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  • 1
    Electronic Resource
    Electronic Resource
    Base- and sequence-dependent binding of aristololactam .beta.-D-glucoside to deoxyribonucleic acid (1991)
    s.l. : American Chemical Society
    Biochemistry 30 (1991), S. 3715-3720 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00229a018
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  • 2
    Electronic Resource
    Electronic Resource
    Humidity sensor using conductivity type transducer (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4367-4369 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The alternating current conductance of ammonium paratungstate pentahydrate (APT⋅5H2O) is found to change sensitively (response time ∼3 min) with changes in relative humidity, but to remain practically independent over a wide range of frequency (100 Hz–10 KHz) and temperature (up to 80 °C). This property of APT⋅5H2O has been utilized to design a sensitive humidity sensor. A circuit has been developed whose output is a voltage varying with relative humidity. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145329
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  • 3
    Electronic Resource
    Electronic Resource
    High-scan-range cryogenic scanning probe microscope (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 4170-4173 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have designed and constructed a scanning probe microscope operable at temperatures down to 260 mK within a top-loading helium-3 cryostat. It achieves a large scan range with the sample situated near the bottom of the scanning head—maximizing the cooling efficiency of the liquid helium. The scan head is completely thermally compensated, thus eliminating thermal expansion and contraction on cooling and warm-up, as well as thermal drift during operation. We demonstrate the performance using two distinct scanning probe methods: scanning tunneling microscopy and charge accumulation imaging. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1315354
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  • 4
    Electronic Resource
    Electronic Resource
    Charged perfect fluid in rigid rotation (1985)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 26 (1985), S. 1752-1754 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: This paper is a continuation of the work of Bonnor and Raychaudhuri on a charged dust distribution in rigid rotation in general relativity. Here the authors are concerned with the similar problem of a charged perfect fluid with nonvanishing pressure. As in Raychaudhuri's work, symmetry-independent reduction of Einstein–Maxwell equations is undertaken. Certain assumptions in Raychaudhuri's paper regarding the inheritance by the electromagnetic field of the symmetry resulting from the rigidity of the motion are justified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.526886
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  • 5
    Electronic Resource
    Electronic Resource
    Direct current conductivity and oxygen gas-sensing properties of iron–antimony–tellurite glasses (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5520-5525 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Iron tellurite glasses in the system Fe2O3–Sb–TeO2 have been prepared by the melt-quenching technique. The glass forming region for the above system has been determined. A comparative study of the direct current electrical conductivity, σ, of the 15Fe2O3–5Sb–80TeO2 (mol%) glass together with 15Fe2O3–5Sb2O3–80TeO2 and the binary 15Fe2O3–85TeO2 glass has been made in the temperature range 463–598 K. The 15Fe2O3–5Sb–80TeO2 glass was found to be most conductive (σ=1.39×10−5 S cm−1 at 503 K) in this series. The semiconducting behavior of these glasses could be explained by the small polaron hopping model. The oxygen gas-sensing property of the 15Fe2O3–5Sb–80TeO2 glass was investigated. The O2 gas sensitivity at 598 K was found to be 8.1. The variation in conductivity on alternate switching of gas atmospheres between oxygen and argon was found to be reproducible. An attempt has been made to clarify the mechanism of conductivity response considering the phenomenon of surface adsorption followed by bulk diffusion. From the investigation of the gas-sensing behavior, the present glass was found to be a potential candidate for an oxygen gas sensor. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366542
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  • 6
    Electronic Resource
    Electronic Resource
    Evidence of swelling of SiO2 upon thermal annealing (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 3075-3077 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrathin SiO2 film was thermally grown on Si(001) substrate by dry oxidation and wet oxidation processes. The films were then subjected to thermal annealing (TA) at 1000 °C for 30 min. The structural characterization of the as-grown and the TA samples was carried out using the grazing incidence x-ray reflectivity technique. The analysis of the x-ray reflectivity data was carried out by using a model independent formalism based on the distorted wave Born approximation for obtaining the electron density profile (EDP) of the film as a function of depth. The EDP of both films show a decrease in the electron density as well as an increase in their thickness when the films are subjected to TA. It has also been observed that the total number of electrons is conserved in the oxide film after TA. Our analysis of the x-ray reflectivity data indicates that the SiO2 film swells and its interface with the substrate modifies upon TA. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1473863
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  • 7
    Electronic Resource
    Electronic Resource
