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  • Springer  (43)
  • De Gruyter  (1)
  • American Chemical Society (ACS)
  • 1995-1999  (44)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    OnL p spectral multipliers for a solvable lie group (1996)
    Springer
    Geometric and functional analysis 6 (1996), S. 860-876 
    Details
    ISSN: 1420-8970
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02246787
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  • 2
    Electronic Resource
    Electronic Resource
    Embryonic angiogenesis: A review (1996)
    Springer
    Naturwissenschaften 83 (1996), S. 153-164 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143056
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  • 3
    Electronic Resource
    Electronic Resource
    Embryonic Angiogenesis: A Review (1996)
    Springer
    Naturwissenschaften 83 (1996), S. 153-164 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01143056
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  • 4
    Electronic Resource
    Electronic Resource
    Tissue specific loss of proliferative capacity of parthenogenetic cells in fetal mouse chimeras (1995)
    Springer
    Development genes and evolution 204 (1995), S. 436-443 
    Details
    ISSN: 1432-041X
    Keywords: Parthenogenesis ; Mouse chimeras ; Proliferation ; Differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Parthenogenetic cells are lost from fetal chimeras. This may be due to decreased proliferative potential. To address this question, we have made use of combined cell lineage and cell proliferation analysis. Thus, the incorporation of bromodeoxyuridine in S-phase was determined for both parthenogenetic and normal cells in several tissues of fetal day 13 and 17 chimeras. A pronounced reduction of bromodesoxyuridine incorporation by parthenogenetic cells at both developmental stages was only observed in cartilage. In brain, skeletal muscle, heart and intestinal epithelium, this reduction was either less pronounced or observed only at one of the developmental stages analysed. No difference between parthenogenetic and normal cells was observed in epidermis and ganglia. Our results show that a loss of proliferative potential of parthenogenetic cells during fetal development contributes to their rapid elimination in some tissues. The analysis of the fate of parthenogenetic cells in skeletal muscle and cartilage development demonstrated different selection mechanisms in these tissues. In skeletal muscle, parthenogenetic cells were largely excluded from the myogenic lineage proper by early post-midgestation. In primary hyaline cartilage, parthenogenetic cells persisted into adulthood but were lost from cartilages that undergo ossification during late fetal development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00360851
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution of androgenetic cells in fetal mouse chimeras (1995)
    Springer
    Development genes and evolution 204 (1995), S. 484-493 
    Details
    ISSN: 1432-041X
    Keywords: Imprinting ; Androgenesis ; Mouse chimeras
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To asses the potential of androgenetic cells to participate in post-midgestation fetal development we have made use of an in situ detectable cell lineage marker in the analysis of chimeric mouse fetuses containing an androgenetic cell lineage. Our results show conclusively that androgenetic cells participate in the formation of derivatives of all lineages and in some tissues may contribute the majority of the total cell population. However, the allocation or persistence of androgenetic cells was non-random. High contribution of androgenetic cells was observed in brown adipose tissue, mesenchyme, smooth muscle, perichondrium, peripheral nerves and epithelia of the intestinal tract and the trachea. Thus, androgenetic cells were able to efficiently populate mesodermal, ectodermal and endodermal derivatives. In contrast, there was a clear prejudice against androgenetic cells in the brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00360856
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  • 6
    Electronic Resource
    Electronic Resource
    Mesoderm-derived cells proliferate in the embryonic central nervous system: confocal microscopy and three-dimensional visualization (1997)
    Springer
