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Search Results: 1 - 10 of 144454 matches for " Andrea V; Oka "
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Effect of the incubation temperature on the embryonic development and hatching time of eggs of the red porgy Pagrus pagrus (Linne, 1758) (Pisces: Sparidae)
Radonic,Mariela; López,Andrea V; Oka,Masakazu; Aristizábal,Eddie O;
Revista de biología marina y oceanografía , 2005, DOI: 10.4067/S0718-19572005000200001
Abstract: assessment of egg quality at early embryonic stages may be useful predictive criterion to evaluate the potential mass juvenile production in red porgy pagrus pagrus. the objective of the present study is to describe in detail the embryonic developmental stages in the red porgy and the time taken by larvae to hatch at three incubation temperatures. fertilized eggs obtained from natural spawnings were incubated at 15, 20 and 25oc. photomicrographs of all the embryonic stages were taken at the three temperatures. cell divisions after fertilization and organ appearance during the embryonic development were identified. the sequence in cellular divisions and appearance of sensory and motor organs were the same for the three temperatures, although the higher the temperature, the faster the stages of development. hatching time was also determined by the incubation temperature. at 25oc the completely-formed embryo hatched at approximately 25 h 26 min after fertilization whereas at 20oc and 15oc hatching occurred 37 and 60 h post fertilization. knowledge of the normal embryonic stages, the sequence of cleavages, the egg diameter, the number of oil drops, the timing of organ formation and the hatching rate is a basic requirement for assessing the eggs batches quality during seed mass production
Broodstock management and induced spawning of flounder Paralichthys orbignyanus (Valenciennes, 1839) under a closed recirculated system
Bambill,Gabriel A; Oka,Masakazu; Radonic,Mariela; López,Andrea V; Müller,Mónica I; Boccanfuso,Juan J; Bianca,Federico A;
Revista de biología marina y oceanografía , 2006, DOI: 10.4067/S0718-19572006000100007
Abstract: the present study was conducted to determine the parameters regulating spawning performance of p. orbignyanus wild broodstock. the adaptation to captivity was successfully achieved with minimal stress levels. in three consecutive spawning seasons, the annual photothermal manipulation was not effective for the maturation and natural spawning of females although males were running. females were hcg injected, releasing non fertilized eggs. artificial fertilization was carried out after stripping the fish with a total production of 18,000 fertilized eggs in 2001 (egg diameter= 800±10 μm), 55,300 in 2002 (egg diameter= 850±12 μm) and 1,635,000 fertilized eggs in 2003 (egg diameter 818.4 ±30.08 μm, oil drop 98.1 ±2.96 μm). for the study of the ovulation time, females were hand-stripped every 48 h (female 1), 96 h (female 2) and 144 h (female 3), after being induced by hormones. no statistical differences were found for fertilization and hatching rates and sai. this could be attributed to the small sample sizes, individual variation and/or stripping frequencies. nevertheless, qualitative differences were evident. although long-term studies are needed to confirm these observations, 96 h stripping frequency could be considered a good technique to obtain eggs and larvae experimentally. the estimated fecundity by this technique varied from 185,951 to 399,118 total eggs per kg of female
Age and gender differences of psychogenic fever: a review of the Japanese literature
Takakazu Oka, Kae Oka
BioPsychoSocial Medicine , 2007, DOI: 10.1186/1751-0759-1-11
Abstract: To achieve this goal, we searched Medline and Ichushi WEB, a Japanese medical database, and added other publications that were not included in these databases. Thus, we reviewed 195 Japanese cases of psychogenic fever published in 62 papers.Psychogenic fever patients ranged from 3 to 56 years old, with the highest number of cases occurring in 13 year-olds in both sexes. The male: female ratio of 1: 1.19 suggested a slight predominance of female cases. Psychogenic fever accounted for 18% of fever cases of unknown origin in children and 2–6% of the psychosomatic diseases of pediatric patients. Patients with psychogenic fever were not only found in pediatrics departments, but also in psychosomatic medicine, psychiatry, internal medicine, anesthesiology, dentistry, and obstetrics/gynecology departments.The age of psychogenic fever patients ranged