Kinetic analysis of strand invasion during meiosis reveals similar rates of sister- and homolog-directed repair.

Meiotic chromosome segregation requires reciprocal exchanges between the parental chromosomes (homologs). Exchanges are formed via tightly-regulated repair of double-strand DNA breaks (DSBs). However, since repair intermediates are mostly quantified in fixed images, our understanding of the mechanisms that control the progression of repair remains limited.

Two-week Paramedic Hospital Training Augments Blood Pressure Response to Isometric Handgrip Exercise in Healthy Young Men.

Persistent stressful situations can have detrimental cardiovascular effects; however, effects on the blood pressure (BP) response to exercise have not been fully examined. This study investigated the impact of a 2-week stressful situation on the exercise pressor response. Eight healthy male university paramedic trainees underwent a 2-week paramedic hospital training and a control period study.

Synthesis of trans-Fused 3,6-Anhydro Hexofuranose Frameworks via Catalytic Hydrogenolysis Triggered Debenzylative Intramolecular Acetalation.

Presented herein is the chemical construction of unprecedented 3,4-trans-3,6-anhydro hexofuranose frameworks. The disfavored 3,6-anhydro hexofuranosides were effectively established by Pd-catalyzed debenzylative intramolecular acetalation for the first time. The critical roles of benzyl protection and Pd as catalyst were demonstrated.

The extinction burst: Effects of reinforcement magnitude.

The extinction burst is an increase in an operant behavior early in the transition to extinction. A matching-law-based quantitative theory suggests that it results from the elimination of competition from reinforcement-related behavior that accompanies the transition to extinction. This experiment examined the effects of reinforcement magnitude on the extinction burst with rats.

Proteasome inhibition enhances oncolytic reovirus therapy in multiple myeloma independently of its direct cytotoxic effects.

Background: Reovirus (RV) is an oncolytic virus with natural tropism for cancer cells. We previously showed that RV administration in multiple myeloma (MM) patients was safe, but disease control associated with viral replication in the cancer cells was not observed. The combination with proteasome inhibitors (PIs) has shown to enhance RV therapeutic activity, but the mechanisms of action have not been fully elucidated.

Proposed resources required for a comprehensive program for CCT CHD imaging.

Background: Cardiac Computed Tomography (CCT) is increasingly used for evaluation of congenital heart disease (CHD) in patients of all ages. Pediatric and adult congenital heart disease (ACHD) surgical programs require high quality CCT imaging as part of the multimodality imaging support expected of comprehensive care centers. Despite these expectations, there are no benchmarks or defined programmatic elements specific to the performance of CCT in patients with CHD.

Carcinogenic Air Pollutants and Breast Cancer Risk in the Arkansas Rural Community Health Study: A Nested Case-Control Study.

Background: Previous epidemiological studies on the associations between hazardous air pollutants (HAPs) and breast cancer (BC) have largely neglected rural, medically underserved areas in the United States, which differ in exposures and disparities compared to urban areas.

Objectives: We aimed to examine the associations between carcinogenic HAPs and BC risk in a rural population.

Methods: Using a nested case-control design, 574 cases and 2,295 incidence density-sampled controls matched 1:4 on index age and race were included from the Arkansas Rural Community Health study.

The ACTION VAD Registry: A Collective Five-Year Experience.

Background: The Advanced Cardiac Therapies Improving Outcomes Network (ACTION) began in 2018 as a collaborative learning health system committed to improving outcomes in pediatric heart failure, including children and adults with congenital heart disease, supported with ventricular assist devices (VADs). This report describes patient and device characteristics, and outcomes through 1-year post-implant.

Methods: The ACTION VAD registry report was created from data submitted to the ACTION learning network from April 2018-June 2023.

Artificial Urinary Sphincter Placement Before or After Radiation Therapy: Does Timing of Radiation Impact Surgical Complications and Continence?

Objectives: To evaluate the impact of radiation timing on artificial urinary sphincter (AUS) outcomes. AUS is the gold standard treatment for post-prostatectomy incontinence. Radiation history has been associated with worse outcomes, including higher rates of erosion and infection.

Radiotherapy toxicities: mechanisms, management, and future directions.

For over a century, radiotherapy has revolutionised cancer treatment. Technological advancements aim to deliver high doses to tumours with increased precision while minimising off-target effects to organs at risk. Despite advancements such as image-guided, high-precision radiotherapy delivery, long-term toxic effects on healthy tissues remain a great clinical challenge.

Mammalian nucleophagy: process and function.

