Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
1
artículo
Publicado 2017
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The aim of this study was to evaluate the cryopreservation of Brycon henni semen using three programmable freezing curves and two permeable cryoprotectants. Semen of 80 males were diluted in medium supplemented with ethylene glycol (EG) or dimethylsulfoxide (DMSO), and cryopreserved in semen straws using three programmable freezing curves: slow (66 min, -0.42 °C/min), medium (43.3 min, -0.6 °C/min) and ultra-rapid (7.7 min, -5.19 °C/min). After one month of storage, semen was thawed and motility was evaluated through a class analysis system (SCA®) and sperm vitality (EV) by fluorescence microscopy with SYBR14/IP probes. For statistical analysis, generalized linear models (GLM) were adjusted and means compared by the Tukey test. The medium and ultrarapid velocity curves showed higher and equivalent values for total motility, progressive motility, and linear velocity of sperm (p<0.0...
2
artículo
Publicado 2017
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The aim of this study was to evaluate the cryopreservation of Brycon henni semen using three programmable freezing curves and two permeable cryoprotectants. Semen of 80 males were diluted in medium supplemented with ethylene glycol (EG) or dimethylsulfoxide (DMSO), and cryopreserved in semen straws using three programmable freezing curves: slow (66 min, -0.42 °C/min), medium (43.3 min, -0.6 °C/min) and ultra-rapid (7.7 min, -5.19 °C/min). After one month of storage, semen was thawed and motility was evaluated through a class analysis system (SCA®) and sperm vitality (EV) by fluorescence microscopy with SYBR14/IP probes. For statistical analysis, generalized linear models (GLM) were adjusted and means compared by the Tukey test. The medium and ultrarapid velocity curves showed higher and equivalent values for total motility, progressive motility, and linear velocity of sperm (p<0.0...
3
tesis de grado
Publicado 2023
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La presente investigación se desarrolló en el distrito de Sarín y parte del centro poblado de Shiracorral puesto que la carretera LI-916 conecta esas zonas, donde sus pobladores tienen por principales actividades económicas la venta de madera, la agricultura correspondiente a la siembra de maíz, trigo, cebada y la piscicultura correspondiente a la crianza de truchas. El enfoque del estudio se basa en una trocha carrozable con un ancho de calzada considerada de 6.60 m que actualmente la transitabilidad se ve altamente afectada sobre todo en épocas de lluvia las cuales se dan entre los meses de noviembre a marzo. Así pues, para dar inicio la presente investigación se empezó por el levantamiento topográfico clasificado el tipo de orografía con pendientes transversales accidentadas y que se encuentran en el rango de entre 51-100% Estudios previos como la mecánica de suelos se det...
4
tesis de grado
Publicado 2021
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La pesca es una de las actividades más importantes a nivel internacional por los beneficios económicos y nutricionales que brinda a la población mundial. El Perú se encuentra entre las principales potencias pesqueras con el 8% de producción anual. A pesar de ello, no existe un correcto control de las extracciones pesqueras, ni consciencia de conservación entre los pescadores, produciendo depredación de la fauna marina. Esto se evidencia en Pucusana, la sobrepoblación de pescadores que buscan medios para subsistir lleva a la sobreexplotación de la zona, teniendo como consecuencia una menor producción anual. El Proyecto tiene como finalidad intervenir el terminal pesquero de Pucusana, implementando áreas funcionales para el adecuado procesamiento pesquero. Para esto, se realizó el levantamiento del inmueble, con un respectivo análisis de la edificación y de su entorno, ademá...
5
artículo
Publicado 2016
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The objective of the investigation was to analyze of benthic macroinvertebrates biodiversity of Cunas river by means of environmental indicators. Three sampling sectors were defined two contrasting periods. The anthropic pressures evaluation was carried out by means of DBO5 determination contributed by waste water. Water samples were collected for nitrate, phosphate and fecal coliform determination. The measured indicators in situ were: dissolved oxygen, dissolved total solids, conductivity, temperature, pH and turbidity. The benthic macroinvertebrate samples were collected using a Surber net with 250 µm wire netting opening. The anthropic pressure results on the benthic macroinvertebrates were: fish farming waste water DBO5 mean 7.70 mg/L, from livestock activity 869 mg/L and from urban activity 428.3 mg/L. The physicochemical and bacteriological indicator results showed significant di...
6
artículo
Publicado 2016
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The objective of the investigation was to analyze of benthic macroinvertebrates biodiversity of Cunas river by means of environmental indicators. Three sampling sectors were defined two contrasting periods. The anthropic pressures evaluation was carried out by means of DBO5 determination contributed by waste water. Water samples were collected for nitrate, phosphate and fecal coliform determination. The measured indicators in situ were: dissolved oxygen, dissolved total solids, conductivity, temperature, pH and turbidity. The benthic macroinvertebrate samples were collected using a Surber net with 250 µm wire netting opening. The anthropic pressure results on the benthic macroinvertebrates were: fish farming waste water DBO5 mean 7.70 mg/L, from livestock activity 869 mg/L and from urban activity 428.3 mg/L. The physicochemical and bacteriological indicator results showed significant di...
