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Start Over Coverage 85-94

1. Compact attractor for weakly damped driven Korteweg-de Vries equations on the real line

Creator:
Laurençot, Ph.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Korteweg-de Vries equation, attractor, and unbounded domain
Language:
English
Description:
We investigate the long-time behaviour of solutions to the Korteweg-de Vries equation with a zero order dissipation and an additional forcing term, when the space variable varies over $R$, and prove that it is described by a maximal compact attractor in $H^2(R)$.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Effects of low temperature and low irradiance on the physiological characteristics and related gene expression of different pepper species

Creator:
Ou, L. J., Wei, G., Zhang, Z. Q., Dai, X. Z., and Zou, X. X.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fotosyntéza, photosynthesis, kataláza, Superoxid dismutáza, adventitious root, catalase, chlorophyll content, osmotic substances, superoxide dismutase, 2, and 581
Language:
Multiple languages
Description:
Pepper is a thermophilous and heliophilic vegetable. In China, pepper is grown in greenhouse during winter and spring under lower temperature and irradiation. In this study, we investigated the effects of low temperature and low irradiance (LTLI) on the physiological characteristics and the expression of related genes in five pepper species, Capsicum annuum L. (CA), C. baccatum L. (CB), C. chinense Jacquin (CC), C. frutescens L. (CF), and C. pubescens Ruiz & Pavon (CP) in order to screen for greenhouse species that is resistant to such adverse conditions. We observed significant reductions not only in photosynthetic pigments and stomatal conductance but also in proline, total soluble sugar, enzyme activity, and root activity; disordered arrangements of leaf palisade and spongy tissues; and first rising and then falling expression of C-repeat binding factor (CBF3) and cold-regulated genes (CORc410). These results indicate that pepper is not resistant to LTLI. We also found that CP showed significantly higher photosynthetic activity, more proline and total soluble sugar, higher enzyme activity, higher root activity, higher CBF3 and CORc410 expression levels, more tightly packed leaf palisade and spongy tissues, and thicker bundle sheath than the other four species did under LTLI, while CF exhibited the lowest values for these indicators. It demonstrated significant differences in the ability to resist to LTLI among different species, with CP showing the strongest resistance, followed by CB. Therefore, we recommend the introduction of CP and CB to greenhouse cultivation to further screen for low temperature and low light-resistant pepper varieties to increase pepper production by strengthening intervariety hybridization., L. J. Ou, G. Wei, Z.Q. Zhang, X. Z. Dai, X. X. Zou., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Geochemical distribution and mobility of heavy metals in sediments of urban streams affected by combined sewer overflows

Creator:
Hnaťuková, Petra
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
sediments, heavy metals, urban streams, sequential extraction, combined sewer overflows, sedimenty, těžké kovy, městské toky, sekvenční extrakce, and odlehčovací komory jednotné kanalizace
Language:
Slovak
Description:
This study was undertaken to assess the impact of combined sewer overflows (CSOs) on distribution and potential mobility of heavy metals in sediments of urban streams in Prague, Czech Republic. Contents of total and extractable heavy metals (Cu, Zn, Pb, Cd, Cr and Ni), mineralogical phases and other sediment properties were measured in 44 surficial sediment samples. Total metal concentrations were obtained after microwave-assisted digestion whilst extractable metal contents were obtained following a sequential extraction scheme (acid soluble, reducible, oxidisable and residual fraction). The multivariate statistics of cluster analysis was used to identify specific areas of contamination and to evaluate the impact of CSOs. The observed mobility order of metals was Cd > Zn > Ni > Cu > Pb > Cr. There was a considerable increase in Zn mobility and increase of Cu associated with the oxidisable fraction in the sediments below CSO discharges. Cd was revealed as the most mobile heavy metal with percentages of extraction of approximately 40-60% in acid soluble fraction. Pb was mainly found in reducible fraction associated with Fe/Mn (oxi)hydroxides, which is indicative of anthropogenic pollution. In terms of environmental significance, Cd and Zn can be particularly mobile and bioavailable under acidic conditions, because they are predominantly bound in labile fractions. However, potential changes of redox state and pH may remobilize the metals bound to carbonates, reducible, and/or organic matter. and Práce se zabývá vyhodnocením vlivu odlehčovacích komor jednotné kanalizace (OK) na distribuci a potenciální mobilitu těžkých kovů v sedimentech městských toků v Praze, České republice. Ve vzorcích 44 povrchových sedimentů byl stanoven obsah celkových i extrahovatelných těžkých kovů (Cu, Zn, Pb, Cd, Cr a Ni), mineralogické složení a další fyzikálně-chemické vlastnosti sedimentů. Celkový obsah kovů byl stanoven po mikrovlnném rozkladu, zatímco obsah extrahovatelných kovů byl stanoven metodou sekvenční extrakce (kyselinou extrahovatelná, redukovatelná, oxidovatelná a reziduální frakce). Pomocí mnohorozměrné shlukové analýzy byly identifikovány specifické lokality kontaminace a zhodnocen vliv OK. Zjištěná potenciální mobilita kovů klesala v pořadí Cd > Zn > Ni > Cu > Pb > Cr. V sedimentech nacházejících se na profilech pod zaústěním OK byl naměřen zvýšený obsah Zn vázajícího se na nejmobilnější frakci a zvýšený obsah Cu vázané na oxidovatelnou frakci sedimentu. Cd bylo na všech profilech shledáno nejmobilnějším kovem s vazbou na kyselinou extrahovatelnou frakci v rozmezí cca 40 až 60 %. Pb bylo vázáno převážně na redukovatelnou frakci (hydratované oxidy Fe/Mn), což indikuje antropogenní zatížení tímto kovem. Z hlediska životního prostředí představují nejvýznamnější riziko převážně Cd a Zn, které se mohou za kyselých podmínek vyskytovat v mobilních a biodostupných formách, neboť jsou nejvíce vázány na nejlabilnější složky sedimentů. Při významných změnách redoxního potenciálu a pH pak může dojít k remobilizaci kovů vázaných na karbonáty, redukovatelnou frakci i organickou hmotu.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Proměny městského účetnictví mezi 18. a 19. stoletím

