36,085 research outputs found
Introduction of Neottia nidus-avis (L.) Rich. into culture in vitro
No full textCallus cultures from ovary and ovule of Neottia nidus-avis (L.) Rich. were obtained. Dependence of callus genesis on growth regulators composition of nutrient medium it was shown. Cytomorphological analysis of callus cultures demonstrat their high morphogenetic potential
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Role of phytolectin in the life cycle of plants
No full textIn the review the basic properties of plant lectins and their physio- logical role in the life cycle of plants are considered. There are data on the current state of the researches of phytolectins and lectin-like pro- teins as well as designation of the main directions of further study on the functioning of these proteins in the plant physiological processes.N. V. Kovalchuk, N. M. Melnykova, L. I. Musatenk
Les biblioteques universitàries i el suport a la recerca
No full textThe European Higher Education Area and the European Research Area are currently two key objectives for university learning, teaching and research in all European universities. University libraries must meet the challenges by offering the best library services to the academic community. In drafting the second strategic plan, Rebiun (Network of University Libraries) gathered comments and suggestions from professionals in Spanish university libraries. This article presents the reflections and suggestions contributed by the author regarding the support services that university libraries could offer for university research.L'espai europeu d'educació superior i l'espai europeu d'investigació són actualment dos objectius clau per a l'aprenentatge, la docència i la recerca de totes les universitats europees. Les biblioteques universitàries han de contribuir a aquests reptes, oferint els millors serveis bibliotecaris a la comunitat acadèmica. En la fase d'elaboració del seu segon Pla estratègic, la REBIUN (Red de Bibliotecas Universtarias) va recollir reflexions i suggeriments de diferents professionals de les biblioteques universitàries de l'Estat espanyol. En l¿article següent es presenten les reflexions i els suggeriments aportats per l'autora sobre el suport que les biblioteques universitàries poden oferir a la recerca universitària
Letter from Carl Hayden to L. L. Ferrall, Postmaster at Grand Canyon
No full textLetter from Carl Hayden to L. L. Ferrall on the favorable conditions for creating a national park and the prospect of the United States entering WW I
Темпы роста изолятов Aspergillus niger L. из контрастных условий существования
No full textEighteen strains of filamentous fungus Aspergillus niger were isolated from contrasting environments in Israel: the hypersaline Dead Sea and the temperate «Evolution Canyon» I. A comparison of growth rates under different water activity stress was provided. Clear differences in growth rates were observed under 5—20 % and 40 % volumes of the Dead Sea water (DSW). No difference was observed when we used 25— 35 % volumes of DSW. Strains from «Evolution Canyon» I grown at lower concentrations of the DSW revealed higher growth rates, while strains from the DSW demonstrated higher activity under higher stress (40 % volumes of DSW). Therefore, the following conclusion can be made: strains of A. niger isolated from the DSW are more adapted to stress associated with low-water activity.Сравнение темпов роста спор изолятов Aspergillus niger L. из контрастных по солености условий существования: гиперсоленых — Мертвого моря и умеренных — Европейского и Африканского склонов "Эволюционного каньона" (Израиль) дало возможность сделать вывод о большой адаптированности спор изолятов A. niger, выделенных из воды Мертвого моря, к стрессу, ассоциированному с низкой активностью воды.Порівняння темпів росту ізолятів Aspergillus niger з контрастних умов існування: гіпер-солоних — Мертвого моря і помірних — "Еволюційного каньйону" (Ізраїль) дало можливість дійти висновку про більшу адаптованість ізолятів A. niger, виділених з води Мертвого моря, до стресу, асоційованого з низькою активністю води
The synthesis of monodisperse alkanes with long chains
No full textThis thesis discusses reasons for the interest in monodisperse long chain alkanes and describes attempts, past and present, to synthesise such molecules. Chapter 1 discusses why the synthesis of such molecules are important and the objectives of this project. Chapter 2 reviews the methods previous groups have devised to prepare pure samples of long chain alkanes. In particular, work carried out by Whiting et al. at Bristol, whose scheme formed the basis of the early work in Durham. Chapter 3 describes the work in Durham and improvements which were made to Whiting's method, allowing the synthesis of longer chain lengths and greater quantities of materials to be achieved. Chapter 4 provides a summary of the practical work carried out by the author. Chapter 5 gives experimental details of the work described in Chapter 4
La Scala de Contemplació, de Fra Antoni Canals, i el De XV gradibus contemplationis o Viridiarium Ecclesiae
No full textA partir de les paraules de Roig i Gironella i de Robles sobre l' originalitat de la Scala de Contemplació d' Antoni Canals, l' autor comprova factualment la dependència total que manté aquest text amb el tractat llatí pseudobonaventurià contingut al ms. París, Mazarine 961, mitjançant la confrontació dels pròlegs, dels epílegs i d' alguns capítols.On the basis of Roig i Gironella and Robles 'words on the originality of Antoni Canals' Scala de contemplació, the author demonstrates factually this text's dependence on the pseudo-Bonaventurian Latin treaty to be found in ms. Paris, Mazarine 961. He does so by comparing the prologues, epilogues and some chapters
Темпы роста изолятов Aspergillus niger L. из контрастных условий существования
No full textEighteen strains of filamentous fungus Aspergillus niger were isolated from contrasting environments in Israel: the hypersaline Dead Sea and the temperate «Evolution Canyon» I. A comparison of growth rates under different water activity stress was provided. Clear differences in growth rates were observed under 5—20 % and 40 % volumes of the Dead Sea water (DSW). No difference was observed when we used 25— 35 % volumes of DSW. Strains from «Evolution Canyon» I grown at lower concentrations of the DSW revealed higher growth rates, while strains from the DSW demonstrated higher activity under higher stress (40 % volumes of DSW). Therefore, the following conclusion can be made: strains of A. niger isolated from the DSW are more adapted to stress associated with low-water activity.Сравнение темпов роста спор изолятов Aspergillus niger L. из контрастных по солености условий существования: гиперсоленых — Мертвого моря и умеренных — Европейского и Африканского склонов "Эволюционного каньона" (Израиль) дало возможность сделать вывод о большой адаптированности спор изолятов A. niger, выделенных из воды Мертвого моря, к стрессу, ассоциированному с низкой активностью воды.Порівняння темпів росту ізолятів Aspergillus niger з контрастних умов існування: гіпер-солоних — Мертвого моря і помірних — "Еволюційного каньйону" (Ізраїль) дало можливість дійти висновку про більшу адаптованість ізолятів A. niger, виділених з води Мертвого моря, до стресу, асоційованого з низькою активністю води
Nuclis temàtics per a una geografia crítica: les propostes de D.R. Stoddart i D. Harvey
No full textL�autor introdueix el concepte de geografia crítica i comenta dues reflexions sobre la geografia.
Les aportacions de D. R. Stoddart a Berkeley el 1986 i D. Harvey a Heidelberg el 2004. Llurs
propostes propugnen una geografia crítica compromesa amb el coneixement i amb la solució dels
problemes ambientals i socials del seu temps.The author introduces the concept of critical geography and discusses two reflections on geography.
The contributions of D. R. Stoddart at Berkeley in 1986 and D. Harvey at Heidelberg in
2004. Their proposals advocate a critical geography committed with the knowledge and the solution
of environmental and social problems of his time
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