Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Chemistry  (3)
  • Aging  (2)
  • Carbene rotational barriers  (2)
  • Chlamydomonas reinhardtii  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Monoamine oxidase-B-positive granular structures in the hippocampus of aged senescence-accelerated mouse (SAMP8) (1995)
    Springer
    Acta neuropathologica 90 (1995), S. 626-632 
    Details
    ISSN: 1432-0533
    Keywords: Key words Monoamine oxidase-B ; Senescence-accelerated mouse (SAM) ; Monoamine ; oxidase-B-positive granular structure ; Periodic ; acid-Schiff-positive granular structure ; Aging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined the histochemical localization of monoamine oxidase in the hippocampus of young and old senescence-accelerated mouse (SAM). We found a monoamine oxidase-B-positive granular structure (MGS) in the hippocampus of old SAMP8, an accelerated senescence-prone line of SAM. The MGS was a round-shaped granular structure of 0.5 to 5 μm diameter and usually formed a cluster, the largest diameter of which ranged from 50 to 150 μm. No MGS were found in the hippocampus of young SAMP8 or of young SAMR1, an accelerated senescence resistant line of SAM, and only few, if any, were seen in old SAMR1. A monoamine oxidase-positive astrocyte was usually observed in the central area of each cluster of MGS. Furthermore, the MGS was in close anatomical relationship with monoamine oxidase-positive astrocytic processes. The enzyme inhibition experiments showed that monoamine oxidase activities localized in the MGS and astrocytes were both predominantly of type B. These findings suggest MGS occurs at least partly in monoamine oxidase-B-positive astrocytes. Furthermore, the MGS was similar to a periodic acid-Schiff-positive granular structure, a polyglucosan body previously documented in the brains of old SAMP8 and some other aged mice strains including C57BL/6 and nude mice, in terms of their size, morphological appearances and topographical distribution in the hippocampus. Thus, the present results suggest that monoamine oxidase type B is a proteinaceous component of the periodic acid-Schiff-positive granular structure in aged mice brains, and might provide some clues for clarifying the mechanisms of age-related occurrence of periodic acid-Schiff-positive granular structures in mice brains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318576
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Rotational isomerism inbis carbene MOL4 complexes: A theoretical study (1984)
    Springer
    Theoretical chemistry accounts 64 (1984), S. 461-467 
    Details
    ISSN: 1432-2234
    Keywords: Carbene rotational barriers ; Isolobal analogy ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract LCAO-MO-SCF calculations are reported for the different stereoisomers of the Mo(CO)4(CH2)2 and Mo(CO)4[C(NH2)2]2 systems. The substitution of the hydrogen atoms by the amino groups in the carbene ligands leads to an almost zero rotational barrier. Steric interactions are therefore expected to govern the barrier for diaminocarbene ligands which are more bulky than C(NH2)2. The rotational isomerism in thesebis carbene MoL4 systems is also discussed in connection with the isolobal analogy between CH2 and C2H4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399238
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Rotational isomerism inbis carbene MOL4 complexes: A theoretical study (1984)
    Springer
    Theoretical chemistry accounts 64 (1984), S. 461-467 
    Details
    ISSN: 1432-2234
    Keywords: Carbene rotational barriers ; Isolobal analogy ; Ab-initio SCF calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract LCAO-MO-SCF calculations are reported for the different stereoisomers of the Mo(CO)4(CH2)2 and Mo(CO)4[C(NH2)2]2 systems. The substitution of the hydrogen atoms by the amino groups in the carbene ligands leads to an almost zero rotational barrier. Steric interactions are therefore expected to govern the barrier for diaminocarbene ligands which are more bulky than C(NH2)2. The rotational isomerism in thesebis carbene MoL4 systems is also discussed in connection with the isolobal analogy between CH2 and C2H4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00554231
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Epifluorescent microscopic studies on the mechanism of preferential destruction of chloroplast nucleoids of male origin in young zygotes ofChlamydomonas reinhardtii (1985)
    Springer
    Protoplasma 125 (1985), S. 43-52 
    Details
    ISSN: 1615-6102
    Keywords: Chlamydomonas reinhardtii ; Chloroplast nucleoidal destruction ; RNA synthesis ; UV interference
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The studies on the kinetics of nucleoid destruction reported here showed that destruction of chloroplast nucleoids (ct nucleoids) of male origin began to occur at about 30 minutes after mixing of male (mt−) and female (mt+) gametes. The timing of initiation of the destruction differed among zygotes but usually occurred during 50–120 minutes after mixing. About 10 minutes was required for complete digestion of the ct nucleoids. UV irradiation on young zygotes or addition of an RNA-synthesis inhibitor, actinomycin D, to the incubation medium during the first 0–30 minutes after mixing almost completely inhibited the incorporation of3H uridine into the cell nuclei and the preferential destruction without inhibiting cell nuclear fusion. These results suggest that soon after mating,de novo RNA synthesis is concerned for the preferential destruction of ct nucleoids. To determine in which of the two cell nuclei in the zygotes the RNA is synthesized, each gamete (mt−, mt+) was irradiated with UV and mated with unirradiated gametes of opposite mating type. This treatment of the male gametes had no effect on the incorporation of3H uridine into cell nuclei and the preferential destruction of ct nucleoids but UV irradiation of female gametes almost completely inhibited the incorporation of3H uridine into cell nuclei and the preferential destruction of ct nucleoids. Similar phenomena occurred in other crosses. The UV effect was photoreactivated in about 50% by white light, suggesting that the UV target is DNA. Thus, RNA synthesized in the cell nucleus of female origin soon after mating may be responsible for the preferential destruction of ct nucleoids of male origin
