Undisturbed culture: a clinical examination of this culture strategy on embryo in vitro development and clinical outcomes.

Objective: To compare the effect of a fully undisturbed culture strategy over a sequential one on embryo in vitro development and clinical outcomes in intracytoplasmic sperm injection (ICSI) cycles.

Design: Retrospective cohort study.

Setting: University-affiliated private IVF center.

The higher the score, the better the clinical outcome: retrospective evaluation of automatic embryo grading as a support tool for embryo selection in IVF laboratories.

Study Question: Is the automatic embryo grading function of specific time-lapse systems clinically useful as a decision support tool for IVF laboratories?

Summary Answer: Blastocyst grading according to the automatic scoring system is directly associated with the likelihood of implantation and live birth, at least in treatments without preimplantation genetic testing for aneuploidy (PGT-A).

What Is Known Already: Several embryo selection algorithms have been described since the introduction of time-lapse technology in IVF laboratories, but no one algorithm has yet been sufficiently consolidated for universal use. Multicentric models based on automated grading systems offer promise for standardization of embryo selection.

Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry-Pérot resonances.

A precise knowledge of the optical properties, specifically the refractive index, of organic/inorganic perovskites, is essential for pushing forward the performance of the current photovoltaic devices that are being developed from these materials. Here we show a robust method for determining the real and the imaginary part of the refractive index of MAPbBr3 thin films and micrometer size single crystals with planar geometry. The simultaneous fit of both the optical transmittance and the photoluminescence spectra to theoretical models defines unambiguously the refractive index and the crystal thickness.

Single Crystal Growth of Hybrid Lead Bromide Perovskites Using a Spin-Coating Method.

Synthesis and studies of single crystals of hybrid perovskite are important for achieving a better understanding of the optoelectronic phenomena occurring in this material and for improving ongoing applications. Here, we report on the growth of micrometer-size single crystals of methylammonium lead bromide (MAPbBr) using the spin coating deposition method on a quartz substrate. We studied the influence of the rotation speed and the use of three different additives -cyclohexyl-2-pyrrolidone, dimethyl sulfoxide, and 4--butylpyridine on the crystal size and shape.