Influence of substrate composition and flow rate on growth ofAzospirillum brasilenseCd in a co-culture with 3 sorghum rhizobacteria

2004 ◽  
Vol 50 (10) ◽  
pp. 861-867 ◽  
Author(s):  
Daniela Lippi ◽  
Maria Rita De Paolis ◽  
Elena Di Mattia ◽  
Tito Pietrosanti ◽  
Isabella Cacciari
Keyword(s):  
Flow Rate ◽  
Growth Rates ◽  
Azospirillum Brasilense ◽  
High Growth ◽  
Niche Overlap ◽  
Competitive Behavior ◽  
Bacterial Strains ◽  
Biolog System ◽  
Influence Of Substrate ◽  
Disodium Succinate

The ability of Azospirillum brasilense Cd to colonize the niche occupied by 3 bacterial strains previously isolated from sorghum rhizosphere was studied by means of the Biolog system. The isolates were identified by different methods as strains belonging to Pseudomonas putida, Stenotrophomonas maltophilia, and Klebsiella terrigena species. Several C sources, also chosen among the constituents of sorghum root exudates, were used to evaluate the metabolic profiles of Azospirillum and the sorghum rhizobacteria. Azospirillum brasilense Cd exploited the same class of C compounds as the sorghum rhizobacteria and overlapped in their niche requirements. Since structure and functioning of a microbial community are largely affected by the flow rate of nutrient supply, the competitive behavior of A. brasilense Cd was studied in a chemostat mixed culture under C-limited conditions using disodium succinate as C source. Only at high growth rates, i.e., when the C source was highly supplied, A. brasilense Cd appeared to be a good competitor and it became the dominant species, whereas at low growth rates, it was outnumbered by the other species. However, the coexistence of all the strains was always maintained, thus suggesting that interactions other than competition or a potential cross-feeding might occur within the mixed culture.Key words: Azospirillum brasilense, competition, metabolic profile, niche overlap, sorghum rhizobacteria.

GROWTH OF PIKE-PERCH SANDER LUCIOPERCA (L., 1758) (PERCIDAE) IN RESERVOIRS OF K. SATPAYEV’S CHANNEL

2018 ◽  
pp. 59-68
Author(s):  
Saule Zhangirovna Asylbekova ◽  
Kuanysh Baibulatovich Isbekov ◽  
Vladimir Nickolaevich Krainyuk
Keyword(s):  
Growth Rates ◽  
Growth Dynamics ◽  
High Growth ◽  
Water Bodies ◽  
Volga River ◽  
Trophic Resources ◽  
Pike Perch ◽  
The Amur River ◽  
Back Calculation ◽  
Abiotic And Biotic Factors

Pike-perch is an invader for the water basins of Central Kazakhstan. These species have stable self-reproductive populations in the regional waters. Back calculation method was used to investigate pike-perch growth rates in reservoirs of K. Satpayev’s channel. For comparison, the data from the other water bodies (Vyacheslavsky and Sherubay-Nurinsky water reservoirs) were used, as well as literature data. Pike-perch species from the investigated waters don’t show high growth rates. The populations from the reservoirs of K. Satpayev’s channel have quite similar growth rates with populations from the Amur river, from a number of reservoirs in the Volga river basin and from the reservoir in Spain. Sexual differences in growth have not been observed. Evaluating possible influence of various abiotic and biotic factors on the growth rate of pike-perch in the reservoirs of K. Satpayev’s channel was carried out. It has been stated that the availability of trophic resources cannot play a key role in growth dynamics because of their high abundance. Morphology of water bodies also does not play a role, as well as chromaticity, turbidity and other optical water indicators. It can be supposed that the main factor influencing growth of pike perch is the habitat’s temperature. This factor hardly ever approaches optimal values for the species in reservoirs of K. Satpaev’s channel. The possible influence of fishing selectivity on pike-perch growth rates was also evaluated. Currently, there has been imposed a moratorium on pike-perch catch. However, pike-perch is found in by-catches and in catches of amateur fishermen. It should be said that such seizures have an insignificant role in the dynamics of growth rates.

Biology of Gadus morhua in Ogac Lake, a Landlocked Fiord on Baffin Island

1967 ◽  
Vol 24 (12) ◽  
pp. 2573-2594 ◽  
Author(s):  
David G. Patriquin
Keyword(s):  
Growth Rates ◽  
Gadus Morhua ◽  
Environmental Variability ◽  
Sea Urchins ◽  
High Growth ◽  
Baffin Island ◽  
Meristic Characters ◽  
Large Size ◽  
Fin Ray ◽  
High Length

Gadus morhua L. occurs in Ogac Lake, a salt, meromictic lake on Baffin Island that receives influxes of seawater only during the highest summer tides. Cod of the order of 10,000 of lengths 25 cm and greater and 500 of lengths greater than 60 cm were present. The size ranges for various ages far exceeded those of oceanic populations. Feeding conditions were poor, and sea urchins predominated in the diet. Large cod (greater than 50 cm) were highly cannibalistic, and it was estimated that they consume of the order of 3500 fish of 20–40 cm annually. Maturation occurred at the unusually large size of 85 cm in females, and at about 65 cm in males. Apparently many of the cod never reach these sizes. Spawning was from late May to early July in 1962, and initiation of spawning appeared to be related to light. The hatching of cod larvae coincided with the appearance of the nauplii of the dominant copepod in the lake. Egg size was highly variable and exhibited a curious bimodalism. Variation in vertebral and fin-ray counts was slight in spite of high environmental variability, and thus appears largely genetically controlled. Possibly the first inhabitants came from Greenland stocks, which have high growth rates similar to the faster growing cod in the lake, and similar high length at maturity. Meristic characters also suggest affinity with Greenland rather than Labrador cod. The hydrography of the area and the possibilities of larval drift or adult migration into the lake are discussed. Cannibalism must exert continuing selection for high growth rates, but very poor feeding conditions and hierarchial dominance effects probably prevent general attainment of high growth rates.

