scholarly journals On the status of the giant mylodontine sloth Glossotherium wegneri (Spillmann, 1931) (Xenarthra, Folivora)from the late Pleistocene of Ecuador

2020 ◽  
Author(s):  
Gerardo DE IULIIS ◽  
Alberto BOSCAINI ◽  
François PUJOS ◽  
Robert K. MCAFEE ◽  
Cástor CARTELLE ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Comparative Analyses ◽  
Zygomatic Process ◽  
Anterior Edge ◽  
The Status

The late Pleistocene mylodontine sloth Glossotherium wegneri (Spillmann, 1931) (Interandean ­region, Ecuador) has been assigned to Glossotherium Owen, 1839 and Oreomylodon Hoffstetter, 1949 (the latter ranked as a subgenus or genus), and synonymized with G. robustum (Owen, 1842). However, the phylogenetic and comparative analyses conducted here, which include previously undescribed remains, strongly suggest specific distinction for G. wegneri and that there is little, if any, support for generic or subgeneric distinction for Oreomylodon. Among the notable features of this species are the ­presence of an internasal element, marked expansion of the rostrum anteriorly, and dorsoventrally and the palatal region transversely, increased separation of the caniniform tooth from the anterior edge of maxilla, increased relative braincase width, relatively enlarged hypoglossal foramen, and greatly elongated zygomatic process of the squamosal. The resulting single MPT recovered a monophyletic Glossotherium, with the following phylogenetic arrangement of the species of this genus (G. robustum + ((G. wegneri + G. tropicorum Hoffstetter, 1952) + (G. phoenesis Cartelle, De Iuliis, Boscaini & Pujos, 2019 + G. tarijense Ameghino, 1902))).

An emerging “Islandian” sovereignty of non-self-governing islands

2017 ◽  
Vol 72 (1) ◽  
pp. 56-78 ◽  
Author(s):  
Gerard Prinsen ◽  
Séverine Blaise
Keyword(s):  
New Caledonia ◽  
Analytical Framework ◽  
Status Quo ◽  
Comparative Analyses ◽  
Development Indicators ◽  
Political Independence ◽  
The Status ◽  
New Form ◽  
Global Research

Comparative analyses have found that non-self-governing islands tend to have much better development indicators than sovereign islands. Perhaps unsurprisingly, since 1983 no non-self-governing island has acquired political independence. This paper argues that rather than merely maintaining the status quo with their colonial metropoles, non-self-governing islands are actively creating a new form of sovereignty. This creation of an “Islandian” sovereignty takes place against the backdrop of debates on the relevance of classic Westphalian sovereignty and emerging practices of Indigenous sovereignty. This paper reviews global research on the sovereignty of islands and from this review, develops an analytical framework of five mechanisms that drive the emerging Islandian sovereignty. This framework is tested and illustrated with a case study of the negotiations about sovereignty between New Caledonia and its colonial metropole, France.

Advances in hunter-gatherer research in Mexico

2017 ◽  
Author(s):  
Joaquin Arroyo-Cabrales ◽  
Eduardo Corona-M.
Keyword(s):  
Late Pleistocene ◽  
Radiocarbon Dating ◽  
Hunter Gatherers ◽  
Subsistence Strategies ◽  
Ams Radiocarbon Dating ◽  
Terrestrial Vertebrates ◽  
New Methods ◽  
Methods And Techniques ◽  
The Status ◽  
Scanning Electron

Interest in the first hunter-gatherer populations of Mexico has increased in the last fifteen years. Exploration of the Late Pleistocene localities involved in the early peopling of Mexico, including the discovery of new ones and reanalysis of known ones, and the application of new methods and techniques (e.g. AMS radiocarbon dating, stable isotopes, scanning electron microscopy, palaeobotanical analysis) have increased. Archaeozoology has contributed to this expansion by increasing the record of terrestrial vertebrates, improving understanding of the record and delimitation of distributional ranges of extinct species. There is now more information on the type of diet of some extinct herbivores and hypotheses about the status of local palaeoenvironments have been provided. Questions remain about the interactions between human migrations and the environments, specifically the degree of influence that humans had in the extinction of mega- and mesofaunas, and the diversity of subsistence strategies employed by hunter-gatherers in the Late Pleistocene.

The study of interfacial reactions of nickel thin films on GaAs

1983 ◽  
Vol 41 ◽  
pp. 156-157
Author(s):  
L.J. Chen ◽  
Y.F. Hsieh
Keyword(s):  
Thin Films ◽  
Integrated Circuits ◽  
Interfacial Reactions ◽  
Metal Contacts ◽  
Nickel Thin Films ◽  
Thin Foils ◽  
The Status ◽  
Si Doped ◽  
Electron Microscopes

One measure of the maturity of a device technology is the ease and reliability of applying contact metallurgy. Compared to metal contact of silicon, the status of GaAs metallization is still at its primitive stage. With the advent of GaAs MESFET and integrated circuits, very stringent requirements were placed on their metal contacts. During the past few years, extensive researches have been conducted in the area of Au-Ge-Ni in order to lower contact resistances and improve uniformity. In this paper, we report the results of TEM study of interfacial reactions between Ni and GaAs as part of the attempt to understand the role of nickel in Au-Ge-Ni contact of GaAs.N-type, Si-doped, (001) oriented GaAs wafers, 15 mil in thickness, were grown by gradient-freeze method. Nickel thin films, 300Å in thickness, were e-gun deposited on GaAs wafers. The samples were then annealed in dry N2 in a 3-zone diffusion furnace at temperatures 200°C - 600°C for 5-180 minutes. Thin foils for TEM examinations were prepared by chemical polishing from the GaA.s side. TEM investigations were performed with JE0L- 100B and JE0L-200CX electron microscopes.