from 3 to 56 years old and the male: female ratio was 1:1.19. Psychogenic fever is seen especially in adolescence in Japan.Psychogenic fever is one of the most common psychosomatic diseases; physical diseases affected by psychosocial factors. Psychogenic fever is diagnosed when (1) there is no organic disease that accounts for the fever and (2) the fever develops in a psychologically stressful situation or (3) emotionally stressful stimuli induce acute or persistent increases in core temperature (Tc) above the upper limit of normal body temperature (37°C). Although numerous case reports on psychogenic fever have been published, the mechanisms by which psychological stress increases core temperature are not fully understood, and epidemiological studies are limited. Therefore, our primary objective was to investigate the age distribution and gender differences of psychogenic fever in Japan by reviewing the published literature.To achieve this goal, on January 15th, 2007 using the key words "psychogenic fever" we performed electronic searches of Medline (1960–2006) and Ichushi WEB (1983 (the beginning of the service)-2006), a data
Modelación Fenomenológica de Cromatografía de Interacción Hidrofóbica
Mahn,Andrea V;
Información tecnológica , 2009, DOI: 10.4067/S0718-07642009000300015
Abstract: the aim of this work was to obtain a phenomenological model to describe the elution profile in hydrophobic interaction chromatography of a protein injected as a pulse. the plate model, which was solved numerically, was used, and good fit to experimental data was found. the plate model allowed simulating the chromatographic process under different operating conditions, such as flow rate, elution gradient and sample volume. in is concluded that it is possible to apply the plate theory to describe elution profiles of proteins in hydrophobic interaction chromatography. the proposed model could be used to optimize the separation of protein mixtures.
Rese a de "Ciudad, Poder, Gobernanza" de Gloria Yá ez Warner, Arturo Orellana, óscar Figueroa y Federico Arenas (Edits.)
Andrea Vásquez
Revista de Geografía, Norte Grande , 2008,
Abstract:
Modelación Fenomenológica de Cromatografía de Interacción Hidrofóbica Phenomenological Modelling of Hydrophobic Interaction Chromatography
Andrea V Mahn
Información Tecnológica , 2009,
Abstract: El objetivo de este trabajo fue obtener un modelo fenomenológico que describa el perfil de elusión, en cromatografía de interacción hidrofóbica de una proteína inyectada como pulso. Se adaptó el modelo de platos, el que fue resuelto numéricamente, obteniéndose un buen ajuste a los datos experimentales. El modelo de platos permitió realizar simulaciones del proceso bajo distintas condiciones de operación, como velocidad de flujo, gradiente de elución y volumen de muestra inyectada. Se concluye que es posible aplicar la teoría de platos para describir perfiles de elución de proteínas en cromatografía de interacción hidrofóbica. El modelo obtenido podría ser utilizado para optimizar la separación de una mezcla de proteínas. The aim of this work was to obtain a phenomenological model to describe the elution profile in hydrophobic interaction chromatography of a protein injected as a pulse. The plate model, which was solved numerically, was used, and good fit to experimental data was found. The plate model allowed simulating the chromatographic process under different operating conditions, such as flow rate, elution gradient and sample volume. In is concluded that it is possible to apply the plate theory to describe elution profiles of proteins in hydrophobic interaction chromatography. The proposed model could be used to optimize the separation of protein mixtures.
Marcelo Boeri, Apariencia y realidad en el pensamiento griego: Investigaciones sobre aspectos epistemológicos, éticos y de teoría de la acción en algunas teorías de la Antigüedad
Andrea Lozano Vásquez
Diánoia , 2009,
Abstract:
On the Weyl Transform with Symbol in the Gel'fand-Shilov Space and its Dual Space
OKA,YASUYUKI;
Cubo (Temuco) , 2010, DOI: 10.4067/S0719-06462010000300015
Abstract: in this paper, we claim two subjects. one is that the weyl transform with symbol in the gel'fand-shilov space l rr , r ≥ 1/2 , is a trace class operator. the other one is that the weyl transform with symbol in the generalized function (l rr )1, r ≥ 1/2 , is a continuous linear transformation from the gel'fand-shilov space l rr to (l rr )1. as r > 1, z. lozanov- crvenkovic and d. peri?ic have proved in [6] this result. our second claim includes their result.
