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  • Immunocytochemistry
  • growth
  • pharmacokinetics
  • 2015-2019  (1)
  • 1985-1989  (389)
  • 1975-1979
  • 2018  (1)
  • 1988  (186)
  • 1987  (203)
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  • 2015-2019  (1)
  • 1985-1989  (389)
  • 1975-1979
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  • 1
    Publication Date: 2021-05-19
    Description: In the present study, an in vitro brain cell culture was developed from neural cells of Persian sturgeon (Acipenser persicus). The tissue samples collected from the anterior, middle and posterior regions of the brain were cultivated separately in DMEM/F12 medium supplemented with 15% fetal bovine serum, antibiotic and antimycotic. The medium was refreshed every 3 days. The cells became confluent after about 3 weeks from the initial time of seeding. The cultured cells from the posterior part of the brain showed high potential of proliferation as they had been passaged 16 times in more than 11 months. To determine optimal temperature, the brain cells were incubated at four temperatures including; 20, 22, 25 and 28°C. The best cultivation temperature was obtained at 25°C. The cultured cells from posterior part of the brain were cryopreserved successfully and the survival rate was 70% after thawing. Immunocytochemistry using antibody against nesting showed that some cells were immunopositive for nesting. Finally, these results suggested that cell cultures from posterior part of the Persian sturgeon brain with high proliferation capacity can be useful for research on brain cells in A. persicus in the future.
    Description: Published
    Keywords: Brain ; Cell culture ; Immunocytochemistry ; Acipenser persicus ; Persian sturgeon
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.369-380
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  • 2
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    In:  Science, London, Icelandic Meteorological Office, Ministry for the Environment University of Iceland, vol. 236, no. 4, pp. 1563-1567, pp. B02206, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Publication Date: 1987
    Keywords: Seismicity ; Earthquake precursor: prediction research ; Statistical investigations ; Fracture ; growth ; Fore-shocks
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta applicandae mathematicae 9 (1987), S. 219-237 
    ISSN: 1572-9036
    Keywords: 34A34 ; 34D99 ; 90A16 ; Nonlinear differential equations ; stability ; growth ; economic dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper analyses the implications of persistent growth upon the stability properties of dynamic models. Besides the traditional concept of asymptotic stability, new stability criteria-strong/weak absolute, strong/weak relative, strong/weak logarithmic stability-are introduced, and global stability conditions for satisfying these criteria are stated for general first-order autonomous differential equations. The conflict between rapidity of growth and the degree of stability is demonstrated. Economic applications of the stability theorems are illustrated within the growth models of Harrod and Solow.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1570-7458
    Keywords: Homoptera ; Aphididae ; Acyrthosiphon pisum ; Medicago sativa ; resistance ; amino acids ; sucrose ; phloem sap ; artificial diet ; ingestion ; growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Sur des milieux holidiques se différenciant par leur concentration en acides aminés ou en saccharose ou par leur spectre en acides aminés et copiant la sève de deux variétés de luzerne (sensible et résistante) nous avons étudié différents paramètres biologiques d'un biotype d'Acyrthosiphon pisum Harris afin de mieux comprendre les mécanismes de résistance à ce puceron. Que ce soit pour le reproduction et la survie des adultes ou pour la croissance et le développment larvaire, nous montrons l'influence spécifique de la concentration en saccharose et en acides aminés ainsi que celle du spectre en acides aminés des régimes artificiels. Ces différences de performances de A. pisum peuvent en partie être expliquées par les différences d'ingestion. Néanmoins pour des rapport saccharose/acides aminés identiques et pour des niveaux d'ingestion égaux, il existe selon les milieux de grandes différences de taux de reproduction et donc d'efficacités métaboliques. Les milieux copiant la sève de variétés sensible et résistante permettent jusqu'à présent d'expliquer une partie des observations faites sur végétal, mais démontrent que l'ignorance de certains facteurs phagostimulants présents dans la plante empêche une interprétation complète des effets observés.
