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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for microfloral succession on allochthonous plant litter in Apalachicola Bay, Florida, USA (1977)
    Springer
    Marine biology 41 (1977), S. 229-240 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in hydrolytic, respiratory,catabolic and lipid biosynthetic activities depend at least in part on successional changes in the microfloral populations of allochthonous plant litter incubated in a semi-tropical estuary. Initial colonization is by populations which have a high content of muramic acid relative to the adenosine triphosphate (ATP) and which are progressively displaced by a microflora with a lower ratio of muramic acid to ATP. Scanning electron micrography of the plant-litter microflora shows a succession of forms, with an initial bacterial colonization and its progressive displacement by more complex forms. Estimates of the microbial mass and the rates of phospholipid synthesis suggest that the detrital microflora has a relatively slow growth rate compared to its growth potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394909
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  • 2
    Electronic Resource
    Electronic Resource
    Bacterial bioconcentration of chlorinated hydrocarbon insecticides from aqueous systems (1975)
    Springer
    Microbial ecology 2 (1975), S. 43-59 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The prevalence of chlorinated hydrocarbon insecticide uptake by chemoorganotrophic bacteria has been investigated. Thirteen bacterial species were observed to sorb and concentrate (bioconcentratc)α-chlordane,β-chlordane, dieldrin, heptachlor epoxide, and lindane from aqueous systems. Bioconcentration, as expressed by the ratio of cellular insecticide in ng/mg (dry wt) to supernatant insecticide in ng/μl, ranged from 10 for lindane byEnterobacter aerogenes to a high of 55,900 forβ-chlordane byCaulobacter vibrioides var.limonus. Amounts of cellular chlorinated hydrocarbon insecticides (CHI) detected and the bioconcentration ratios were observed to have the following order in magnitude:α- orβ-chlordane 〉 dieldrin 〉 heptachlor epoxide 〉 lindane. This decreasing order was the inverse of reported water solubilities for the CHI and the inverse relationship was mathematically defined. The CHI were not easily removed from cells by washing (desorbing) and desorption was directly proportional to insecticide water solubility. Uptake of the CHI was rapid, near-maximum amounts being sorbed within 15 min, and pH 7 appeared optimal for bioconcentration as examined over the range pH 6 to 8. Implications of this investigation are that bioconcentration of CHI by bacteria might serve as a means of introducing these toxic compounds into aquatic food chains and that the bioconcentration phenomenon might lend itself as a treatment procedure for the intentional removal of residual CHI from water supplies and wastewater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010380
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  • 3
    Electronic Resource
    Electronic Resource
    Stabilization of silicon-based devices in ion-containing media using thin Al2O3 platelets and MoS2 oriented thin films (1995)
    Springer
    Applied physics 62 (1995), S. 39-42 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 85.30; 77.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  A simplified analogue to an Ion-Sensitive Field-Effect Transistor (ISFET) was tested in the presence of ions. The gate electrode in an ISFET is an aqueous solution, unlike in a Metal-Oxide Field-Effect Transistor (MOSFET) where the gate is a metal. A problem with the ISFET is that the insulating oxide between the silicon and the solution is slowly penetrated by various ions such as OH− or Na+ causing a change in the characteristics of the device. The application of thin alumina platelets and thin MoS2 films as a protective insulating layer, when deposited over the insulating silicon oxide, was tested against the penetration of ions. It is shown that there is a significant decrease in the ion penetration through to the silicon oxide layer, depending on the applied bias, when the oxide is covered with thin alumina or MoS2 layers. The effect of different ions and ion concentrations are presented. Suggestions for further improvement are made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01568085
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  • 4
    Electronic Resource
    Electronic Resource
    A highly sensitive and selective hydrogen gas sensor from thick oriented films of MoS2 (1996)
    Springer
    Applied physics 63 (1996), S. 271-275 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract.  A new process is developed to fabricate a highly sensitive and selective hydrogen sensor by depositing a partially crystalline and highly oriented film of MoS2 from its single layer suspension on an alumina substrate. When these films are promoted with some catalysts selected from Pt-group metals (Pt, Pd, Ru or any combination of these metals) they exhibit a high sensitivity and selectivity to hydrogen gas. Unlike other metal oxide sensors which are sensitive to many reducing and oxidizing gases and operate at a temperature of 350 °C or higher, this sensor is highly selective to hydrogen gas and its operating temperature is from 25 to 150 °C. The lower operating temperature enhances safety when dealing with hydrogen gas. The sensor response to hydrogen at 120 °C is linear in concentration from 30 to 104 ppm with a 10 to 30 second response time and a 45 to 90 second recovery time. Above 104 ppm the sensor is still linear but the slope of conductance versus hydrogen concentration changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01567880
