We have constructed new plasmids that can be used to clone transcription terminator containing DNA fragments between the first gene of the tryptophan (trp) operon and the tetracycline resistance (tet) gene. Both genes are under control of the trp promotor. Therefore the presence of a transcription termination signal on cloned fragments can be monitored by a decrease in expression of the tet gen...

In this paper we study the static Einstein–Maxwell space when it is conformal to an n-dimensional pseudo-Euclidean space, which invariant under action of $$(n-1)$$ -dimensional translation group. We also provide a complete classification such space.

Query expansion by pseudo-relevance feedback is a well-established technique in both monoand crosslingual information retrieval, enriching and disambiguating the typically terse queries provided by searchers. Comparable document-side expansion is a relatively more recent development motivated by error-prone transcription and translation processes in spoken document and cross-language retrieval....

Two probabilistic approaches to cross-lingual retrieval are in wide use today, those based on probabilistic models of relevance, as exemplified by INQUERY, and those based on language modeling. INQUERY, as a query net model, allows the easy incorporation of query operators, including a synonym operator, which has proven to be extremely useful in cross-language information retrieval (CLIR), in a...

This paper reports our work on CLEF and CrossLanguage Information Retrieval using CLEF resources. We aim to construct a highly languageindependent CLIR model. To accomplish this objective, several problems must be overcome: text translation or pseudo-translation and merging the obtained results for each language for a given query. Three issues of text-translation are investigated: the impact of...

In the TREC-8 cross-language information retrieval (CLIR) track, we adopted the approach of using machine translation to prepare a source-language query for use in a target-language retrieval task. We empirically evaluated (1) the effect of pseudo relevance feedback on retrieval performance with two feedback vector length control methods in CLIR and (2) the effect of multilingual data merging e...