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  • 1
    Electronic Resource
    Electronic Resource
    Spontaneous alloying of copper atoms into gold clusters at reduced temperatures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1100-1103 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The alloying behavior of copper atoms into gold clusters at temperatures lower than 300 K was examined using a 200 kV transmission electron microscope equipped with a double source evaporator in the specimen chamber. Isolated gold clusters of about 4 nm in mean diameter were prepared on a supporting film and were cooled down to 245, 215, 165, or 125 K. Copper atoms were then deposited onto the same film. Upon the deposition of copper, the gold clusters quickly changed into completely or partially alloyed clusters, depending upon the substrate temperature. The copper diffusivity estimated from such spontaneous alloying was many orders of magnitude faster than that in bulk gold. A possible mechanism behind the spontaneous alloying is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353272
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction of interferon gamma and CPT-11, a new derivative of camptothecin, in human endometrial carcinoma cell lines (1993)
    238 Main Street, Cambridge, Massachusetts 02142, USA : Blackwell Scientific Publications
    International journal of gynecological cancer 3 (1993), S. 0 
    Details
    ISSN: 1525-1438
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The anti-proliferative effects of interferon gamma (IFN-γ) and CPT-11, a new derivative of camptothecin, both singly and in combination, on two human endometrial carcinoma cell lines, HHUA and ISHIKAWA, were examined in vitro. The HHUA cells were responsive dose-dependently to IFN-γ, while the ISHIKAWA cells were unresponsive to IFN-γ. Both cell lines were responsive dose-dependently to CPT-11. In both cell lines, IFN-γ at clinically achievable concentrations (10 and 100 U ml−1 enhanced the anti-proliferative activity of CPT-11 in the range of concentrations where CPT-11 showed more than 10% cell growth inhibition. Sequential treatment with CPT-11 followed by incubation with IFN-γ resulted in significant cell growth inhibition, but not vice versa. Flow cytometric studies indicated that the combined anti-proliferative effect did not correlate with cytokinetic alterations. Treatment with IFN-γ did not change the extractable topoisomerase I activity of the HHUA and ISHIKAWA cells. The combination therapy of IFN-γ and CPT-11 could provide a new approach against endometrial cancer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1525-1438.1993.03010036.x
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  • 3
    Electronic Resource
    Electronic Resource
    Alloying behavior of gold atoms into nm-sized copper clusters (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 2173-2174 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Alloying behavior of gold atoms into copper clusters has been studied using a 200 kV transmission electron microscope (TEM) equipped with a double source evaporator in the specimen chamber. Isolated copper clusters of approximately 4 nm in diameter were first prepared on a supporting film of amorphous carbon, and then gold atoms were deposited onto the same film kept at room temperature. Upon the deposition of gold, the copper clusters quickly changed into homogeneously mixed Cu-Au alloy clusters. The gold diffusivities in the clusters estimated from the experimental results are at least 19 orders of magnitude faster than those in the bulk copper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108285
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  • 4
    Electronic Resource
    Electronic Resource
    Stable cw operation at room temperature of a 1.5-μm wavelength multiple quantum well laser on a Si substrate (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 472-473 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room-temperature cw operation of an InGaAs/InGaAsP multiple quantum well (MQW) laser diode on a Si substrate is reported. The MQW laser emits at a 1.54 μm wavelength and exhibits no degradation after over 2000 h of operation. Employing a hybrid organometallic vapor phase epitaxy/vapor mixing epitaxy method and a layer structure for improving crystalline quality, high-quality MQW layers are obtained. A stable longitudinal mode spectrum demonstrates the effectiveness of the MQW active layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106638
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  • 5
    Electronic Resource
    Electronic Resource