    Notes: Abstract In order to understand the mechanisms of resistance of two lucerne cultivars (susceptible ‘Resistador’ and resistant ‘Lahontan’ clones) to a French biotype of Acyrthosiphon pisum Harris, several biological parameters of this aphid were investigated on sap-copied holidic diets differing either by their amino acid or sucrose concentrations or by the relative proportions of some amino acids. We recorded the quantitative influence of nutrient levels and amino acid profiles on adult survival and reproduction, as well as on larval growth and development. The differences in A. pisum performances on artificial diets may partly by explained by variable ingestion rates, but also by differences in metabolic efficiency of the ingested nutrients, which greatly depends on amino acid composition. Although holidic diet experiments partially confirm the biological assays of resistance on plants, they also point out a lack in our understanding of the factors present in the sap which are involved in phagostimulation in vivo, thus preventing a complete interpretation of observed resistance.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1570-7458
    Keywords: Syrphidae ; Metasyrphus corollae ; cereal aphid ; Sitobion avenae ; quantification ; field populations ; biomass ; voracity ; growth ; development ; kill rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Le taux de mortalité de S. avenae provoqué par les larves de M. corollae a été mesuré au laboratoire pour évaluer l'impact de ce prédateur sur les populations de ce puceron dans la nature. L'évolution du poids des larves et de la biomasse de pucerons tués a été suivie tous les jours dans des conditions de température et humidité constantes. Un taux moyen de mortalité a été déterminé pour chaque stade larvaire du prédateur, il a servi à déduire les niveaux de mortalité quotidienne dans les champs.
    Notes: Abstract The rate of kill of cereal aphids by larvae of Metasyrphus corollae (F.) (Diptera: Syrphidae) was measured in the laboratory with the aim of assessing the impact of this predator on field populations of cereal aphids. Daily measurements were taken of changes in both the larval weight and the biomass of aphids killed by M. corollae in conditions of constant temperature and humidity. A mean relative kill rate was defined and calculated for each larval instar of the predator from which estimates of field daily rates of kill can be made.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1570-7458
    Keywords: Coccinellidae ; Harmonia axyridis ; Semiadalia undecimnotata ; Aphids ; Acyrthosiphon pisum ; Pyralidae ; Anagasta kuehniella ; growth ; reproduction ; breeding ; natural prey ; unnatural prey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Aphidophagous coccinellids Harmonia axyridis and Semiadalia undecimnotata were reared on eggs of the pyralid moth, Anagasta kuehniella during three generations previously killed by exposure to ultra violet radiation. Incidentally, these eggs are used for the mass production of Trichogramma. For H. axyridis larvae, this prey has the same nutritional value as the aphid Acyrthosiphon pisum (control). In adults, it causes an increase in reproductive activity which persisted during three generations. Decreased egg fertility is compensated for by stimulated oviposition. However, regardless of generations, the number of larvae produced per female per day remained equal to or became larger than the control. When the adults are transferred to aphid prey after 15 days of oviposition on the substitution food, a high level of fecundity is maintained and egg fertility improved, particulary during the last two generations. In S. undecimnotata, a specific aphid predator, preying on substitute prey is associated with prolonged pre-imaginal development and increased mortality, the latter affecting up to 50% of the larvae during the third generation. In adults, it induces a deterioration of the reproductive capacities (fecundity, fertility) which however seemed to improve during the third generation. Substitute prey has negative effect on these adults. At present, only H. axyridis might be considered for temporary mass production, as suggested by the results obtained at the end of the first generation.
    Notes: Résumé Les coccinelles aphidiphages Harmonia axyridis Pallas et Semiadalia undecimnotata Schneider (Coccinellidae) ont été élevées pendant trois générations à l'aide d'oeufs d'Anagasta kuehniella Zell. (Pyralidae) tués par une exposition à un rayonnement ultraviolet. Chez la première espèce, cette proie de substitution présente une valuer alimentaire comparable si ce n'est pas supérieure à celle du puceron Acyrthosiphon pisum (Harris). Ces résultats permettent d'envisager, dès à présent, une production massive dans ces conditions trophiques. La mise en place d'un élevage continu dépend de l'évolution sur un grand nombre de générations de certains paramètres biologiques notamment de la fertilité des femelles. Chez la seconde espèce, une telle application paraît impossible pour l'instant.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 48 (1988), S. 225-232 
    ISSN: 1570-7458
    Keywords: Avena macrostachya ; Hordeum bogdani ; resistance ; Rhopalosiphum padi ; growth ; excretion ; amino acids ; leaf anatomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumè Lors d'examens systématiques antérieurs, Avena macrostachya (Bal. ex Coss. & Dur.) et Hordeum bogdani (Wil.) ont présenté une résistance élevée au puceron Rhopalosiphum padi (L.). Lorsqu'ils avaient un choix comprenant de l'avoine et de l'orge cultivés, les pucerons ailés ont atterri en nombres moins importants sur les espèces sauvages. Les résultats étaient cependant variables dans le complexe avoine. La production de nymphes et le poids des adultes étaient plus élevés sur espèces cultivées, ainsi que la durée du développement était plus longue sur les espèces sauvages. A partir du troisième stade, l'excrétion de miellat a été significativement plus faible sur les espèces résistantes. En général, le miellat y contenait moins de 1% d'acides aminés bien que sur H. vulgare il en contînt 3,5%. Les pourcentages d'acides aminés libres du miellat étaient semblables sur toutes les plantes (5,2–7,6%), à l'exception de H. vulgare sur lequel les pucerons excrétaient 22% des taux ingérés. Les acides aminés excrétés en fortes quantités sur les différentes plantes, comprenaient l'asparagine, l'acide γ-aminobutyrique, l'acide glutamique et la glycine. Des coupes de tissus n'ont révélé aucun obstacle mécanique clair à la pénétration des stylets. Les possibilités d'utiliser ces espèces sauvages comme source de résistance aux pucerons dans la sélection de l'avoine et de l'orge ont été examinées.
