scholarly journals Dunaliella salina Teod. microalgae productivity, when grown under the different addition of carbon dioxide in culture

2017 ◽  
Vol 2 (2) ◽  
pp. 34-40 ◽  
Author(s):  
I. N. Gudvilovych ◽  
A. B. Borovkov
Keyword(s):  
Dunaliella Salina ◽  
Fluid Phase ◽  
Co2 Injection ◽  
Limiting Factor ◽  
Microalgae Cultivation ◽  
Plastic Tube ◽  
Mass Cultivation ◽  
Phase Surface ◽  
Microalgae Productivity ◽  
Selection Of

Lack of carbon can be the main limiting factor in microalgae cultivation, that is why selection of optimum way for carbon to be injected into the culture environment for a particular species and photobioreactor is critical for its mass cultivation. D. salina culture was grown in laboratory photobioreactors under day-and-night lamplight of 15 kLx. Air was supplied with the aquarium compressor at the rate of 0.8 l·l-1·min-1. In the first test, bubbling was arranged via capillary of 4 mm diameter; in the second test — via aquarium air sprayer (plastic tube 5 cm length, 5 mm diameter, pore size not more than 0.1 mm). D. salina potential for the microalgae mass cultivation through increase of specific air-fluid phase surface without additional CO2 injection into gas-air mixture) with maximum productivity of 0.34 g of dry biomass from 1 liter per day has been shown experimentally. Average productivity of the culture when grown in the proposed regime is 1.5 times lower than in standard approved case.

Selection of productive forms of microalgae for mass cultivation

2000 ◽  
Vol 2 (1) ◽  
pp. 102-112
Author(s):  
L. N. Tsoglin ◽  
O. Pulz ◽  
R. Storandt ◽  
A. Ya. Akyev
Keyword(s):  
Mass Cultivation ◽  
Selection Of

Marker-assisted identification of potential fertility restorers for the development of three-line hybrids in rice (Oryza sativa L.)

2020 ◽  
Vol 57 (3) ◽  
pp. 181-189
Author(s):  
Asma Majid ◽  
GA Parray ◽  
NR Sofi ◽  
Gazala H Khan ◽  
Showkat A Waza ◽  
...  
Keyword(s):  
Oryza Sativa L ◽  
Chromosome 1 ◽  
Limiting Factor ◽  
Kashmir Valley ◽  
Fertility Restorer ◽  
Yield And Quality ◽  
Restorer Genes ◽  
Increase Productivity ◽  
Fertility Restorers ◽  
Selection Of

Rice being a staple food crop of Kashmir valley, the focus is on enhancement of yield in order to meet the needs of ever-growing population.Identification of new parental lines is crucial for developing ecology-specific hybrids with ideal agronomic performance. Exploitation of heterosis in the form of hybrid rice technology can be one of the approaches to increase productivity in this crop, especially exploiting diversity among japonica lines can serve as an excellent route.A number of CMS lines suitable formountainous areas of Kashmir have been developed, however, the availability of promising restorer lines remains to be the major limitation for utilization of these lines.Identification of potential restorers acts as the main limiting factor for hybrid development in the Kashmir valley. Marker based screening for Rf3 and Rf4 fertility restorer genes can be helpful in rapid selection of restorer lines while dealing with the large quantity of genetic materials. In the present study, 100 rice germplasm were screened with the help of SSR markers, RM3148 and RM6100linked to Rf3 and Rf4 genes on chromosome 1 and 10, respectively. In total, 19 lines revealed the presence of both Rf3 and Rf4 genes. These lines amplified fertility restorer specific alleles for both the genes and may serve as potential restorers for obtaining heterotic rice hybrids. Further the germplasm lines were also evaluated for yield and quality traits.The present results would help in selection of suitable restorers along with preferred grain shape/size.

scholarly journals Molecular and phylogenetic analysis reveals new diversity of Dunaliella salina from hypersaline environments

