Abstract:
Two enzymes, one an acetylmorphine carboxyesterase (AMCE), the other a morphine dehydrogenase (MDH), have been isolated from bacteria. The AMCE degrades heroin to morphine and the MDH oxidises morphine to morphinone, with the aid of a cofactor. These reactions are used in detection of heroin (using the two reactions coupled together) or morphine. The enzymes can be incorporated in sensors for this purpose.
Abstract:
An electrochemical sensor comprising an electrolyte and an analyte separated by a selectively permeable membrane characterised in that the electrolyte is an electrically conductive solid comprising a homogeneous dispersion of a polymeric matrix phase and an electrically conductive salt and substantially free of water. Preferably the polymeric matrix phase is plasticised, the plasticiser forming a continuous phase in which the conductive salt is dissolved. The sensor is used, for example, for sensing and measuring gases especially in transcutaneous measurement of blood gases.
Abstract:
Deux formes d'iso-enzymes de creatine phosphokinase (CK) dans les tissus animaux indiquent des lesions du muscle strie (forme MM) ou des lesions cardiaques (forme MB). L'invention permet d'effectuer une analyse plus simple et plus economique que celle utilisee anterieurement, decoulant de la decouverte que certains ions metalliques inhibent la forme MB tout en inhibant moins la forme MM ou meme en l'activant. Pour le serum humain des ions aluminium sont preferes. A partir de l'activite CK sans l'inhibiteur d'ions selectifs on peut determiner le CK total (formes MB + MM) et une comparaison de l'activite CK en presence et en l'absence de l'inhibiteur d'ions selectifs produit l'activite de la forme MB. Du phosphate de creatine et DPA sont normalement ajoutes pour determiner l'activite CK.
Abstract:
A crop cutting apparatus has two vertical axis rotary drum cutters (13), each having an upper rotor with a crop conveying surface (19) and a lower rotor carrying knives (21). Gears drive the upper and lower rotors at different angular velocities. The lower rotor has an annular rim (18) having an upper surface shaped to continue the outline of the conveying surface (19). The knives (21) protrude outwardly from beneath the rim (18) and rotate with the rim. A wiper brush (34) mounted on the conveying surface (19) projects outwardly over the rim (18) for lifting and transferring crop to the surface (19). The upper rotor may have conditioning brushes (35) for conveying crop and conditioning crop by relative movement between the brushes and the crop. The upper and lower rotors may be rotated in opposite senses to effect at least partial shear cutting.
Abstract:
Nouveaux composes ayant la formule (I) (FORMULE) ou (FORMULE) represente un bicyclo(2,2,1)hept-2Z-ene, bicyclo(2,2,1)heptane, un 7-oxabicyclo(2,2,1)hept-2Z-ene, un 7-oxabicyclo(2,2,1)heptane, un bicyclo(2,2,2)oct-2Z-ene ou un bicyclo(2,2,2)octane substitue en position 5 par le groupe R1 et en position 6 par le groupe C (R2)=NR, un 6,6-dimethyle-bicyclo(3,1,1)heptane substitue en position 5 par le groupe R1 et en position 6 par le groupe C (R2)=NR ou en position 5 par le groupe C (R2)=NR et en position 6 par le groupe R1, un cyclohex-1-ene ou cycloexane substitue en position 4 par le groupe R1 et en position 5 par le groupe C (R2)=NR ou un 1-hydroxycyclopentane substitue en position 2 par le groupe R1 et en position 2 par le groupe C (R2)=NR, R1 est un groupe 6-carboxyex-2-enyle ou une modification de celui-ci comme defini ici, R2 est l'hydrogene, un groupe hydrocarbure aliphatique ou un groupe hydrocarbure aliphatique substitue directement ou par l'intermediaire d'un atome d'oxygene ou de soufre par un groupe aromatique, et R est un groupe -OR3, -OR4, -A-R3 ou -N=R5, A