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  • 1980-1984  (10)
  • 1975-1979
  • 1984  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Partition of amphiphilic molecules into phospholipid vesicles and human erythrocyte ghosts: measurements by ultraviolet difference spectroscopy (1984)
    s.l. : American Chemical Society
    Biochemistry 23 (1984), S. 6086-6091 
    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/bi00320a028
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic Parameters of Gaseous Detonations (1984)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 16 (1984), S. 311-336 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.16.010184.001523
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  • 3
    Electronic Resource
    Electronic Resource
    Human epidermal growth factor receptor cDNA sequence and aberrant expression of the amplified gene in A431 epidermoid carcinoma cells (1984)
    [s.l.] : Nature Publishing Group
    Nature 309 (1984), S. 418-425 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The complete 1,210-amino acid sequence of the human epidermal growth factor (EGF) receptor precursor, deduced from cDNA clones derived from placental and A431 carcinoma cells, reveals close similarity between the entire predicted ν-erb-B mRNA oncogene product and the receptor transmembrane and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/309418a0
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of host cell extracts on cultures of endosymbiotic diatoms from larger foraminifera (1984)
    Springer
    Marine biology 82 (1984), S. 113-120 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Log phase endosymbiotic diatom species, Nitzschia valdestriata, N. laevis, N. panduriformis var. continua, N. frustulum var. subsalina and var. symbiotica, Amphora tenerima, Fragilaria shiloi and Navicula hanseniana, were aseptically exposed to an homogenate of freshly crushed foraminiferal host species (Amphistegina). To various degrees, depending upon endosymbiont species, the host homogenate affected the formation of new frustules of growing and dividing cells. F. shiloi was the most affected species. New cells were spheroids and had only vestiges of frustules or none at all. Fewer numbers of the other species tested (40 to 60%) were abnormal. The raphe and keel of affected Nitzschia spp. were usually curved and incomplete. Many cells were spherical. We infer that “host substances” are probably responsible for the maintenance of the frustule-less state in vivo and that if ingested potential endosymbionts escape digestion, they could become frustule-less after growth and cell division. Host homogenate also increased the levels of photosynthetate released by diatoms to their medium. N. valdestriata was stimulated to release 76% of its photosynthetate while other species tested were stimulated to release between one quarter to one half of their photosynthetate. Host homogenate was also effective in causing the release of 43% of the photosynthetate of a free-living diatom, Amphora sp., which was also tested in the experiment. The concentration of the metabolites released in the experiment was too low for us to identify by TLC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394095
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of aluminium and micro-nutrients on the sorption of phosphorus byTrifolium repens L. cv. ‘Grasslands Huia’ from nutrient solutions during plant induced pH changes (1984)
    Springer
    Plant and soil 81 (1984), S. 389-402 
    Details
    ISSN: 1573-5036
    Keywords: Absorption ; Aluminium ; Boron ; Copper ; Factorial design ; Iron ; Manganese ; Nutrient solutions ; pH ; Phosphorus uptake ; Zinc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The sorption of phosphorus from nutrient solution and the pH change in the nutrient solution were monitored over a 24 hour period forTrifolium repens L. cv. ‘Grasslands Huia’ plants. Two different concentration levels of micro-nutrients (B, Cu, Fe, Mn and Zn) and Al formed the factors of a fractional replicate of a 26 factorial design. Measurements were made at four time intervals (30 minutes after the plants were placed on the pots, 3 hours, 6 hours and 24 hours later). In addition to phosphorus, fourteen other nutrients (including nitrate and ammonium) were monitored throughout the experiment. The sorption of phosphorus was significantly influenced by both aluminium and iron. The effect of aluminium and iron on phosphorus sorption is attributed to physico-chemical sorption processes involving the root surface. However the effect on the removal of phosphorus by boron, copper, manganese and zinc was observed only as first order interaction effects —B−Zn, Cu−Zn, Mn−Zn. Thus these three elements (B, Cu and Mn) only affect phosphorus removal in conjunction with zinc. Aluminium and iron together had a separate but very significant effect on the removal of phosphorus at most periods throughout the experiment. In contrast, pH was affected only by aluminium, iron (the pH drop was enhanced) and manganese (the pH drop was decreased) as main effects independent of the other treatment elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02323053
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  • 6
    Electronic Resource
    Electronic Resource
    Aluminium toxicity expression nutrient uptake, growth and root morphology ofTrifolium repens L. cv. ‘Grasslands Huia’ (1984)
    Springer
    Plant and soil 82 (1984), S. 101-116 
    Details
    ISSN: 1573-5036
    Keywords: Aluminium toxicity ; Calcium ; Phosphate ; Trifolium ; Uptake ; Nutrients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Hydroponic experiments were undertaken to examine the effect of increasing aluminium levels on the mineral nutrition and root morphology ofT. repens growing in nutrient solution. Toxicity symptoms appear between 27.8 and 47.5 μM Al3+ activity (148 to 297 μM total aluminium). The threshold level corresponding to a 10% reduction in leaf fresh weight is estimated to be approximately 20 μM Al3+ activity. The concentration of aluminium in the leaves of white clover increases exponentially with aluminium activity in the nutrient solution. The uptake of divalent cations was inhibited but aluminium enhanced potassium and nitrogen concentrations in both leaves and roots. At high pH (pH 6.0) the speciation of aluminium is controlled by the formation of solid aluminium phosphate and aluminium hydroxide except at the lowest aluminium level (37 μM) where 99.9 per cent is present as the DTPA complex. As the concentration of total aluminium increases, the percentage of Al-DTPA and soluble aluminium hydroxide decreases whilst solid Al(OH)3 increases rapidly to reach a maximum of 91.6 percent (of the total aluminium) in the 1180 μM aluminium treatment. At pH 4.5 the dominant forms of aluminium are free aluminium ion Al-DTPA, AlSO 4 + and AlOH2+. The roots of aluminium stressed plants showed symptoms typical of aluminium toxicity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220774
