The Daily Trickle

FDA exempts certain clinical toxicology test systems from premarket notification

The Food and Drug Administration (FDA) has issued a final determination exempting certain class II clinical toxicology test systems from premarket notification (510(k)) requirements, subject to limits. The exemption took effect on October 6, 2026 and is in effect immediately, and the Code of Federal Regulations is amended to match. The FDA says the exemption will decrease regulatory burdens on the medical device industry.

Published

Oct 6, 2026

Effective

Oct 6, 2026

How to weigh in: No comment period: this is a final rule.

Preprint describes a lightweight retinal foundation model for eye photographs

This preprint on medRxiv, not yet reviewed by other scientists, describes RFM, a 64-million-parameter vision transformer trained on 4.3 million colour fundus photographs. It reports that a single frozen backbone predicts diabetic retinopathy grading, glaucoma, UK Biobank biomarkers and three-year incidence of myocardial infarction, ischaemic stroke and Parkinson's disease.

Published

Oct 7, 2026

Modelling study finds targeting long-acting HIV prevention averts more infections

This modelling preprint on medRxiv, not yet reviewed by other scientists, estimates the impact and cost of targeted long-acting HIV pre-exposure prophylaxis (LAP) across sub-Saharan Africa to 2050. Across 34 countries, allocating a fixed quantity of LAP by district, sex and age averted 2 to 21 times as many infections as uniform allocation, and LAP offsets its cost through averted treatment only when it is targeted.

Published

Oct 7, 2026

Preprint models effect of dropping race-adjusted hypertension treatment advice

This microsimulation preprint on medRxiv, not yet reviewed by other scientists, models removing race-adjusted antihypertensive treatment recommendations for non-Hispanic Black adults. If treatment effectiveness differs by race, life expectancy among non-Hispanic Black adults falls by 0.4 years in the model and the gap with non-Hispanic white adults widens; if it does not, the effect is smaller, at 0.1 years.

Published

Oct 7, 2026

Preprint tests machine learning on health records to predict sleep apnea

This preprint on medRxiv, not yet reviewed by other scientists, reports machine learning models that use only routinely collected electronic health record data to predict obstructive sleep apnea (OSA). In internal testing the full XGBoost model reached a ROC-AUC of 0.791 for any OSA, and external validation at a second health system gave a ROC-AUC of 0.718 for the full model.

Published

Oct 7, 2026

Preprint finds Nigerian women's contraceptive use tracks cumulative disadvantage

This preprint on medRxiv, not yet reviewed by other scientists, analyzes 2018 and 2024 Nigeria Demographic and Health Surveys covering 80,871 women aged 15 to 49. It finds modern contraceptive use is far lower among women in the most disadvantaged profile, and that use rose across all profiles between 2018 and 2024 while inequalities persisted.

Published

Oct 7, 2026

Preprint maps biological pathways behind weight gain from mental health drugs

This preprint on medRxiv, not yet reviewed by other scientists, uses network pharmacology to link 33 antidepressants and 26 antipsychotics to pathways associated with weight-related side effects. It highlights GPCR, PI3K-Akt, leptin and insulin signaling, and adipogenesis as candidate pathways, based on computational analysis of drug-protein interactions.

Published

Oct 8, 2026

Preprint uses plasma proteins to measure environmental exposures across groups

This preprint on medRxiv, not yet reviewed by other scientists, uses plasma proteomic profiles of 10,043 participants in the All of Us Research Program to build protein scores for more than 100 exposures. It finds the protein signatures largely consistent across populations, and that PM2.5 protein scores track exposure variation within regions.

Published

Oct 8, 2026

Preprint links phthalate and flame retardant exposure to liver disease risk

This population-based preprint on medRxiv, not yet reviewed by other scientists, analyzes 39,061 U.S. adults in the National Health and Nutrition Examination Survey (NHANES) from 1999 to 2020. It links phthalate esters and organophosphate flame retardants to higher odds of steatotic liver disease, and suggests inflammation markers account for part of the association; as an observational analysis, it shows a link, not a cause.

Published

Oct 8, 2026

CDC report finds rising mental distress and inactivity among young adults

This final report from CDC MMWR describes increases in frequent mental distress and physical inactivity among adults aged 18 to 29 years in the United States during 2012 to 2024.

