Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailLower and Middle Devonian miospore-based stratigraphy in Libya and its relation to the megafloras and faunas
Streel, Maurice ULg; Fairon-Demaret, Muriel ULg; Gerrienne, Philippe ULg et al

in Review of Palaeobotany and Palynology (1990), 66(3), 229--242

Detailed reference viewed: 20 (7 ULg)
Full Text
See detailLower Carboniferous corals from the Zonguldak Area (Black Sea, Northwestern Turkey).
Denayer, Julien ULg

in Gerrienne, Philippe; Petus, Elodie; Steemans, Philippe (Eds.) Miscelanea palaeontologica (2009, December 04)

Detailed reference viewed: 35 (5 ULg)
Full Text
Peer Reviewed
See detailLower Carboniferous Rugose corals from the Arabian Plate: an insight from the Hakkari area (SE Turkey)
Denayer, Julien ULg; Hoşgör

in Journal of Asian Earth Sciences (2014), 79(1), 345-357

Detailed reference viewed: 32 (3 ULg)
See detailLower Carboniferous Rugose corals from the Zonguldak area (Northwestern Turkey)
Denayer, Julien ULg

in Aldridge, R.; Harper, D. (Eds.) Abstracts volume of the Third International Palaeontological Congress (IPC3) (2010)

Detailed reference viewed: 22 (3 ULg)
Full Text
Peer Reviewed
See detailLower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap
Abdel-Hafiez, M.; Pereira, P.J.; Kuzmichev, S.A. et al

in Physical Review. B : Condensed Matter (2014), 90

Using two experimental techniques, we studied single crystals of the 122-FeAs family with almost the same critical temperature, Tc. We investigated the temperature dependence of the lower critical field ... [more ▼]

Using two experimental techniques, we studied single crystals of the 122-FeAs family with almost the same critical temperature, Tc. We investigated the temperature dependence of the lower critical field Hc1(T) of a Ca0.32Na0.68Fe2As2 (Tc ≈ 34 K) single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the London penetration depth can be described equally well either by a single anisotropic s-wave-like gap or by a two-gap model, while a d-wave approach cannot be used to fit the London penetration depth data. Intrinsic multiple Andreev reflection effect spectroscopy was used to detect bulk gap values in single crystals of the intimate compound Ba0.65K0.35Fe2As2, with the same Tc. We estimated the range of the large gap value L = 6–8 meV (depending on small variation of Tc) and its a k space anisotropy of about 30%, and the small gap Delta ≈ 1.7 ± 0.3 meV. This clearly indicates that the gap structure of our investigated systems more likely corresponds to a nodeless s-wave two gaps. [less ▲]

Detailed reference viewed: 14 (1 ULg)
See detailThe Lower Devonian around the "Lac de la Gileppe"
Steemans, Philippe ULg; Gerrienne, Philippe ULg

Conference (1994)

Detailed reference viewed: 17 (0 ULg)
See detailLower Devonian flora from Morocco and its palaeogeographical implications
Gerrienne, Philippe ULg; Fairon-Demaret, Muriel ULg; Galtier, J. et al

Conference (1997)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailLower Devonian palynomorphs from the San Juan Precordillera, Argentina
Rubinstein, C. V.; Le Hérissé, A.; Steemans, Philippe ULg

Conference (1996)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailLower Devonian Palynomorphs from the Talacasto Formation, Cerro del Fuerte Section, San Juan Precordillera, Argentina
Le Hérissé, A; Rubinstein, CR; Steemans, Philippe ULg

in Acta Universitatis Carolinae. Geologica (1996), 40(3-4), 497-515

Detailed reference viewed: 11 (1 ULg)
See detailLower Devonian plant mesofossils from Paraná Basin, Brazil: general introduction, description, age significance and correlation with floral succession from Laurussia and Gondwana.
Gerrienne, Philippe ULg

in Rodrigues, M.A.C.; Pereira, E. (Eds.) : Ordovician-Devonian palynostratigraphy in Western Gondwana: update, problems and perspectives. (1999)

Detailed reference viewed: 8 (1 ULg)
Full Text
Peer Reviewed
See detailLower Devonian rhynchonellid brachiopods from the Ougarta area (western Sahara, Algeria)
Brice, Denise; Boumendjel, Kheira; Racheboeuf, Patrick R. et al

in Bulletin of Geosciences (2011), 86(1), 71-90

The description and study of rhynchonellid brachiopods recently collected from the Lower Devonian of the Ougarta area in western Algerian Sahara permitted the revision of previously described and/or ... [more ▼]