2021 ◽  
pp. 1-11
Author(s):  
Andrea Highfield ◽  
Angela Ward ◽  
Richard Pipe ◽  
Declan C. Schroeder
Keyword(s):  
Genetic Diversity ◽  
Phylogenetic Analysis ◽  
Dunaliella Salina ◽  
Phylogenetic Analyses ◽  
Ssu Rdna ◽  
Lsu Rdna ◽  
Hypersaline Environments ◽  
Rdna Its ◽  
Β Carotene ◽  
Selection Of

Abstract Twelve hyper-β carotene-producing strains of algae assigned to the genus Dunaliella salina have been isolated from various hypersaline environments in Israel, South Africa, Namibia and Spain. Intron-sizing of the SSU rDNA and phylogenetic analysis of these isolates were undertaken using four commonly employed markers for genotyping, LSU rDNA, ITS, rbcL and tufA and their application to the study of Dunaliella evaluated. Novel isolates have been identified and phylogenetic analyses have shown the need for clarification on the taxonomy of Dunaliella salina. We propose the division of D. salina into four sub-clades as defined by a robust phylogeny based on the concatenation of four genes. This study further demonstrates the considerable genetic diversity within D. salina and the potential of genetic analyses for aiding in the selection of prospective economically important strains.

Eulerian Multi-Fluid Model of Air Blast Atomization

2006 ◽  
Author(s):  
Srimani Bhamidipati ◽  
Mahesh Panchagnula ◽  
John Peddieson
Keyword(s):  
Closed Form ◽  
Recurrence Relations ◽  
Model Problem ◽  
Fluid Model ◽  
Closed Form Solution ◽  
Fluid Phase ◽  
Form Solution ◽  
Air Blast ◽  
Carrier Fluid ◽  
Selection Of

The application of fully Eulerian "multi-fluid" models to air blast atomization is discussed. Such models envision the system as consisting one carrier fluid phase and multiple drop phases, each having a discrete size. A model problem is formulated which allows a general closed form solution in terms of recurrence relations. This closed form solution is employed to produce representative results. A selection of these is used to illustrate interesting aspects of the predictions.

scholarly journals Developing donors of ultra-early maturity in barley

2021 ◽  
Vol 181 (4) ◽  
pp. 83-92
Author(s):  
I. A. Zveinek ◽  
O. N. Kovaleva
Keyword(s):  
Yield Components ◽  
Growing Season ◽  
Climatic Conditions ◽  
Limiting Factor ◽  
Early Maturity ◽  
Norm Of Reaction ◽  
Hybrid Combination ◽  
Recessive Genes ◽  
Good Productivity ◽  
Selection Of

Background. The length of the growing season is a limiting factor in many regions with unstable climatic conditions. The development of ultra-early barley donors makes it possible to accelerate the breeding process aimed at producing commercial cultivars adapted to cultivation area requirements.Materials and methods. The donors Kibel, Kibel uluchshenny, Kibtsel and Kibkor were obtained through individual selection of barley forms combining earliness and productivity from the hybrid combination Belogorsky × k-15881. The experiments were carried out according to the approved guidelines. Yield components were used to calculate the index of productivity for the donors versus the reference cv. ‘Belogorsky’.Results and conclusions. Earliness is controlled in the donors by three recessive genes. The donors’ period from emergence to heading was 7–9 days shorter than that of the reference cv. ‘Belogorsky’, with a low norm of reaction, which attested to their high adaptability. The resulting barley forms were highly resistant to lodging. The donor Kibel uluchshenny in all spike yield components did not differ from the reference. The other donors were close to the reference in spike length and 1000 seed weight. The example of Kibel uluchshenny was used to demonstrate the possibility of producing barley forms combining high earliness and good productivity. The developed donors may prove useful in the breeding for earliness in the areas where the length of the growing season is a limiting factor. 

