scholarly journals Formation of De Geer Moraines Deposited Subglacially, Central Québec

2007 ◽  
Vol 49 (3) ◽  
pp. 337-361 ◽  
Author(s):  
Luc M. Beaudry ◽  
Gilbert Prichonnet
Keyword(s):  
Structure Analysis ◽  
Deformation Structure ◽  
Proximal Side ◽  
Deformation Structures ◽  
Facies Associations ◽  
Basal Till ◽  
First Time

ABSTRACT This paper presents a model for the genesis of De Geer moraines in the Chapais and Radisson areas, Québec. The model is mainly based on faciès and deformation structure analysis. Three facies associations have been identified: (1) sorted sediments that form foreset laminations dipping downglacier. Till lenses or glacial diamictons are found within the sorted sediments or form a surficial layer on the proximal side of the sections; (2) a non-fissile and poorly compacted till overlies and deforms sorted sediments. Laminae of finely sorted sediments may be incorporated in the till; (3) a fissile and compact till commonly lies on the basal till sheet. All three facies associations feature deformation structures (faults, folds, load and drag structures) which indicate an upglacier origin. The model proposed is an emplacement of De Geer moraines in bottom crevasses by an active glacier. In areas where meltwaters were channelized, sediments accumulated in the crevasses as foreset laminations. Till filled the crevasses in areas remote from meltwater flow. Glacial activity remobilized the basal till locally and pushed it toward bottom crevasses located downglacier, or overturned large layers of till. Finally, in areas located even further laterally, meltwaters had almost no effect and the moraines were formed by plastering of till in the crevasses. The three faciès associations are part of a continuum beginning with the moraines composed of sorted sediments and grading laterally into the moraines formed of fissile and compact till. This continuum is described for the first time.

Procteria (Pachyprocteria) vermifera n. sp., an unusual Hicetes-bearing species of tabulate coral from the lower Eifelian of the Gaspé Sandstones Group, Rimouski County (Quebec, Canada)

2011 ◽  
Vol 48 (12) ◽  
pp. 1530-1542 ◽  
Author(s):  
Yves Plusquellec ◽  
Sylvain Desbiens ◽  
Rémy Gourvennec
Keyword(s):  
New Species ◽  
North America ◽  
Central Area ◽  
York River ◽  
Proximal Side ◽  
Unusual Association ◽  
Tabulate Coral ◽  
First Time

Procteria (Pachyprocteria) vermifera n. sp. is described from the upper part of the York River Formation (Gaspé Sandstones Group), lower Eifelian (brachiopod Amphigenia Zone), Rimouski County (Quebec, Canada). This new species is considered part of a new lineage of Pachyprocteria characterized by the presence of interstitial corallites. This study reveals for the first time that the granules on the lower (proximal) side are distributed irregularly, their density being higher in the central area of this side than at the periphery. The unusual association of the tabulate coral Procteria (Pachyprocteria) with the “worm” Hicetes is pointed out. The record of the new species adds to the known paleogeographic distribution of Pachyprocteria in North America (Laurussia).

Ringschlußversuche mit Phenylborsäure / Attempts for Synthesis of Inorganic Rings with Phenylboric Acid

1978 ◽  
Vol 33 (5) ◽  
pp. 475-478 ◽  
Author(s):  
Ulrich Wannagat ◽  
Gerd Eisele
Keyword(s):  
Structure Analysis ◽  
Ring Systems ◽  
Additional Information ◽  
Compound C ◽  
Inorganic Rings ◽  
Phenylboric Acid ◽  
First Time

Abstract The inorganic ring systems BNCO2Si2 (B) and BCO3Si4 (E) were prepared for the first time via equations (1) and (5), system BCO3Si2 (C) enlarged by preparation of compound C 1 via eq. (4). Synthesis of a system BCO2Si2 (D) failed as well as preparation of five and seven membered building units VI and VIII. For bis(trimethylsiloxy)phenylborane (IX) detailed and additional information about preparation, properties and structure analysis is given. Compound VTI, C5H15NOSi, was obtained for the first time via eq. (7) and described in its properties.

scholarly journals Efficient Isolation and Structure Analysis of (+)-Ranuncoside, a Unique Tricyclic Spiroacetal Glycoside, from Christmas Rose (Helleborus niger L.)

2022 ◽  
Vol 17 (1) ◽  
pp. 1934578X2110694
Author(s):  
Eckehard Cuny ◽  
Franz-Dietrich Klingler
Keyword(s):  
Structure Analysis ◽  
Anticancer Agents ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
System A ◽  
Structure Activity ◽  
First Time ◽  
Absolute Stereochemistry ◽  
Helleborus Niger ◽  
Christmas Rose