Thin, high quality GaInP compositionally graded buffer layers grown at high growth rates for metamorphic III–V solar cell applications

2014 ◽  
Vol 393 ◽  
pp. 64-69 ◽  
Author(s):  
I. Garcia ◽  
R.M. France ◽  
J.F. Geisz ◽  
J. Simon
Keyword(s):  
Solar Cell ◽  
Growth Rates ◽  
High Growth ◽  
Buffer Layers ◽  
High Quality

Amorphous silicon deposited at high growth rates near the onset of microcrystallinity

2000 ◽  
Vol 266-269 ◽  
pp. 450-454 ◽  
Author(s):  
Yoram Lubianiker ◽  
Yanyang Tan ◽  
J.David Cohen ◽  
Gautam Ganguly
Keyword(s):  
Amorphous Silicon ◽  
Growth Rates ◽  
High Growth

Very High Growth Rate of 4H-SiC Using MTS as Chloride-Based Precursor

2008 ◽  
Vol 600-603 ◽  
pp. 115-118 ◽  
Author(s):  
Henrik Pedersen ◽  
Stefano Leone ◽  
Anne Henry ◽  
Franziska Christine Beyer ◽  
Vanya Darakchieva ◽  
...  
Keyword(s):  
Growth Rate ◽  
Linear Dependence ◽  
Growth Rates ◽  
Molar Fraction ◽  
High Growth ◽  
High Growth Rate ◽  
Epitaxial Layers ◽  
Single Precursor ◽  
Very High

The chlorinated precursor methyltrichlorosilane (MTS), CH3SiCl3, has been used to grow epitaxial layers of 4H-SiC in a hot wall CVD reactor, with growth rates as high as 170 µm/h at 1600°C. Since MTS contains both silicon and carbon, with the C/Si ratio 1, MTS was used both as single precursor and mixed with silane or ethylene to study the effect of the C/Si and Cl/Si ratios on growth rate and doping of the epitaxial layers. When using only MTS as precursor, the growth rate showed a linear dependence on the MTS molar fraction in the reactor up to about 100 µm/h. The growth rate dropped for C/Si < 1 but was constant for C/Si > 1. Further, the growth rate decreased with lower Cl/Si ratio.

Liquid fuel production via supercritical water gasification of algae: a role for solar heat integration?

2021 ◽  
Author(s):  
Mahesh Brahmadesham Venkataraman ◽  
Alireza Rahbari ◽  
Philip J van Eyk ◽  
Alan W. Weimer ◽  
Wojciech Lipiński ◽  
...  
Keyword(s):  
Supercritical Water ◽  
Growth Rates ◽  
Algal Biomass ◽  
Liquid Fuel ◽  
Arable Land ◽  
High Growth ◽  
Heat Integration ◽  
Fuel Production ◽  
Supercritical Water Gasification ◽  
Artificial Ponds

Algal biomass is an attractive feedstock for carbon-neutral fuel production due to high growth rates and its potential to be farmed in artificial ponds on non-arable land. Supercritical water gasification...

Characterization of β-Ga2O3 homoepitaxial films and MOSFETs grown by MOCVD at high growth rates

2021 ◽  
Author(s):  
Marko J. Tadjer ◽  
Fikadu Alema ◽  
Andrei Osinsky ◽  
Michael Mastro ◽  
Neeraj Nepal ◽  
...  
Keyword(s):  
Growth Rates ◽  
High Growth

Abnormal High Growth Rates of Metastable Aluminas on FeCrAl Alloys

2005 ◽  
Vol 64 (1-2) ◽  
pp. 63-97 ◽  
Author(s):  
H. El. Kadiri ◽  
R. Molins ◽  
Y. Bienvenu ◽  
M. F. Horstemeyer
Keyword(s):  
Growth Rates ◽  
High Growth ◽  
Fecral Alloys

scholarly journals Population and biological parameters of selected fish species from the middle Xingu River, Amazon Basin

2015 ◽  
Vol 75 (3 suppl 1) ◽  
pp. 112-124 ◽  
Author(s):  
M. Camargo ◽  
T. Giarrizzo ◽  
VJ. Isaac
Keyword(s):  
Fish Species ◽  
Growth Rates ◽  
Amazon Basin ◽  
High Growth ◽  
Life Cycles ◽  
Biological Parameters ◽  
High Productivity ◽  
Xingu River ◽  
Biological Yield ◽  
Belo Monte

Abstract This study estimates the main biological parameters, including growth rates, asymptotic length, mortality, consumption by biomass, biological yield, and biomass, for the most abundant fish species found on the middle Xingu River, prior to the construction of the Belo Monte Dam. The specimens collected in experimental catches were analysed with empirical equations and length-based FISAT methods. For the 63 fish species studied, high growth rates (K) and high natural mortality (M) were related to early sexual maturation and low longevity. The predominance of species with short life cycles and a reduced number of age classes, determines high rates of stock turnover, which indicates high productivity for fisheries, and a low risk of overfishing.

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