    Histochemistry and cell biology 107 (1997), S. 205-213 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  In the chick and quail embryo, two cell populations migrate into the neural tube from the surrounding mesodermal tissues during the fourth day of incubation: individual cells which represent macrophages, and endothelial cells which remain continuous with the extraneural vessels. We report here on the proliferative capacity of these mesoderm-derived cells. A double-immunofluorescence protocol for two monoclonal antibodies of subtype IgG1, the endothelial cell/macrophage marker QH1, and the S-phase marker bromodeoxyuridine, was developed. With confocal laser scanning microscopy of thick microtome sections, labeling indices of intraneural individual QH1-positive cells (12%) and of endothelial cells (10%) were determined. In contrast, the labeling index of extraneural endothelial cells was 25%. With three-dimensional visualization of confocal data, the variable morphology of macrophages was shown. Our results indicate that: (1) proliferative activity of intraneural capillary endothelial cells is less than expected and that it is absent from sprouts; (2) both spheroidal and ramified macrophages proliferate inside the neural tissues; and (3) ramified macrophages frequently make contact with capillary endothelial cells. We conclude that most embryonic microglia may be derived from the early invasive QH1+ macrophages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004180050105
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  • 7
    Electronic Resource
    Electronic Resource
    Platelet-derived growth factor-B induces transformation of fibrocytes into spindle-shaped myofibroblasts in vivo (1998)
    Springer
    Histochemistry and cell biology 109 (1998), S. 349-357 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract  Platelet-derived growth factor (PDGF) has a targeted activity on mesenchymal cells, but the in vivo effects of PDGF are not well understood. We have applied about 3 μg of PDGF-A and PDGF-B on the differentiated chorioallantoic membrane (CAM) of 13-day-old chick embryos. After 1–3 days, specimens were evaluated macroscopically, histologically with semi- and ultrathin sections, and immunohistologically with antibodies against smooth muscle α-actin (αSMA), desmin, and fibronectin (FN). Proliferation studies were performed according to the 5-bromo-2-deoxyuridine (BrdU)/anti-BrdU method. We did not observe effects of PDGF-A. PDGF-B induced proliferation of fibrocytes and their transformation into myofibroblasts. Bundles of spindle-shaped myofibroblasts accumulated beneath the chorionic epithelium. These cells were strongly positive for αSMA and FN, but negative for desmin. They possessed a well developed rough endoplasmic reticulum and bundles of microfilaments anchoring in the cell membrane. Our results suggest that PDGF-B is a ”transforming” growth factor with important functions during formation of granulation tissue which are closely comparable to the effects of the PDGF-B-like protein of simian sarcoma virus. PDGF-B also induced vascular alterations in the CAM, which, however, appeared to be a secondary effect. While the intra-chorionic capillaries were lost, an accumulation of small vessels positive for αSMA was observed. This indicates a function for PDGF-B during segregation of main vessels from a primary vascular plexus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004180050235
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  • 8
    Electronic Resource
    Electronic Resource
    Phenylpropanoids in mycorrhizas of the Pinaceae (1999)
    Springer
    Planta 208 (1999), S. 491-502 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Conifers (Abies ; Picea ; Pinus ; Pseudotsuga) ; Ectomycorrhiza ; Phenylpropanoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Tissue-specific accumulation of phenylpropanoids was studied in mycorrhizas of the conifers, silver fir (Abies alba Mill.), Norway spruce [Picea abies (L.) Karst.], white pine (Pinus strobus L.), Scots pine (Pinus silvestris L.), and Douglas fir [Pseudotsuga menziesii (Mirbel) Franco], using high-performance liquid chromatography and histochemical methods. The compounds identified were soluble flavanols (catechin and epicatechin), proanthocyanidins (mainly dimeric catechins and/or epicatechins), stilbene glucosides (astringin and isorhapontin), one dihydroflavonol glucoside (taxifolin 3′-O-glucopyranoside), and a hydroxycinnamate derivative (unknown ferulate conjugate). In addition, a cell wall-bound hydroxycinnamate (ferulate) and a hydroxybenzaldehyde (vanillin) were analysed. Colonisation of the root by the fungal