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  • 1995-1999  (4)
  • Corpus cardiacum  (2)
  • Bacillus subtilis  (1)
  • Energy absorption  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Metal foaming by a powder metallurgy method: Production, properties and applications (1998)
    Springer
    Materials research innovations 2 (1998), S. 181-188 
    Details
    ISSN: 1433-075X
    Keywords: Key words Cellular materials ; Metal foams ; Powder metallurgy ; Near-net-shaped foaming ; Light weight construction ; Energy absorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  A method for fabricating metal foams based on the powder metallurgy process is presented. This foaming process allows for the production of complex-shaped foam parts, metal foam sandwich panels and foam filled hollow profiles. A range of alloys can be foamed using this method including aluminum, zinc, tin, lead and steel. The as-produced part has a closed-cell microstructure and a high fraction of porosity (typical range from 40–90% porosity). Selected mechanical properties of metal foams are evaluated, including the loading of foam samples with and without face skins and the axial crushing of tubular structures with foam reinforcement. Potential applications are discussed such as light-weight construction and energy absorption for both military and civilian uses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100190050082
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Purification and properties of ap-nitrobenzyl esterase fromBacillus subtilis (1995)
    Springer
    Journal of industrial microbiology and biotechnology 15 (1995), S. 10-18 
    Details
    ISSN: 1476-5535
    Keywords: p-nitrobenzyl carboxy esterase ; biocatalyst ; beta-lactam antibioticp-nitrobenzyl ester ; Bacillus subtilis ; deesterification ; carboxyl protection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A procedure for purifying to homogeneity a microbially produced biocatalyst useful for deblocking intermediates in the manufacture of beta-lactam antibiotics is reported. In aqueous solution the purifiedp-nitrobenzyl (PNB) carboxy-esterase was soluble, monomeric (molecular weight: 54 000 by SDS-PAGE or by gel filtration) and exhibited an acidic pl, 4.1. The PNB carboxy-esterase catalyzed rapid ester hydrolysis for simple organic esters such as PNB-acetate, benzyl acetate and α-naphthyl acetate and catalyzed deblocking (ester hydrolysis) of beta-lactam antibiotic PNB esters such as cephalexin-PNB and loracarbef-PNB. TheN-terminal amino acid sequence and the amino acid composition are reported. A serine residue is involved in ester hydrolysis: the PNB carboxy esterase was inhibited by phenylmethylsulfonyl fluoride and diethylp-nitrophenyl phosphate; one mole of diisopropyl fluorophosphate titration was required per mole of PNB carboxy-esterase for complete inhibition. When the [3H]-diisopropyl fluorophosphate-treated biocatalyst was digested with Lys C and the resulting peptides separated by HPLC, a single [3H]-labeled peptide was obtained; its amino acid sequence is reported. Inhibition of the PNB carboxy esterase by diethyl pyrocarbonate suggests that a histidinyl residue (or residues) is (are) also involved in the catalytic site of the esterase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570007
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Immunological evidence for an allatostatin-like neuropeptide in the central nervous system of Schistocerca gregaria, Locusta migratoria and Neobellieria bullata (1995)
    Springer
    Cell & tissue research 279 (1995), S. 601-611 
    Details
    ISSN: 1432-0878
    Keywords: Allatostatin ; Juvenile hormone ; Insect brain ; Neuropeptide ; Corpus allatum ; Corpus cardiacum ; Neurosecretory cells ; Schistocerca gregaria ; Locusta migratoria ; Neobellieria bullata (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Methanolic brain extracts of Locusta migratoria inhibit in vitro juvenile hormone biosynthesis in both the locust L. migratoria and the cockroach Diploptera punctata. A polyclonal antibody against allatostatin-5 (AST-5) (dipstatin-2) of this cockroach was used to immunolocalize allatostatin-5-like peptides in the central nervous system of the locusts Schistocerca gregaria and L. migratoria and of the fleshfly Neobellieria bullata. In both locust