SLSC Letter Regarding Final Preparation for Flight

Correspondence from Dr. Addington to Winter 1970 Sierra Leone Program students, with final details regarding their trip and flight

SLSC Student-Teacher Evaluation Sheet

Evaluation sheet of student-teachers given to Sierra Leone teacher

SLSC 1970-1971 Trip Report and Participant Names, Placements, and Research Topics

Report of Foreign Study Program in Comparative Education, Education 39, September 1970-June 1971 and a list of the 14 student participants and data regarding their placement and research topics

SLSC Otterbein College Fact Sheet and Program Description Sent to Potential Donors

Description of the Sierra Leone Foreign Study program that was sent to supporters asking for their help in subsidizing the students\u27 costs with additional funds, as well as factual information about Otterbein College

SLSC Year 2 Letter of Approval

Correspondence from Dr. Addington to Mildred Stauffer, while she was in Sierra Leone, confirming approval for a second year of the Sierra Leone Program

Nutritional enhancement of cereal milling wastes using enzymes

Wheatfeed is a low value by-product of the cereal milling industry and has potential as an ingredient of pet foods. However, it has a high fibre content and this renders it unsuitable for non-ruminants unless some means can be found to convert the fibre to more digestible substances. This work considers enzyme hydrolysis as a means for improving the nutritional value of wheatfeed. Preliminary investigations focused on evaluating mixtures of enzymes in various combinations. The extent of hydrolysis was routinely assayed by measuring the release of sugars and proteins. Further experiments were performed to establish the optimal conditions under which a mixture of enzymes, comprising cellulase, hemicellulase and pectinase, hydrolysed wheatfeed. Studies were also conducted where these enzymes were added sequentially to wheatfeed and useful information was gained on the composition of the susceptible components. Steam explosion was investigated as a pretreatment of wheatfeed to make subsequent enzyme treatment more effective. However, the results were inconclusive. Trials were carried out using commercially available enzymes to compare their effectiveness on the wheatfeed. A cellulase, was selected for further investigation into the effects of particle size, extent of agitation, and enzyme concentration on sugar release. An empirical mathematical model describing the action of this enzyme was developed. Enzyme treatment of wheatfeed was also performed under conditions of reduced water content, or 'solid state'. However, enzyme action was limited, yielding lower quantities of sugars and protein. The treatment of wheatfeed with enzymes was shown to increase digestibility of the substrate. However, the high costs of enzymes would effectively rule this out as a commercial option and alternative methods such as for example a form of composting using cellulolytic fungi might prove more economic

SLSC Seminar Planning Fall Semester 1970-1971

Dr. Addington\u27s handwritten outline for the Sierra Leone Program Fall seminar course, 1970-1971, on the back of copies of the September 23 and September 24 editions of the Daily Data at Otterbein. A transcript of the handwritten schedule is available as a separate file below

SLSC Otterbein College Foreign Study Programs

Descriptions of Otterbein College\u27s different foreign study programs as of the 1969-1970 academic year

SLSC A Study in Comparative Education, Sierra Leone, Africa

Proposal for a grant from the National Endowment for the Humanities to fund the Sierra Leone Foreign Study program for 1971-1972

A Mass Spectrometric Study Of Positive Ions Produced In An Experimental Diode

A simple diode ion source has been developed for direct observation in a mass spectrometer of the positive ions created in an operating diode. The ionic species accelerated toward the cathode were identified. The shape of the peak displayed in the spectrum is related to the region of the diode in which the ions were formed. Variation of experimental parameters, including the composition of the background gases, indicated that the characteristic shapes of the peaks can be related to space charge in the diode. This is complicated by the tendency of some of the species to fragment and further work is indicated before a complete understanding of the relations is obtained. Alkali and halogen ions were observed when an emission current was drawn. These species are assumed to be present as anode impurities. Heavy bombardment of the cathode by alkali ions is associated with an apparent increase in cathode activity. Heating an oxide cathode to temperatures as high as, or higher than, previous processing temperatures led to a further release of CO2 from the cathode. This additional release was not observed with the conventional mass spectrometer ion source thereby indicating that important observations concerning the state of the cathode may be missed when the ions which are analyzed are not created within the operating diode. © 1974