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  • 1995-1999  (4)
  • 1985-1989  (5)
  • 1999  (4)
  • 1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Novel characterization of implant damage in SiO2 by nuclear-deposited energy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1106-1108 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Etching enhancement in through-implanted SiO2 has been characterized by nuclear-deposited energy independently of implant conditions. An empirical expression has been proposed to describe the etching rate for any implantation. The enhanced etching has been related to the Si-O vibrational frequency shift. Etching enhancement has been found to reflect the structural change in SiO2, and to be a good measure of degradation. The structural change of SiO2 stops and the etching rate reaches a maximum for an ion dose corresponding to nuclear-deposited energy larger than 3.4×1023 eV/cm3. This energy is equal to the total SiO bonding energy (3.8 eV) in a unit volume of SiO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101429
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In situ observation by ultrahigh vacuum reflection electron microscopy of terrace formation processes on (100) silicon surfaces during annealing (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1400-1402 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Formation processes of terraces on (100) silicon surfaces during annealing at 1000 °C were observed in situ by ultrahigh vacuum reflection electron microscopy. Terraces were formed on staircases made up of monoatomic steps, preferentially at the sites where stairs were larger than average. The sites are formed by surface undulation. It was found that the terrace grew, or extended, in both up-step and down-step directions almost at equal rates. The terrace thus grew not by sublimation, but by adhesion and removal of atoms at respective terrace edges. Thus, the interlayer migration of adatoms plays an important role in the terrace growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101606
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Polarized XAFS study of the atomic displacements and phase transitions in KNbO3 (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 367-369 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049599001351
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Electron microscope analyses of domains and discommensurations in ferroelectric Rb2ZnCl4. Erratum (1989)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 45 (1989), S. 146-146 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The following corrections should be made in Tsuda, Yamamoto & Yagi [Acta Cryst. (1988). A44, 864-870]. (1) 'only two kinds of domain boundaries' in the Abstract should be changed to 'two kinds of image contrast of domain boundaries'. (2) The expressions for h2, h4, h6 in § 4.1 should be replaced by h2: -x -y -z + h4: -x -y -z (inversion) h6: -x -y -z + (3) "two kinds of DC's showing different contrast' in the second paragraph in § 4.1 should be changed to 'two kinds of DC contrast'.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767388012395
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  • 5
    Electronic Resource
    Electronic Resource
    Repression of nitrogenase by ethanol in nitrogen-deprived cultures of Rhodovulum sulfidophilum (1999)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 171 (1999), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Light-dependent H2 evolution did not occur in nitrogen-deprived cultures of Rhodovulum sulfidophilum in the presence of ethanol. When ethanol was added to cells which had been grown with ammonia, derepression of the nitrogen fixation genes (nifHD) was inhibited at an ethanol concentration of 1 mM. On the other hand, when cells had nitrogenase-catalyzed proton-reducing activity prior to ethanol addition, reduction of the nifHD transcript level did not occur after the addition. In cells grown with ammonia, concomitant addition of an auxiliary oxidant such as dimethylsulfoxide or sodium bicarbonate resulted in derepression of nitrogenase activity in the presence of ethanol. These results suggest that the electron-accepting process is necessary for derepression of nif genes in cultures which use ethanol as the electron donor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1999.tb13421.x
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  • 6
    Electronic Resource
    Electronic Resource
    Petrology and magnetic properties of the Chiang Khan, Thailand, meteorite (1989)
    Springer
    Mineralogy and petrology 40 (1989), S. 173-182 
    Details
    ISSN: 1438-1168
