Advances in the phylogenesis of Agaricales and its higher ranks and strategies for establishing phylogenetic hypotheses     

Zhao RL  Desjardin DE  Soytong K  Hyde KD 《Journal of Zhejiang University. Science. B》2008,9(10):779-786

We present an overview of previous research results on the molecular phylogenetic analyses in Agaricales and its higher ranks (Agaricomycetes/Agaricomycotina/Basidiomycota) along with the most recent treatments of taxonomic systems in these taxa. Establishing phylogenetic hypotheses using DNA sequences, from which an understanding of the natural evolutionary relationships amongst clades may be derived, requires a robust dataset. It has been recognized that single-gene phylogenies may not truly represent organismal phylogenies, but the concordant phylogenetic genealogies from multiple-gene datasets can resolve this problem. The genes commonly used in mushroom phylogenetic research are summarized.  相似文献   

On the problem of determining a citation index of publications by Kazakh scientists     

V. A. Frolova  S. K. Khasenova  T. Sh. Kubieva  O. A. Rog 《Scientific and Technical Information Processing》2008,35(2):104-106

This paper discusses the evaluation of scientific activity with the help of some scientometric indices, in particular, a citation index. The information massif of the bibliographic database of citations to domestic publications of Kazakh authors is statistically described.  相似文献   

Comment & Response     

Matthew James Simon  Mary K. Bolin 《The Journal of Academic Librarianship》2008,34(6):551-552

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Politico-economic interactions of German public performing arts institutions   总被引：2，自引：2，他引：0  

Susanne Krebs  Werner W. Pommerehne 《Journal of Cultural Economics》1995,19(1):17-32

Our paper analyzes the conduct of German public performing arts institutions in terms of non-market decision making or public choice. Apart from consumers of performing arts managers of performing arts institutions and public donors are main agents. A manager of a performing arts institution will not assume that the number of visitors is independent of his institution's programme or the ticket prices. By the same reasoning he will regard the amount of public subsidies not as exogenous, but dependent on his own policy. If future grants depend on present and past success (however defined), this will feed back into managerial decisions, along with expectations about demand. Data for the Federal Republic of Germany serve to empirically support the theoretical argument.  相似文献   

Analysis of the use of reference services in an academic health sciences library     

Sullivan W  Schoppmann LA  Redman PM 《Medical reference services quarterly》1994,13(1):35-55

In 1991, the Reference and Information Services staff of the Alfred Taubman Medical Library at the University of Michigan gathered data on the use of the reference desk, including the frequency and types of assistance requested by different user groups throughout the year. Recommendations based on the results of this study led to improved service as well as more efficient use of staff resources.  相似文献   

The Impact of Museum Purchase on the Auction Prices of Paintings   总被引：1，自引：1，他引：0  

Werner W. Pommerehne  Lars P. Feld 《Journal of Cultural Economics》1997,21(3):249-271

This study examines how art museumspurchasing policy influences the auction prices ofpaintings. Using a cross section of non-speculativetransactions during the period 1820–1970, we findconsiderable empirical support for the hypothesisthat public museums outside the U.S. pay above averageprices in auction markets providing higher thanaverage yields to private sellers. The typical U.S.private museums appear to be more restricted byfinancial constraints and the development of thegeneral economic conditions than their publiccounterparts.  相似文献   

Librarians as liaisons to college curriculum committees     

Francis BW  Fisher CC 《Medical reference services quarterly》1997,16(2):69-74

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UnCover on the Web: search hints and applications in library environments     

Galpern NF  Albert KM 《Medical reference services quarterly》1997,16(3):1-18

Among the huge maze of resources available on the Internet, UnCoverWeb stands out as a valuable tool for medical libraries. This up-to-date, free-access, multidisciplinary database of periodical references is searched through an easy-to-learn graphical user interface that is a welcome improvement over the telnet version. This article reviews the basic and advanced search techniques for UnCoverWeb, as well as providing information on the document delivery functions and table of contents alerting service called Reveal. UnCover's currency is evaluated and compared with other current awareness resources. System deficiencies are discussed, with the conclusion that although UnCoverWeb lacks the sophisticated features of many commercial database search services, it is nonetheless a useful addition to the repertoire of information sources available in a library.  相似文献   

The Future of the Past: Archaeology and Anthropology on the World Wide Web     

John W. Hoopes 《Archives and Museum Informatics》1997,11(2):87-105

In the final scene of Raiders of the Lost Ark, a crate containing the object of Indiana Jones' quest is wheeled into an immense warehouse for indefinite storage and questionable research access. Unfortunately, this fate is not all that far from reality. Collections of archaeological and ethnographic materials ranging from stone axes, broken potsherds, and carved monuments to baskets, ceremonial masks, and skin canoes have been held by museums collections since the Renaissance. However, their inestimable value and unique conservation and curatorial requirements often conspire to remove them from the reach of all but the most diligent scholars. The potential of the Web to enhance the quality of research on archaeological and ethnographic collections is enormous. This paper will examine ways that one can use the Web to enhance research and improve access to a variety of materials; while there are many other resources for archaeology available on the Web, this paper focusses on museum-related sites. It will also explore the potential of the Web for innovative research strategies. Digitization of catalogs, associated documents, and images to help one locate and study collections and specific artifacts are just one approach. Others include the connection of devices to the Web, such as cameras and microscopes, the creation of virtual reference collections, and the establishment of research networks that will enhance the identification and analysis of material culture. This paper will also consider the role the Web could play in issues of cultural property, contributing to and in many ways intensifying ongoing debates of ownership, curation, conservation, and repatriation of sensitive materials.  相似文献   

President's Page     

Matheson NW 《Bulletin of the Medical Library Association》1984,72(1):37

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