Cell fate specification in the early C. elegans embryo requires the activity of a family of proteins with CCCH zinc-finger motifs. Two members of the family, MEX-5 and MEX-6, are enriched in the anterior of the early embryo where they inhibit the accumulation of posterior proteins. Embryos from mex-5 single-mutant mothers are inviable due to the misexpression of SKN-1, a transcription factor th...

The KH domain protein MEX-3 is central to the temporal and spatial control of PAL-1 expression in the C. elegans early embryo. PAL-1 is a Caudal-like homeodomain protein that is required to specify the fate of posterior blastomeres. While pal-1 mRNA is present throughout the oocyte and early embryo, PAL-1 protein is expressed only in posterior blastomeres, starting at the four-cell stage. To be...

A sensitive HPLC method combined with a column-switching system and tris(bipyridine)ruthenium(III) electrogenerated chemiluminescence (ECL) detection has been developed for the quantitative determination of mexiletine (MEX). MEX was derivatized by divinylsulfone (DVS) and then measured. The optimum conditions for the derivatization reaction were 10 µL of sample solutions, 40 mM DVS (pH 8.0), a ...

Cell polarity is characterized by the asymmetric distribution of factors at the cell cortex and in the cytoplasm. Although mechanisms that establish cortical asymmetries have been characterized, less is known about how persistent cytoplasmic asymmetries are generated. During the asymmetric division of the Caenorhabditis elegans zygote, the PAR proteins orchestrate the segregation of the cytopla...

BACKGROUND AND AIMS Most studies of exodermal structure and function have involved species with a uniseriate exodermis. To extend this work, the development and apoplastic permeability of Iris germanica roots with a multiseriate exodermis (MEX) were investigated. The effects of different growth conditions on MEX maturation were also tested. In addition, the exodermises of eight Iris species wer...

Crystallographical characterization of nanocrystals PbS doped with Ni Javier Martínez-Juárez,a Oscar Portillo-Moreno,b Melissa ChávezPortillo,a Joel Díaz-Reyes,c Rosendo Lozada-Morales,d and Gabriel Juárez-Díaz,a aPosgrado en Dispositivos Semiconductores, Instituto de Ciencias, BUAP, Puebla, 14 Sur Esquina San Claudio, Ciudad Universitaria Edif. 103 C, C. P. 72570, (Mex). bFCQ, BUAP(Mex), cCIBA...

We present a very simple, free tool for parallelizing calculations under Matlab in multicore and cluster environments. After the installation it does not use any compilers, MEX files, disk files, etc. It is compatible with the old Paralize package, but allows the involved cores/machines to do other jobs when a worker core/machine is not busy.

We present a very simple, reliable, efficient and free tool for parallelizing calculations under Matlab in multicore and cluster environments. It does not use any compilers, MEX files, disk files, etc.. It is compatible with old Paralize package, but allows the involved cores/machines to do other jobs when a server is not busy.

An asymmetrical network of cortically localized PAR proteins forms shortly after fertilization of the C. elegans egg. This network is required for subsequent asymmetries in the expression patterns of several proteins that are encoded by nonlocalized, maternally expressed mRNAs. We provide evidence that two nearly identical genes, mex-5 and mex-6, link PAR asymmetry to those subsequent protein a...

In the nematode Caenorhabditis elegans, germ cells arise from early embryonic cells called germline blastomeres. Cytoplasmic structures called P granules are present in the fertilized egg and are segregated into each of the germline blastomeres during the first few cleavages of the embryo. Mutations in the maternally expressed gene mex-1 disrupt the segregation of P granules, prevent the format...