symbiont correlated with the distribution pattern of the above phenylpropanoids in mycorrhizas suggesting that these compounds play an essential role in restricting fungal growth. The levels of flavanols and cell wall-bound ferulate within the cortex were high in the apical part and decreased to the proximal side of the mycorrhizas. In both Douglas fir and silver fir, which allowed separation of inner and outer parts of the cortical tissues, a characteristic transversal distribution of these compounds was found: high levels in the inner non-colonised part of the cortex and low levels in the outer part where the Hartig net is formed. Restriction of fungal growth to the outer cortex may also be achieved by characteristic cell wall thickening of the inner cortex which exhibited flavanolic wall infusions in Douglas fir mycorrhizas. Long and short roots of conifers from natural stands showed similar distribution patterns of phenylpropanoids and cell wall thickening compared to the respective mycorrhizas. These results are discussed with respect to co-evolutionary adaptation of both symbiotic partners regarding root structure (anatomy) and root chemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050586
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  • 9
    Electronic Resource
    Electronic Resource
    Internal Nitridation of Nickel-Base Alloys. Part I. Behavior of Binary and Ternary Alloys of the Ni-Cr-Al-Ti System (1999)
    Springer
    Oxidation of metals 52 (1999), S. 277-298 
    Details
    ISSN: 1573-4889
    Keywords: INTERNAL NITRIDATION ; NITROGEN DIFFUSION ; NITROGEN SOLUBILITY ; π-PHASE ; THERMODYNAMIC EQUILIBRIUM CALCULATIONS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The internal-nitriding behavior of several modelalloys of the Ni-Cr-Al-Ti system in an oxygen-freenitrogen atmosphere at 800-1100°C was studied.Thermogravimetry as well as various metallographic techniques (SEM and TEM) were used. It wasshown that both the nitrogen solubility and the nitrogendiffusion coefficient are strongly affected by the Crcontent of the Ni alloy. Hence, in Ni-Cr-Ti alloys a higher chromium content leads to an increaseddepth of the internal precipitation of TiN. Nitridationof the alloying element Cr takes place only at highconcentrations of Cr. In general, the nitridation rate was found to obey Wagner's parabolic ratelaw of internal oxidation. Changes in the parabolic rateconstant with alloy composition can be understood bymeans of thermodynamic calculations in combination with microstructural observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018843612011
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  • 10
    Electronic Resource
    Electronic Resource
    Internal Nitridation of Nickel-Base Alloys. Part II. Behavior of Quaternary Ni-Cr-Al-Ti Alloys and Computer-Based Description (1999)
    Springer
    Oxidation of metals 52 (1999), S. 299-320 
    Details
    ISSN: 1573-4889
    Keywords: INTERNAL NITRIDATION ; NITROGEN DIFFUSION ; NITROGEN SOLUBILITY ; FINITE-DIFFERENCE TECHNIQUE ; THERMODYNAMIC EQUILIBRIUM CALCULATIONS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Whereas in Part I of this study the process ofinternal nitridation was described for binary andternary alloys within the Ni-Cr-Al-Ti system, this partfocuses on quaternary Ni-Cr-Al-Ti alloys, which are similar to commercial Ni-base alloys used inhigh-temperature applications regarding their chemicalcompositions. These alloys can simultaneously form twodifferent nitride-precipitation zones consisting of TiN and AlN. In order to quantify thenitridation process, thermogravimetric measurements inan oxygen-free nitrogen atmosphere in the temperaturerange 800-1100°C were carried out and supplemented by extensive microstructural studies. Whilesingle-nitride internal nitridation can easily bedescribed by Wagner's theory of internal oxidation,modeling of the more complex internal-precipitationreactions that involves more than one nitride requires anumerical treatment of both the diffusion and thethermochemical processes in the alloy. For this purpose,a computer simulation was developed in which the commercial thermodynamic software ChemApp iscombined with a finite-difference diffusion calculation.It was shown that this calculation technique can beapplied successfully to quantitatively describe the internal-nitridation process of theNi-Cr-Al-Ti model alloys used in this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018895628849
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