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1283. Acanthochondria serrani sp. n. (Copepoda: Chondracanthidae) parasitic on Serranus auriga (Perciformes: Serranidae) from Argentinean waters

Creator:
Braicovich, Paola E. and Timi, Juan T.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
parasitic copepods, marine fish, systematics, and Argentina
Language:
English
Description:
A new species of Acanthochondria Oakley, 1927 (Copepoda, Poecilostomatoida, Chondracanthidae), parasitic on Serranus auriga (Cuvier) from the Argentinean coastal zone, is described and illustrated. The new species differs from its congeners by the relative length of the neck and the protopod of leg 2. This is the second record of this genus for the South-eastern Atlantic and the first one from a serranid host.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1284. Acanthocolpidae (Digenea) of marine fishes off New Caledonia, with the descriptions of two new species

Creator:
Bray, Rodney A. and Justine, Jean-Lou
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Digenea, Acanthocolpidae, Acaenodera, Pleorchis, Stephanostomum, and New Caledonia
Language:
English
Description:
The following acanthocolpid species are reported from New Caledonia. Acaenodera nautili sp. n. from Conger cinereus Rüppel differs from other Acaenodera species in details of the body-spination, the sucker-ratio and the bipartite seminal vesicle; Stephanostomum murielae sp. n. from Carangoides hedlandensis (Whitley) differs from most species of Stephanostomum in the average of 36 circum-oral spines, the circum-oral spine rows with a ventral hiatus and the anterior extent of the vitellarium being >10% of the hindbody length from ventral sucker. The species is distinguished from the three other species with these characters in a detailed review. The other species reported are: Stephanostomum aaravi Bray et Cribb, 2003 from Lethrinus miniatus and L. rubrioperculatus; Stephanostomum ditrematis (Yamaguti, 1939) from Gnathanodon speciosus; Stephanostomum japonocasum Durio et Manter, 1969 from Cephalopholis urodeta, Epinephelus areolatus, E. chlorostigma, E. maculatus, E. retouti, Lethrinus miniatus and Variola louti; Stephanostomum uku Yamaguti, 1970 and Pleorchis uku Yamaguti, 1970 from Aprion virescens.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1285. Accelerometric measurements of the nongravitational forces on the CESAR satellite

Creator:
Peřestý, R. and Sehnal, L.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
artificial satellite, non-gravitational forces, and accelerometric measurements
Language:
Czech
Description:
Knowledge of the forces affecting mostly the description of the artificial satellites motion is very important task at present. This is valid especially for the forces of the non-gravitational origin. Their description is done at best via the in-situ measurements of their dynamlcs manifestations, i.e., to use the high-sensitive microaccelerometers. We already built and proved one such a device consisting of a cubic proof-mass free-flowing within an external cubic cavity. Our accelerometer has been succesfully tested on the RESOURCE F-1 satellite on June 1992. A project of another experiment is now being prepared under the náme of ”CESAR” with a participation of five central-European countries. The launch of the proposed satellite is envisaged for 1997.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

1287. Accessibility number and the neighbour-integrity of generalised petersen graphs

Creator:
Dündar, Pinar
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
graph theory, network connectivity, network stability, and communication network
Language:
English
Description:
When the nodes or links of communication networks are destroyed, its effectiveness decreases. Thus, we must design the communication network as stable as possible, not only with respect to the initial disruption, but also with respect to the possible reconstruction of the network. A graph is considered as a modeling network, many graph theoretic parameters have been ušed to describe the stability of communication networks, including connectivity, integrity, tenacity. Several of these deal with two fundamental questions about the resulting graph. How many vertices can still communicate? How difficult is it to reconnect the graph? Stability numbers of a graph measure its durability respect to break down. The neighbour-integrity of a graph is a measure of graph vulnerability. In the neighbour-integrity, it is considered that any failure vertex effects its neighbour vertices. In this work, we define the accessible sets and accessibility number and we consider the neighbour-integrity of Generalised Petersen graphs and the relation with its accessibility number.
Rights:
http://creativecommons.org/publicdomain/mark/1.0/ and policy:public

