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  • 1985-1989  (10)
  • 1970-1974
  • 1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of stacking sequence on valence bands in Ga/As/Ge (001) monolayer superlattices (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1300-1302 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Valence bands of Ga/As/Ge (001) monolayer superlattices (MLSLs) are calculated by Harrison's tight-binding method. The MLSLs have two possible types of growth cycles: a (Ga,As,Ge,Ga,As,Ge) cycle for an antiphase type (AP type) and a (Ga,As,Ge,As,Ga,Ge) cycle for a normal phase type (NP type). Cations and anions in the AP type occupy "antisites'' of the zinc blende structure while those in the NP type occupy only "normal sites.'' The two types have distinct features of the valence bands concerning degeneracy of the bands at the zone boundary, splitting of the valence-band maximum due to the tetragonal symmetry, and valence-band discontinuity in a (bulk Ge)/(the MLSL) junction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101638
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spectral quantum efficiencies of semiconductor photodiodes in the far ultraviolet region : International conference on synchrotron radiation instrumentation (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2303-2306 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The spectral quantum efficiencies and reflectances of p-i-n-type Si photodiodes and a Schottky-type GaAsP photodiode were measured in the wavelength region between 105 to 300 nm. These results are compared with an optical model using complex refractive indices. The spectral relative external quantum efficiencies are well interpreted within the model by assuming that the production energy of an electron-hole pair, ε, is wavelength independent. It is suggested that surface recombination of minority carriers occurs in some devices. The internal quantum efficiency for the GaAsP photodiode is shown to be constant in the photon energy range below about 5.4 eV. The recombination loss and the ε value are separately estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140747
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stereoselective hydrogenation via dynamic kinetic resolution (1989)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 111 (1989), S. 9134-9135 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00207a038
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Periodontal disease prevalence in different age groups in Japan as assessed according to the CPITN (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Community dentistry and oral epidemiology 17 (1989), S. 0 
    Details
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract A CPITN survey was conducted involving 12832 Japanese subjects from 7 to 64 years of age. Subjects under 18 were schoolchildren, and 18-year-old and older subjects represented various social backgrounds, having been randomly selected from both urban and rural Japan. Fifty percent of the 7-yr-old children had signs of periodontal disease, and this percentage increased with increasing age. In those under 14, this increase in periodontal disease was mainly due to an increase in the proportion of children developing dental calculus. Subjects with 6 mm or deeper pockets were observed starting from the 20-29-yr-old age group. In subjects over this age, the prevalence of periodontal disease was higher in men than in women. The percentages of subjects having pathologic pockets had increased remarkably in the 30-44-yr-olds. In the 45–64-yr-old group, almost all subjects had some sign of periodontal disease, and the percentage of those with 4 or 5 mm pockets and 6 mm or deeper pockets were 37% and 21%, respectively
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0528.1989.tb00591.x
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  • 5
    Electronic Resource
    Electronic Resource
    Primary malignant lymphoma of the brain: demonstration of immunoglobulin gene rearrangements in four cases by the Southern blot hybridization technique (1989)
    Springer
    Acta neuropathologica 79 (1989), S. 23-26 
    Details
    ISSN: 1432-0533
    Keywords: Malignant lymphoma ; Brain tumor ; Non-Hodgkin lymphoma ; Immunoglobulin ; Gene rearrangement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using the Southern blot hybridization technique, four cases of the primary malignant lymphomas of the brain, histologically diffuse large cell lymphoma, were examined for the immunoglobulin gene rearrangements. In three lymphomas, the rearrangements were observed in both heavy and light chain genes, providing strong evidence for a B cell lineage of these tumors. On the other hand, in the remaining lymphoma, the rearrangement was observed only in the heavy chain gene. Despite this, immunohistochemical examination revealed positive stainings for heavy and light chain immunoglobulins in tumor cells, suggesting the occurrence of light chain gene rearrangement at the undetectable level. Thus, B lymphocytic differentiation at the gene level was demonstrated in three, or possibly all, of the primary intracerebral malignant lymphomas examined. Since no more than two rearrangements were detected in each immunoglobulin gene, these lymphomas were considered to be monoclonal in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308952
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  • 6
    Electronic Resource
    Electronic Resource
    An immunohistochemical analysis of T cells in primary B cell malignant lymphoma of the brain (1989)
    Springer
    Acta neuropathologica 79 (1989), S. 27-29 
    Details
    ISSN: 1432-0533
    Keywords: Malignant lymphoma ; Non-Hodgkin lymphoma ; Brain tumor ; Tumor-infiltrating lymphocyte ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An immunohistochemical study was performed on small lymphoid cells present in frozen tissue sections of seven cases of primary B cell malignant lymphomas of the brain by using monoclonal antibodies to T cell (Leu-1, OKT-11, Leu-3a, and Leu-2a) and B cell (BA-1 and Leu-12) surface markers. In all the seven cases, positive reaction for Leu-1 and OKT-11 was seen in the majority of the small lymphoid cells which were dispersed among the lymphoma cells or clustered around blood vessles. The large neoplastic cells were unstained by these antibodies. Staining for T cell subsets with antibodies to Leu-3a and Leu-2a showed heterogeneous staining in each case. The ratio of Leu-3a+ to Leu-2a+ cells was less than one in six cases, demonstrating a suppressor/cytotoxic phenotype predominance. Most of these small lymphoid cells were negatively stained by antibodies to BA-1 and Leu-12. From these findings, it was shown that the small lymphoid cells observed in primary B cell lymphomas of the brain were of T cell lineage, distinct from the neoplastic cells, and probably reactive in nature. The implications of these findings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308953
