Ocorrência de Leporinus lacustris Campos, 1945 na bacia do Rio Ibicuí, RS

This paper deals with the finding of Leporinus lacustres Campos, 1945 in the state of Rio Grande do Sul. The samples studied were collected in the Ibicui – Mirim (1982-1983) and Santa Maria (1984-1985) rivers and presented some morphometric and meristic differences when compared to descriptions made by other authors.Este trabalho trata do registro de ocorrência de Leporinus lacustris Campos, 1945 no Estado do Rio Grande do Sul. Os exemplares estudados foram coletados nos Rio ibicuí Mirim (1982-1983) e Santa Maria (1984-1985) e evidenciaram algumas diferenças mo que se refere a dados morfométricos e merísticos quando comparadas com as descrições feitas por outros autores

Leporinus striatus Kner, 1859 da Bacia do Ibicui, RS

Twenty five specimens of fish commonly known as "pocketknife" fish, collected during icthyologic inventory from the basin of the Ibicui River between 1982 and 1985 were studied and recognized as Leporinus striatus Kner, 1859 and theyr meristic and morphometric data compared with the literature.Vinte e cinco exemplares de peixes conhecidos vulgarmente como "canivetes", coletados durante levantamento ictiológico efetuado na Bacia do Ibicui de 1982 a 1985, foram estudados e identificados como Leporinus striatus Kner, 1859 e seus dados merísticos e morfométricos comparados com os da literatura

Estudo sistemático da família Cichlidae na região central do Rio Grande do Sul. I Gêneros: Aequidens, Chichlaurus e Geophagus

Among the specimens of the Cichlidae family collected in the central region of the State of Rio Grande do Sul (Brazil), the initial studies were done in genera represented by orbicular forms, which comprise: Aequidens, Cichlaurus and Geophagus. Of these genera, four species were found in different proportions: Aequidens portalegrensis, Cichlaurus facetus, Geophagus brasiliensis and Geophagus gymnogenys.Entre os exemplares da família Cichlidae, coletados na região central do Rio Grande do Sul, foram estudados inicialmente os géneros representados pelas formas orbiculares: Aequidens, Cichlaurus e Geophagus. Destes gêneros, encontrou-se 4 espécies que ocorreram em proporções bastante variadas: Aequidens portalegrensis, Cichlaurus facetus, Geophagus brasiliensis e Geophagus gymnogenys

Levantamento ictiológico de um trecho dos rios Jacuí e Jacuizinho na área de abrangência da futura barragem de Dona Francisca

The ictiologic survery of the fauna of the Jacuí and Jacuizinho rivers, (RS – Brazil) lead to the identification of twenty species, Astyanax bimaculatus and Astyanax fasciatus and as well as Hemiancistrus sp being more abundant and uniformly distributed during the months of collet while Symbranchus marmoratus and Oligosarchus hepsetus were the more seldom found fishes.O levantamento da fauna ictiológica num trecho dos rios Jacuí e Jacuizinho, R.S., permitiu a identificação de vinte espécies, sendo que os lambaris (Astyanax bimaculatus e Astyanax fasciatus) e os cascudos (Hemiancistrus sp) foram os peixes mais abundantes e de distribuição uniforme nos meses de coleta, enquanto que o mussum (Symbranchus marmoratus) e O tambicu (Oligosarchus hepsetus) foram os de ocorrência mais rara

Automatic evaluation of tumor budding in immunohistochemically stained colorectal carcinomas and correlation to clinical outcome

Background: Tumor budding, meaning a detachment of tumor cells at the invasion front of colorectal carcinoma (CRC) into single cells or clusters (<=5 tumor cells), has been shown to correlate to an inferior clinical outcome by several independent studies. Therefore, it has been discussed as a complementary prognostic factor to the TNM staging system, and it is already included in national guidelines as an additional prognostic parameter. However, its application by manual evaluation in routine pathology is hampered due to the use of several slightly different assessment systems, a time-consuming manual counting process and a high inter-observer variability. Hence, we established and validated an automatic image processing approach to reliably quantify tumor budding in immunohistochemically (IHC) stained sections of CRC samples. Methods: This approach combines classical segmentation methods (like morphological operations) and machine learning techniques (k-means and hierarchical clustering, convolutional neural networks) to reliably detect tumor buds in colorectal carcinoma samples immunohistochemically stained for pan-cytokeratin. As a possible application, we tested it on whole-slide images as well as on tissue microarrays (TMA) from a clinically well-annotated CRC cohort. Results: Our automatic tumor budding evaluation tool detected the absolute number of tumor buds per image with a very good correlation to the manually segmented ground truth (R2 value of 0.86). Furthermore the automatic evaluation of whole-slide images from 20 CRC-patients, we found that neither the detected number of tumor buds at the invasion front nor the number in hotspots was associated with the nodal status. However, the number of spatial clusters of tumor buds (budding hotspots) significantly correlated to the nodal status (p-value = 0.003 for N0 vs. N1/N2). TMAs were not feasible for tumor budding evaluation, as the spatial relationship of tumor buds (especially hotspots) was not preserved. Conclusions: Automatic image processing is a feasible and valid assessment tool for tumor budding in CRC on whole-slide images. Interestingly, only the spatial clustering of the tumor buds in hotspots (and especially the number of hotspots) and not the absolute number of tumor buds showed a clinically relevant correlation with patient outcome in our data

Luminous Blue Variable eruptions and related transients: Diversity of progenitors and outburst properties

We present new light curves and spectra for a number of extragalactic optical transients or "SN impostors" related to giant eruptions of LBVs, and we provide a comparative discussion of LBV-like giant eruptions known to date. New data include photometry and spectroscopy of SNe1999bw, 2000ch, 2001ac, 2002bu, 2006bv, and 2010dn. SN2010dn resembles SN2008S and NGC 300-OT, whereas SN2002bu shows spectral evolution from a normal LBV at early times to a twin of these cooler transients at late times. SN2008S, NGC300-OT, and SN2010dn appear to be special cases of a broader eruptive phenomenon where the progenitor star was enshrouded by dust. Examining the full sample, SN impostors have range of timescales from a day to decades, potentially suffering multiple eruptions. The upper end of the luminosity distribution overlaps with the least luminous SNe. The low end of the luminosity distribution is poorly defined, and a distinction between various eruptions is not entirely clear. We discuss observational clues concerning winds or shocks as the relevant mass-loss mechanism, and we evaluate possible ideas for physical mechanisms. Although examples of these eruptions are sufficient to illustrate their diversity, their statistical distribution will benefit greatly from upcoming transient surveys. Based on the distribution of eruptions, we propose that SN1961V was not a member of this class of impostors, but was instead a true core-collapse SNIIn preceded by a giant LBV eruption. (abridged)Comment: 36(!) journal pages, 16 figures. submitted to MNRAS on october 12. coments welcome. updated reference