Iron oxygenases mimicking active sites have been constructed on the solid support by anchoring a bis(imidazolyl)borate ligand to carboxylate-functionalized SBA-15 type mesoporous silica gels. Initial loading amounts of an organocarboxylic acid modifier on the silicates affect the hydrocarbon oxygenation catalyses with H2O2 due to changing of the structures of the surface metallocomplex active sites.
Gibberellins are not essential for photoperiodic flower induction of PAarin'fenii. -Physiol. Plant. 97: 397-401.The influence on photoperiodic flowering of (2-cbloroethyl)trimethylammDniam chloride (CCC), an inhibitor of gibberellin (OA) biosynthesis, was studied in the short-day plant Pharbitis nil cv. Violet. The cotyledons contained high levels of endogenous bioactive gibberellins, whereas in the plumules and first leaves the levels were low or undetectable. The first leaf responded to a single dark treatment by inducing flowering when it was 10 mm or wider. Similar seedlings, but without cotyledons, were used as the assay plants to study the effect of CCC on photoperiodic flowering. Treatment with CCC had no effect on flowering of seedlings without cotyledons, althotigh stem elongation was inhibited. By contrast. CCC inhibited flowering of the intact seedlings with cotyledons. Gibberellic acid applied to the shoot apex or to the first leaf promoted flowering in the CCC-treated seedlings without cotyledons. The results indicate that gibberellins are not essential for the flower induction process in leaves, but that they promote flower initiation and/or later processes in the shoot apices.
A one-dimensional pyroelectric array detector as a multi-element infrared sensor has been developed by using a new sheet forming method made of PbTiO3 bulk ceramics. This simple fabrication process is cost effective and enables us to control the film thickness accurately, thus decreasing the sensitivity variations that exist in one detector and among different detectors to within 10%. A pyroelectric detector responsivity of 2×104 V/W can be obtained at 10 Hz chopping frequency. A specific detectivity D
* of 0.8×108 cm· Hz1/2/W has been achieved. Furthermore, this detector has a sufficient sensitivity for performances at high chopping speeds up to 100 Hz. The time constant of this pyroelectric detector is about 8.6 ms, so the detector has a shorter response time compared with the commercially available conventional pyroelectric detector. The cross talk, which influences the output for the adjacent elements, is less than 10%. By using this high performance pyroelectric array detector, the thermal sources at lower temperatures than environmental conditions can be detected with high sensitivity, as much as the thermal sources at higher temperatures. The output voltage for the detector was gradually decreased as the atmospheric temperature increased.
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