186,226 research outputs found
Das Anthropozän ist kein Schicksal, sondern eine Herausforderung: Wirtschaft und Wachstum im Anthropozän
No full textDie Wirtschaft soll ständig wachsen. In Deutschland und überall auf der Welt. Das soll sie zukünftig zwar effizienter und nachhaltiger tun, aber wird das reichen, um die planetaren Grenzen unseres Planeten zu schützen? Es spricht wenig dafür, ist sich Prof. Dr. Kai Niebert sicher, weshalb wir im Anthropozän nicht nur eine ökologischere Wirtschaft brauchen, sondern auch eine neue Idee vom Wachstum
Adding Symmetry Reduction to Uppaal
No full textContains fulltext :
60201.pdf (author's version ) (Open Access
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Efficient siRNA delivery to mammalian cells using layered double hydroxide nanoparticles
No full textAlthough siRNAs have surpassed expectations in experiments to alter gene expression in vitro, the lack of an efficient in vivo delivery system still remains a challenge in siRNA therapeutics development and has been recognized as a major hurdle for clinical applications. in this paper we describe an inorganic nanoparticle-based delivery system that is readily adaptable for in vivo systems. Layered double hydroxide (LDH) nanoparticles, a family of inorganic crystals, tightly bind, protect, and release siRNA molecules and deliver them efficiently to mammalian cells in vitro. The uptake of siRNA-loaded LDH nanoparticles occurs via endocytosis, whereby the nanoparticles dissolve due to the low pH in the endosome, thereby aiding endosomal escape into the cytoplasm. The influence of LDH nanoparticles on cell viability and proliferation is negligible at concentration
Mouse models of colorectal and mammary cancer liver metastases and microenvironmental interplay with tumor-associated macrophages (TAMs)
No full textControlled preparation of layered double hydroxide nanoparticles and their application as gene delivery vehicles
No full textLayered double hydroxides (LDHs) have been known for many decades as catalyst and ceramic precursors, traps for anionic pollutants, catalysts, and additives for polymers, but they recently attracted attention as potential nano-sized carriers for therapeutic/bio-active molecules and genes. Among the many different nanoparticles that have been shown to facilitate gene and/or drug delivery, LDH nanoparticles are particularly well suited for this purpose due to their many desirable properties. In this research Mg2Al(OH)(6)NO3 LDH nanoparticles of varying lateral sizes were synthesized by altering the synthesis conditions. The synthesis conditions particularly influencing the particle size distribution of the LDH suspensions are (a) the temperature during the co-precipitation step and (b) the duration and the temperature of the hydrothermal treatment The association of these nanoparticles with plasmid DNA was studied and it was established that-in contrast to previously published reports-for the plasmid sizes used no significant intercalation occurs. The plasmids wrap around individual particles instead and aggregation of particles is observed. However, due to the observed strong interaction between LDH nanoparticles and DNA, the particles were nonetheless evaluated as transfection agents for mammalian cells. Considerable transfection efficiencies when transfecting adherent cell lines (i.e., HEK293T, NIH 3T3, COS-7, and CHO-K1) were observed, while the transfection of suspension CHO-S cells remained unsuccessful. This is attributed to the formation of aggregates upon DNA-LDH complex formation which settle on top of adherent cells but due to the constant agitation of suspension cultures not on the surface of e.g., CHO-S cells. (C) 2009 Elsevier B.V. All rights reserved
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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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