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  • 1
    Electronic Resource
    Electronic Resource
    Retention, absorption, translocation and distribution of sethoxydim in monocotyledonous and dicotyledonous plants (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 27 (1987), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Quackgrass [Elymus repens (L.) Gould =Agropyron repens (L.) Beauv.] and barnyardgrass [Echinochloa crus-galli (L.) Beauv.] were more than one hundred times more susceptible to sethoxydim than alfalfa (Medicago sativa L. 'Saranac') or navybean (Phaseolus vulgaris L. 'Seafarer'). Uptake of sethoxydim From soil following post-emergence applications caused negligible reduction in E. crus-galli fresh weight. More than 80% of foliar-applied 14C-sethoxydim was absorbed within 6 h in all species. Translocation occurred in all species with accumulation of 14C in rapidly growing plant tissues. Translocation to the roots was less than 8% of total in all species. Most of the extracted 14C initially partitioned into an ethyl acetate-soluble fraction. The proportion of 14C in the ethyl acetate-soluble fraction decreased with time with a concomitant increase of that in the insoluble fraction. Differences in the quantity of 14C in the ethyl acetate-soluble fraction did not account for the observed selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1987.tb00752.x
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  • 2
    Electronic Resource
    Electronic Resource
    Tritium Contamination of Deuterium Compounds (1973)
    [s.l.] : Nature Publishing Group
    Nature 241 (1973), S. 449-449 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Tritium Content of D20 Received from AEC Date nCiml.-1 ofD 20 September, 1969 6.0 November, 1969 6.0 April, 1970 6.0 April, 1970 0.06 May, 1970 0.12 July, 1970 0.09 September, 1970 0.06 September, 1970 0.09 November, 1970 0.1 December, 1970 0.27 January, 1971 0.02 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/241449a0
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  • 3
    Electronic Resource
    Electronic Resource
    Organochlorine residues in fish and fishery products from the Northwest Atlantic (1977)
    Springer
    Bulletin of environmental contamination and toxicology 18 (1977), S. 697-705 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The residues of polycholorinated biphenyls (PCBs) and DDT (p,p′-DDT and its metabolites) were determined in fish collected at various sites off the Atlantic Coast of Canada during 1971 and 1972. The results of analyses of 261 samples representing 29 species of Crustacea, bivalves and finfish, indicated widespread distribution of these contaminants and preferential accumulation in lipid rich specimens. Only fatty specimens of pelagic finfish consistently contained more than 0.1 μg/g of PCB and DDT. Bluefin tuna was the only species with residues frequently in excess of 1 μg/g. No appreciable differences were observed in residue levels of specimens taken during different years or in specimens taken at different sampling sites. A total of 83 samples representing 7 selected tissues and fishery products were also analyzed for PCB and DDT. No residues of lindane, aldrin, heptachlor, heptachlor epoxide and methoxychlor, and only very low levels of dieldrin and hexachlorobenzene were present in the 104 samples examined for these residues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01691981
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  • 4
    Electronic Resource
    Electronic Resource
    DDT residues in cod livers from the maritime provinces of Canada (1975)
    Springer
    Bulletin of environmental contamination and toxicology 14 (1975), S. 505-512 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The residues of DDT and its analogs were estimated in a number of cod liver samples (Gadus morhua) collected at six sampling sites off the Atlantic Coast of the Maritime Provinces of Canada during the summer of 1971. The residue levels indicated widespread distribution of DDT over the entire region sampled. Variations in the relative contributions of p, p′-DDE and p,p′-DDT to the total DDT residues (ΣDDT) were noted and the tendency for these residues to preferentially accumulate in lipid rich tissues was demonstrated. The residue levels found in cod livers were compared to the residue levels determined in cod flesh taken from some of the same specimens and also to residue levels in commercially refined cod liver oils. Samples of each of these types were stored at −29°C and analyzed in 1973 for DDT and PCB simultaneously. The ΣIDDT residues determined by both methods of analysis were compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705519
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  • 5
    Electronic Resource
    Electronic Resource
    Expression of the Neurospora crassa metallothionein gene in Escherichia coli and its effect on heavy-metal uptake (1995)
    Springer
    Applied microbiology and biotechnology 43 (1995), S. 1112-1117 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The gene coding for the Neurospora crassa metallothionein protein was chemically synthesized and cloned into the fusion expression vectors pMal-c and pMal-p. Cell-fractionation experiments demonstrated the proper localization of the pMal-c- and pMal-p- expressed proteins to the cytosol and periplasm of the bacteria respectively. Control bacteria as well as the recombinant bacteria producing the metallothionein protein were incubated with solutions of 109Cd at concentrations of 0.2 μM, 1 μM, and 10 μM. The recombinant bacteria were able to accumulate significantly more 109Cd than control bacteria at all concentrations tested. Cadmium accumulation was rapid and highly selective. Maximum uptake was achieved at a pH of 7.0, with lower accumulation at lower or higher pH values. The pH-dependent uptake of cadmium by the recombinant bacteria was exploited to strip off the bound cadmium from the recombinant bacteria and to regenerate most of the cadmium-binding sites. These observations suggest the potential for using a metallothionein-based biosorbent for certain heavy-metal removal applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166934
