367 resultados para Uˆnnepi kötet Honti László tiszteletére
Resumo:
A common problem in video surveys in very shallow waters is the presence of strong light fluctuations, due to sun light refraction. Refracted sunlight casts fast moving patterns, which can significantly degrade the quality of the acquired data. Motivated by the growing need to improve the quality of shallow water imagery, we propose a method to remove sunlight patterns in video sequences. The method exploits the fact that video sequences allow several observations of the same area of the sea floor, over time. It is based on computing the image difference between a given reference frame and the temporal median of a registered set of neighboring images. A key observation is that this difference will have two components with separable spectral content. One is related to the illumination field (lower spatial frequencies) and the other to the registration error (higher frequencies). The illumination field, recovered by lowpass filtering, is used to correct the reference image. In addition to removing the sunflickering patterns, an important advantage of the approach is the ability to preserve the sharpness in corrected image, even in the presence of registration inaccuracies. The effectiveness of the method is illustrated in image sets acquired under strong camera motion containing non-rigid benthic structures. The results testify the good performance and generality of the approach
Resumo:
We present a georeferenced photomosaic of the Lucky Strike hydrothermal vent field (Mid-Atlantic Ridge, 3718N). The photomosaic was generated from digital photographs acquired using the ARGO II seafloor imaging system during the 1996 LUSTRE cruise, which surveyed a ~1 km2 zone and provided a coverage of ~20% of the seafloor. The photomosaic has a pixel resolution of 15 mm and encloses the areas with known active hydrothermal venting. The final mosaic is generated after an optimization that includes the automatic detection of the same benthic features across different images (feature-matching), followed by a global alignment of images based on the vehicle navigation. We also provide software to construct mosaics from large sets of images for which georeferencing information exists (location, attitude, and altitude per image), to visualize them, and to extract data. Georeferencing information can be provided by the raw navigation data (collected during the survey) or result from the optimization obtained from imatge matching. Mosaics based solely on navigation can be readily generated by any user but the optimization and global alignment of the mosaic requires a case-by-case approach for which no universally software is available. The Lucky Strike photomosaics (optimized and navigated-only) are publicly available through the Marine Geoscience Data System (MGDS, http://www.marine-geo.org). The mosaic-generating and viewing software is available through the Computer Vision and Robotics Group Web page at the University of Girona (http://eia.udg.es/_rafa/mosaicviewer.html)
Resumo:
Recently, a handful of intergenic long noncoding RNAs (lncRNAs) have been shown to compete with mRNAs for binding to miRNAs and to contribute to development and disease. Beyond these reports, little is yet known of the extent and functional consequences of miRNA-mediated regulation of mRNA levels by lncRNAs. To gain further insight into lncRNA-mRNA miRNA-mediated crosstalk, we reanalyzed transcriptome-wide changes induced by the targeted knockdown of over 100 lncRNA transcripts in mouse embryonic stem cells (mESCs). We predicted that, on average, almost one-fifth of the transcript level changes induced by lncRNAs are dependent on miRNAs that are highly abundant in mESCs. We validated these findings experimentally by temporally profiling transcriptome-wide changes in gene expression following the loss of miRNA biogenesis in mESCs. Following the depletion of miRNAs, we found that >50% of lncRNAs and their miRNA-dependent mRNA targets were up-regulated coordinately, consistent with their interaction being miRNA-mediated. These lncRNAs are preferentially located in the cytoplasm, and the response elements for miRNAs they share with their targets have been preserved in mammals by purifying selection. Lastly, miRNA-dependent mRNA targets of each lncRNA tended to share common biological functions. Post-transcriptional miRNA-mediated crosstalk between lncRNAs and mRNA, in mESCs, is thus surprisingly prevalent, conserved in mammals, and likely to contribute to critical developmental processes.