representant -NH-, -NH.CO-, -NH.CO.CH2N(R6)-, -NH.SO2-, -NH.CO.NH ou -NH.CS.NH-, et ou R3 est un groupe hydrocarbure aliphatique, un groupe aromatique ou un groupe hydrocarbure aliphatique substitue directement ou par l'intermediaire d'un atome d'oxygene ou de soufre par un groupe aromatique, R4 est un groupe hydrocarbure aliphatique qui est substitue par l'intermediaire d'un atome d'oxygene par un groupe hydrocarbure aliphatique qui est lui-meme substitue par un groupe aromatique, R5 est un groupe hydrocarbure aliphatique, un groupe aromatique ou un groupe hydrocarbure aliphatique substitue directement ou par l'intermediaire d'un atome d'oxygene ou de soufre par un groupe aromatique, et R6 est l'hydrogene, un groupe hydrocarbure aliphatique, un groupe aromatique ou un groupe hydrocarbure aliphatique substitue directement ou par l'intermediaire d'un atome d'oxygene ou de soufre par un groupe aromatique, a condition que lorsque R est un groupe
Abstract:
A semiconductor device (1) including a monocrystalline region of semiconductor grey tin material (5) in intimate contact with a monocrystalline substrate (3). The region of semiconductor tin (5) is stabilised by interaction with the monocrystalline substrate (3) which has a crystallographic structure isomorphous with the structure of grey tin and an interatomic spacing matched to the interatomic spacing of the semiconductor region (5). The semiconductor region (5) may be further stabilised by inclusion of germanium dopant. The matching substrate (3) may be of indium antimonide, cadmium telluride, germanium or silicon material. Ohmic contact between a region of semiconductor tin (5) and a region of metal white tin (15) may be formed. Details of infra-red photovoltaic and photoconductive devices are given. The semiconductor region of tin may be grown by molecular beam epitaxy.
Abstract:
Apatite is conventionally made into a fertilizer material by treatment with a strong acid, requiring capital-intensive industry. Hydroxyapatite is treated above 1100C with alkali but world reserves are problematic. The invention treats apatite at 900C with sodium aluminosilicate/carbonate and siliceous material in quantities to keep the composition in terms of CaO, SiO u, Na uO and P uO u in or near the ternary system Ca uSiO u - Ca u(PO u) u - CaNaPO u.
Abstract translation:磷灰石通常用强酸处理制成肥料,需要资本密集型工业。 羟基磷灰石用碱处理超过1100℃,但世界储备是有问题的。 本发明在90℃处理磷灰石,其用量为硅铝酸钠/碳酸盐和硅质材料,以使CaO,SiO u,Na 2 O和P u u u u的组成保持在或接近 (u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u u
Abstract:
Compounds of formula 1 are useful in the separation of a gas such as oxygen, hydrogen, sulphur dioxide, alkenes and carbon monoxide from a fluid comprising the gas. I MnIILX2 In formula I: L represents a monodentate ligand of formula IA and X is a species capable of existing as an anion IA PR1R2R3 wherein R1, R2 and R3 which may be identical or different represent substituted or unsubstituted alkyl, cycloalkyl or aryl groups or hydrogen and X represents -Cl, -Br, -I, -CN, -NO2, -N03, -OH, -CNS or -CNO, provided that no more than two of the groups R1, R2 and R3 are substituted or unsubstituted aryl groups and that at least one of the groups R1, R2 and R3 is a substituted or unsubstituted alkyl, cycloalkyl or aryl group.
Abstract:
In a Michelson interferometer system arranged to give four output interferograms, two at each orthogonal direction of polarisation, the reflection and transmission coefficients of the interferometer beam splitter (10) at the two polarisation directions are chosen so that the ratios of the a.c. component to the d.c. component are equal in three of the interferograms. Difference signals derived from the three interferograms are suitable for use with an automatic, reversible, fringe counting system.