Development of a Rapid Survey Method of Sampling and Analysis for Asbestos in Ambient Air

1972 ◽  
Vol 30 ◽  
pp. 630-631 ◽  
Author(s):  
R. E. Heffelfinger ◽  
C. W. Melton ◽  
D. L. Kiefer ◽  
W. M. Henry ◽  
R. J. Thompson
Keyword(s):  
Neutron Activation ◽  
Ambient Air ◽  
Survey Method ◽  
Potential Hazard ◽  
Transmission Microscopy ◽  
Comparative Analyses ◽  
Asbestos Fibers ◽  
Controlled Conditions ◽  
Unequivocal Identification ◽  
Identification And Quantification

A methodology has been developed and demonstrated which is capable of determining total amounts of asbestos fibers and fibrils in air ranging from as low as fractional nanograms per cubic meter (ng/m3) of air to several micrograms/m3. The method involves the collection of samples on an absolute filter and provides an unequivocal identification and quantification of the total asbestos contents including fibrils in the collected samples.The developed method depends on the trituration under controlled conditions to reduce the fibers to fibrils, separation of the asbestos fibrils from other collected air particulates (beneficiation), and the use of transmission microscopy for identification and quantification. Its validity has been tested by comparative analyses by neutron activation techniques. It can supply the data needed to set emissions criteria and to serve as a basis for assessing the potential hazard for asbestos pollution to the populace.

Fate of sperm membrane in fertilized ova

1993 ◽  
Vol 51 ◽  
pp. 40-41
Author(s):  
Frank J. Longo
Keyword(s):  
Electron Microscopy ◽  
Electrical Activity ◽  
Sea Urchins ◽  
Morphological Changes ◽  
Integrated System ◽  
Electrophysiological Recording ◽  
Experimental Conditions ◽  
The Status ◽  
Sperm Membrane ◽  
Temporal And Spatial

Measurement of the egg's electrical activity, the fertilization potential or the activation current (in voltage clamped eggs), provides a means of detecting the earliest perceivable response of the egg to the fertilizing sperm. By using the electrical physiological record as a “real time” indicator of the instant of electrical continuity between the gametes, eggs can be inseminated with sperm at lower, more physiological densities, thereby assuring that only one sperm interacts with the egg. Integrating techniques of intracellular electrophysiological recording, video-imaging, and electron microscopy, we are able to identify the fertilizing sperm precisely and correlate the status of gamete organelles with the first indication (fertilization potential/activation current) of the egg's response to the attached sperm. Hence, this integrated system provides improved temporal and spatial resolution of morphological changes at the site of gamete interaction, under a variety of experimental conditions. Using these integrated techniques, we have investigated when sperm-egg plasma membrane fusion occurs in sea urchins with respect to the onset of the egg's change in electrical activity.

Revisiting the status of dental ethics instruction

2000 ◽  
Vol 64 (11) ◽  
pp. 772-774 ◽  
Author(s):  
JG Odom ◽  
PL Beemsterboer ◽  
TD Pate ◽  
NK Haden
Keyword(s):  
Ethics Instruction ◽  
The Status

The status of cosmology

2002 ◽  
Vol 110 (2) ◽  
pp. 9-15 ◽  
Author(s):  
W Freedman
Keyword(s):  
The Status

Multicultural Assessment of Personality and Psychopathology in the United States: Still Art, Not Yet Science, and Controversial

1998 ◽  
Vol 14 (1) ◽  
pp. 62-70 ◽  
Author(s):  
Richard H. Dana
Keyword(s):  
United States ◽  
Racial Identity ◽  
The United States ◽  
Therapeutic Assessment ◽  
Culturally Competent ◽  
Research Attention ◽  
The Status ◽  
Training Research ◽  
Multicultural Assessment ◽  
Personality Description

This paper describes the status of multicultural assessment training, research, and practice in the United States. Racism, politicization of issues, and demands for equity in assessment of psychopathology and personality description have created a climate of controversy. Some sources of bias provide an introduction to major assessment issues including service delivery, moderator variables, modifications of standard tests, development of culture-specific tests, personality theory and cultural/racial identity description, cultural formulations for psychiatric diagnosis, and use of findings, particularly in therapeutic assessment. An assessment-intervention model summarizes this paper and suggests dimensions that compel practitioners to ask questions meriting research attention and providing avenues for developments of culturally competent practice.

The Status of Psychiatric Research

1962 ◽  
Vol 7 (4) ◽  
pp. 156-156
Author(s):  
C. SHAGASS
Keyword(s):  
Psychiatric Research ◽  
The Status
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