scholarly journals Physiological Characterization of an Anaerobic Ammonium-Oxidizing Bacterium Belonging to the “Candidatus Scalindua” Group

2013 ◽  
Vol 79 (13) ◽  
pp. 4145-4148 ◽  
Author(s):  
Takanori Awata ◽  
Mamoru Oshiki ◽  
Tomonori Kindaichi ◽  
Noriatsu Ozaki ◽  
Akiyoshi Ohashi ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Ammonium Oxidation ◽  
Lower Growth ◽  
Content Type ◽  
Physiological Characterization ◽  
Phylogenetic Affiliation ◽  
Lower Growth Rate

ABSTRACTThe phylogenetic affiliation and physiological characteristics (e.g.,Ksand maximum specific growth rate [μmax]) of an anaerobic ammonium oxidation (anammox) bacterium, “CandidatusScalindua sp.,” enriched from the marine sediment of Hiroshima Bay, Japan, were investigated. “CandidatusScalindua sp.” exhibits higher affinity for nitrite and a lower growth rate and yield than the known anammox species.

scholarly journals Characterization of different microalgae cultivated in open ponds

2019 ◽  
Vol 41 (1) ◽  
pp. 37723 ◽  
Author(s):  
Dagon Manoel Ribeiro ◽  
Alessandro Minillo ◽  
Cinthia Aparecida De Andrade Silva ◽  
Gustavo Graciano Fonseca
Keyword(s):  
Growth Rate ◽  
Specific Growth ◽  
Dry Mass ◽  
Maximum Specific Growth Rate ◽  
Pseudokirchneriella Subcapitata ◽  
Western Region ◽  
Lipid Contents ◽  
The World ◽  
Main Fatty Acid

 Microalga is one of the main sources of biomasses for the production of biofuels in the 21st century. Many labs and industries around the world are seeking for more productive strains and better cultivation models. The aim of this work was to evaluate the growth and kinetic parameters of six microalgae, and the moisture and lipid contents and fatty acids profiles of the biomasses harvested at the end of each cultivation. The microalgae were isolated in the Mid-Western Region of Brazil cultivated in open pond systems. It was observed that among the six microalgae used in this work, Pseudokirchneriella subcapitata presented the higher maximum specific growth rate (μmax) (0.12 day-1). The microalgae Coelastrum sp. and P. subcapitata were the ones with the highest lipid contents, with approximately 20% of dry mass. The main fatty acid accumulated in these conditions was palmitic acid, with percentages of 59 to 69% for all microalgae evaluated. Other factors that had influenced results from cultivations in open ponds were discussed here. 

scholarly journals Persister Development by Borrelia burgdorferi PopulationsIn Vitro

2015 ◽  
Vol 59 (10) ◽  
pp. 6288-6295 ◽  
Author(s):  
John R. Caskey ◽  
Monica E. Embers
Keyword(s):  
Growth Rate ◽  
Borrelia Burgdorferi ◽  
Bacterial Infections ◽  
Minimum Bactericidal Concentration ◽  
Lag Phase ◽  
Lower Growth ◽  
Content Type ◽  
Lower Growth Rate ◽  
Input Cell

ABSTRACTDoxycycline is an antibiotic commonly used to treat Lyme disease and other bacterial infections. The MIC and minimum bactericidal concentration (MBC) forBorrelia burgdorferihave been investigated by different groups but were experimentally established in this study as a function of input cell density. We demonstrated thatB. burgdorferitreated in the stationary phase has a higher probability of regrowth following removal of antibiotic. In addition, we determined experimentally and mathematically that the spirochetes which persist posttreatment do not have a longer lag phase but exhibit a lower growth rate than untreated spirochetes. Finally, we found that treating the spirochetes by pulse-dosing did not eliminate growth or reduce the persister populationin vitro. From these data, we propose thatB. burgdorferipersister development is stochastic and driven by slowed growth.

scholarly journals ISOLATION AND CHARACTERIZATION OF PERITHECIAL DEVELOPMENT MUTANTS IN NEUROSPORA

Genetics ◽  
1978 ◽  
Vol 88 (1) ◽  
pp. 27-47
Author(s):  
Thomas E Johnson
Keyword(s):  
Growth Rate ◽  
Mating Type ◽  
Temperature Sensitive ◽  
Uv Mutagenesis ◽  
Lower Growth ◽  
Type Locus ◽  
Isolation And Characterization ◽  
Lower Growth Rate ◽  
Complementation Groups

