On the Origins of Starburst and Post-Starburst Galaxies in Nearby Clusters

HST WFPC2 images in B (F450W) and I (F814W) have been obtained for three starburst (SB) and two post-starburst (PSB) galaxies in the Coma cluster, and for three such galaxies in the cluster DC2048-52. V (F555W) and I images for an additional PSB galaxy in Coma have been extracted from the archive. Seven of these galaxies were previously classified as E/S0 on the basis of ground-based images, one as Sa, and the other as an irregular. The HST images reveal these SB/PSB galaxies to be heterogeneous in morphology. Nevertheless a common theme is that many of them, especially the SB galaxies, tend to have centralized spiral structure that appears simply as a bright ``bulge''on ground-based images. In addition, while some PSB galaxies exhibit distinct spiral structure, on the whole they have smoother morphologies than the SB galaxies. The morphologies and luminosity profiles are generally consistent with substantial starbursts in the form of centralized spiral structure (the SB galaxies) which fade into smoother morphologies (the PSB galaxies), with lingering spectroscopic evidence for past central starbursts. An important point is that the PSB galaxies retain disks, i.e, they have not evolved into spheroidal systems.Comment: 32 pages, 10 figures including 3 jpg images. To appear in the January 1999 Astronomical Journa

UBVRI Light Curves of 44 Type Ia Supernovae

We present UBVRI photometry of 44 type-Ia supernovae (SN Ia) observed from 1997 to 2001 as part of a continuing monitoring campaign at the Fred Lawrence Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics. The data set comprises 2190 observations and is the largest homogeneously observed and reduced sample of SN Ia to date, nearly doubling the number of well-observed, nearby SN Ia with published multicolor CCD light curves. The large sample of U-band photometry is a unique addition, with important connections to SN Ia observed at high redshift. The decline rate of SN Ia U-band light curves correlates well with the decline rate in other bands, as does the U-B color at maximum light. However, the U-band peak magnitudes show an increased dispersion relative to other bands even after accounting for extinction and decline rate, amounting to an additional ~40% intrinsic scatter compared to B-band.Comment: 84 authors, 71 pages, 51 tables, 10 figures. Accepted for publication in the Astronomical Journal. Version with high-res figures and electronic data at http://astron.berkeley.edu/~saurabh/cfa2snIa

Robust estimation of bacterial cell count from optical density

Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data

Illinois Hunter Harvest Survey, 1997-98

Job Completion Report, Federal Aid in Wildlife Restoration Act Project Number: W-112-R-7, Wildlife Harvest and Hunter Opinion Surveys, Study 1, Job No. 1Report issued on: December 1, 199

Illinois Furbearer Trapping Survey, 1997-98

Job Completion Report, Federal Aid Project Number W-112-R-7, Study 101 Job Number 101.2, Wildlife Restoration FundReport issued on: April 1, 199

Concentrations of Selected Elements, Physical Condition, Reproductive Activity, and Demographic Patterns in Small Mammalas Inhabiting DePue Wildlife Management Area

Waste Management and Research Center Sponsored Research Program ; HWR99-14

Job completion report : Hunter harvest and human dimensions research program, State of Illinois, project number W-112-R-8, job no. 1: 1998-99 Carlyle Lake Waterfowl Hunter Survey

unpublishednot peer reviewedOpe

1998-1999 Illinois Hunter Harvest Report

Job Completion Report, Hunter Harvest and Human Dimensions Research Program, Federal Aid in Wildlife Restoration Project Number W-112-R-8, Job No.

Illinois Furbearer Trapping Survey, 1998-99

Job Completion Report, Federal Aid in Wildlife Restoration Act Project Number W-112-R-8, Study 101 Job Number 101:2Report issued on: April 7, 200

Illinois Fur Hunter Survey, 1998-99

Job Completion Report, Federal Aid in Wildlife Restoration Act Project Number: W-112-R-8, Illinois Forest Game Hunter Survey: Fur Hunters 1998-99, Study 101, Job Number 101:5Report issued on: April 7, 200