CDrift: An Algorithm to Correct Linear Drift From A Single High-Resolution STEM Image.

In this work, a new method to determine and correct the linear drift for any crystalline orientation in a single-column-resolved high-resolution scanning transmission electron microscopy (HR-STEM) image, which is based on angle measurements in the Fourier space, is presented. This proposal supposes a generalization and the improvement of a previous work that needs the presence of two symmetrical planes in the crystalline orientation to be applicable. Now, a mathematical derivation of the drift effect on two families of asymmetric planes in the reciprocal space is inferred. However, though it was not possible to find an analytical solution for all conditions, a simple formula was derived to calculate the drift effect that is exact for three specific rotation angles. Taking this into account, an iterative algorithm based on successive rotation/drift correction steps is devised to remove drift distortions in HR-STEM images. The procedure has been evaluated using a simulated micrograph of a monoclinic material in an orientation where all the reciprocal lattice vectors are different. The algorithm only needs four iterations to resolve a 15° drift angle in the image.

Guillain-Barre syndrome and Zika infection: identifying leading producers, countries relative specialization and collaboration.

Zika virus (Zikv) infection implies a significant public health issue due to the different syndromes associated. It is related to several central nervous system problems, such as microcephaly and Guillain-Barre Syndrome. In this way, the first document about the relation of Guillain-Barre Syndrome and Zika indexed in Web of Science was published in 2014. Therefore, the primary goal of the present study is to analyze the leading scientific producers, the relative specialization of the countries and the collaboration network in the research area. A total of 384 manuscripts were identified. Two manuscripts were published in 2014 and 2015; the remaining documents are distributed during 2016 (136), 2017 (186) and 2018 (59) (until April). In conclusion, Zikv and Guillain-Barre Syndrome research has experienced a significant increase in the last years. This may be related to the topic is an important issue of public health concern in the countries affected by Zikv outbreaks. In that sense, Brazil, India and Colombia make a great effort, considering their economic and social resources, in research. However, this study implies a preliminary overview of the research on this topic, a more extended period is needed to define the lines of research and collaboration between countries and authors.