Leaf epidermal studies of three species of Acalypha Linn.
... The aim of this work is to distinguish some Acalypha species existing in Nigeria by stomatal and trichomes types and the significance of the study is to contribute useful new characters to assess the identification and taxonomic position of species in the future studies of Acalypha species. Thus, pr ...
... The aim of this work is to distinguish some Acalypha species existing in Nigeria by stomatal and trichomes types and the significance of the study is to contribute useful new characters to assess the identification and taxonomic position of species in the future studies of Acalypha species. Thus, pr ...
Processing of human cytomegalovirus envelope glycoproteins in
... MrS of the gB glycoproteins synthesized in SF and U373MG cells and the disulphide-linked complexes formed by gB were compared by S D S - P A G E . When isolated from SF cells the most abundant disulphidelinked complexes had M:s of 150000 and 250000 (Fig. 2a, lane 1); a minor component with an Mr of ...
... MrS of the gB glycoproteins synthesized in SF and U373MG cells and the disulphide-linked complexes formed by gB were compared by S D S - P A G E . When isolated from SF cells the most abundant disulphidelinked complexes had M:s of 150000 and 250000 (Fig. 2a, lane 1); a minor component with an Mr of ...
Induction of apoptosis by the Amsacta moorei entomopoxvirus
... Our results show that replication of the viral genome triggers caspase activation in the highly productive LD-652 cells. To investigate the role of caspases in viral infection, we infected the cells in the presence of broad spectrum caspase inhibitors, Q-VD-OPH and Z-VAD-FMK (Fig. 7). A recombinant ...
... Our results show that replication of the viral genome triggers caspase activation in the highly productive LD-652 cells. To investigate the role of caspases in viral infection, we infected the cells in the presence of broad spectrum caspase inhibitors, Q-VD-OPH and Z-VAD-FMK (Fig. 7). A recombinant ...
Inter-specific scaling of phytoplankton production and cell size in the
... The high values of the size scaling exponent for production rate confirm recent measurements which indicated that the size scaling of phytoplankton photosynthesis in the ocean is approximately isometrical (Marañón et al., 2007). A likely explanation for this departure from the 34-power rule lies i ...
... The high values of the size scaling exponent for production rate confirm recent measurements which indicated that the size scaling of phytoplankton photosynthesis in the ocean is approximately isometrical (Marañón et al., 2007). A likely explanation for this departure from the 34-power rule lies i ...
Effect of Colchicine on Human Tissues.
... 1. Colchicine exerts a toxic effect on living cells which commonly results in the arrest of the process of mitosis at an early stage, usually the metaphase, with the production of bizarre and abnormal ...
... 1. Colchicine exerts a toxic effect on living cells which commonly results in the arrest of the process of mitosis at an early stage, usually the metaphase, with the production of bizarre and abnormal ...
From segment to somite: Segmentation to
... Fig. 2. The model mechanisms underlying somite segmentation. A: An illustration of the anteroposterior (AP) axis and the various stages of somite formation according to the clock and wavefront model. The posterior presomitic mesoderm (PSM; shown in light gray) is homogeneous and cells are undetermin ...
... Fig. 2. The model mechanisms underlying somite segmentation. A: An illustration of the anteroposterior (AP) axis and the various stages of somite formation according to the clock and wavefront model. The posterior presomitic mesoderm (PSM; shown in light gray) is homogeneous and cells are undetermin ...
Agriculturae Conspectus Scientificus
... 3A and 3C). The callose deposits were quite abundant in cell walls of idioblasts (Figs 3B and 3D). No visible differences in callose deposits between idioblasts walls in spongy parenchyma of both cultivars were noticed, but there were significant differences (p < 0.05) in number of idioblasts per cr ...
... 3A and 3C). The callose deposits were quite abundant in cell walls of idioblasts (Figs 3B and 3D). No visible differences in callose deposits between idioblasts walls in spongy parenchyma of both cultivars were noticed, but there were significant differences (p < 0.05) in number of idioblasts per cr ...
the peroxisomal endomembrane system and the role of the ER
... large pleomorphic structures reminiscent of the mammalian peroxisomal reticulum (Mullen et al., 2006) and are engaged in ER-destined retrograde vesicular flow (Fig. 1). Evidence for this latter conclusion comes from observations that when the tomato bushy stunt virus (TBSV) replication protein p33 i ...
... large pleomorphic structures reminiscent of the mammalian peroxisomal reticulum (Mullen et al., 2006) and are engaged in ER-destined retrograde vesicular flow (Fig. 1). Evidence for this latter conclusion comes from observations that when the tomato bushy stunt virus (TBSV) replication protein p33 i ...
The onset of pigment epithelial proliferation after retinal
... parallel to the original monolayer. Their nuclear membranes are more scalloped than those of normal RPE cell nuclei, and the usual apical-basal surface polarity is not evident. The cell surfaces are lined with many short, undifferentiated processes that sometimes interdigitate with similar processes ...
... parallel to the original monolayer. Their nuclear membranes are more scalloped than those of normal RPE cell nuclei, and the usual apical-basal surface polarity is not evident. The cell surfaces are lined with many short, undifferentiated processes that sometimes interdigitate with similar processes ...
