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Search Results: 1 - 10 of 466890 matches for " Christophe A. Serra "
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Fabrication of CeO2 by sol-gel process based on microfluidic technology as an analog preparation of ceramic nuclear fuel microspheres
Bin Ye,Jilang Miao,Jiaolong Li,Zichen Zhao,Zhenqi Chang,Christophe A. Serra
Physics , 2012,
Abstract: Microfluidics integrated with sol-gel processes is introduced in preparing monodispersed MOX nuclear fuel microspheres using nonactive cerium as a surrogate for uranium or plutonium. The detailed information about microfluidic devices and sol-gel processes are provided. The effects of viscosity and flow rate of continuous and dispersed phase on size and size distribution of CeO2 microspheres have been investigated. A comprehensive characterization of the CeO2 microspheres has been conducted, including XRD pattern, SEM, density, size and size distribution. The size of prepared monodisperse particles can be controlled precisely in range of 10{\mu}m to 1000{\mu}m and the particle CV is below 3%.
II problema della trasformazione artificiale delle condizioni meteorologiche
A. SERRA
Annals of Geophysics , 1963, DOI: 10.4401/ag-5252
Abstract: Sono esposti brevemente i principali piani ili esperienza di l a b o r a t o r i o e campali realizzati dal 1947 al 1960 r e l a t i v a m e n t e alla modificazione artificiale delle condizioni meteorologiche in generale e della induzione artificiale delle precipitazioni atmosferiche. Successivamente sono descritti i principi su cui sono f o n d a t e le tecniche più note sulle operazioni di induzione provocata delle precipitazioni atmosferiche. Infine sono t r a t t a t i brevemente gli a s p e t t i del s u d d e t t o problema ancora aperti alla ricerca e le varie possibilità pratiche di intervento dell'uomo sulla modificazione artificiale delle condizioni meteorologiche.
Instructor Fluency Correlates with Students’ Ratings of Their Learning and Their Instructor in an Actual Course  [PDF]
Michael J. Serra, Debbie A. Magreehan
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.78120
Abstract: The experience of ease or fluency that occurs when learners acquire information is often highly related to their metacognitive judgments of learning for that information. Laboratory-based research indicates that fluency can contribute to students’ overconfident judgments of learning and predictions of future test performance. Such research, however, typically involves artificial learning situations presented for brief periods of time and without a strong investment on the part of the learners. In actual courses, the most likely source of fluency may be instructor fluency: the experience of fluency that stems from content-independent attributes of the instructor and his or her presentation of the information. To examine whether this form of fluency relates to students’ judgments of learning in actual academic courses, we include a measure of instructor fluency in a survey completed by college students (n = 606) answering questions about their course instructors. Students’ content-independent perceptions of instructor fluency (e.g., volume; eye contact) are related to their judgments of learning for the course content, to their ratings of various qualities of the instructor and the course, and to their self-reported interest and motivation in the course. Importantly, these relationships maintain when we control for students’ final grades in the course and despite the fact that students make these ratings at a long temporal delay from the classroom experience. Therefore, much as occurs in the laboratory, students’ metacognitive judgments of their learning and ratings of instructor attributes are related to content independent qualities of their course instructors in actual semester-long courses.
De la sangre al cosmos: Reflexiones sobre "el sentido de pertenencia" a partir de Antígona, Romeo y Julieta y Las aves
Serra, María N.;
En-claves del pensamiento , 2011,
Abstract: why is relevant the belonging question? why is pertinent asking how individuals feel themselves as a part of space of relationships? the idea of membership should be thinking in new ways and not only as a political affiliation, if we consider that we are living in a period in which national sovereignty has been frayed and national citizenship has broken down and fragmented into new processes. the theoretical refection developed from antigone, romeo and juliet and the birds was set up as a retrieval of past stories that allows us to create new categories and point of view to understand the ways in which individuals create emotional ties to their spaces of relations. belongings related to new referents and types of contact, practices and categorizations that in our time must be linked both global interconnections and new boundaries created by technologies.
Consecuencias clínicas de la sarcopenia
Serra Rexah,J. A.;
Nutrición Hospitalaria , 2006,
Abstract: the concept of sarcopenia implies loss of muscle mass and function. it is a condition that accompanies aging, although it not always has clinical consequences. it is produced by many factors: nervous system (loss of alpha motor units in the spinal cord), muscular (loss of muscle quality and mass), humoral (decrease in anabolic hormones such as testosterone, estrogens, gh, and increase of several interleukines), and life style (physical activity). the main clinical consequences of sarcopenia relate with functional independence. thus, the sarcopenic elderly has greater difficulty walking, or do it more slowly, climbing up stairs, or doing basic daily living activities. these difficulties increase the risk for falls and, thus, fractures. they also affect bone formation, glucose tolerance, and body temperature regulation. besides, dependency is a mortality risk factor.
Grupo Catalana Occidente: Una empresa familiar entre los mayores grupos aseguradores espa oles
José María Serra
Universia Business Review , 2011,
Abstract:
El factor tiempo en el tratamiento de la hepatitis crónica por virus C The time factor in the management of chronic hepatitis C
M. A. Serra
Revista Espa?ola de Enfermedades Digestivas , 2008,
Abstract:
Consecuencias clínicas de la sarcopenia Clinical consequences of sarcopenia
J. A. Serra Rexah
Nutrición Hospitalaria , 2006,
Abstract: El concepto de sarcopenia implica pérdida de masa y potencia muscular. Es un hecho que acompa a al envejecimiento aunque no siempre tiene consecuencias clínicas.Se produce por multitud de factores: sistema nervioso (pérdida de unidades motoras alfa de la médula espinal), musculares (pérdida de la calidad y masa muscular), humorales (descenso de hormonas anabolizantes como testosterona, estrógenos y GH y aumento de distintas interleukinas) y de estilo de vida (actividad física).Las principales consecuencias clínicas de la sarcopenia tienen relación con la independencia funcional. Así los ancianos sarcopénicos tienen más dificultad para caminar o lo hacen más lentamente, para subir escaleras, para realizar las actividades básicas de la vida diaria. Estas dificultades aumentan el riesgo de caídas y por lo tanto de fracturas. También afecta a la formación de hueso, a la tolerancia a la glucosa y a la regulación de la temperatura corporal. Además la dependencia es un factor de riesgo de mortalidad. The concept of sarcopenia implies loss of muscle mass and function. It is a condition that accompanies aging, although it not always has clinical consequences. It is produced by many factors: nervous system (loss of alpha motor units in the spinal cord), muscular (loss of muscle quality and mass), humoral (decrease in anabolic hormones such as testosterone, estrogens, GH, and increase of several interleukines), and life style (physical activity). The main clinical consequences of sarcopenia relate with functional independence. Thus, the sarcopenic elderly has greater difficulty walking, or do it more slowly, climbing up stairs, or doing basic daily living activities. These difficulties increase the risk for falls and, thus, fractures. They also affect bone formation, glucose tolerance, and body temperature regulation. Besides, dependency is a mortality risk factor.
Substitution of Nitrite Reductase of Thermosynechococcus elongatus BP-1 by the Homologous Gene of Phormidium laminosum  [PDF]
Maite Buxens, Juan L. Serra, María J. Llama
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.36A009
Abstract: Even though the nitrate assimilation operon has been extensively studied in Phormidium laminosum, some aspects still remain unclear. The genetic manipulation of this cyanobacterium is problematic that hinders the elucidation of further aspects of nitrogen metabolism. To circumvent this, Thermosynechococcus elongatus BP-1 was selected as a surrogate host and its nirA gene was substituted by the homologous gene of P. laminosum. This process, based on Long Flanking Homology Polymerase Chain Reaction and the natural competence of T. elongatus BP-1, required an intermediate T. elongatus BP-1 ΔnirA::kat mutant, which carries a gene encoding a thermostable kanamycin nucleotidyl transferase in place of nirA_Te. In the presence of nirA_Pl, nirA defective mutants of T. elongatus BP-1 recovered the ability to grow with nitrate as the sole nitrogen source, and showed a phenotype similar to that observed in wild-type cells. The procedure could be useful to substitute other genes from T. elongatus BP-1 with the homologues from P. laminosum in order to study this particular operon. Furthermore, it may be used as a general tool to explore phenotypic changes due to the exchange of a single gene between cyanobacteria.

