Studies on the relationship between specific growth rate and concentration of nitrogen source for heterogeneous microbial populations of sewage origin

1969 ◽  
Vol 11 (1) ◽  
pp. 67-78 ◽  
Author(s):  
K. C. Goel ◽  
A. F. Gaudy
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Nitrogen Source ◽  
Specific Growth ◽  
Microbial Populations ◽  
The Relationship

The relationship between specific growth rate and swimming performance in male fathead minnows (Pimephales promelas)

1995 ◽  
Vol 73 (11) ◽  
pp. 2165-2167 ◽  
Author(s):  
Alan S. Kolok ◽  
James T. Oris
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Swimming Speed ◽  
Specific Growth ◽  
Swimming Performance ◽  
Pimephales Promelas ◽  
Significant Negative Correlation ◽  
Fathead Minnows ◽  
Critical Swimming Speed ◽  
The Relationship

The objective of this study was to test the hypothesis that the specific growth rate of male fathead minnows (Pimephales promelas) was positively correlated with swimming performance. Subadult fish were allowed to grow into adults over a period of 31 – 55 days, after which the critical swimming speed of each fish was determined. Variation in critical swimming speed was substantial (greater than 50%), and a significant positive correlation was found between number of growing days and critical swimming speed, whereas a significant negative correlation was found between specific growth rate and critical swimming speed. A multiple regression using specific growth rate and number of growing days explained over 47% of the variation in swimming performance. Fathead minnows that grow fast are poor swimmers, suggesting a trade-off between swimming performance and specific growth rate in this species.

Impact of Nitrogen Source on the Growth, Specific Growth Rate and Lipid Synthesis of Monoraphidium sp.FXY-10 under Different Culture Conditions

2013 ◽  
Vol 864-867 ◽  
pp. 71-78
Author(s):  
Ke Ding ◽  
Tao Li ◽  
Peng Zhao ◽  
Lin Wang ◽  
Xu Ya Yu
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Nitrogen Source ◽  
Lipid Content ◽  
Specific Growth ◽  
Lipid Synthesis ◽  
Culture Conditions ◽  
Optimal Conditions ◽  
Maximum Biomass ◽  
The Impact

The NaNO3concentration influencing the growth and lipid synthesis ofMonoraphidiumsp.FXY-10 under three cultures (autotrophy, heterotrophy and mixotrophy) was studied through flask-shaking experiment. Additionally, the impact of nitrogen source on the growth and lipid content ofMonoraphidiumsp.FXY-10 was investigated. The NaNO3concentration for maximum biomass and highest lipid content ofMonoraphidiumsp.FXY-10 was obtained and the optimal conditions for its N absorption were concluded through the Andrew model.

scholarly journals Cultivation of Chlorella sp. as Biofuel Sources in Palm Oil Mill Effluent (POME)

2012 ◽  
Vol 1 (2) ◽  
pp. 45-49 ◽  
Author(s):  
H Hadiyanto ◽  
Muhamad Maulana Azimatun Nur ◽  
Ganang Dwi Hartanto
Keyword(s):  
Growth Rate ◽  
Renewable Energy ◽  
Specific Growth Rate ◽  
Nitrogen Source ◽  
Palm Oil ◽  
Specific Growth ◽  
Urea Concentration ◽  
Palm Oil Mill Effluent ◽  
Chlorella Sp ◽  
Palm Oil Mill

Renewable energy is essential and vital aspect for development in Indonesia especially less oil reserve for coming 15 years. Biodiesel has received much attention as renewable energy in recent years. One of potential biodiesel is produced from microalgae. Due to high content of nutrients in Palm Oil Mill Effluent (POME), this waste is a potential for nutrient growth for microalgae. Chlorella is one of high potential for biodiesel since it has high lipid content (20-30%). The objective of the research is to determine growth rate and biomass productivity in Chlorella Sp cultured in POME. Chlorella Sp was cultured in 20%, 50%, 70% POME using urea concentration 0.1gr/L (low nitrogen source) and 1gr/l (high nitrogen source) at flask disk, pH 6.8-7.2; aerated using aquarium pump and fluorescence lamp 3000-6000 lux as light. Medium was measured using spectrophotometer Optima Sp-300 OD at 680 wave length in 15 days to calculate specific growth rate. At end of cultivation, Chlorella sp was filtered and measured as dry weight. Result indicated that Chlorella sp at 50% POME 1gr/L urea showed higher specific growth rate (0.066/day). Factor affecting growth rate of microalgae is CNP ratio, POME concentration, and urea concentration.

scholarly journals Determination of Specific Growth Rate by Measurement of Specific Rate of Ribosome Synthesis in Growing and Nongrowing Cultures of Acinetobacter calcoaceticus

2007 ◽  
Vol 74 (3) ◽  
pp. 901-903 ◽  
Author(s):  
Matthew R. Cutter ◽  
Peter G. Stroot
Keyword(s):  
Growth Rate ◽  
16S Rrna ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Acinetobacter Calcoaceticus ◽  
Microbial Populations ◽  
Specific Rate ◽  
Ribosome Synthesis ◽  
Good Agreement

ABSTRACT RT-RiboSyn measures the specific rate of ribosome synthesis in distinct microbial populations by measuring the generation rate of precursor 16S rRNA relative to that of mature 16S rRNA when precursor 16S rRNA processing is inhibited. Good agreement was demonstrated between specific rate of ribosome synthesis and specific growth rate of Acinetobacter calcoaceticus.