7
artículo
Publicado 1956
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In this paper a summary of research conducted by the Institute of Biochemistry and Nutrition, Faculty of Medicine of Lima regarding nutritional problems Peru is made. To this end there have been clinical, haematological and biochemical studies to identify deficiency states in groups of individuals from different economic classes, soldiers, adults, children and seniors. Regarding calorie needs an applicable table shows the average weight in relation to age, obtained from national surveys. Protein deficiencies, the solution would be in the highest consumption of fish are detected. Referring to the lack of calcium in the diets is shown that by the constant action of the solar rays properly manage groups examined using the poor contribution. Alkaline phosphatase determinations reveal absence of rickets. A high percentage of anemia in the jungle due to high intestinal parasitism and overall d...
8
9
tesis de grado
Publicado 2021
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El objetivo del presente estudio fue identificar los ectoparásitos de juveniles de Colossoma macropomum, que se cultivan en cuatro centros piscícolas (CP1, CP2, CP3 y CP4), del eje de la carretera Iquitos-Nauta. Para ello durante los meses marzo a mayo del 2019 se colectaron un total de 84 juveniles de Colossoma macropomum, siendo trasladados a las instalaciones de la ONG´s Amazon Research Center for Ornamental Fishes. Los peces fueron sacrificados y se analizaron muestras de piel, ojos, aletas, narinas, cavidad bucal y branquias. Así mismo, se registraron la calidad del agua de los estanques de cultivo al momento de la colecta de los peces. Los parásitos fueron identificados mediante claves taxonómicas específicas para cada clase de parásito y se determinaron los índices parasitarios, prevalencia, abundancia, intensidad media y abundancia media. Para la relación entre el peso ...
10
artículo
Publicado 2013
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Paranthias colonus(Valenciennes, 1846) is used as fish bait replacing first class fish that have been overfished in the Gulf of California. Due to its recent commercial importance, the parasite fauna of P. colonusfrom of El Sargento, Baja California Sur, Mexico is characterized to define its role in the life cycle of its parasites. 30 fishes were fixed in 4% formaldehyde for later examination. Helminths and copepods were treated with conventional techniques specific to each kind of parasite. P. colonushad 100% prevalence and 46.5 mean intensity of parasites. Adults of Pseudorhabdosynochus sp., Prodistomum orientalis, Brachyphallus sp., Lecithochirium sp., Spinitectus sp., Caligus sp., Pandaridae, and Hatschekia sp. and larevae of Tetragonocephalidae, Scolex pleuronectis and Anisakis sp. were found. There was evidence of host specificity of Pseudorhabdosynochussp. and Hatschekiasp. by ser...
11
tesis de grado
Modalidad de obtención de grado y/o título sin designación de asesor
12
artículo
Publicado 2018
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La región Loreto presenta la mayor extensión geográfica del Perú y posee una megadiversidad de especies de flora y fauna que da soporte al desarrollo de actividades socioeconómicas y culturales. En este estudio actualizamos el conocimiento de la base de datos genéticos de vertebrados existentes en Loreto. Utilizamos el buscador de secuencias genéticas implementado en el paquete rentrez del programa R, organizamos y comparamos la cantidad de secuencias en diferentes niveles taxonómicos de cada orden de vertebrados, genes más empleados y verificamos la existencia de secuencias genéticas para especies de interés comercial. Los resultados indican la existencia de 1 960 secuencias genéticas depositadas en GenBank, de los cuales 38,52% pertenecen a la Clase Peces; 29,33% son anfibios; 21,98% aves; 8,92% mamíferos y 1,22% reptiles. Estimamos que solo el 19,44% de especies de verteb...
13
artículo
The Loreto region has the greatest geographical extension of Peru and has a mega diversity of flora and fauna that supports the development of socio-economic and cultural activities. In this study we evaluate the knowledge of the genetic database of vertebrates in Loreto. We use the gene sequence search implemented in the R rentrez package, we organize and compare the quantity of sequences in different taxonomic levels of each order of vertebrates, most used genes and existence of genetic sequences for species of commercial interest and for conservation. Our results indicate the existence of 1 960 genetic sequences deposited in the GenBank, of which 38,52% belong to the Fish; 29,33% are amphibians; 21,98% birds; 8,92% mammals and 1,22% reptiles. Our results estimates that only 19,44% of vertebrate species in Loreto have genetic data. The genes most used for these analyzes varied in abund...
14
artículo
Publicado 2015
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The aim of this study was to determine the type and frequency of parasites in gamitana gills (Colossoma macropomum) and to describe the associated histopathological lesions. Thirty specimens were taken from a fish farm in Iquitos, Peru. The left branchial arches were placed in Petri dishes with distilled water to observe the presence of parasites and the right arches were fixed with formalin 5% for histopathological studies. Besides, water quality of the pond was analyzed. Three types of ectoparasites were identified: monogeneans, members of the Family Dactylogyridae, Subfamilies Anacanthorinae and Ancyrocephalinae (100%, 30/30), ones protozoan, member of the Family Oodinidae, genus Piscinoodinium (36.7%, 11/30), and one arthropod, member of the Class Maxillopoda, Sub-class Copepoda (20%, 6/30). Among the histopathological lesions, the most common were inflammatory disorders: presence of...
