Silver Nanoparticle Impact on Bacterial Growth: Effect of pH, Concentration, and Organic Matter

2009 ◽  
Vol 43 (19) ◽  
pp. 7285-7290 ◽  
Author(s):  
Julia Fabrega ◽  
Shona R. Fawcett ◽  
Joanna C. Renshaw ◽  
Jamie R. Lead
Keyword(s):  
Organic Matter ◽  
Bacterial Growth ◽  
Silver Nanoparticle ◽  
Growth Effect ◽  
Effect Of Ph ◽  
Ph Concentration

scholarly journals Response of heterotrophic and autotrophic microbial plankton to inorganic and organic inputs along a latitudinal transect in the Atlantic Ocean

2010 ◽  
Vol 7 (5) ◽  
pp. 1701-1713 ◽  
Author(s):  
S. Martínez-García ◽  
E. Fernández ◽  
A. Calvo-Díaz ◽  
E. Marañón ◽  
X. A. G. Morán ◽  
...  
Keyword(s):  
Organic Matter ◽  
Atlantic Ocean ◽  
Bacterial Growth ◽  
Heterotrophic Bacteria ◽  
Growth Efficiency ◽  
Bacterial Growth Efficiency ◽  
Organic Nutrient ◽  
Plankton Biomass ◽  
Latitudinal Transect ◽  
Microbial Plankton

Abstract. The effects of inorganic and/or organic nutrient inputs on phytoplankton and heterotrophic bacteria have never been concurrently assessed in open ocean oligotrophic communities over a wide spatial gradient. We studied the effects of potentially limiting inorganic (nitrate, ammonium, phosphate, silica) and organic nutrient (glucose, aminoacids) inputs added separately as well as jointly, on microbial plankton biomass, community structure and metabolism in five microcosm experiments conducted along a latitudinal transect in the Atlantic Ocean (from 26° N to 29° S). Primary production rates increased up to 1.8-fold. Bacterial respiration and microbial community respiration increased up to 14.3 and 12.7-fold respectively. Bacterial production and bacterial growth efficiency increased up to 58.8-fold and 2.5-fold respectively. The largest increases were measured after mixed inorganic-organic nutrients additions. Changes in microbial plankton biomass were small as compared with those in metabolic rates. A north to south increase in the response of heterotrophic bacteria was observed, which could be related to a latitudinal gradient in phosphorus availability. Our results suggest that organic matter inputs will result in a predominantly heterotrophic versus autotrophic response and in increases in bacterial growth efficiency, particularly in the southern hemisphere. Subtle differences in the initial environmental and biological conditions are likely to result in differential microbial responses to inorganic and organic matter inputs.

Effect Of pH on the complexation of U(II) with organic matter dissolved in resh waters

1994 ◽  
Vol 46 (4) ◽  
pp. 223-228
Author(s):  
Juan M. Antelo ◽  
Florencio Arce ◽  
Francisco J. Penedo ◽  
Rocio López
Keyword(s):  
Organic Matter ◽  
Effect Of Ph

scholarly journals Sources and composition of organic matter for bacterial growth in a large European river floodplain system (Danube, Austria)

2009 ◽  
Vol 40 (3) ◽  
pp. 321-331 ◽  
Author(s):  
Katharina Besemer ◽  
Birgit Luef ◽  
Stefan Preiner ◽  
Birgit Eichberger ◽  
Martin Agis ◽  
...  
Keyword(s):  
Organic Matter ◽  
Bacterial Growth ◽  
River Floodplain

Characterisation of biodegradable organic matter in reclaimed water using a bacterial growth fingerprint assay

2016 ◽  
Vol 16 (5) ◽  
pp. 1255-1265 ◽  
Author(s):  
Parinda Thayanukul ◽  
Futoshi Kurisu ◽  
Ikuro Kasuga ◽  
Kizuku Kanaya ◽  
Hiroaki Furumai
Keyword(s):  
Organic Matter ◽  
Bacterial Growth ◽  
Reclaimed Water ◽  
Maximum Growth ◽  
Bacterial Strains ◽  
Operational Conditions ◽  
Assimilable Organic Carbon ◽  
The Difference ◽  
Microbial Regrowth ◽  
Biodegradable Organic Matter

Microbial regrowth, microbial growth after disinfection, is an important problem that deteriorates water quality during the storage and distribution of reclaimed water. Biodegradable organic matter (BOM) that remains after water reclamation processes directly promotes microbial regrowth. In this study we propose a novel assay called the ‘bacterial growth fingerprint (BGF)’ to characterise BOM based on the maximum growth of bacterial strains, which is the extension of the conventional assimilable organic carbon assay for drinking water. Nine bacterial strains were selected from nearly 200 isolates from various reclaimed water systems. These selected bacterial strains exhibited unique substrate utilisation patterns. The BGF assay clearly reflected the difference in the quantity and quality of BOM between six different reclamation plants and the changes in BOM during a full-scale reclamation process. The information on BOM revealed by the BGF assay is useful to optimise the treatment processes or operational conditions for biologically stable reclaimed water.

scholarly journals Limitation of Bacterial Growth by Dissolved Organic Matter and Iron in the Southern Ocean

2000 ◽  
Vol 66 (2) ◽  
pp. 455-466 ◽  
Author(s):  
Matthew J. Church ◽  
David A. Hutchins ◽  
Hugh W. Ducklow
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Southern Ocean ◽  
Bacterial Growth ◽  
Bacterial Biomass ◽  
Biomass Accumulation ◽  
Growth Efficiency ◽  
Bacterial Growth Efficiency ◽  
Leucine Incorporation ◽  
Mean Cell Volume

ABSTRACT The importance of resource limitation in controlling bacterial growth in the high-nutrient, low-chlorophyll (HNLC) region of the Southern Ocean was experimentally determined during February and March 1998. Organic- and inorganic-nutrient enrichment experiments were performed between 42°S and 55°S along 141°E. Bacterial abundance, mean cell volume, and [3H]thymidine and [3H]leucine incorporation were measured during 4- to 5-day incubations. Bacterial biomass, production, and rates of growth all responded to organic enrichments in three of the four experiments. These results indicate that bacterial growth was constrained primarily by the availability of dissolved organic matter. Bacterial growth in the subtropical front, subantarctic zone, and subantarctic front responded most favorably to additions of dissolved free amino acids or glucose plus ammonium. Bacterial growth in these regions may be limited by input of both organic matter and reduced nitrogen. Unlike similar experimental results in other HNLC regions (subarctic and equatorial Pacific), growth stimulation of bacteria in the Southern Ocean resulted in significant biomass accumulation, apparently by stimulating bacterial growth in excess of removal processes. Bacterial growth was relatively unchanged by additions of iron alone; however, additions of glucose plus iron resulted in substantial increases in rates of bacterial growth and biomass accumulation. These results imply that bacterial growth efficiency and nitrogen utilization may be partly constrained by iron availability in the HNLC Southern Ocean.

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