Report on a special investigation of Oran Township in Fayette County for the period January 1, 2003 through September 22, 2009

Report on a special investigation of Oran Township in Fayette County for the period January 1, 2003 through September 22, 2009

Report on a special investigation of the Rodman Volunteer Fire Department and Park and Recreation Department for the period January 1, 2006 through September 30, 2009

Report on a special investigation of the Rodman Volunteer Fire Department and Park and Recreation Department for the period January 1, 2006 through September 30, 2009

Report on a special investigation of the City of New Albin for the period January 1, 2006 through July 31, 2009

Report on a special investigation of the City of New Albin for the period January 1, 2006 through July 31, 2009

Report on a special investigation of the Cedar Rapids Community School District for the period July 1, 2002 through August 24, 2009

Report on a special investigation of the Cedar Rapids Community School District for the period July 1, 2002 through August 24, 2009

Properties of slow-release phosphorus fertilizers with special references to their use on drained peatland forests : A review

Tiivistelmä: Hidasliukoisten fosforilannoitteiden ominaisuudet ja käyttökelpoisuus suometsien lannoituksessa. Kirjallisuuteen perustuva tarkastelu

Report on a special investigation of certain collections of the Tama County Clerk of Court and the Tama County Sheriff’s Office for the period January 1, 2007 through August 31, 2009

Report on a special investigation of certain collections of the Tama County Clerk of Court and the Tama County Sheriff’s Office for the period January 1, 2007 through August 31, 2009

Report on a special investigation of Squaw Township for the period April 19, 2001 through March 18, 2009

Report on a special investigation of Squaw Township for the period April 19, 2001 through March 18, 2009

Impact of Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry on the Clinical Management of Patients With Gram-negative Bacteremia: A Prospective Observational Study.

Background. Early identification of pathogens from blood cultures using matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry may optimize the choice of empirical antibiotic therapy in the setting of bloodstream infections. We aimed to assess the impact of this new technology on the use of antibiotic treatment in patients with gram-negative bacteremia. Methods. We conducted a prospective observational study from January to December 2010 to evaluate the sequential and separate impacts of Gram stain reporting and MALDI-TOF bacterial identification performed on blood culture pellets in patients with gram-negative bacteremia. The primary outcome was the impact of MALDI-TOF on empirical antibiotic choice. Results. Among 202 episodes of gram-negative bacteremia, Gram stain reporting had an impact in 42 cases (20.8%). MALDI-TOF identification led to a modification of empirical therapy in 71 of all 202 cases (35.1%), and in 16 of 27 cases (59.3%) of monomicrobial bacteremia caused by AmpC-producing Enterobacteriaceae. The most frequently observed impact was an early appropriate broadening of the antibiotic spectrum in 31 of 71 cases (43.7%). In total, 143 of 165 episodes (86.7%) of monomicrobial bacteremia were correctly identified at genus level by MALDI-TOF. Conclusions. In a low prevalence area for extended spectrum betalactamases (ESBL) and multiresistant gram-negative bacteria, MALDI-TOF performed on blood culture pellets had an impact on the clinical management of 35.1% of all gram-negative bacteremia cases, demonstrating a greater impact than Gram stain reporting. Thus, MALDI-TOF could become a vital second step beside Gram stain in guiding the empirical treatment of patients with bloodstream infection.

Special investigation of the City of Collins Library for the period July 1, 2007 through July 30, 2009

Special investigation of the City of Collins Library for the period July 1, 2007 through July 30, 2009

Special investigation of the Newell Ambulance Service for the period August 1, 2004 through September 30, 2009

Special investigation of the Newell Ambulance Service for the period August 1, 2004 through September 30, 2009

Report on a special investigation of the Food Service Department of the Springville Community School District for the period July 1, 2005 through March 31, 2009

Report on a special investigation of the Food Service Department of the Springville Community School District for the period July 1, 2005 through March 31, 2009

Report on a special investigation of the Muscatine County Drug Task Force for the period January 1, 2004 through November 30, 2009

Report on a special investigation of the Muscatine County Drug Task Force for the period January 1, 2004 through November 30, 2009

A filtering method to correct time-lapse 3D ERT data and improve imaging of natural aquifer dynamics

We have developed a processing methodology that allows crosshole ERT (electrical resistivity tomography) monitoring data to be used to derive temporal fluctuations of groundwater electrical resistivity and thereby characterize the dynamics of groundwater in a gravel aquifer as it is infiltrated by river water. Temporal variations of the raw ERT apparent-resistivity data were mainly sensitive to the resistivity (salinity), temperature and height of the groundwater, with the relative contributions of these effects depending on the time and the electrode configuration. To resolve the changes in groundwater resistivity, we first expressed fluctuations of temperature-detrended apparent-resistivity data as linear superpositions of (i) time series of riverwater-resistivity variations convolved with suitable filter functions and (ii) linear and quadratic representations of river-water-height variations multiplied by appropriate sensitivity factors; river-water height was determined to be a reliable proxy for groundwater height. Individual filter functions and sensitivity factors were obtained for each electrode configuration via deconvolution using a one month calibration period and then the predicted contributions related to changes in water height were removed prior to inversion of the temperature-detrended apparent-resistivity data. Applications of the filter functions and sensitivity factors accurately predicted the apparent-resistivity variations (the correlation coefficient was 0.98). Furthermore, the filtered ERT monitoring data and resultant time-lapse resistivity models correlated closely with independently measured groundwater electrical resistivity monitoring data and only weakly with the groundwater-height fluctuations. The inversion results based on the filtered ERT data also showed significantly less inversion artefacts than the raw data inversions. We observed resistivity increases of up to 10% and the arrival time peaks in the time-lapse resistivity models matched those in the groundwater resistivity monitoring data.

Simply IPERS: Special Edition, Summer 2010

Newsletter by IPERS about what is happening in this department. The changes that have taken place in the guideline and policies.