Induction of conjugation in Mougeotia

1989 ◽  
Vol 67 (7) ◽  
pp. 2217-2218 ◽  
Author(s):  
H. Stabenau ◽  
W. Säftel
Keyword(s):  
Sexual Reproduction ◽  
Growth Medium ◽  
Nitrogen Supply ◽  
Sexual Process ◽  
University Of Göttingen ◽  
The University

The alga Mougeotia, strain 164.80, from the algae collection of the University of Göttingen, can be stimulated into sexual reproduction by decreasing the concentration of nitrate in the growth medium from 10−2 to 10−3 M. This effect could not be observed at any other concentration. To initiate the sexual process, cultures were illuminated with an intensity of 550 foot candles. Aeration of the cultures was absolutely necessary. Conjugation started 6 or 9 days after limitation of the nitrogen supply, depending on the CO2 content in the aeration mixture. From the characteristics observed during conjugation, strain 164.80 was identified to be Mougeotia scalaris Hassall.

The impact of publications in core public choice journals: an analysis of institution rankings

2021 ◽  
Author(s):  
Franklin G. Mixon ◽  
Kamal P. Upadhyaya
Keyword(s):  
Public Choice ◽  
University Of Illinois ◽  
Oxford University ◽  
University Of Oxford ◽  
University Of Cambridge ◽  
Emory University ◽  
University Of Göttingen ◽  
The University ◽  
The Impact ◽  
Published Research

This study examines the impact of research published in the two core public choice journals – Public Choice and the Journal of Public Finance and Public Choice – during the five-year period from 2010 through 2014. Scholars representing almost 400 universities contributed impactful research to these journals over this period, allowing us to rank institutions on the basis of citations to this published research. Our work indicates that public choice scholarship emanating from non-US colleges and universities has surged, with the University of Göttingen, University of Linz, Heidelburg University, University of Oxford, University of Konstanz, Aarhus University, University of Groningen, Paderborn University, University of Minho and University of Cambridge occupying ten of the top 15 positions in our worldwide ranking. Even so, US-based institutions still maintain a lofty presence, with Georgetown University, Emory University, the University of Illinois and George Mason University each holding positions among the top five institutions worldwide.

Bernhard Riemann’s legacy of 1859

2009 ◽  
Vol 93 (528) ◽  
pp. 468-475
Author(s):  
Graham Hoare
Keyword(s):  
Number Theory ◽  
Mathematical Physics ◽  
Point Of View ◽  
German Version ◽  
Profound Impact ◽  
Almost All ◽  
University Of Göttingen ◽  
The University ◽  
Modern Mathematics ◽  
Mathematics And Physics

The German version of Riemann’s Collected Works is confined to a single volume of 690 pages. Even so, this volume has had an abiding and profound impact on modern mathematics and physics, as we shall see. In fifteen years of activity, from 1851, when he gained his doctorate at the University of Göttingen, to his death in 1866, two months short of his fortieth birthday, Riemann contributed to almost all areas of mathematics. He perceived mathematics from the analytic point of view and used analysis to illuminate subjects as diverse as number theory and geometry. Although regarded principally as a mathematician Riemann had an abiding interest in physics and researched significantly in the methods of mathematical physics, particularly in the area of partial differential equations.

scholarly journals Botany at the University of Göttingen

1888 ◽  
Vol 13 (11) ◽  
pp. 287-294
Author(s):  
W. E. Stone
Keyword(s):  
University Of Göttingen ◽  
The University

Books Borrowed by Coleridge from the Library of the University of Göttingen, 1799

1928 ◽  
Vol 25 (3) ◽  
pp. 377-380 ◽  
Author(s):  
Alice D. Snyder
Keyword(s):  
University Of Göttingen ◽  
The University

The New President of the National Council of Teachers of Mathematics

1932 ◽  
Vol 25 (5) ◽  
pp. 298-299
Keyword(s):  
High School ◽  
National Council ◽  
Foundations Of Geometry ◽  
Original Intention ◽  
Family Tradition ◽  
Short Period ◽  
Strenuous Work ◽  
Young Teacher ◽  
University Of Göttingen ◽  
The University

Mr. William Betz, the new President of the National Council, comes from a family in which teaching has been the principal occupation for four generations. True to this family tradition, he began to teach while still in his teens. Having majored in the classics, it was his original intention to devote his life to the teaching of Latin and Greek. The fates led him along a different path. The first position which was offered to him was that of a “supply” teacher in mathematics in the Rochester High School from which he was graduated. Somehow, he never got away from mathematics after that. An apprenticeship service of a comparatively short period seemed sufficient to convince Principal A. H. Wilcox that it was safe to appoint this young man as head of the department of mathematics in the East High School. Years of strenuous work became necessary. Three European trips gave to the young teacher a first-hand acquaintance with schools abroad and enabled him to get a personal glimpse of the influence of such leaders as Prof. Felix Klein at the University of Gottingen. Several years of postgraduate study were devoted primarily to the foundations of geometry and to applied work in physics.

