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71.
I. G. Shirokikh S. Yu. Ogorodnikova I. V. Dalke O. N. Shupletsova 《Biology Bulletin》2011,38(6):602-607
Callus lines of barley (Hordeum vulgare L.) resistant to aluminum toxicity and osmotic stress from which plants regenerated were obtained in selective systems. Comparative
estimation of the intensity of lipid peroxidation, the content of anthocyans and ascorbic acid in leaves, the parameters of
CO2/H2O gas exchange in leaves of regenerant plants obtained in selective mediums with gradual addition of aluminum ions and polyethylene
glycol and in mediums without selective agents was performed in conditions of an artificial climate. The obtained data were
compared with biochemical and physiological parameters of barley plants of the initial genotypes grown in the same conditions.
Significant changes in the intensity of apparent photosynthesis, transpiration, and efficacy of water use by barley leaves
were revealed as a result of callus culturing and especially due to the use of selective systems in vitro. 相似文献
72.
Voskamp KE; Noorman N; Mastebroek HA; Van Schoot NE; Den Otter CJ 《Chemical senses》1998,23(5):521-530
Spike trains from individual antennal olfactory cells of tsetse flies
(Glossina spp.) obtained during steady-state conditions (spontaneous as
well as during stimulation with 1-octen-3-ol) and dynamic stimulation with
repetitive pulses of 1-octen-3-ol were investigated by studying the spike
frequency and the temporal structure of the trains. In general, stimulation
changes the intensity of the spike activity but leaves the underlying
stochastic structure unaffected. This structure turns out to be a renewal
process. The only independently varying parameter in this process is the
mean interspike interval length, suggesting that olfactory cells of tsetse
flies may transmit information via a frequency coding. In spike records
with high firing rates, however, the stationary records had significant
negative first- order serial correlation coefficients and were non-renewal.
Some cells in this study were capable of precisely encoding the onset of
the odour pulses at frequencies up to at least 3 Hz. Cells with a rapid
return to pre-stimulus activity at the end of stimulation responded more
adequately to pulsed stimuli than cells with a long increased spike
frequency. While short-firing cells process information via a frequency
code, long-firing cells responded with two distinctive phases: a phasic,
non-renewal response and a tonic, renewal response which may function as a
memory of previous stimulations.
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73.
The survival of environmental isolates of actinomycetes introduced with the seeds of agricultural plants in root-free soil and in the rhizosphere and rhizoplane was studied. Different strategies of colonization of the rhizosphere were revealed for the representatives of the genera Streptomyces, Micromonospora, and Streptosporangium, organisms typical for the moderate climate rhizosphere. The plants of winter rye (Secale cereale L.) inoculated with actinomycetes were shown to have growth advantages, while the cow clover plants (Trifolium pratense L.) had no growth advantages compared to uninoculated plants. The role of the plant component in the interaction with mycelial prokaryotes is discussed. 相似文献
74.
The effect of cyanobacteria (Nostoc linckia, N. commune, and Microchaeta tenera) and streptomycetes on the pathogenic micromycete Fusarium was studied in laboratory simulation experiments. Interpopulational relationships in the rhizosphere of spring wheat (Triticum aestivum L.) and in soddy-podzolic soil were investigated. 相似文献