A significant upper limit for the rate of formation, of OCS from the reaction of OH with CS2

The rate of reaction of OH with CS2 to form OCS by reaction (1) has been measured through observation of O14CS following 254 nm equation image photolysis of mixtures of H2O2 with 14CS2. The OH concentrations have been monitored through simultaneous measurement in the same cell of either (a) the oxidation of CO to CO2, or (b) the removal of a hydrocarbon such as C3H8 or iso-C4H10. The upper limit for the formation of OCS based on (a) corresponds to a rate constant k1 < 0.3 × 10−14 cm³ molecule−1 sec−1. Other chemical reactions in the system have led to the formation of both 14CO and 14CO2, indicating the existence of a complex combination of reactions such that the observed O14CS need not have been formed by (1). The rate of reaction (1) is sufficiently slow that it is neither an important atmospheric sink for CS2 nor an important source for atmospheric OCS. The reaction of OH with OCS has not been measured in these experiments, but by analogy with k1 it is probably not an important atmospheric sink for OCS nor an important source of SO2

A note on the analysis of 3<SUP>3</SUP> and 3<SUP>4</SUP> designs (with three factor interactions confounded) in field experiments in agriculture

In this paper the authors deal with two modern designs of field experiments described by Yates in Technical Communication No. 35 of the Imperial Bureau of Soil Science. The object of their note is to "explain fully the computations involved in the analysis of such designs so that they may be easily understood by the agricultural experimenter in India". Data from an experiment on sugar cane carried out at Shahjahanpur during 1938-9 are used to demonstrate the analysis of a partially confounded 33 design in which three different methods of interculture were tested at three different levels of nitrogen manure with the number of irrigations varying between 2 and 6. To demonstrate the analysis of a confounded or partially confounded 34 design data from a real experiment were not available and the results of a uniformity trial with dummy treatments superimposed had to be used for the purpose

Cost Effectiveness of Using Array-CGH for Diagnosing Learning Disability

To undertake a cost-effectiveness analysis of using microarray comparative genomic hybridisation (array-CGH) as a first-line test versus as a second-line test for the diagnosis of causal chromosomal abnormalities in patients referred to a NHS clinical genetics service in the UK with idiopathic learning disability, developmental delay and/or congenital anomalies

Origin of impurities formed in the polyurethane production chain. 1: conditions for chlorine transfer from an aryl isocyanide dichloride byproduct

Phenyl and 4-methylphenyl isocyanide dichlorides are models for byproduct that may be formed in the later stages of certain polyurethane production chains. Photochemical electron paramagnetic resonance (EPR) studies (λ &gt; 310 nm), using the spin trap, N-tert-butyl-α-phenylnitrone, confirm a previously made suggestion that ArN═CCl2 can behave as a chlorine radical source. EPR spectra recorded during and after irradiation and supported by simulations evolve over time and indicate formation of the short-lived spin trap–Cl• adduct and a longer lived benzoyl-N-tert-butylnitroxide radical. Photolysis of C6H5N═CCl2, either alone or mixed with methylene diaryl isocyanate species, in o-C6H4Cl2, a polyurethane process solvent, led to the formation of mixtures containing dichloro- and trichlorobiphenyl isomers