The relationship of extensional and compressional tectonics to a Precambrian fracture system in the eastern overthrust belt, USA

The central and southern Appalachians have a long history of interrelated extensional and compressional tectonics. It is proposed that each episode was controlled by a reactivation of a fracture system in the Precambrian basement. Proprietary seismic-reflection profiles show a system of down-to-the-east Precambrian extensional faults. When under renewed extension, these faults produce features such as the western border faults of Mesozoic basins, and when under compression, probably produce tectonic ramps in the overlying sedimentary cover rocks as well as the spatially and genetically related Alleghenian folds. This system, which parallels the Appalachian trend, is cut by a system of cross-strike hinge or scissors faults that have probable strike-slip movements. Reactivation of this cross-strike system appears to have produced lateral ramps that connect decollements at different stratigraphic levels and caused abrupt changes in fold wavelength along strikes. Continued reactivation of this cross-strike system is suggested by east-west border faults and Precambrian highs between Mesozoic basins. The present activity of this system is suggested by the fact that more than 35% of recent earthquakes are coincident with cross-strike faults and lateral ramps

A photogeologic comparison of Skylab and LANDSAT images of southwestern Nevada and southeastern California

There are no author-identified significant results in this report

Astrogeology 13 - Lunar crater morphology and relative age determination of lunar geologic units Interagency report

Lunar crater morphology and age classification syste

Exposures and exposure hedging in exchange rate risk management

Corporations are affected by increasing volatilities on foreign exchange markets. A response to this development was the creation of financial instruments, so called derivatives, in order to protect corporations from the effects of flexible exchange rates. To understand the included risks and to take correct decisions it is necessary to get a fundamental insight into exchange rate risk management. First it is the aim of this paper to systemize the possibilities of determining exchange rate risk as well as objectives of exchange rate risk management. In the second part of the paper a model to determine the optimal hedge ratio in the case of hedging transaction risks with forwards is described. --Currency Risk,Transaction Risk,Currency Forwards,Optimal Hedging

Exposures and exposure hedging in exchange rate risk management

Corporations are affected by increasing volatilities on foreign exchange markets. A response to this development was the creation of financial instruments, so called derivatives, in order to protect corporations from the effects of flexible exchange rates. To understand the included risks and to take correct decisions it is necessary to get a fundamental insight into exchange rate risk management. First it is the aim of this paper to systemize the possibilities of determining exchange rate risk as well as objectives of exchange rate risk management. In the second part of the paper a model to determine the optimal hedge ratio in the case of hedging transaction risks with forwards is described

A fehérje triptofán enantiomereinek meghatározása = Determination of the tryptophan enantiomers of the protein

A kutatás során megvalósítottuk a Trp-enantiomerek elválasztását a fehérjékben előforduló egyéb aminosavaktól 1-tio-béta-D-glükóz-tetraacetáttal és o-ftálaldehiddel képzett diasztereoizomerek formájában. Megvizsgáltuk a legnagyobb kitermeléssel járó savas fehérjehidrolízis-módszereket a Trp-enantiomerek meghatározása szempontjából. Merkapto-etán-szulfonsav jelenlétében nem megy végbe a származékképzési reakció, a MES-felesleg megkötését, eltávolítását csak nagyon nehezen lehet megoldani. A p-toluol-szulfonsavas módszert vizsgáltuk önmagában, ill. triptamin és 3-indol-propionsav védőreagens jelenlétében. PTS jelenléte a származékképzést nem zavarta, azonban csupán PTS-at alkalmazva hidrolizáló reagensként a Trp visszanyerése nagyon alacsony. Amennyiben triptamint is adunk a rendszerhez a hidrolízis során a Trp indolgyűrűjének megvédése érdekében, a származékképzéskor csapadék képződött, így az elválsztást HPLC-vel nem tudtuk megvalósítani. 3-indol-propionsavat alkalmazva védőreagensként a származékképzés lejátszódott, a triptofán visszanyerése 75% felettinek adódott. A fentieken túl vizsgáltuk a Trp racemizációját szabad formában és fehérjében kötve modelloldatokkal, valamint különböző ideig sütött húsokban, illetve lúgosan kezelt vágóhídi hulladékokban. | During the research we accomplished the separation of the enantiomers of Trp from the other protein amino acids, in the form of diastereoisomers formed with 1-thio-beta-D-glucose tetra acetate and o-phtaldialdehyde. We examined the acidic protein hydrolysis methods providing the highest recovery in respect of determination of Trp enantiomers. In the presence of 2-mercaptoethane sulfonic acid (MESA) no derivatization takes place, the excess of MESA can be eliminated with much difficulty only. The p-toluenesulfonic acidic (pTSA) method was examined without using a protecting agent, and in the presence of protecting agents tryptamine and 3-indolyl propionic acid, respectively. The presence of pTSA does not disturb the derivatization, however, if solely pTSA is used as hydrolyzing agent, the recovery of Trp is very low. If also tryptamine was added in order to protect the indole group of Trp during the hydrolysis, precipitation occurred during the derivatization, so the separation was not possible by HPLC. If 3-indolyl propionic acid is applied as protecting agent, the derivatization takes place with a recovery above 75% for Trp. Beyond the above, we also examined racemization of free and protein-bound Trp with model solutions, as well as in meats fried for different durations, and in alkaline treated slaughterhouse waste material, respectively