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Start Over Coverage 29-39

1. Asymptotic properties of solutions of higher order difference equations

Creator:
Migda, Janusz
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
difference equation and asymptotic behavior
Language:
English
Description:
Asymptotic properties of solutions of the difference equation of the form ∆ mxn = anϕ(xτ1(n) , . . . , xτk(n) ) + bn are studied. Conditions under which every (every bounded) solution of the equation ∆myn = bn is asymptotically equivalent to some solution of the above equation are obtained.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Chlorophyll fluorescence parameters characterizing the development of two cacao genotypes infected by witches' broom

Creator:
Santos, I. C. F., de Almeida, A.-A. F., and Valle, R. R.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Crinipellis perniciosa, genotypes, hybrids, leaf development, pathogens, photosystems 1 and 2, quantum yield, and Theobroma cacao
Language:
Multiple languages
Description:
Greenhouse-grown susceptible 20-d-old seedlings of Theobroma cacao genotypes Catongo and tolerant genotype SCA6xCatongo were inoculated with a mixture of isolates of Crinipellis perniciosa, the causal agent of witches' broom. The characteristics of chlorophyll a fluorescence emission were monitored during leaf ontogeny using a portable system PAM-2000. In both inoculated and non-inoculated genotypes, significant differences were found for the effective quantum yield values of photosystem (PS) 2 (ΔF/Fm') at the B (7 to 14-d-old), D (21 to 30-d-old), and E (>30-d-old) stages of leaf development, and in quantum yield of the non-cyclic photosynthetic electron transport between PS2 and PS1 [qp(Fv/Fm)] and quencher efficiency [(Fm-Ft)/F0] at the B, C (15 to 20-d-old) and D stages. Intergenotypic differences were found only for the [qp(Fv/Fm)] and [(Fm-Ft)/F0] values at the E stage, and for fluorescence quenching (Fm-Ft) at the B and E stages. Highly significant inter- and intragenotype relationships were found between the rate of photosynthetic electron transport to PS2 (Amax) and maximum fluorescence during actinic irradiation (Fm'). Also, each of the highly significant relationships between (Fm-Ft) and Amax, [(Fm-Ft)/F0] and ΔF/Fm', and between [(Fm-Ft)/F0] and Amax were represented by a general model, independent of treatments. Therefore, alterations in energy distribution in the radiant energy collector complex interior of PS2 and reduction in absorption of photosynthetically active radiation were observed in the infected plants, mainly in the hybrid at the C stage. Also, variations were found in the noncyclic photosynthetic electron transport at the B and C stages in the infected Catongo. and I. C. F. Santos, A.-A. F. de Almeida, R. R. Valle.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Notes to optimization of solar engine

Creator:
Stojan, Petr
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
endoreversible thermodynamics, heat engine, solar collector, solar energy, and optimization
Language:
English
Description:
Solar engine is discussed as integration of solar collector with linear heat loss and Curzon-Ahlborn engine is considered. This simple endoreversible model is used to discuss some applications of results of endoreversible heat engine in the field of solar engine. Optimum operating temperature of the solar collector and relevant maximum overall efficiency of solar engine is calculated, the results being compared with those by the models where Carnot and Curzon-Ahlborn efficiences were used. Conclusions obtained for endoreversible model are used for simple optimal design of solar engine. The size of heat engine for a given solar collector is optimized. The investment costs of solar collector and heat engine per unit of output power are used as optimization criterion. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Review of Myxosporea of importance in salmonid fisheries and aquaculture in British Columbia

Creator:
Kent, M.L., Margolis, L., Whitaker, D.J., Hoskins, G.E., and McDonald, T.E.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Myxosporea, salmonids, fisheries, and fish pathology
Language:
English
Description:
everal myxosporean parasites are of importance in fisheries and aquaculture in British Columbia. The PKX organism and Ceratomyxa shasta Noble, 1950 cause disease and mortality, Kudoa thyrsiles (Gilchrist, 1924) and Henneguya salminicola Ward, 1919 are of importance because they infect somatic muscle, cause unsightly cysts and soft flesh, and thus reduce the market value of the fish. Myxobolus arcticus Pugachev et Khokhlov, 1979, an apparently non-pathogenic species, along with H. salminicola, is used as a biological tag in fishery management. Myxobolus arcticus has also been used in our laboratory as a model for the study of myxosporean life cycles. Other myxosporeans that have been found in salmonids in British Columbia include Myxobolus squamalis (Iverson, 1954), Myxobolus insidiosus Wyatt et Pratt, 1963, Myxidium truitae Léger, 1930, Myxidium salvelini Shuhnan et Konovalov, 1966, Chloromyxum sp., ľarvicapsula sp., and Sphaerospora sp.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public