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... In embryonic development of the leech HeMdeUa triaerialis,each of the four paired ectodermal teloblasts contributes some progeny to a characteristic dorsal or ventral territory of the epidermis. To ascertain the relative roles of cell lineage and cell interactions in generating the highly regular ep ...
... In embryonic development of the leech HeMdeUa triaerialis,each of the four paired ectodermal teloblasts contributes some progeny to a characteristic dorsal or ventral territory of the epidermis. To ascertain the relative roles of cell lineage and cell interactions in generating the highly regular ep ...
Lethality of radioisotopes in early mouse embryos
... label. This was achieved by the addition of non-radioactive methionine to the culture medium. Results of such an experiment are shown in Table 1. It is clear that survival can indeed be increased by lowering the specific activity to 002 Ci/mmol. Furthermore, it could be shown, in separate experiment ...
... label. This was achieved by the addition of non-radioactive methionine to the culture medium. Results of such an experiment are shown in Table 1. It is clear that survival can indeed be increased by lowering the specific activity to 002 Ci/mmol. Furthermore, it could be shown, in separate experiment ...
11-13-12 Meiosis FILL IN THE BLANK NOTES
... that are involved in _________________________________________________________________. ___________________- two cylindrical cellular structures that form at the poles of a cell during meiosis. ...
... that are involved in _________________________________________________________________. ___________________- two cylindrical cellular structures that form at the poles of a cell during meiosis. ...
REACTION OF THE GOBLET CELLS TO THE CHOLINERGIC
... stimulated to discharge their mucus (Graph 3). After administration 0.1 mg of acetylcholine the reaction was more prolongated. A marked increase in the number of non stimulated goblet cells, encountered 20 min after administration of 0.5 mg of acetylcholine, reflected the accelerated differentiation ...
... stimulated to discharge their mucus (Graph 3). After administration 0.1 mg of acetylcholine the reaction was more prolongated. A marked increase in the number of non stimulated goblet cells, encountered 20 min after administration of 0.5 mg of acetylcholine, reflected the accelerated differentiation ...
Break of symmetry in regenerating tobacco protoplasts is
... cases of symmetrical, freely accessible cells, which undergo formative divisions, are rare in higher plants. As an alternative to studying polarity induction de novo, polarity can be artificially eliminated by digesting the cell wall with cellulases. This tabula rasa approach yields protoplasts, whic ...
... cases of symmetrical, freely accessible cells, which undergo formative divisions, are rare in higher plants. As an alternative to studying polarity induction de novo, polarity can be artificially eliminated by digesting the cell wall with cellulases. This tabula rasa approach yields protoplasts, whic ...
Motor protein control of ion flux is an early step in embryonic left
... alternatively provide electro-motive force which electrophoresis charged factors through gap junction paths in a consistent direction. It should also be noted that the systems of cytoplasmic motor transport, ion flux, and large-scale gap junctional paths together provide a way to resolve the questio ...
... alternatively provide electro-motive force which electrophoresis charged factors through gap junction paths in a consistent direction. It should also be noted that the systems of cytoplasmic motor transport, ion flux, and large-scale gap junctional paths together provide a way to resolve the questio ...
hTERT Inhibition Triggers Epstein–Barr Virus Lytic Cycle and
... and several histone deacetylase inhibitors (9–12). EBVcarrying tumor cells may also be killed by prodrugs, such as ganciclovir or radiolabeled nucleoside analogs, which are activated by EBV lytic proteins, such as the viral thymidine kinase (9, 13, 14). Notably, combined treatment with arginine buty ...
... and several histone deacetylase inhibitors (9–12). EBVcarrying tumor cells may also be killed by prodrugs, such as ganciclovir or radiolabeled nucleoside analogs, which are activated by EBV lytic proteins, such as the viral thymidine kinase (9, 13, 14). Notably, combined treatment with arginine buty ...
Cells - MCQ topic quiz
... © OCR 2016 - This resource may be freely copied and distributed, as long as the OCR logo and this message remain intact and OCR is acknowledged as the originator of this work. OCR acknowledges the use of the following content: n/a Please get in touch if you want to discuss the accessibility of resou ...
... © OCR 2016 - This resource may be freely copied and distributed, as long as the OCR logo and this message remain intact and OCR is acknowledged as the originator of this work. OCR acknowledges the use of the following content: n/a Please get in touch if you want to discuss the accessibility of resou ...
7-2 Eukaryotic Cell Structure
... Structures within a eukaryotic cell that perform important cellular functions are known as organelles. Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The Cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentic ...
... Structures within a eukaryotic cell that perform important cellular functions are known as organelles. Cell biologists divide the eukaryotic cell into two major parts: the nucleus and the cytoplasm. The Cytoplasm is the portion of the cell outside the nucleus. Slide 3 of 49 Copyright Pearson Prentic ...
