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71.
A simple and accurate flow-through system was developed for toxicity evaluation of biodegradable substances, wastewaters, and surface waters. The chronic toxicity of phenol to the daphnid Daphnia magna was studied during a 21 d exposure period, first using a semi-static and later a flow-through test. The flow- through system was advantageous especially when lower concentrations of phenol were examined. Its use provided a constant concentration of phenol in all tested samples. Exposure to phenol showed a similar influence on both survival and reproduction of daphnids; the IC25 value was 3.18 mg L-1. 相似文献
72.
Fangbing Liu Elena Sukhacheva Tatjana Erokhina Jörg Schubert 《European journal of plant pathology / European Foundation for Plant Pathology》1999,105(4):389-395
Potyviral nuclear inclusion b protein (NIb), the RNA-dependent RNA polymerase, contains three highly conserved regions. Peptides corresponding to these regions were synthesised and used for immunisation. A panel of monoclonal antibodies was obtained. Most of the MAbs reacted with the peptides and a recombinant NIb of PVY in PTA-ELISA. Two of them specifically detected native NIb of potato A, potato V, potato Y, plum pox and turnip mosaic potyviruses in extracts of infected plants in Western blots. Time course experiments revealed that NIb protein can be first detected on the fifth day after infection. 相似文献
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Nitrogen efficiency of canola genotypes varies between vegetative stage and grain maturity 总被引:2,自引:0,他引:2
There is no information on whether N efficiency in canola at maturity can be reliably determined by screening germplasm in
the vegetative stage. Twelve canola genotypes identified in preliminary screening study as having either high or low N efficiency
indices were tested for consistency in N efficiency between the vegetative stage and maturity. Plants were grown in a glasshouse
under low or adequate N supply and N efficiency was assessed using the following criteria: dry weight at deficient N supply,
relative yield at low vs. adequate N supply, and N utilisation efficiency. None of the 12 tested genotypes was classified
as efficient or inefficient under all three criteria. One genotype (46C74) was classified as efficient under two criteria,
and one genotype (Surpass 300 TT) was inefficient under two criteria. At maturity, three additional efficiency criteria were
used: harvest index, N harvest index, and oil and protein concentration in seed. Two genotypes (Wesway and 46C74) (ranked
as efficient at vegetative stage) remained efficient at maturity under most of the efficiency criteria used. On the other
hand, genotype Surpass 603 CL ranked inefficient during the vegetative stage was ranked as efficient at maturity under two
criteria. Overall, there was little consistency in the N efficiency ranking between vegetative stage and maturity in 12 tested
genotypes. Screening canola germplasm for N efficiency for breeding purposes would therefore require an assessment at maturity. 相似文献
75.
Bakary Traoré Loïc Brancheriau Patrick Perré Tatjana Stevanovic Papa Diouf 《Annals of Forest Science》2010,67(8):815-815
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• Vène wood (Pterocarpus erinaceus Poir.) is currently the favorite wood for manufacture of xylophone in Mali. A dynamic analysis method with free boundary
conditions, known as BING, was used to determine the main acoustic properties: specific dynamic modulus (E
L
/ρ), damping coefficient or internal friction (tan δ), sound radiation coefficient (SRC) and peak response (PR). 相似文献
76.
The understanding of the interactive effect of water and N availability, associated with the ability of crops to efficiently use these resources, is a crucial issue for stabilizing cereal production in Mediterranean areas. A 3-year side by side experiment on durum wheat and barley, under different water regimes and nitrogen levels, was carried out in a typical Mediterranean environment of Southern Italy, to identify the outstanding features of these species that contribute to enhanced grain yield and improved water and nitrogen use efficiency. 相似文献
77.
Tatjana Topalovic Vincent A. Nierstrasz Marijn M. C. G. Warmoeskerken 《Fibers and Polymers》2010,11(1):72-78
We have developed a homogeneous model system to study the mechanism of hydrogen peroxide bleaching using [Mn2O3(N,N′,N″-trimethyl-1,4,7-triazacyclononane)2](PF6)2 (MnTMTACN) as catalyst. The primary model pigment examined is morin (3,5,7,2′,4′-pentahydroxyflavone) owing to its presence
in native cotton fiber. Additionally, a series of model compounds with systematic structural differences are examined in order
to facilitate the development of a mechanistic understanding of the bleaching system. The pigment oxidative degradation reaction
is monitored by UV-Vis spectrophotometry. The influence of pH is examined in both homogeneous and heterogeneous model systems.
The use of MnTMTACN catalyst enables low-temperature hydrogen peroxide bleaching of cotton fabric at slightly lower pH values. 相似文献
78.
Canine babesiosis, caused by intraerythrocytic Babesia spp., is a tick-borne disease of worldwide importance. No information on canine babesiosis has been documented in Slovenia. Therefore, 238 dogs admitted to the Small animal clinic in Ljubljana from the years 2000 to 2002 were tested for the presence of babesial parasites in the blood. Based on clinical, microscopic and molecular investigations, 14 dogs (5.9%) were determined as being infected with babesiae. Clinical signs relating to acute haemolysis, fever, anorexia, depression and haematological abnormalities such as anaemia and thrombocytopenia were noticed in most of the 14 infected dogs. The morphology of the parasites was indicative of Babesia canis infection. Two subspecies were detected, namely B. canis canis (11 dogs, 4.6%) and B. canis vogeli (3 dogs, 1.3%) using PCR and subsequent sequence analysis of portions of nns rRNA gene. In addition, based on nucleotide sequence analysis, the 11 isolates of B. c. canis could be subdivided into three groups, whereas the three B. c. vogeli isolates were genetically identical. The results of this study demonstrate the presence of canine babesiosis due to B. c. canis and B. c. vogeli in Slovenia. 相似文献
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