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Ultra bright torch bulb
Volume 19/Number 12/December 1988
Ultra Bright Torch Bulb Nitech Limited, manufacturers of the X-Cell halogen range of rechargeable torches, are now offering a new line in beam strength--the Nitech 1000 bulb. In general terms, when fitted to any of their torches, the Nitech 1000 increases beam output by 4-5 times as compared to the Nitech 500 which, in itself, is around double the brightness of the Nitech 300. In fact the Nitech 1000 is powerful enough to be used as a photographic floodlight in certain conditions. Under most circumstances the Nitech 1000 should offer 150 000 to 200 000 candlepower and has an operating life of 50 hours.
The new Nitech 1000 bulb.
Marine Biochemistry Biochimie Marine by Yves Le Gal. Masson, Paris, 1988. 285 pp. (In French.) Price: FF 180. ISBN: 2-22281277-2.
Papers on marine biochemistry are distributed throughout a wide literature and assimilating them into a single, comprehensive treatise is a formidable task. The all-embracing title used for the present volume should not be taken to imply that the problem has now been overcome. The opening chapter is concerned with organic compounds in the sea. It outlines their distribution between dissolved and particulate fractions and gives a brief account of some of the components of each. Changes with depth of total dissolved and total particulate organic material are briefly referred to, but the detailed biochemical compositions of these fractions are not considered. Important work thereby overlooked includes a whole series of American studies, carried out in the early 1980s, on the vertical fluxes of many classes of lipids, and amino acids. The author provides more detailed accounts of the methods used for estimating biomass by measuring compounds universally present in living material, particular attention being given to ATP and DNA. There is, however, no mention of more
For further details contact: Nitech Ltd, Unit 26, Churchfields Trading Estate, St Leonards on Sea, East Sussex TN38 9RT, UK.
Chemical/Vapour Pump Genevac Ltd launched their new vacuum pump (the CVP100/2) at the British Laboratory Exhibition held in October. This powerful pump has an ultimate vacuum of 0.05 mbar and a flow rate of 100 1 min -~. It will handle 100% water vapour and vapours from organic solvents, acids and bases direct without the need for a refrigerated or chemical trap. The CVP100/2 can be used to replace rotary vane pumps of freeze dryers thereby eliminating problems of pump corrosion and loss of vacuum due to oil contamination. When combined with a centrifugal evaporator there is no longer a requirement for any conventional accessories such as chemical traps, refrigerated traps, or water jet pumps. At the exhibition Genevac also showed three other new products to be used in conjunction with their vacuum pumps: a small capacity freeze dryer, a centrifugal evaporator, and a slab gel dryer. For further information contact: Genevac Ltd, White House Road, Ipswich IP1 5LU, UK.
specific biochemical compounds used in characterizing particular groups of living organisms, examples here being certain sterols in dinoflagellates, long-chain ketones in coccolithophores, and wax esters in copepods. The chapter ends with brief accounts of the carbon, nitrogen, phosphorous, and sulphur cycles in the sea. The second chapter deals with nutrition and assimilation. It begins with a useful account of primary production, particular attention being paid to biochemical aspects of carbon and nitrogen assimilation. Treatment of the nutrition of heterotrophic organisms includes a detailed consideration of digestive enzymes in invertebrates, and the section on crustaceans refers to recent work on how the activities of such enzymes vary in response to quality and quantity of food. Strangely, however, no reference is made to important studies of this topic by French workers such as Mayzaud and his colleagues. The numerous measurements of feeding efficiency made with invertebrates are not considered by the author, possibly because until very recently such measurements dealt only with bulk constituents of the diet and did not include work with individual biochemical components. Less understandable, however, is the omission of any reference to the substantial body of work that has been done on the nutrition of fish. Also unmentioned is recent work on 675
Ultra Bright Torch Bulb Nitech Limited, manufacturers of the X-Cell halogen range of rechargeable torches, are now offering a new line in beam strength--the Nitech 1000 bulb. In general terms, when fitted to any of their torches, the Nitech 1000 increases beam output by 4-5 times as compared to the Nitech 500 which, in itself, is around double the brightness of the Nitech 300. In fact the Nitech 1000 is powerful enough to be used as a photographic floodlight in certain conditions. Under most circumstances the Nitech 1000 should offer 150 000 to 200 000 candlepower and has an operating life of 50 hours.
The new Nitech 1000 bulb.
Marine Biochemistry Biochimie Marine by Yves Le Gal. Masson, Paris, 1988. 285 pp. (In French.) Price: FF 180. ISBN: 2-22281277-2.
Papers on marine biochemistry are distributed throughout a wide literature and assimilating them into a single, comprehensive treatise is a formidable task. The all-embracing title used for the present volume should not be taken to imply that the problem has now been overcome. The opening chapter is concerned with organic compounds in the sea. It outlines their distribution between dissolved and particulate fractions and gives a brief account of some of the components of each. Changes with depth of total dissolved and total particulate organic material are briefly referred to, but the detailed biochemical compositions of these fractions are not considered. Important work thereby overlooked includes a whole series of American studies, carried out in the early 1980s, on the vertical fluxes of many classes of lipids, and amino acids. The author provides more detailed accounts of the methods used for estimating biomass by measuring compounds universally present in living material, particular attention being given to ATP and DNA. There is, however, no mention of more
For further details contact: Nitech Ltd, Unit 26, Churchfields Trading Estate, St Leonards on Sea, East Sussex TN38 9RT, UK.
Chemical/Vapour Pump Genevac Ltd launched their new vacuum pump (the CVP100/2) at the British Laboratory Exhibition held in October. This powerful pump has an ultimate vacuum of 0.05 mbar and a flow rate of 100 1 min -~. It will handle 100% water vapour and vapours from organic solvents, acids and bases direct without the need for a refrigerated or chemical trap. The CVP100/2 can be used to replace rotary vane pumps of freeze dryers thereby eliminating problems of pump corrosion and loss of vacuum due to oil contamination. When combined with a centrifugal evaporator there is no longer a requirement for any conventional accessories such as chemical traps, refrigerated traps, or water jet pumps. At the exhibition Genevac also showed three other new products to be used in conjunction with their vacuum pumps: a small capacity freeze dryer, a centrifugal evaporator, and a slab gel dryer. For further information contact: Genevac Ltd, White House Road, Ipswich IP1 5LU, UK.
specific biochemical compounds used in characterizing particular groups of living organisms, examples here being certain sterols in dinoflagellates, long-chain ketones in coccolithophores, and wax esters in copepods. The chapter ends with brief accounts of the carbon, nitrogen, phosphorous, and sulphur cycles in the sea. The second chapter deals with nutrition and assimilation. It begins with a useful account of primary production, particular attention being paid to biochemical aspects of carbon and nitrogen assimilation. Treatment of the nutrition of heterotrophic organisms includes a detailed consideration of digestive enzymes in invertebrates, and the section on crustaceans refers to recent work on how the activities of such enzymes vary in response to quality and quantity of food. Strangely, however, no reference is made to important studies of this topic by French workers such as Mayzaud and his colleagues. The numerous measurements of feeding efficiency made with invertebrates are not considered by the author, possibly because until very recently such measurements dealt only with bulk constituents of the diet and did not include work with individual biochemical components. Less understandable, however, is the omission of any reference to the substantial body of work that has been done on the nutrition of fish. Also unmentioned is recent work on 675