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  • 1
    Electronic Resource
    Electronic Resource
    Stylet penetration by larvae of the greenhouse whitefly on cucumber (1996)
    Springer
    Entomologia experimentalis et applicata 79 (1996), S. 77-84 
    Details
    ISSN: 1570-7458
    Keywords: Trialeurodes vaporariorum ; Homoptera ; Aleyrodidae ; probing ; electrical penetration graph ; EPG ; honeydew excretion ; phloem ; feeding ; ingestion ; moulting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Probing behaviour of Trialeurodes vaporariorum (Westwood) larvae was monitored using the DC electrical penetration graph (EPG) technique on the host plant cucumber. EPGs were recorded for 16 h, simultaneously with honeydew excretion using a ‘honeydew clock’. Three waveforms were distinguished: a pathway waveform (C), and two phloem waveforms, one with a high (H), and one with a low frequency (L) signal. The C waveform mainly occurred in the crawler stage of the 1st instar larvae. EPGs recorded from larvae during and after moulting indicated that the process involves stylet withdrawal; hence the stylets of each new instar need to penetrate again from the leaf surface to the phloem. All sessile stages, from L1 to pre-pupa, spent almost their entire time in waveforms H and L. These waveforms alternated more frequently in the early instars than during the later ones, in which the H waveform became predominant. The H waveform was highly correlated with honeydew excretion and thus phloem sap ingestion. The L waveform was not related to honeydew excretion but EPGs indicated that the stylet tips remain in a sieve element during both waveforms. Periods of honeydew production demonstrated a delay of 30–40 min in relation to the onset and end of H and L waveforms. This delay is presumably related to the time needed for food passing through, or emptying of, the insect's gut. From the 1st instar to the pre-pupa, the frequency of excreted honeydew droplets decreased but their size increased, causing a net increase of the excretion rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333824
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis, characterization, and catalytic phenol hydroxylation of a novel complex oxide HxV2Zr2O9.H2O (1997)
    Springer
    Catalysis letters 49 (1997), S. 49-52 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A novel type of complex oxide HxV2Zr2O9.H 2O with V4+ and V5+ mixed valence has been hydrothermally synthesized in a V2O5-ZrO2-H2O system at 240°C for 5 days in presence of NaF. The catalytic data over these complex oxides show that these complex oxides are catalytically very active in phenol hydroxylation by 30% aqueous hydrogen peroxide, and their catalytic activity is dependent on crystal size of the catalysts. The phenol conversion over the catalyst with crystal size of 7 μm is twice that over the catalyst with crystal size of 35 μm. The V5+ species are suggested to be the catalytic active sites. Some other factors which influence the catalytic activity were also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019045003008
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  • 3
    Electronic Resource
    Electronic Resource
    Endemic fluorosis in China from ingestion of food immersed in hot spring water (1995)
    Springer
    Bulletin of environmental contamination and toxicology 54 (1995), S. 337-341 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195102
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  • 4
    Electronic Resource
    Electronic Resource
    Population differences in gonad and pyloric caeca cycles of the New Zealand seastarSclerasterias mollis (Echinodermata: Asteroidea) (1991)
    Springer
    Marine biology 108 (1991), S. 97-103 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Inshore and offshore populations ofSclerasterias mollis (Hutton, 1872) were sampled on the outer continental shelf off the Otago Peninsula, New Zealand, and their nutritional and reproductive cycles are described from 1985–1986. Histological changes in the gonads are generally typical of other asteroids. The gametogenic cycle takes 12 mo. The gonad and pyloric caeca indices in both females and males had an inverse relationship.S. mollis accumulates nutrients in the pyloric caeca during summer and early autumn. The gonads develop in the autumn and winter. Offshore seastars were much larger and had significantly higher gonad and pyloric caeca indices than inshore individuals. These differences in body sizes and organ indices arise from differences in food availability and/or population density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313476
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  • 5
    Electronic Resource
    Electronic Resource
    Seasonal changes in biochemical composition of body walls, gonads and pyloric caeca in two populations ofSclerasterias mollis (Echinodermata: Asteroidea) during the annual reproductive cycle (1991)
    Springer
    Marine biology 109 (1991), S. 27-34 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal changes in biochemical composition of tissues are compared in a shallow inshore and deeper offshore population of the seastarSclerasterias mollis (Hutton, 1872) on the Otago shelf, New Zealand, from 1985 to 1986. The biochemical composition of the body wall, gonads and pyloric caeca of the two populations did not differ greatly, even though reproductive output and nutrient storage of reserves were consistently higher in the offshore population. The biochemical composition of the ovaries and testes differed. High levels of carbohydrate and lipid were maintained in the ovaries from the commencement of vitellogenesis until spawning occurred. The testes had higher ash levels during spermatogenesis. During the annual reproductive cycle, an inverse relationship in the carbohydrate levels between the ovary and the pyloric caeca suggests nutrient transfer from the pyloric caeca to the gonads during gametogenesis. Annual changes in biochemical composition indicate that the body wall is also used for nutrient storage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320228
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  • 6
    Electronic Resource
    Electronic Resource
    Silicon nitride-stainless steel braze joining with an active filler metal (1994)
    Springer