    InAlAs/InGaAs metal-semiconductor-metal photodiodes heteroepitaxially grown on Si substrates (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 751-753 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To study performance and reproducibility of photodiodes (PDs) on Si in the long-wavelength region, InAlAs/InGaAs metal-semiconductor-metal PDs were fabricated on high-quality heteroepitaxial InP layers on Si substrates. A dark current of 0.5–2×10−8 A and a responsivity of 0.05–0.15 A/W were reproducibly obtained, at least at one of the ±5 V bias voltages. These dark currents and responsivity are similar to those of PDs with the same structure fabricated on InP substrates. The PDs on Si have pulse responses with full widths at half-maximum of 150–600 ps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111055
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  • 6
    Electronic Resource
    Electronic Resource
    Regulation of the Heat-Shock Response in Bacteria (1993)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 47 (1993), S. 321-350 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.47.100193.001541
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  • 7
    Electronic Resource
    Electronic Resource
    New series of superstructures based on a clinopyroxene. II. The structure of the Sc series of enstatite-IV, [Mg(̃x−7.5)/3Sc3̃][Mg2/3Si(x−4)/3]Ox, with x = 100, 112 or 124 (1984)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 126-132 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768184001865
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  • 8
    Electronic Resource
    Electronic Resource
    The structure and polytypes of α-CaSiO3 (pseudowollastonite) (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 1010-1017 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567740881004962
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  • 9
    Electronic Resource
    Electronic Resource
    Electrochromic properties of the n-heptyl viologen-ferrocyanide system (1984)
    Springer
    Journal of applied electrochemistry 14 (1984), S. 323-327 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract Electrochromic properties of the mixed solution of n-heptyl viologen dibromide (HV), Fe(CN) 6 4− and NaH2PO2 or KBr were investigated by cyclic voltammetry and the transparency-time relation. When Fe(CN) 6 4− is added to a HV solution the mixture colours violet without inputting any voltage. However, the colour fades gradually by further addition of NaH2PO2, and the transparency of the mixture increases with addition of larger amounts of NaH2PO2. The same effect was observed by addition of KBr to the HV-Fe(CN) 6 4− solution. The input voltage required for the electrochromism of HV is lowered considerably by addition of Fe(CN) 6 4− , when NaH2PO2 or KBr plays a role in controlling the colouringerasing phenomena. The HV-Fe(CN) 6 4− -KBr system showed some HV ‘residue’ in the cyclic voltammogram on an indium-tin oxide (ITO) electrode, while no such HV ‘residue’ was observed in the HV-Fe(CN) 6 4− -NaH2PO2 system. The HV-Fe(CN) 6 4− -NaH2PO2 system is superior in colouring-erasing reproducibility and in response time to the HV solution or the HV-Fe(CN) 6 4− system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01269932
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  • 10
    Electronic Resource
    Electronic Resource
    Biological activity of enantiomerically pure forms of insect juvenile hormone I and III inBombyx mori (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 220-221 
    Details
    ISSN: 1420-9071
    Keywords: Juvenile hormone ; enantiomer ; biological activity ; Bombyx mori ; allatectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Biological activity of enantiomerically pure juvenile hormones was assayed by topical application on allatectomizedBombyx fourth instar larvae. JHs tested were (10R)-JH I [methyl (2E,6E,10R,11S)-10,11-epoxy-3,11-dimethyl-7-ethyl-2,6-tridecadienoate], (10S)-JH I [methyl (2E, 6E, 10S, 11R)-10,11-epoxy-3,11-dimethyl-7-ethyl-2,6-tridecadienoate], (10R)-JH III [methyl (2E,6E,10R)-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate] and (10S)-JH III [methyl (2E,6E,10S)-10,11-epoxy-3,7,11-trimethyl-2,6-dodecadienoate]. Among these compounds, natural (10R)-JH I was most active and the dose needed to induce 50% larval molting was 0.04 μg/larva; it was approximately 12,000 times more active than unnatural (10S)-JH I. Though natural (10R)-JH III showed slight biological activity, it was only one three-thousandth of that of (10R)-JH I. Unnatural (10S)-JH III exhibited no biological activity at the levels assayed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02027321
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