Search results for "Extant taxon"

2013

To estimate the body temperature (BT) of seven dinosaurs Gillooly, Alleen, and Charnov (2006) used an equation that predicts BT from the body mass and maximum growth rate (MGR) with the latter preserved in ontogenetic growth trajectories (BT-equation). The results of these authors evidence inertial homeothermy in Dinosauria and suggest that, due to overheating, the maximum body size in Dinosauria was ultimately limited by BT. In this paper, I revisit this hypothesis of Gillooly, Alleen, and Charnov (2006). I first studied whether BTs derived from the BT-equation of today’s crocodiles, birds and mammals are consistent with core temperatures of animals. Second, I applied the BT-equation to a …

The good, the bad and the ugly – A visual guide for common post-mortem wear patterns in vertebrate teeth

2021

Abstract Dental microwear texture analysis (DMTA) is a common wear proxy using dental wear features to reconstruct diet in extant and extinct taxa. Dietary reconstructions of extinct species can be biased due to post-mortem mechanical modification of the dental surface. These post-mortem surface alterations can be caused by material loss after death, or as the result of burial, excavation, or preparation processes. In this study, we explore post-mortem surface alterations that occur during excavation, preparation, and conservation processes. We present a first general overview of unsuitable and suspicious dental surface scans and describe them both qualitatively and quantitatively using den…

An Annotated History of Craniofacial Surgery and Intentional Cranial Deformation

2001

The history of craniofacial surgery and the use of intentional cranial deformation is a long and varied one. Researching some of the earliest medical writings and reviews of early terracotta and stone figures from throughout the world clearly revealed that these two forms of treatment were widely extant. Intentional cranial deformation was used for a number of reasons including beautification, tribal identification, and social stature. The development of craniofacial surgery is a more modern practice and its historical evolution is reviewed in the context of techniques and the personalities involved.

Line Identification of Atomic and Ionic Spectra of Holmium in the Near-UV. II. Spectra of Ho ii and Ho iii

2017

Fourier Transform spectra of holmium (Ho) in the UV spectral range from 31,530 to 25,000 cm−1 (317 to 400 nm) have been investigated, particularly focusing on the ionic lines. The distinction between the different degrees of ionization (I, II, and III) is based on differences in signal-to-noise ratios from two Ho spectra, which have been measured with different buffer gases, i.e., neon and argon. Based on 106 known Ho ii and 126 known Ho iii energy levels, 97 lines could be classified as transitions of singly ionized Ho and 9 lines could be classified as transitions of doubly ionized Ho. Of the 97 Ho ii lines, 6 have not been listed in the extant literature. Another 215 lines have been assi…

Osservazioni preliminari sulla tassonomia e la biogeografia di Microtus (Terricola) (Mammalia, Rodentia) fossile della Sicilia

2011

Biogeographia vol. )O(X - 2011 (Pubblicato il 23 dicembre 2011) La Biogeografia del/a Sicilia Osservazioni preliminari sulla tassonomia e la biogeografia di Micmtus (Terricola) (Mammalia, Rodentia) fossile della Sicilia ELISA LOCATELLP‘, FEDERICO MASINl**, DARIA PETRUSO**, BENEDETTO SALA*, GIOVANNI SURDI** * Dzpartimento di Biologzkz ed E2/oluzione, Univerritd degli Studi, 6.50 Ercole I d’Este 32, 44100 Fermm (Italy); e—mzzz'[: eZim.[ocate[[z'@unzfi. it; benedettoyzla @umfe. it *q‘ Dzpzzrtimento di Scienze dellzz Yerm e delMare, Universitzi degli Studi, z1z'czArc/Jimfi 22, 90123 Palermo (Italy) e—mai[: federico. masini @unz]m. it; dzzrizz._petru5o @um;mz. it; gz'0wmnz'.:um&#…

Historicizing Divergence: A Comparative Analysis of the Revolutionary Crises in Russia and Finland

2016

Beginning 1917, Russia and Finland both experienced revolutionary situations, the seizure of power by radical political groups, and civil wars. However, the ultimate outcomes of the revolutionary crises in the two countries turned out to be different: the Russian Bolsheviks won the struggle for power whereas the Finnish Red Guard suffered a defeat. Why did the radical socialists win in Russia but lose in Finland? This chapter argues that the Russian revolutionaries benefited from the existence of two coalition alliances that had not fully materialized in Finland: the workers–soldiers’ alliance, which was critical for the radicals’ seizure of power, and the workers–peasants’ alliance, which …

In the Eye of the Beholder: How Regulatory Focus and Self-Efficacy Interact in Influencing Opportunity Recognition

2012

Although there is evidence that regulatory focus is associated with opportunity exploitation, there is a lack of research examining its role at the early stages of opportunity recognition. The present study makes two major contributions to address this gap. First, we demonstrate that entrepreneurs' promotion focus is positively related to opportunity recognition, whereas prevention focus is not significantly related to opportunity recognition. Second, integrating two theories of self-regulation – regulatory focus theory and self-efficacy theory – our findings reveal that a high promotion focus compensates for entrepreneurs' low levels of creative and entrepreneurial self-efficacy in opportu…

Sexual dimorphism in primates: Where are we and where do we go from here?

1986

There are currently several debates taking place in palaeoanthropological circles in which the issue of sexual dimorphism is crucial. During the 60th Jubilee of the discovery of the TaungAustralopithecus skull, the authors concurred that much of the debate was due to differences in perception concerning dimorphism, and it was suggested that a study session dealing principally with sexual dimorphism in Primates should be organised with a view to determining what, if anything, could be observed in extant primates that might be utilised for determining the existence of dimorphism in fossil species. An advertisement was placed in the Journal of Human Evolution, calling for papers. Response was …

Customer-related social stressors and service providers' affective reactions

2012

Summary Previous research has shown that customer-related social stressors (CSS) have negative effects on service providers' long-term well-being. Little is known, however, about short-term and mid-term affective stress reactions and reciprocal effects between service providers' affect and CSS. The aim of this study was to expand extant research (i) by analyzing service providers' short-term (across a day) and mid-term (across 2 weeks) affective reactions to perceived CSS; (ii) by analyzing intraindividual as well as interindividual effects; and (iii) by investigating reciprocal effects of affective reactions and CSS that may eventually lead to psychosocial cycles. Our study employed a diar…

The Structural Variety and Metabolism of Proteins

1994

Individual eukaryote cells contain in the order of 104 different proteins, and each animal species contains an even greater number due to differences between the tissues of an individual and between the individuals themselves; furthermore, the protein spectrum changes during the course of development. The number of different proteins to be found in extant organisms may be as high as 1012. The description of this variety, its origin and biological significance is the most extensive theme in comparative biochemistry. This chapter will concern itself with the possibilities for structural variation and the general metabolism of proteins; further chapters will deal with comparative studies of in…