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Estudios preliminares de las características espermáticas y de criopreservación del coral formador de arrecifes Orbicella faveolata. Boletín de Investigaciones
0000-0002-0125-0728,María Juliana Vanegas; 0000-0002-0161-3074,Valeria Pizarro.
RESUMEN La criopreservación ha sido recientemente aplicada a gametos y tejidos coralinos obteniendo resultados exitosos que pueden ser utilizados para la conservación y la restauración de arrecifes de coral. En este artículo, se determinó la morfología espermática del coral Orbicella faveolata y la viabilidad de la criopreservación del esperma utilizando una combinación de crioprotectores intracelulares (1,2-Propadiol) y extracelulares (leche) en dos tratamientos de congelación durante 24 h. Los espermatozoides maduros tienen una cabeza con forma triangular de 4.10 ± 0.69 µm (promedio ± DS) y un flagelo largo ( 43.24 ± 7 .99 µ m). El esperma fresco permanece viable y motil por más de cinco horas después de ser liberado de las bolsas gaméticas. Todos los...
Tipo: Journal article Palavras-chave: Orbicella faveolata; Parque Nacional Natural Tayrona; Reproducción sexual; Gametos de coral; Morfología.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000200025
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Estructura de la comunidad bacteriana en diferentes tejidos de Lobatus gigas silvestres (Linnaeus, 1758) de la Reserva de Biosfera Seaflower del Caribe Boletín de Investigaciones
0000-0002-4031-4931,Mónica Marcela Higuita-Valencia; 0000-0002-4820-0381,Olga Inés Montoya-Campuzano; 0000-0003-0760-3747,Edna Judith Márquez-Fernández; 0000-0002-8132-5223,Claudia Ximena Moreno-Herrera.
RESUMEN La diversidad microbiana de Lobatus gigas no se ha estudiado a fondo a pesar de que se trata de una especie en peligro de extinción. El conocimiento de la microbiota puede ayudar a mejorar la conservación y el cultivo de esta especie. El objetivo de este estudio fue evaluar las poblaciones bacterianas asociadas con la gónada y en los compartimentos intestinales de L. gigas en peligro de extinción de la Reserva de la Biosfera Seaflower del Caribe, utilizando métodos microbiológicos y herramientas moleculares independientes del cultivo. Se generaron los perfiles genéticos de las poblaciones bacterianas y se utilizó la Electroforesis Gradual de Gradiente de Temperatura (TTGE) para compararlos con el ADN total. Un análisis genético y estadístico de las...
Tipo: Journal article Palavras-chave: Lobatus gigas; Gen RNAr 16S; Comunidad Bacteriana; Gónada; Intestino.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612018000200037
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DISTRIBUCIÓN ESPACIAL Y TEMPORAL DE LA PRECIPITACIÓN Y LA HUMEDAD DEL SUELO EN TRES SITIOS FORESTALES DE LA VIII REGIÓN DE CHILE Agricultura Técnica
A. Bonilla,Carlos; Bonomelli,Claudia; Urrutia,Gonzalo.
En Chile existen alrededor de dos millones de hectáreas con plantaciones forestales, destacándose la VIII Región, por sus favorables condiciones climáticas. Considerando la importancia que tiene el régimen hídrico sobre estas especies, el objetivo de este estudio fue caracterizar las precipitaciones y humedad del suelo en tres sitios representativos de las condiciones de Secano Costero, Valle Central y Precordillera de la región. Los sitios empleados se ubican entre los 37°00 y 37°45’ lat. Sur y 72°00 y 73°10’ long. Oeste. Desde septiembre de 1993 y hasta agosto de 1996 se registraron las temperaturas, precipitación y contenido de humedad del suelo en cada sitio. Los resultados indican que la precipitación mensual en el sitio de Precordillera no fue...
Tipo: Journal article Palavras-chave: Eucalyptus spp.; Hidrología forestal; Balance hídrico; Disponibilidad de agua en el suelo.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000400006
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Finite size scaling in the local abundances of geographic populations Biol. Res.
Abades,Sebastián R; Marquet,Pablo A.
We analyzed the statistical distribution of intra-specific local abundances for a set North American breeding bird species. We constructed frequency plots for every species and found that they showed long-tail power-law behavior, truncated at an upper abundance cut-off value. Based on finite size scaling arguments, we investigated whether frequency curves may be considered scaled copies of each other. Data collapse was possible after taking powers of the total abundance of each species, in order to correct deviations from the underlying universal finite size scaling function (UFSS). The UFSS power law exponent oscillated in time within the regime of unbounded variance, which is consistent with the wild fluctuations that characterize ecological phenomena....
