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See detailPeriod 2 regulates neural stem/progenitor cell proliferation in the adult hippocampus.
Borgs, Laurence ULg; Beukelaers, Pierre ULg; Vandenbosch, Renaud ULg et al

in BMC Neuroscience (2009), 10

BACKGROUND: Newborn granule neurons are generated from proliferating neural stem/progenitor cells and integrated into mature synaptic networks in the adult dentate gyrus of the hippocampus. Since light ... [more ▼]

BACKGROUND: Newborn granule neurons are generated from proliferating neural stem/progenitor cells and integrated into mature synaptic networks in the adult dentate gyrus of the hippocampus. Since light/dark variations of the mitotic index and DNA synthesis occur in many tissues, we wanted to unravel the role of the clock-controlled Period2 gene (mPer2) in timing cell cycle kinetics and neurogenesis in the adult DG. RESULTS: In contrast to the suprachiasmatic nucleus, we observed a non-rhythmic constitutive expression of mPER2 in the dentate gyrus. We provide evidence that mPER2 is expressed in proliferating neural stem/progenitor cells (NPCs) and persists in early post-mitotic and mature newborn neurons from the adult DG. In vitro and in vivo analysis of a mouse line mutant in the mPer2 gene (Per2Brdm1), revealed a higher density of dividing NPCs together with an increased number of immature newborn neurons populating the DG. However, we showed that the lack of mPer2 does not change the total amount of mature adult-generated hippocampal neurons, because of a compensatory increase in neuronal cell death. CONCLUSION: Taken together, these data demonstrated a functional link between the constitutive expression of mPER2 and the intrinsic control of neural stem/progenitor cells proliferation, cell death and neurogenesis in the dentate gyrus of adult mice. [less ▲]

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See detailA period and a prediction for the Of ? p spectrum alternator HD 191612
Walborn, Nolan R.; Howarth, Ian D.; Rauw, Grégor ULg et al

in Astrophysical Journal (2004), 617(1, Part 2), 61-64

The observational picture of the enigmatic O-type spectrum variable HD 191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 days has recently been ... [more ▼]

The observational picture of the enigmatic O-type spectrum variable HD 191612 has been sharpened substantially. A symmetrical, low-amplitude light curve with a period near 540 days has recently been reported from Hipparcos photometry. This period satisfies all of the spectroscopy since at least 1982, including extensive new observations during 2003 and 2004, and it has predicted the next transition during 2004 September - October. Measurements of the Ha equivalent width reveal a sharp emission peak in the phase diagram, in contrast to the apparently sinusoidal light curve. The He II absorption-line strength is essentially constant, while He I varies strongly, possibly filled in by emission in the O6 state, thus producing the apparent spectral type variations. The O8 state appears to be the "normal" one. Two intermediate O7 observations have been obtained, which fall at the expected phases, but these are the only modern observations of the transitions so far. The period is too long for rotation or pulsation; although there is no direct evidence as yet for a companion, a model in which tidally induced oscillations drive an enhanced wind near periastron of an eccentric orbit appears promising. Further observations during the now predictable transitions may provide a critical test. Ultraviolet and X-ray observations during both states will likely also prove illuminating. [less ▲]

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See detailPeriod and Spectroscopic Orbit of TU Hor
Duerbeck, H. W.; Surdej, Anna ULg; Surdej, Jean ULg

in Astronomy and Astrophysics. Supplement Series (1979), 36

Abstract image available at: http://esoads.eso.org/abs/1979A&AS...36..283D

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See detailPeriod doubling as a means of representing multiply instantiated entities
Sougné, Jacques ULg

in Gernsbacher, Morton Ann; Derry, Sharon J. (Eds.) Proceedings of the Twentieth Annual Conference of the Cognitive Science Society (1998)

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See detailPeriod of the Si-star in NGC 2169
Renson, Pierre ULg

in Astronomy and Astrophysics (1994), 285

For the Si Ap-star known in NGC 2169 (Gr.9 in the cluster), a period between 0.60 and 0.62 d, most likely about 0.606 d, agrees with all known observations, and is much more probable than the period 1.56 ... [more ▼]

For the Si Ap-star known in NGC 2169 (Gr.9 in the cluster), a period between 0.60 and 0.62 d, most likely about 0.606 d, agrees with all known observations, and is much more probable than the period 1.56 d proposed by Maitzen & Lebzelter (1993). The obtained period is among the shortest ones known for Ap stars. [less ▲]

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See detailThe Period of the Spectroscopic Binary and Magnetic Star HD 8441
Renson, Pierre ULg

in Information Bulletin on Variable Stars (1965), 108

Not Available

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See detailA PERIOD3 polymorphism predicts fMRI assessed brain responses following sleep loss
Vandewalle, Gilles ULg; Archer, Simon; Wuillaume, Catherine et al

in Sleep (2008), 31(Suppl. 1),

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See detailA PERIOD3 polymorphism predicts fMRI assessed brain responses following sleep loss
Vandewalle, Gilles ULg; Archer, SN; Wuillaume, C et al

Conference (2008, June)