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  • 6
    Electronic Resource
    Electronic Resource
    Gastro-oesophageal reflux in halothane anaesthetized sheep. The effects of feeding and positioning (1988)
    Springer
    Veterinary research communications 12 (1988), S. 227-232 
    Details
    ISSN: 1573-7446
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The frequency of gastro-oesophageal reflux (GOR) in sheep anaesthetized with halothane was reduced by withholding food and water for 24 hours. The total reflux volume increased. The effect of body position on GOR was studied by inclining the operating table at angles to the horizontal and positioning the head up or down on sand bags. The operative positions investigated were: right and left lateral recumbency with head down, dorsal recumbency with head down and right lateral recumbency with head up. Least GOR occurred when the sheep was in right lateral recumbency with a head up tilt and the body inclined at 20° from the horizontal. A cuffed oesophageal drainage tube increased the incidence of GOR but prevented the chances of the aspiration of rumen material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00362804
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  • 7
    Electronic Resource
    Electronic Resource
    Motility of the oesophagus and gastro-oesophageal junction during halothane anaesthesia in sheep (1988)
    Springer
    Veterinary research communications 12 (1988), S. 417-430 
    Details
    ISSN: 1573-7446
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electromanometry and electromyography were used to study gastro-oesophageal motility in two planes of halothane anaesthesia in sheep. Gastro-oesophageal motility when present was greater in light than in deep anaesthesia. The caudal thoracic oesophagus contracted more frequently and for longer than the rostral thoracic oesophagus. In light anaesthesia oesophageal movements were peristaltic in direction with a propagation velocity of 26–29 cm sec-1. Rumen pressures increased throughout anaesthesia and the rate of increase was greatest when the plane of anaesthesia was deep at the start. Gastro-oesophageal reflux (GOR) occurred in both planes of anaesthesia and must occur by passive mechanisms during deep anaesthesia because gastro-oesophageal motility was inhibited. A high pressure zone (HPZ) was demonstrated for a length of 2.9 cm at the gastro-oesophageal junction with a balloon-tipped catheter and a ‘pull through’ technique. Open-tipped catheters could detect the HPZ but were less sensitive. The pressure in the HPZ was not significantly influenced by the depth of anaesthesia used. In 80% of cases of light anaesthesia an increase in HPZ pressure preceeded the contraction of the cranial sac of the rumen. In deep anaesthesia the HPZ continued to have rhythmic changes in tone. Spontaneous GOR coincided with a maximum gastro-oesophageal pressure gradient in 24% of cases. Rumen insufflation with oxygen provoked GOR at a rumen pressure above 33 mmHg compared with 7.2 mmHg during spontaneous reflux. The study demonstrates that a gastro-oesophageal pressure gradient was not primarily responsible for the initiation of GOR during anaesthesia and that the HPZ at the gastro-oesophageal junction of sheep had some of the properties of a lower oesophageal sphincter and played an important role in the initiation of GOR during anaesthesia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343262
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  • 8
    Electronic Resource
    Electronic Resource
    Methodology for simultaneous optimization with reliability: Nuclear PWR example (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 1050-1055 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220615
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  • 9
    Electronic Resource
    Electronic Resource
    Elementaranalyse (1936)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 107 (1936), S. 52-68 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388223
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  • 10
    Electronic Resource
    Electronic Resource
    Poly(Phenylene oxide)/polyamide blends via reactive extrusion (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 1056-1062 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Reactive extrusion of functionalized polymers provides a convenient, commercially attractive route for the preparation of copolymers useful in compatibilization of polymer blends. In the current study, the grafting chemistry of maleic anhydride to poly(phenylene oxide) in the absence of a radical initiator is contrasted to that of efficient quinone-methide trapping agents such as maleimides. In the case of maleic anhydride, functionalization is shown to occur randomly along the polymer backbone whereas maleimides react to give both main chain and end-group derivatives. Use of this anhydride-functionalized polyfphenylene oxide and an end-group functionalized analog in blends with polyamide-6,6 affords high levels of graft and diblock copolymers respectively, sufficient for the preparation of highly ductile materials. The properties of these polyamide blends are found to depend on the amount of copolymer formed during extrusion with final copolymer levels being in turn returned to the degree of anhydride functionalization. The properties and morphology of blends containing graft or diblock copolymers derived from main-chain and end-group functionality respectively, are rationalized in terms of the relative effectiveness of different copolymer structures in blend compatibilization.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301709
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