From the Editor-in-Chief
Simeon Oka
Thermal Science , 2010,
Abstract: The Editorial Board of the journal Thermal Science is continuing to pay great attention to the processes in internal combustion engines, both due to their environmental impact and ability to use renewable energy sources i. e. different types of biofuels. Concerning that motor vehicles contribute about 14% of the global CO2 emission, it is understandable that many research efforts are devoted to processes in internal combustion engines and use of biofuels. The number of submitted papers dealing with processes in internal combustion engines is growing from months to months, so in the journal Thermal Science also will published in 2011 one issue devoted to the same topics. Papers submitted are already in the reviewing process. Professor Dragoslava Stojiljkovi} and Professor Stojan Petrovi} as Guest editors, had again a difficult task to make appropriate choice of the papers, covering wide range of topics. I am very grateful to Guest editors for their extremely competent choice of the topics and papers. Reviewers of the papers made, also, tremendous contributions to the quality of the papers published. This time, also, as in No. 3, 2009, we asked experts in traffic engineering to give their contribution. They pointed out importance of the internal combustion engine energy efficiency, vehicle fleet operation management and logistic efficiency, and painted large scale picture of the environmental problems caused by large density traffic. We hope that this point of view will make new impulse for many new joint projects with the aim to investigate impact of the processes in internal combustion engines and logistic of motor fleet management, and organization of traffic flows, especially in large towns, on environment. Papers devoted to the thermal processes in internal combustion engines are grouped in Part one of this issue. Due to large number of papers accepted for publication, we have been forced to introduce Part two, in which are grouped selected papers dealing with problems in fluid dynamic and heat transfer of possible interest in design of the internal combustion engines.
From the Editor-in-Chief
Simeon Oka
Thermal Science , 2011,
Abstract: In the year 2011 Editorial Board of the journal Thermal Science continues with the policy to prepare special issues, Supplements, devoted to the specific, actual scientific topics. Supple ments, issued besides four regular issues per year, have double role in publishing the journal Thermal Science: from one side Supplemental issues gives possibility to present to readers most interesting topics, and from the other side it is possible to publish greater number of papers, following permanent growing interest of the researchers to publish results of their investigations in our journal. Following those ideas, Editorial Board with greatest interest accepted proposal of the organizer of the Mini-symposium on Analytical Methods for Thermal Science, Professor Ji-Huan He and Shanghai Modern Textile Institute, to pre pare special issue with selected papers presented this Symposium. More over, to devote special issue of the journal Thermal Science, to analytical methods, seems to be very challenging, in this era of numerical models and commercial CFD software, used by every researcher, even at the beginning of the professional career. The beginners in investigations think that by numerical modelling it is possible to solve every physical problem, in thermal sciences, too. After wards, they realize that it is not the case, and that other scientific tools, experiments, and analytical methods can not be avoided, and even give better and more correct physical explanation of the processes. For those reasons, my personal opinion is that this issue of the journal Thermal Science is especially important, and will present new impulse for increasing quality of the journal. Papers presented at Symposium "Analytical Methods for Thermal Science", in the frame of the 3rd International Symposium on Nonlinear Dynamics, September 25-28, 2010, Shanghai, China, and selected for this special issue, convey a strong, reliable, efficient, and promising development of thermal science. Included herein is a collection of original refereed research papers by well-established researchers in the field of nonlinear science. We hope that these papers will prove to be a timely and valuable reference for researchers in this area. Analytical approach to thermal science is challenging and promising, and is playing an even more important role in optimal design of various thermal problems. Considering this fact, selection of the papers for this special issue has the aim to show illustrating approaches to various thermal problems by various methods including fractal geometry and fractional calculus, a
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