species, immunoreactivity was found in many cells and axons of the brain-retrocerebral complex, the thoracic and the abdominal ganglia. Strongly immunoreactive cells were stained in the pars lateralis of the brain with axons (NCC II and NCA I) extending to and arborizing in the corpus cardiacum and the corpora allata. Although many neurosecretory cells of the pars intercerebralis project into the corpus cardiacum, only 12 of them were immunoreactive and the nervi corporis cardiaci I (NCC I) and fibers in the nervi corporis allati II (NCA II) connecting the corpora allata to the suboesophageal ganglion remained unstained. S. gregaria and L. migratoria seem to have an allatostatin-like neuropeptide present in axons of the NCC II and the NCA I leading to the corpus cardiacum and the corpora allata. All these data suggest that in locusts allatostatin-like neuropeptides might be involved in controlling the production of juvenile hormone by the corpora allata and, perhaps, some aspects of the functioning of the corpus cardiacum as well. However, when tested in a L. migratoria in-vitro juvenile hormone-biosynthesis assay, allatostatin-5 did not yield an inhibitory or stimulatory effect. There is abundant AST-5 immunoreactivity in cell bodies of the fleshfly N. bullata, but none in the CA-CC complexes. Apparently, factors that are immunologically related to AST-5 do occur in locusts and fleshflies but, the active protion of the peptide required to inhibit JH biosynthesis in locusts is probably different from that of AST-5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318172
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Immunological evidence for an allatostatin-like neuropeptide in the central nervous system of Schistocerca gregaria, Locusta migratoria and Neobellieria bullata (1995)
    Springer
    Cell & tissue research 279 (1995), S. 601-611 
    Details
    ISSN: 1432-0878
    Keywords: Key words: Allatostatin ; Juvenile hormone ; Insect brain ; Neuropeptide ; Corpus allatum ; Corpus cardiacum ; Neurosecretory cells ; Schistocerca gregaria ; Locusta migratoria ; Neobellieria bullata (Insecta)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. Methanolic brain extracts of Locusta migratoria inhibit in vitro juvenile hormone biosynthesis in both the locust L. migratoria and the cockroach Diplo-ptera punctata. A polyclonal antibody against allatostatin-5 (AST-5) (dipstatin-2) of this cockroach was used to immunolocalize allatostatin-5-like peptides in the central nervous system of the locusts Schistocerca gregaria and L. migratoria and of the fleshfly Neobellieria bullata. In both locust species, immunoreactivity was found in many cells and axons of the brain-retrocerebral complex, the thoracic and the abdominal ganglia. Strongly immunoreactive cells were stained in the pars lateralis of the brain with axons (NCC II and NCA I) extending to and arborizing in the corpus cardiacum and the corpora allata. Although many neurosecretory cells of the pars intercerebralis project into the corpus cardiacum, only 12 of them were immunoreactive and the nervi corporis cardiaci I (NCC I) and fibers in the nervi corporis allati II (NCA II) connecting the corpora allata to the suboesophageal ganglion remained unstained. S. gregaria and L. migratoria seem to have an allatostatin-like neuropeptide present in axons of the NCC II and the NCA I leading to the corpus cardiacum and the corpora allata. All these data suggest that in locusts allatostatin-like neuropeptides might be involved in controlling the production of juvenile hormone by the corpora allata and, perhaps, some aspects of the functioning of the corpus cardiacum as well. However, when tested in a L. migratoria in-vitro juvenile hormone-biosynthesis assay, allatostatin-5 did not yield an inhibitory or stimulatory effect. There is abundant AST-5 immunoreactivity in cell bodies of the fleshfly N. bullata, but none in the CA-CC complexes. Apparently, factors that are immunologically related to AST-5 do occur in locusts and fleshflies but, the active portion of the peptide required to inhibit JH biosynthesis in locusts is probably different from that of AST-5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004410050319
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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