Creator:
Slavíčková, Pavla
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
cities, accounting, the 18th century, the 19th century, cameral, Czech lands, města, účetnictví, 18. století, 19. století, kamerální, and české země
Language:
Czech
Description:
The aim of the article is to explain the transformation of accounting with reference to two Moravian cities, Olomouc and Uničov, between the mid-18th and 19th centuries. The article summarizes the concept of cameralism, the practical reasons for accounting reforms at the central level of the monarchy, and the beginnings of cameral accounting in the second half of the 18th century. The first legislation on the introduction of cameral accounting in municipal government dates from 1768; however, even after that year and indeed until 1922, individual cities continued to have a major influence on the specific form of accounting they used. Although sources from the end of the 18th and the first half of the 19th century are preserved only fragmentally, the main change in Olomouc and Uničov, as well as in towns in the Czech borderland studied by Petr Cais, happened around 1850, when the cities started accepting printed forms that remained in use for almost a century. In 1922, binding rules for accounting and cash desk service were published, but this had little effect on the accounting records of Olomouc and Uničov. Their journals and main accounting books maintained approximately the same form and structure regardless of this turning point. Neither did they reflect the various changes in the political system of the Czech state, up until the end of World War II. From this point of view, the cameral accounting technique designed by Enlightenment economists can be seen as a fundamental contribution to the modernization of accounting in our territory.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

6. Study of the senescence process in primary leaves of sunflower (Helianthus annuus L.) plants under two different light intensities

Creator:
De la Mata, L., Cabello, P., De la Haba, P., and Agüera, E.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
botanika, botany, antioxidant enzymes, ascorbate peroxidase, catalase, glutamate dehydrogenase, glutamine synthetase, hexose, nitrite reductase, irradiance, nitrate reductase, plant, reactive oxygen species, senescence, sunflower, superoxide dismutase, 2, and 58
Language:
Multiple languages
Description:
a1_Different parameters that vary during leaf development may be affected by light intensity. To study the influence of different light intensities on primary leaf senescence, sunflower (Helianthus annuus L.) plants were grown for 50 days under two photon flux density (PFD) conditions, namely high irradiance (HI) at 350 μmol(photon) m-2 s-1 and low irradiance (LI) at 125 μmol(photon) m-2 s-1. Plants grown under HI exhibited greater specific leaf mass referred to dry mass, leaf area and soluble protein at the beginning of the leaf development. This might have resulted from the increased CO2 fixation rate observed in HI plants, during early development of primary leaves. Chlorophyll a and b contents in HI plants were lower than in LI plants in young leaves. By contrast, the carotenoid content was significantly higher in HI plants. Glucose concentration increased with the leaf age in both treatments (HI and LI), while the starch content decreased sharply in HI plants, but only slightly in LI plants. Glucose contents were higher in HI plants than in LI plants; the differences were statistically significant (p<0.05) mainly at the beginning of the leaf senescence. On the other hand, starch contents were higher in HI plants than in LI plants, throughout the whole leaf development period. Nitrate reductase (NR) activity decreased with leaf ageing in both treatments. However, the NR activation state was higher during early leaf development and decreased more markedly in senescent leaves in plants grown under HI. GS activity also decreased during sunflower leaf ageing under both PFD conditions, but HI plants showed higher GS activities than LI plants. Aminating and deaminating activities of glutamate dehydrogenase (GDH) peaked at 50 days (senescent leaves). GDH deaminating activity increased 5-fold during the leaf development in HI plants, but only 2-fold in LI plants., a2_ The plants grown under HI exhibited considerable oxidative stress in vivo during the leaf senescence, as revealed by the substantial H2O2 accumulation and the sharply decrease in the antioxidant enzymes, catalase and ascorbate peroxidase, in comparison with LI plants. Probably, systemic signals triggered by a high PFD caused early senescence and diminished oxidative protection in primary leaves of sunflower plants as a result., L. De la Mata ... [et al.]., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

7. The triadjoint of an orthosymmetric bimorphism

Creator:
Toumi, Mohamed Ali
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
math and almost $f$-algebra orthosymmetric bimorphism
Language:
English
Description:
Let $A$ and $B$ be two Archimedean vector lattices and let $( A^{\prime }) _n'$ and $( B') _n'$ be their order continuous order biduals. If $\Psi \colon A\times A\rightarrow B$ is a positive orthosymmetric bimorphism, then the triadjoint $\Psi ^{\ast \ast \ast }\colon ( A') _n'\times ( A') _n'\rightarrow ( B') _n'$ of $\Psi $ is inevitably orthosymmetric. This leads to a new and short proof of the commutativity of almost $f$-algebras.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public