scholarly journals Frost-acclimation of photosynthesis in overwintering Mediterranean holm oak, grown in Central Europe

2012 ◽  
Vol 3 (1) ◽  
pp. 1 ◽  
Author(s):  
Ellen Pflug ◽  
Wolfgang Brüggemann
Keyword(s):  
Central Europe ◽  
Photosynthetic Apparatus ◽  
Point Of View ◽  
Holm Oak ◽  
Late Winter ◽  
Reaction Centre ◽  
Frost Period ◽  
Near Future ◽  
Chl Fluorescence ◽  
Chronic Photoinhibition

As a consequence of global change, forestry in Central Europe has to expect and be prepared for an increase of hot and dry summers in the near future. In two model plantations of the Mediterranean holm oak (<em>Quercus ilex L</em>.) in Central Europe (Rhine-Main basin) we tested its potential as a future forestry tree for drought-threatened stands by studying its overwintering strategy under harsh winter conditions. During prolonged frost periods, chronic photoinhibition was developed, which lasted until the end of the frost period. Nearly all plants survived minimum temperatures of - 16 to -18°C and their photosynthetic apparatus recovered completely during late winter. A detailed study of the temperature dependence of chlorophyll (chl) fluorescence parameters of the OJIP test revealed statistically significant correlations between minimum temperature and maximum quantum yield of primary photochemistry (Fv/Fm), absorption rate/reaction centre (ABS/RC), dissipation rate/reaction centre (DI0/RC) and electron transport rate/reaction centre (ET0/RC) as well as with the deepoxidation state (DES) of the xanthophyll pigments. The DES correlated with Fv/Fm, ABS/RC, DI0/RC and ET0/RC. It is concluded, that from the point of view of the winter hardiness of the photosynthetic apparatus, <em>Q. ilex </em>should be further investigated as a potential future forestry tree also for very dry and warm stands in Central Europe under the scenarios of climate change.

scholarly journals ALVIC versus the Internet: Redesigning a Networked Virtual Environment Architecture

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Peter Quax ◽  
Jeroen Dierckx ◽  
Bart Cornelissen ◽  
Wim Lamotte
Keyword(s):  
Virtual Environment ◽  
Large Scale ◽  
Virtual Communities ◽  
Real Life ◽  
Point Of View ◽  
The Internet ◽  
Generic Framework ◽  
Short Period ◽  
Networked Virtual Environment ◽  
Near Future

The explosive growth of the number of applications based on networked virtual environment technology, both games and virtual communities, shows that these types of applications have become commonplace in a short period of time. However, from a research point of view, the inherent weaknesses in their architectures are quickly exposed. The Architecture for Large-Scale Virtual Interactive Communities (ALVICs) was originally developed to serve as a generic framework to deploy networked virtual environment applications on the Internet. While it has been shown to effectively scale to the numbers originally put forward, our findings have shown that, on a real-life network, such as the Internet, several drawbacks will not be overcome in the near future. It is, therefore, that we have recently started with the development of ALVIC-NG, which, while incorporating the findings from our previous research, makes several improvements on the original version, making it suitable for deployment on the Internet as it exists today.

Freshwater Ostracods in Holocene Cycle

1972 ◽  
Vol 2 (3) ◽  
pp. 335-336 ◽  
Author(s):  
Adolf Absolon
Keyword(s):  
Central Europe ◽  
Near Future ◽  
Freshwater Ostracods

The present assemblages of Ostracods in Central Europe resemble the assemblages known from the earliest phases of Holocene. This observation supports the view that the termination of the present warm interval is to be expected in the near future.

Gorald Enell. "Stomach ulcers". Library of the Practical Physician, Vol. 30. Giz. 1929, 123 pages, price 1 p.

1929 ◽  
Vol 25 (5) ◽  
pp. 582-583
Author(s):  
R. Luria
Keyword(s):  
Peptic Ulcer ◽  
Central Europe ◽  
Practical Interest ◽  
Living Conditions ◽  
Point Of View ◽  
Made In ◽  
Stomach Ulcers

The author aims to highlight the "peptic ulcer" (Die Magengeschwrkrankheit), its pathology and therapy from the point of view of a therapist. As you know, in addition to very detailed chapters in large manuals, many separate monographs are devoted to this issue (I will name only Yarotsky, Enriquez et Durand, Ruhman, Balint, F. Ramond, Tagepa from recent works), but the enormous practical interest presented by the doctrine of peptic ulcer makes it useful to cover the issue again; especially interesting are the observations made in a country where living conditions are somewhat different than: in central Europe, in Sweden

Issues and Challenges (Privacy, Security, and Trust) in Blockchain-Based Applications

2021 ◽  
pp. 196-209
Author(s):  
Siddharth M. Nair ◽  
Varsha Ramesh ◽  
Amit Kumar Tyagi
Keyword(s):  
Internet Of Things ◽  
Point Of View ◽  
Security And Privacy ◽  
Future Trends ◽  
Security Issue ◽  
Blockchain Technology ◽  
Challenges And Opportunities ◽  
And Control ◽  
Near Future

The major issues and challenges in blockchain over internet of things are security, privacy, and usability. Confidentiality, authentication, and control are the challenges faced in security issue. Hence, this chapter will discuss the challenges and opportunities from the prospective of security and privacy of data in blockchain (with respect to security and privacy community point of view). Furthermore, the authors will provide some future trends that blockchain technology may adapt in the near future (in brief).

