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Summary To describe the relationship between nematode density and yield, four equations of increasing complexity are found in the
literature. They concern a linear regression curve, a log linear regression curve, a regression curve based on an exponential
relation and an inverse linear regression curve. The yield to PCN density responses of these equations are shown on a linear
and on a logarithmic scale. Considerable differences are shown in the way they respond to the same data. None of these equations
is able to explain or forecast yield decrease caused by potato cyst nematodes. 相似文献
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In our previous research, the possibility of using chitosan in preparing the pretreatment print paste for digital ink-jet
printing for cotton fabric was investigated but the final color was not good as expected. In this paper, we modified our previous
work by applying the chitsoan separately on the cotton fabric for digital ink-jet printing. A two-bath method was thus proposed
and it was confirmed that a better color yield was achieved with this method. However, the use of chitosan reduced the tensile
strength of the digital ink-jet printed fabric slightly. 相似文献
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La purification d'un extrait mycélien soluble d'une souche deR. solani AG3 par chromatographie d'exclusion permet de recueillir une fraction antigénique. Une lapine est immunisée par voie intradermique.
L'immunsérum titre 0,125 par la technique de double-diffusion en agarose. Différentes techniques sérologiques (immunodiffusion,
électrotransfert suivi de révélation des fractions antigéniques, coloration immunoenzymatique du mycélium) sont appliquées
à des souches deR. solani AG1, AG2, AG3, AG4, AG5, AG6, AG7, AGBI et deCeratobasidium CAG1, CAG2, CAG3, CAG4 et CAG5. Le sérum se révèle spécifique des souches AG3.
A soluble mycelial extract ofR. solani AG3 was purified by size exclusion chromatography. Five peaks were present in the elution profile: the first was well defined
and of large volume. It was retained to immunise a female rabbit by intradermic injection. The titre of the antiserum determined
by double immuno-diffusion in agarose was 0.125. The antiserum was tested on isolates ofR. solani AG1, AG2, AG3, AG4, AG5, AG6, AG7, AGB1 and ofCeratobasidium CAG1, CAG2, CAG3, CAG4 and CAG5 (Table 1) using three different methods:
相似文献
| – | - immunodiffusion with the test material adjusted to 3 mg/ml of proteins. Only AG3 isolates formed a single precipitation line (Fig. 1). |
| – | - electrotransfer and immuno-blotting. Test samples containing 8 mg/ml of proteins were electrophoresed under natural conditions in a discontinuous system. The proteins were then electrotransferred to a nitrocellulose membrane. Immunoenzymatic staining showed that only one band was present in AG3 isolates (Fig. 2). |
| – | - immunoenzymatic labelling of the mycelium demonstrated the presence of dark granules on the cell wall of only AG3 isolates (Fig. 3). |