Tipo: Journal article Palavras-chave: Finite size scaling; Geographic population; Data collapse; Truncated power-law; Bose-Einstein distribution; Scaling.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602011000100013
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A Quantitative Assessment of the Morphological Characteristics of BeWo Cells as an in vitro Model of Human Trophoblast Cells International Journal of Morphology
Abaidoo,C.S; Warren,M. A; Andrews,P. W; Boateng,K. A.
In order to study the detailed morphology of trophoblast cells during human implantation, BeWo cells were cultured as spheroids in suspension culture. These cultures were then processed for light and electron microscopical examination. The present study showed that the BeWo spheroids consist of two cell types which are cytotrophoblast-like and syncytiotrophoblast-like. The cells with larger nuclear diameter made up only about 1% of the cell population and appear to be those of syncytiotrophoblast. Therefore the predominant cell type of the BeWo spheroids appeared to be relatively undifferentiated and cytotrophoblast-like. About 10% of the BeWo cells in the present study were mitotic, indicating a highly proliferative population. Total cell number increased...
Tipo: Journal article Palavras-chave: BeWo; Trophoblast; Morphometry; Spheroids.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400011
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EVALUACIÓN DE PLANTAS con propiedades NEMATICIDAS EN EL CONTROL DE Xiphinema index EN VID DE MESA CV. THOMPSON SEEDLESS EN LA ZONA CENTRAL DE CHILE Agricultura Técnica
Aballay E.,Erwin; Insunza B.,Violeta.
Xiphinema index Thorne and Allen es un nemátodo ectoparásito económicamente importante en la vid ( Vitis vinifera L.) en Chile, como patógeno de las raíces y como vector del "virus de la hoja en abanico" (GFLV) en vides. El control tradicional se ha hecho básicamente con productos químicos, de efectos erráticos y muy cuestionados por sus efectos ambientales. El objetivo de este trabajo fue evaluar en vides cv. Thompson Seedless el efecto nematicida de ocho plantas antagónicas en el control de Xiphinema index. Las plantas antagónicas se cultivaron en la líneas de plantación y se incorporaron como abono verde. Las especies ensayadas fueron: raps (Brassica napus L.), caléndula (Calendula officinalis L.), cosmos (Cosmos bipinnatus Cav.), gaillardia (Gaillardia...
Tipo: Journal article Palavras-chave: Alelopatía; Plantas antagonistas; Cultivos de cobertera; Abono verde; Manejo integrado de plagas; Plantas nematicidas; Raps.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000300002
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Tolerance of some Grapevine Rootstocks to Tylenchulus Semipenetrans Cobb 1914 in Chile Agricultura Técnica
Aballay,Erwin; Navarro,Alejandra.
Grapevine (Vitis vinifera L.) rootstock resistance to Tylenchulus semipenetrans Cobb 1914 was tested in a field trial carried out in a pre-established grapevine crop. Tested rootstocks included VR O39-16, 420 A, Kober 5BB, 110 Richter, Harmony, Couderc 1613, Ramsey and SO4. Cultivar Cabernet Sauvignon was used as a control. A soil analysis was made at planting in 1995, and a second soil and root analysis was made in 2000 to assess the presence of juveniles and adult females. The most resistant rootstocks were Ramsey and 110 Richter; the others were similar to the control.
Tipo: Journal article Palavras-chave: Rootstocks; Grapevines; Resistance; Parasitic nematodes.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000300010
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Resistance assessment of grapevine rootstocks used in Chile to the root-knot nematodes Meloidogyne ethiopica, M. hapla, and M. javanica Ciencia e Investigación Agraria
Aballay,Erwin; Vilches,Oscar.
The rootstocks 1103 P, 101-14, K 5BB, SO4, and 3309 were assessed to determine their resistance to the three common Meloidogyne species present in Chilean vineyards, M. ethiopica, the most frequent species, M. hapla and M. javanica. Their response was compared to three ungrafted cultivars, Thompson Seedless, Pinot Noir and Chardonnay. To perform this study, two month-old plants produced from cuttings were inoculated with 5,000 eggs per 3-L pots, filled with steamed substrate and kept in a glasshouse covered with a black mesh to intercept 30% of sun light and avoid heating of the substrates. After a growth period of six months, plants were removed from the pots, and resistance was determined by measuring root weights, the number of galls and eggs per g of...
