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  • 1
    Electronic Resource
    Electronic Resource
    Stereochemical analysis of prenyltransferase reactions leading to (Z)- and (E)-polyprenyl chains (1987)
    s.l. : American Chemical Society
    Biochemistry 26 (1987), S. 4745-4750 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00389a022
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemistry of the carbon to carbon bond formation in the biosynthesis of polyprepenyl chains with Z double bonds. Studies with undecaprenyl-pyrophosphate synthetase (1985)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 107 (1985), S. 4588-4589 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00301a057
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  • 3
    Electronic Resource
    Electronic Resource
    Light-induced synchrony of cell division in the protonema of the fern, Pteris vittata (1969)
    Springer
    Planta 90 (1969), S. 22-31 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In protonemata of Pteris vittata grown for 6 days under red light, which brings about a marked depression of mitotic activity, the first division of the cells was synchronously induced by irradiation with blue light, and subsequent cell divisions were also promoted. The peak of the mitotic index reached a maximum of about 70% at 11.5 hrs, and 90% of all protonemata divided between the 11th and 13th hour after exposure to blue light. When the protonemata were continuously irradiated with blue light, synchronism of the next cell division in the apical cells decreased to a mitotic index of about 30%, and further divisions occurred randomly. The synchronization of cell division was found to be a combined effect of red and blue light. Red light maintained the cells in the early G1 phase of the cell cycle; blue light caused the cells to progress synchronously through the cell cycle, with an average duration of 12 hr. By using 3H-thymidine, the average duration of the G1, S, G2 and M phases was determined to be about 3.5, 5, 2.5 and 1 hr, respectively. Synchronous cell division could be induced in older protonemata grown for 6 to 12 days in red light and even in protonemata having two cells. It could be repeated in the same protonema by reexposure to red light for 24 hrs or more before another irradiation with blue light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00389293
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  • 4
    Electronic Resource
    Electronic Resource
    Radioautography of incorporated 3H-thymidine and its metabolism during meiotic prophase in microsporocytes of Lilium (1973)
    Springer
    Chromosoma 43 (1973), S. 391-398 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Zygotene cells of Lilium were cultured in the presence of 3H-thymidine for 24 hours and the culture continued in isotope-free medium. Radioautographs of the cells at subsequent stages of meiosis showed the zygotene label to be chromosomal and to be more or less generally distributed over all the chromosomes. Exposure of cells to 3H-thymidine for periods longer than 24 hours resulted in widespread incorporation of thymidine catabolites into a variety of acid-insoluble compounds. Such catabolism is characteristic of meiotic prophase and is virtually absent at premeiotic interphase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406745
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibition of bud initiation by ethyl N-phenylcarbamate results in meiotic development in the yeast Saccharomyces cerevisiae (1983)
    Springer
    Archives of microbiology 134 (1983), S. 171-174 
    Details
    ISSN: 1432-072X
    Keywords: Acetate growth medium ; Anti-microtubule agent ; Bud initiation ; Ethyl N-phenylcarbamate ; Meiosis ; Mitotic cell cycle ; Saccharomyces cerevisiae ; Sporulation induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When diploid cells of Saccharomyces cerevisiae were incubated in acetate growth media containing 2.5 mM ethyl N-phenylcarbamate (EPC), bud initiation was inhibited preferentially, and eventually overgrown, unbudded cells accumulated. During subsequent incubation, meiosis and ascospore formation occurred at high frequencies. The behavior of EPC-treated cells was essentially the same as that of cells transferred to a starvation sporulation medium. EPC thus has a pronounced effect on the mitotic growth of yeast cells, which leads to meiotic development. Our observations indicate that EPC has a decisive function in the initiation of meiosis in rich growth media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407753
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  • 6
    Electronic Resource
    Electronic Resource
    Apogamous sporophyte formation in a fernPteris multifida and its characteristics (1995)
    Springer
    Journal of plant research 108 (1995), S. 181-184 
    Details
    ISSN: 1618-0860
    Keywords: Fern ; Haploid plant ; Induced apogamy ; Meiosis ; Pteris multifida
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When spores of the fern,Pteris multifida, were aseptically cultured in the dark, sporophytic plants were apogamously induced. The plants have been subsequently grown in pots until the development of leaves with many sporangia for observations of meiotic characteristics in their sporocytes. The sporophytic plants originated from spores were estimated to be haploid, and the estimation was supported by abnormal meiosis in sporocytes and the absence of mature spores, but some chromosomes (n=58) formed bivalents in the meiotic process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344342
