1,027 research outputs found
Preparation of Short-life Berkelium Tracers by 241Am(α,xn) or 243Am(α,xn) Reactions
開始ページ、終了ページ: 冊子体のページ付
Effects of Herbage Species on the Spatial Heterogeneity of Biomass in Grazed Pasture: Kentucky Bluegrass vs. White Clover
The Hard Life: A Pedagogical Experience in Industrial Design
Thispaperseekstoanalyzeanddiscussaredesignprojectdeveloped by students of master’s degree in industrial design. Based on the book The Hard Life, from English designer Jasper Morrison, the briefing proposed the devel- opment of concepts for new products inspired by the selection of objects in the book, and respective written interpretations. It seeks to explore the dialogue between the original objects – their use, Morrison’s interpretation - and the reinterpretation made by the students considering the current material culture.
Accompanied and coordinated with Bisarro, contemporary studio dedicated to the artisan production of small series in Bisalhães black clay, UNESCO Immaterial Cultural Heritage, the project seeks to explore the boundaries and common ground between memory and contemporary times.
More than the results, it is intended to discuss proposals and approaches, from functional interpretations, formal inspiration, to the appropriation of affordance and gesture.info:eu-repo/semantics/publishedVersio
Characterization of the QUartz Photon Intensifying Detector (QUPID) for Noble Liquid Detectors
Dark Matter and Double Beta Decay experiments require extremely low
radioactivity within the detector materials. For this purpose, the University
of California, Los Angeles and Hamamatsu Photonics have developed the QUartz
Photon Intensifying Detector (QUPID), an ultra-low background photodetector
based on the Hybrid Avalanche Photo Diode (HAPD) and entirely made of
ultraclean synthetic fused silica. In this work we present the basic concept of
the QUPID and the testing measurements on QUPIDs from the first production
line. Screening of radioactivity at the Gator facility in the Laboratori
Nazionali del Gran Sasso has shown that the QUPIDs safely fulfill the low
radioactive contamination requirements for the next generation zero background
experiments set by Monte Carlo simulations. The quantum efficiency of the QUPID
at room temperature is > 30% at the xenon scintillation wavelength. At low
temperatures, the QUPID shows a leakage current less than 1 nA and a global
gain of 10^5. In these conditions, the photocathode and the anode show > 95%
linearity up to 1 uA for the cathode and 3 mA for the anode. The photocathode
and collection efficiency are uniform to 80% over the entire surface. In
parallel with single photon counting capabilities, the QUPIDs have a good
timing response: 1.8 +/- 0.1 ns rise time, 2.5 +/- 0.2 ns fall time, 4.20 +/-
0.05 ns pulse width, and 160 +/- 30 ps transit time spread. The QUPIDs have
also been tested in a liquid xenon environment, and scintillation light from
57Co and 210Po radioactive sources were observed.Comment: 15 pages, 22 figure
Factors affecting milk cortisol in mid lactating dairy cows
Background: Whether the measurement of cortisol in dairy cows can be used as a biomarker of adverse
environmental or pathophysiological conditions is still under of scientific debate. In these situations, several systems
mainly the hypothalamic-pituitary-adrenal axis, the autonomic nervous system, and the immune system are
recruited to reestablish homeostasis. A first aim of the present study was to compare milk and blood cortisol
concentrations and to consider its variability in milk in relation to farm, milk yield and days in milk. A second study
investigates the effects of breed, class of somatic cell count (SCC) and farm on milk cortisol levels in a larger
number of cows and farms, with the aim to validate the results obtained in the pilot study.
Methods: For study 1, 135 cows were sampled from 2 Italian Simmental and 2 Italian Holstein commercial farms,
whilst in the second study, 542 cows were sampled from 6 commercial farms of Italian Simmental and 499 cows
from 4 commercial farms of Italian Holstein.
Results: In study 1, the values of cortisol content in milk were significantly higher in Holstein than Simmental cows.
Significant differences between farms were observed for milk and plasma cortisol concentrations. Cortisol content
in milk was not correlated to plasma content in study 1 and the mean milk to plasma cortisol ratio was about 1:30.
In study 2, for Holstein cows, significantly higher values of milk cortisol in comparison to Simmental cows was
reported. A significant effect of class of SCC was observed, cows belonging to class 3 (SCC higher than 400.000/ml)
showed the highest mean values of milk cortisol. The farm effect was significant also in the study 2, confirming the
results obtained in the first study.
Conclusions: Milk can be considered a preferential site of sampling in dairy cows to point out short term
stimulation of the hypothalamic-pituitary-adrenal axis. Further studies are needed to investigate the physiological
basis of the relationship between milk cortisol content and bree
PROLIFIRATION RESISTANT FUEL CYCLE SYSTEM FOR THE TRANSITION FROM LIGHT WATER REACTOR TO FAST REACTOR
PACSWIN: A new international ocean climate program in the Indonesian seas and adjacent regions
Reconstituted Ion Channels of Frog Fungiform Papilla Cell Membrane.
We identified a Cl^- channel, two K^+ channels and a cAMP-gated channel which were isolated from bullfrog fungiform papilla cell membranes and incorporated into phospholipid bilayers using the tip-dip method. The 156 pS channels were inhibited by 100μM 4, 4\u27-diisothiocyanostilbene-2, 2\u27-disulfonic acid (DIDS) and displayed the reversal potential identical to the equilibrium potential of Cl^-, it was identified as a Cl^- channel. Two types of K^+ channel had unitary conductances of 79 and 43 pS, which may correspond to those of Ca^-activated and cAMP-blockable K^+ channels observed in isolated intact frog taste cell membranes, respectively. These results suggest that the tip-dip method is useful for stable investigation of the properties of ion channels already identified in the taste cell. Furthermore, the 23 pS channels were newly found and were activated directly by internal cAMP as cyclic nucleotide-gated (CNG) nonselective cation channels established in olfactory receptor cells. Thus, our results suggest the possibility that besides Cl^- and K^+ channels, the cAMP-gated channels contribute to taste transduction
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