Tipo: Journal article Palavras-chave: Plant-parasitic nematodes; Root pests; Vitis vinifera; Vineyards.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300009
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Nutrient contents in camu-camu plants (Myrciaria dubia (Kunth) McVaugh) fertirrigateds with different doses of nitrogen Acta Agron. (Palmira)
Abanto-Rodríguez,Carlos; Chagas,Edvan Alves; da Silva Siqueira,Raphael Henrique; Araújo,Wellington Farias; Zborowski,Luiz Guilherme Carvalho; Souza,Caio César Pinho; Sakasaki,Roberto Tadashi; Lopes Monteiro Neto,João Luiz; Sánchez-Choy,José.
Abstract Camu-camu (Myrciaria dubia (Kunth) McVaugh) is a native fruit tree, which is in domestication process, therefore, knowledge of nutritional needs is essential to improve the fertilization efficiency throughout plant development. The aim of this research was to determine the nutrient content of camu-camu plants as a function of nitrogen fertilization via fertirrigation in the first year of cultivation. An experiment was carried out in a randomized complete block design, with 5 treatments as follows: 0; 40; 80; 120 and 160 kg.ha-1 of N, eight replicates and seven plants per experimental unit. The evaluated variables were as follows: total dry matter and nutrient contents in camu-camu leaves. The results show total dry matter of camu-camu plants,...
Tipo: Journal article Palavras-chave: Dry matter; Micronutrients; Nutrient balance (plants); Plant development; Plant nutrition.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100079
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Assessment of Mesial Root Morphology and Frequency of MB2 Canals in Maxillary Molars using Cone Beam Computed Tomography International Journal of Morphology
Abarca,J; Gómez,B; Zaror,C; Monardes,H; Bustos,L; Cantin,M.
The aim of this study was to assess the morphology of the mesial root canal system of maxillary molars and the frequency of MB2 canals using cone-beam computed tomography (CBCT). A total of 1374 teeth, first maxillary (1MS, n= 802) and second maxillary molars (2SM, n= 572) of 508 Chilean patients between 8 to 77 years were evaluated through CBCT. The mesiobuccal root was evaluated in all three thirds. Root canal morphology was classified according to Vertucci's method. Data were analyzed by Pearson's Chi-square and Cuzick trend tests. MB2 canal frequency in 1MS was 73.44% and in 2MS 42.48%. The most frequent morphology in 1MS and 2MS were Vertucci type II and I, respectively. No statistically significant association was found between frequencies and side...
Tipo: Journal article Palavras-chave: CBCT; Secondary mesiobuccal canal; MB2; Maxillary molars; Root canal system.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400023
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Morphology of the Physiological Apical Foramen in Maxillary and Mandibular First Molars International Journal of Morphology
Abarca,J; Zaror,C; Monardes,H; Hermosilla,V; Muñoz,C; Cantin,M.
Information regarding the anatomy of the physiological apical foramen is limited. Knowing its diameter and shapes contributes to clinical work, specifically to the cleaning and shaping of the apical third. The aim of this ex vivo study was to determine the minimum and maximum diameters and shape of the physiological apical foramen in the roots of maxillary and mandibular first molars. A descriptive study was conducted on 89 recently extracted first molars. Roots 3-5 mm from the apex were sectioned and prepared for analysis at 40x magnification. The minimum and maximum diameters of each physiological foramen were measured using the program Motic Images plus 2.0 ML. The shape of the foramina, classified as round, oval or irregular, was determined by the...
Tipo: Journal article Palavras-chave: Physiological Foramen; Apical constriction; Root apex; Apical diameter; Foraminal morphology; Permanent first molar.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200048
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A Comparative Histological Study of the Tongue of Rat (Rattus Norvegicus), Bat (Eidolon Helvum) and Pangolin (Manis Tricuspis) International Journal of Morphology
Abayomi,Taiwo A; Ofusori,David A; Ayoka,Oladele A; Odukoya,Samson A; Omotoso,Emmanuel O; Amegor,Frank O; Ajayi,Sunday A; Ojo,Gideon B; Oluwayinka,Oladele P.
This study assessed the micro anatomical differences in the tongue of rat, bat and pangolin with a view to establishing the functional anatomical differences of these mammalian tongues on their dietary pattern. Ten rats, ten bats and ten pangolins were used for this study. The animals were sacrificed and the tongue excised and processed for light microscopical study adopting the following stains: Haematoxylin Eosin, Verhoeff Gieson and Masson trichrome. The results showed non papillation of the keratinized stratified epithelium of pangolin tongue unlike the papillation seen in the tongue of the rat and bat. While the filiform papillation seen in the rat was bristle like, the filiform papillae in the bat were crown-like. There was also an unusual dense...
