Morphological and paleoecological analysis of the Ordovician ankyroid Lagynocystis (Stylophora: Echinodermata)

2000 ◽  
Vol 74 (2) ◽  
pp. 254-262
Author(s):  
Ronald L. Parsley
Keyword(s):  
Deep Water ◽  
Environmental Conditions ◽  
Middle Ordovician ◽  
Thecal Plate ◽  
Marginal Plates ◽  
The Right

Despite its atypical thecal plate pattern, Lagynocystis pyramidalis (Jaekel, 1918) (Middle Ordovician, Northern Gondwanaland) is composed of normally positioned marginal plates on the left side of the theca, whereas those on the right side are shortened or missing in comparison with marginal plates of other ankyroids. The only somatic on the lower thecal surface is the CS plate. The abnormally long distal aulacophore, reduced theca, and internal ctenoid organ are interpreted as adaptations to deep water, dysaerobic environmental conditions. Ctenoid organ morphology is re-evaluated and is interpreted to have both feeding and respiratory functions. Loss of plates relative to a presumed ancestor similar to Barrandeocarpus has resulted in torsion that places somatic platelets, originally on the superior face, onto the inferior face and in contact with both CS and M′3 plates.

scholarly journals Florida-Friendly Plants for Stormwater Pond Shorelines

EDIS ◽  
2013 ◽  
Vol 2013 (5) ◽  
Author(s):  
Gail Hansen ◽  
Shangchun Hu
Keyword(s):  
Water Quality ◽  
Water Depth ◽  
Deep Water ◽  
Environmental Conditions ◽  
Site Conditions ◽  
Plant Establishment ◽  
Dry Conditions ◽  
Stormwater Pond ◽  
The Right ◽  
Steep Slopes

Selecting aquatic and shoreline plants for stormwater ponds is more challenging than selecting plants for a typical landscape. Site conditions can vary greatly and are more difficult to control. For example, water depth sometimes fluctuates widely, creating wet and dry conditions. Water quality varies with rainfall and fertilizer inputs. Steep slopes can make plant establishment and retention difficult. The concept of using the right plant in the right place is particularly important in the shoreline environment because the planting area includes a dry slope and a littoral shelf with shallow and deep-water areas. This 4-page fact sheet recommends plants that were selected based on these three questions: 1) What environmental conditions does the plant need to grow? 2) How do you want the plant to function? 3) What do you want the plant to look like? Written by Gail Hansen and Shangchun Hu, and published by the UF Department of Environmental Horticulture, May 2013. http://edis.ifas.ufl.edu/ep476

New record of the deep water Epimeria morronei Winfield, Ortiz & Hendrickx (Amphipoda, Gammaridea, Epimeriidae) in the east Pacific

Crustaceana ◽  
2014 ◽  
Vol 87 (14) ◽  
pp. 1699-1703
Author(s):  
Michel E. Hendrickx ◽  
Ignacio Winfield ◽  
Manolo Ortiz
Keyword(s):  
Deep Water ◽  
Environmental Conditions ◽  
New Record ◽  
New Records ◽  
Eastern Pacific ◽  
Depth Range ◽  
East Pacific

New records for the deep-water amphipod Epimeria morronei Winfield, Ortiz & Hendrickx, 2012, are presented for the eastern Pacific. Also, new data related to its depth range and environmental conditions are given.

