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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 4853-4860 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The fabrication and electrical performance of an all refractory, eight mask step, NbN medium scale integrated circuit process are discussed. In situ rf sputter deposited trilayers of NbN/MgO/NbN are plasma etched to fabricate Josephson junctions. A novel low temperature, plasma enhanced chemical vapor deposited SiO2 film is used for wiring and resistor insulation. Sputter deposited molybdenum films are used for resistors. Tunnel junctions fabricated with this process have Vm=61 mV at jc=1100 A/cm2, and Vg = 5.1–5.2 mV at 4.2 K. Critical currents are uniform to within ±3% for 101 junction strings and are within ±25% over all die on 3 in. wafers. This process has been used to fabricate 8-bit single flux quantum counter circuits, squid magnetometer circuits, 870 junction strings, and arrays of 256 squids. Preliminary circuit testing indicates operation at temperatures within the range of small closed-cycle refrigerators.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of child psychology and psychiatry 9 (1968), S. 0 
    ISSN: 1469-7610
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 15 (1989), S. 0 
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The macroscopic, light microscopic and ultrastructural findings in a case of pancreatoblastoma in a neonate are presented. No evidence for exocrine or endocrine secretion could be found by histochemistry, immunocytochemistry or electron microscopy. However, enzyme histochemical techniques to localize activity of ‘glucose-6-phosphatase’, acid phosphatase, esterase and esteroprotease supported both a pancreatic origin for the tumour and a biphasic pattern of differentiation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 53 (2002), S. 0 
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Results from the pioneering research on the interactions between pH and denitrification in soil from the 1950s to the present are reviewed, the changing perceptions of this complex relationship are discussed, and the current status of the subject is assessed. Facets of this relationship that are analysed in detail include the direct or indirect influence of pH on overall denitrification rates in soils, changes in the composition of gaseous products that depend on pH, methods for measuring the process, the concept of an optimum pH for denitrification, and the adaptation of microbial denitrifying communities to acidic environments. The main conclusions to be drawn are as follows. Total gaseous emissions to the atmosphere (N2O, NO and N2) have repeatedly been shown to be less in acidic than in neutral or slightly alkaline soils. This may be attributable to smaller amounts of organic carbon and mineral nitrogen available to the denitrifying population under acid conditions rather than a direct effect of low pH on denitrification enzymes. Numerous laboratory and field studies have demonstrated that the ratio N2O:N2 is increased when the pH of soils is reduced. The relation between soil pH and potential denitrification as determined by various incubation methods remains unclear, results being influenced both by original conditions in soil samples and by unknown changes during incubation. The concept of an optimum pH for denitrification has been frequently proposed, but such a term has little or no meaning without reference to specific attributes of the process.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 107 (1999), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Analysis of the flavonoid content of seed and root exudates of Lotus pedunculatus was undertaken using multiple coupled analytical techniques: capillary zone electrophoresis coupled to a UV spectral array detector (CZE-UV), high performance thin-layer chromatography with densitometry (HPTLC-UV) and gas chromatography with mass spectrometry (GC-MS). These procedures provided separation, identification and structural confirmation of the previously unidentified flavonoids in this plant's seed and root exudates and were particularly applicable to samples from a small seeded legume. Catechin, naringenin, kaempferol, quercetin aglycone and 3 different glycosides of quercetin were detected in seed exudate. Sterile root exudates contained catechin, naringenin and quercetin in addition to apigenin, kaempferol and other flavones and flavanones for which partial identifications were obtained. When sterile root exudate was incubated with Mesorhizobiumloti, changes in its flavonoid content were detected. Analysis of bacterial cells after incubation revealed the presence of quercetin, kaempferol and one other flavone. The monocyclic aromatics protocatechuic acid and phloroglucinol were detected in both the incubated root exudate and its bacterial cells.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 744-746 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SATURATED fatty acids have been found in O recent sediments, ancient sediments, and waters produced with petroleum. Acids having odd numbers of carbon atoms have been found along with those having even numbers of carbon atoms. Acids were obtained from sediments by extraction with a refluxing ...
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 168 (1997), S. 193-198 
    ISSN: 1432-072X
    Keywords: Key words Competition ; Nodulation ; Rhizobium ; leguminosarum bv. trifolii ; Trifolium repens ; Acidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Detailed individual nodulation profiles were obtained for five strains of Rhizobium leguminosarum biovar trifolii inoculated onto roots of Trifolium repens seedlings growing on an agar medium of pH 4.5. The time of appearance and the location of every nodule were noted for a period of 10 days after inoculation. Using these nodulation frequency profiles, pairings of strains were identified and six mixed-strain inoculation (1:1 ratio) experiments were subsequently performed at pH 4.5. Results from the mixed-inoculum experiments showed that the performance of a Rhizobium strain in single culture could not be reliably used to predict the outcome of a paired-inoculation study and that some seedlings were exclusively nodulated by rhizobia that performed poorly at low pH in single-culture inoculations.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 145 (1986), S. 435-438 
    ISSN: 1432-1076
    Keywords: Wiedemann-Beckwith syndrome ; Pancreatoblastoma ; Ultrasound of abdomen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The association of pancreatoblastoma and Wiedemann-Beckwith syndrome has not been noted previously. In this report we describe a child with Wiedemann-Beckwith syndrome who had a pancreatoblastoma resected on day 27 of life. He is also the first reported case of Wiedemann-Beckwith syndrome in a black baby.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Chromosoma 62 (1977), S. 269-278 
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Newborn Microtus agrestis were given single acute whole-body γ-irradiation (350, 500, or 750R). C-banded bone marrow preparations showed cells with radiation-induced rearrangements of constitutive heterochromatin of the sex chromosomes, usually the consequence of single events, encompassing a wide spectrum of deletions and translocations. These cells persisted in bone marrow for more than a year after irradiation; however, many cells showing the same redistribution of heterochromatin constituted clones of both deletions and translocations. These results indicate that deletion or rearrangement of constitutive heterochromatin does not impair the capacity of bone marrow cells for further proliferation.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Methods in cell science 4 (1978), S. 757-759 
    ISSN: 1573-0603
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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