External Structure

Entomology ◽  
1995 ◽  
pp. 57-90
Author(s):  
Cedric Gillott
Keyword(s):  
Author(s):  
Barry S. Eckert ◽  
S. M. McGee-Russell

Difflugia lobostoma is a shelled amoeba. The shell is an external structure of considerable mass which presents the animal with special restrictions in cell locomotion which are met by the development of active pseudopodial lobopodia containing, apparently, an organized system of thick and thin microfilaments (Eckert and McGee-Russell, 1972). The shell is constructed of sand grains picked up from the environment, and cemented into place with a secretion. There is a single opening through which lobopods extend. The organization of the shell was studied by scanning electron microscopy (SEM).Intact shells or animals with shells were dried by the critical point method of Anderson (1966) or air dried, after primary fixation in glutaraldehyde.


2007 ◽  
Vol 16 (1) ◽  
pp. 31-32
Author(s):  
D.A. Gapon

Sternodontus contestor is transferred to Oplistochilus on the basis of several common characters of external structure and the male genitalia and absence of real unique characters shared with Sternodontus. The main taxonomic characters of closely related genera are considered.


2020 ◽  
Vol 73 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Lesia Ya. Lopushniak ◽  
Тatiana V. Khmara ◽  
Оleh М. Boichuk ◽  
Mariana A. Ryznychuk ◽  
Leonid V. Shvyhar ◽  
...  

The aim: To study the forms of anatomical variability of the external structure of the upper and lower parathyroid glands in the fetal period of human ontogenesis. Materials and methods: The study involved 48 specimens of human fetuses with 81,0-375,0 mm of crown-rump length (CRL). The study was conducted by means of macromicroscopic preparation, morphometry and variation statistics method. Results: The age and individual anatomical variability, complex way of development and formation of synotopic embryotropographic correlations of the upper and lower parathyroid glands in the prenatal period of human ontogenesis create numerous prerequisites for the emergence of variants of their external structure and topography in the fetuses of both different and the same age groups. Conclusions: There is a significant anatomical variability of the upper and lower parathyroid glands in 4-10-month-old fetuses, which is manifested by varieties of their shape and topical location. Aplasia of the upper parathyroid glands, which was found in two human fetuses aged 7 months, was due to the fetures of their organogenesis and the formation of syntopy in the embryonic and prefetal periods of their development. Parathyroid glands are mainly supplied with blood by the branches of the inferior thyroid artery. The branches of the upper thyroid artery and the arteries of adjacent organs: larynx, trachea and esophagus are involved in the blood supply. The right and left inferior thyroid veins are tributaries of the corresponding brachiocephalic vein, paired (right and left) superior and middle thyroid veins are those for the internal jugular vein.


2018 ◽  
Vol 22 (2) ◽  
pp. 231-249 ◽  
Author(s):  
Jörn Richert

Global energy studies have produced a flurry of empirical analyses. However, the amount of theoretical reflection on the topic remains comparatively low. This article takes two specific limitations of the literature as its starting point: First, the often-unclear relationship between states and markets in global energy governance, and, second, the concept of energy as a material and external structure. With the aim of providing more nuanced perspectives on these issues, the article turns to the work of Niklas Luhmann and Bruno Latour. Luhmann’s ideas of functional differentiation and structural coupling provide a new look at the interaction of states and markets. Latour’s symmetric anthropology allows us to rethink energy as a hybrid that is in the midst of instead of outside society. While these thinkers provide interesting ways forward for global energy studies, they also appear to be utterly incompatible. Instead of accepting this incompatibility, however, the article uses the tension between Luhmann and Latour’s work as a productive resource for further reflection on global energy governance. It develops a ‘Luhtourian’ approach, arguing that hybrid, issue-specific governance systems can emerge whenever a resistant hybrid instigates the emergence of symbolically generalized governance objects.


Author(s):  
Janna V. Gorbyleva

The central topic of this paper is the analysis of the dialectical interdependency of internal and external in the theory of language as a symbolic system. Referring to and analyzing the philosophic legacy of W. von Humboldt, B. Russell, L. Wittgenstein, F. de Saussure and G. Spet, the author concludes that the dialectics of internal and external is not an accidental and episodic phenomenon of language. It rather is an intrinsic, ontological trait apart from which an adequate cognition of the essence of language is impossible. Taking the internal form as a logical structure, it is possible to view it as something "higher and fundamental" in language, something that is attainable more by intuition than by research. The internal intellectual base of this grammatical stability lies in the sphere of purely logical forms. If internal word formulations are related to and governed by the spirit, then the external forms in fact conceal an inner grammatical and syntactic edifice. The laws of external speech functioning are manifested, for example, in bilingualism, which may be viewed either as a social phenomenon related to individual thinking and classificatory abilities or as an evidence of the existence of common verbal structures in human consciousness. The author proposes to transfer such linguistic terms as "bilingualism" and "contamination" into a different context as a way of seeking new topical domains within the linguistic philosophy and the philosophy of language. The empiricism of specific language functioning in the form of bilingual language contamination brings us back to the assumption of the existence of uniform internal metalanguage structures of verbal thinking.


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