The description and study of rhynchonellid brachiopods recently collected from the Lower Devonian of the Ougarta area in western Algerian Sahara permitted the revision of previously described and/or listed taxa, mainly from Morocco. Palaeobiogeographically, the nine identified taxa share many similarities with the rhynchonellid fauna of the Ibarmaghian Domain. Five of the nine identified taxa belong to three genera of the Family Nucinulidae Sartenaer, 2004. Three of these are new taxa, namely Nucinulus orbignyanus crassicostus subsp. nov., Cuninulus ougartaensis sp. nov. and Palinulus saharaensis sp. nov. The our remaining taxa are assigned (one of them questionably) to the genera Lanceomyonia, Stenorhynchia and Glossinulus of the families Hebetoechiidae, Trigonirhynchiidae, and Glossinotoechiidae, respectively. [less ▲]

Detailed reference viewed: 74 (7 ULg)
See detailLower Devonian spores from South Wales.
Chaloner, W.G.; Streel, Maurice ULg

in Argumenta Palaeobotanica (1968), 1

Detailed reference viewed: 11 (0 ULg)
See detailLower Devonian spores from the Ardennes-Rhine area
Steemans, Philippe ULg

Conference (1984)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailLower impact of blue light on non-visual brain functions in older subjects
Daneault, V; Vandewalle, Gilles ULg; Hébert, M et al

Poster (2012, February)

Detailed reference viewed: 8 (3 ULg)
Full Text
Peer Reviewed
See detailLower intracellular concentration of cryoprotectants after vitrification than after slow freezing despite exposure to higher concentration of cryoprotectant solutions.
Vanderzwalmen, P.; Connan, Delphine ULg; Grobet, Luc ULg et al

in Human reproduction (Oxford, England) (2013)

STUDY QUESTION: What is the intracellular concentration of cryoprotectant (ICCP) in mouse zygotes during vitrification (VIT) and slow-freezing (SLF) cryopreservation procedures? SUMMARY ANSWER: Contrary ... [more ▼]

STUDY QUESTION: What is the intracellular concentration of cryoprotectant (ICCP) in mouse zygotes during vitrification (VIT) and slow-freezing (SLF) cryopreservation procedures? SUMMARY ANSWER: Contrary to common beliefs, it was observed that the ICCP in vitrified zygotes is lower than after SLF, although the solutions used in VIT contain higher concentrations of cryoprotectants (CPs). WHAT IS KNOWN ALREADY: To reduce the likelihood of intracellular ice crystal formation, which has detrimental effects on cell organelles and membranes, VIT was introduced as an alternative to SLF to cryopreserve embryos and gametes. Combined with high cooling and warming rates, the use of high concentrations of CPs favours an intracellular environment that supports and maintains the transition from a liquid to a solid glass-like state devoid of crystals. Although the up-to-date publications are reassuring in terms of obstetric and perinatal outcomes after VIT, a fear about exposing gametes and embryos to high amounts of CPs that exceed 3-4-fold those found in SLF was central to a debate initiated by advocates of SLF procedures. STUDY DESIGN, SIZE, DURATION: Two experimental set-ups were applied. The objective of a first study was to determine the ICCP at the end of the exposure steps to the CP solutions with our VIT protocol (n = 31). The goal of the second investigation was to compare the ICCP between VIT (n = 30) and SLF (n = 30). All experiments were performed in triplicates using mouse zygotes. The study took place at the GIGA-Research Institute of the University of Liege. PARTICIPANTS/MATERIALS, SETTING, METHODS: Cell volume is modified by changes in extracellular osmolarity. Hence, we estimated the final ICCP after the incubation steps in the VIT solutions by exposing the cells to sucrose (SUC) solutions with defined molarities. The ICCP was calculated from the SUC concentration that produced no change in cell volume, i.e. when intra- and extracellular osmolarities were equivalent. Cell volume was monitored by microscopic cinematography. ICCP was compared between SLF and VIT based on the principle that a high ICCP lowers the probability of (re)crystallization during warming but increases the probability of over-swelling of the cell due to fast inflow of water. The survival rates of mouse zygotes after SLF or VIT were compared using either (i) various warming rates or (ii) various concentrations of SUC in the warming dilution medium. MAIN RESULTS AND THE ROLE OF CHANCE: The ICCP in mouse zygotes during the VIT procedure prior to plunging them in liquid nitrogen was approximately 2.14 M, i.e. one-third of the concentration in the VIT solution. After SLF, the warming rate did not affect the zygote survival rate. In contrast, only 3/30 vitrified zygotes survived when warmed slowly but as many as 30/30 zygotes survived when warming was fast (>20 000 degrees C/min). Vitrified zygotes showed significantly higher survival rates than slow-frozen zygotes when they were placed directly in the culture medium or in solutions containing low concentrations of SUC (P < 0.01). These two experiments demonstrate a lower ICCP after VIT than after SLF. LIMITATIONS, REASONS FOR CAUTION: The results should not be directly extrapolated to other stages of development or to other species due to possible differences in membrane permeability to water and CPs. WIDER IMPLICATIONS OF THE FINDINGS: The low ICCP we observed after VIT removes the concern about high ICCP after VIT, at least in murine zygotes and helps to explain the observed efficiency and lack of toxicity of VIT. STUDY FUNDING / COMPETING INTEREST(S): The study was funded by the FNRS (National Funds for Scientific Research). The authors declare that they have no competing interests. [less ▲]