ABSTRACT The isolation and characterization of mutants that block perithecial development in Neurospora crassa are described. Several classes of mutants have been isolated after UV mutagenesis, and those that block perithecial development when used as the female (protoperithecial) component of a cross have been further characterized. These mutants fall into 29 complementation groups. Twelve of the 33 mutants block development at the protoperithecial stage; no other clustering of block points is observed. Many of the mutants show an altered vegetative growth rate as well; in several mutants this lower growth rate cosegregates with the female sterile phenotype. Only one mutant also blocks development of the perithecium when used as the conidial parent. None of the mutants are temperature sensitive; two can be suppressed by growth on a complete crossing medium. There is no indication that the mutants are at or in the mating-type locus, nor are any of the mutants mating-type specific. Genetic mosaics have been formed using mixtures of mutant and marked wild-type nuclei; no mutants are cell autonomous by this criterion. The significance of these results in terms of "developmental" mutants isolated in other organisms and in relation to models of eukaryotic development is discussed.

E-beam irradiation affects the maximum specific growth rate ofBacillus cereus

2012 ◽  
Vol 48 (2) ◽  
pp. 382-386 ◽  
Author(s):  
Juan Aguirre ◽  
Mª Rosa Rodríguez ◽  
Rodrigo González ◽  
Gonzalo García de Fernando
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Beam Irradiation ◽  
Ofbacillus Cereus

Caecotrophes intake in growing rabbits estimated either from urinary excretion of purine derivatives or from direct measurement using animals provided with a neck collar: effect of type and level of dietary carbohydrate

2002 ◽  
Vol 74 (1) ◽  
pp. 135-144 ◽  
Author(s):  
A. Belenguer ◽  
J. Balcells ◽  
M. Fondevila ◽  
C. Torre
Keyword(s):  
Growth Rate ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Purine Derivatives ◽  
Lower Growth ◽  
Beet Pulp ◽  
Lower Growth Rate ◽  
Maize Grain ◽  
G Ratio ◽  
Microbial N

AbstractThe present study compares estimates of caecotrophes production from urinary purine derivatives (PD) excretion with that from preventing caecotrophy by using a neck collar. A total of 64 New Zealand growing male rabbits were used to study the effect of diet composition on caecotrophes production. Diets were formulated using two sources of structural carbohydrates (fibre): alfalfa hay (AH) and sugar-beet pulp (SBP), mixed at two constant proportions, (0·75: 0·25) AH diets and (0·25: 0·75) SBP diets. Both diets included either barley or maize grain at two fibre: grain ratios (F/G, 80: 20 and 45: 55). Diets were given ad libitum. Growth rate, dry matter intake and digestibility were not modified by the grain source, although high F/G diets resulted in a lower growth rate (19·8 v. 26·4 g/day; P < 0·001). Between fibre sources, dry-matter intake and growth were higher in AH than in SBP diets (122·5 and 25·6 v. 101·6 and 20·4 g/day, respectively, P < 0·001 and P < 0·01). Rabbits given high F/G ratio and AH diets excreted more caecotrophes than those given low F/G ratio and SBP diets (19·5 and 20·9 v. 16·3 and 14·85 g/day, respectively). Microbial-N recycling through the caecotrophy process was higher when considering data from PD excretion (1·33 g/d) than when estimated by preventing caecotrophy (0·72 g/day).

Maximum specific growth rate of anammox bacteria revisited

2017 ◽  
Vol 116 ◽  
pp. 296-303 ◽  
Author(s):  
Lei Zhang ◽  
Yuko Narita ◽  
Lin Gao ◽  
Muhammad Ali ◽  
Mamoru Oshiki ◽  
...  
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Maximum Specific Growth Rate ◽  
Anammox Bacteria

Shape evolution of a spherical particle growing in supersaturated solution affected by straining flows

2016 ◽  
Vol 30 (06) ◽  
pp. 1650059
Author(s):  
Jingjing Gao ◽  
Mingwen Chen ◽  
Zidong Wang
Keyword(s):  
Growth Rate ◽  
Expansion Method ◽  
Supersaturated Solution ◽  
Shape Evolution ◽  
Interface Microstructure ◽  
Lower Growth ◽  
Ambient Flow ◽  
Multiple Variable ◽  
Lower Growth Rate ◽  
Asymptotic Expansion Method

The convection of ambient flow field has a significant influence on the pattern formation of growing particles. In this paper, we investigate the shape evolution of particles growing in supersaturated solution affected by straining flows. By using the multiple variable asymptotic expansion method, we obtain the asymptotic solution. The solution indicates that the interface microstructure is greatly affected by the straining flows. The flow results in a higher growth rate in the surface where it is incoming and a lower growth rate where it is outgoing. Besides, the flow also has effects on the concentration distribution.

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