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  • 1995-1999  (2)
  • 1990-1994  (4)
  • 1965-1969  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Shock and release wave properties of yttria-doped tetragonal and cubic zirconia (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 4868-4874 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Velocity interferometry diagnostics are used to monitor transmitted compressive shock and release waves in yttria (Y2O3)-stabilized tetragonal and cubic zirconia. In tetragonal zirconia compressive yielding due to lattice slip or lattice instability is observed at 13–17 GPa and again at 30–31 GPa. This represents an additional fine structure to the dynamic compression of zirconia that has not previously been observed. A correlation with initial sample density is seen for the lower-amplitude yield. A single yield over the range of the data occurs at 5–6 GPa for cubic zirconia. Approximately 4%–6% porosity in the cubic zirconia accounts for initial yield somewhat lower than earlier studies. From unloading wave profile measurements, initial release wave velocities at the Hugoniot state and stress derivatives of these data are determined. Release moduli data increase monotonically over a Hugoniot stress range of 11–45 GPa. A stress derivative of this data of K'l = 1.85 is obtained. Stress derivatives determined directly from the initial release slope of individual profiles are significantly higher and suggest deformation or phase transformation kinetics on release. Release waves from Hugoniot states of 11–13 GPa suggest formation of a rarefaction shock and may imply a dynamic stress-induced transformation not indicated by the shock profile. A tensile spall strength of 1.6 GPa was determined for the tetragonal zirconia. This high value may be related to the large fracture toughness of this transformation-toughened ceramic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350631
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  • 2
    Digitale Medien
    Digitale Medien
    ANALYSIS IN SPONTANEOUSLY HYPERTENSIVE RATS (1999)
    Melbourne, Australia : Blackwell Science Asia Pty. Ltd.
    Clinical and experimental pharmacology and physiology 26 (1999), S. 0 
    Details
    ISSN: 1440-1681
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: 1. Linkage analysis is performed between basal or salt- sensitive high blood pressure and several loci on chromosomes in F2 progenies obtained from crossing stroke-prone spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto rats.2. Basal hypertensive genes are mapped to a region near the D1Mit2 locus on chromosome 1 and near the D3Mgh8 locus on chromosome 3 in the male and female F2 progenies.3. Salt-sensitive hypertensive gene is mapped to a region near RR1023 locus on chromosome 10 in the male F2 progenies.4. Salt-sensitive hypertensive gene is mapped to a region near D3Mgh12 locus on chromosome 3 in the female F2 progenies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1440-1681.1999.03089.x
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  • 3
    Digitale Medien
    Digitale Medien
    Carcinogenesis in accessory sex organs of rats induced by 3,2′-dimethyl-4-aminobiphenyl: response to androgen deprivation (1997)
    Springer
    Histochemistry and cell biology 108 (1997), S. 505-512 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract  It is generally accepted that early human prostate cancers reveal higher androgen dependency than do advanced ones. In the present study, we examined whether the animal model of prostate cancer has already lost androgen dependency at the early stages of carcinogenesis. At experimental week 46, androgen deprivation was induced in rats and the incidences of atypical hyperplasia and cancer were examined in the ventral, dorsolateral prostate, coagulating glands, and seminal vesicles. Androgen deprivation significantly lowered the incidence of atypical hyperplasia in all four organs. As for the incidence of cancer, no significant differences were observed in the coagulating glands and seminal vesicles. Regarding atypical hyperplasia, androgen deprivation significantly decreased the proliferative cell nuclear antigen labeling index in the coagulating gland and seminal vesicles. The presence of cancer was also decreased in the coagulating gland but not in the seminal vesicles. With control group specimens, more intense staining of androgen receptor was observed in atypical hyperplasias than in cancers. Compared with the atypical hyperplasias, the cancers revealed low androgen dependency at the early stages of carcinogenesis. The cancers in the seminal vesicles also revealed higher androgen independency than did those in the coagulating gland.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004180050191
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  • 4
    Digitale Medien
    Digitale Medien
    Synthesis of the B1-type tantalum nitride by shock compression (1993)
    Springer
