4448
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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  • 6
    Publication Date: 1988-01-01
    Print ISSN: 0009-2614
    Electronic ISSN: 1873-4448
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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  • 7
    Publication Date: 2021-05-19
    Description: Se realizan las primeras experiencias exitosas de maduración y desove inducido del robalo blanco (Centropomus undecimalis, Bloch, 1792). El proceso reproductivo estuvo basado en la combinación de estimulación ambiental (control de temperatura, salinidad, fotoperiodo y fases lunares de luna nueva y luna llena) con el empleo de compuestos hormonales. un total de 27 reproductores de ambos sexos mantenidos durante seis años en un tanque de concreto de 70 m3, fueron sometidos a tratamiento hormonal con gonadotropina Coriónica Humana (gCH) en dosis de 500 U.I./kg desfasados en el tiempo. Los pesos en los machos oscilaron entre 1,82 kg y 2,93 kg y en las hembras entre 2,95 kg y 4,22 kg. En el tratamiento I todas las hembras mostraron ovocitos en desarrollo y desovó el 71 % de estas. En el resto de los tratamientos, entre el 9 % y 18 % presentaron ovocitos y solamente desovó entre 8,3 % y 16,7 %. Se obtuvo un total de 1,4 millones de larvas. La fertilización de los huevos osciló entre 53,6 % y 100 %, mientras que la tasa de eclosión varió entre 78,3 % y 100 %. Se obtuvieron desoves en ambas fases lunares pero con mejores índices durante la luna nueva. La disminución de alimento para maduración y desove durante 15 días antes de la inyección, no afectaron los desoves.
    Description: First experiences on maturation and spawning induced on common snook Centropomus undecimalis, Bloch 1792) were carried out. Reproductive process was based on the combination of both environmental stimulation (temperature, salinity, photoperiod and lunar phases) and hormonal compound for the invasive action. A total of 27 bloodstock of both sexes maintained in a concrete tank of 70 m3 during six years were treated with 500 U.I./kg of Human Chorionic Gonadotropic (HCG) in four times. Fish weight oscillated between 1,82 kg and 2,93 kg and from 2,95 kg to 4,22 kg males and females respectively. In the first experience, females showed oocytes in development and 71 % were spawned. Oocytes between 9 % and 18 % were obtained in the rest of treatments and just 8,3 % and 16,7 % were spawned. A total of 1,4 million larvae were obtained. Viability of eggs oscillated between 53,6 % and 100 %, while hatch rate varied between 78,3 % and 100 %. Spawning in both lunar phases was obtained but better productive index during new moon phase were observed. Decreasing supplying of food 15 days before injection plan did not affect the spawning.
    Description: Published
    Keywords: Desove ; Robalo ; Hormonas ; Spawning ; Common snook ; Hormone
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.11-16
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  • 8
    Publication Date: 2021-05-19
    Description: Durante la fase de primera alimentación, la capacidad de la boca de las larvas restringe mecánicamente el tamaño de las partículas alimenticias que pueden ser ingeridas. En este contexto, los huevos y la larva trocófora del ostión de mangle Crassostrea rizophorae se presentan como adecuados candidatos por sus dimensiones y calidad nutricional. Para determinar la factibilidad de inclusión de estos en la alimentación temprana del pargo criollo Lutjanus analis, se tomaron muestras aleatorias de 50 huevos y 50 larvas trocóforas de ostión de mangle C. rhizophorae que fueron medidas y, consecuentemente, se tomó una muestra de 50 larvas de pargo al segundo día posteclosión (d.p.e.), cuyas aberturas bucales fueron medidas. Se encontró que el tamaño de los huevos fue de 39,2 +- 2,2 m, las larvas trocóforas de 51,96  9,1 m y la amplitud bucal de las larvas de pargo fue de 78,5 +- 11,7 m. Se discute acerca de las características nutricionales, morfológicas y económicas de esta nueva fuente de alimentación en comparación con el tradicional usado en esta etapa. Se incluyen los huevos y larvas de ostión dentro del esquema nutricional larval del pargo y su aplicación durante 2012.
