87 research outputs found
Analysis of sex-ratio by length-class for bluefin tuna (Thunnus thynnus L.) caught from the Lybian trap fishery
This article analyzes patterns of bluefin tuna sex-ratio by length-class for the Libyan trap
fishery in the Mediterranean Sea.Le présent document analyse les schémas du sex-ratio du
thon rouge par classe de tailles pour la pêcherie libyenne de madrague dans la Méditerraneé.Este documento analiza patrones de ratio de sexos del atún rojo por
clases de talla para la pesquería libia de almadraba en el Mediterráneo
Length-weight relationships for bluefin tuna (Thunnus thynnus L.) caught from the Lybian trap fishery in 1999-2002
This paper reports length-weight relationships for the bluefin tuna (Thunnus thynnus L.) in the
Mediterranean. The estimated equations that are based on data from the Libyan trap fishery
during 1999 to 2002, allow conversions from fork length to round weight.Le présent document fournit una série de rapports
lonqueur-poids pour le thon rouge de la Mediterranée. Les équations estimées qui sont basées
sur les données des pêcherie libyenne de madrague au long de 1999 a 2002, permettent de
convertir la lonqueur à la fourche en poids totale.Este documento presenta una serie de relaciones talla-peso
para el atún rojo en el Mediterráneo. Las ecuaciones estimadas que se basan en datos de la
pesquería libia de almadraba de 1999 a 2002, permiten realizar conversiones de longitud a la
furca a peso vivo
Contribution of microscopy for understanding the mechanism of action against trypanosomatids
Transmission electron microscopy (TEM) has proved to be a useful tool to study the ultrastructural alterations and the target organelles of new antitrypanosomatid drugs. Thus, it has been observed that sesquiterpene lactones induce diverse ultrastructural alterations in both T. cruzi and Leishmania spp., such as cytoplasmic vacuolization, appearance of multilamellar structures, condensation of nuclear DNA, and, in some cases, an important accumulation of lipid vacuoles. This accumulation could be related to apoptotic events. Some of the sesquiterpene lactones (e.g., psilostachyin) have also been demonstrated to cause an intense mitochondrial swelling accompanied by a visible kinetoplast deformation as well as the appearance of multivesicular bodies. This mitochondrial swelling could be related to the generation of oxidative stress and associated to alterations in the ergosterol metabolism. The appearance of multilamellar structures and multiple kinetoplasts and flagella induced by the sesquiterpene lactone psilostachyin C indicates that this compound would act at the parasite cell cycle level, in an intermediate stage between kinetoplast segregation and nuclear division. In turn, the diterpene lactone icetexane has proved to induce the external membrane budding on T. cruzi together with an apparent disorganization of the pericellar cytoskeleton. Thus, ultrastructural TEM studies allow elucidating the possible mechanisms and the subsequent identification of molecular targets for the action of natural compounds on trypanosomatids.Fil: Lozano, Esteban Sebastián. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Medicina y Biología Experimental de Cuyo; ArgentinaFil: Spina Zapata, Renata María. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos; ArgentinaFil: Barrera, Patricia Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos; ArgentinaFil: Tonn, Carlos Eugenio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Investigaciones en Tecnología Química. Universidad Nacional de San Luis. Facultad de Química, Bioquímica y Farmacia. Instituto de Investigaciones en Tecnología Química; ArgentinaFil: Sosa Escudero, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos. Universidad Nacional de Cuyo. Facultad de Ciencias Médicas. Instituto de Histología y Embriología de Mendoza Dr. Mario H. Burgos; Argentin
Commercial and Therapeutic Potential of Plant-Based Fatty Acids
This chapter reviews plant-based fatty acids as well as their methods of production, applications in the industry, and benefits in treatments of cardiovascular and cerebral diseases, besides being a source of food. The fatty acids obtained from vegetable matrices have been acting as alternatives to the use of lipids of animal origin, due to their limitation in relation to the increase in demand. Thus, plants have been investigated in order to act as sources of fatty acids and assist in the supply of such demands. Vegetable oils represent not only an economical alternative but also a beneficial source of human health
Tracking bluefin tuna cohorts from east Atlantic Spanish fisheries since the 1980s
Relative abundance and mean size at age analyses were performed for the catches of three Atlantic
Spanish fisheries, in search of an exceptionally abundant cohort in the recent history of the eastern
Atlantic and Mediterranean bluefin tuna stock. Length distributions of baitboat fisheries, both in the Bay
of Biscay and areas close to the Strait of Gibraltar as well as trap catches from the Spanish Atlantic
coast were converted to age distributions using age length keys from calcified structures. Results do
validate indirectly the ageing method. The 1994 cohort was clearly tracked for juveniles and young
adults, 3 to 7 years old, in baitboat catches, and also for older specimens, 9 to 11 years old, in the trap
fisheries. Based on these results, it is suggested that the juvenile and young adults fisheries in the
western part of the Iberian Peninsula are interconnected between one another and with the Balearic
Islands area of the western Mediterranean, as it is the nearest spawning ground described and because
it is also supported by tagging and other studies.Afin de trouver une cohorte exceptionnellement abondante dans la récente histoire du stock de ton
rouge de l’Atlantique Est et de la Méditerranée, on a procédé à une analyse de l’abondance relative et
de la taille moyenne par âge des captures réalisées par trois pêcheries espagnoles de l’Atlantique. Les
distributions par tailles de deux pêcheries de canneurs dans le Golfe de Gascogne et dans les eaux
proches du Détroit de Gibraltar, ainsi que les prises des madragues de la côte atlantique espagnole, ont
été converties en âges à l’aide des clefs taille-âge obtenues à partir de la lecture de structures
calcifiées. Les résultats valident indirectement la méthode de détermination de l’âge. La cohorte de
1994 affiche une forte indication présente chez les juvéniles et les jeunes adultes, de 3 à 7 ans, capturés