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297349
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Chloroplast nucleoids in large number and large DNA amount with regard to maternal inheritance inChlamydomonas reinhardtii (1996)
    Springer
    Protoplasma 194 (1996), S. 11-17 
    Details
    ISSN: 1615-6102
    Keywords: Chloroplast nucleoid number ; Chloroplast DNA amount ; Preferential digestion ; Maternal inheritance ; Chlamydomonas reinhardtii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We studied the maternal chloroplast inheritance ofChlamydomonas reinhardtii by epifluorescence microscopy after staining with DNA specific fluorochrome DAPI and by genetic methods, using wild type cells and cells containing previously isolated mutation of cond-1 and cond-2. Wild type cells contained about 7 chloroplast (cp) nucleoids, while mutants, cond-1(+) and cond-2(+), contained about 14 and 23 cp nucleoids, respectively, after one week culture on agar plates. The total cpDNA contents were almost proportional to the numbers of cp nucleoids. When cells containing cond-1 or cond-2 mutation were used as a parental source to cross with wild type cells of the other parent, preferential digestion of cp nucleoids from male parent (mt−) origin occurred in the zygotes, although the frequencies of the digestion were slightly lower than that in the zygotes from the cross between wild type cells. Western blot analysis of the protein ofzyslB gene, which has been found related to preferential digestion of mt− origin cp-nucleoids DNA, showed that a high amount of this protein was detected with the initiation of preferential digestion of mt− cp nucleoids and disappeared with the completion of the digestion. Cp genetic markers for antibiotic resistance were maternally inherited in all crosses. These results showed that although the preferential digestion of cp nucleoids consisting of large number and large cpDNA amount requires a slightly longer period to complete, this high ploidy of the cp nucleoids does not disturb maternal inheritance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273163
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Mutations disturbing the condensation of plastid nucleoids inChlamydomonas reinhardtii (1994)
    Springer
    Protoplasma 178 (1994), S. 111-118 
    Details
    ISSN: 1615-6102
    Keywords: Aging ; Chlamydomonas ; Plastid nucleoid condensation ; Mutant ; Plastid nucleoids ; O2 evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To study the mechanism of condensation of dispersed plastid (pt) nucleoids into a single pt nucleoid with aging of the cells ofChlamydomonas reinhardtii, two mutants, designated cond-1 and cond-2, were isolated. A plastid of a wild type cell, 6.5 μm in diameter, contained ten dispersed spherical pt nucleoids within one week of culture on an agar plate. At about one week of culture, the cell number was saturated and pt nucleoids began to associate with each other, condensing into a single pt nucleoid at three weeks of culture. In contrast, cond-1 and cond-2 cells, which had about 20 and 45 pt nucleoids and whose cell diameters were 7.8 and 9.5 μm at one week of culture respectively, still had about 10 and 20 pt nucleoids at even 7 weeks of culture. Doubling times of the three cell types were similar. From genetic analysis, each of the two mutants had one gene mutation. The two mutations are probably linked. The measurement of O2 evolution showed that the two mutations did not affect the photosynthetic system. Lipid contents of the two mutant cells were clearly higher than that of wild type cells. The role of a higher number of pt nucleoids is probably to increase the activity of lipid and/or membrane synthesis for lipid storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01545961
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Synthesis of copolyester having quaternary ammonium groups in the main chain (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2517-2519 
    Details
    ISSN: 0887-624X
    Keywords: functional polyester ; liquid/solid biphase polycondensation ; tertiary amine group ; heterogeneous polymer reaction ; quaternary ammonium group ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 8
    Electronic Resource
    Electronic Resource
    Chemoselective polycondensation of isophthaloyl chloride with multifunctional monomers containing hydroxyl groups and sulfamino acid or amino acid moiety (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 493-495 
    Details
    ISSN: 0887-624X
    Keywords: chemoselective polycondensation ; functional polymer ; aromatic polyester ; hydroxyl group ; sulfamino acid moiety ; amino acid moiety ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No abstract.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 9
    Electronic Resource
    Electronic Resource
    Factors affecting dynamic durability of polycarbonate under bending, torsional, and impacting fatigue and in cavitation erosion and dynamic solvent cracking conditions (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 79-92 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: To understand influences of various factors on dynamic durability of engineering plastics, effects of average molecular weights of samples, molding variables, preparing methods of specimens, and fillers on plane and rotational bending, torsional, and impacting fatigue and cavitation erosion and solvent cracking of polycarbonate were studied. From the experimental results, the following tendencies are observed as a whole in case of polycarbonate: The extent of influence of the factors on dynamic durability varies depending on the type of testing. Increase in molecular weight has a favorable effect on dynamic durabilities. Influence of molding conditions is remarkable: especially, deficient drying of resin pellets before molding decreases dynamic durability noticeably, and specimens prepared by injection molding have much better durabilities than those by machaning from extruded sheet. Polyethylene blending has an unfavorable effect on durability, except for Izod-type impact strength and solvent cracking. Reinforcement by glass fiber has a favorable effect on fatigue under constant deformation and cavitation erosion.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...