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Summary The Chiang Khan meteorite fell on 18th November, 1981 at Chiang Khan, Thailand. It consists of olivine, orthopyroxene, clinopyroxene, Fe-Ni metal, troilite, chromite, plagioclase, glass, and phosphate in order of abundance. Olivine forms barred or porphyritic chondrules, and its composition is uniform (average Fo80.2), close to the average composition of olivine in equilibrated H chondrites. Orthopyroxene and clinopyroxene also have compositions similar to those in equilibrated H chondrites. Both well-defined chondrules and their broken fragments are present in the recrystallized matrix. Microcrystalline plagioclase and clinopyroxene often occur in the groundmass of chondrules, but clear interstitial plagioclase is absent. Chemical composition of chromite plots in the field of chromites in H chondrites. Chiang Khan meteorite is thus classified as an equilibrated H 5 type chondrite. The equilibrium temperatures estimated by using mineral pairs are as follows: Opx-Cpx 800–900°C; Ol-Chromite 510°C. Water content is 0.24 wt %, and the hydrogen isotopic composition (ΔD) is −89.5‰ In the thermal demagnetization experiment magnetization steadily decreased from 0 to 500°C, whereas the remanent magnetization obtained in the A.C. demagnetization experiment is very unstable, probably owing to the large grain size of the Fe-Ni metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01164487
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  • 7
    Electronic Resource
    Electronic Resource
    Positive telomerase activity in the majority of bile duct carcinoma (1999)
    Springer
    International journal of clinical oncology 4 (1999), S. 338-342 
    Details
    ISSN: 1437-7772
    Keywords: Key words Telomerase ; Bile duct carcinoma ; Malignancy grade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background. Studies of human tumors and human tumor cell lines indicate that telomerase activity may play a critical role in the tumor cell growth by sustaining cellular immortality. Telomerase activity has been detected in different percentages in various carcinomas, but the incidence of positive telomerase activity in bile duct carcinomas and surrounding normal bile duct tissues in its relation with malignancy grades of tumors, depth of invasion, lymphatic and vascular invasion, and lymph node metastases has not been studied. Methods. Telomerase activity was assayed in surgically resected specimens of seven human bile duct carcinomas and seven adjacent nonneoplastic tissues using the PCR-based Oncor TRAP (a telomeric repeat amplification protocol)-eze telomerase detection kit. The correlation between the results of telomerase activity and clinicopathological data was examined. Results. The telomerase activity was detected in six of seven (86%) bile duct carcinoma cases with only one negative case in our series, whereas no telomerase activity was detected in nonneoplastic adjacent bile duct tissues. Although the number of cases in our study was small, telomerase activity was regarded as independent of tumor grade, depth of invasion, lymphatic and intravascular invasion, or lymph node metastasis. Conclusions. These results indicate that increased telomerase activity is a common phenomenon in the majority of bile duct carcinomas, and that it is negative in nonneoplastic bile duct tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101470050081
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    EXAFS studies of KBr1−x(NO2)x mixed crystals (1999)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 6 (1999), S. 486-488 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049599000928
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  • 9
    Electronic Resource
    Electronic Resource
    Expression of the mutant gene for L-gulono-γ-lactone oxidase in scurvy-prone rats (1989)
    Springer
    Cellular and molecular life sciences 45 (1989), S. 126-129 
    Details
    ISSN: 1420-9071
    Keywords: L-gulono-γ-lactone oxidase ; ascorbic acid deficiency ; enzyme defect ; rat ; nuclei acid hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A mutant strain of Wistar rats with L-gulono-γ-lactone oxidase deficiency has recently been established. To investigate this deficiency by DNA and RNA blot hybridization analyses, a fragment of a previously cloned cDNA encoding rat L-gulono-γ-lactone oxidase was used as a probe. When genomic DNA of the mutant rat was digested with several restriction enzymes, the probe hybridized to fragments of the same sizes as those produced from DNA of normal rats. Poly(A)+RNA from the liver of the mutant rat was found to contain an L-gulono-γ-lactone oxidase-specific mRNA of a normal size at a comparable level to that of normal rats. An in vitro translation experiment revealed that the mRNA programmed the synthesis of an enzyme protein which had the same molecular weight as that of the translational product of the normal mRNA, although the amount synthesized was markedly reduced as compared with that synthesized with the normal mRNA. In accordance with this observation, a very low but definite degree of L-gulono-γ-lactone oxidase activity was detected in the microsomes of the mutant rat by a newly developed, highly sensitive method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954844
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