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  • 11
    Digitale Medien
    Digitale Medien
    Shoot regeneration from leaves of Prunus serotina Ehrh. (black cherry) and P. avium L. (wild cherry) (1998)
    Springer
    Plant cell reports 17 (1998), S. 526-530 
    Details
    ISSN: 1432-203X
    Schlagwort(e): Key words Thidiazuron ; Tissue culture ; Adventitious shoot ; Cytokinin ; Tree
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Leaves excised from shoot cultures of Prunus avium cvs. F12/1 and Charger and genotype 1908, and from five genotypes of P. serotina and two hybrids of P. avium×P. sargentii developed shoots on Woody Plant medium (WPM) supplemented with either benzyladenine (BA) or thidiazuron (TDZ). Regeneration in both P. avium 1908 and a genotype of P. serotina was improved using TDZ rather than BA in the medium. Regeneration occurred more frequently in P. serotina if leaves were cultured on medium with WPM rather than modified Driver and Kuniyuki walnut medium. The proportions of leaves that regenerated varied between genotypes of the same species. Regenerated shoots of both P. avium and P. serotina developed into shoot cultures following transfer to the media used to produce the shoot cultures used as explant sources.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002990050436
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  • 12
    Digitale Medien
    Digitale Medien
    Pressure build-up at the metal delivery tube orifice in ultrasonic gas atomization (1988)
    Springer
    Journal of materials science 23 (1988), S. 2457-2463 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The effects of geometry (diameter and tip design) and position (relative to the gas nozzles) of the metal delivery tube in an ultrasonic gas atomization (USGA) device on the pressure condition in the gas-metal interaction zone at the tube orifice have been studied. Simulation of ultrasonic gas (argon or nitrogen) atomization has been conducted, both at low (3.5 to 14 atm) and high (15 to 75 atm) atomization pressures. Low gas atomization pressures are generally used in spray deposition processes such as liquid dynamic compaction (LDC), while high pressures are used for powder production. Depending on the experimental conditions, i.e. the shape and angle of the taper at the metal delivery tube orifice or its position with respect to the nozzles' gas exit common plane, either partial vacuum (equivalent to downward aspiration of the melt) or overpressures (equivalent to back-pressurization of the melt) at the metal delivery tube was detected. Underpressure and overpressure effects were found to increase with gas atomization pressure. The maximum pressure differences measured with respect to the atomization chamber pressure were about 0.15 to 0.25 atm for the low-pressure experiments, and 0.50 to 0.60 atm for the high-pressure experiments. Underpressures or overpressures of these magnitudes have a large effect on the metal flow rate during gas atomization, either enhancing or reducing it, and thus changing significantly the gas to metal flow ratio. Because this is a crucial parameter for both the USGA and the LDC processes, the state of pressure at the delivery tube's orifice has to be monitored carefully, in order to ensure optimal processing conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01111903
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  • 13
    Digitale Medien
    Digitale Medien
    Crystallization of amorphous Ni60Nb40 (1983)
    Springer
    Journal of materials science 18 (1983), S. 804-814 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The crystallization of Ni60Nb40 metallic glass during continuous heating and isothermal annealing at temperatures from 845 to 904 K, was studied by differential scanning calorimetry (DSC), electrical resistance measurements, X-ray diffraction and transmission electron microscopy. Crystallization occurred in four clearly defined stages. In the initial stage a metastable phase, with structure similar to the M-phase in the Ni-Nb-Al ternary system, forms in the amorphous matrix. In the two subsequent stages the remaining glass crystallizes to the Ni3Nb- andΜ-phases found in the equilibrium Ni-Nb phase diagram. The M-phase transforms into the equilibrium Ni3Nb- andΜ-phases only at high temperature. The crystallization of the M-phase could be described by Johnson-Mehl-Avrami kinetics with the time exponentn=1.3 and activation energyE 1=628 kJ mol−1. M-phase crystal growth was apparently diffusion controlled and the diffusion coefficient was estimated to be 4.2×10−20 m2 sec−1. Activation energies for the second and third stages of crystallization were found to beE 2=446 kJ mol−1 andE 3 = 430 kJ mol−1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00745579
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  • 14
    Digitale Medien
    Digitale Medien
    Molecular markers of sympathoadrenal cells (1999)
    Springer
    Cell & tissue research 298 (1999), S. 185-206 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Key words Chromaffin cells ; Sympathoadrenal cells ; Migration ; Differentiation ; Protein expression ; Symapathetic ganglia ; Adrenal gland
