6 research outputs found
Boiling-induced formation of colloidal gold in black smoker hydrothermal fluids
Gold colloids occur in black smoker fluids from the Niua South
hydrothermal vent field, Lau Basin (South Pacific Ocean), confirming
the long-standing hypothesis that gold may undergo colloidal
transport in hydrothermal fluids. Six black smoker vents, varying
in temperature from 250 °C to 325 °C, were sampled; the 325 °C
vent was boiling at the time of sampling and the 250 °C fluids were
diffusely venting. Native gold particles ranging from <50 nm to 2
ÎĽm were identified in 4 of the fluid samples and were also observed
to precipitate on the sampler during collection from the boiling vent.
Total gold concentrations (dissolved and particulate) in the fluid samples
range from 1.6 to 5.4 nM in the high-temperature, focused flow
vents. Although the gold concentrations in the focused flow fluids are
relatively high, they are lower than potential solubilities prior to boiling
and indicate that precipitation was boiling induced, with sulfide
lost upon boiling to exsolution and metal sulfide formation. Gold
concentrations reach 26.7 nM in the 250 °C diffuse flow sample, and
abundant native gold particles were also found in the fluids and associated
sulfide chimney and are interpreted to be a product of colloid
accumulation and growth following initial precipitation upon boiling.
These results indicate that colloid-driven precipitation as a result of
boiling, the persistence of colloids after boiling, and the accumulation
of colloids in diffuse flow fluids are important mechanisms for the
enrichment of gold in seafloor hydrothermal systems
sj-pdf-1-saj-10.1177_08897077231195995 – Supplemental material for Evaluating a Video-Based Addiction Curriculum at a Safety Net Academic Medical Center
Supplemental material, sj-pdf-1-saj-10.1177_08897077231195995 for Evaluating a Video-Based Addiction Curriculum at a Safety Net Academic Medical Center by Alyssa F. Peterkin, Marielle Baldwin, Lindsay Demers and Katherine Gergen Barnett in Substance Abuse</p
Developing a Women’s Health track within addiction medicine fellowship: reflections and inspirations
Abstract Background Women who use drugs face sexism and intersectional stigma that influence their drug use experiences and treatment needs. There is a need to build the capacity of addiction medicine specialists who can deliver gender-responsive services and advance research and policy in women-focused addiction care. We describe the development of a Women’s Health track within an addiction medicine fellowship program and reflect on successes, challenges, and future directions. Main body The Women’s Health track was developed in collaboration between program leaders in Addiction Medicine and Obstetrics/Gynecology. Implementing the track led to the development of women-focused rotations and continuity clinics, as well as enrichment of women’s health didactic education for all fellows. The fellowship track spurred interdepartmental mentorship and collaboration on research and advocacy projects. Conclusion Addiction medicine fellowships can replicate this curriculum model to advance women-focused education, research, and policy. Future curricula should focus on structural sexism in drug use and addiction treatment throughout a woman’s life course