Shufeldt's Studies of Fossil Birds Review of the Fossil Fauna of the Desert Region of Oregon, with a Description of Additional Material Collected There R. W. Shufeldt Further Studies of Fossil Birds with Descriptions of New and Extinct Species R. W. Shufeldt

The Auk ◽  
1913 ◽  
Vol 30 (4) ◽  
pp. 597-598
Keyword(s):  
Fossil Birds ◽  
Additional Material ◽  
Extinct Species ◽  
Desert Region

NEW ASILID FLIES OF THE GENUS ABLAUTUS WITH A KEY TO THE SPECIES

1935 ◽  
Vol 67 (10) ◽  
pp. 222-227 ◽  
Author(s):  
J. Wilcox
Keyword(s):  
Sandy Soil ◽  
Arid Regions ◽  
Sandy Desert ◽  
The West ◽  
Additional Material ◽  
Desert Region ◽  
Superficial Resemblance ◽  
Robber Flies

Three of the species of Ablautus Loew described here have been on hand for several years and, as no additional material has become available, there seems to be no reason for delaying their description longer. These small robber flies inhabit the more arid regions of the West and Southwest and seem to prefer sandy localities in the sage brush. Osten Sacken commented on the fact that Ablautus mimus O. S. was associated with Lestomyia sabulonum O. S. on sandy soil and seems to mimic it; and Melander says, regarding Cyrtopogon ablautoides Mel., “The species presents a curious superficial resemblance to Ablautus mimus O. S., with which it is associated in the sandy desert region.”

Continuity of homotopies

2017 ◽  
Author(s):  
Ehud Hrushovski ◽  
François Loeser
Keyword(s):  
Open Subset ◽  
Small Neighborhood ◽  
Unit Vector ◽  
Zariski Topology ◽  
Simple Point ◽  
Smooth Variety ◽  
Additional Material ◽  
Generic Type ◽  
Zariski Open Subset

This chapter includes some additional material on homotopies. In particular, for a smooth variety V, there exists an “inflation” homotopy, taking a simple point to the generic type of a small neighborhood of that point. This homotopy has an image that is properly a subset of unit vector V, and cannot be understood directly in terms of definable subsets of V. The image of this homotopy retraction has the merit of being contained in unit vector U for any dense Zariski open subset U of V. The chapter also proves the continuity of functions and homotopies using continuity criteria and constructs inflation homotopies before proving GAGA type results for connectedness. Additional results regarding the Zariski topology are given.

Structure and Dynamics of Crucians’ Settlements (Cypriniformes, Carassius) in Water Systems of Eastern Ukraine

2019 ◽  
Vol 53 (4) ◽  
pp. 269-284
Author(s):  
S. V. Mezhzherin ◽  
A. V. Kulish ◽  
S. V. Kokodiy
Keyword(s):  
Species Composition ◽  
Retrospective Analysis ◽  
Crucian Carp ◽  
Water Systems ◽  
Museum Collections ◽  
Numerous Species ◽  
Extinct Species ◽  
Structure And Dynamics ◽  
Competitive Relations

Abstract The analysis of present-day crucians’ settlements in water systems of Eastern Ukraine designated the predominance of the digeneous Goldfish, C. auratus, in the region, the number of which made 78.7 %, from the total number of the examined representatives of the genus. The second group consists of gynogenetic Prussian carps, C. gibelio (14.3 %); it is represented by the clone biotype and recombinant individuals. Crucian carp, C. carassius (3.6 %), turned out to be rare and its number did not exceed the number of the caught hybrids C. auratus × C. carassius (3.4 %). The retrospective analysis of literature data and museum collections gave an opportunity to describe the changes in species composition of the genus which took place during the last 150 years. Within this period the crucian carp, which used to be the single and most common representative of genus Carassius (Jarocki, 1822) in the region, became nearly an extinct species. In the meanwhile the representatives of the group of species of Prussian carps, C. auratus + C. gibelio, which appeared in the region in the late 1960s, rapidly increased their number and became the most numerous fish of the Eastern Ukraine. The discovered tendency is not unique for the researched region; in general it reflects the European tendency for the crucian species. The reasons for that are rivers’ regulation and destruction of bottomland ecosystems. The secondary factors for the elimination of C. carassius are the competitive relations of individuals representing both species and easy hybridization, during which the more numerous species C. auratus absorbs the rare C. carassius.

THE CONTRIBUTION OF THE PEOPLE OF UZBEKISTAN IN THE VICTORY OF OVER FASCISM IN THE SECOND WORLD WAR

2020 ◽  
Vol 2 (3) ◽  
pp. 4-11
Author(s):  
Dilorom Bobojonova ◽  
Keyword(s):  
World War Ii ◽  
Second World War ◽  
World War ◽  
Additional Material ◽  
Historical Aspect ◽  
The People ◽  
Second World

In this article, the author highlights the worthy contribution of the people of Uzbekistan, along with other peoples, to the victory over fascism in World War II in a historical aspect. This approach to this issue will serve as additional material to previously published works in international scientific circles

The Vascular Structure of the Kidney of Mallards and Doves

1999 ◽  
Vol 5 (S2) ◽  
pp. 1192-1193
Author(s):  
H. Ditrich
Keyword(s):  
Vascular System ◽  
Venous Drainage ◽  
Portal System ◽  
Physiological Data ◽  
Vascular Structure ◽  
Serial Sections ◽  
Functional Importance ◽  
Additional Material ◽  
Functional Studies ◽  
Primitive Feature

The architecture of the kidney of birds (and also reptiles) is, unlike in mammalians, mainly determined by the organization of the blood vascular system. Besides arterial supply and venous drainage, the renal portal system forms a main structural component. While the latter was often regarded as a “primitive” feature in the literature, morphological and physiological data reveal its great functional importance.Microvascular corrosion casts studied in the scanning electron microscope permit the visualization of minute vessels, retaining their 3D-arrangement. Additionally, when compared with graphical reconstructions of serial sections, this method avoids several inherent artifacts like fixation and dehydration shrinkage as well as the compression of the object by the sectioning blade. Most of the studies on avian kidneys with this technique used the domestic chicken as a model. In order to provide additional material for comparative and functional studies, data on the intrarenal vascular structure of other species are required.

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