Spawning-habitat selection of an Indo-Pacific amphidromous gobiid fish, Sicyopterus lagocephalus (Pallas)

2013 ◽  
Vol 64 (11) ◽  
pp. 1058 ◽  
Author(s):  
Nils Teichert ◽  
Pierre Valade ◽  
Pierre Bosc ◽  
Marine Richarson ◽  
Philippe Gaudin
Keyword(s):  
Habitat Selection ◽  
Logistic Models ◽  
Sampling Procedure ◽  
Limiting Factor ◽  
Spawning Habitat ◽  
Gobiid Fish ◽  
Spawning Areas ◽  
Selection For ◽  
Geomorphic Units ◽  
Selection Of

Freshwater-fish populations of the Indo-pacific region are characterised by a large proportion of amphidromous species. We analysed the spawning-habitat selection of Sicyopterus lagocephalus (Gobiidae: Sicydiinae) within two rivers of the Reunion Island. Reproduction traces are rare events, so a presence-only sampling procedure was performed to collect egg clutches and a random description of available habitat was conducted to generate pseudo-absence data. Logistic models showed a strong selection for microhabitat variables and mesohabitat units. S. lagocephalus selected areas where availability of potential nests was high (small cobble to small boulder) and where interstitial substratum allowed intragravel flow. Our results suggest that the availability of favourable substratum may be a limiting factor, which could result in occupancy of suboptimal areas. Water depth and velocity had less of an effect on the selection of a spawning area. Higher selection for shallow (<60 cm) and lotic (>30 cm s–1) geomorphic units, with an optimum for riffle and cascade, suggested that mesohabitat could be a satisfactory approach to quickly assess the availability of spawning areas within a watercourse for expertise studies.

scholarly journals Denning Ecology of Wolves in East-Central Alaska, 1993–2017

ARCTIC ◽  
2018 ◽  
Vol 71 (4) ◽  
pp. 444-455 ◽  
Author(s):  
Kyle Joly ◽  
Mathew S. Sorum ◽  
Matthew D. Cameron
Keyword(s):  
Home Range ◽  
Focal Point ◽  
Average Distance ◽  
Limiting Factor ◽  
Site Location ◽  
East Central ◽  
Gray Wolves ◽  
National Preserve ◽  
And Control ◽  
Selection Of

 Dens are a focal point in the life history and ecology of gray wolves (Canis lupus), and their location can influence access to key resources, productivity, survivorship, and vulnerability to hunting, trapping, and control efforts. We analyzed the selection of den sites and the phenology of their use inside the Yukon-Charley River National Preserve from 1993 to 2017 to enhance our understanding of this resource. At the landscape scale, we found that wolves in east-central Alaska selected den sites that were lower in elevation, snow free earlier in the spring, exposed to greater solar radiation, and closer to water. Den sites were also associated with areas that had burned less recently and had lower terrain ruggedness at the 1 km scale. These results supported our hypothesis that wolves would den relatively close to essential resources (water and prey) and in areas that are drier (melt earlier) in the spring. At the home range scale, wolves also selected den sites at lower elevations and showed a strong selection for the center of their home range. Furthermore, the average distance between active den sites was 37.3 km, which is slightly greater than the average radius (32.5 km) of a home range of a pack. Our results support our hypothesis that dynamic social factors modulate the selection of environmental factors for den site location. Wolves den away from other packs to reduce competition and exposure to intraspecific conflict. High-quality denning habitat does not currently appear to be a limiting factor for this population. Females, on average, entered their dens on 10 May, stayed inside the den for eight days, and remained less than 1 km from the den for an additional six days after emerging. We found that wolves denning at higher elevations entered their dens later than those at lower elevations, which also supported one of our hypotheses. Lastly, we documented limited evidence of earlier denning over time. Long-term monitoring projects, such as ours, are critical in identifying these types of trends.

scholarly journals INFLUENCE OF AGROMETEOROLOGICAL CONDITIONS ON PRODUCTIONAL PROCESS OF THE NORTH ECOTYPE SOYBEAN

2020 ◽  
pp. 15-21
Author(s):  
М. Е. Belyshkina ◽  
Keyword(s):  
Weather Condition ◽  
Growing Season ◽  
Limiting Factor ◽  
Temperature Minimum ◽  
Critical Periods ◽  
Weak Reaction ◽  
Ecological Adaptability ◽  
The North ◽  
Experimental Facilities ◽  
Selection Of

