Cardiac arrhythmias are an important cause of morbidity and mortality approximately 400,000 people per year die from myocardial infarctions (MI) in the United States alone. Individuals with MI exhibit some form of dysrhythmia within 48 h. Post-mortem examinations of MI victims indicate that many die in spite of the fact that the mass of ventricular muscle deprived of its blood supply is often quite small. These data suggest that the cause of death is ventricular fibrillation and that the immediate availability of a safe and efficacious antiarrhythmic agent could have prolonged a number of Hves. The goals of antiarrhythmic therapy are to reduce the incidence of sudden death and to alleviate the symptoms of arrhythmias, such as palpitations and syncope. Several excellent reviews of the mechanisms of arrhythmias and the pharmacology of antiarrhythmic agents have been pubflshed (1,2).  [c.110]

Manufacture of semiconductors using lithographic techniques involving either the selective degradaton or cross-linking of polymers with the associated stages of etching, doping and passivation of the substrate using the imaged protective coating or resist. Polymers used include cyclised synthetic polyisoprene rubber and phenolic novolak resins.  [c.120]

As the production methods of MWCNTs is very efficient [8] (see Chaps. 2 and 12), it is an advantage to implement a filling procedure after the synthesis. A promising approach to fill CNT cavities, could exploit the capillary properties that have been revealed by Ajayan and lijima [9]. Subsequent studies by Dujardin et al.[10] allowed the estimations of a surface tension threshold in order to select materials that are good candidates to wet and fill CNTs.  [c.129]

In their study on CNT capillarity, Dujardin et al. [10] observed the spontaneous immersion/floatation of CNTs in different substances. This experiments allowed the authors to derive a threshold surface tension value over which no wetting and in consequence no capillary effect was expected. They showed that compounds displaying a surface tension < 100-200 mNm" are potential candidates for CNT-filling materials. The list includes many solvents such as water, ethanol, acids, some low surface tension oxides (PbO, V2O5, etc.) and some low melting point substances as S, Cs, Rb and Se [19]. However, these experiments revealed that most of the scientific and technological interesting materials to form nanometric needles such as low melting point metals (Pb, Ga, Hg, etc.) would not enter the tubes spontaneously [19].  [c.132]

The capillary filling of CNTs is basically and usually described using macroscopic thermodynamic approximations. For example, Dujardin et al. [10] concluded that the surface-tension threshold value for filling a CNT was 100-200  [c.140]

After all the compounds which were cited in the older literature as diaziridines had been shown to be incorrectly formulated, the first authentic diaziridines appeared in the literature in 1959. Schmitz obtained A-methyl-1,2-diaziridino-l, 2,3,4-tetrahydroisoquinoline (34)  [c.104]

The rate of iodine formation depends on the degree of A"-substitu-tion. Compounds which are unsubstituted on both the iV-atoms (35) and those wdth a single A -substituent (43) liberate instantly the calculated quantity of iodine in the cold. However, the 1,2-disubstituted diaziridines (44) need brief heating with the acid iodine solution they then give 95-100% of the calculated iodine. " This effect of substitution is so well defined that it can be used for a proof of constitution. The diaziridino-triazolidincs (37) prepared from aldehydes, ammonia, and chloramine give complete iodine liberation only on heating. Thus the structure 57 which is isomeric with 37 can be eliminated.  [c.116]

The hydrolysis of the diaziridine 34 to the cyclic hydrazonium salt 61 [Eq, (49)] occurs quantitatively. Hydrolysis of the diaziridino-triazolidine (37) gives 3 moles of aldehyde and 1 mole each of hydrazine and ammonia [Eq. (50)].  [c.120]

For study purposes the effects of performance as related to fan horsepower may be patterned after Figures 9-121 and 9-122. The conditions for actual air inlet condiuons for an induced draft fan must be obtained from Equation 9-127 read from a diagrtim similar to Figure 9-109.  [c.393]

Helling, R. K-, and M. A. Desjardin, Get the Best Performance from Structured Packing, Chem. Eng. Progress, V. 90, No. 10, (1994) p. 62.  [c.415]

See pages that mention the term Dacrydene : [c.2850]    [c.109]    [c.339]    [c.232]    [c.14]    [c.162]    [c.146]    [c.148]    [c.141]    [c.183]    [c.38]    [c.939]    [c.113]    [c.106]    [c.121]    [c.121]    [c.123]    [c.779]    [c.948]    [c.1283]    [c.1290]    [c.1290]    [c.1290]    [c.1688]    [c.1688]    [c.1689]    [c.1689]    [c.1693]    [c.1693]    [c.409]   
The chemistry of essential oils and artificial perfumes Volume 2 (1922) -- [ c.76 ]