Surface photometry and radial color gradients of nearby luminous early-type galaxies in SDSS Stripe 82

We make use of the images from the Sloan Digital Sky Survey Stripe 82（Stripe 82） to present an analysis of r band surface brightness profiles and radial color gradients（g-r,u-r） in our sample of 111 nearby early-type galaxies（ETGs） .Thanks to the Stripe 82 images,each of which is co-added from about 50 single frames,we are able to pay special attention to the low-surface-brightness areas（LSB areas） of the galaxies.The LSB areas affect the Sérsic fittings and concentration indices by making both of the indices less than the typical values for ETGs.In the Sérsic fits to all the surface brightness profiles,we found some Sérsic indices that range from 1.5 to 2.5,much smaller than those of typical de Vaucouleur profiles and relatively close to those of exponential disks,and some others much larger than four but still with accurate fitting.Two galaxies cannot be fitted with a single Sérsic profile,but once we try double Sérsic profiles,the fittings are improved：one with a profile relatively close to the de Vaucouleur law in the inner area and a profile relatively close to an exponential law in the LSB area,the other with a nice fitting in the inner area but still having a failed fitting in the outer area.About 60%of the sample has negative color gradients（red-core） within 1.5Re,much more than the approximately 10%positive ones（blue-core） within the same radius.However,taking into account the LSB areas,we find that the color gradients are not necessarily monotonic：about one third of the red-core（or blue-core） galaxies have positive（or negative） color gradients in the outer areas. So LSB areas not only make ETGs’Sérsic profiles deviate from de Vaucouleur ones and shift to the disk end,but also reveal that quite a number of ETGs have opposite color gradients in inner and outer areas.These outcomes remind us of the necessity of double-Sérsic fitting.These LSB phenomena may be interpreted by mergers and thus have different metallicity in the outer areas.Isophotal parameters are also discussed briefly in this paper with the following conclusion：there are more disky nearby ETGs that are identified than boxy ones.

Portal hemodynamics in cirrhotics with portal hypertension using color Doppler velocity profile

Objective To investigate portal hemodynamics and its correlation with e sophageal variceal bleeding (EVB) in cirrhotics with portal hypertension by usin g a newlydeveloped technique, color Doppler velocity profile (CDVP) Methods Hemodynamics of portal trunk (PT), right anterior branch (RAB) and splenic vein (SV) were evaluated in 48 cirrhotics with portal hypertension a nd 35 normal volunteers by CDVP The parameters included maximum crosssection a l velocity (CSVmax), flow volume, congestion index (CI), profile parameter N a nd pattern of flow curve Stepwise logistic regression model was employed to de termine EVBrelating factors in cirrhotics Results CSVmax in PT and RAB was significantly lower in cirrhotic gro up than that of normal group, being 1491308?cm/s, 944270?cm/s vs 3 052 675?cm/s, 1282269?cm/s, respectively ( P <001 for both) Fl ow volume of PT and SV was significantly higher in cirrhotic group compared with that of normal group, being 25161048?mlmin1kg1, 15 8 3918?mlmin1kg1 vs 2043557?mlmin1kg 1, 581 204?mlmin1kg1, respectively ( P <001 for bo th) C I of PT,RAB and SV was significantly higher in cirrhotic group than in normal gr oup, being 014200654, 010500496, 0088400431 vs 003260014 2, 0075 700342, 0048300230, respectively ( P <001 for all) In d ynami c variation of flow volume over time, RAB and SV in cirrhotic group increasingly presented flat pattern and periodically changed pattern, respectively ( P <001 for both) Between cirrhotic subgroups without and with EVB histor y, there were significant differences in flow volume, CI and N value of SV, splenic size, degree of esophageal varices (EV) and portal hypertensive gastropathy (PH G), and stepwise logistic regression revealed that N value of SV, splenic size, degree of EV and PHG were four independent factors in relation to EVB EVB sco r es calculated from the regression equation had a close correlation with EVB I n patients with EVB score>0, 889% of them had EVB, and in those with EVB<0, 76 9% of them had no history of EVB Conclusion In cirrhotics with portal hypertension, portal venous system has the features of elevated vascular resistance and hyperdynamics, and the lat ter mainly results from increased blood flow in SV EVB score may become a val uable parameter in predicting occurrence of EVB