Screening for extracellular enzyme activities by bacteria isolated from samples collected in the Tyrrhenian Sea

2007 ◽  
Vol 57 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Massimiliano Fenice ◽  
Anna Maria Gallo ◽  
Belen Juarez-Jimenez ◽  
Jesus Gonzalez-Lopez
Keyword(s):  
Enzyme Activities ◽  
Extracellular Enzyme ◽  
Tyrrhenian Sea ◽  
Extracellular Enzyme Activities

scholarly journals Extracellular enzyme activities potentially involved in the pathogenicity of Mycobacterium tuberculosis

Microbiology ◽  
1998 ◽  
Vol 144 (2) ◽  
pp. 577-587 ◽  
Author(s):  
C. Raynaud ◽  
G. Etienne ◽  
P. Peyron ◽  
M.-A. Laneelle ◽  
M. Daffe
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Enzyme Activities ◽  
Extracellular Enzyme ◽  
Extracellular Enzyme Activities

scholarly journals Extracellular Enzyme Activities of the Monokaryotic Strains Generated from Basidiospores of Shiitake Mushroom

Mycobiology ◽  
2008 ◽  
Vol 36 (1) ◽  
pp. 74 ◽  
Author(s):  
Hyuk Woo Kwon ◽  
In Joung Back ◽  
Han Gyu Ko ◽  
Chang Hyun You ◽  
Seong Hwan Kim
Keyword(s):  
Enzyme Activities ◽  
Extracellular Enzyme ◽  
Shiitake Mushroom ◽  
Extracellular Enzyme Activities

scholarly journals Response of <i>Nodularia spumigena</i> to <i>p</i>CO<sub>2</sub> – Part 2: Exudation and extracellular enzyme activities

2013 ◽  
Vol 10 (1) ◽  
pp. 567-582 ◽  
Author(s):  
S. Endres ◽  
J. Unger ◽  
N. Wannicke ◽  
M. Nausch ◽  
M. Voss ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Organic Matter ◽  
Enzyme Activities ◽  
Extracellular Enzymes ◽  
Extracellular Enzyme ◽  
High Pco2 ◽  
Nodularia Spumigena ◽  
Extracellular Enzyme Activities ◽  
Pco2 Treatment ◽  
Co2 Concentrations

Abstract. The filamentous and diazotrophic cyanobacterium Nodularia spumigena plays a major role in the productivity of the Baltic Sea as it forms extensive blooms regularly. Under phosphorus limiting conditions Nodularia spumigena have a high enzyme affinity for dissolved organic phosphorus (DOP) by production and release of alkaline phosphatase. Additionally, they are able to degrade proteinaceous compounds by expressing the extracellular enzyme leucine aminopeptidase. As atmospheric CO2 concentrations are increasing, we expect marine phytoplankton to experience changes in several environmental parameters, including pH, temperature, and nutrient availability. The aim of this study was to investigate the combined effect of CO2-induced changes in seawater carbonate chemistry and of phosphate deficiency on the exudation of organic matter, and its subsequent recycling by extracellular enzymes in a Nodularia spumigena culture. Batch cultures of Nodularia spumigena were grown for 15 days under aeration with low (180 μatm), medium (380 μatm), and high (780 μatm) CO2 concentrations. Obtained pCO2 levels in the treatments were on median 315, 353, and 548 μatm CO2, respectively. Extracellular enzyme activities as well as changes in organic and inorganic compound concentrations were monitored. CO2 treatment–related effects were identified for cyanobacterial growth, which in turn influenced the concentration of mucinous substances and the recycling of organic matter by extracellular enzymes. Biomass production was increased by 56.5% and 90.7% in the medium and high pCO2 treatment, respectively, compared to the low pCO2 treatment. In total, significantly more mucinous substances accumulated in the high pCO2 treatment, reaching 363 μg Xeq L−1 compared to 269 μg Xeq L−1 in the low pCO2 treatment. However, cell-specific rates did not change. After phosphate depletion, the acquisition of P from DOP by alkaline phosphatase was significantly enhanced. Alkaline phosphatase activities were increased by factor 1.64 and 2.25, respectively, in the medium and high compared to the low pCO2 treatment. We hypothesise from our results that Nodularia spumigena can grow faster under elevated pCO2 by enhancing the recycling of organic matter to acquire nutrients.

Soil extracellular enzyme activities under long-term fertilization management in the croplands of China: a meta-analysis

2019 ◽  
Vol 114 (2) ◽  
pp. 125-138 ◽  
Author(s):  
Fuhong Miao ◽  
Yuan Li ◽  
Song Cui ◽  
Sindhu Jagadamma ◽  
Guofeng Yang ◽  
...  
Keyword(s):  
Enzyme Activities ◽  
Meta Analysis ◽  
Extracellular Enzyme ◽  
Extracellular Enzyme Activities
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