Bacterial leakage in root canals filled with calcium hydroxide paste associated with different vehicles. (49/184)

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Biotransformations of 2-methylisoborneol by camphor-degrading bacteria. (50/184)

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Absolute helicity induction in three-dimensional homochiral frameworks. (51/184)

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Sakel versus Meduna: different strokes, different styles of scientific discovery. (52/184)

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Ionization dependence of camphor binding and spin conversion of the complex between cytochrome P-450 and camphor. Kinetic and static studies at sub-zero temperatures. (53/184)

The kinetic rate constants of formation and dissociation of the cytochrome-P-450 - camphor complex (Fe3+-RH) have been obtained by low-temperature (+ 5 degrees C to -20 degrees C) stopped-flow experiments. Simiarly the high-spin/low-spin equilibrium of this complex has been studied as a function of temperature and protonic activity. Both the camphor-binding mechanism and the high-spin/low-spin thermodynamic parameters of Fe3+-RH depend on the protonic activity of the medium in the physiological pH range. The binding rate constants are shown to depend on the ionization of a residue of the protein, probably a histidine. Linear enthalpy-entropy compensation is observed for the camphor binding as well as for the spin-state transition. A camphor-binding-induced change of the electrostatic potential is discussed.  (+info)

Effect of daidzein, 4-methylbenzylidene camphor or estrogen on gastrocnemius muscle of osteoporotic rats undergoing tibia healing period. (54/184)

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Effectiveness of surface protection for glass-ionomer, resin-modified glass-ionomer and polyacid-modified composite resins. (55/184)

The purpose of this study was to evaluate the effectiveness of several surface protectors for a glass-ionomer, a resin-modified glass-ionomer, and a polyacid-modified resin cement by determining dye uptake spectrophotometrically. 378 samples, made up of Ionofil U, Vitremer, and Dyract, were prepared and divided into groups of seven each. Positive and negative control specimens remained unprotected while the experimental specimens were protected with Finishing Gloss, Protect-It, LC Varnish, Adper Single Bond, or a nail varnish. The experimental groups and positive controls were immersed in 0.05% methylene blue solution, while the negative controls were immersed in deionized water. Results were evaluated using variance analysis. Of the Ionofil U group, Adper Single Bond exhibited the least effective surface coating among the materials tested, while the best surface protection was obtained with LC Varnish in the Dyract group. However, no statistically significant differences were observed in the Vitremer group.  (+info)

Structural and dynamic implications of an effector-induced backbone amide cis-trans isomerization in cytochrome P450cam. (56/184)

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