Papers by oscar rodriguez
Journal of Food Science, 2003
ABSTRACT Sensory and quantitative microbiological analyses were performed in farmed turbot (Psett... more ABSTRACT Sensory and quantitative microbiological analyses were performed in farmed turbot (Psetta maxima) during iced storage. Sensory analyses revealed a shelf life of 19 d for farmed turbot. The production of total volatile base nitrogen (TVB-N) and trimethylamine-nitrogen (TMA-N) was low and reached levels close to 40 mg TVB-N/ 100 g muscle and 3.5 mg /TMA-N/100 g muscle, even after 40 d of refrigerated storage. The pH value of turbot muscle increased from an initial value of 6.3 to close to 7.0 after 29 d of iced storage. Microbial growth was slow in iced turbot: total aerobic counts reached levels below 7 log colony forming units/g units even after 40 d of storage. Lactic acid bacteria—mainly Lactobacillus delbrueckii subsp. delbrueckii and Lactococcus lactis subsp. lactis strains—were predominant among the proteolytic strains isolated from iced turbot. Proteolytic strains of L. lactis subsp. lactis, Brochothrix thermosphacta, Plesiomonas shigelloides, Proteus vulgaris, and Pantoea species were also isolated from temperature-abused turbot, such proteolytic strains being predominant with respect to nonpro-teolytic microorganisms, suggesting a preferential role of such proteolytic bacteria in the spoilage of turbot. The slow bacterial growth, together with the relative predominance of lactic acid bacteria over Gram-negative microorganisms, may be related to the extraordinary maintenance of the quality and extended shelf life of farmed turbot.
Ultrasound in Medicine and Biology, 1990
The effect of low-intensity ultrasound on the healing strength of tendons was studied in experime... more The effect of low-intensity ultrasound on the healing strength of tendons was studied in experimentally tenotomized, repaired and immobilized right tendo calcaneus (Achilles tendon) of 24 rabbits. Ten tendons were sonicated in continuous waves at a space-averaged intensity of 0.5 W cm-2 for 5 min every day. The remaining 14 tendons were mock-sonicated as controls. After nine consecutive treatments, the tendons were excised under anesthesia and compared for differences in tensile strength, tensile stress and energy absorption capacity. Sonication at 0.5 W cm-2 induced a significant increase in the tensile strength (p less than .02), tensile stress (p less than .005) and energy absorption capacity (p less than .001) of the tendons. These findings suggest that high-intensity sonication may not be necessary to augment the healing strength of tendons and that sonication at similarly low intensities may enhance the healing process of surgically repaired human tendo calcaneus.
Microbiology-sgm, 1997
The replicator region of the symbiotic plasmid of Rhizobium etli CFN42 was cloned and sequenced. ... more The replicator region of the symbiotic plasmid of Rhizobium etli CFN42 was cloned and sequenced. A plasmid derivative (pH3) harbouring a 5.6 kb Hindlll fragment from the symbiotic plasmid was found to be capable of independent replication and eliminated the symbiotic plasmid when introduced into a R. efli CFNXlOl strain (a r e d derivative). The stability and the copy number of pH3 were the same as that of the symbiotic plasmid, indicating that the information required for stable replication and incompatibility resides in the 5.6 kb Hindlll fragment. The sequence analysis of this fragment showed the presence of three ORFs similar in sequence and organization to repA, repB and repC described for the replicator regions of the Agrobacferium plasmids pTiBGS3 and pRiA4b and for the R. leguminosarum cryptic plasmid pRL8JI. Hybridization studies showed that p42d-like replicator sequences are found in the symbiotic plasmids of other R. etli strains and in a 'cryptic' plasmid of R. fropici.
Por: Uch Portal de estudiantes de recursos humanos 1) Relaciona la propuesta efectuada por Edward... more Por: Uch Portal de estudiantes de recursos humanos 1) Relaciona la propuesta efectuada por Edward Deming con las escuelas que trabajan con la motivación como determinante de conducta en el sujeto. Indica cual de las escuelas vistas se acerca mas al caso Pontiac. Justifica tu elección.
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Papers by oscar rodriguez