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| Registros recuperados: 11 | |
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| Rajoka,Muhammad Ibrahim; Khan,Sana. |
| Production of β-xylosidaseby a cycloheximide and 2-deoxy-D-glucose-resistant mutant of Kluyveromyces marxianus PPY125 was studied when cultured on growth media containing galactose, glucose, xylose, cellobiose, sucrose and lactose as carbon sources. Xylose, cellobiose, lactose and sucrose were the key substrates. Both K. marxianus PPY125 and its mutant (M 125) supported maximum β-xylosidase specific product yield (Y P/X) following growth on xylose. Basal level of activity was observed in non-induced cultures grown on glucose. The mutant produced 1.5 to 2-fold more β-xylosidase than that produced by the wild cells. Synthesis of β-xylosidase was regulated by an induction mechanism in both wild and mutant cells. Addition of... |
| Tipo: Journal article |
Palavras-chave: Enthalpy; Entropy; Enzyme kinetics; Fermentation; Induction; Thermodynamics. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582005000200007 |
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| Qaiser,Suleman; Saleemi,Anwar R; Umar,Muhammad. |
| The biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g-1, respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 - 45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich... |
| Tipo: Journal article |
Palavras-chave: Biosorption; Equilibrium; Groundnut hull; Kinetics; Thermodynamics. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400003 |
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| Duplisea, Daniel; Blanchard, Fabian. |
| We examined the dynamics of fish species and how they relate to species assemblage coherence in the heavily exploited Georges Bank fish community. Coherence is defined as reduced temporal variability of total assemblage biomass. We assumed that a higher degree of compensation hence coherence occurs within competitively coupled species assemblages; therefore, fisheries may directly alter the dynamics of certain targeted species sizes but assemblage structure will be relatively more stable owing to compensatory interactions. Species-sizes were grouped, based on negative covariance coupling in biomass time series from survey data. Assemblages representing benthic feeders were clearly identified by this method; furthermore, the most heavily exploited... |
| Tipo: Text |
Palavras-chave: Diversity stability; Species replacement; Energy flow; Emergent property; Thermodynamics; Goal function. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/publication-806.pdf |
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| Perugachi Salamea, C.. |
| The ocean reanalysis Simple Ocean Data Assimilation (SODA) 2.2.4 is used to explore the changes in upwelling from normal conditions to either El Niño or La Niña conditions. Physical and thermodynamic variables from the reanalysis are used to explore the structure and behaviour of El Niño Southern Oscillation (ENSO) events. The results of this analysis show that sea surface temperature (SST), entrainment velocity, wind stress, mixed layer depth, wind stress curl, and heat content anomalies are in general agreement with ENSO theory. Interestingly, the distribution of upwelling based on the entrainment velocity is very patchy, which led us to explore zonal and meridional sections of vertical velocity. We used three methods to compute changes in upwelling... |
| Tipo: Journal Contribution |
Palavras-chave: Upwelling; El Nino phenomena; Surface temperature; Thermodynamics. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5754 |
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| Alverson, Keith. |
| The 41st Executive Council of the IOC instructed the Executive Secretary to present to the Assembly, at its 25th session, the new equation of state of seawater that has been developmed by SCOR-IAPSO working group 127 and to invite the Assembly to consider adopting a resolution formally adopting this new standard. One of the implications of the new formulation is adoption of a new variable ‘Absolute Salinity’. There are substantial potential implications associated with adopting the new standard for long term continuity of records and national data centers. WG127 has recommended the adoption of Absolute Salinity to be used in journals to describe the salinity of seawater and to be used as the salinity argument to algorithms that give the various... |
| Tipo: Conference Material |
Palavras-chave: Thermodynamics; Equations of state. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/2986 |
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| Perugachi Salamea, C.. |
| The ocean reanalysis Simple Ocean Data Assimilation (SODA) 2.2.4 is used to explore the changes in upwelling from normal conditions to either El Niño or La Niña conditions. Physical and termodynamics variables from the reanalysis are used to explore the structure and behaviour of El Niño Southern Oscillaion (ENSO) events. The results of this analysis show that sea surface temperature (SST), entrainment velocity, wind stress, mixed layer depth, wind stress curl, and heat content anomalies are in general agreement with ENSO theory. Interestingly, the distribution of upwelling based on the entrainment velocity is very patchy, which led us to explore zonal and meridional sections of vertical velocity. We used three methods to compute changes in upwelling... |
| Tipo: Journal Contribution |
Palavras-chave: Upwelling; El Nino phenomena; Surface temperature; Thermodynamics. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5761 |
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| Monnin, C.; Jeandel, C.; Cattaldo, T.; Dehairs, F.A.. |
| This paper addresses the question of the eventual control of barium concentration in seawater by an equilibrium with barite. For this, we have used a new thermodynamic model to compute the barite saturation index of ocean waters, mainly from GEOSECS data. Our results show that equilibrium between barite and seawater is reached in a number of places: cold surface waters of the Southern Ocean, waters at intermediate depths (2000-3500 m) in the Pacific, deep waters (2000-3500 m) of the Gulf of Bengal. The only samples for which a slight barite supersaturation is found are the surface waters at GEOSECS station G89 in the Weddell Gyre. Besides these locations, the rest of the world's oceans is undersaturated, as was established by Church and Wolgemuth [Church,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aqueous solutions; Oceanography; Oceans; Saturation; Thermodynamics. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10260 |
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| Registros recuperados: 11 | |
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