Field-Induced Spin-Density-Wave Phases in Quasi-One-Dimensional Conductors: Theory versus Experiment

We show that "Quantizied Nesting" model misses important features of the magnetic field-induced spin-density-wave (FISDW) phase diagram. Among them are: 1) the FISDW wave vector is not strictly quantized; 2) in some compounds, the FISDW diagram consists of two regions: a) at low temperatures, there are jumps of the wave vector (i.e., the first order transitions between FISDW phases), b) at high temperatures the jumps and the first order transitions disappear but the wave vector is still a non-trivial function of a magnetic field. These are in agreement with the experiments on (TMTSF)2PF6.Comment: 4 pages, 2 figure

Chromosomal, Gestational, and Neonatal Outcomes of Embryos Classified as Mosaic by Preimplantation Genetic Testing for Aneuploidy

To understand the clinical risks associated with the transfer of embryos classified as mosaic by preimplantation genetic testing for aneuploidy. Analysis of multi-center data collected between 2017 and 2023. Patients of infertility treatment. Comparison of pregnancies resulting from embryos classified as euploid or mosaic using the 20-80% interval in chromosomal intermediate copy numbers to define a mosaic result. Rates of spontaneous abortion, birth weight, length of gestation, incidence of birth defects, and chromosomal status during gestation. Implanted euploid embryos had significantly lower risk of spontaneous abortion compared to mosaic embryos (8.9% [n=8672; CI95 8.3,9.5] vs. 22.2% [n=914; CI95 19.6,25.0]). Embryos with mosaicism affecting whole chromosomes (not segmental) had the highest risk of spontaneous abortion (27.6% [n=395; CI95 23.2,32.3]). Babies born from euploid, mosaic, and whole chromosome mosaic embryos had average birth weights and lengths of gestation that were not statistically different (3118g and 267 days [n=488; CI95 3067,3169 and 266,268], 3052g and 265 days [n=488; CI95 2993,3112 and 264,267], 3159g and 268 days [n=194; CI95 3070,3249 and 266,270], respectively). Out of 488 babies from mosaic embryo transfers, one had overt gross abnormalities as defined by the Centers of Disease Controls and Prevention. Most prenatal tests performed on pregnancies from mosaic embryo transfers had normal results, and only three pregnancies produced prenatal test results reflecting the mosaicism detected at the embryonic stage (3 out of 250, 1.2%; CI95 0.25,3.5). While embryos classified as mosaic experience higher rates of miscarriage than euploid embryos (with a particularly high frequency shortly after implantation), babies born of mosaic embryo transfers are similar to babies of euploid embryo transfers. Prenatal testing indicates that mosaicism resolves during most pregnancies, although this process is not perfectly efficient. In a small percentage of cases, the mosaicism persists through gestation. These findings can serve in risk-benefit considerations of mosaic embryo transfers in the fertility clinic

Robotic optical telescopes global network MASTER II. Equipment, structure, algorithms

Presented paper describes the basic principles and features of the implementation of a robotic network of optical telescopes MASTER, designed to study the prompt (simultaneous with gamma radiation) optical emission of gamma-ray bursts and to perform the sky survey to detect unknown objects and transient phenomena. With joint efforts of Sternberg astronomical institute, High altitude astronomical station of the Pulkovo observatory, Ural state university, Irkutsk state university, Blagoveshchensk pedagogical university, the robotic telescopes MASTER II near Kislovodsk, Yekaterinburg, Irkutsk and Blagoveshchensk were installed and tested. The network spread over the longitudes is greater than 6 h. A further expansion of the network is considered. © 2011 Springer Science+Business Media B.V