177,095 research outputs found
Dormancy and germination in wheat embryos: ribonucleases and hormonal control
No full textAcidic and neutral ribonucleases (RNases) were studied in embryos of Triticum durum cv. Cappelli and the effects of
abscisic acid (ABA) and gibberellic acid (GA3) were analysed. RNases activities increased during germination and were
comparable in dormant and non-dormant embryos imbibed for 24 h. ABA generally inhibited ribonucleolytic activities,
while GA3 only affected dormant embryos. To assess whether changes in RNase activities during germination or
following hormonal treatment required new transcriptional or translational action, cycloheximide or cordycepin were
used. The action of inhibitors of acidic RNase activity was found only in non-dormant-embryos. Findings obtained in
the present work concur with a change of the ribonucleolytic pattern in the shift from dormant to non dormant
metabolism
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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Predictive and/or diagnostic significance of serum soluble mesothelin related proteins (SMR) in asbestos-related pleural malignant mesothelioma: Follow-up of a large population of workers previously exposed to asbestos
No full text
Esposizioni extraprofessionali ad amianto e tumori maligni della pleura nell'area di Livorno.
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Nucleolytic enzymes and DNA degradation in aleurone layers of imbibed aged wheat seeds
No full textDuring prolonged storage seeds progressively lose viability and as the rate of ageing is tightly linked to
conditions of storage in this work wheat seeds stored for different periods at different temperatures were used.
Seeds were categorised as viable, non-viable or of intermediate viability. The object was to determine whether
ageing is associated with changes in the activity of RNases and nucleases in the aleurone of wheat seeds. The
aleurone dies during post germination and this death appears to be programmed. As some plant nucleases are
involved in PCD, these enzymes were studied to follow aleurone cell fate during the imbibition of seeds with
different viability and stored at different temperatures. Worth noting was the appearance of a particular Zn2+-
dependent nuclease (p40) and of a DNA ladder pattern on the second day of imbibition for all materials used,
except for viable cold stored seeds, where Zn2+-dependent nuclease and DNA laddering appeared on the fourth
day of imbibition. Results obtained support the correlation between induction of nuclease activities (p40) and
DNA laddering. Ageing was characterised by the same pattern of changes with a more precocious degeneration
in less viable seeds. Cold storage seems to delay the DNA ladder in viable material
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