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  • 7
    Electronic Resource
    Electronic Resource
    The mixing and axial transport of smoke in oscillatory tube flows (1984)
    Springer
    Annals of biomedical engineering 12 (1984), S. 371-383 
    Details
    ISSN: 1573-9686
    Keywords: Oscillatory flows ; Mixing ; Transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract To gain a better insight on the mechanisms of transport in high-frequency ventilation, we examined the transport of smoke in a straight tube, a model of the trachea. A smoke bolus was injected into a ventilator, and the movement of the smoke along the tube was monitored by a laser-photomultiplier system. With this system we studied the instantaneous movement of the smoke cycle by cycle and that over a longer period. From the latter, a transport coefficient can be calculated to characterize how fast the smoke is transported along the tube. We found that for low frequency, the flow is laminar with a transport coefficient smaller or approximately 700 cm2/s. For very high frequencies, the oscillatory flow becomes turbulent and effects a strong radial and axial mixing. The transport coefficient increases to as high as 5,000 cm2/s. Over a certain intermediate range of the frequency, the mixing can be a laminar one over several cycles of oscillation and a turbulent one for some subsequent cycles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407781
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  • 8
    Electronic Resource
    Electronic Resource
    The glutaraldehyde-stabilized porcine aortic valve xenograft. I. Tensile viscoelastic properties of the fresh leaflet material (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 61-77 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The tensile viscoelastic properties of radial and circumferential strips of fresh porcine aortic valve leaflets have been examined and compared with the fiber architecture of the leaflets as seen in the scannng electron microscope. The leaflet material showed nonlinear viscoelasticity, largely independent of strain rate, and dependent on the degree of preconditioning by cyclic loading. Preconditioning to a stable stress-strain response could only be accomplished on 1-cm-long strips above a minimum width of 4 mm (circumferential) and 6 mm (radial). Preconditioning yielded a more elastic and extensible material with reduced hysteresis. The leaflets were markedly anisotropic. Circumferential strips were up to 8 times stronger and stiffer than radial strips, and displayed greater stress relaxation and less creep. The circumferential mechanical properties were due to well-aligned circumferential collagen bundles reinforcing the composite structure, while radial properties were due to a more random collagenous support throughout the leaflet. Despite the presence of a septal shelf on the right coronary leaflet, no mechanical differences could be discerned between leaflets.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180108
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  • 9
    Electronic Resource
    Electronic Resource
    The glutaraldehyde-stabilized porcine aortic valve xenograft. II. Effect of fixation with or without pressure on the tensile viscoelastic properties of the leaflet material (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 79-98 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: We have examined the tensile viscoelastic properties of circumferential and radial strips of porcine aortic valve leaflets following fixation in glutaraldehyde and formaldehyde, with or without pressure. After aldehyde treatment, the radial strips remained weaker and less stiff than circumferential strips and responded slightly differently to the treatment. After fixation, with or without pressure, the radial strips showed large changes in stress-strain and hysteresis responses due to initial loading, and there was a twofold reduction in tensile strength and final stiffness. For strips in both directions, fixation without pressure produced doubled extensibility and a ramping stress-strain curve. Permanent (plastic) deformation of 5-20% occurred as a result of cyclic loading, stress relaxation, and creep experiments. Pressure fixation, however, produced little change in stress-strain results other than a simple shift to lower strain and produced no plasticity. Both methods of fixation reduced stress relaxation and creep. Mechanical test results are consistent with a loss of ground substance matrix during fixation. Reductions in tensile strength after fixation may be due to “riveting” of collagen geometry, producing local stress concentrations.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180109
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  • 10
    Electronic Resource
    Electronic Resource
    Scanning cytophotometric analysis of myocardial nucleic acid and chromatin changes in soman toxicated rabbits (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 2 (1984), S. 237-242 
    Details
    ISSN: 0263-6484
    Keywords: Heart ; Feulgen-DNA ; Azure B-RNA ; microdensitometry ; soman toxicity ; cardiac muscle ; cytochemistry ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Myocardial nucleic acid responses were analysed in New Zealand White rabbits 20 min-1 h and 6-8 h following single subcutaneous injections of soman (20, 30, or 40 μg kg-1). Scanning-integrating microdensitometry was used to quantify Azure B-RNA and Feulgen-DNA (F-DNA) levels, and changes in the suseptibility of chromatin to Feulgen acid hydrolysis (F-DNA reactivity) of individual ventricular myocardial cells. With a dosage of 20 μg kg-1 soman, no RNA alterations were evidenced at 1 h whereas at 6-8 h myocardial cells exhibited higher RNA levels and an increase in F-DNA reactivity of chromatin. With dosages of 30 and 40 μg kg-1 soman there was an augmentation in RNA levels and in the acid hydrolysability of nuclear chromatin at both 20 min-1 h and 6-8 h. It is postulated that the observed cellular transformations represent a compensatory augmentation in myocardial metabolic functioning presumably in response to an increased functional demand on the ventricular myocardium. The absence of cytopathic or cytochemical evidence of impairment in nucleic acid metabolism is inconsistent with the premise that soman exerts direct cytotoxic effects on rabbit myocardium.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290020410
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