21 research outputs found
SEARCH FOR SLOWLY MOVING MAGNETIC MONOPOLES WITH THE MACRO DETECTOR
A search for slowly moving magnetic monopoles in the cosmic radiation was conducted from October 1989 to November 1991 using the large liquid scintillator detector subsystem of the first supermodule of the MACRO detector at the Gran Sasso underground laboratory. The absence of candidates established an upper limit on the monopole flux of 5.6 x 10(-15) cm-2 sr-1 s-1 at 90% confidence level in the velocity range of 10(-4) less than or similar to beta < 4 x 10(-3). This result places a new constraint on the abundance of monopoles trapped in our solar system
Procedures to characterize and study P2Z/P2X7 purinoceptor: flow cytometry as a promising practical, reliable tool
Holocene development and anthropogenic disturbance of a shallow lake system in Central Ireland recorded by diatoms
Three cores from two connected lakes in Central Ireland (Lough Kinale and Derragh Lough) were investigated using diatom analysis to establish the Holocene development of the lacustrine system, any local variations within the lakes and any anthropogenic influences. The study area was situated in a lowland location and the lakes were shallow, unstratified and interconnected. Litho-and bio-stratigraphical analyses of the lake cores and deposits beneath a mire separating the two lakes showed the changing spatial configuration of the lake system in the early Holocene and the separation of the initial lake into three basins (cf. lacustrine cells) and finally into two interlinked lakes. The evolution of the lake system is conceptualised as the development of distinct lacustrine cells, and its sediments have recorded changes in the physical (geography, depth and sedimentation) and chemical (water chemistry) properties of the lakes inferred through diatom analyses. The longest sequence, from the early Holocene, records fluctuating lake levels and these are correlated with geomorphological mapping and surveying of palaeoshorelines. The diatom assemblages of the upper 2 m of the three cores, covering approximately the last 2000–3000 radiocarbon years show considerable difference in trophic status and life-form categories. This is related to the location of the cores in the lake and also the distance from human settlement with particular reference to proximity to crannog (artificial island) construction and use. The most central core from the deepest part of Lough Kinale has the least representation of the human settlement and agricultural activity in the catchment and on the fringes of the lake, whereas the core taken from the edge of a crannog is able to identify when construction and use of the crannog occurred. The local nature of the palaeoecological response to human activity due to incomplete water mixing has the advantage of allowing the lake sediment cores to be used to determine spatially discrete settlement patterns
Regulation of oxygen radical production of human polymorphonuclear leukocytes by adenosine: the role of calcium
Recovery of nitrogen fertilizer by traditional and improved rice cultivars in the Bhutan Highlands
Adenosine A2A receptor activation reduces recurrence and mortality from Clostridium difficileinfection in mice following vancomycin treatment
Indirect bronchial hyper-responsiveness: the coming of age of a specific group of bronchial challenges
SEARCH FOR STELLAR GRAVITATIONAL COLLAPSE BY MACRO - CHARACTERISTICS AND RESULTS
The first MACRO lower supermodule has been sensitive to antineutrinos from stellar gravitational collapse since spring 1989. The results with the 44 tonnes of liquid scintillator which have been instrumented to search for stellar gravitational collapse are discussed here
Association Between Endothelial Nitric Oxide Synthase (eNOS) −786 T/C and 27-bp VNTR 4b/a Polymorphisms and Preeclampsia Development
Search of strange quark matter using MACRO detector
The MACRO detector is sensitive to wide range of ionizing massive particles in cosmic rays. These include “nuclearites” or strange quark matter. The negative result of a search lasting about 20 months using 1/12 of the detector has yielded a flux limit of 1.1 × 10{−14}cm{−2}sr{−1}s{−1} for strange matter with mass 10{−10}g 0.1g, the limit is 5.5 × 10{−15}cm{−2}sr{−1}s{−1}. Since the velocity range of nuclearites to which MACRO is sensitive extends down to near the escape velocity of the earth, the flux limit not only applies to nuclearites of galactic or extra-galactic origin but also applies to nuclearites that are trapped in the solar system