The complex interplay of temperature and water activity (aw) / relative humidity (RH) on the solid form stability and transformation pathways of three hydrates (HyA, HyB and HyC), an isostructural dehydrate (HyAdehy ), an anhydrate (AH) and amorphous brucine has been elucidated and the transformation enthalpies quantified. The dihydrate (HyA) shows a non-stoichimetric (de)hydration behavior at ...

The membrane potential responses of Paramecium caudatum to the external application of bitter substances were examined by employing conventional electrophysiological techniques. Mutant cells defective in voltage-gated Ca2+ channels were used to record the potential responses in the absence of contamination by Ca2+ action potentials. The cells produced a transient depolarization followed by a tr...

The separation performance of inorganic anions ReO4(-), Br(-), SO4(2-), and NO3(-) using porphyrin-alkaloid quaternary salt transporters is examined using parallel artificial membrane permeability assay. Active and selective transport of perrhenate is achieved by porphyrin-brucine conjugates. Herein, chlorides are used as antiporters and complete removal of perrhenates from a source solution is...

____________________________________ Part I, Sampling__ ____________ _____________ Sample preservation _,____.___ ___.___.__._ References__________-._______,-_-___--_-Carbon, all forms. ____-________---____.____ References..-,. __._ _________________ Chlorophylls.__-__ __._„____,_____._____ Extractive spectrophotometric method. __ References. ______..„__________________ Color. ___---_-_._____. ...

Brucine diol (BD) catalyzed asymmetric Morita–Baylis–Hillman (MBH) reaction is observed for the first time. N-oxide (BNO) was found to not have an effective chiral catalyst. Faster rate obtained using unsaturated ester or aromatic aldehydes in presence of BNO. 4-Nitrobenzaldehyde and α,β-unsaturated ketone/ester were converted MBH adduct moderate yields (up 74%) with 70% ee value by this cataly...

Several alkaloids derivatives have developed; nevertheless, expensive reagents and special conditions are required. Therefore, in this study, two alkaloids (brucine and strychnine derivatives) were prepared using several strategies; the structure of compounds obtainedwas confirmed by elemental analysis, spectroscopy and spectrometry data. In conclusion, the methods used offers some advantages s...

Specificity of Reactions-Several alkaloids were tested for their reaction with chloride, bromide, and iodide ions. The test system was as follows: From 0.01 to 0.05 milliequivalent of the halogen compound (sodium salt) was placed in calorimeter cuvettes. Water was added to make a volume of 5 ml. and then 2 ml. of 50 per cent phosphoric acid were added. 1 ml. of a 1 per cent solution of the alka...

Ayurvedic preparations claim on their label only the quantity of crude drugs and not the quantity of active ingredients present therein. So work was taken up to find the percentage of strychnine and brucine from Ayurvedic pills of Nux vomica powder by TLC spectrophotometric analysis, which study has not been reported earlier. However, the literature survey only revealed the following work.