Published

Oct 8, 2026

Treasury withdraws proposed rule on convertible virtual currency mixing

On October 6, 2026, the Financial Crimes Enforcement Network (FinCEN) of the Treasury Department withdrew its finding and proposed rulemaking that international convertible virtual currency mixing is a class of transactions of primary money laundering concern under section 311 of the USA PATRIOT Act. The proposed special measure is withdrawn and is no longer pending.

Published

Oct 6, 2026

Treasury drops proposed reporting rule for transactions in unhosted wallets

On October 6, 2026, the Financial Crimes Enforcement Network (FinCEN) withdrew its proposed rule that would have required banks and money service businesses (MSBs) to file reports, keep records and verify customers' identities for transactions in convertible virtual currency or digital assets held in unhosted wallets or in certain jurisdictions. FinCEN says it will take no further action on the proposal.

Published

Oct 6, 2026

Preprint: tax-planning structures held 36% of US multinationals' foreign profits

This preprint from NBER, not yet peer-reviewed, uses newly linked IRS data to study tax-planning structures that exploit mismatches between US and foreign tax laws. It reports that in 2016 these structures accounted for 36% of foreign profits despite being adopted by 18% of firms, and it uses a structural model to show trade-offs between tax revenue and economic activity from restricting them.

Published

Oct 8, 2026

Preprint finds Japan's rural areas depopulating and aging faster than urban ones

This preprint from NBER, not yet peer-reviewed, uses spatially disaggregated data from Japan to show that rural areas have experienced faster depopulation and aging than urban areas, driven by low fertility and out-migration of young cohorts. A calibrated spatial model predicts widening geographic disparities, and subsidies to declining regions lower regional inequality at the cost of lower aggregate efficiency.

Published

Oct 8, 2026

Preprint finds language models in pricing markets differ widely in collusion

This preprint on arXiv, not yet reviewed by other scientists, simulates a four-firm logit Bertrand market in which each firm runs a different language model, without communication. It reports that collusion is a property of the model: Claude and Gemini markets reached 72 to 79 percent of the monopoly rent, DeepSeek 24 percent, and GPT markets none.

Published

Oct 9, 2026

Federal Aviation Administration proposes simpler space launch licensing

The Federal Aviation Administration proposes to amend its commercial space launch and reentry licensing rules to streamline licensing and reduce the regulatory burden on operators. Under the proposal, operators using physical containment as a hazard control would not need to develop flight hazard areas under the existing analysis requirements. The change is a proposal only and would not take effect unless adopted.

Published

Oct 5, 2026

Comments close

Nov 4, 2026

How to weigh in: Comment by November 4, 2026.

Puerto Rico rainbow runner reclassified from reef fish to pelagic fish

The National Oceanic and Atmospheric Administration has issued a rule implementing Amendment 4 to the Puerto Rico Fishery Management Plan, which reclassifies rainbow runner from a reef fish to a pelagic fish. The rule sets management measures for the species on that basis, including sector annual catch targets and accountability measures, and keeps the existing sector annual catch limits. It is in effect from October 5, 2026.

Published

Oct 5, 2026

Effective

Oct 5, 2026

How to weigh in: No comment period: this is a final rule.

North Carolina transfers part of its 2026 summer flounder quota to Massachusetts

The National Oceanic and Atmospheric Administration announces that North Carolina is transferring part of its 2026 commercial summer flounder quota to Massachusetts. The temporary rule revises the 2026 commercial quotas for both states under the Summer Flounder, Scup, and Black Sea Bass Fishery Management Plan. It has been in effect since October 2, 2026.

Published

Oct 5, 2026

Effective

Oct 2, 2026

How to weigh in: No comment period: this is a final rule.

Atlantic bluefin tuna quota shifted to General category for October and November

The National Oceanic and Atmospheric Administration is moving 70.2 metric tons of quota from the Reserve category into the General category's October through November subquota, and adding 16.7 metric tons left over from June through August. The adjusted subquota is 192.9 metric tons and the Reserve category falls to 42 metric tons. The rule affects commercial General category vessels and Highly Migratory Species (HMS) Charter/Headboat vessels with a commercial sale endorsement, and it took effect on October 6, 2026.

Published

Oct 8, 2026

Effective

Oct 6, 2026

How to weigh in: No comment period: this is a final rule.

