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1
artículo
Publicado 2025
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The chame Dormitator latifrons is a symbolic species associated with rural aquaculture in coastal regions of the South American Pacific. Its adaptation to stay alive out of water (anhydrobiosis) for days is beneficial for its storage and transport at room temperature. The aim of the study was to determine the tolerance of chame to anhydrous conditions. Sixty chames were distributed in containers and kept in two climate-controlled environments at 16 and 24 °C for 96 h. Survival, malondialdehyde levels, total proteins and pH in the muscles and lactate dehydrogenase (LDH) activity in the gills were monitored. Additionally, the behaviour of the fish was monitored, as well as the total number of microorganisms with a sensory evaluation. The critical period of survival occurred after 48 h, where the pH decreased, and the MDA levels increased. The number of microorganisms increased in both en...
2
artículo
Publicado 2019
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Se analizaron las características de una cepa de Bacillus amyloliquefaciens aislada del intestino de Arapaima gigas, seleccionada por su capacidad para generar inhibición de múltiples bacterias patógenas de peces, mediante el uso de herramientas moleculares como PCR y espectrometría de masas - MALDI TOF/TOF. Los resultados mostraron a través de PCR que esta cepa cuenta con genes claves para la generación de péptidos antimicrobianos como bmyB (bacillomycin L synthetase B), fenD (fengycin sintetasa), srfAA (subunidad 1 surfactin sintetasa), bacA (proteína de biosíntesis de bacilysin) e iturin (iturin A). Además, mediante el análisis por espectrometría de masas se detectaron bacteriocinas (plipastatin, gramicidin, fengycin, surfactin), proteínas de fijación al intestino (like-enolase), proteinas transportadoras de péptidos antimicrobianos (ABC-transporters) y proteínas de e...
3
artículo
Publicado 2019
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The characteristics of a strain of Bacillus amyloliquefaciens isolated from the intestine of Arapaima gigas, selected for its ability to generate inhibition of multiple pathogenic bacteria of fishes were analyzed by using molecular tools such as PCR and mass spectrometry - MALDI TOF / TOFM. The results showed through PCR that this strain has key genes for the generation of antimicrobial peptides such as bmyB (bacillomycin L synthetase B), fenD (fengycin synthetase), srfAA (subunit 1 surfactin synthetase), bacA (bacilysin biosynthesis protein) and iturin (iturin A). In addition, by mass spectrometry analysis were detected bacteriocins (plipastatin, gramicidin, fengycin, surfactin), intestine binding proteins (like-enolase), antimicrobial peptide transport proteins (ABC-transporters) and immune system stimulation proteins like flagelin. Collagenase, chitinases and xylose-isomerases protein...
4
artículo
Publicado 2022
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The aim of this study was to evaluate the sedative effect of three products: valerian extract (Valeriana officinalis), benzocaine and tricaine methanesulfonate (MS-222) on stress levels produced by a simulated transport model in tilapia fingerlings. In a first part, the sedative dose of the products was determined based on the clinical characteristics that indicate depression of the central nervous system. In the second part, sedation and subsequent simulated transport for 3 hours were performed. The fish were euthanized, and blood samples were taken from the tail vein to determine cortisol (ELISA) and glucose (portable glucometer) levels, haematological parameters and mortality. The optimal doses of sedation were 200, 35 and 75 mg/l, respectively, for valerian extract, benzocaine and MS-222. After 3 h of simulated transport, cortisol and glucose values were similar or higher compared to...
5
tesis de grado
Publicado 2006
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Los cambios post mortem que ocurren en el músculo del pescado son complejos y en corto tiempo. Durante el almacenamiento, las proteínas musculares pierden sus propiedades funcionales de acuerdo a su naturaleza y características bioquímicas intrínsecas, razón por la cual el presente estudio tiene como objetivos determinar el porcentaje de proteína de las fracciones: miofibrilar, sarcoplasmática, álcali-soluble y estroma, del músculo de “gamitana” Colossoma macropomun durante el almacenamiento en frío. Para ello, fueron utilizados peces de cultivo, de la especie “gamitana” Colossoma macropomun, del IVITA (Instituto de Investigaciones Tropicales y de Altura) del departamento de Ucayali, los cuales fueron colocados en un ¨cooler¨ con hielo y transportados a Lima. Se procedió a separar a los especímenes de acuerdo al tipo de almacenamiento (ambiente, hielo y congelació...
