Abstract: Aspects of the present invention provide novel methods and devices for sampling gas, exciting the sampled gas to emit radiation and detecting in real time from the emitted radiation a plurality of wave bands of an emission spectrum. Energy used to excite the sampled gas may be adjusted based on the detected wave bands. A process may be controlled in real time based on the detected wave bands. Novel interfaces may be used to display portions of the detected wave bands. A known flow of a reference gas may be included in the flow of sampled gases and an unknown flow of an unknown flow gas determined.

Abstract: Aspects of the present invention provide novel methods and devices for sampling gas, exciting the sampled gas to emit radiation and detecting in real time from the emitted radiation a plurality of wave bands of an emission spectrum. Energy used to excite the sampled gas may be adjusted based on the detected wave bands. A process may be controlled in real time based on the detected wave bands. Novel interfaces may be used to display portions of the detected wave bands. A known flow of a reference gas may be included in the flow of sampled gases and an unknown flow of an unknown flow gas determined.

Abstract: There is described the compound of formula I, ##STR1## and pharmaceutically acceptable derivatives thereof. Processes for making the compound and pharmaceutical, e.g. anti-asthmatic, compositions containing it are also described.

Abstract: There are described compounds of formula I, ##STR1## in which R.sub.3 represents hydrogen, or alkyl C 1 to 6,R.sub.S represents hydrogen, hydroxy, alkoxy C 1 to 6, alkanoyloxy C 2 to 6, alkenyloxy C 2 to 6, nitro, --NR.sub.1 R.sub.2, halogen, alkyl C 1 to 6, hydroxy-alkyl C 1 to 6, or hydroxy-alkoxy C 1 to 6,an adjacent pair of X, Y and Z form a --(CH.sub.2).sub.4 --, --CH.dbd.CH--CH.dbd.CH-- or --O(CH.sub.2).sub.3 -- chain, each of the chains optionally being substituted by one or two C 1 to 6 alkyl groups, and the remaining substituent X or Z represents alkenyl C 2 to 6 optionally substituted by phenyl; halogen; or alkyl C 1 to 9 optionally substituted by one or more of the groups hydroxy, halogen, carbonyl oxygen, phenyl, or alkoxy C 1 to 6,or, when an adjacent pair of X, Y and Z form a chain substituted by one or two C 1 to 6 alkyl groups, the remaining substituent X or Z may be hydrogen, andR.sub.1 and R.sub.

Abstract: There are described compounds of formula I, ##STR1## in which R.sub.3 represents hydrogen, or alkyl C 1 to 6, R.sub.5 represents hydrogen, hydroxy, alkoxy C 1 to 6, alkanoyloxy C 2 to 6, alkenyloxy C 2 to 6, nitro, -NR.sub.1 R.sub.2, halogen, alkyl C 1 to 6, hydroxy-alkyl C 1 to 6, or hydroxy-alkoxy C 1 to 6,An adjacent pair of X, Y and Z form a --(CH.sub.2).sub.4 --, --CH.dbd.CH--CH.dbd.CH--or --O(CH.sub.2).sub.3 --chain, each of the chains optionally being substituted by one or two C 1 to 6 alkyl groups, and the remaining substituent X or Z represents alkenyl C2 to 6 optionally substituted by phenyl; halogen; or alkyl C 1 to 9 optionally substituted by one or more of the groups hydroxy, halogen, carbonyl oxygen, phenyl, or alkoxy C 1 to 6,Or, when an adjacent pair of X, Y and Z form a chain substituted by one or two C 1 to 6 alkyl groups, the remaining substituent X or Z may be hydrogen, andR.sub.1 and R.sub.

Abstract: There is provided a process for the preparation of coumarin derivatives of the formula: ##STR1## (wherein R represents substituted or unsubstituted alkyl, aryl or aralkyl, R.sup.1 represents alkanoyl, and the hydroxy and R.sup.1 substituents are ortho to one another) in which a hydroxy-substituted coumarin of the formula: ##STR2## is acylated in the presence of a Friedel-Crafts catalyst. The compounds of formula I are intermediates in the preparation of certain pharmaceutically-active chromones.

Abstract: Pharmaceutical compounds of formula I, ##SPC1##in whichP, q, r, and T, which may be the same or different, each represent hydrogen, an alkyl, hydroxy, alkoxy, hydroxyalkoxy, alkoxyalkoxy, acetoxy, carboxy, amino, alkylamino, dialkylamino, alkenyl, p-toluenesulphonyloxy, aralkyl, phenyl, nitro, carboxy ester, alkenyloxy or acyl group, none of which groups contain more than 10 carbon atoms or an adjacent pair of P, Q, R and T, together with the adjacent carbon atoms in the benzene ring may form a fused 5 or 6 membered carbocyclic or oxygen containing heterocyclic ring, andV and W, which are different, each represent oxygen or sulphur.