Convolutriloba macropyga sp. nov., an uncommonly fecund acoel (Acoelomorpha) discovered in tropical aquaria

Zootaxa ◽  
2007 ◽  
Vol 1525 (1) ◽  
pp. 1-17 ◽  
Author(s):  
THOMAS SHANNON ◽  
JOHANNES G. ACHATZ
Keyword(s):  
New Species ◽  
Sexual Reproduction ◽  
Total Darkness ◽  
Temperature Range ◽  
University Of Georgia ◽  
Frontal Organ ◽  
Algal Endosymbiont ◽  
The University ◽  
A New Species ◽  
Extremes Of Temperature

A new species of Convolutriloba Hendelberg & Akesson, 1988, collected from an aquarium in Marietta, Georgia, USA, and cultured at the University of Georgia comprises exceptionally large individuals, up to 10 mm in length. Like other members of the genus, Convolutriloba macropyga sp. nov. reproduces asexually and possesses symbiotic zoochlorellae, but it also routinely reproduces sexually, laying relatively large eggs that hatch into aposymbiotic juveniles with a statocyst and frontal organ ( which are absent in the adults). C. macropyga has a narrow tolerance for extremes of temperature and salinity: it cannot survive outside of a temperature range of 18–28 degrees C and suffers 50% lethality at salinity as low as 24 ppt and as high as 44 ppt. It cannot survive total darkness for longer than 23–26 days, even with prey provided, suggesting an obligate symbiosis with its algal endosymbiont. A method for inducing sexual reproduction in other convolutrilobids is presented, as are suggestions for successful shipping of these acoels.

scholarly journals Pioneers in Optics: Ernst Abbe (1840-1905)

2009 ◽  
Vol 17 (1) ◽  
pp. 38-41
Author(s):  
Michael W. Davidson
Keyword(s):  
Nineteenth Century ◽  
Optical Microscopy ◽  
Graduate School ◽  
German Mathematician ◽  
And Mathematics ◽  
University Of Göttingen ◽  
The University

Ernst Abbe was a brilliant German mathematician and physicist who made several of the most important contributions to the design of lenses for optical microscopy. As a young boy, Abbe lived in an impoverished family where his father labored 16 hours a day to provide for his wife and children. Abbe worked his way through school by earning scholarships and with the help of his father's employer.Abbe studied physics and mathematics as an undergraduate at the University of Jena and went to graduate school at the University of Göttingen, where he received a doctorate in thermodynamics. In 1863 Abbe joined the faculty at the University of Jena where he taught physics. He met Carl Zeiss in 1866 and became very interested in the optical problems surrounding mid-nineteenth century microscopy.

scholarly journals From San Francisco to Tōhoku – 111 yr of continuous earthquake recording in Göttingen

2014 ◽  
Vol 5 (1) ◽  
pp. 1-10
Author(s):  
H. Steffen ◽  
W. Brunk ◽  
M. Leven ◽  
U. Wedeken
Keyword(s):  
Cultural Heritage ◽  
San Francisco ◽  
Historic Buildings ◽  
The Public ◽  
Scientific Investigations ◽  
History Of ◽  
University Of Göttingen ◽  
The University ◽  
Observational Record ◽  
Almost Continuous

Abstract. In 1902, the so-called Erdbebenhaus (earthquake house) was built in the garden of the Institute of Geophysics of the University of Göttingen to host and protect the very sensitive and fragile seismographs designed by Emil Wiechert. These instruments were the standard at their time, and they are still in operation today, documenting 111 yr of almost continuous seismological observations. Since 2005, the observatory is owned by the Wiechert'sche Erdbebenwarte Göttingen e.V. (Wiechert's earthquake observatory in Göttingen, registered society). This society aims at extending the observational record and protecting the observatory as a cultural heritage. In this paper we review the history of the observatory in the last 111 yr. Special attention is given to the developments in the last decade, when the observatory and further historic buildings and instruments changed ownership. Due to the efforts by the society, the observatory is still running now and open to the public. In addition, it is a part of the German Regional Seismic Network and, thus, observations can be used for scientific investigations.

scholarly journals Academic mobility implementation programs at the University of Groningen

2020 ◽  
pp. 46-51
Author(s):  
Natalia A. Gurova
Keyword(s):  
Organizational Structure ◽  
Academic Mobility ◽  
University Of Göttingen ◽  
The University ◽  
Distinguishing Features

The article deals with the programs for the implementation of academic mobility of students of the Dutch University of Groningen, in particular the U4 network, which provides cooperation between leading universities in Europe, such as the University of Ghent, the University of Groningen, the University of Göttingen, and Uppsala University. The organizational structure of cooperation within the framework of the U4 program is considered, the distinguishing features of this organization are highlighted. The statistics of outgoing academic mobility of students of the University of Groningen 2014–2017 are also provided.

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