    Notes: Abstract In previous screening tests the two wild crop relatives Avena macrostachya (Bal., ex Coss. et Dur.) and Hordeum bogdani (Wil.) demonstrated a high degree of resistance to the aphid Rhopalosiphum padi (L.). In a choice situation using wild and cultivated oats and barley, alate aphids settled in lower numbers on the wild species. The results were, however, variable in the Avena combination. Nymph production was significantly higher, development time shorter and adult weight higher on the cultivated varieties. From the third instar and onwards the excretion of honeydew was significantly lower on the resistant plants. In general the honeydew contained less than 1% free amino acids although excreta from H. vulgare contained 3.5%. The percentage of free amino acids found in the honeydew was similar for all plant species (5.2–7.6%) except for H. vulgare, on which the aphids excreted 22% of the amounts ingested. Amino acids excreted in high proportions on all plants included asparagine, γ-aminobutyric acid, glutamic acid, and glycine. Tissue sectioning did not reveal any obvious mechanical barriers to stylet penetration. The potential use of these wild species as sources for aphid resistance breeding in oats and barley is considered.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 16 (1988), S. 217-226 
    ISSN: 1573-0867
    Keywords: Potassium fertilization ; grain sorghum ; savanna soil ; yield ; growth ; varietal difference ; Nigeria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field trials were conducted at Samaru over a three-year period (1980–82) to study the yield, growth and nutrient concentration of three grain sorghum varieties (L. 187, SK5912 and FFBL) in relation to potassium fertilization in a savanna soil. Potassium application rates were 0, 25, 50 and 75 kg K ha−1. Year × potassium interactions were not significant although there were significant variety × K interactions. The highest grain yields for var. L.187, SK5912 and FFBL occurred from the application of 25, 50 and 75 kg K ha−1 respectively. Straw yield was generally increased by K application, which also promoted tillering and hastened flowering in grain sorghum. Although grain weight per head, head number per m2, grain number and 1000-grain weight were unaffected by this nutrient, weight per head was reduced by 22.8 per cent. K application enhanced N concentration of sorghum plants but caused decline in P concentration. The highest K rate gave the highest K concentration in each of the three varieties at 7 weeks after planting. Optimum K requirement of grain sorghum would seem to be between 25 and 50 kg K ha−1.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 11 (1987), S. 245-266 
    ISSN: 1573-0867
    Keywords: model ; growth ; root/shoot ratio ; nutrients ; light ; winter wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The mathematical analysis presented in this paper of plant growth is based on the assumption that the influence of deficiencies in the major root nutrients of water, N, P and K is to reduce the fraction of the plant mass devoted to photosynthesis by increasing the root fraction, thereby diminishing the rate of growth of the total plant. A reciprocal phenomenon occurs with deficiency of light. Using literature data on the influence of environmental conditions on plant growth and in particular on the root/shoot ratio, the relevant rate expressions are derived in a simple form and appear to be generally similar for a wide range of plants during their vegetative phase of growth.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 11 (1987), S. 267-281 
    ISSN: 1573-0867
    Keywords: model ; growth ; root ; soil exploration ; grain fill ; winter wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the first part of this paper a model is derived for the exploration of the soil by roots in a growing crop with particular reference to cereals. The distribution of root density with depth is related to the growth of the above-ground parts and to the varying demand these place on the roots modified by the changing texture and nutrient status of the soil with depth. In the second part of the paper the growth of cereal seeds is modelled by being related to the photosynthetic capacity of the plant and the duration of its life following anthesis. The death of the plant is considered to be a consequence of the parasitic action of the seeds.
    Type of Medium: Electronic Resource
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