Soybean has ecological adaptability caused by deep selection of this culture in terms of particular characteristics of growing zone. In this respect it demands higher standards of warmth and moistness, especially in particular “critical” periods. The research aim is to determine degree of impact of agrometeorological conditions of growing season on productional process of soybean varieties of the north ecotype. The experiments were carried out in 2017–2019 on experimental facilities of ISA FSAC VIM with varieties of Magev, Svetlaya and Georgia. Phenological observations were conducted; temperature- humidity conditions of growing season were measured. Limiting factor in particular critical periods of soybean growing and development in the Ryazan region is moisture problem. Lower threshold of dynamic daily mean temperature up to 15–17оС is formed to mid- May, but hereby drought conditions often take place. Biological temperature minimum keeps throughout growth and development, and if anomalous periods of drought or overwetting don’t begin, north ecotype soybean varieties ripe in August- breaking of September. North ecotype soybean varieties are able to form straight yield in the Ryazan region. In this respect Kasatka variety showed weak reaction on the change of agroclimatic conditions, which had shortest growing season and yield on the level of 1,00 t/ha. Georgia variety responded better to weather condition changes, its yield varied by year of research from 1,24 to 1,72 t/ha. Magev and Svetlaya varieties fall in between.

scholarly journals Brachiaria spp. poisoning of ruminants in Brazil

2011 ◽  
Vol 31 (3) ◽  
pp. 183-192 ◽  
Author(s):  
B. Riet-Correa ◽  
M.B. Castro ◽  
R.A. Lemos ◽  
G. Riet-Correa ◽  
V. Mustafa ◽  
...  
Keyword(s):  
Weight Loss ◽  
Animal Species ◽  
Preventive Measures ◽  
Clinical Signs ◽  
Clinical Syndrome ◽  
Limiting Factor ◽  
Serum Concentrations ◽  
Cattle Production ◽  
Progressive Weight Loss ◽  
Selection Of

Brachiaria species are the most important grasses for cattle production in Brazil. However, a limiting factor for the use of Brachiaria spp. is their toxicity. Most outbreaks of hepatogenous photosensitization are caused by B. decumbens; however B. brizantha, B. humidicola and B. ruziziensis can also cause poisoning. The poisoning affects cattle, sheep, goats and buffalo. Sheep are more susceptible than other animal species and the young are more susceptible than adults. There are differences in susceptibility among animals of the same species and it has been suggested that this resistance is genetic. Also has been suggested that buffalo and probably some sheep are resilient, i.e. when poisoned these animals have histologic lesions and high GGT serum concentrations, but do not show clinical signs. In general, saponin concentrations are higher in growing plants, but outbreaks occur all over the year, probably due to unexplained rise in saponin concentration in the plant. A clinical syndrome of progressive weight loss and death, without photosensitization, has been reported in cattle poisoned by B. decumbens. Main preventive measures are based on the selection of resistant or resilient animals and on the development of Brachiaria species or varieties with low saponin concentration.

Plant genotype, juvenility and mechanisms of inhibition of rooting Persoonia virgata R. Br. Cuttings

1999 ◽  
Vol 39 (8) ◽  
pp. 1029 ◽  
Author(s):  
L. M. Bauer ◽  
M. E. Johnston ◽  
R. R. Williams
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Root Formation ◽  
Limiting Factor ◽  
Genotypic Differences ◽  
Stock Plant ◽  
Plant Genotype ◽  
Rooted Cuttings ◽  
Selection Of ◽  
Better Than

Summary. Persoonia virgata is an endemic shrub of Australia that is being bush-harvested for its foliage and sold on the domestic and export flower markets. The limiting factor to the cultivation of many desirable Persoonia species has been the extreme difficulty in developing a reliable propagation system. This study investigated the effects of cutting type, maturity of the stock plant, and genotype, on the rooting of P. virgata cuttings. It was found that juvenile cuttings rooted significantly better than mature cuttings. Some juvenile seedling genotypes yielded no rooted cuttings, whereas others produced up to 90% rooting. No anatomical barrier to root formation was discovered. High performance liquid chromatography showed differences in the abundance of unidentified compounds in cuttings, related to season and to genotypic differences in rooting abilities. A possible seasonal rooting inhibitor was present in some genotypes. The potential for selection of genotypes with improved rooting ability has been demonstrated.

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