Lab study links chronic cigarette smoke exposure to two lung cancer subtypes

This peer-reviewed study in PNAS uses normal lung organoids to show that chronic exposure to cigarette smoke condensate pushes two types of stem cells toward premalignant states. When specific mutations are added, one stem cell type gives rise to adenocarcinomas and the other to squamous cell carcinomas, two major types of non-small cell lung cancer. The findings come from laboratory models.

Published

Oct 5, 2026

Preprint proposes benchmarks for commercial hybrid water electrolysis

This preprint on ChemRxiv, not yet reviewed by other scientists, proposes three performance metrics for hybrid water electrolysis, a process that produces hydrogen while oxidizing an organic chemical, and benchmarks reported systems against them. A techno-economic analysis links these metrics to net present value and identifies catalyst stability as the foremost bottleneck.

Published

Oct 5, 2026

Preprint finds uniform pores make solid-state battery separators more reliable

This preprint on ChemRxiv, not yet reviewed by other scientists, studies sulfide solid-electrolyte separators for all-solid-state batteries. It reports that a more homogeneous pore network gives more mechanically reliable separators, while a separator with a broad particle-size distribution showed cracking and interfacial delamination after cycling.

Published

Oct 5, 2026

Mouse study points to Ldhb gene in diabetes-linked cognitive decline

This peer-reviewed PNAS study in mouse models maps gene activity across brain regions in type 2 diabetes-associated cognitive dysfunction and identifies lactate dehydrogenase B (Ldhb) as a shared effector. In these mice, raising Ldhb alleviated mitochondrial dysfunction, oxidative stress, neuronal apoptosis and cognitive impairment, and the study highlights it as a potential therapeutic target.

Published

Oct 6, 2026

Preprint simulates how CO2 binds in alkanolamine solvents used for capture

This preprint on ChemRxiv, not yet reviewed by other scientists, combines density functional theory, molecular dynamics and microkinetic modeling to study CO2 chemisorption in choline-imidazolate solvents with monoethanolamine, diethanolamine or methyldiethanolamine. It finds that choline is the preferred binding site unless an alkanolamine is present, which shifts capture toward carbamate formation.

Published

Oct 6, 2026

Lung organoid study finds SARS-CoV-2 infection builds protective T cell memory

This peer-reviewed study in Nature uses human lung organoids that contain their own resident immune cells. It shows that SARS-CoV-2 infection elicits protective tissue-resident memory T cell responses, which the study describes as local recall immunity in the lung.

Published

Oct 7, 2026

Mouse study links antidepressant tianeptine to opioid receptors in the brain

This peer-reviewed PNAS study in mice finds that the antidepressant tianeptine enhances excitatory transmission at α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in the hippocampus. The enhancement is indirectly mediated by activation of opioid receptors, and opioid peptides and selective agonists mimic it.

Published

Oct 7, 2026

Preprint reports platinum nanocluster catalysts for hydrogen from methylcyclohexane

This preprint on ChemRxiv, not yet reviewed by other scientists, reports atomically precise platinum nanocluster catalysts on Al2O3 for dehydrogenating methylcyclohexane to produce hydrogen. It reports mass activity up to 8.2 times that of conventional nanoparticle catalysts, with byproduct yield below 3% at 250 °C.

Published

Oct 7, 2026

Preprint describes room-temperature tin oxide nanocrystals for solar cells

This preprint on ChemRxiv, not yet reviewed by other scientists, describes a self-quenched synthesis of tin oxide nanocrystals at room temperature that the preprint reports is independent of most synthesis conditions. Perovskite solar cells built with the nanocrystal thin films reached power conversion efficiencies of at least 21%.

Published

Oct 7, 2026

Preprint reports a more stable iron-based electrode for oxygen evolution

This preprint on ChemRxiv, not yet reviewed by other scientists, reports that alloying FeOOH with Se, Sn, Ti or Hf slows its dissolution in alkaline electrolyte. FeTiOOH dissolved about eight times more slowly than FeOOH, but the more stable alloys also showed reduced oxygen evolution reaction activity.