    Description: During the first feeding, the size of the mouth of the larvae restricts mechanically the size of the food particles that can be ingested. In this context, eggs and first larvae stage of the mangrove oyster Crassostrea rizophorae presented as an appropriate candidate by its dimensions and nutritional quality. In order to determine the inclusion feasibility of both kind of food in the early feeding of mutton snapper Lutjanus analis, random samples of 50 eggs and 50 trocophore larvae of mangrove oyster C. rhizophorae were took. They were measured and consequently, a sample of 50 mutton snapper larvae at the second day post hatch (d.p.h.) were took and its openings mouth were measured. Size of eggs was 39,2  2,2 m; trocophore larvae of 51,96 +- 9,1  m and mouth width of mutton snapper larvae was 78,5 +- 11,7 m. Eggs and oyster larvae inside the mutton snapper larvae nutritional outline and their application during 2012 was presented.
    Description: Published
    Keywords: Ostión ; Trocófora ; Larvas ; Alimentación ; Pargo ; Oysters ; Trocofore ; Larvae ; Snapper feeding
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-6
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  • 9
    Publication Date: 2021-05-19
    Description: La explotación sostenida de los recursos pesqueros es un reto global y particularmente para Cuba con una estrecha plataforma insular donde tiene lugar el 95 % de las capturas, y cuyos recursos se encuentran al máximo nivel de explotación (Claro, 2001). El maricultivo se presenta como una alternativa viable capaz de mitigar significativamente el negativo impacto de la sobrepesca. A partir de la estandarización de los desoves de pargo criollo Lutjanus analis, en 2012 se establece la biotecnología del cultivo de peces de esta especie después de cinco años de trabajo y se obtienen alevines por primera vez en Cuba. Esta primera producción estuvo dirigida a la renovación y permanencia de los inventarios naturales de esta especie autóctona a través de la liberación controlada de las semillas al medio natural, y a la conformación de un nuevo banco de reemplazo para prescindir de la captura de adultos.
    Description: Sustainable exploitation of fishing resources is a global challenge, especially for Cuba with a narrow insular shelf where it takes place a 95 % of capture and its resources at the maximum level of exploitation (Claro, 2001). Mariculture is presented like a viable alternative to mitigate significantly the negative impact of the overfishing. From the Mutton Snapper Lutjanus analis spawning standardization after five year, in 2012 marine fish biotechnology cultivation was settled down. For the first time in Cuba, fingerling was obtained. This first production was aimed to the renovation and permanency of the natural stocks of this native species through the controlled release of the seeds to the wild and the establishment of a new broodstock to dispense adults capture from the wild.
    Description: Published
    Keywords: Pargo ; Maricultivo ; Educación ambiental ; Mutton snapper ; Mariculture ; Environmental education
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.55-60
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  • 10
    Publication Date: 2021-05-19
    Description: Este estudio estuvo dirigido a la determinación de la disponibilidad, cantidad y etapas de desarrollo de los tipos de copépodos más importantes presentes en la piscina de sedimentación para su inclusión en el esquema alimentario larval de pargos, como solución al déficit del alimento vivo tradicional. Se cuantificó un valor promedio de 7,5 x 10 5 individuos por noche de todas las especies y tamaños. Se describe el método de colecta y selec-ción de estos organismos. Dentro de la Clase Crustacea, se identificaron tres grandes grupos (Órdenes) más abundantes (Cyclopoida, Calanoida y Harpacticoida). Los organismos fueron separados por rangos de tallas para el consumo de las larvas según su desarrollo ontogénico. Se discuten formas de incrementar los volúmenes de captura en correspondencia con el aumento de la demanda alimentaria durante la fase de cría larval, entre otros aspectos.
    Description: This study was aimed to determine the availability, quantity and development stages of the most important types of copepods present in the sedimentation pool in order to include in the mutton snapper larval feeding scheme as a solution to the deficit of traditional live food. Average catch of 7,5 x 10 5 individual/sample was observed. Collecting method and selection of these organisms are described. Within Class Crustacea, three main groups (Orders) more abundant (Cyclopoida, Calanoida and Hapacticoida) were identified. Organisms were separated by size range for consumption of larvae according to ontogenetic development. Ways to enhance catch in correspondence of increasing food demand during the larval rearing phase, among other aspects, are discussed.
    Description: Published
    Keywords: Lutjanus analis ; Mutton snapper ; Copépodos ; Alimentación larval ; Pargo ; Copepods ; Larval feeding
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp. 7-11
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