    Journal of materials science 29 (1994), S. 6287-6294 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Hot-pressed Si3N4 was brazed to 410-stainless steel using a Ag-Cu-Ti alloy foil in a vacuum. The occurrence of cracking due to processing was examined by systematically varying the brazing temperature and time between 840 and 900 °C and 6 and 60 min, respectively. Cracks were found in Si3N4 parallel to the bonding interface when the braze joints were processed at the lower temperatures (for all processing times at 840 °C and for times of 6 and 12 min at 860 °C). A reaction layer was observed to develop in the filler metal adjacent to Si3N4, rich in Ti and containing some Si. The thickness of this layer depended on brazing temperature and time. Microcracks were found in the reaction layer normal to the bonding interface in the joints processed at higher brazing temperatures (880 °C for 60 min and at 900 °C for 30 and 60 min). The low temperature cracks occurred, apparently, as a result of the incomplete relaxation of thermal stresses due to the presence of a hard continuous titanium strip in the filler metal; the high temperature microcracks seemed to be affected by the increase in thickness of the reaction layer and by the precipitation of intermetallic compounds. The compressive shear strength of the braze joints were evaluated and correlated with the cracking behaviour and microstructure changes in the joint. A strong braze joint was obtained when the reaction layer was relatively thin and no cracks were present in either the reaction layer or the Si3N4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354573
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  • 7
    Electronic Resource
    Electronic Resource
    Particle dynamics and currents in the magnetotail (1988)
    Springer
    Astrophysics and space science 144 (1988), S. 257-277 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper is a brief summary of our studies of magnetotail phenomena, based on the motion of charged particles and on electric currents. Theory and satellite data have been used together to obtain quantitative understanding. A guiding center theory similar to that of the usual Alfvén's guiding center theory has been developed. In the region where the magnetic field is small or equal to zero, the circular motion becomes an ‘8’-shaped motion, and the magnetic moment is equivalent to two opposite magnetic moments. An analytical trajectory of the particle motion has been found in the neutral sheet magnetic field. In the more general case, in the neutral line magnetic field, a particle computer simulation has been used, studying the accelerations, the pitch angular scattering and the propagation of a point source plasma in the magnetotail. Some current descriptions in the magnetotail have been discussed. The plasma current sheet was found from the solution of a time-independent Vlasov equation, and the relation between the particle motion and the magnetic field is a selfconsistent system. We have derived an expression for a 3-dimensional function of a field-aligned current. Moreover, some simple model of the filamentary current found by the satellite data in the magnetotail lobe is discussed. Finally, we have analysed the particle and magnetic field data observed by IMP-7, IMP-8, and ISEE-1, and found the dawn-dusk asymmetry of the particles in the neutral sheet, the magnetic current sheet, and the filamentary current in the magnetotail lobe, which are comparable to the theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00793184
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  • 8
    Electronic Resource
    Electronic Resource
    Solidification microstructure of super-α2 alloy prepared by gas atomization (1997)
    Springer
    Journal of materials science 32 (1997), S. 3821-3827 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Ti–25Al–10Nb–3V–1Mo alloy has been prepared by gas atomization with atomizing pressure above 8 MPa. The cooling rate of 5×103∼3×105 K s-1 was obtained according to secondary dendritic arm spacing, as the particle size is 30∼300 μm. It is known that in the big particles two dendrite morphologies can be found, cellular dendrite and well-developed dendrite, and in small particles there exists only well-developed dendrite. The surface of particles is characteristic of solidification that is identical to the observation on the cross-sectional views. The micrographs of cross-sectional views show that the big particles, whether of cellular dendrite or well-developed dendrite, solidify by multiple nucleation events while the small particles of well-developed dendrite solidify from a single nucleation event. The microstructure of the alloy consists of single β0 phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018683909004
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  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer effect study of 316L stainless steel irradiated with 54 MeV12C6+ ions (1992)
    Springer
    Hyperfine interactions 70 (1992), S. 931-934 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using Mössbauer effect (ME) and X-ray diffraction method, phase transformation in 316L stainless steel samples irradiated with 54MeV12C6+ has been studied. Phase transformation and the distribution of carbon in the samples have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397480
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  • 10
    Electronic Resource
    Electronic Resource
    An immunological study on chromogranin A and B in human endocrine and nervous tissues (1989)
    Springer
    Journal of molecular histology 21 (1989), S. 365-372 
    Details
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Antisera were raised against synthetic peptides derived from the primary amino acid sequence of human chromogranin B. These antisera recognized in one- and two-dimensional immunoblotting a component previously designated as chromogranin B. In human chromaffin granules, the major endogenous processing product of chromogranin B is formed by proteolytic cleavage of the protein near theC-terminus. Immunohistochemical localizations were obtained with antisera against human chromogranins A and B and against a synthetic peptide corresponding to the B sequence. In human tissues, chromogranin B is co-stored with chromogranin A in the adrenal medulla, the anterior pituitary, parafollicular cells of the thyroid, in some cells of the endocrine pancreas and in some enterochromaffin cells, whereas only chromogranin A is found in the parathyroid gland and enterochromaffin cells of the gastric corpus mucosa. In the nervous system, no immunostaining was observed for chromogranin A and only a weak one for chromogranin B in some cells of the spinal cord. However, the Purkinje cells of the cerebellum were strongly positive for chromogranin B.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01798500
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