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See detailPériode de HR 8861
Renson, Pierre ULg

in Bulletin de la Société Royale des Sciences de Liège (1965), 34

Not Available

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See detailLa période de HR 8861 = ET And
Renson, Pierre ULg

in Astronomy and Astrophysics (1977), 54

Abstract image available at: http://adsabs.harvard.edu/abs/1977A&A....54..277R

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See detailPériode de l'étoile Ap à grande variation photométrique GC 17353
Renson, Pierre ULg

in Astronomy and Astrophysics (1978), 69

Abstract image available at: http://adsabs.harvard.edu/abs/1978A&A....69..351R

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See detailLa période de tarissement chez la vache laitière
Beckers, Yves ULg

Conference given outside the academic context (2010)

Présentation des éléments historiques et actuels intervenant dans le choix de la durée des périodes tarissement et de lactation chez la vache laitière. Informations sur l'usage de rations acidifiantes en ... [more ▼]

Présentation des éléments historiques et actuels intervenant dans le choix de la durée des périodes tarissement et de lactation chez la vache laitière. Informations sur l'usage de rations acidifiantes en prévention de l'hypocalcémie de lait. [less ▲]

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See detailLa période Halaf
Tunca, Önhan ULg; Molist, M.

Book (2004)

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See detailPériode photométriqe de l'étoile Ap HR 3831
Renson, Pierre ULg; Manfroid, Jean ULg; Heck, A. et al

in Astronomy and Astrophysics (1984), 131

From 32 observations made in February 1977, in the uvby system, a photometric period P = 1.428 + or - 0.005 day was previously found for the A7p SrCrEu star HR 3831 = HD 83368. A series of 26 measurements ... [more ▼]

From 32 observations made in February 1977, in the uvby system, a photometric period P = 1.428 + or - 0.005 day was previously found for the A7p SrCrEu star HR 3831 = HD 83368. A series of 26 measurements in December 1975, a few measurements in December 1978, both also in the Stromgren system, and the measurements recently published by Kurtz (1982) in B and V (Johnson system) improve the precision on P. The value obtained is P = 1.42602 + or - 0.00006 day. The photometric variations with this period are displayed. As found previously, a null-wavelength appears in the blue. Kurtz's suggestion that the photometric period is equal to twice the value above does not seem to be justified; however, other considerations favor a rotation period equal to twice the photometric one. [less ▲]

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See detailLes périodes du Paléolithique supérieur
Flas, Damien ULg

in Toussaint, Michel; Pirson, Stéphane (Eds.) Le patrimoine archéologique de Wallonie. Les chasseurs-cueilleurs du Paléolithique et du Mésolithique (2014)

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See detailPeriodic bursts of non-Io DAM and its relationship to Jovian aurora phenomena
Rucker, H.; Panchenko, M.; Grodent, Denis ULg et al

Poster (2011)

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See detailPeriodic Comet d'Arrest (1976e)
Debehogne, H.; Surdej, Jean ULg; Surdej, Anna ULg et al

in International Astronomical Union Circulars [=IAUCs] (1976), 3010

IAUC 3010 available at Central Bureau for Astronomical Telegrams.

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See detailPeriodic Comet d'Arrest (1976e)
Jekabsons, C.; Jekabsons, P.; Candy, M. P. et al

in International Astronomical Union Circulars [=IAUCs] (1976), 2990

IAUC 2990 available at Central Bureau for Astronomical Telegrams.

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See detailPeriodic leg movements during sleep and wakefulness in narcolepsy.
Dauvilliers, Yves; Pennestri, Marie-Helene; Petit, Dominique ULg et al

in Journal of Sleep Research (2007), 16(3), 333-9

The objectives of the study were to measure the prevalence of periodic leg movements during NREM and REM sleep (PLMS) and while awake (PLMW) and to assess the impact of PLMS on nocturnal sleep and daytime ... [more ▼]

The objectives of the study were to measure the prevalence of periodic leg movements during NREM and REM sleep (PLMS) and while awake (PLMW) and to assess the impact of PLMS on nocturnal sleep and daytime functioning in patients with narcolepsy. One hundred and sixty-nine patients with narcolepsy and 116 normal controls matched for age and gender were included. Narcoleptics with high and low PLMS indices were compared to assess the impact of PLMS on sleep and Multiple Sleep Latency Test (MSLT) variables. More narcoleptics than controls had a PLMS index greater than 5 per hour of sleep (67% versus 37%) and an index greater than 10 (53% versus 21%). PLMS indices were higher both in NREM and REM sleep in narcoleptic patients, but the between-group difference was greater for REM sleep. A significant increase of PLMS index was also found with aging in both narcoleptic patients and controls. PLMW indices were also significantly higher in narcoleptic patients. Patients with an elevated index of PLMS had a higher percentage of stage 1 sleep, a lower percentage of REM sleep, a lower REM efficiency and a shorter MSLT latency. The present study demonstrates a high frequency of PLMS and PLMW in narcolepsy, an association between the presence of PLMS and measures of REM sleep and daytime functioning disruption. These results suggest that PLMS represent an intrinsic feature of narcolepsy. [less ▲]

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