Comparative Study of Expansion and Proliferation of Adult Mice Mesenchymal Stem Cells Derived from Bone Marrow and Adipose Tissue

The importance of Mesenchymal stem cells (MSCs) represents a favorable tool for new clinical concepts in supporting tissue engineering and cellular therapy. Bone marrow (BM) was considered important source contain mesenchymal stem cells .Another promising source of MSCs is adipose tissue (AT). MSCs derived from these sources compared regarding morphology, the success rate of isolating MSCs, expansion potential by rate of colony forming and immune phenotype. The obtained results from this study showed no obvious considerable differences concerning the morphology and immune phenotype of the MSCs derived from these sources were obvious. Differences observed concerning to the success rate of isolating MSCs, which was approximately more than 90% for BM, while it reached about 70% for AT after seven days of culturing, as well as the rate of colony forming was lower in AT cells in comparison to that obtained in BM at the same period. However, AT-MSCs could be required longest time to complete monolayer confluence, whereas BM-MSCs had the shortest proliferation period. Cells from both sources determined according to immunohistochemistry by CD105+ and CD34.¯ Conclusions revealed that MSCs can easily and successfully obtained from bone marrow and adipose tissues, and both tissues appears suitable sources of stem cells for potential use in regenerative medicine, repairing damaged tissue nevertheless the BM-MSCs more effectual in expansion and proliferation.

Neurochemical phenotype and birthdating of specific cell populations in the chick retina

The chick embryo is one of the most traditional models in developing neuroscience and its visual system has been one of the most exhaustively studied. The retina has been used as a model for studying the development of the nervous system. Here, we describe the morphological features that characterize each stage of the retina development and studies of the neurogenesis period of some specific neurochemical subpopulations of retinal cells by using a combination of immunohistochemistry and autoradiography of tritiated-thymidine. It could be concluded that the proliferation period of dopaminergic, GABAergic, cholinoceptive and GABAceptive cells does not follow a common rule of the neurogenesis. In addition, some specific neurochemical cell groups can have a restrict proliferation period when compared to the total cell population.

The Influence of the Marine Bacterium Vibrio Natriegens Growth on Metallic Corrosion as Studied by Microscope Technologies

Biofilm formation and the adsorption of nonsulfate-reducing marine bacterium Vibrio natriegens (V. natriegen) to different metallic surfaces have been studied by atomic force microscopy (AFM). The nature of extracellular polymeric substance (EPS) has been monitored through the force-distance curve. EPS may act as adhesive binding adjacent cells and thus further enhance the aggregation of microbes during cluster formation due to its adhesiveness in nature. The AFM images supply the change of the morphology of microbial cells and colonies, the distribution of microbial colonies and the presence of EPS on the surfaces with immersion. Results show that the biofilms formed on the surfaces increase in thickness and heterogeneity with time and that 3~7 days is the proliferation period of the bacteria on metallic surfaces. The corrosion type of the metals by V. natriegens could be confirmed as typical pitting attack through scanning electron microscopy (SEM) observation.

In vitro rooting and anatomical study of leaves and roots of in vitro and ex vitro plants of Prunus x davidopersica 'Piroska'

The process of in vitro rooting and the anatomical characters of in vitro and ex vitro leaves and roots of Prunus x davidopersica 'Piroska' were studied. Best rooting percentage (50%) and highest root number (5.0) was achieved in spring on a medium containing 0.1 mg/I NAA + 30 g/1 glucose. At the end of rooting the parenchyma of the in vitro leaves was more loose and spongy, than during the proliferation period. In the first newly developed leaf of an acclimatised plant, the parenchyma was much more developed, contained less row of cells and less air space too, compared to the leaves developed in the field. The in vitro developed root had a broad cortex and narrow vascular cylinder with less developed xylem elements, but at the end of the acclimatisation the vascular system became dominant in the root.

Genetic and developmental characteristics of the homeotic mutation bx1 of Drosophila

The mutations at the bithorax locus produce a transformation of anterior haltere into anterior wing. The bx1 allele presents unusual features when compared with other bx alleles. The phenotype of bx1 homozygotes is temperature sensitive but only with regard to the distal and not to the proximal transformation, thus suggesting two different components in the bithorax transformation. The phenotype of bx1 homozygotes is stronger than that of bx1 over the deletion of the gene, suggesting a trans interaction of the bx1 chromosomes which results in mutual partial inactivation. We show by temperature shift and clonal analysis experiments that the decision on whether to differentiate haltere or wing structures is taken at the end of the proliferation period of the mutant disc.