1288. Acclimation and photoprotection of young gametophytes of Acrostichum danaeifolium to UV-B stress

Creator:
Randi, A. M., Freitas, M. C. A., Rodrigues, A. C., Maraschin, M., and Torres, M. A.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
fotosyntéza, karotenoidy, chlorofyl, photosynthesis, carotenoids, chlorophyll, gametophyte development, phenolic compounds, ultrastructure, ultraviolet-B radiation, Acrostichum danaeifolium, 2, and 581
Language:
Multiple languages
Description:
The effect of ultraviolet B radiation (UV-B) on cellular ultrastructure, chlorophyll (Chl), carotenoids, and total phenolics of Acrostichum danaeifolium gametophytes was analyzed. The control group of spores was germinated under standard conditions, while the test group of spores was germinated with additional UV-B for 30 min every day for 34 d. The cell characteristics were preserved in gametophytes irradiated with UV-B, but the number of starch grains increased in the chloroplasts and the more developed grana organization in contrast to the chloroplasts of the control group. Chl a content decreased, while Chl b content increased in the gametophytes cultivated with UV-B for 34 d. Contents of lutein and zeaxanthin decreased and trans-β-carotene concentration was enhanced in the gametophytes irradiated with UV-B. The content of total phenolic compounds increased in the gametophytes cultivated with UV-B. Therefore our data suggest that the gametophytes of A. danaeifolium, a fern endemic to the mangrove biome, were sensitive to enhancement of UV-B radiation at the beginning of their development and they exhibited alterations in their ultrastructure, pigment contents, and protective mechanisms of the photosynthetic apparatus, when exposed to this radiation., A. M. Randi, M. C. A. Freitas, A. C. Rodrigues, M. Maraschin, M. A. Torres., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1289. Acclimation of photosynthesis in a boreal grass (Phalaris arundinacea L.) under different temperature, CO2, and soil water regimes

Creator:
Ge, Z.-M., Zhou, X., Kellomäki, S., Zhang, C., Peltola, H., Martikainen, P. J., and Wang, K. Y.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
botanika, botany, acclimation of photosynthesis, carbon dioxide, carboxylation efficiency, electron transport, temperature, water deficit, 2, and 58
Language:
Multiple languages
Description:
a1_The aim of this work was to study the acclimation of photosynthesis in a boreal grass (Phalaris arundinacea L.) grown in controlled environment chambers under elevated temperature (ambient + 3.5°C) and CO2 (700 μmol mol-1) with varying soil water regimes. More specifically, we studied, during two development stages (early: heading; late: florescence completed), how the temperature response of light-saturated net photosynthetic rate (Psat), maximum rate of ribulose-1,5-bisphosphate carboxylase/oxygenase activity (Vcmax) and potential rate of electron transport (Jmax) acclimatized to the changed environment. During the early growing period, we found a greater temperature-induced enhancement of Psat at higher measurement temperatures, which disappeared during the late stage. Under elevated growth temperature, Vcmax and Jmax at lower measurement temperatures (5-15°C) were lower than those under ambient growth temperature during the early period. When the measurements were done at 20-30°C, the situation was the opposite. During the late growing period, Vcmax and Jmax under elevated growth temperature were consistently lower across measurement temperatures. CO2 enrichment significantly increased Psat with higher intercellular CO2 compared to ambient CO2 treatment, however, elevated CO2 slightly decreased Vcmax and Jmax across measurement temperatures, probably due to down-regulation acclimation. For two growing periods, soil water availability affected the variation in photosynthesis and biochemical parameters much more than climatic treatment did. Over two growing periods, Vcmax and Jmax were on average 36.4 and 30.6%, respectively, lower with low water availability compared to high water availability across measurement temperatures. During the late growing period, elevated growth temperature further reduced the photosynthesis under low water availability., a2_Vcmax and Jmax declined along with the decrease in nitrogen content of leaves as growing period progressed, regardless of climatic treatment and water regime. We suggest that, for grass species, seasonal acclimation of the photosynthetic parameters under varying environmental conditions needed to be identified to fairly estimate the whole-life photosynthesis., Z.-M. Ge ... [et al.]., Obsahuje poznámky, and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

1290. Acclimation of photosynthesis to temperature in Arabidopsis thaliana and Brassica oleracea

Creator:
Bunce, J. A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
chlorophyll fluorescence, mesophyll conductance to CO2, photosynthetic electron transport, species differences, and triose phosphate utilization ratio
Language:
Multiple languages
Description:
Plants differ in how much the response of net photosynthetic rate (PN) to temperature (T) changes with the T during leaf development, and also in the biochemical basis of such changes in response. The amount of photosynthetic acclimation to T and the components of the photosynthetic system involved were compared in Arabidopsis thaliana and Brassica oleracea to determine how well A. thaliana might serve as a model organism to study the process of photosynthetic acclimation to T. Responses of single-leaf gas exchange and chlorophyll fluorescence to CO2 concentration measured over the range of 10-35 °C for both species grown at 15, 21, and 27 °C were used to determine the T dependencies of maximum rates of carboxylation (VCmax), photosynthetic electron transport (Jmax), triose phosphate utilization rate (TPU), and mesophyll conductance to carbon dioxide (g'm). In A. thaliana, the optimum T of PN at air concentrations of CO2 was unaffected by this range of growth T, and the T dependencies of VCmax, Jmax, and g'm were also unaffected by growth T. There was no evidence of TPU limitation of PN in this species over the range of measurement conditions. In contrast, the optimum T of PN increased with growth T in B. oleracea, and the T dependencies of VCmax, Jmax, and g'm, as well as the T at which TPU limited PN all varied significantly with growth T. Thus B. oleracea had much a larger capacity to acclimate photosynthetically to moderate T than did A. thaliana.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

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