The fifth force: An enigma in this Universe

2019 ◽  
Vol 34 (09) ◽  
pp. 1950056 ◽  
Author(s):  
Koijam Manihar Singh ◽  
Kangujam Priyokumar Singh
Keyword(s):  
Theoretical Calculations ◽  
Point Of View ◽  
Theoretical Point ◽  
Experimental Proof ◽  
Fifth Force ◽  
Theory Of Everything ◽  
Discovery Science ◽  
Near Future ◽  
The Universe ◽  
High Hope

In an attempt to explain some of the unknown phenomena of nature, including dark energy and dark matter, we explore the possibility of the existence of a fifth fundamental force of nature as also cited by some researchers. With the inclusion of such a force in the system, some of the vague things can be explained and there is high hope of its importance in building up a “theory of everything”. With this intention, we investigate some manifestations of the fifth force which stand from theoretical calculations or from theoretical point of view, though till now there is less experimental proof. However, the theoretical results obtained indicate the existence of a fifth force which will lead to the completion in defining the laws of physics and nature. With this discovery, science may be able to explain the whole complexity of the Universe in near future.

scholarly journals Can Ceylon Leadwort (Plumbago zeylanica L.) Acclimate to Lead Toxicity?—Studies of Photosynthetic Apparatus Efficiency

2020 ◽  
Vol 21 (5) ◽  
pp. 1866 ◽  
Author(s):  
Krzysztof M. Tokarz ◽  
Wojciech Makowski ◽  
Barbara Tokarz ◽  
Monika Hanula ◽  
Ewa Sitek ◽  
...  
Keyword(s):  
Antioxidant Enzymes ◽  
Photosynthetic Apparatus ◽  
Chloroplast Ultrastructure ◽  
Lead Toxicity ◽  
Protein Accumulation ◽  
Fluorescence Measurement ◽  
Reaction Centre ◽  
Donor Side ◽  
Plumbago Zeylanica ◽  
Pb Concentration

Ceylon leadwort (Plumbago zeylanica) is ornamental plant known for its pharmacological properties arising from the abundant production of various secondary metabolites. It often grows in lead polluted areas. The aim of presented study was to evaluate the survival strategy of P. zeylanica to lead toxicity via photosynthetic apparatus acclimatization. Shoots of P. zeylanica were cultivated on media with different Pb concentrations (0.0, 0.05, and 0.1 g Pb∙l−1). After a four-week culture, the efficiency of the photosynthetic apparatus of plants was evaluated by Chl a fluorescence measurement, photosynthetic pigment, and Lhcb1, PsbA, PsbO, and RuBisCo protein accumulation, antioxidant enzymes activity, and chloroplast ultrastructure observation. Plants from lower Pb concentration revealed no changes in photosynthetic pigments content and light-harvesting complex (LHCII) size, as well as no limitation on the donor side of Photosystem II Reaction Centre (PSII RC). However, the activity and content of antioxidant enzymes indicated a high risk of limitation on the acceptor side of Photosystem I. In turn, plants from 0.1 g Pb∙l−1 showed a significant decrease in pigments content, LHCII size, the amount of active PSII RC, oxygen-evolving complex activity, and significant remodeling of chloroplast ultrastructure indicated limitation of PSII RC donor side. Obtained results indicate that P. zeylanica plants acclimate to lead toxicity by Pb accumulation in roots and, depending on Pb concentration, by adjusting their photosynthetic apparatus via the activation of alternative (cyclic and pseudocyclic) electron transport pathways.

On Ammonites from Spitsbergen

1921 ◽  
Vol 58 (7) ◽  
pp. 297-305 ◽  
Author(s):  
L. F. Spath
Keyword(s):  
Upper Jurassic ◽  
Point Of View ◽  
The Other ◽  
Full Description ◽  
Other Hand ◽  
Preliminary Account ◽  
The Rich ◽  
Invertebrate Fossils ◽  
Near Future

Of the rich collections of fossils made by Professors J. W. Gregory and E. J. Garwood, as members of Sir Martin Conway's expedition to Spitsbergen in 1896, only a few Labyrinthodont remains, so far, have been described; but through the kind offices of Dr. A. Smith Woodward, the writer some time ago was entrusted with the naming of the Cephalopoda in those collections. The Ammonites are of the greatest interest, both from a palæontological and a stratigraphical point of view; and in view of the impossibility of publishing, in the near future, a full description of the fauna, with the necessary number of plates, it is intended to give a short preliminary account of these Cephalopoda. It is matter for regret that other groups of invertebrate fossils, such as the Triassic Pelecypoda, or the Upper Jurassic Aucellids, could not be dealt with, and their detailed study, probably, would yield important results. Spitsbergen Vertebrata, on the other hand, always have received considerable attention.

Does Europe have a centre? Reflections on the history of Western and Central Europe

2006 ◽  
Vol 14 (2) ◽  
pp. 257-268 ◽  
Author(s):  
NICOLETTE MOUT
Keyword(s):  
Cold War ◽  
Central Europe ◽  
Point Of View ◽  
Berlin Wall ◽  
Special Part ◽  
History Of ◽  
English Speaking ◽  
Definition Of ◽  
Separate Identity ◽  
The Cold War

Any definition of Central Europe based on geographical and/or historical facts causes difficulties. The line dividing Europe during the Cold War has a very limited use because it does not take into account Central Europe as a special part of the continent. Historians such as Geoffrey Barraclough, Hugh Seton-Watson and Oskar Halecki discussed the idea of a separate identity of Central Europe during the Cold War. Especially after the fall of the Berlin Wall, this discussion was re-opened. From a historian's point of view, the most important contributions came from Piotr Wandycz and Jenő Szűcs. An imaginary centre of Europe can only be found in the continent's common history.There is a belief, rather widespread in English-speaking countries, that the eastern half of Europe is inhabited by a number of endlessly quarrelling small nations whose conflicts keep endangering the quiet and comfort of Anglophones. (Hugh Seton-Watson)

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