Multiple Distance Functions
Mostrando 1-12 de 15 artigos, teses e dissertações.
-
1. Stochastic texture analysis for measuring sheet formation variability in the industry
Several continuous manufacturing processes use stochastic texture images for quality control and monitoring. Large amounts of pictorial data are acquired, providing important information about both the materials produced and the manufacturing processes involved. However, it is often difficult to measure objectively the similarity among such industrial stocha
Publicado em: 2011
-
2. Reducing the semantic gap content-based image retrieval with similarity queries / Adequando consultas por similaridade para reduzir a descontinuidade semântica na recuperação de imagens por conteúdo
The increasing number of images captured in digital media fostered the developmet of new methods for the recovery of these images. Dissimilarity is a criteria that can be used for image retrieval, where the results are images that are similar to a given reference. The queries are based on feature vectors automatically extracted from the images and on distanc
Publicado em: 2009
-
3. Indexing complex data in Generic Metric Domains. / Indexação de dados em domínios métricos generalizáveis
The DBMS were developed to manipulate data in numeric domains and short strings, not considering the manipulation of complex data, like multimidia data. The operators em data domain which requests for the total order property have no use to handle complex data. An operator class that fit well to handle this type of data are the similarity operators: range qu
Publicado em: 2005
-
4. Synergism between hypersensitive sites confers long-range gene activation by the β-globin locus control region
The human β-globin locus control region (LCR) consists of four erythroid-specific DNaseI hypersensitive sites (HSs) at the 5′ end of the β-globin cluster. The LCR functions over a long distance on chromosome 11 to regulate transcription and replication of the β-globin genes. To determine whether the HSs function independently or as an integrated unit, w
The National Academy of Sciences of the USA.
-
5. Dissecting RNA silencing in protoplasts uncovers novel effects of viral suppressors on the silencing pathway at the cellular level
Short interfering RNA (siRNA)-mediated RNA silencing plays an important role in cellular defence against viral infection and abnormal gene expression in multiple organisms. Many viruses have evolved silencing suppressors for counter-defence. We have developed an RNA silencing system in the protoplasts of Nicotiana benthamiana to investigate the functions of
Oxford University Press.
-
6. Approximate protein structural alignment in polynomial time
Alignment of protein structures is a fundamental task in computational molecular biology. Good structural alignments can help detect distant evolutionary relationships that are hard or impossible to discern from protein sequences alone. Here, we study the structural alignment problem as a family of optimization problems and develop an approximate polynomial-
National Academy of Sciences.
-
7. The relationship between the "TATA" sequence and transcription initiation sites at the HIS4 gene of Saccharomyces cerevisiae.
Transcription of the HIS4 gene begins at a single site (I) at position -60 from the ATG that begins translation. We have made linker insertions/deletions in the 5' noncoding region to identify the elements required for the specificity of transcription initiation. Although there are four sequences that begin TATA and are near the start of transcription (-170,
-
8. Effect of the 21-bp repeat upstream element on in vitro transcription from the early and late SV40 promoters.
The role of the 21-bp repeat region [simian virus 40 (SV40) coordinates 40-103] on early and late SV40 promoter functions has been investigated in vitro using a variety of mutated templates. Using either a HeLa whole cell extract or a S100 extract, we analyzed the transcripts by quantitative S1 nuclease mapping. GC-rich motifs contained in the 21-bp direct r
-
9. Control of transcription processivity in phage lambda: Nus factors strengthen the termination-resistant state of RNA polymerase induced by N antiterminator.
During transcription of phage lambda early operons, the N gene product alters host RNA polymerase (RNAP) so that transcription proceeds through multiple stop signals. Here, we reproduce the essence of N activity with purified components in synthetic transcription units that contain lambda pL promoter and the N-recognition site, nutL, followed by a variety of
-
10. Evidence of a mate-finding cue in the hermaphrodite nematode Caenorhabditis elegans
When males of the roundworm Caenorhabditis elegans come into association with their hermaphroditic counterparts they cease foraging behavior and begin to mate. Here we detail several assays used to demonstrate that a diffusible cue is correlated with this process. This cue is sexually dimorphic, given off only by the hermaphrodite and eliciting a response on
The National Academy of Sciences.
-
11. PromH: promoters identification using orthologous genomic sequences
Accurate prediction of promoters is fundamental for understanding gene expression patterns, cell specificity and development. In the studies of conserved features of regulatory regions of orthologous genes, it was observed that major promoter functional components such as transcription start points, TATA-boxes and regulatory motifs, are significantly more co
Oxford University Press.
-
12. Upstream sequences and cap proximity in the regulation of polyadenylation in ground squirrel hepatitis virus.
The polyadenylation signal of mammalian hepadnaviruses is unusual in that its hexanucleotide element is the variant UAUAAA rather than AAUAAA. This signal functions inefficiently and must be augmented by multiple activator elements located in the upstream 400 nucleotides (nt) to promote efficient processing. Here we characterize one of these upstream element