Aging and Mitochondria - SENS Research Foundation
... – Digest old collagen and synthesize new… in exactly the right pattern. ...
... – Digest old collagen and synthesize new… in exactly the right pattern. ...
Phorbol Esters Alter Cell Fate during Development of Sea Urchin
... led us to investigate the changes in gene expression in TPAtreated embryos, as assessed by RNA accumulation. A number of genes have been isolated in sea urchins that by the early gastrula stage are restricted in expression to mesoderm (Benson et ai., 1987), endoderm (Nocente-McGrath et al., 1989), o ...
... led us to investigate the changes in gene expression in TPAtreated embryos, as assessed by RNA accumulation. A number of genes have been isolated in sea urchins that by the early gastrula stage are restricted in expression to mesoderm (Benson et ai., 1987), endoderm (Nocente-McGrath et al., 1989), o ...
Lysosomal Heterogeneity in Exocrine Acinar Cells
... Acid phosphatase (AcPase) has long been recognized as the marker enzyme for lysosomes (3). In exocrine secretory cells (2,4), AcPase activity is localized in GERL, immature secretory granules, and some, but not all, lysosomes (Figure 1). The lysosomes that possess AcPase activity are generally locat ...
... Acid phosphatase (AcPase) has long been recognized as the marker enzyme for lysosomes (3). In exocrine secretory cells (2,4), AcPase activity is localized in GERL, immature secretory granules, and some, but not all, lysosomes (Figure 1). The lysosomes that possess AcPase activity are generally locat ...
The tubulin gene family of Paramecium: Characterization and
... - The ciliated protozoan Paramecium harbours a particularly large diversity of microtubule networks, ranging from the elaborate and stable ciliary axonemes and basal bodies to very dynamic cytoplasmic, cortical or intranuclear arrays. Their organization and individual cycle of assembly/disassembly a ...
... - The ciliated protozoan Paramecium harbours a particularly large diversity of microtubule networks, ranging from the elaborate and stable ciliary axonemes and basal bodies to very dynamic cytoplasmic, cortical or intranuclear arrays. Their organization and individual cycle of assembly/disassembly a ...
Nucleolus: the fascinating nuclear body
... UBF, close to Wbrillarin-containing caps. In the central body are proteins derived from the GC, some of which are progressively released, such as PM-Scl 100. It was recently demonstrated that certain nucleolar caps of segregated nucleoli could recruit factors involved in mRNA splicing. In this case, ...
... UBF, close to Wbrillarin-containing caps. In the central body are proteins derived from the GC, some of which are progressively released, such as PM-Scl 100. It was recently demonstrated that certain nucleolar caps of segregated nucleoli could recruit factors involved in mRNA splicing. In this case, ...
Embryonic stem cells form an organized, functional
... pacemaking-contracting units in EBs. Both the minK-lacZ transgene and the cGATA6 enhancer mark regions of the cardiac pacemaking and conducting system in vivo. We first examined the expression of the minK-lacZ transgene in EBs to determine whether cells expressing this marker were present in a local ...
... pacemaking-contracting units in EBs. Both the minK-lacZ transgene and the cGATA6 enhancer mark regions of the cardiac pacemaking and conducting system in vivo. We first examined the expression of the minK-lacZ transgene in EBs to determine whether cells expressing this marker were present in a local ...
Development of Conjunctival Goblet Cells and Their
... membranes of goblet cells.3 Although the role of the sympathetic agonists in stimulating goblet cell secretion is unknown, 1- and 2-adrenergic receptor (AR) subtypes appear to be present in goblet cells as well as in stratified squamous cells.6 This evidence suggests that parasympathetic and perh ...
... membranes of goblet cells.3 Although the role of the sympathetic agonists in stimulating goblet cell secretion is unknown, 1- and 2-adrenergic receptor (AR) subtypes appear to be present in goblet cells as well as in stratified squamous cells.6 This evidence suggests that parasympathetic and perh ...
Dominant negative connexin26 mutation R75W causing severe
... Background: The greater epithelial ridge (GER) is a developmental structure in the maturation of the organ of Corti. Situated near the inner hair cells of neonatal mice, the GER undergoes a wave of apoptosis after postnatal day 8 (P8). We evaluated the GER from P8 to P12 in transgenic mice that carr ...
... Background: The greater epithelial ridge (GER) is a developmental structure in the maturation of the organ of Corti. Situated near the inner hair cells of neonatal mice, the GER undergoes a wave of apoptosis after postnatal day 8 (P8). We evaluated the GER from P8 to P12 in transgenic mice that carr ...
Cell Processes
... The endosymbiotic theory suggests that eukaryotes developed when a prokaryotic cell was engulfed by another prokaryotic cell & continued living inside the other cell. One piece of evidence for this is that some organelles have their own DNA. Which of these organelles has its own DNA and is though ...
... The endosymbiotic theory suggests that eukaryotes developed when a prokaryotic cell was engulfed by another prokaryotic cell & continued living inside the other cell. One piece of evidence for this is that some organelles have their own DNA. Which of these organelles has its own DNA and is though ...
