3,714 research outputs found
DS_10.1177_0022034518807920 – Supplemental material for Purinergic Signaling Modulates Survival/Proliferation of Human Dental Pulp Stem Cells
No full textSupplemental material, DS_10.1177_0022034518807920 for Purinergic Signaling Modulates Survival/Proliferation of Human Dental Pulp Stem Cells by S. Zhang, D. Ye, L. Ma, Y. Ren, R.T. Dirksen and X. Liu in Journal of Dental Research</p
Ecology of the Festuca Grassland in Central Saskatchewan
No full textFor some time it has been realized that the grassland occuring in the 'park belt' or 'aspen grove region' bounding the Canadian prairies on the north, and forming the transition between it and the boreal forest, does not consist merely of extensions of the adjacent grassland communities (true prairie or mixed prairie) among the patches of woodland which occur in that region; but is characterized by a different group of dominant grasses from those occuring elsewhere in North America.
Although other investigators have mentioned this fact and written about the flora in other parts of the region, their data have been based largely on methods of estimation chiefly of a qualitative nature. In view of this, it was thought that an ecological survey based on quantitative methods might provide a better basis for classifying the vegetation of the area.
Accordingly, while being employed as an assistant in the Department of Plant Ecology of the University of Saskatchewan the author was given the opportunity, under the supervision of Dr. R.T. Coupland, to carry out investigations in those parts of the aspen grove region north and northwest of Saskatoon.
The author is considerably indebted to Dr. B.W. Currie of the Physics Department, for furnishing data on the climate of the area of research, and to Mr. H.C. Moss and his assistants, of the Saskachewan Soil Survey, who kindly undertook to examine and report on the soil samples which were collected in several of the sites studied. The author also wishes to express his gratitide to Mr. Jack F. Alex and Mr. W. Budz of the Department of Plant Ecology, who assisted greatly in both the field and laboratory work for this project. The financial assistance of the Saskatchewan Agricultural Research Foundation, which made this study possible, is also appreciated.
The author experienced a great deal of difficulty as a result of unfamiliarity with the topography, in particular with the vegetation of the plants, since he is more accustomed to the mountains and forests of British Columbia. Many problems of identifications were encountered in dealing with the wealth of species of grasses and composites, as well as problems of relationship between the communities found in certain locations and their topographical situation
Data for: Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia
No full textRaw data for Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia by E.D. Currano, B.F. Jacobs, R.T. Bush, A. Novello, M. Feseha, F. Grímsson, F.A. McInerney, L. Michel, A.D. Pan, S. Phelps, P. Polissar, C.A.E. Strömberg, N.J. Tabor. This includes phytolith counts, leaf macrofossil counts, and lipid abundances and carbon isotope values
Data for: Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia
No full textRaw data for Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia by E.D. Currano, B.F. Jacobs, R.T. Bush, A. Novello, M. Feseha, F. Grímsson, F.A. McInerney, L. Michel, A.D. Pan, S. Phelps, P. Polissar, C.A.E. Strömberg, N.J. Tabor. This includes phytolith counts, leaf macrofossil counts, and lipid abundances and carbon isotope values
Chronology of the earliest peopling of the Ethiopian highlands at Melka Kunture pre-dating the 1.925 Ma base of the Olduvai subchron
No full textMelka Kunture on the highlands of Ethiopia has provided evidence for the early peopling of the Ethiopian highlands (>2000 m asl). At site Garba IV, an Oldowan technocomplex was retrieved in levels E-F located shortly below the base of the Olduvai subchron, with a currently accepted age of 1.925 Ma, while the early Acheulean was found in level D located close to the base of the Olduvai subchron. The base of the Olduvai subchron becomes therefore a prime chronostratigraphic marker for the study of the early peopling of the Ethiopian plateau in the Early Pleistocene. Here we report new magnetostratigraphic data from two sections from the Kella valley located close to Garba IV, namely Kella III bis and Kella Bridge. We document in these sections the occurrence of the Olduvai subchron, confirmed also by 40Ar/39Ar ages from the literature. We correlate these new data to previous data from Garba IV, establishing a robust registry of the critical Olduvai subchron in the lower part of the Middle Succession (part of the former Melka Kunture Formation), spanning altogether from ∼2 Ma to ∼1.2 Ma, and we also point to a regional basal unconformity marking its onset of deposition. The better constrained magnetochronology provides firm evidence that hominins were peopling areas at 2000 m of altitude at least 2 million years ago
Data for: Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia
No full textRaw data for Ecological dynamic equilibrium in an early Miocene (21.7 Ma) forest, Ethiopia by E.D. Currano, B.F. Jacobs, R.T. Bush, A. Novello, M. Feseha, F. Grímsson, F.A. McInerney, L. Michel, A.D. Pan, S. Phelps, P. Polissar, C.A.E. Strömberg, N.J. Tabor. This includes phytolith counts, leaf macrofossil counts, and lipid abundances and carbon isotope values.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV
Coordination in an Adaptive Traffic Signal Control System
No full textCoordination between the intersections is used in traffic signal control for quite a long time. The objective of this thesis is to determine how beneficial network coordination is in an adaptive traffic signal control system that follows the multi-agent approach. As part of the research: Simulation results show that coordination in a multi-agent controller can reduce average delay of the users on the network depending on the average demand. The best performing coordination measure is platooning cars on the main streams at the first intersection of the arterial. This provide time for the downstream intersections to serve side streams and ensured that the main stream is not stopped at the downstream intersections on the arterial. The tested coordination measures reduced delay with 10% compared to the original settings.Transport and PlanningTransport & PlanningCivil Engineering and Geoscience
The implementation of a system description language and its semantic functions
No full textElectrical Engineering, Mathematics and Computer Scienc
Adattamento ambientale e sfruttamento delle risorse nel sito archeologico di Sa Osa – Cabras (OR)
No full textIl sito archeologico di Sa Osa si trova nel golfo di Oristano, nella Sardegna centro-occidentale, vicino alla laguna di Cabras.
L'area appare molto interessante sia per il contesto ambientale sia per le testimonianze archeologiche, in particolare dell’età del bronzo, ma anche del primo Ferro sino all’età medievale.
Il contesto geomorfologico è caratterizzata da una pianura alluvionale relativa ai fiumi Tirso e Tanui, e dalla presenza di un sistema lagunare e di una pianura costiera. Le dinamiche fluviali e costiere, sono state influenzate dal livello del mare e dai cambiamenti climatici quaternari e hanno a loro volta condizionato l’insediamento umano.The archaeological site of Sa Osa is located in the gulf of Oristano, in central-west Sardinia, very close to Cabras lagoon.
It’s very interesting for both archaeological and environmental context. The area is overspread of archaeological evidence, especially from Bronze Age but even from punic and roman times.
The geomorphologic context is a result of fluvial and coastal dynamics, influenced by quaternary sea level and climate changes and have in turn influenced human settlement. It’s characterized by a floodplain, related to Tirso and Tanui rivers, with the presence of a lagoon system and of a coastal plain
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