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

Implementing trauma-focused cognitive behavioral therapy in Philadelphia: A 10-year evaluation

Background: In 2012, Philadelphia's Department of Behavioral Health and Intellectual disAbility Services (DBHIDS) developed an initiative to implement an evidence-based treatment for posttraumatic stress disorder (PTSD), trauma-focused cognitive behavioral therapy (TF-CBT), across the city's behavioral health system. This report evaluates the initiative's 10-year implementation and effectiveness outcomes. Method: The Exploration, Preparation, Implementation, and Sustainment framework guided our implementation evaluation. The implementation outcomes include adoption, reach, and sustainment; these were obtained during regular evaluation data collection from publicly funded behavioral health agencies participating in the TF-CBT initiative. We analyze effectiveness outcomes (i.e., changes in PTSD symptoms) from a subset of patients receiving TF-CBT, which were collected in 6-month intervals by our research team between 2013 and 2021. Results: From 2012 to 2021, DBHIDS trained 478 clinicians in TF-CBT across 20 behavioral health agencies. During this time, 23,401 youths were screened for potentially traumatic events and PTSD symptoms, and 7,550 youths received TF-CBT. Through the TF-CBT initiative, the city expanded the network of TF-CBT providers from 3 to 20 agencies. DBHIDS sustained this network by maintaining the participation of 16 behavioral health agencies over the course of a decade. The subset of 202 youths who were evaluated to assess TF-CBT effectiveness was drawn from 94 therapists and 20 agencies across Philadelphia. All participating youths completed a baseline assessment, and 151 (75%) completed at least one follow-up assessment. Linear mixed-effects models accounting for observations nested within participants and nested within clinicians found that treatment significantly reduced PTSD symptoms. Conclusion: Between 2012 and 2021, DBHIDS successfully implemented and sustained TF-CBT across the city's behavioral health system. Adoption, reach, and sustainment of TF-CBT were high. Despite the considerable adverse experiences faced by youths seeking treatment in Philadelphia's behavioral health system, TF-CBT was effective. Future directions to improve TF-CBT implementation in the next iteration of the initiative are described

sj-pdf-1-irp-10.1177_26334895231199467 - Supplemental material for Implementing trauma-focused cognitive behavioral therapy in Philadelphia: A 10-year evaluation

Supplemental material, sj-pdf-1-irp-10.1177_26334895231199467 for Implementing trauma-focused cognitive behavioral therapy in Philadelphia: A 10-year evaluation by Briana S. Last, Christina Johnson, Natalie Dallard, Sara Fernandez-Marcote, Arturo Zinny, Kamilah Jackson, Lauren Cliggitt, Brittany N. Rudd, Chynna Mills and Rinad S. Beidas in Implementation Research and Practice</p