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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of 2-Arylcyclohexanones. I. Unsaturated Lactones Formed by Glyoxalation1 (1950)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 1995-2000 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01161a033
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions of 2-Arylcyclohexanones. II. The Preparation of Intermediates in the Synthesis of Resin Acids (1950)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 2000-2002 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01161a034
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions of 2-Arylcyclohexanones. III. Cyanoethylations and Mannich Reactions1 (1950)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 72 (1950), S. 3388-3392 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01164a019
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  • 4
    Electronic Resource
    Electronic Resource
    Aquatic system response to climatic and human changes: Productivity, bottom water oxygen status, and sapropel formation in Lake Lugano over the last 10 000 years (1992)
    Springer
    Aquatic sciences 54 (1992), S. 257-276 
    Details
    ISSN: 1420-9055
    Keywords: Lake Lugano (Lago di Lugano) ; palaeolimnology ; Holocene ; organic and inorganic carbon ; biogenic silica ; ostracoda ; oligochaeta cocoons ; laminated sediments ; pollen ; soil erosion ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Holocene record of Lake Lugano (southern basin: surface area 20.3 km2, maximum depth 87 m) comprising organic carbon-rich sediments (sapropels), is divided into eight intervals based on radiocarbon- and varve-dating. The content of organic carbon, inorganic carbon, and biogenic silica, as well as the benthic remains of ostracods and oligochaetes, are converted into accumulation rates and benthic abundances in order to assess past production rates and bottom water oxygen status, respectively. The results suggest three periods of distinct palaeolimnological character: (i) low primary production combined with shifts between aerobic and anaerobic profundal conditions (prior to ca. 3000 BC), (ii) moderate rates of production combined with a relatively high profundal oxygen content (after ca. 1500 BC), and (iii), high production rates (460 g C m−2 a−1) combined with anaerobic profundal conditions (present eutrophic state). Corresponding organic carbon contents in the sediments are: up to 5% (i), 4% (ii), and 8% (iii). Until the beginning of this century, the flux of autochthonous sediments to the lake floor correlated with the fluctuations in the allochthonous sediment accumulation rate, indicating that catchment erosion largely controlled lacustrine production during the Holocene history of Lake Lugano. Pollen data show catchment-vegetational transformations at ca. 3500 BC (change from fir to beech forests), at 1400 BC (onset of cereal vegetation) and at ca. A.D. 450 (strong increase in various cultural plants). The first two changes had a relatively large imprint on lacustrine sedimentation. At ca. 3500 BP, erosion increase in the catchment was triggered by vegetation changes in the mountain zone above ca. 1000 m a. s. l., which may have been induced by climatic and human alteration (drop in the treeline altitude). Maximum catchment erosion occurred at ca. 1400 BC which was clearly dominated by human cultivation during the Bronze Age. More oxygenated profundal conditions in the lake after ca. 3000 BC are possibly related to a better mixing of the lake waters during the winter season by increased wind activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00878140
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  • 5
    Electronic Resource
    Electronic Resource
    Retroisthmic cleft: a stress fracture of the lamina (2000)
    Springer
    Skeletal radiology 29 (2000), S. 162-164 
    Details
    ISSN: 1432-2161
    Keywords: Key words Retroisthmic cleft ; Stress fracture ; Laminar fracture ; Xray ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The retroisthmic cleft is a rarely diagnosed defect in the lamina of the lumbar spine. It has always been considered a congenital anomaly. This is the first report we are aware of showing radiological changes in a retroisthmic cleft over a period of time. The follow-up of this patient over a period of 6 years, the radiological and scintigraphic appearances and a review of the literature suggests that the retroisthmic cleft is a stress fracture of the lamina.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050586
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of human impact and bedrock differences on the vegetational history of the Insubrian Southern Alps (2000)
    Springer
    Vegetation history and archaeobotany 9 (2000), S. 175-187 
    Details
    ISSN: 1617-6278
    Keywords: Vegetation history ; Castanea sativa ; Juglans regia ; Ostrya carpinifolia ; Southern Alps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Archaeology , Biology
    Notes: Abstract Vegetation history for the study region is reconstructed on the basis of pollen, charcoal and AMS14C investigations of lake sediments from Lago del Segrino (calcareous bedrock) and Lago di Muzzano (siliceous bedrock). Late-glacial forests were characterised byBetula andPinus sylvestris. At the beginning of the Holocene they were replaced by temperate continental forest and shrub communities. A special type of temperate lowland forest, withAbies alba as the most important tree, was present in the period 8300 to 4500 B.P. Subsequently,Fagus, Quercus andAlnus glutinosa were the main forest components andA. alba ceased to be of importance.Castanea sativa andJuglans regia were probably introduced after forest clearance by fire during the first century A.D. On soils derived from siliceous bedrock,C. sativa was already dominant at ca. A.D. 200 (A.D. dates are in calendar years). In limestone areas, however,C. sativa failed to achieve a dominant role. After the introduction ofC. sativa, the main trees were initially oak (Quercus spp.) and later the walnut (Juglans regia). Ostrya carpinifolia became the dominant tree around Lago del Segrino only in the last 100–200 years though it had spread into the area at ca. 5000 cal. B.C. This recent expansion ofOstrya is confirmed at other sites and appears to be controlled by human disturbances involving especially clearance. It is argued that these forests should not be regarded as climax communities. It is suggested that under undisturbed succession they would develop into mixed deciduous forests consisting ofFraxinus excelsior, Tilia, Ulmus, Quercus andAcer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01299802
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  • 7
    Electronic Resource
    Electronic Resource
    Transparent barrier resins with high nitrile content (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 2567-2577 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The effect of 30-49 wt-% nitrile group content on the properties of copolymers is demonstrated. The nitrile is furnished by either acrylonitrile or methacrylonitrile. The exceptional resistance of such high nitrile content resins to the passage of gases and of solvents is shown and variations therein demonstrated for different comonomers. Transparent, tough, grafted polymers of good color are described which retain these properties. These qualities, combined with low second-order transition temperatures and adequate heat deflection temperatures, provide polymers of interest wherever containment and barrier are desired. Bottles, thermoformed containers, etc., could benefit from the use of some of the polymers described.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070131205
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