Search

Start Over Coverage 51-57

1. $M$-ideals of compact operators into $\ell_p$

Creator:
John, Kamil and Werner, Dirk
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
math, $M$-ideals, and 1-unconditional finite-dimensional Schauder decomposition
Language:
English
Description:
We show for $2\le p<\infty $ and subspaces $X$ of quotients of $L_{p}$ with a $1$-unconditional finite-dimensional Schauder decomposition that $K(X,\ell _{p})$ is an $M$-ideal in $L(X,\ell _{p})$.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

2. Elementy současné vědy v úlohách fyzikální olympiády

Creator:
Volf, Ivo and Vybíral, Bohumil
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
fyzikální věda, středoškolská výuka, mezinárodní fyzikální olympiády, physical science, high school education, and international physics olympiads
Language:
Czech
Description:
V článku se zabýváme problémy spojenými s uplatňováním elementů současné fyzikální vědy v úlohách. U teoretických úloh jde především o skutečnost, že středoškolští řešitelé mnohdy neznají potřebné fyzikální i matematické vztahy a ty se musí v zadání uvést. U experimentálních úloh jsou organizátoři omezení velkým počtem aparatur, které musí postavit. Proto se uplatňují úlohy, kdy si řešitel musí umět poradit s omezenými prostředky. Ve druhé části příspěvku je na devatenácti příkladech uvedeno, jak se daří organizátorům uplatňovat současnou vědu v úlohách mezinárodních fyzikálních olympiád., Ivo Volf, Bohumil Vybíral., and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

3. Increased stability of thylakoid components in Vigna sinensis L. seedlings grown under ultraviolet-B enhanced radiation

Creator:
Nedunchezhian, N. and Kulandaivelu, G.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Chloroplasts isolated from Vigna sinensis L, seedlings grown under cool íluorescent (control chloroplasts) and ultraviolet-B (UV-B)-enhanced íluorescent (UV chloroplasts) radiation, when incubated at 10, 20, 30 and 40 °C, showed large variations in the photosynthetic electron transport reactions. The overall electron transport activity in both control and UV chloroplasts incubated at 40 decreased rapidly. In contrast to this, at 30 the control chloroplasts got inactivated very rapidly during the 30 min of incubation while the UV chloroplasts showed high stability. A similar trend was also noticed at 20 “C. At 10 °C, although the rate of inactivation was slow, UV chloroplasts were more stable than control chloroplasts. A similar trend was noticed in photosystern (PS) 2 activity. In contrast to overall electron transport and PS2 reactions, PS 1 activity showed only marginal changes at all temperatures. The polypeptide profiles of chloroplasts exposed to UV-B iixadiation for 60 min at different temperatures revealed marked decreases in the level of the 23 and 33 kDa polypeptides in control chloroplasts while in UV chloroplasts these polypeptides were highly stable. In addition, UV chloroplasts contained several new polypeptides of both high and low molecular masses. The polypeptide partem indicated that higher photochemical activity of UV chloroplasts over the control chloroplasts could be due to stabilization of PS 2 core complexes by the new polypeptides induced under UV-B enhanced radiation.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Observations on cucullanid nematodes from freshwater fishes in Mexico, including Dichelyne mexicanus sp. n.

Creator:
Caspeta-Mandujano, Juan Manuel, Moravec, František, and Salgado-Maldonado, Guillermo
Format:
print
Type:
model:internalpart and TEXT
Subject:
Nematoda, Cucullanus, Dichelyne, freshwater fish, Ictalurus, Gohiomorus, Agonostomus, Cichlasoma, and Mexico
Language:
English
Description:
A new cucullanid nematode, Dichelyne mexicanus sp. n., is described from the intestine of three species of fishes, Agonostomus monticola (Bancroft) (Mugilidae, Perciformcs) (type host), Ictalurus balsanus (Jordan et Snyder) (Ictaluridac, Siluriformes) and Cichlasoma beani (Jordan) (Cichlidae, Perciformes), from three rivers (la Maquina River, Veracruz; Chontalcoatlán River, Guerrero and Santiago River, Nayaril) in central Mexico. This species is characterised by the absence of a ventral sucker in the male (subgenus Dichelyne) and it differs from its congeners mainly in possessing very unequal and dissimilar spicules (left 0.465-0.768 mm and right 293-548 mm long), an asymmetrical gubernaculum, and two intestinal caeca. Another cucullanid nematode, Cucullanus cabaUeroi Petter, 1977, is reported from Dormitator maculalus (Bloch) (Eleotridae, Perciformes) from the La Palma and La Maquina Rivers and Balzapote stream, Veracruz, being briefly described and illustrated; this represents a new host record. Findings of D. mexicanus and C. cabalteroi represent a new record of cucullanid nematodes from fishes in Mexican fresh waters.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Radiation and carbon use efficiency of field grown jute (Corchorus spp.) ín relation to potential prímary production

Creator:
Palit, P.
Format:
print
Type:
model:internalpart and TEXT
Language:
Multiple languages
Description:
Potential daily biomass production of jutě was calculated from the conversion of measured incident photosynthetic photon flux (PPF) during the jutě growing season (Apríl - August) of Indo-Bangladesh sub-continent and evaluating the average respirátory loss over the same period. Taking an average incident PPF of 39.87 mol(photon) m-2 d’*, the potential daily rate of dry matter production of 49.77 g m'2 was estimated with a photosynthetic efficiency of 1.25 g mol'^ Considering the daily production rate as proportional to the amount of radiant energy interception by the crop at different stages of growth, a maximum jutě biomass production capacity of 4.081 kg m'2 (40.81 t ha'*) was estimated. This value was little more than two times the average production obtained from the field experiment under similar conditions. Radiation use efficiency of a dosed jutě canopy (3.5 g MJ**), however, appears to háve reached that for any field crop.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

6. Soybean stomatal aclimation to long-term exposure to CO2-enriched atmospheres

Creator:
Chen, X.M., Begonia, G.B., and Hesketh, J.D.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Glycine max (L.), transpiration rate, stomatal conductance, open top chamber, and net photosynthetic rate
Language:
Multiple languages
Description:
Soybean [Glycine max (L.) cv. Jack] grown in open top chambers under controlled laboratory and field conditions was ušed to study the acclimation of leaf gas exchange processes to CO2 enrichment. Air inside the open top chambers was maintained at either 700-800 or 350-400 pmol(C02) mol'^(air). Leaf gas exchange rates were measured for some plants switched between treatments. When measmed in the C02-emiched atmosphere, stomatal conductances (gg) were higher in leaves grown in C02-enriched atmospheres than in those grown under ambient conditions, and the lower gg values for plants in the C02-enriched atmospheres were limiting to leaf net photosynthetic CO2 exchange rates (Pn). of enriched leaves was higher than those of the ambient Controls when measured at elevated CO2 levels in both controlled environment and field studies, while it was depressed in enriched leaves when measured imder ambient CO2 conditions, and this drop in Pn did not recover until 6-15 d after plants were placed back in ambient conditions.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public