C. R. Parsons

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Observations of contracting muscle fibrils in cultured cells indicate that the force which restores the resting length of the sarcomere comes from the contractile elements themselves and not from external elasticity, as is now generally accepted. In light of biochemical studies on the contraction-relaxation cycle, it is postulated that the elongating force(More)
The collective acceleration of light and heavy ions using an intense linear electron beam (1.5 MeV, 35 kA, 35 ns) injected into a localized ion source has been studied experimentally. The ion source is provided either by electron beam induced ionization of a neutral gas cloud from a fast puff valve or from a 15 Joule, Q-switched ruby laser fired at targets(More)
The pineal gland of vertebrates produces and secretes the hormone melatonin in response to changes in the light-dark cycle, with high production at night and low production during the day. Melatonin is thought to play an important role in synchronizing daily and/or seasonal physiological, behavioral, and developmental rhythms in vertebrates. In this study,(More)
BACKGROUND Allergy to natural rubber latex (NRL) has been frequently reported in health care workers. However, there is little published evidence of the outcome of hospital intervention programs to reduce exposure and detect cases of sensitization early. OBJECTIVE This study assesses the effects of intervention to reduce NRL allergy in an Ontario teaching(More)
The relation of the interval of time between death and next-of-kin contact to outcome variables including response rates and data quality was examined in a nationally representative sample of 17,713 deaths of persons 25 years of age or older that occurred in the United States in 1986. For most of the outcome variables examined, the length of time had little(More)
The collective acceleration of ions (H, D, He, C, N, Ne, Al, Ar, Fe, Cu, Xe) from a well localized plasma immediately downstream of a relativistic electron beam diode is experimentally investigated. The ions are produced either by electron impact on a well confined gas cloud from a fast rise puff valve or by a high power (1OJ, 15ns), Q-switched ruby laser(More)
We report the isolation of lambda altSF, a variant of Escherichia coli phage lambda that substitutes sets of genes at high frequency. Two forms of the variant phage have been studied: lambda altSF lambda, which exhibits the immunity (repressor recognition) of phage lambda, and lambda altSF22, which exhibits the immunity of Salmonella phage P22. Lysates made(More)