    Journal of materials science 28 (1993), S. 3439-3443 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract B1-type tantalum nitride (polycrystalline bulk state) was synthesized by shock compression. Shock-compression recovery experiments of the porous sample of tantalum nitride with a hexagonal structure (CoSn-type) were performed in the impact-velocity range up to 1.5kms−1. The instrumental chemical analysis, X-ray and electron diffraction experiments were carried out on the recovered tantalum nitride sample and the combustion-synthesized B1-type sample for comparison. The recovery rate of the B1 -type phase increased with increasing porosity, impact velocity and impactor thickness; among these above all the effect of porosity was most remarkable. Almost 100% recovery rate was achieved for the powder of 70% porosity impacted by a 2 mm thick tungsten plate with velocities above 1.4 kms−1. It was confirmed by chemical analysis that the nitrogen content did not change by shock compression. The chemical formulae of the shock-synthesized and combustioned-synthesized B1-type phases were estimated to be TaN0.96–0.99 and TaN1.13–1.16, 1.27–1.30, respectively. The lattice parameter of the shock-synthesized B1 -type (Fm3m) phase was ao=0.43363- + (1) nm. The results of X-ray and electron diffraction experiments also supported that the shock-synthesized B1-type tantalum nitride has a good stoichiometry compared with the combustion-synthesized ones.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01159819
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  • 5
    Digitale Medien
    Digitale Medien
    Synthesis of the WC-type tantalum nitride by mechanical alloying (1994)
    Springer
    Journal of materials science 13 (1994), S. 174-176 
    Details
    ISSN: 1573-4811
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00278152
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  • 6
    Digitale Medien
    Digitale Medien
    A new biodegradable polydepsipeptide microsphere for application in drug delivery systems (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 726-730 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Sequentialpolydepsipeptide ; polymericmicrosphere ; poly(L-alanyl-L-alanyl-γ-ethyl L-glutamyl-L-lactyl) ; solventevaporationprocess ; drugdeliverysystem ; malerat ; ratprostate ; 17Β estradiol
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract A sequential polydepsipeptide containing a tripeptide sequence L-alanyl-Lalanylγ-ethyl L-glutamyl and anα-hydroxy acid L-lactic acid, poly(Ala-Ala-Glu(OEt)-Lac), was synthesized to prepare the microspherical particles by the solvent evaporation process. In this case, the solvents play the most important role for the preparation of polydepsipeptide microspheres and, as an example, when 200 mg of the polydepsipeptide dissolved in 10 ml of 98/2% chloroform/dichloroacetic acid mixture was stirred at 400 rpm and 30
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01411103
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  • 7
    Digitale Medien
    Digitale Medien
    Elektronenmikroskopische Untersuchungen an der Epiphysis cerebri beim Hund (1966)
    Springer
    Cell & tissue research 69 (1966), S. 129-139 
    Details
    ISSN: 1432-0878
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung 1. Die Epiphysis cerebri von 30 Hunden wurde elektronenmikroskopisch im Hinblick auf ihre sekretorische Funktion untersucht. 2. Die Pinealzellen sind sekretorisch tätige Zellen. Das Sekret wird in Form von „synaptischen“ Bläschen im Bereich des Golgi-Apparates produziert. Außer den Bläschen wurden osmiophile Granula (Pigmentgranula und Fetttröpfchen) verschiedener Menge beobachtet. 3. Die Pinealzellen sind multipolare Zellen mit Fortsätzen von verschiedener Länge und Dicke. Sie enden mit keulenförmigen Anschwellungen in den perivaskulären Spalten. 4. Die im Fortsatz enthaltenen Bläschen (Durchmesser 350–1400 Å) besitzen in der Regel ein elektronendichtes Granulum. Sie werden wahrscheinlich durch die Basalmembran in das Kapillarlumen abgegeben. Damit stellt sich der Sekretionsmodus der Zirbeldrüse als ähnlich heraus mit dem bei der Neurosekretion oder bei Abgabe von neurohumoralen Transmitters in der Nervenendigung.
    Notizen: Summary The epiphysis of 30 dogs was studied electronmicroscopically. The pineal cells are secretory elements; their product arises from small vesicles in the Golgi apparatus. In addition to such vesicles, osmiophilic granules (pigments and lipids) were observed in varying amounts. The pineal cells are multipolar with processes of diverse length and thickness. These end with bulbous swellings in perivascular clefts. The vesicles found in the processes (diameters 350–1,400 Å) as a rule contain an electron dense granule. They are probably released into the capillary lumen via the basement membrane. Thus the secretory process in the pineal seems to resemble that in neurosecretory centers or that of the site of production of neurohumoral transmitters at nerve endings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00406271
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