Tipo: Journal article Palavras-chave: Rat; Bat; Pangolin; Tongue; Micro-anatomy.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000400026
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Historia natural del piche llorón Chaetophractus vellerosus (Mammalia: Xenarthra: Dasypodidae) RChHN
ABBA,AGUSTÍN M; CASSINI,GUILLERMO H; CASSINI,MARCELO H; VIZCAÍNO,SERGIO F.
En este trabajo se presentan nuevos aportes sobre la historia natural del piche llorón Chaetophractus vellerosus (Mammalia: Xenarthra: Dasypodidae). Los estudios de campo fueron llevados a cabo en 100 ha de un establecimiento ganadero de la localidad de Magdalena, provincia de Buenos Aires, Argentina. Durante dos años (2006-2008) se realizó un muestreo estacional de armadillos por captura y recaptura. Se obtuvieron datos de hábitos alimentarios, uso del espacio y del tiempo, comportamiento, termorregulación, datos poblacionales y morfológicos. Se realizaron 237 capturas de un total de 136 individuos. En la dieta el ítem principal registrado fue insectos coleópteros, seguido por material vegetal y pequeños mamíferos; se observó una diferencia estacional en...
Tipo: Journal article Palavras-chave: Armadillos; Buenos Aires; Conservación; Ecología.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100004
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Effects of the foliar application of methanol on the yield and growth of rice (Oryza sativa cv. Shiroudi) Ciencia e Investigación Agraria
Abbasian,Abouzar; Mirshekari,Bahram; Safarzade Vishekaei,Mohammad N; Rashidi,Varahram; Aminpanah,Hashem.
Effects of the foliar application of methanol on the yield and growth of rice (Oryza sativa cv. Shiroudi). Cien. Inv. Agr. 43(1):17-24. Approximately two decades have passed since it was reported that the foliar application of methanol increased plant biomass and yield. Many subsequent reports have been published concerning the ability or inability to reproduce these initial observations. To evaluate the effect of methanol on rice (Oryza sativa cv. Shiroudi) yield and rice components, a field experiment was conducted at the Tonekabon Rice Research Station in Iran in 2012 and 2013. The experiment had a randomized complete block design (RCBD) with three replicates. The plants were treated with aqueous methanol solutions (0, 6, 12, 18, and 24% (v/v))....
Tipo: Journal article Palavras-chave: Aqueous methanol solution; Correlation; Glycine; Grain yield; Growth; Rice; Tween 80 as a surfactant.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100002
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Análisis de coeficientes de sendero para el rendimiento de semillas en Bromus catharticus Ciencia e Investigación Agraria
Abbott,Liliana A; Pistorale,Susana M; Filippini,Olga S.
Trece genotipos de Bromus catharticus (cebadilla criolla) fueron evaluados para rendimiento en semilla en 2001 y 2002, usando un diseño completamente aleatorizado con seis repeticiones por genotipo. Se analizaron las correlaciones y el coeficiente de sendero para nueve caracteres relacionados con la producción de semilla. La variabilidad genotípica fue estadísticamente significativa para número de semillas totales por panoja en el segundo año (p = 0,019), largo de hoja bandera en los dos años (p = 0,039 y 0,045) y número de macollos por planta en el primer año (p = 0,003). La interacción genotipo x ambiente fue significativa para número de macollos por planta (p = 0,003), número de panojas por planta (p = 0,010), ancho de hoja bandera (p = 0,010) y peso de...
Tipo: Journal article Palavras-chave: Cebadilla criolla; Componentes del rendimiento; Correlaciones fenotípicas.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200007
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Stability analysis of forage production in Bromus catharticus (prairie grass) using three methodologies Ciencia e Investigación Agraria
Abbott,Liliana; Filippini,Susana; Delfino,Hugo; Pistorale,Susana.
Thirteen genotypes of Bromus catharticus (prairie grass) were evaluated for forage production over three years using completely randomized trials with six replicates. The genotype x environment interaction was statistically significant and indicates that the behavior of genotypes differs over time. Once this interaction was detected, we used three methodologies to assess the stability of genotypes: Wricke's ecovalence, the Lin and Binns index, and the Eberhart and Russell model. The methods of Lin and Binns and Eberhart and Russell indicate that genotypes 11, 9, 3 and 4 are stable. They also rule out possible selection of genotypes 2, 10, 1 and 12 for lack of stability or poor adaptation. The correlation among these indices was statistically significant...