 

Effect of the Inorganic Nitrogen Source in the Expression of Nitrite Reductase (NirA) in Thermosynechococcus elongatus BP-1  [PDF]
Maite Buxens, María J. Llama, Juan L. Serra
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.415115
Abstract:

Nitrite reductase (NirA, EC 1.7.7.1) from the thermophilic, unicellular, non-N2-fixing cyanobacte-rium Thermosynechococcus elongatus BP-1 has been cloned and expressed in Escherichia coli. Analysis by SDS-PAGE of the pure recombinant protein (His6NirA) showed two protein bands, one of 58 kDa (corresponding to the theoretical His6NirA molecular mass) and another of 44 kDa. Western blotting and mass spectrometry analyses confirmed that the 44 kDa protein resulted from proteolysis of the intact His6NirA, and suggested the existence, at the C-terminal domain of the 58 kDa form, of a region particularly sensible to proteolysis or accessible to proteases. A sample of both forms of His6NirA was used to obtain anti-NirA polyclonal antibodies. These antibodies were used to assess, by SDS-PAGE followed by Western blotting, the in vivo expression of NirA in wild-type cells of T. elongatus BP-1 growing in cultures with nitrate, nitrite or ammonium which were inoculated with cells grown with different nitrogen sources. These analyses revealed that protein bands corresponding to the complete (58 kDa) and truncated (44 kDa) forms of NirA can also be detected in solubilized cells. Moreover, the presence of each of these forms depended on the nitrogen source used to grow cells. Thus, expression of the complete NirA generally predominates in cells growing in medium with nitrate or nitrite. However, the truncated form prevails in cells grown in nitrate or nitrite and then transferred to medium with ammonium. The fact that the patterns of in vivo expression of NirA are different depending on the nitrogen source used possibly relies on a post-translational regulatory mechanism by proteolysis.

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