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The Effects of Pulp and Paper Mill Wastewaters on Phytoplankton Primary Productivity in the Red River, Louisiana (open access)

The Effects of Pulp and Paper Mill Wastewaters on Phytoplankton Primary Productivity in the Red River, Louisiana

Responses of phytoplankton productivity in the Red River to unbleached pulp and paper mill wastewaters were monitored using in situ ^14C incubation. Preoperational studies, conducted prior to the discharge of mill wastewaters varied seasonally, but revealed similar productivity trends when compared with postoperational studies, conducted after mill discharges began entering the Red River. Carbon assimilation rates measured downstream of mill discharge were generally greater than upstream levels in both preoperational and postoperational studies. Selected physical, chemical, and biological parameters varied seasonally, but showed similar upstream-downstream values and preoperational-postoperational values. Total Organic Carbon (TOC), Dissolved Organic Carbon (DOC), and Biochemical Oxygen Demand (BOD_5) were positively correlated with postoperational productivity rates. Apparent color was negatively correlated with productivity rates.
Date: May 1984
Creator: Holler, Jeffrey Dee
System: The UNT Digital Library
Effects of Suspended Solids on Bioavailability of Chemicals to Daphnia magna and Pimephales promelas (open access)

Effects of Suspended Solids on Bioavailability of Chemicals to Daphnia magna and Pimephales promelas

Three suspended solids types containing a range of physicochemical characteristics were used to determine the effect of suspended solids on the bioavailability of acenaphthene, 1,2,4,5-tetrachlorobenzene, zinc, and chlordane to Daphnia magna and Pimephales promelas. Generally, the bioavailability of zinc and chlordane decreased due to interactions with all suspended solids types while bioavailability of acenaphthene and 1,2,4,5-tetrachlorobenzene were not clearly reduced. Partition coefficients and slope of dose-response curves related chemical characteristics and organism sensitivity, respectively, to experimentally determined results. It is believed that the biologically available form of these chemicals to Daphnia magna and Pimephales promelas resides in the aqueous phase.
Date: December 1984
Creator: Hall, W. Scott (Warren Scott)
System: The UNT Digital Library
The Denton Mare (open access)

The Denton Mare

Some men are born to greatness, others to great tragedy. This novel is a fictional account of one of those men: the notorious Texas outlaw, Sam Bass. Set in the Old West of the 1870s, the story primarily concerns itself with events in the train robber's life from the time he owned and raced the Denton Mare to the now famous shoot-out in Round Rock, Texas. It is a story of crime and betrayal told through the eyes of Bass and one of his close confederates, Jim Murphy.
Date: December 1984
Creator: DeMello, Duane T. (Duane Tyler)
System: The UNT Digital Library