Effect of Gibberellic Acid and Actinomycin D on the Formation and
... treated with GA for various periods of time from 9 to 66 hours underwent changes similar to those observed in aleurone cells from germinating grains. Development of stacked RER, which varied somewhat in time of appearance in different experiments, was first observed at 12 hours after GA treatment. A ...
... treated with GA for various periods of time from 9 to 66 hours underwent changes similar to those observed in aleurone cells from germinating grains. Development of stacked RER, which varied somewhat in time of appearance in different experiments, was first observed at 12 hours after GA treatment. A ...
human embryonic stem cells and their clinical relevance
... are quickly depleted as they differentiate to other cell types with more limited developmental potential. However, if the inner cell mass cell is removed from its normal embryonic environment and cultured under appropriate conditions, these cells can continue to proliferate and replicate themselves ...
... are quickly depleted as they differentiate to other cell types with more limited developmental potential. However, if the inner cell mass cell is removed from its normal embryonic environment and cultured under appropriate conditions, these cells can continue to proliferate and replicate themselves ...
Compartmentalisation of Rho regulators directs cell
... Interestingly, mice mutant for p190 RhoGAP show defects in anterior neural tube closure, due to failure in apical constriction and in intracellular re-organisation of the Actin cytoskeleton of neuroepithelial cells (Brouns et al., 2000). Together, these observations suggest that Rho acts apically du ...
... Interestingly, mice mutant for p190 RhoGAP show defects in anterior neural tube closure, due to failure in apical constriction and in intracellular re-organisation of the Actin cytoskeleton of neuroepithelial cells (Brouns et al., 2000). Together, these observations suggest that Rho acts apically du ...
Specific localization of nesprin-1-α2, the short isoform of nesprin
... Background: Nesprin-1-giant (1008kD) is a protein of the outer nuclear membrane that links nuclei to the actin cytoskeleton via amino-terminal calponin homology domains. The short nesprin-1 isoform, nesprin-1-α2, is present only in skeletal and cardiac muscle and several pathogenic mutations occur w ...
... Background: Nesprin-1-giant (1008kD) is a protein of the outer nuclear membrane that links nuclei to the actin cytoskeleton via amino-terminal calponin homology domains. The short nesprin-1 isoform, nesprin-1-α2, is present only in skeletal and cardiac muscle and several pathogenic mutations occur w ...
Two-photon laser scanning microscopy imaging of intact spinal cord and
... CXCR6 independent manner. Unexpectedly, our studies also addressed the molecular basis of T cell infiltration into cortical injury sites in the context of EAE. 1.3. An inflammation model for initiating cortical MS lesions MS is also characterized by cortical lesions with inflammation which may contribu ...
... CXCR6 independent manner. Unexpectedly, our studies also addressed the molecular basis of T cell infiltration into cortical injury sites in the context of EAE. 1.3. An inflammation model for initiating cortical MS lesions MS is also characterized by cortical lesions with inflammation which may contribu ...
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... of general scientific interest due to their multifunctional and complex roles. These structures can also have direct or indirect connections with the cytoskeleton of the cell [16–23] as observed with the microtubules, the main cytoskeletal polymers in trypanosomes. Microtubules are present in the fl ...
... of general scientific interest due to their multifunctional and complex roles. These structures can also have direct or indirect connections with the cytoskeleton of the cell [16–23] as observed with the microtubules, the main cytoskeletal polymers in trypanosomes. Microtubules are present in the fl ...
Mitosis
Mitosis is a part of the cell cycle in which chromosomes in a cell nucleus are separated into two identical sets of chromosomes, each in its own nucleus. In general, mitosis (division of the nucleus) is often followed by cytokinesis, which divides the cytoplasm, organelles and cell membrane into two new cells containing roughly equal shares of these cellular components. Mitosis and cytokinesis together define the mitotic (M) phase of an animal cell cycle—the division of the mother cell into two daughter cells, genetically identical to each other and to their parent cell.The process of mitosis is divided into stages corresponding to the completion of one set of activities and the start of the next. These stages are prophase, prometaphase, metaphase, anaphase, and telophase. During mitosis, the chromosomes, which have already duplicated, condense and attach to fibers that pull one copy of each chromosome to opposite sides of the cell. The result is two genetically identical daughter nuclei. The cell may then divide by cytokinesis to produce two daughter cells. Producing three or more daughter cells instead of normal two is a mitotic error called tripolar mitosis or multipolar mitosis (direct cell triplication / multiplication). Other errors during mitosis can induce apoptosis (programmed cell death) or cause mutations. Certain types of cancer can arise from such mutations.Mitosis occurs only in eukaryotic cells and the process varies in different organisms. For example, animals undergo an ""open"" mitosis, where the nuclear envelope breaks down before the chromosomes separate, while fungi undergo a ""closed"" mitosis, where chromosomes divide within an intact cell nucleus. Furthermore, most animal cells undergo a shape change, known as mitotic cell rounding, to adopt a near spherical morphology at the start of mitosis. Prokaryotic cells, which lack a nucleus, divide by a different process called binary fission.