Tipo: Journal article Palavras-chave: Bromus; Forage production; Genotype-environment interaction; Phenotypic stability; Prairie grass.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000200009
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Reversible Effect of High Altitude on Rat Testis Morphology and Spermatogenesis: Histological and Ultrastructural Study International Journal of Morphology
Abdalla,Asim M; Tingari,M. D; Ali,K. Z; Rezigalla,A. A; Al-shraim,Mubarak; Eid,Refaat, A.
The study was carried out at two different altitudes in the southern region of Saudi Arabia: Abha, 2,800 meters above sea level, the high altitude (HA) area and Jazan, 40 meters above sea level the low altitude (LA) area. Following exposure to high altitude, testes of rats revealed various types of atrophy and degeneration in the seminiferous tubules and in the interstitial tissue. There was detachment of the basal laminae of the tubules and a profound decrease in cellularity. When rats were brought back to their habitat (LA) and later examined, many tubules showed normal population of cells including spermatids and spermatozoa. Well-arranged epithelium was seen in most of the seminiferous tubules of these animals, normal interstitial space and no...
Tipo: Journal article Palavras-chave: High altitude; Low altitude; Hypoxia; Semen; Reproductive hormones.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100023
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Age Dependence of the Levels of Plasma Norepinephrine, Aldosterone, Renin Activity and Urinary Vanillylmandelic Acid in Normal and Essential Hypertensives Biol. Res.
ABD-ALLAH,NADIA M; HASSAN,FAYEZA H; ESMAT,AMR Y; HAMMAD,SOMAYA A.
In the present study the upper reference limits (URLs) for resting plasma norepinephrine, epinephrine, serum aldosterone, plasma renin activity, aldosterone/ renin activity ratio, as well as urinary vanillylmandelic acid in healthy Egyptian normotensive subjects over a range of ages (5-60 yr) were established. There was a significant age effect on plasma norepinephrine, UVMA, serum aldosterone and PRA, whereas a single URL for plasma epinephrine level is satisfactory. In uncomplicated untreated essential hypertensive subjects (5-60 yr), the average prevalence of elevation in the plasma norepinephrine, epinephrine and urinary vanillylmandelic acid above their corresponding URLs was 85.10,62.15 and 83.20 %, respectively. This suggests that elevation in...
Tipo: Journal article
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602004000100010
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The Impact of Proximol (Cymbopogon proximus) Intakeon Pregnant Albino Ratsand their Fetuses During Gestation Period International Journal of Morphology
Abdelrahman,Heba A; Omar,Amel R; Salah EL-Din,Eman Y.
Halphabarol, the active principle of Proximol, is the most potent of the four antispasmodics present in the national desert weed Cymbopogon proximus or ''Halfa Bar''. Halphabarol is of great value for the management of renal colic and in the expulsion of ureteric calculi as it causes dilation of the ureter below the site of calculus while active propulsion is maintained. Evaluation the congenital malformation of proximol in pregnant albino rats during gestation period. The virgin female rats were mated with male rats and the pregnant rats were orally administered a human equivalent dose (0.05 mg/kg) of Proximol from 5th-20th gestation day. At day 20 of pregnancy, all rats were anesthetized to obtained maternal and fetal data. The treatment group displayed...
Tipo: Journal article Palavras-chave: Cymbopogon proximus; Halfa Bar; Malformation.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200019
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Desarrollo Embrionario del Pargo Colorado Lutjanus colorado (Jordan & Gilbert, 1882) International Journal of Morphology
Abdo-de la Parra,María Isabel; García-Aguilar,Noemí; Rodríguez-Ibarra,L. Estela; Velasco-Blanco,Gabriela; Ibarra-Castro,Leonardo.
El pargo colorado (Lutjanus colorado) es una especie con un alto valor comercial en el mercado mexicano, con potencial para su cultivo. Hasta la fecha no existen estudios sobre su reproducción, cultivo larvario y engorda en cautiverio. El presente trabajo es el primer reporte sobre la descripción a detalle del desarrollo embrionario de la especie bajo condiciones de cultivo. Los huevos fertilizados viables del pargo colorado son pelágicos, esféricos, transparentes y con una sola gota de aceite. Midieron 0,77±0,09 mm de diámetro y la gota de aceite 0,14±0,01 mm. La primera división ocurrió a las 0,05 horas post fertilización (HPF). La eclosión se llevó a cabo a las 17,22 HPF bajo las condiciones del presente estudio. Las larvas recién eclosionadas midieron...
Tipo: Journal article Palavras-chave: Blástula; Gástrula; Organogénesis; Eclosión; Lutjanus colorado.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300025
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