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  • 5
    Electronic Resource
    Electronic Resource
    High-Temperature Static and Dynamic Reliability Study of 4H-SiC Vertical-Channel JFETs for High-Power System Applications (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 1051-1054 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work we report the most recent high-temperature long-term reliability results ofthe 600 V/14 A, 4H-SiC vertical-channel junction field-effect transistors (VJFETs). Two groups (Aand B) devices were subjected to different thermal and electrical stresses. One device (Group A)reached 12,000 hours of continuous switching without a single failure. Four devices in Group Awere thermally stressed at 250 °C over 4,670 hours in air, for which standard deviation of thespecific on-resistance (RONSP) in linear region at gate bias (VGS) of 3 V were 〈 4.1% throughout theentire duration time. The off-state characteristics were evaluated by high temperature reverse bias(HTRB) tests. Three devices (Group A) were biased at 50% rated BVDS at 250 °C for 2,278 hours.A higher reverse bias at 80 % rated BVDS was then applied to 14 devices (group B) at 200 °C for1,000 hours. Variations of the leakage current were negligible throughout the entire HTRB test forall tested devices
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.1051.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Bacterial Movement Through Fractured Bedrock (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 11 (1973), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The movement of bacteria-laden waters percolating through fractured crystalline bedrock in mountainous terrain was examined to determine whether effluent originating from domestic waste disposal systems could contaminate shallow ground-water supplies. Inoculated waters were injected into holes and/or wells at two geologically different test sites (granitic, metamorphic) to evaluate the extent of microbial filtration in or along bedrock fractures. Microbiological examination of tracer waters, sampled both above and below the zone of saturation, was made.Field studies showed that the direction and rate of movement of contaminated ground waters were controlled largely by the anisotropic nature of the geologic stratum, particularly by the orientation of major bedrock fracture sets. Inoculated waters were found to be readily transported by the ground-water gradient into a downslope well. At one test site, a tracer bacterium traversed a horizontal distance of 94 feet in 24-30 hours. Continued bacteriological analysis of the contaminated well found the organism to be present for at least five days after inoculation of the upslope well.In the zone of aeration, bacteria-laden effluent was found to percolate in or along fractures with inadequate filtration prior to entering the ground water. Studies conducted in metamorphic rock demonstrated that while fecal-type bacteria decreased slightly during percolation through bedrock fractures, total bacterial densities were generally unchanged.From the hydrogeological and microbiological data obtained at both test sites, it can be concluded that moderate percolation rates and minimum distances between water wells and leachfield type waste disposal units are inadequate to protect potable ground-water supplies from contamination in mountainous terrain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1973.tb02960.x
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  • 7
    Electronic Resource
    Electronic Resource
    Chromium oxide gas sensors for the detection of hydrogen, oxygen and nitrogen oxide
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 21 (1994), S. 1-4 
    Details
    ISSN: 0925-4005
    Keywords: Chromium oxide ; Hydrogen sensors ; Nitrogen oxide sensors ; Oxygen sensors
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4005(93)01208-L
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of surface films on photoelectrochemical solar cell performance
    Amsterdam : Elsevier
    Applications of Surface Science 10 (1982), S. 493-505 
    Details
    ISSN: 0378-5963
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-5963(82)90153-2
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Photoanodic properties of an n-type silicon electrode in aqueous solutions containing fluorides
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 144 (1983), S. 113-120 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(83)80047-1
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  • 10
    Electronic Resource
    Electronic Resource
    Anodic properties of n-Si and n-Ge electrodes in HF solution under illumination and in the dark
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 147 (1983), S. 157-166 
    Details
    ISSN: 0368-1874
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0368-1874(83)80172-5
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