Guest Editor's Remarks

The 2019 Toronto Symposium, THE VIENNA PROTOCOL: Medicine's Confrontation with Continuing Legacies of its Nazi Past, was sponsored by Biomedical Communications, Institute of Medical Science, Temerty Faculty of Medicine, University of Toronto and the Neuberger Centre for Holocaust Education. https://www.holocaustcentre.com/hew-2019/the-vienna-protocol Prof. Leila Lax, coordinated the Symposium and was inspired by its presenters to create an online collection of Holocaust education resources. She is grateful to the Editor-in-Chief, Gary Schnitz and the Journal of Biocommunication Management Board for their dedication to scholarship, ethics, and the advancement of knowledge, in support of this Special Issue, that deals with contemporary controversies from a dark time in history, that is part of our professional legacy - and memory. This Special Issue is dedicated to the memory of the victims portrayed in the Pernkopf atlas. Image credit: Table of Contents image provided by the Medical University of Vienna, MUW-AD-003250-5-ABB-151.

Prolonged Dark Time Within A 24-h Light Regime Improves Eggshell Quality by Enhancing Calcium Deposition in Laying Hens

Background: The absorption and transportation of calcium and phosphorus is mainly relied on their corresponding transporters. Eggshell is mainly formed during dark time in one egg cycle. The aim of this study was to determine the effect of different light regime on eggshell quality and the expression of the relevant calcium and phosphorus transporters in laying hens. Seventy two 56-week-old laying hens were randomly divided into two groups and subjected to the following treatments: 16 h light: 8 h dark (control) and 9 h light: 15 h dark (LDP). The expression of phosphorus transporters type IIb Na/Pi co-transporter NaPi-IIa (NPt2a) and NaPi-IIb (NPt2b), calcium transporter calbindin-D28k (CaBP-D28k), and plasma membrane Ca ATPase 1b (PMCA1b) were measured in small intestine, kidney, and eggshell gland. Results: The results showed that the feed intake (P < 0.001) and egg weight (P = 0.05) was decreased by LDP treatment, while laying rate, egg production, and feed efficiency were not significantly influenced (P > 0.05). Compared to control, eggshell hardness was increased (P < 0.05) by LDP treatment whereas eggshell thickness and eggshell percentage were not significant changed. Eggshell calcium (Ca) and phosphorus (P) contents were elevated in LDP-hens, compared to control birds. Compared to control birds, serum Ca (P < 0.01) and P levels (P = 0.079) at dark time were increased in LDP-hens while and alkaline phosphatase (ALP) activity was lowered (P < 0.05). The protein expression levels of CaBP-D28k and PMCA1b were not influenced in duodenum but were decreased at light time in jejunum of LDP hens. In kidney, the expression of CaBP-D28k, PMCA1b and NPt2a were not changed by LDP treatment. In eggshell gland, however, the expression of CaBP-D28k and osteopontin (OPN) were relative higher in LDP hens compared to control birds, whereas the PMCA1b expression was not altered. Conclusions: The result indicates that the increased circulating Ca and P concentrations in dark time are favorable for the deposition of calcium and phosphorus in eggshell. The result offers an alternative strategy for the laying hen with a worse eggshell problem.

Automation of the AST3 optical sky survey from Dome A, Antarctica

ABSTRACT The 0.5-m Antarctic Survey Telescopes (AST3) were designed for time-domain optical/infrared astronomy. They are located in Dome A, Antarctica, where they can take advantage of the continuous dark time during winter. Since the site is unattended in winter, everything for the operation, from observing to data reduction, had to be fully automated. Here, we present a brief overview of the AST3 project and some of its unique characteristics due to its location in Antarctica. We summarize the various components of the survey, including the customized hardware and software, that make complete automation possible.

Influence of day period on labour safety at maintenance and repair of catenary facilities

The paper investigates an influence of day period on labour safety of workers that are engaged at maintenance and repair of catenary facilities. It also considers electric traumatism occasions that took place on catenary for the period of 2012– 2019. The author has carried out a verification of significance of difference between values of electric traumatism frequency coefficient in daylight time and in the period of evening civil twilight, along with in dark time and in the period of evening civil twilight. For the selection of principles of comparison of average values he has calculated variance of the considered values and with the use of Fisher criterion has carried out an assessment of the significance of difference of these variances. The author has also considered lighting systems that are used during execution of works in dark day period on railway catenary facilities. As a result, further directions of research on influence of day period on labour safety of employees of the JSC Russian Railways are determined.