VOLUME 2, NO2, JUN 1980

The Adsorption Characteristic of Ruthenium Dipyridyl and Ortho-Phenanthroline Derivatives

Ten Pyridyl-substituted Pyrazine ligands containing ferroin atomic grouping have been examined as complexing reagents for ruthenium (ii) and their mow absorp1ivities at their respeo¬tive ~ax have been reported. The effect of methyl substitution on absorptread more

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M Y KHUHAWAR ,

Vaporization Kinetics of Alcohols

The vaporization kinetics of hydrogen bonded alcohols (n-butanol, iso-butanol, n­pentanol and iIo-pentanol) in air bave been studied at temperatures from 25 - 500C, under atmos­pheric pressure c~ditions. From the experimental vaporization curves, the activation enthalpy of vaporization  was computed. A comparison between the observed vaporization rate Jobs, and the maximum possible rate Jmax, computed from the well known Langmuir equation, yielded the vaporization coefficient cy From JJilax curves, the enthalpy of vaporization ~Hv' has also been cal­culated. Attempt has been made to correlate the activation enthalpy of vaporization ~"v *, with the number of hydrogen bonds broken in the alcohol cluster during the vaporization process. read more

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J IQBAL ,M SALEEM ,M AFZAL ,

The Synthesis of a Series of N,N'-(Bis-disubstituted aminomethyl].S-arylidenebarbituric Acids, and their Antiinflammatory Activity.

S-AIylidene barbituric acids were obtained by the Perkin condensation between a series of aromatic aldehydes and the active methylene group of barbituric acid. Through Mannich con­devation of these barbituric acid derivatives with secodary amines and formaldehyde, twelve Mannich bases were prepared. Six of the final compounds were screened for their antiinflammatory activity and toxicity. Three compounds were found to inhibit inflamation by 20%-32% . read more

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R K SATSANGI ,S M M ZAIDI ,S S TIWARI ,

Isolation of Replicative Intermediates during Brome Mosaic Virus (BMV) Development

BMV development was studied in well defmed physiological conditions, avoiding the use of antibiotics or excision of the roots. For an adequate labelling, to distinguish between host and viral RNAs, different periods of exposure to 32p were required, depending upon the post-inocu1ation time of infected plants and corresponding age of healthy controL Within the period of normal outlook of the plants, the rate of 32p· incorporation into BMV RNA was much higher than into barley n'boso­mal RNA in infected tissue or in comparable healthy tissue.Analysis of the replicative structures isolated from infected plants revealed that only the three largest RNAs (A,K,B) had their own replicative intermediates (R I). This material was shown to con­tain a certain amount of intact viral RNA species, which were stable when treated with heat and for­mamide, excluding the possibility of hidden breaks. read more

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ELIE GILLIS ,Z A KHAN ,

Formation COnstants of Cobalt (II) and Murexide 1:1 Complex in Methanol-Water Mixture

The formation constant of Cobalt(ll) and Mmexide (1:1) complex were obtained spectrophotmetlically in water and 1.8, 3.7, 5.7, 7.8, and 10.1 mole percent ofmet1lanolin water at 294°, 298°, 304°, and 309° K. The enthalpies and entropies were calculated and the data was ex­plained in term, of ordering-disordering effect of co-solvent on bulk solvent water.read more

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S AHMAD ,M A A ZUBERI ,S H HABIB ,S A ZUBAIRI ,

Reaction of Acetophenone with Cupric Bromide

Reaction of Acetophenone with Cupric Bromideread more

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A KAZMI ,M KHAN ,S M IFZAL ,R AKHTAR ,

Isolation of Betaine from Lycium Barbarum

Isolation of Betaine from Lycium Barbarumread more

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V U AHMAD ,M A SULTAN ,

Approaches for the Synthesis of D-Arabinosyl Nuclesides and their Derivatives

Approaches for the Synthesis of D-Arabinosyl Nuclesides and their Derivativesread more

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g R NIAZ ,