Published

Oct 7, 2026

Preprint finds pore uniformity sets reliability of battery separators

A second version of this ChemRxiv preprint, not yet reviewed by other scientists, reports that pore-network homogeneity governs the mechanical reliability of sulfide solid-electrolyte separators. Separators with a narrower particle-size distribution showed a more homogeneous pore network and local mechanical response, while the heterogeneous separator cracked and delaminated after cycling.

Published

Oct 8, 2026

Preprint simulates lithium sulfide growth at solid-state battery interfaces

This preprint on ChemRxiv, not yet reviewed by other scientists, simulates the Li/Li 6 PS 5 Cl interface with machine-learning interatomic potentials. Without a field the electrolyte decomposes into a Li 2 S-rich interphase, and an electric field speeds this growth nearly seven-fold, after which a percolating Li 2 S network persists even when the current is reversed.

Published

Oct 8, 2026

Mouse study ties early blood-brain barrier loss to Alzheimer's disease

This preprint on bioRxiv, not yet reviewed by other scientists, reports that loss of the endothelial protein MFSD2A is an early, hippocampus-specific feature of blood-brain barrier disruption in Alzheimer's disease. In APP/PS1 mice, sustained restoration of MFSD2A from an early stage gave the greatest protection, reducing leakage, amyloid plaques and memory deficits, while restoring it later did not reverse leakage or cognitive impairment.

Published

Oct 8, 2026

Preprint links DNA polymerase kappa to neuronal genome repair and resilience

This preprint on bioRxiv, not yet reviewed by other scientists, studies DNA polymerase kappa (POLK) in mouse cortical neurons and in human induced pluripotent stem cell-derived forebrain neurons. Partial POLK depletion produced a senescence-like stress phenotype and reduced EdU incorporation, while augmenting POLK in neurons increased EdU incorporation and reduced DNA damage markers.

Published

Oct 8, 2026

Preprint maps synapse protein changes across Alzheimer's disease stages

This preprint on bioRxiv, not yet reviewed by other scientists, profiles synaptic proteins from post-mortem brain tissue of 67 people, 40 with Alzheimer's disease across all Braak stages and 27 non-diseased controls. It identifies six stage-associated signatures and nominates 42 plasma proteins linked to disease stage and cognitive measures.

Published

Oct 8, 2026

Preprint finds 34 gene deletions associated with cancer incidence

This preprint on bioRxiv, not yet reviewed by other scientists, applies a gene-centric analysis to copy number variants that delete whole genes. It identifies 34 gene deletions associated with cancer incidence, including deletions in the 13q14 region linked to higher cancer risk, and reports associations with asthma and heart attack.

Published

Oct 8, 2026

Mouse study finds bone hormone osteocalcin supports motoneuron mitochondria

This preprint on bioRxiv, not yet reviewed by other scientists, reports in mice that the bone-derived hormone osteocalcin signals through the GPR158 receptor on spinal motoneurons to fine-tune autophagy, mitophagy and mitochondrial activity. Restoring these processes rescued locomotor deficits in GPR158-deficient mice, and restoring osteocalcin in aged mice reversed age-related locomotor decline.

Published

Oct 8, 2026

Preprint finds shared inflammation signals in aging muscle and Alzheimer's brain

This preprint on bioRxiv, not yet reviewed by other scientists, compares transcriptomic data from skeletal muscle and brain tissue to test a putative muscle-brain axis in Alzheimer's disease. It reports convergent endothelial and myeloid inflammatory programs, with related signals detectable in blood, and nominates ETS2 and BHLHE40 as candidate regulators for testing.

Published

Oct 8, 2026

Preprint tests user-mood groups in a Netflix recommendation experiment

This preprint on arXiv, not yet reviewed by other scientists, infers latent user moods from pre-treatment actions with a hidden Markov model, then estimates treatment effects by those states. In a large-scale A/B test of a new recommendation model at Netflix, heavy-engagement users showed significantly positive effects, with limited evidence of benefit among less-active and rewatch-oriented users.

Published

Oct 9, 2026

Preprint finds outbreak transmission trees improve epidemic parameter estimates

This preprint on arXiv, not yet reviewed by other scientists, tests whether summary statistics from transmission trees improve neural simulation-based inference of the reproduction number and infection duration in simulated susceptible-infectious-recovered (SIR) outbreaks. It reports that adding tree statistics improved both estimates over case counts alone, and that all three neural models outperformed the baseline.

Published

Oct 9, 2026