Microplastic abundance, distribution and composition along a latitudinal gradient in the Atlantic Ocean

publisher: Elsevier articletitle: Microplastic abundance, distribution and composition along a latitudinal gradient in the Atlantic Ocean journaltitle: Marine Pollution Bulletin articlelink: http://dx.doi.org/10.1016/j.marpolbul.2016.12.025 content_type: article copyright: © 2016 Elsevier Ltd. All rights reserved

Microplastics in sea ice and seawater beneath ice floes from the Arctic Ocean

Within the past decade, an alarm was raised about microplastics in the remote and seemingly pristine Arctic Ocean. To gain further insight about the issue, microplastic abundance, distribution and composition in sea ice cores (n = 25) and waters underlying ice floes (n = 22) were assessed in the Arctic Central Basin (ACB). Potential microplastics were visually isolated and subsequently analysed using Fourier Transform Infrared (FT-IR) Spectroscopy. Microplastic abundance in surface waters underlying ice floes (0–18 particles m−3) were orders of magnitude lower than microplastic concentrations in sea ice cores (2–17 particles L−1). No consistent pattern was apparent in the vertical distribution of microplastics within sea ice cores. Backward drift trajectories estimated that cores possibly originated from the Siberian shelves, western Arctic and central Arctic. Knowledge about microplastics in environmental compartments of the Arctic Ocean is important in assessing the potential threats posed by microplastics to polar organisms

Microplastics in sub-surface waters of the Arctic Central Basin

© 2018 Elsevier Ltd Polar oceans, though remote in location, are not immune to the accumulation of plastic debris. The present study, investigated for the first time, the abundance, distribution and composition of microplastics in sub-surface waters of the Arctic Central Basin. Microplastic sampling was carried out using the bow water system of icebreaker Oden (single depth: 8.5 m) and CTD rosette sampler (multiple depths: 8–4369 m). Potential microplastics were isolated and analysed using Fourier Transform Infrared Spectroscopy (FT-IR). Bow water sampling revealed that the median microplastic abundance in near surface waters of the Polar Mixed Layer (PML) was 0.7 particles m −3 . Regarding the vertical distribution of microplastics in the ACB, microplastic abundance (particles m −3 ) in the different water masses was as follows: Polar Mixed Layer (0–375) > Deep and bottom waters (0–104) > Atlantic water (0–95) > Halocline i.e. Atlantic or Pacific (0–83)

Deep sea sediments of the Arctic Central Basin: A potential sink for microplastics

© 2019 Elsevier Ltd Deep sea sediments have emerged as a potential sink for microplastics in the marine environment. The discovery of microplastics in various environmental compartments of the Arctic Central Basin (ACB) suggested that these contaminants were potentially being transported to the deep-sea realm of this oceanic basin. For the first time, the present study conducted a preliminary assessment to determine whether microplastics were present in surficial sediments from the ACB. Gravity and piston corers were used to retrieve sediments from depths of 855–4353 m at 11 sites in the ACB during the Arctic Ocean 2016 (AO16) expedition. Surficial sediments from the various cores were subjected to density flotation with sodium tungstate dihydrate solution (Na 2 WO 4 ·2H 2 O, density 1.4 g cm −3 ). Potential microplastics were isolated and analysed by Fourier Transform Infrared (FT-IR) spectroscopy. Of the surficial samples, 7 of the 11 samples contained synthetic polymers which included polyester (n = 3), polystyrene (n = 2), polyacrylonitrile (n = 1), polypropylene (n = 1), polyvinyl chloride (n = 1) and polyamide (n = 1). Fibres (n = 5) and fragments (n = 4) were recorded in the samples. In order to avoid mis-interpretation, these findings must be taken in the context that (i) sampling equipment did not guarantee retrieval of undisturbed surficial sediments, (ii) low sample volumes were analysed (~10 g per site), (iii) replicate sediment samples per site was not possible, (iv) no air contamination checks were included during sampling and, (v) particles <100 µm were automatically excluded from analysis. While the present study provides preliminary indication that microplastics may be accumulating in the deep-sea realm of the ACB, further work is necessary to assess microplastic abundance, distribution and composition in surficial sediments of the ACB

Surgical Therapy: mastoplasty.

This book is especially focused on the surgical aspect on Gender Dysphoria. Male to female surgery is widely discussed as well as the female to male conversion. Full information on hormone administration and surgical procedures are provided. Mental health issues are also described, as well as ethics, the law and psychosocial issues. The text is extensively referenced and includes numerous photos, tables and figures to clearly illustrate information. Based on collaboration between international experts in transgender health, this book is an essential guide for health care professionals, educators, students, patients and patients\u2019 families concerning the psychological, hormonal, surgical and social support of transgender individuals

Imaging

The goal of male to female (MtoF) sex reassignment surgery (SRS) is to provide an aesthetically attractive and functional result, which permits the new female effortless intromission, preserving the potential for orgasm. Although many of these patients would benefi t from imaging investigation, either to plan SRS or to manage postoperative complications, imaging is not routinely performed in the standard clinical practice. This likely arises, at least in part, from the lack of confidence of most radiologists with the pelvic anatomy after genital reconfi guration and possible postoperative complications