Incidence Rates and Risks for Reoperations for Nonunion and Adjacent Level Disease: Stopping at L1 versus T10/T11/12.

Study Design: A retrospective cohort study.

Objective: To determine if there is a difference in reoperations for adjacent segment disease (operative ASD) and nonunion (operative nonunion) in lumbar fusions that stop at T10/T11/T12 versus L1.

Summary Of Background Data: Current lumbar spine surgery is based on the belief that ASD occurs if fusions are stopped at L1 although there is varying evidence to support this assumption.

Obstetric Anal Sphincter Injury: Vaginal Birth After Cesarean Versus First Vaginal Delivery.

Importance: Modern data regarding the relationship between vaginal birth after cesarean (VBAC) and obstetric anal sphincter injury (OASI) are minimal with mixed results.

Objective: The aim of the study was to determine if VBAC is associated with an increased risk of OASIs.

Study Design: This was a retrospective cohort study of liveborn deliveries from 2018 to 2022 within a large, multihospital academic health system.

Hybrid Bilayer Interfaces within Reversed-Phase Chromatographic Silica Formed by Self-Assembly of Long-Chain Primary Alcohols.

Modification of silica interfaces by covalent attachment of functional ligands is a primary means of controlling the interfacial chemistry of porous silicas used in separations, environmental cleanup, and biosensing. Recently, modification of hydrophobic, -alkyl-silane-functionalized interfaces has been achieved through self-assembly of zwitterionic phospholipids or mixed-charged surfactants to form "hybrid bilayers", producing interfaces that mimic lipid-bilayer partitioning and provide shape-selective partitioning of aromatic hydrocarbons. Charged headgroups, however, introduce electrostatic interactions that strongly influence the retention of ionizable solutes and require careful control over pH and ionic strength in the solution phase.

Symptom appraisal and help-seeking before a cancer diagnosis during pregnancy: a qualitative study.

Background Estimated incidence of cancer diagnosis during or shortly after pregnancy is 1 in 1,000 women. Pregnancy can impact symptom appraisal and help-seeking for symptoms subsequently diagnosed as cancer. Little is known about the pathway to cancer diagnosis in pregnancy or delays that women can encounter.

Confocal Raman Microscopy for Measuring In Situ Temperature-Dependent Structural Changes in Poly(Ethylene Oxide) Thin Films.

Crystallization from the melt is a critical process governing the properties of semi-crystalline polymeric materials. While structural analyses of melting and crystallization transitions in bulk polymers have been widely reported, in contrast, those in thin polymer films on solid supports have been underexplored. Herein, in situ Raman microscopy and self-modeling curve resolution (SMCR) analysis are applied to investigate the temperature-dependent structural changes in poly(ethylene oxide) (PEO) films during melting and crystallization phase transitions.