Lacl3
Mostrando 13-24 de 37 artigos, teses e dissertações.
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13. Suppression of experimental atherosclerosis by the Ca++-antagonist lanthanum. Possible role of calcium in atherogenesis.
Agents inhibiting calcium deposition into arteries are known to suppress atherosclerosis in animals. However, the precise role of calcium in atherogenesis is unknown. In this study, the specific Ca2+-antagonist lanthanum was used to attempt suppression of experimental atherosclerosis and to gain more insight into the possible effects of calcium on atherogene
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14. Al Inhibits Both Shoot Development and Root Growth in als3, an Al-Sensitive Arabidopsis Mutant.
In als3, an Al-sensitive Arabidopsis mutant, shoot development and root growth are sensitive to Al. Mutant als3 seedlings grown in an Al-containing medium exhibit severely inhibited leaf expansion and root growth. In the presence of Al, unexpanded leaves accumulate callose, an indicator of Al damage in roots. The possibility that the inhibition of shoot deve
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15. Ca(II)-calmodulin regulation of fungal dimorphism in Ceratocystis ulmi.
We have shown that Ca(II) ions, ethylene glycol-bis(beta-aminoethyl ether)-N,N-tetraacetic acid, LaCl3, and six known calmodulin inhibitors shift the yeast-mycelium dimorphic potential of Ceratocystis ulmi. Our data are consistent with the conclusions that Ca(II)-calmodulin interaction is necessary for mycelial growth in C. ulmi and that the absence of this
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16. High Aluminum Resistance in Buckwheat1 : I. Al-induced Specific Secretion of Oxalic Acid from Root Tips
High Al resistance in buckwheat (Fagopyrum esculentum Moench. cv Jianxi) has been suggested to be associated with both internal and external detoxification mechanisms. In this study the characteristics of the external detoxification mechanism, Al-induced secretion of oxalic acid, were investigated. Eleven days of P depletion failed to induce secretion
American Society of Plant Physiologists.
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17. Calmodulin Is Involved in Heat Shock Signal Transduction in Wheat1
The involvement of calcium and calcium-activated calmodulin (Ca2+-CaM) in heat shock (HS) signal transduction in wheat (Triticum aestivum) was investigated. Using Fluo-3/acetoxymethyl esters and laser scanning confocal microscopy, it was found that the increase of intracellular free calcium ion concentration started within 1 min after a 37°C HS. The le
The American Society for Plant Biologists.
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18. Ca2+ and Calmodulin Dynamics during Photopolarization in Fucus serratus Zygotes.
The role of Ca2+ in zygote polarization in fucoid algae (Fucus, Ascophyllum, and Pelvetia species) zygote polarization is controversial. Using a local source of Fucus serratus, we established that zygotes form a polar axis relative to unilateral light (photopolarization) between 8 and 14 h after fertilization (AF), and become committed to this polarity at ap
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19. Victorin induction of an apoptotic/senescence-like response in oats.
Victorin is a host-selective toxin produced by Cochliobolus victoriae, the causal agent of victoria blight of oats. Previously, victorin was shown to be bound specifically by two proteins of the mitochondrial glycine decarboxylase complex, at least one of which binds victorin only in toxin-sensitive genotypes in vivo. This enzyme complex is involved in the p
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20. Action of gastrin in guinea pig oxyntic cells. Studies using quantitative cytochemistry.
The mechanism of action of gastrin was investigated using cytochemical quantitation of hydroxyl ion production (HIP) in guinea pig gastric oxyntic mucosa. The reaction depends upon the trapping of OH ions produced during gastric stimulation and is blocked by the benzimidazole, Hassle 149/94, which inhibits the K+ + H+-ATPase and by acetazolamide, an inhibito
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21. Endonuclease-resistant apyrimidinic sites formed by neocarzinostatin at cytosine residues in DNA: evidence for a possible role in mutagenesis.
When defined-sequence DNA from the lacl region of plasmid pMC1 was treated with the nonprotein chromophore of neocarzinostatin in the presence of various thiols, the predominant lesions were direct strand breaks, occurring primarily at thymine and adenine residues. In the presence of glutathione, however, alkali-dependent strand breaks, occurring at certain
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22. Effect of Lanthanum on Ion Absorption in Corn Roots 1
Short term (10 min) influx of 86Rb-labeled potassium into corn (Zea mays L. WF9 × M14) root segments was inhibited by La (NO3)3 or LaCl3. Half maximal inhibition of K+ influx from 0.25 mm KCl was obtained with 0.025 mm La3+. Kinetic analysis indicated the inhibition to be of a competitive nature. With absorption periods exceeding one hour, La3+ no longer in
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23. Migration of Calcium and Its Role in the Regulation of Seismonasty in the Motor Cell of Mimosa pudica L. 1
Volume and conformational changes of the contractile tannin vacuoles of the abaxial motor cells of the primary pulvinus of Mimosa pudica L. parallel the seismonastic leaf movement. Since such changes in cells and organelles of animal systems are often regulated by calcium, we studied Ca2+ movement in the motor cells and tissue. By fixation with Lillie's neut
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24. Involvement of Calcium in the Photoperiodic Flower Induction Process of Pharbitis nil
EGTA, a specific Ca2+ chelator, inhibited the flowering response of Pharbitis nil when applied to the cotyledons immediately before the inductive dark period. Calcium sprayed 30 minutes after the EGTA blocked the effect of EGTA. The length of the critical dark period was increased both by EGTA and by LaCl3. The calmodulin antagonists W-7 and chlorpromazine a