Effects of N/P Atomic Ratio on the Growth of Alexandrium Tamarense at Various Initial Phosphate Concentrations

2012 ◽  
Vol 455-456 ◽  
pp. 1289-1296
Author(s):  
Shi Yong Wen ◽  
Dong Zhi Zhao ◽  
Li Li Song ◽  
Hua Long
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Cell Density ◽  
Specific Growth ◽  
Red Tide ◽  
Atomic Ratio ◽  
Maximum Specific Growth Rate ◽  
Alexandrium Tamarense ◽  
Nutrient Input ◽  
The Relationship

To reveal the relationship between nutrient input and red tide outbreaks, the effects of N/P atomic ratio on the specific growth rate of Alexandrium tamarense is analyzed under various initial phosphate concentrations in laboratory cultures. The results show that both the cell density and the specific growth rate of A.tamarense first increased when the N/P atomic ratio ≤ (N/P)opt and then decreased when the N/P atomic ratio ≥ (N/P)opt in low-P-grown cultures, followed by those in medium-P-grown and high-P-grown cultures. And the highest cell density in low-P-grown, medium-P-grown, and high-P-grown cultures is 1776×104, 4094×104 and 6891×104 cells/L, respectively. The maximum specific growth rate is 4.022, 5.307 and 9.672 d-1, respectively. It seems that the higher the initial phosphate concentrations, the greater the probability of red tide outbreaks.

scholarly journals The Relationship Between the Biokinetic Parameters of an Aerobic Granular Sludge System and the Applied Operating Conditions

2021 ◽  
Vol 31 (1) ◽  
pp. 161-171
Author(s):  
Nur Ain Hamiruddin ◽  
Nik Azimatolakma Awang
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Biomass Production ◽  
Specific Growth ◽  
Granular Sludge ◽  
Maximum Specific Growth Rate ◽  
Operating Conditions ◽  
Aerobic Granular Sludge ◽  
Biokinetic Parameters ◽  
The Relationship

Abstract Biokinetic parameters help to describe the rate of substrate utilization and biomass production or growth by microbial action, which is important to the design process and performance optimization of wastewater treatment. Although studies of the biokinetic parameters of aerobic granular sludge (AGS) systems have been increasing lately, the significance for each value in terms of maximum specific growth rate (μmax), substrate concentration at one-half of the maximum specific growth rate (KS), and cell yield (Y) in relation to the applied operating conditions are rarely discussed. Therefore, this study investigates the relationship and significance between the above-stated biokinetic parameters with organic loading rate (OLR) and reactor height/diameter (H/D) ratio from five different batches of AGS treated sewage, using the independent t-test. The biokinetic parameters are summarized as biomass production (Y and μmax ) and relied upon the relative increase in the OLR and reactor H/D ratios. Additionally, aerobic granules developed in reactors with a high H/D ratio have a shorter setup time and are more active in contrast with low H/D ratio reactors.

scholarly journals Degradation of o-xylene by a novel strain, Zoogloearesiniphila HJ1: Identification, kinetics and metabolic pathway

2017 ◽  
Vol 19 (2) ◽  
pp. 241-250
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Ring Cleavage ◽  
Yield Coefficient ◽  
Metabolic Intermediates ◽  
Haldane Model ◽  
Catechol 1,2 Dioxygenase ◽  
The Relationship

Biodegradation has become a popular alternative remediation technology due to its economical and ecological advantages. A strain able to degrade o-xylene effectively was selected and identified as Zoogloearesiniphila HJ1. The organism, strain HJ1, could degrade o-xylene with concentration as high as 256 mg L–1 at pH 6.8 and 26.3 °C. The Haldane model adequately described the relationship between specific growth rate and substrate concentration. The maximum specific growth rate and yield coefficient were 0.118 h-1 and 0.2572, respectively. A high mineralization rate of 67.9% was observed. Theenzyme activity and metabolic intermediates analysis showed that the ring cleavage of o-xylene was catalyzed by catechol 1,2-dioxygenase, and 3,4-dimethylcatechol was the main metabolic product. The present study demonstrated that the isolated strain, Zoogloearesiniphila HJ1, had a great application prospect for remediation of o-xylene-contaminated environment.

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