15
artículo
Publicado 2015
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The aim of this study was to determine the type and frequency of parasites in gamitana gills (Colossoma macropomum) and to describe the associated histopathological lesions. Thirty specimens were taken from a fish farm in Iquitos, Peru. The left branchial arches were placed in Petri dishes with distilled water to observe the presence of parasites and the right arches were fixed with formalin 5% for histopathological studies. Besides, water quality of the pond was analyzed. Three types of ectoparasites were identified: monogeneans, members of the Family Dactylogyridae, Subfamilies Anacanthorinae and Ancyrocephalinae (100%, 30/30), ones protozoan, member of the Family Oodinidae, genus Piscinoodinium (36.7%, 11/30), and one arthropod, member of the Class Maxillopoda, Sub-class Copepoda (20%, 6/30). Among the histopathological lesions, the most common were inflammatory disorders: presence of...
16
artículo
Mr. Editor We have read with special attention and interest the article by Condemayta et al (2018), where they present the results of an epidemiological study on the prevalence of infection by the intestinal parasite "Balantidium coli" and the risk factors associated with its transmission. in humans and pigs in two populations of the Acora District, province and Department of Puno, Peru. In general, we agree with the content of the article. However, we wish to comment on the taxonomic and systematic status of "Balantidium coli", and the corresponding nomenclature of the enteroparasitic disease it causes, which we consider require updating in light of the new evidence and findings presented in the scientific literature of the area, especially those of the molecular type. In this sense, it should first be indicated that the genus Balantidium belongs to the Phylum Ciliophora (Class Litostom...
17
artículo
Mr. Editor We have read with special attention and interest the article by Condemayta et al (2018), where they present the results of an epidemiological study on the prevalence of infection by the intestinal parasite "Balantidium coli" and the risk factors associated with its transmission. in humans and pigs in two populations of the Acora District, province and Department of Puno, Peru. In general, we agree with the content of the article. However, we wish to comment on the taxonomic and systematic status of "Balantidium coli", and the corresponding nomenclature of the enteroparasitic disease it causes, which we consider require updating in light of the new evidence and findings presented in the scientific literature of the area, especially those of the molecular type. In this sense, it should first be indicated that the genus Balantidium belongs to the Phylum Ciliophora (Class Litostom...
18
artículo
Mr. Editor We have read with special attention and interest the article by Condemayta et al (2018), where they present the results of an epidemiological study on the prevalence of infection by the intestinal parasite "Balantidium coli" and the risk factors associated with its transmission. in humans and pigs in two populations of the Acora District, province and Department of Puno, Peru. In general, we agree with the content of the article. However, we wish to comment on the taxonomic and systematic status of "Balantidium coli", and the corresponding nomenclature of the enteroparasitic disease it causes, which we consider require updating in light of the new evidence and findings presented in the scientific literature of the area, especially those of the molecular type. In this sense, it should first be indicated that the genus Balantidium belongs to the Phylum Ciliophora (Class Litostom...
19
artículo
Mr. Editor We have read with special attention and interest the article by Condemayta et al (2018), where they present the results of an epidemiological study on the prevalence of infection by the intestinal parasite "Balantidium coli" and the risk factors associated with its transmission. in humans and pigs in two populations of the Acora District, province and Department of Puno, Peru. In general, we agree with the content of the article. However, we wish to comment on the taxonomic and systematic status of "Balantidium coli", and the corresponding nomenclature of the enteroparasitic disease it causes, which we consider require updating in light of the new evidence and findings presented in the scientific literature of the area, especially those of the molecular type. In this sense, it should first be indicated that the genus Balantidium belongs to the Phylum Ciliophora (Class Litostom...
20
artículo
Publicado 2024
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En noviembre 2019 y 2020 se desarrollaron monitoreos para determinar el estado del ecosistema marino en las zonas submareales, intermareales de Pacasmayo, Malabrigo, Huanchaco y Salaverry, así como de los ríos Jequetepeque y Moche. Se midieron parámetros físicos, químicos y biológicos en agua y sedimento. Se detectó condición oceanográfica cálida debido al arribo de una onda Kelvin en la costa centro-norte de Perú. El contenido de oxígeno y potencial de Hidrógeno cumplió con los estándares de calidad ambiental (ECA, Decreto Supremo Nº 004-2017-Minam, 2017). En Huanchaco y Salaverry se evidenció contaminación por materia orgánica, el sedimento presentó olor a sulfuros, predominando fango y arena muy fina, al igual que en el fondo del desembarcadero de Malabrigo. Se registró contaminación fecal en Pacasmayo, las playas La Bocana del río Jequetepeque, El Muelle, La La...