    Ovary colonization by Claviceps africana is related to ergot resistance in male-sterile sorghum lines (2003)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 52 (2003), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Ergot, caused by Claviceps africana, has emerged as a serious threat to sorghum hybrid seed production worldwide. In the absence of gene-for-gene-based qualitative resistance in commercial cultivars, varieties with high pollen production that can escape ergot infection are preferred. Recent demonstration of differences in ergot susceptibility among male-sterile lines has indicated the presence of partial resistance. Using chitin-specific fluorescin-isothiocyanate-conjugated wheat germ agglutin and callose-specific aniline blue, this study investigated the process of sorghum ovary colonization by C. africana. Conidia germinated within 24 h after inoculation (a.i.); the pathogen was established in the ovary by 79 h a.i., and at least half of the ovary was converted into sphacelial tissue by 120 h a.i. Changes in fungal cell wall chitin content and strategic callose deposition in the host tissue were associated with penetration and invasion of the ovary. The rate of ovary colonization differed in three male-sterile lines that also differed in ergot susceptibility. This work demonstrates a possible histological basis for partial resistance in male-sterile sorghum lines that could lay the foundation for variety improvement through further breeding and selection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2003.00886.x
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  • 8
    Electronic Resource
    Electronic Resource
    Quantitative relationships between Colletotrichum gloeosporioides infection of Stylosanthes scabra and weather under field conditions (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 44 (1995), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In a field study over three successive years (1990-92), quantitative relationships were established between infection by the anthracnose pathogen Colletotrichum gloeosporioides and weather. In order to detect successful spread and infection, groups of healthy seedlings of the tropical pasture legume Stylosanthes scabra were exposed to natural inoculum for 7 h (daytime), 17 h (overnight), 24 h and 48 h and then incubated in environments with different levels of relative humidity (r.h). Infection was generally associated with rainfall, hours r.h. 〉95% and mean hourly r.h. in the 1990 and 1992 seasons with average rainfall. Inoculum availability was an important determinant of the number of infections in the dry 1991 season. Quantitative relationships between infection and weather conditions for the exposure periods in the three seasons were established using multiple regression analysis. A regression equation containing hours of r.h. 〉95%, mean hourly r.h. and temperature was developed from a combined analysis of the 48-h exposure data from 1990 and 1992. A parallelism test showed that the regression equation was equally applicable to infection data in each of the two years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1995.tb02716.x
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  • 9
    Electronic Resource
    Electronic Resource
    Monsoon-induced sea surface temperature changes recorded in Indian corals (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Terra nova 5 (1993), S. 0 
    Details
    ISSN: 1365-3121
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The South Asian Summer Monsoon induces vertical mixing in the surface Arabian Sea, leading to a reduction in the Sea Surface Temperature (SST) of the order of 3–4°C. This reduction in temperature is recorded by modern corals (Porites) that grow in the Lakshadweep Islands (coralline islands located at about 350 km off the south-west coast of India) in their stable oxygen isotope ratios (denoted by δ18O). As large coral colonies of this genus are available, our results show that palaeomonsoon records for a few centuries back in time, a crucial input for climatic models aimed at predicting the Asian Monsoon, can be obtained from these corals. We also show that two corals separated by ˜ 60 km show similar (518O variations as does a giant clam (Tridacna maximus) that grew near one end of the coral colonies. As this clam is known to precipitate CaCO3 in isotopic equilibrium with the ambient sea-water, it is possible to estimate the isotopic offset of coralline δ18O from that of the CaCO3 precipitated in isotopic equilibrium. This ‘disequilibrium effect’ appears to be constant around 4.5±0.2%0. Our calculations show that SST (t, °C) is related to the coral δ18O (δc) and the sea-water δ18O (δw) by the equation t = 3.0–4.68 (δc - δw), which is in good agreement with such relationships for corals from the Pacific and Atlantic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3121.1993.tb00303.x
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  • 10
    Electronic Resource
    Electronic Resource
    Quantitatively expressed resistance to anthracnose (Colletotrichum gloeosporioides) in Stylosanthes scabra (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Nineteen accessions of Stylosanthes scabra that had low terminal severities of anthracnose in the field were evaluated for their response in the glasshouse using four isolates representing three different races of Colletotrichum gloeosporioides. Accessions could be allocated to one of three groups: one showed a higher disease severity after inoculation with isolate UQ14 compared to the other isolates; the second showed a higher severity after inoculation with isolates WRS32 and/or WRS20 compared to isolates SR4 and UQ14, and the third group showed moderate to low disease severities following inoculation with all four isolates. Based on reduced disease severity and compatible infection types, a set of six accessions was selected from the three groups for further testing, two of which showed no significant difference in their response to the four isolates. Two components of resistance, incubation period and infection efficiency were studied in the selected accessions. Of these, incubation period appeared unrelated to the expression of resistance. Criteria for identifying this form of quantitatively expressed resistance are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1988.tb02111.x
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