Search

An existing hydrologic model has been altered to allow simulations and predictions of suspended sediment and bound ion loadings. Application to synthetic and actual data bases illustrates the model's usefulness.

A study was conducted to assess the effects of an oil spill on the macroinvertebrate populations in a small creek in Virginia. Sediments were extracted with hexane, and the residue concentrations were correlated with the numbers and diversities of macroinvertebrates collected downstream of the spill. Based on the available data, it was concluded that the effect of the oil spill was a toxic one rather than one of rendering the sediments unsuitable for colonization.

This bibliography attempts to list all known theses on sub-Saharan Africa accepted by the University of California at Berkeley, and catalogued by the University Library through January, 1969. The earliest item is dated 1914. The list was compiled from a card file of theses arranged by academic department which is maintained by the Library's General Reference Service.The availability of theses on interlibrary loan is indicated by symbols following the number of leaves (L) in the thesis. An asterisk indicates that the Library has catalogued more than one copy of a title, and that the second copy may be borrowed on interlibrary loan. The symbol # indicates that the Library's Graduate Social Science branch has an uncatalogued copy of the thesis which may be borrowed. Absence of these symbols indicates that the title is not available on interlibrary loan. Photocopies of all M.A. and those Ph.D. these completed before September, 1962 may be purchased from the Library's Photographic Service; those Ph.D. theses from September, 1962 on, from University Microfilms, Inc.The bibliography is in two parts. The first part contains those items which cover more than one country, and is divided into General, Central Africa, East Africa, and West Africa; the second part, arranged by country (present name), lists those titles dealing with only one political unit.

The minimal lethal concentration of ozone in water was determined for three bacterial species: Escherichia coli, Bacillus cereus, and Bacillus megaterium. A contact period of 5 min was selected. The lethal threshold concentration for the cells of B. cereuswas 0.12 mg/liter while that for E. coliand B. megateriumwas 0.19 mg/liter. Low concentrations of ozone were ineffective when organic matter was present to interfere with the action of ozone on the bacterial cells. Also determined during the study was the sensitivity of spores of B. cereusand B. megateriumto ozone in water. The threshold concentration required to kill the spores of both species was 2.29 mg/liter. The cells and spores of these organisms exhibited the “all-or-none” die-away phenomenon normally associated with ozone treatment.