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  • 7
    Electronic Resource
    Electronic Resource
    Induced apogamous sporophytes inPteris dispar andP. semipinnata, and the meiotic behavior in their sporocytes (1996)
    Springer
    Journal of plant research 109 (1996), S. 369-373 
    Details
    ISSN: 1618-0860
    Keywords: Fern ; Induced apogamy ; Meiosis ; Pteris dispar ; Pteris semipinnata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spores ofPteris dispar andP. semipinnata were aseptically cultured in flasks for apogamous sporophyte induction. Calli or cell colonies similar to calli were induced in cultures supplemented with hormones. Sporophytic leaves subsequently developed from them in hormone-free medium and the young sporophytes were raised into plants with sporangia. Since the wild-type plants having 116 chromosomes are tetraploid, the sporophytic plants originating from spores would appear to be diploid (dihaploid). In induced sporophytes ofP. semipinnata, non-homologous chromosomes (58 univalents) were found during the meiotic process in sporocytes. InP. dispar, however, the meiotic cells showed many bivalent chromosomes (maximum 29ll). These results suggest thatP. semipinnata is allotetraploid, whereasP. dispar is autotetraploid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02344551
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  • 8
    Electronic Resource
    Electronic Resource
    In vitro properties of a chitosan-bonded self-hardening paste with hydroxyapatite granules (1996)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 32 (1996), S. 527-532 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A new self-hardening paste was made by using a combination of chitosan, hydroxyapatite (HA) granules, ZnO, and CaO. The sol was made by dissolving 0.1 g of chitosan in a solution of 0.1 g malic acid and 2.0 mL physiological saline solution. Mixed with 0.03 g of CaO and 0.04 g of ZnO powders was 2.77 g (55 wt %) of HA granules which had a homogeneous pore distribution and a porosity of 35-48%. The size of the granules was set for 0.1-0.3 mm. Kneading and setting of the paste generated a little amount of heat (32.8°C) as compared with the heat produced by polymethyl-methacrylate (PMMA) bone cement (114.5°C). The pH value of chitosan-HA-hardened composite after setting was nearly equal to that of human plasma (pH 7.4), while that of PMMA bone cement maintained an acid pH of 4.7. Hydroxyapatite granules less than 0.1 mm, 0.1-0.3 mm, or 0.3-0.6 mm were set using chitosan sol. The size of the granules did not influence the compressive strength of the set chitosan-HA-hardened composite. The greatest compressive strength of chitosan-HA-hardened composite was obtained by using 55 wt % of HA granules. The strength of the chitosan-HA-hardened composite was comparable to that of the cancellous bone derived from tibial eminentia, but was considerably lower than that of PMMA bone cement. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Hydroxyapatite clay for gap filling and adequate bone ingrowth (1995)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 329-336 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: In uncemented total hip arthroplasty, a complete filling of the gap between femoral prosthesis and the host bone is difficult and defects would remain, because the anatomy of the reamed intramedullary canal cannot fit the prosthesis. Therefore, it seems practical to fill the gap with a clay containing hydroxyapatite (HA), which has an osteoconductive character. The clay (HA clay) is made by mixing HA granules (size 0.1 mm or more) having a homogeneous pore distribution and a porosity of 35-48 vol%, and a viscous substance such as a saline solution of sodium alginate (SSSA). In the first experiment, the ratio of HA granules and sodium alginate in SSSA is set for the same handling properties of HA clay and polymethylmethacrylate bone cement (standard viscosity) before hardening. As a result, the ratio is set for 55 wt% of HA in the clay and 12.5 wt% of sodium alginate in SSSA (i.e., HA:sodium alginate:saline solution = 9.8:1:7). In the second study, the gap between the femoral stem and bone model is completely filled with HA clay. However, the gap is not filled only with HA granules or HA granules mixed with saline solution. In the third animal experiment, using an unloaded model, histology shows that HA clay has an osteoconductive property bridging the gap between the implant and the cortical bone without any adverse reaction. HA clay is considered a useful biomaterial to fill the gap with adequate bone ingrowth. © 1995 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820290308
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  • 10
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    Stereochemistry of the carbon to carbon bond formation in the biosynthesis of polyprepenyl chains with Z double bonds. Studies with undecaprenyl-pyrophosphate synthetase (1985)
    American Chemical Society
    Details
    Publication Date: 1985-07-01
    Print ISSN: 0002-7863
    Electronic ISSN: 1520-5126
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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