Development of a novel glycoengineering platform for the rapid production of conjugate vaccines.

Conjugate vaccines produced either by chemical or biologically conjugation have been demonstrated to be safe and efficacious in protection against several deadly bacterial diseases. However, conjugate vaccine assembly and production have several shortcomings which hinders their wider availability. Here, we developed a tool, Mobile-element Assisted Glycoconjugation by Insertion on Chromosome, MAGIC, a novel biotechnological platform that overcomes the limitations of the current conjugate vaccine design method(s). As a model, we focused our design on a leading bioconjugation method using N-oligosaccharyltransferase (OTase), PglB. The installation of MAGIC led to at least twofold increase in glycoconjugate yield via MAGIC when compared to conventional N-OTase based bioconjugation method(s). Then, we improved MAGIC to (a) allow rapid installation of glycoengineering component(s), (b) omit the usage of antibiotics, (c) reduce the dependence on protein induction agents. Furthermore, we show the modularity of the MAGIC platform in performing glycoengineering in bacterial species that are less genetically tractable than the commonly used Escherichia coli. The MAGIC system promises a rapid, robust and versatile method to develop vaccines against serious bacterial pathogens. We anticipate the utility of the MAGIC platform could enhance vaccines production due to its compatibility with virtually any bioconjugation method, thus expanding vaccine biopreparedness toolbox.

Vacuum births and barriers to its use: An observational study in governmental hospitals in Sierra Leone.

OBJECTIVES: Assisted vaginal births (AVD) can prevent unnecessary caesarean sections (CS). The number of CS is increasing rapidly in sub-Saharan Africa; these are still associated with high perioperative mortality rates. The aim of this study is to define the proportion of AVD in governmental hospitals in Sierra Leone and examine barriers to its use. DESIGN: Retrospective observational study of AVD between September 2016 and August 2017. SETTING: A representative selection of Sierra Leonean governmental hospitals (n=11). PARTICIPANT AND INTERVENTION: (a) Data were collected from labour ward records. (b) Health workers involved in labour management were questioned. PRIMARY AND SECONDARY OUTCOME MEASURES: (a) Number of spontaneous, assisted vaginal and caesarean births. (b) Potential barriers to use vacuum-assisted births. RESULTS: (a) Total annual numbers of registered births, AVD and CS were 16 833, 631 (3.7%) and 4642 (27.6%). The proportion of vacuum births ranged from 0.0% to 5.1% across facilities. The proportion of CS ranged from 6.5% to 33.4%. (b) The most frequently reported reasons for limited vacuum use were lack of equipment (25/72; 35%) and insufficient training (18/72; 25%). CONCLUSIONS: The proportion of AVD was particularly low in district facilities, and according to healthcare workers this was mostly due to lack of equipment and insufficient training. Implementing relevant training programmes on the use of vacuum devices and increasing the availability of working devices may increase the proportion of vacuum births in government hospitals in Sierra Leone. This could reduce the number of unnecessary CS.

Automatic layout of structured hierarchical reports.

Domain-specific database applications tend to contain a sizable number of table-, form-, and report-style views that must each be designed and maintained by a software developer. A significant part of this job is the necessary tweaking of low-level presentation details such as label placements, text field dimensions, list or table styles, and so on. In this paper, we present a horizontally constrained layout management algorithm that automates the display of structured hierarchical data using the traditional visual idioms of hand-designed database UIs: tables, multi-column forms, and outline-style indented lists. We compare our system with pure outline and nested table layouts with respect to space efficiency and readability, the latter with an online user study on 27 subjects. Our layouts are 3.9 and 1.6 times more compact on average than outline layouts and horizontally unconstrained table layouts, respectively, and are as readable as table layouts even for large datasets.