Pawel Majewski

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Most of text categorization research exploit bag-of-words text representation. However, such representation makes it very hard to capture semantic similarity between text documents that share very little or even no vocabulary. In this paper we present preliminary results obtained with a novel approach that combines well established kernel text classifiers(More)
  • D Yu Akimov, H M Araújo, E J Barnes, V A Belov, A Bewick, A A Burenkov +32 others
  • 2012
a r t i c l e i n f o a b s t r a c t We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at the Boulby Underground Laboratory. A raw fiducial exposure of 1344 kg·days was accrued over 319 days of continuous operation between June 2010 and May 2011. A total of eight events was(More)
Previously, we have demonstrated that the timing of the nocturnal peak of activity of the pineal arylalkylamine-N-acetyltransferase - a key enzyme in the melatonin biosynthesis pathway - in 3-wk-old chickens kept from the day of hatch under controlled laboratory conditions (L:D 12:12) varies depending on the season of hatch (summer vs. winter). The present(More)
—A dual-phase xenon chamber was tested to measure the yield of electrons extracted from the liquid to the gas and their subsequent amplification via proportional light. The light yield was studied as a function of electric field and gas pressure. A UV-sensitive compact metal channel photomultiplier tube, placed in the gas above the liquid xenon, was used(More)
The avian pineal gland, apart from the hypothalamic master clock (suprachiasmatic nuclei, SCN) and retina, functions as an independent circadian oscillator, receiving external photic cues that it translates into the rhythmical synthesis of melatonin, a biochemical signal of darkness. Functional similarity to the mammalian SCN makes the avian pineal gland a(More)
—We have used newly developed metal-channel pho-tomultipliers (PMTs) from Hamamatsu Photonics to detect the fast scintillation light from liquid xenon. The PMTs are designed to operate within the liquid and to efficiently detect the 175 nm Xe light. Their small transit time spread makes them ideal for fast timing applications. To evaluate the timing(More)
OBJECTIVES Siberian hamsters are photoperiodic animals exhibiting seasonality of reproduction and other physiological functions. Thus, the influence of photoperiod on the in vitro activity of selected immune cells from male and female hamsters challenged with peritoneal inflammation was examined. METHODS Animals were housed for 8-10 weeks in LD (L:D=18:6)(More)
Neutrophil extracellular traps (NETs), DNA webs released into the extracellular environment by activated neutrophils, are thought to play a key role in the entrapment and eradication of microbes. However, NETs are highly cytotoxic and a likely source of autoantigens, suggesting that NET release is tightly regulated. NET formation involves the activity of(More)
Previously, we have demonstrated the postembryonic development of chicken (Gallus gallus domesticus L.) pineal gland functions expressed as changes in melatonin (MEL) biosynthesis. Pineal concentrations of MEL and its precursor serotonin (5-HT) were shown to increase between the 2nd and 16th day of life. We also found that levels of the mRNAs encoding the(More)