Detailed reference viewed: 34 (18 ULg)
Full Text
See detailLower Palaeozoic and Devonian carbonate facies in Nepal
Pas, Damien ULg; Boulvain, Frédéric ULg

Poster (2009, September 14)

Nepal is localized in the central part of the Himalayan arc. In uplift since the Cenozoic time, the Himalaya is traditionally divided into six lithotectonic zones extending in parallel belts. From north ... [more ▼]

Nepal is localized in the central part of the Himalayan arc. In uplift since the Cenozoic time, the Himalaya is traditionally divided into six lithotectonic zones extending in parallel belts. From north to south there are respectively: (1) the Trans-Himalayan batholith; (2) the Indus-Tsangpo suture zone; (3) the Tethyan (Tibetan) Himalaya; (4) the Higher (Greater) Himalaya; (5) the Lesser Himalaya; and (6) the Sub-Himalaya. This PhD thesis is focused on the Tethyan sedimentary rocks exposed in the Nepal Tethyan Himalaya belt and in the thrusting nappes belonging to the Lesser Himalaya. These nappes contain unmetamorphosed sedimentary rocks which might belong to the Tethyan sedimentary succession. The Tethyan Himalaya has preserved highly fossiliferous marine rocks deposited on the shelf and slope of the Indian continental margin from Late Proterozoic-Cambrian through early Eocene times. The main objective of this PhD thesis is to build a first sedimentological canvas for the Lower Paleozoic and Devonian carbonated rocks of Nepal which could be compared with the Belgian facies. This long distance comparison between the Belgian and the Nepalese basins will allow to have a better understanding of the phenomena that run the global carbonate sedimentation. The methods that will be used to achieve this work are: (1) bed by bed sampling; (2) petrographic analysis and facies modelling; (3) magnetic susceptibility analysis for correlations and eustatism and (4) paleontological datation. A first sedimentological campaign took place during the months of March and April 2009. It allowed to study three sections around Katmandu valley and two sections in the Annapurna range (Manang area). The sections studied around Katmandu (Pulchauki and Chandragiri Hill) belonged to the Formation of Chandragiri (Ordovician) and Godavari (Devonian) which are mainly constituted by carbonate rocks. The sections described in Manang area are mainly made-up by the terrigeneous rocks of the Dark Band, Tilicho Pass and Tilicho Lake Formation (Silurian to Lower Carboniferous). The diversity of facies observed in these five sections will be exposed. [less ▲]

Detailed reference viewed: 18 (5 ULg)
Full Text
Peer Reviewed
See detailLower Palaeozoic palaeo(bio)geographies
Wellman, C.H.; Steemans, Philippe ULg; Vecoli, M.

in Lower Palaeozoic palaeo(bio)geographies (2014)

Detailed reference viewed: 80 (6 ULg)
See detailThe Lower to Middle Devonian transitional flora from Dechra-Aït-Abdallah (Morocco).
Prestianni, Cyrille ULg; Meyer-Berthaud, Brigitte; Gerrienne, Philippe ULg

Conference (2010)

Detailed reference viewed: 13 (1 ULg)