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  Cells constituting the sympathoadrenal (SA) cell lineage originate from the neural crest and acquire a catecholaminergic fate following migration to the dorsal aorta. Subsequently, SA cells migrate to sites widely dispersed throughout the body. In addition to endocrine chromaffin and ”small intensely fluorescent” cells in adrenal glands and in extra-adrenal tissues such as the paraganglia, this lineage also includes neurones located in sympathetic ganglia and in the adrenal gland. It is widely assumed that these cells are all derived from the same precursors, which then differentiate along divergent pathways in response to different external stimuli. During embryonic differentiation, SA cells lose some of their early traits and acquire other distinguishing features. To help understand how the lineage diverges in terms of phenotype and function, this article examines the cellular expression of a variety of ”marker” proteins that characterize the individuals of the lineage. In particular, differences between adrenal medullary adrenergic and noradrenergic chromaffin cells in the expression of proteins, such as the neural adhesion molecule L1, the growth-associated protein GAP-43 and molecules involved in the secretory process, are emphasized. Factors that might differentially regulate such molecular markers in these cells are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00008810
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  • 15
    Digitale Medien
    Digitale Medien
    Micropropagation of mature British wild cherry (1997)
    Springer
    Plant cell, tissue and organ culture 47 (1997), S. 103-110 
    Details
    ISSN: 1573-5044
    Schlagwort(e): clone ; farm woodland ; forestry ; propagation ; Prunus avium L. ; regeneration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Shoot tips from accessions of wild cherry (Prunus avium L.) selected from British woodland, and also theP. avium rootstock cvs. F12/1 and Charger, were successfully establishedin vitro, and most were easily micropropagated on Murashige and Skoog (MS)-based media. In one accession, adventitious shoots occasionally developed from the extrafloral nectaries positioned at the base of leaf petioles of the initial explants. Micropropagation of cv. Charger was improved by culture on a Quoirin and Lepoivre and Woody Plant-based medium, and by supplementing the medium with 1-phenyl-3-(1, 2, 3-thiadiazol-5yl)urea (thidiazuron). Poor shoot production by F12/1 on 1, 3, 5-trihydroxybenzene (phloroglucinol)-free media was not improved by up to 18 months of regular subculture. Study of cv. F12/1 showed that shoots produced on a MS-based medium with 1 mM phloroglucinol, 0.49 μM indolebutyric acid, 4.4 μM benzyladenine (BA) and 0.29 μM gibberellic acid (GA3), were easier to root over several subcultures than shoots produced on a similar medium with no GA3 and only 2.2 μM BA, but only in a rooting medium supplemented with 1 mM phloroglucinol.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02318945
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  • 16
    Digitale Medien
    Digitale Medien
    Cooling-rates in splat-cooling (1972)
    Springer
    Journal of materials science 7 (1972), S. 1343-1344 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00550702
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  • 17
    Digitale Medien
    Digitale Medien
    Identification of thin epitaxial films of Cu2O on TEM specimens of a Cu-Ni-Ti alloy (1983)
    Springer
    Journal of materials science 2 (1983), S. 15-16 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00719944
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  • 18
    Digitale Medien
    Digitale Medien
    A scanning electron microscopic study of larval development in the marine polychaete, Galeolaria caespitosa Lamarck (Serpulidae) (1981)
    Springer
    Cell & tissue research 215 (1981), S. 171-179 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Polychaeta, Serpulidae ; Gamete ; Larva ; Development ; Scanning electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Gametes and developing larvae of the polychaete Galeolaria caespitosa were examined by scanning electron microscopy. The sperm display a primitive morphology. When treated with 0.33 M CaCl2, they release a branched acrosomal process. At spawning, the polygonal oocytes have a granular surface made up of spherules and the tips of microvilli. The oocyte coat develops a ridged appearance as the oocyte rounds up. At fertilization, the microvilli are withdrawn from the coat surface. Microvilli again appear on the coat surface during the trochophore stage, but the egg coat appears to be retained as the larval cuticle until the demersal stage. The surface of the larva now shows many microvilli. Details of the organization of several ciliary structures are clarified. Moreover, the present study shows rapid, sequential development of paired setal sacs, with the most anterior pair appearing first.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00236257
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