Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 3 de 3
Filter
Add more filters










Publication year range
1.
Environ Pollut ; 290: 118012, 2021 Dec 01.
Article in English | MEDLINE | ID: mdl-34482248

ABSTRACT

Metal release into the environment from anthropogenic activities may endanger ecosystems and human health. However, identifying and quantifying anthropogenic metal bioaccumulation in organisms remain a challenging task. In this work, we assess Cu isotopes in Pacific oysters (C. gigas) as a new tool for monitoring anthropogenic Cu bioaccumulation into marine environments. Arcachon Bay was taken as a natural laboratory due to its increasing contamination by Cu, and its relevance as a prominent shellfish production area. Here, we transplanted 18-month old oysters reared in an oceanic neighbor area into two Arcachon Bay mariculture sites under different exposure levels to continental Cu inputs. At the end of their 12-month long transplantation period, the oysters' Cu body burdens had increased, and was shifted toward more positive δ65Cu values. The gradient of Cu isotope compositions observed for oysters sampling stations was consistent with relative geographic distance and exposure intensities to unknown continental Cu sources. A binary isotope mixing model based on experimental data allowed to estimate the Cu continental fraction bioaccumulated in the transplanted oysters. The positive δ65Cu values and high bioaccumulated levels of Cu in transplanted oysters support that continental emissions are dominantly anthropogenic. However, identifying specific pollutant coastal source remained unelucidated mostly due to their broader and overlapping isotope signatures and potential post-depositional Cu isotope fractionation processes. Further investigations on isotope fractionation of Cu-based compounds in an aqueous medium may improve Cu source discrimination. Thus, using Cu as an example, this work combines for the first time a well-known caged bivalve approach with metal stable isotope techniques for monitoring and quantifying the bioaccumulation of anthropogenic metal into marine environments. Also, it states the main challenges to pinpoint specific coastal anthropogenic sources utilizing this approach and provides the perspectives for further studies to overcome them.


Subject(s)
Ostreidae , Water Pollutants, Chemical , Animals , Bioaccumulation , Copper/analysis , Ecosystem , Environmental Monitoring , Humans , Infant , Isotopes , Water Pollutants, Chemical/analysis
2.
J Surg Case Rep ; 2020(5): rjaa094, 2020 May.
Article in English | MEDLINE | ID: mdl-32477487

ABSTRACT

Foreign body ingestion is a common condition in clinical practice, thankfully most of the cases do not require any surgery as most foreign bodies can pass through the bowel without injuring it. Treatment depends on the size and kind of foreign bodies. When complications arise, patients may require urgent medical attention. Self-harm by sharp foreign body ingestion is a rare event that must always be promptly treated and should always be prevented. Psychiatric patients and inmates are the most affected population. A high index of suspicion is required to treat this rare condition, which may be preventable if there is adequate mental and medical therapy along with close monitoring and family support. We present the case of a 31-year-old psychiatric patient. After prompt treatment, two razor blades were surgically removed from her intestines. She fully recovered and is doing well on follow-up controls.

SELECTION OF CITATIONS
SEARCH DETAIL
...