The nucleus is a highly specialized organelle that houses the cell's genetic material and regulates key cellular activities, including growth, metabolism, protein synthesis, and cell division. Its structure and function are tightly regulated by multiple mechanisms to ensure cellular integrity and genomic stability. Increasing evidence suggests that nucleophagy, a selective form of autophagy that targets nuclear components, plays a critical role in preserving nuclear integrity by clearing dysfunctional nuclear materials such as nuclear proteins (lamins, SIRT1, and histones), DNA-protein crosslinks, micronuclei, and chromatin fragments.

Economic inequality, intergenerational mobility, and life expectancy.

This study explores the mediating role of intergenerational mobility (IM) in the relationship between economic inequality and population health in the United States, focusing on life expectancy. Using multilevel structural equation modeling across state and commuting zone (CZ) levels for both genders, we find that economic inequality indices, except for the top 1 percent's income share, adversely affect life expectancy through absolute and relative mobility. Specifically, economic inequality reduces life expectancy more significantly through absolute mobility, especially among males and lower-income groups, with nuanced impacts observed across different geographic levels.

Comparison of Postoperative Antibiotic Protocols for Pediatric Complicated Appendicitis: A Western Pediatric Surgery Research Consortium Study.

Background: There is no consensus on the appropriate duration of postoperative antibiotics for complicated appendicitis in children. Commonly used antibiotic endpoints include normalization of white blood cell count (WBC) or completion of a minimum number of prespecified treatment days. We compared clinical outcomes resulting from varying postoperative antibiotic protocols for complicated appendicitis in children.

Heterozygous Eif4nif1 Stop Gain Mice Replicate the Primary Ovarian Insufficiency Phenotype in Women.

We created the c.1286C>G stop-gain mutation found in a family with primary ovarian insufficiency (POI) at age 30 years. The Eif4enif1 C57/Bl6 transgenic mouse model contained a floxed exon 10-19 cassette with a conditional knock-in cassette containing the c.

A multifactorial, evidence-based analysis of pathophysiology in Spaceflight Associated Neuro-Ocular Syndrome (SANS).

The National Aeronautics and Space Administration (NASA) in the United States has been studying a fascinating and unique constellation of neuro-ophthalmic findings collectively known as Spaceflight Associated Neuro-Ocular Syndrome (SANS). SANS is unique to the space environment of microgravity and produces novel physiological and pathological findings that have no direct terrestrial equivalent. The neuro-ophthalmic phenomenon is a major physiologic barrier to future planetary spaceflight.

In-vitro assay studies and molecular docking of functionalized chitosan decorated vanadium pentoxide nano-agents as an antidiabetic drug.

This study aims to enhance the antidiabetic potential of Vanadium pentoxide (VO) by synthesizing chitosan-based nanoparticles (NPs). Chitosan and its derivatives were used to fabricate VO NPs, ensuring enhanced antioxidant and antidiabetic activity. Surface topography was analyzed using atomic force microscopy (AFM), revealing bioactive sites on the NPs with improved electron-transfer capability, as confirmed by cyclic voltammetry (CV).

Symptom Documentation in Unstructured Palliative Care Notes of Children and Adolescents with Cancer.

Context: Children and adolescents with cancer experiencing complex symptoms can benefit from subspeciality palliative care. However, standardized methods of symptom documentation by pediatric palliative care teams are lacking. Understanding current approaches to symptom documentation will inform next steps to optimize symptom support.

A study of internal structure validity for the American board of surgery in training examination.

Background: As principles of competency-based medical education are implemented into graduate medical education [GME] programs, it is imperative that the assessments employed are reliable and valid. Internal structure is a core component of validity evidence that has been under studied. In this study, we examined elements of the internal structure for the American Board of Surgery In-Training Examination [ABSITE].

Predicting fall parameters from infant skull fractures using machine learning.

When infants are admitted to the hospital with skull fractures, providers must distinguish between cases of accidental and abusive head trauma. Limited information about the incident is available in such cases, and witness statements are not always reliable. In this study, we introduce a novel, data-driven approach to predict fall parameters that lead to skull fractures in infants in order to aid in determinations of abusive head trauma.

Time Dilation in Motivational Congruence Theory's Paradigm.

Time dilation is an important issue in the field of physics. Introduced by the special relativity theory, it means that the time duration spent by an entity to reach a certain destination depends on the movement and speed of the entity. Time dilation has been widely addressed in other disciplines, including philosophy, psychology, and motivation.