Physical Sciences and Mathematics Commons^™

Iron And Life, Thomas Emery

Faculty Honor Lectures

Iron, iron, everywhere but. . . . The plight of the ancient mariner surrounded by undrinkable water could hardly have been more frustrating than life on earth with respect to iron. Iron is the fourth most abundant element of the earth's surface, exceeded only by oxygen, silicon, and aluminum. Virtually all forms of life from the simplest bacteria to humans require iron to catalyze numerous and complex metabolic reactions. Because of the diversity and complexity of the role of iron in the life process, it has even been suggested that the origin of life on earth centered around the catalytic …

Effects Of Pesticides On Immune Competency: Influence Of Methyl Parathion And Carbofuran On Immunologic Responses To Salmonella Typhimurium Infection, Anna M. Fan

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Immunologic competence is correlated with resistance to infectious disease which may be affected by exposure to certain compounds. Methyl parathion (MP) and carbofuran (CF) have been reported to affect the development of active immunity in the rabbit and the present research was conducted to quantify the dosage relationships of these two pesticides to both host resistance and acquired resistance in the mouse.

Preliminary study was made on the virulence of Salmonella typhimurium in mice. Mortality rates among infected animals fed Purina Laboratory Chow diet providing 0.08, 0.7 3.0 mg MP/kg/day or 0.1, 0.6, 1.0 mg CF/kg/day along with untreated controls …

Simple Parallel Interface Between An Optical Multichannel Analyzer And A Microprocessor, Stephen E. Bialkowski

Stephen E. Bialkowski

A simple circuit is given which will allow data transfer from a LSI‐11 DRV11 parallel interface unit to a PARC 1216 Optical Multichannel Detector Controller. The Circuit for OMA to LSI‐11 data transfer is slightly more complicated. Data buffering is used so that data transfer can occur without time‐out loss due to the dynamic memory refresh cycle of the LSI‐11. The circuit may be constructed and mounted within the PARC 1216 unit with only minor, noncritical, modifications to the controller unit. The unit is able to transmit data from the 1216 controller running at dwell times as short as 40 …

The Determination Of Mass Transport Coefficients And Vibrational Relaxation Rates Of Speciesformed In Laser Photolysis Experiments, Stephen E. Bialkowski, David S. King, John C. Stephenson

Stephen E. Bialkowski

A simple analytical solution of the equations which govern the formation, collisional relaxation, and mass transport rates of species produced in radially symmetric laser‐induced processes is given. These equations are specifically applied to the CO₂ laser‐induced dissociations of CF₂HCl and C₂F₃Cl dilute in argon. The concentration of the vibrational ground state of the CF₂ radical product was probed as a function of time and pressure both during and after the photolyzing laser pulse by the laser‐excited fluorescence technique. From these measurements, the vibrational relaxation rate of ? CF₂ in argon was …

Energy Partitioning In The Ir Multiphoton Dissociation Of Molecules: Energy Of Xcf2 And Xcfcl Fromcf2Cfcl, John C. Stephenson, Stephen E. Bialkowski, David S. King

Stephen E. Bialkowski

We have measured the vibrational (v), rotational (J,K), and translational energy, (E_T), of the X̃ CF₂ and X̃ CFCl fragments formed in the CO₂ laser induced multiphoton dissociation of CF₂CFCl (chlorotrifluoroethylene): CF₂CFCl→CF₂(v,J,K)+CFCl(v,J,K)+E_T(v,J,K), which was the only detectable reaction path for CF₂CFCl. More vibrational energy (E_v) appears in CF₂ than in CFCl. Direct spectroscopicmeasurements of populations in levels 0<ν₂<7 show that E_v is distributed statistically in the bending mode (ν₂) of CF₂ according to P(E_v)=exp(−E_v/k T_v), …