Exit from dormancy in microbial organisms
... response to micromolar concentrations of peptidoglycan-derived muropeptides consisting of a disaccharide–tripeptide with a meso-diaminopimelic acid (m-DAP) residue at the third position of the stem peptide15 (FIG. 1a). Growing bacteria, especially Gram-positive species, release large quantities of p ...
... response to micromolar concentrations of peptidoglycan-derived muropeptides consisting of a disaccharide–tripeptide with a meso-diaminopimelic acid (m-DAP) residue at the third position of the stem peptide15 (FIG. 1a). Growing bacteria, especially Gram-positive species, release large quantities of p ...
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... stimulates β cell insulin secretion (Kawai et al., 1995; Kawamori and Kulkarni, 2009). Dysregulation of insulin and glucagon signaling consequent to β cell dysfunction or destruction causes diabetes mellitus, a devastating disease that afflicts more than 360 million people worldwide (Whiting et al., ...
... stimulates β cell insulin secretion (Kawai et al., 1995; Kawamori and Kulkarni, 2009). Dysregulation of insulin and glucagon signaling consequent to β cell dysfunction or destruction causes diabetes mellitus, a devastating disease that afflicts more than 360 million people worldwide (Whiting et al., ...
File - wHOOSe Learning
... Structural adaptations include such things as body color, body covering, beak type, and claw type. Organisms also have behavioral adaptations, or certain types of activities they perform, which help them meet a life need. Organisms have structures uniquely adapted for their particular needs. A seed- ...
... Structural adaptations include such things as body color, body covering, beak type, and claw type. Organisms also have behavioral adaptations, or certain types of activities they perform, which help them meet a life need. Organisms have structures uniquely adapted for their particular needs. A seed- ...
Lysis by Agents of Microbial Origin
... examples of micro-organisms or microbial products digesting the cells of various bacteria have often been reported since the very beginnings of bacteriology. Research in this field was undertaken from many different angles according to the fashion of the day. Early studies were mostly conducted with ...
... examples of micro-organisms or microbial products digesting the cells of various bacteria have often been reported since the very beginnings of bacteriology. Research in this field was undertaken from many different angles according to the fashion of the day. Early studies were mostly conducted with ...
PowerPoint format
... virus circulates in the body of the insect. In Persistent transmission the aphid retains the virus in its body for days or weeks spreading it to many plants as it moves and feeds. ...
... virus circulates in the body of the insect. In Persistent transmission the aphid retains the virus in its body for days or weeks spreading it to many plants as it moves and feeds. ...
Contract Monoclonal Antibody Production
... week intervals with an appropriate adjuvant. The first test bleeds are taken 1-2 weeks following the initial immunization and the peripheral blood sera are titered with an optimized antibody screening assay. Modified to satisfy specified requirements, this screening can consist of ELISA, radioimmuno ...
... week intervals with an appropriate adjuvant. The first test bleeds are taken 1-2 weeks following the initial immunization and the peripheral blood sera are titered with an optimized antibody screening assay. Modified to satisfy specified requirements, this screening can consist of ELISA, radioimmuno ...
Fe Sparing and Fe Recycling Contribute to
... cells/mL (Figure 2A). The chlorophyll content in the –Fe cultures was reduced already after 1 d corresponding to the decrease in intracellular Fe content and eventually reached a new steady state, as noted previously (Figure 2B). In the first 24 h of Fe starvation, there was no impact on cell divisio ...
... cells/mL (Figure 2A). The chlorophyll content in the –Fe cultures was reduced already after 1 d corresponding to the decrease in intracellular Fe content and eventually reached a new steady state, as noted previously (Figure 2B). In the first 24 h of Fe starvation, there was no impact on cell divisio ...
Human skin cells support thymus- independent T cell development
... ± 2.8 × 104; n = 6 representative experiments, each containing 12–40 individual matrices). In addition to T cells, we observed production of CD14loHLA-DRhi DCs (approximately 20–40%), CD14+ myeloid cells, and a variable number of CD56+ cells (data not shown). We next studied the kinetics of T cell m ...
... ± 2.8 × 104; n = 6 representative experiments, each containing 12–40 individual matrices). In addition to T cells, we observed production of CD14loHLA-DRhi DCs (approximately 20–40%), CD14+ myeloid cells, and a variable number of CD56+ cells (data not shown). We next studied the kinetics of T cell m ...
Cold Hardiness of Woody Plants
... that occur. Other chemical changes are known to occur in the cells associated with cold acclimation, such as changes in quantity and kinds of proteins, but these changes are difficult to translate into specific benefits to the tissues. Cell membranes are known to become increasingly permeable to wat ...