Resumo:
A FENNIZMUSOK - Finn szlsok s kifejezsek tra magyarok szmra cm kötet a vilghln a maga nemben ttrnek szmt. Vllalkozsunkkal a finnugrisztika, a finn s a magyar nyelv ismertt ttelt, valamint a nyelvszeti kutatsok forrsainak szabad hozzfrhetsgt tartottuk szem eltt. A gyjtemnyben egyrszt a Suomen kielen perussanakirja (1990) kifejezseit, msrszt a sajt, a tv, a rdi nyelvbl, ill. a mindennapi beszdhelyzetekbl gyjttt legjabb kifejezseket tartalmazza. A szorosabb rtelemben vett kifejezsek mellett felvettnk gyakori, vagy a magyarra nehezen fordthat szkapcsolatokat, ksznsi formkat, stb. is. A Fennizmusok a Veik kissa kielen? Finn-magyar frazeolgiai sztr (Piliscsaba 2000) j, javtott s bvtett kiadsa, amely sok szz j kifejezssel bvlt. A FENNIZMUSOK - Finn szlsok s kifejezsek tra magyarok szmra cm kötetet azzal a cllal bocstjuk tjra vilghln, hogy minl tbb nyelvtanulnak legyen a segtsgre. A kötet msik clja a kontrasztv frazeolgiai kutatsok elmozdtsa.
Resumo:
Lectio praecursoria.
Resumo:
A ocorrncia da infeco pelo Vrus da Leucose Enzotica dos Bovinos (BLV) no Estado do Par, foi estudada atravs do mtodo de imunodifuso em gar-gel (AGID) e por um ensaio imunoenzimatico (ELISA) indireto, paralelamente. Os exames foram realizados com amostras de soros sanguneos oriundos de bovinos de diferentes raas sendo a maioria deles adultos. A prevalncia observada foi de 49,8% (359/721) no ELISA e 26,0% (174/668) no AGID. Todos os 14 grupos dos animais estudados pelo ELISA indireto, mostraram a existncia da infeo, enquanto que pelo mtodo da AGID, dois grupos de animais foram negativos.
Resumo:
Foram examinados 440 soros bubalinos, selecionados em um outro exame de cerca de 1200 amostras sangneas. Utilizaram-se seis diferentes testes sorolgicos para o exame dessas amostras: dois de aglutinao, dois de ELISA indireto e dois de ELISA competitivo. Os animais positivos no ELISA competitivo da FAO/IAEA foram considerados como infectados, e a comparao com os resultados dos outros testes aconteceu neste sentido. A sensibilidade relativa foi de 100%, 98,57%, 97,14%, 91,42% e 79,28%, e a especificidade relativa de 99,33%, 97,33%, 95,66%, 94,00% e 86,33% nas provas de ELISA competitivo, ELISA indireto com conjugado antibovino de cadeia leve (anticorpo monoclonal com HRPO), ELISA indireto com conjugado contra IgG bovino total, teste do antgeno acidificado tamponado e aglutinao rpida, respectivamente. Discute-se o valor dos diferentes testes sorolgicos no diagnstico da brucelose.
Resumo:
Kirjallisuusarvostelu
Resumo:
A common problem in video surveys in very shallow waters is the presence of strong light fluctuations, due to sun light refraction. Refracted sunlight casts fast moving patterns, which can significantly degrade the quality of the acquired data. Motivated by the growing need to improve the quality of shallow water imagery, we propose a method to remove sunlight patterns in video sequences. The method exploits the fact that video sequences allow several observations of the same area of the sea floor, over time. It is based on computing the image difference between a given reference frame and the temporal median of a registered set of neighboring images. A key observation is that this difference will have two components with separable spectral content. One is related to the illumination field (lower spatial frequencies) and the other to the registration error (higher frequencies). The illumination field, recovered by lowpass filtering, is used to correct the reference image. In addition to removing the sunflickering patterns, an important advantage of the approach is the ability to preserve the sharpness in corrected image, even in the presence of registration inaccuracies. The effectiveness of the method is illustrated in image sets acquired under strong camera motion containing non-rigid benthic structures. The results testify the good performance and generality of the approach