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  • 7
    Electronic Resource
    Electronic Resource
    Tetrodotoxin-producing bacteria from the blue-ringed octopus Octopus maculosus (1989)
    Springer
    Marine biology 100 (1989), S. 327-332 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several live specimens of the blue-ringed octopus Octopus maculosus were collected from the Philippines in November 1985, and from Japan in February 1986, and the distribution of toxicity, along with toxin composition, in the posterior salivary gland and other soft parts were examined. Tetrodotoxin (TTX: 1400 mouse units g-1) was detected in the posterior salivary gland of a Japanese specimen, while not only the salivary gland but other soft parts were toxic in the Philippine specimens. The Philippine specimens contained TTX and anhydrotetrodotoxin, the Japanese specimen TTX, 4-epitetrodotoxin, and an unknown toxin. The posterior salivary gland, intestine and other parts were excised from the Philippine specimens and examined for bacterial flora. Twenty-two dominant strains were isolated and cultured in a 2xORI medium (Ocean Research Institute, Simidu and Tsukamoto 1985) at 20°C for 20 to 48 h. Cells were harvested by centrifugation, and disrupted by ultrasonication. The toxins were partially purified from the cell lyzate by ultrafiltration and Bio-Gel P-2 column-chromatography. Instrumental analyses disclosed that 16 of the 22 strains produced TTX and/or related substances. Six strains which clearly exhibited TTX productivity were identified as Alteromonas (2 strains), Bacillus (2), Pseudomonas (1) and Vibrio (1), based on biochemical and biological characteristics. Of these, one strain each of Bacillus and Pseudomonas produced TTX at a level detectable by the mouse assay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391147
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  • 8
    Electronic Resource
    Electronic Resource
    Bile acids promote carcinogenesis in the remnant stomach of rats (1989)
    Springer
    Journal of cancer research and clinical oncology 115 (1989), S. 423-428 
    Details
    ISSN: 1432-1335
    Keywords: Bile acid ; Surgical procedure ; Rat remnant stomach ; Carcinogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We examined the tumor-promoting activity of sodium taurocholate in the remnant stomach of rats. Ninety male Wistar rats, 8 weeks of age, were separated into four groups. In group I, the rats were given N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) at a concentration of 83 mg/l in drinking water for 15 weeks, and distal partial gastrectomy was performed by Roux-en-Y procedure to prevent duodenal reflux into the remnant stomach. Thereafter, a diet containing 0.25% sodium taurocholate was given for 43 weeks. The group II rats were given MNNG and gastrectomy and were then given the usual commercial diet. The rats in group III were given gastrectomy and sodium taurocholate and no previous administration of MNNG. Only MNNG was given to the rats in group IV. The incidence of malignant tumors in the remnant stomach was 40.9% (9/22), 27.3% (6/22), and 0% (0/22) in groups I, II, and III, respectively, while the incidence in the area corresponding to the remnant stomach (control) was 8.3% (2/24) in group IV. The difference in tumor incidence was statistically significant (P〈0.05) between groups I and IV but not between groups II and IV, and not between groups I and II. Six of nine tumors in group I and all six tumors in group II were located in the anastomotic area. These results suggest that sodium taurocholate promotes tumor production in the remnant stomach, and that the surgical procedure may well be associated with this enhanced tumor occurrence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393330
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  • 9
    Electronic Resource
    Electronic Resource
    Nucleon transfer in highly mass-asymmetric reaction systems between197Au and relatively light projectiles in the energy region below 10 MeV/u (1989)
    Springer
    The European physical journal 332 (1989), S. 61-69 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mechanisms of heavy-ion induced nuclear reactions in mass-asymmetric systems were studied by focusing on the nucleon transfer reaction. Excitation functions and projected mean recoil ranges for the target-like products in37-,16O-,14N-, and12C-induced reactions on197Au were measured by means ofγ-ray spectrometry. The energy range studied was near the Coulomb barrier of the systems with incident energies below 10 MeV/u. Nucleon transfer reactions were discussed by distinguishing the products from quasi-elastic transfer (QET) and those from deep inelastic transfer (DIT). The tendency towards equilibration of theN/Z value and the energy damping, which are the characteristic features of DIT, were found in the production of Au isotopes. Observations are consistent with the generally accepted concept that QET takes place along a trajectory near the Coulomb trajectory. QET was made to be connected with the interaction radius and most of the cross section ratios were reproduced well by an extended tunneling model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292581
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  • 10
    Electronic Resource
    Electronic Resource
    Nucleon transfer in highly mass-asymmetric reaction systems between197au and relatively light projectiles in the energy region below 10 MeV/u (1989)
    Springer
    The European physical journal 332 (1989), S. 71-81 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.Lm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Kinetic energy spectra and angular distributions of projectile-like products in an16O-induced reaction on197Au were measured by counter method at projectile energies of 8.8 MeV/u and 6.6 MeV/u. The mechanism of nucleon transfer reaction was discussed in terms of distinct groups of the products from quasi-elastic transfer (QET) and of those from deep inelastic transfer (DIT). Observations indicated that QET takes place along a trajectory near the Coulomb trajectory. Damped components of the projectile-like products observed were concluded to be produced in a very short interaction time. Cross sections of these products were reproduced by the sum rule model better than by the diffusion model, and their total kinetic energies can be explained well by a recoil formula by Siemens et al. with an assumption of a short-time interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292582
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