dans les pêcheries de canneurs ainsi que chez les spécimens d’âge plus avancé, de 9 à 11 ans, pêchés à
la madrague. Ces résultats suggèrent que les pêcheries de juvéniles et de jeunes adultes de la partie
occidentale de la péninsule ibérique sont interconnectées entre elles ainsi qu’avec la zone des îles
Baléares, en Méditerranée occidentale, étant donné qu’il s’agit de la zone de frai la plus proche et qu’il
existe des indices de cette relation d’après les études de marquage et d’autres études.Para encontrar una cohorte excepcionalmente abundante en la historia reciente del stock de atún rojo
del Atlántico este y Mediterráneo, se realizó un análisis de la abundancia relativa y la talla media por
edad de las capturas de tres pesquerías atlánticas españolas. Las distribuciones de tallas de dos
pesquerías de cebo vivo, en el Golfo de Vizcaya y en aguas próximas al Estrecho de Gibraltar, así como
las capturas de las almadrabas de la costa atlántica española, fueron convertidas a edades mediante el
uso de claves talla edad, obtenidas a partir de la lectura de piezas esqueléticas. Los resultados validan
indirectamente el método de determinación de la edad. La cohorte de 1994 presenta una fuerte señal
que pudo ser encontrada en los juveniles y adultos jóvenes, 3 a 7 años, capturados en las pesquerías de
cebo vivo y también en especimenes mayores, 9 a 11 años, pescados con las almadrabas. Con esto
resultados se sugiere que las pesquerías de juveniles y adultos jóvenes de la parte occidental de la
península Ibérica están interconectadas entre ellas y con el área de las Islas Baleares, en el
Mediterráneo occidental, puesto que es la zona de puesta más próxima y porque también hay evidencias
de esta relación mediante el marcado y otros estudios
Resultados de la encomienda de la SGP al IEO para el estudio del atún rojo (Thunnus thynnus) del stock del Atlántico este (que incluye el Mediterráneo) considerando las almadrabas españolas como observatorios científicos
During the years of 2010-2012 was a research project bluefin tuna traps using Spanish as
scientific laboratories. The main objective was to keep the knowledge of the tendency of the
index of abundance of bluefin tuna caught with these nets, and it is the most significant index
used in the stock assessment process East Atlantic, including the Mediterranean.
Likewise studies were developed bluefin tuna biological parameters such as growth, feeding,
reproduction, stock structure and migration patterns, the results provide an important advance
in the understanding of the biology and behavior of this species.Versión del edito
Correction: Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and Condition
Correction: Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and ConditionPostprint4,411
Atlantic Bluefin Tuna (Thunnus thynnus) Biometrics and Condition
The compiled data for this study represents the first Atlantic and Mediterranean-wide effort
to pool all available biometric data for Atlantic bluefin tuna (Thunnus thynnus) with the collaboration
of many countries and scientific groups. Biometric relationships were based on
an extensive sampling (over 140,000 fish sampled), covering most of the fishing areas for
this species in the North Atlantic Ocean and Mediterranean Sea. Sensitivity analyses
were carried out to evaluate the representativeness of sampling and explore the most adequate
procedure to fit the weight-length relationship (WLR). The selected model for the
WLRs by stock included standardized data series (common measurement types)
weighted by the inverse variability. There was little difference between annual stock-specific
round weight-straight fork length relationships, with an overall difference of 6% in
weight. The predicted weight by month was estimated as an additional component in the
exponent of the weight-length function. The analyses of monthly variations of fish condition
by stock, maturity state and geographic area reflect annual cycles of spawning and
feeding behavior. We update and improve upon the biometric relationships for bluefin currently
used by the International Commission for the Conservation of Atlantic Tunas, by
incorporating substantially larger datasets than ever previously compiled, providing complete
documentation of sources and employing robust statistical fitting.WLRs and other conversion factors estimated in this study differ from the ones used in previous bluefin
stock assessments.Postprint4,411
Difficult tracheal intubation in neonates and infants. NEonate and Children audiT of Anaesthesia pRactice IN Europe (NECTARINE): a prospective European multicentre observational study
Background: Neonates and infants are susceptible to hypoxaemia in the perioperative period. The aim of this study was to analyse interventions related to anaesthesia tracheal intubations in this European cohort and identify their clinical consequences. Methods: We performed a secondary analysis of tracheal intubations of the European multicentre observational trial (NEonate and Children audiT of Anaesthesia pRactice IN Europe [NECTARINE]) in neonates and small infants with difficult tracheal intubation. The primary endpoint was the incidence of difficult intubation and the related complications. The secondary endpoints were the risk factors for severe hypoxaemia attributed to difficult airway management, and 30 and 90 day outcomes. Results: Tracheal intubation was planned in 4683 procedures. Difficult tracheal intubation, defined as two failed attempts of direct laryngoscopy, occurred in 266 children (271 procedures) with an incidence (95% confidence interval [CI]) of 5.8% (95% CI, 5.1e6.5). Bradycardia occurred in 8% of the cases with difficult intubation, whereas a significant decrease in oxygen saturation (SpO2<90% for 60 s) was reported in 40%. No associated risk factors could be identified among comorbidities, surgical, or anaesthesia management. Using propensity scoring to adjust for confounders, difficult anaesthesia tracheal intubation did not lead to an increase in 30 and 90 day morbidity or mortality. Conclusions: The results of the present study demonstrate a high incidence of difficult tracheal intubation in children less than 60 weeks post-conceptual age commonly resulting in severe hypoxaemia. Reassuringly, the morbidity and mortality at 30 and 90 days was not increased by the occurrence of a difficult intubation event. Clinical trial registration: NCT02350348
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