... that occur. Other chemical changes are known to occur in the cells associated with cold acclimation, such as changes in quantity and kinds of proteins, but these changes are difficult to translate into specific benefits to the tissues. Cell membranes are known to become increasingly permeable to wat ...
From DEPARTMENT OF MEDICAL
... between Wnt1 and Wnt5a in mDA neuron development in vivo. Based on these results, we developed a combined Wnt protocol to promote the generation of mDA neurons from neural and embryonic stem cells in vitro. We conclude that coordinated Wnt actions promote mDA neuron development in vivo and in stem c ...
... between Wnt1 and Wnt5a in mDA neuron development in vivo. Based on these results, we developed a combined Wnt protocol to promote the generation of mDA neurons from neural and embryonic stem cells in vitro. We conclude that coordinated Wnt actions promote mDA neuron development in vivo and in stem c ...
Role for a bidentate ribonuclease in the initiation step of RNA
... interference6. This enzyme was isolated from Drosophila S2 cells in which RNAi had been initiated in vivo by transfection with doublestranded RNA (dsRNA). We ®rst investigated whether the RISC enzyme, and the enzyme that initiates RNAi through processing of dsRNA into 22-nucleotide sequences, are di ...
... interference6. This enzyme was isolated from Drosophila S2 cells in which RNAi had been initiated in vivo by transfection with doublestranded RNA (dsRNA). We ®rst investigated whether the RISC enzyme, and the enzyme that initiates RNAi through processing of dsRNA into 22-nucleotide sequences, are di ...
In vitro study of chorionic and ectoplacental
... origin has been assigned to the syncytial layer, which would then arise from the Langhans cells (Carter, 1964; Enders, 19656; Kemnitz, 1970). Midgley, Pierce, Deneau & Gosling (1963), Tao & Hertig (1965) and Gerbie, Hathaway & Brewer (1968), using [3Hlthymidine as a cell tracer, have obtained data i ...
... origin has been assigned to the syncytial layer, which would then arise from the Langhans cells (Carter, 1964; Enders, 19656; Kemnitz, 1970). Midgley, Pierce, Deneau & Gosling (1963), Tao & Hertig (1965) and Gerbie, Hathaway & Brewer (1968), using [3Hlthymidine as a cell tracer, have obtained data i ...
Toxoplasma gondii Intracellular Parasite Perforin Trigger Rapid
... presumably to prevent premature death of their host cells, be it an innate response to the infection or induced by immune cells upon recognition (1). Recent reports indicate that other intracellular pathogens such as protozoa and certain bacteria are also able to interfere with apoptosis induction a ...
... presumably to prevent premature death of their host cells, be it an innate response to the infection or induced by immune cells upon recognition (1). Recent reports indicate that other intracellular pathogens such as protozoa and certain bacteria are also able to interfere with apoptosis induction a ...
The necessary junk: new functions for transposable elements
... pathways to inhibit retrotransposition; these pathways are now being elucidated. Recent evidence has linked miRNA and siRNA pathways with retrotransposon inhibition. In Drosophila, a novel, repeat-associated small interfering RNAs (rasiRNAs) homologous to the retrotransposons’ antisense strand have ...
... pathways to inhibit retrotransposition; these pathways are now being elucidated. Recent evidence has linked miRNA and siRNA pathways with retrotransposon inhibition. In Drosophila, a novel, repeat-associated small interfering RNAs (rasiRNAs) homologous to the retrotransposons’ antisense strand have ...
Cellular differentiation
In developmental biology, cellular differentiation isa cell changes from one cell type to another. Most commonly this is a less specialized type becoming a more specialized type, such as during cell growth. Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types. Differentiation continues in adulthood as adult stem cells divide and create fully differentiated daughter cells during tissue repair and during normal cell turnover. Some differentiation occurs in response to antigen exposure. Differentiation dramatically changes a cell's size, shape, membrane potential, metabolic activity, and responsiveness to signals. These changes are largely due to highly controlled modifications in gene expression and are the study of epigenetics. With a few exceptions, cellular differentiation almost never involves a change in the DNA sequence itself. Thus, different cells can have very different physical characteristics despite having the same genome.A cell that can differentiate into all cell types of the adult organism is known as pluripotent. Such cells are called embryonic stem cells in animals and meristematic cells in higher plants. A cell that can differentiate into all cell types, including the placental tissue, is known as totipotent. In mammals, only the zygote and subsequent blastomeres are totipotent, while in plants many differentiated cells can become totipotent with simple laboratory techniques. In cytopathology, the level of cellular differentiation is used as a measure of cancer progression. ""Grade"" is a marker of how differentiated a cell in a tumor is.