New echinoderms from the Early Ordovician of west Texas

1994 ◽  
Vol 68 (2) ◽  
pp. 324-338 ◽  
Author(s):  
James Sprinkle ◽  
Gregory P. Wahlman
Keyword(s):  
North America ◽  
El Paso ◽  
Middle Ordovician ◽  
Early Ordovician ◽  
West Texas ◽  
Lower Ordovician ◽  
Single Well ◽  
Thecal Plate ◽  
Stem Segments

Four specimens of blastozoan and crinozoan echinoderms are described from the Lower Ordovician El Paso Group in the southern Franklin Mountains just north of El Paso, west Texas.Cuniculocystis flowerin. gen. and sp., based on two partial specimens, appears to be a typical rhombiferan in most of its morphologic features except that it lacks pectinirhombs and instead has covered epispires (otherwise known only from Middle Ordovician eocrinoids) opening on most of the thecal plate sutures. The covered epispires inCuniculocystisindicate that some early rhombiferans had alternate respiratory structures and had not yet standardized on pectinirhombs, a feature previously used as diagnostic for the class Rhombifera.Bockia?elpasoensisn. sp. is a new eocrinoid based on one poorly preserved specimen that has a small ellipsoidal theca and unbranched brachioles attached to a flat-topped spoutlike summit. It is the earliest known questionable representative of this genus and the only one that has been described from North America.Elpasocrinus radiatusn. gen. and sp. is an early cladid inadunate crinoid based on a single well-preserved calyx. It fits into a lineage of early cladids leading to the dendrocrinids and toCarabocrinus.Several additional separate plates, stem segments, and a holdfast of these and other echinoderms are also described.

scholarly journals Elements constituent for the design of a riser system in areas deep water and extreme deep water applied for offshore drilling

2020 ◽  
Vol 6 (3) ◽  
pp. 127-144
Author(s):  
Marius STAN ◽  
◽  
Valentin Paul TUDORACHE ◽  
Lazăr AVRAM ◽  
Mohamed Iyad AL NABOULSI ◽  
...  
Keyword(s):  
Working Conditions ◽  
Water Depth ◽  
Deep Water ◽  
Environmental Conditions ◽  
Oil And Gas ◽  
Operational Mode ◽  
Exploration And Exploitation ◽  
Offshore Drilling ◽  
The Stability ◽  
Marine Platform

Riser systems are integral components of the offshore developments used to recover oil and gas stored in the reservoirs below the earth’s oceans and seas. These riser systems are used in all facets of the development offshore process including exploration and exploitation wells completion/intervention, and production of the hydrocarbons. Their primary function is to facilitate the safe transportation of material, oil and gases between the seafloor oceans and seas and the marine platform. As the water depth increases, the working conditions of this system becomes challenging due to the complex forces and extreme environmental conditions which are impacting the operational mode as well as the stability. In this paper several aspects concerning riser mechanics and the behaviour of the riser column will be evaluated against different operational situations.

Deep-Water Contourite Drifts in the West of North-China Platform

2013 ◽  
Vol 318 ◽  
pp. 447-452
Author(s):  
Shun She Luo ◽  
Zhen Zhong Gao ◽  
You Bin He ◽  
Qi Qi Lv ◽  
Ying Meng
Keyword(s):  
Deep Water ◽  
North China ◽  
The West ◽  
North China Platform ◽  
Middle Ordovician ◽  
Contourite Drifts

The middle Ordovician of Pingliang area on the west margin of North-China platform is represented by a succession of deep-water sediments in which contourites are well-developed. Contour current deposits are well-developed. The contourites can be classified into:calcarenitic contourite, calcisiltitic contourite and calcilutitic contourite. Three typical contourite successions are recognized: complete contourite succession, incomplete contourite succession and contourite successions consisting only of calcarenitic contourites. According to the palaeocorrent and the palaeogeographic format analyse,carbonate contourite drift in the study area is unfolded crossing northwest-southeast, forwarding from southeast to northwest along the slope, and compared with other contourite drifts, it has some characteristics of coarser-grained sediment, thicker individual layers, and highly developed calcarenitic contourites and so on.