The use of medicinal herbs as remedies reaches back to the Stone Age, and their importance as a source of drugs has continuously increased since then. Herbal ingredients can serve as active pharmaceuticals themselves or as lead substances for the development of synthetic pharmaceuticals with less toxicity, higher effectiveness or with new properties. To date, only 6% of the ∼600,000 plants on earth have been tested pharmacologically. Among these, the medicinal plant Helleborus niger L. (Christmas rose) is especially promising because its leaves contain ( + )-ranuncoside 1, characterized by a spiroacetal ring system, a motif which is responsible for the biological activity of a multitude of natural products. Structure-activity relationship studies of ( + )-ranuncoside 1 are lacking and no synthesis of 1 has been described yet. Therefore, we developed a protocol for the rapid and efficient isolation of 1 from the leaves of cultivated Christmas rose. Crystals of high purity were obtained that enabled us to study the stereochemistry of 1 by NMR spectroscopy in solution for the first time. The spiro configuration, the absolute stereochemistry, and the geometry of all three rings was then confirmed by x-ray structure analysis. Our data will enable future structure-activity relationship studies to assess the potential of 1 as a lead substance for the development of novel antibiotics and anticancer agents.

scholarly journals FACIES ASSOCIATIONS AND MICROFOSSILS FROM THE MIDDLE-UPPER TRIASSIC LIMESTONES OF THE TRANSILVANIAN NAPPES (PERȘANI MOUNTAINS, EASTERN CARPATHIANS, ROMANIA)

2019 ◽  
pp. 29-39 ◽  
Author(s):  
Cristian Victor Mircescu ◽  
Ioan Bucur ◽  
Stefania Ghionea ◽  
George Leonard Popa
Keyword(s):  
Upper Triassic ◽  
Fore Reef ◽  
Common Features ◽  
System Form ◽  
Eastern Carpathians ◽  
Facies Associations ◽  
Facies Types ◽  
First Time ◽  
Encrusting Organisms ◽  
Internal Sediment

Triassic limestones that belong to the Transilvanian Nappe system, form extensive outcrops in the central part of the Persani Mountains, near Racos locality, on the southern and northern sides of the Olt Gorges. Triassic carbonate olistoliths were sampled in four distinct locations belonging to the Transilvanian Nappe: the Old Racos Quarry, Olt Gorges, Tipia Racosului Hill and Tipia Ormenisului Hill. The identified facies types include brecciated limestones with encrusting organisms and cyanobacteria, packstone-grainstone with sponges and encrusting organisms, boundstone with grainstone internal sediment, peloidal wackestone-packstone, peloidal packstone-grainstone, intraclastic grainstone-rudstone. Such microfacies characterize reefal bioconstructions or fore-reef domains located in the vicinity of shelf crest areas. They share common features with similar Wetterstein facies carbonates from Italy, Austria or Hungary. The micropaleontological assemblage indicates the Anisian-Ladinian to Carnian ages for the studied limestones, the present study bringing new data concerning the age of these carbonates. In addition, the presence of some foraminifera and dasycladalean algae are mentioned for the first time in this area.

Synthetic Access to a Novel Binaphthyl Ligand Bearing a Phosphine and a Triazole Donor Site

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1438-1448 ◽  
Author(s):  
Claudia May ◽  
Yu Sun ◽  
Gotthelf Wolmershäuser ◽  
Werner R. Thiel
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Structure Analysis ◽  
Donor Site ◽  
Crystal Structure Analysis ◽  
Pure Compound ◽  
Enantiomerically Pure ◽  
X Ray ◽  
First Time

The combination of a diphenylphospinyl and a triazol-3-yl unit was realized for the first time at a 1,1'-binaphthyl backbone. This novel type of P,N-ligand is accessible as an enantiomerically pure compound in just a few steps. First experiments on the coordination chemistry with palladium(II) chloride have been carried out. A series of intermediates and a binuclear palladium(II) complex could be characterized by X-ray crystal structure analysis

Deformation structure analysis of material at fatigue on the basis of the vector field

2017 ◽  
Author(s):  
Vladimir V. Kibitkin ◽  
Andrey I. Solodushkin ◽  
Vasily S. Pleshanov
Keyword(s):  
Vector Field ◽  
Structure Analysis ◽  
Deformation Structure

scholarly journals Study of the growth of three species: Micropterus salmoides (Lacépède, 1802), Cyprinus carpio (Linneaus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in Moroccan continental waters

2021 ◽  
Vol 314 ◽  
pp. 06002
Author(s):  
Loubna Ferraj ◽  
Meriem Bousseba ◽  
Sara Ouahb ◽  
Aziz El Moujtahid ◽  
Mustapha Hasnaoui
Keyword(s):  
Structure Analysis ◽  
Cyprinus Carpio ◽  
Oreochromis Niloticus ◽  
Size Structure ◽  
Growth Parameters ◽  
Micropterus Salmoides ◽  
Von Bertalanffy ◽  
Growth Equations ◽  
First Time

The growth parameters of three species were studied for the first time in the AlMassira Dam. A total of 137 individuals were examined during this study between September 2020 and January 2021. The estimation of growth parameters was carried out by size structure analysis using FISAT II software. The growth parameters of Micropterus salmoides, Cyprinus carpio and Oreochromis niloticus are respectively: L∞= 35.11 cm, K= 0.58 year-1, t0= 0.57 year; L∞= 44.85 cm, K= 2.60 year-1, t0= 1.27 year and L∞= 45.26 cm, K= 0.32 year-1, t0= 0.33 year. Thus, the Von Bertalanffy growth equations are written respectively: L(t) = 35.11 (1-e-0.58 (t+0.57)), L (t)= 44.85 (1-e-2.60 (t+1.27)) and L (t)= 45.26 (1-e-0.32 (t+0.33)).

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