36 research outputs found
Evolution and environment of the eastern linear pottery culture: A case study in the site of Polgár-Piócási-Dűlő
A salvage excavation preceding a major investment project was conducted in 2006–2007, during which associated settlement features of a Middle Neolithic, Eastern Linear Pottery Culture (Alföld Linearbandkeramik – ALBK) were uncovered in an area called Piócási-dűlő on the eastern outskirts of Polgár. The features of the ALBK settlement date from two periods. The cluster of multi-functional pits yielding a rich assortment of finds, the handful of post-holes and an unusual ritual well found in the southern part of the investigated area formed one unit from the earliest phase of the Middle Neolithic (ALBK I). The settlement’s other occupation can be assigned to the late phase of the Middle Neolithic (ALBK IV). Five houseplans representing the remains of timber-framed buildings outlined a distinct area with three multi-functional pits. Associated with the above features were 8 burials.
The preliminary archaeobotanical results from Polgár–Piócási-dűlő are based on the plant material found within the sediments of 11 archaeological structures, which mainly represent pits and a welI. It can be stated that the natural environment offered habitats in which oak trees dominated in the local vegetation, forming floodplain forests and wooded steppes. They also provided food in the form of fruits and formed an optimal habitat for domestic animals. Arable fields were probably also established in the vicinity of the settlements, suggested by findings of macroscopic plant remains that represented cultivated species.
In both settlement phases lithic production activities are manifested both by the local on-site lithic production and – most importantly – by the presence of imported, mainly mesolocal, raw materials that point to contacts with deposit areas, or off-site preliminary working of obsidian and limnoquartzites. The kit of harvesting tools and a large number of grinding stones – especially in the younger phase – for the preparation of plant food suggest a major role of plant cultivation
Measurement of the diffractive structure function in deep inelastic scattering at HERA
This paper presents an analysis of the inclusive properties of diffractive
deep inelastic scattering events produced in interactions at HERA. The
events are characterised by a rapidity gap between the outgoing proton system
and the remaining hadronic system. Inclusive distributions are presented and
compared with Monte Carlo models for diffractive processes. The data are
consistent with models where the pomeron structure function has a hard and a
soft contribution. The diffractive structure function is measured as a function
of \xpom, the momentum fraction lost by the proton, of , the momentum
fraction of the struck quark with respect to \xpom, and of . The \xpom
dependence is consistent with the form \xpoma where
in all bins of and
. In the measured range, the diffractive structure function
approximately scales with at fixed . In an Ingelman-Schlein type
model, where commonly used pomeron flux factor normalisations are assumed, it
is found that the quarks within the pomeron do not saturate the momentum sum
rule.Comment: 36 pages, latex, 11 figures appended as uuencoded fil
Comparison of Water Stress and uv Radiation Effects on Induction of Cam and Antioxidative Defense in the Succulent Rosularia Elymaitica (Crassulaceae)
Growth and photosynthetic characteristics, inducibility of the CAM pathway and the functioning of the antioxidant
defense system were investigated in Rosularia elymaitica (Crassulaceae) under drought and UV stresses.
Drought did not substantially affect the growth of the plants, but it significantly reduced leaf thickness as well
as osmotic potential, water potential and relative water content. In contrast, UV radiation treatment affected neither
growth nor the water relations of leaves. Water limitation for 12 days caused a significant increase in nighttime
PEPC and NAD-MDH activity and an increase in Δtitratable acidity relative to well-watered plants. The nighttime
CO2 net assimilation rate increased significantly in drought-stressed plants but was still negative, resembling
a C3-like pattern of gas exchange. Twenty days of UV treatment, increased Δtitratable acidity slightly and
increased only daytime PEPC activity, and did not affect other parameters of carbon metabolism. As judged by
maintenance of membrane integrity and stable amounts of H2O2 under UV stress, the antioxidant defense system
effectively protected the plants against UV radiation. In contrast, oxidative stress occurred under severe
drought stress (20 days of withholding water). Except for higher daytime APX activity in the UV-treated plants,
enzyme activity in the control and in the drought- and UV-stressed plants did not show any diurnal fluctuation
during 24 h. Temporal changes in Δtitratable acidity and ΔPEPC activity coincided closely with those of antioxidant
enzymes; both started to increase after 12 days of drought stress. These results indicate that drought stress
but not UV radiation induced the CAM-cycling pathway in R. elymaitica