Testing the universality of biology: a review

2007 ◽  
Vol 6 (3) ◽  
pp. 241-248 ◽  
Author(s):  
J. Chela-Flores
Keyword(s):  
Environmental Conditions ◽  
Common Ancestor ◽  
Seminal Contribution ◽  
The Earth ◽  
Molecular Events ◽  
The Origin Of Life ◽  
The Right ◽  
Life On Earth ◽  
Cosmic Convergence ◽  
The Universe

AbstractWe discuss whether it is possible to test the universality of biology, a quest that is of paramount relevance for one of its most recent branches, namely astrobiology. We review this topic in terms of the relative roles played on the Earth biota by contingency and evolutionary convergence. Following the seminal contribution of Darwin, it is reasonable to assume that all forms of life known to us so far are not only terrestrial, but are descendants of a common ancestor that evolved on this planet at the end of a process of chemical evolution. We also raise the related question of whether the molecular events that were precursors to the origin of life on Earth are bound to occur elsewhere in the Universe, wherever the environmental conditions are similar to the terrestrial ones. We refer to ‘cosmic convergence’ as the possible occurrence elsewhere in the Universe of Earth-like environmental conditions. We argue that cosmic convergence is already suggested by observational data. The set of hypotheses for addressing the question of the universality of biology can be tested by future experiments that are feasible with current technology. We focus on landing on Europa and the broader implications of selecting the specific example of the right landing location. We have previously discussed the corresponding miniaturized equipment that is already in existence. The significance of these crucial points needs to be put into a wider scientific perspective, which is one of the main objectives of this review.

scholarly journals The CLIMATE CHANGE IMPACT ON THE HUMAN RIGHT TO ENVIRONMENTAL CONDITIONS OF A SPECIFIED QUALITY (SAFE, CLEAN, HEALTHY AND SUSTAINABLE ENVIRONMENT): SOME INTERNATIONAL ENVIRONMENTAL LAW ISSUES

2019 ◽  
Vol 36 (1) ◽  
pp. 93-112
Author(s):  
Olha Sushyk ◽  
Olena Shompol
Keyword(s):  
Climate Change ◽  
Human Rights ◽  
Environmental Conditions ◽  
Environmental Law ◽  
International Environmental Agreements ◽  
Ghg Emissions ◽  
Environmental Safety ◽  
Human Right ◽  
Human Environment ◽  
The Right

This article discusses recognition between climate change and human rights at the international level. The analysis shows that despite the UN climate change framework does not adequately address the magnitude of the threat posed by climate change related harm to human rights, domestic, regional or international courts must take account of its provisions in deciding cases. The article argues that the causes for climate cases are diverse, whereby the most often ones are those referring to the competent public authority’s failure to fulfil its obligation to regulate limitations of the greenhouse gas (GHG) emissions.  Further identify the links between human rights and environmental protection, were apparent at least from the first international conference on the human environment, held in Stockholm in 1972. More broadly, it demonstrates international environmental agreements, were some aspects of the right to environmental conditions of a specified quality are identify.  This article discusses also theoretical issues of individual environmental rights and the right to environmental safety in Ukraine. Keywords: climate, human rights, environmental, Ukraine

scholarly journals Biostratigraphic reconnaissance in the Lower Palaeozoic of western North Greenland

1984 ◽  
Vol 121 ◽  
pp. 19-51
Author(s):  
P.R Dawes ◽  
J.S Peel
Keyword(s):  
Fault Zone ◽  
Deep Water ◽  
Lower Cambrian ◽  
The South ◽  
The West ◽  
Middle Ordovician ◽  
Water Trough ◽  
Lower Palaeozoic ◽  
North Greenland ◽  
Land Region

Sections and fossil collections resulting from activities under Operation Grant Land 1965-66 in the Hall Land - Wulff Land region of western North Greenland are briefly discussed. Strongly tectonised Lower Cambrian to Silurian strata are present in the northern part of the area in association with the Wulff Land anticline and the Nyeboe Land fault zone. To the south, platform and deep-water trough sequences are generally little disturbed and strata range in age from Middle Ordovician to Late Silurian (Pridoli). Most stratigraphic units can be accommodated in stratigraphic schemes established in Washington Land, to the west, or Peary Land, to the east.

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