"Depolarization-dependent calcium influx is biphasic in synaptosomes (Nachshen and Blaustein, 1980, 1982). The fast and slow components of 45 Ca++ influx are proposed to occur through separate calcium channels. In this report the fast and slow components of depolarization-dependent 45Ca++ influx are resolved. The fast component is inactivated by predepolarization, inhibited by low concentrations of lanthanum and closely correlates with the rapid release of 3H-norepinephrine from synaptosomes. The properties of the fast component of influx suggest that it is mediated by calcium channels which inactivate during the first second of depolarization. The slow component is not sensitive of predepolarization and is partially dependent on the internal Na+ content of the synaptosomes. It is proposed that during depolarization a portion of the slow component of Ca++ influx in synaptosomes is mediated by a Na i/Cao exchange mechanism."
This dissertation is an empirical study of alternative strategies for hedging the interest rate risk of GNMAs. Four hedging strategies are considered: (1) the short sale of Treasury note futures, (2) the short sale of Treasury bond futures, (3) the simultaneous short sale of Treasury bond futures and Eurodollar certificate of deposit futures, and (4) the purchase of put options on Treasury bond futures. Each of these strategies is evaluated in simulations constructed with daily price series for seven different GNMA coupons covering the period from January 1985 to March 1987. Hedge ratios were computed using modified Macaulay duration and six different models of GNMA price sensitivity.
"Penumbral Zone Residua of Past Impressions is intended for a large string orchestra, the ideal balance consisting of 24 violins, 18 violas, 18 'cellos, and 12 basses, each divided into 6 sections. It is in one continuous movement, but with several strongly constrasting sections. The beginning and ending sections change meter often, keeping a common eighth-note pulse, except where otherwise indicated. In two passages, mm. 352--389 and 398--445, I have called for the use of two contrasting meters, related by a ratio of 3:2, to be used simultaneously."
Slaty cleavage exposed in the fine-grained metasediments of western Ocoee Gorge, Tennessee is characterized by zones enriched in cleavage-parrallel white mica (P domains), alternating with zones enriched in quartz and feldspar and in which phyllosilicates are bedding-parallel (Q domains). This domainal fabric appears to develop by growth of new mica from mica components carried in a moving fluid. Solid state recrystallization of clays and mica may also have contributed to the development of the fabric, but little, if any, mechanical rotation or passive concentration of mica grains occurred. Both P domain morphology and mineralogical differences between P and Q domain phyllosilicate populations suggest that nucleation and growth of P domains may involve the expulsion of fluids, during diagenesis and low-grade metamorphism.
Roots of white ash have a better configuration than roots of sugar maple for anchoring shallow colluvium against landsliding on hillslopes along the Ohio River and its tributaries in southwestern Ohio. The landslides are in a shallow layer of colluvium, about one meter thick, overlying shale and limestone bedrock. The sliding hillsides range in slope angle from 16 to 36 degrees and the roots which penetrate shear surfaces are anchored in the weathered bedrock and help to hold landmasses in place. The hillsides are covered by a mesophytic forest, locally known as a ravine community, dominated by white ash, sugar maple and sweet buckeye. Sugar maple is the most common species on the landslides; its roots do not penetrate the soil as deeply as the roots of the white ash.
A stratigraphic and paleontological analysis of 303 samples of Paleocene sediments of the eastern Gulf Coastal Plain of Mississippi, Alabama, and Georgia provided the basis for a geochronologic, quantitative paleoecologic, and paleoceanographic model.
The present work is a stratigraphic, reservoir, and environmental analysis of the Itarare Group (Permo-Carboniferous) using the well data of the Parana Basin which covers about 1,000,000 Km$\sp{2}$ in Brazil alone. More than three thousand kilometers of cross sections were analysed, over 100 wells were studied, nearly 400 meters of cores were described, and 95 thin sections were analysed.
"The Molango manganese deposit is the only known large Mn deposit in North America. Mineralization involves Mn-carbonate exclusively in a finely laminated bed about 10 meters thick with a strike length $>$50 kilometers. The ore bed is the basal unit of the Chipoco facies (Taman Fm., Kimmeridgian) and underlain by laminated black shales of the Santiago formation (Oxfordian)."