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  • 1
    Electronic Resource
    Electronic Resource
    Germination of cocklebur seed and growth of their axial and cotyledonary tissues in response to C2H4, CO2 and/or O2 under water stress (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 12 (1989), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Germination modes of lower seeds of cocklebur (Xanthium pennsylvanicum Wallr.) under different water stresses, prepared with mannitol solution, were examined in relation to gaseous factors. As the concentration of mannitol increased, germination was increasingly inhibited at a mode which was drawn by two straight lines having different slopes and meeting at an angle. One is a sharp line occurring at the lower concentrations of mannitol; the other is a gentle line occurring at higher concentrations of mannitol. The former reflected the growth response of axial tissues to mild water stress, whereas the latter reflected the growth response of cotyledonary tissues to severe water stress. The germination potential of cocklebur seeds increased with increasing temperature. Thus, the seeds were more resistant to water stress at higher than al lower temperatures. This increased germination potential under water stress resulted from the greater growth potential of axial tissues, but not cotyledonary tissues, at higher temperature. Increased O2 levels improved both the reduced axial and cotyledonary growth under water stress. Carbon dioxide predominantly enhanced axial growth under water stress, whereas C2H4 exclusively enhanced cotyledonary growth. Thus, these gases were effective in potentiating germination under water stress. When combined with each other, these gases caused more pronounced growth of the axial and cotyledonary tissues, leading to germination under more severe water stresses. Maximal axial and cotyledonary growth under water stress occurred in the simultaneous presence of CO2, C2H4 and O2, which allowed the germination at higher mannitol concentrations above 0.6 kmol m−3 From these results, it was suggested that cocklebur seeds would override water stress by depending upon both the Corresponding axial growth and the C2H4-responding cotyledonary growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01931.x
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  • 2
    Electronic Resource
    Electronic Resource
    Separtation of metal tetrakis(p-tolyl)porphine complexes by reversed-phase high-performance liquid chromatography (1985)
    Springer
    Chromatographia 20 (1985), S. 72-74 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Metal complexes ; Tetrakis(4-methylphenyl)porphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The feasibility of reversed-phase high-performance liquid chromatography for the separation of several metal complexes ofmeso-tetrakis(p-tolyl)porphine (TTP) is described. A combination of an octadecyl-bonded stationary phase with a non-aqueous polar mobile phase, such as an acetone-acetonitrile mixture, has proved effective for the separation. Thus, the TTP complexes of Mg, VO, Ni, Cu, Zn, and Pd and also TTP free acid were successfully separated in about 10min on a Li-Chrosorb RP-18 column (7μm, 250×4mm i.d.) with a 70∶30 (vol/vol) mixture of acetone and acetonitrile at a flow-rate of 1 mlmin−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280599
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  • 3
    Electronic Resource
    Electronic Resource
    High-performance thin-layer chromatography of etioporphyrin and its vanadium (IV), nickel (II) and coper (II) complexes (1985)
    Springer
    Chromatographia 20 (1985), S. 417-420 
    Details
    ISSN: 1612-1112
    Keywords: High-Performance TLC ; Metal complexes ; Etioporphyrin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The RF values were obtained for etioporphyrin I (H2Etio) and its vanadyl, nickel and copper complexes on cellulose, silica gel, and octyl-bonded silica HPTLC plates, with various organic solvents. The mobility of these compounds tends to increase in the following order: (1) on cellulose, VOEtio 〈 H2Etio 〈 CuEtio ≤ NiEtio; (2) on silica gel, H2Etio 〈 VOEtio 〈 NiEtio ≤ CuEtio; (3) on octyl-bonded silica, CuEtio 〈 NiEtio 〈 VOEtio and the apparent mobility of H2Etio relative to metal-Etio complexes depends on the developing solvent used. Complete separation of these four Etio compounds can be accomplished on an octyl-bonded silica plate with either methanol or acetone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02265483
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  • 4
    Electronic Resource
    Electronic Resource
    Non-aqueous, reversed-phase, high-performance, thin-layer chromatography and column liquid chromatography of metal complexes of porphine (1986)
    Springer
    Chromatographia 22 (1986), S. 160-164 
    Details
    ISSN: 1612-1112
    Keywords: Thin layer chromatography ; Column liquid chromatography ; 21H, 23H-Porphine ; Metalloporphyrin complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chromatographic mobility of 21H, 23H-porphine and its Ni(II), Cu(II), Zn(II) and Pd(II) complexes were investigated by high-performance thin-layer chromatography on an octadecyl-bonded, silica gel plate with various polar organic solvents including alcohols, acetonitrile, dimethylsulfoxide and propylenecarbonate. The mobility generally decreases according to the central metal ion of the complex as follows: Zn(II)〉(free porphine)〉Ni(II)〉Pd(II)〉Cu(II). Methanol is a good choice of solvent for the separation of these metal porphine complexes. Successful separation of porphine and the four metal complexes is accomplished within 13 min on a LiChrosorb RP-18 column with methanol eluent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257319
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  • 5
    Electronic Resource
    Electronic Resource
    Reversed-phase high-performance thin-layer chromatography of hematoporphyrin and its nickel, copper and zinc complexes (1986)
    Springer
    Chromatographia 21 (1986), S. 509-512 
    Details
    ISSN: 1612-1112
    Keywords: Thin-layer chromatography ; Porphyrin ; Metalloporphyrins ; Hematoporphyrin IX
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The thin-layer chromatographic mobility of hematoporphyrin IX (Hp) and its metal complexes on octyl (C8)- or octadecyl (C18)-bonded silica gel plate is described. The mobility order for those compounds is regular on both kinds of plate with various compositions of methanol-phosphate buffer mixtures as the developing solvents; thus, Cu-complex 〈 Ni-complex 〈 Hp (free acid) 〈 Zn-complex. The combination of a C18-plate with an 85∶15 (vol/vol) mixture of methanol and phosphate buffer (pH 3) is recommended for the successful separation of these four compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02310537
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  • 6
    Electronic Resource
    Electronic Resource
    Reversed-phase, high-performance, thin-layer chromatography of metal tetrakis (p-tolyl) porphine complexes on octadecylbonded stationary phase (1985)
    Springer
    Chromatographia 20 (1985), S. 49-52 
    Details
    ISSN: 1612-1112
    Keywords: High-performance TLC ; Metal complexes ; Tetrakis (4-methylphenyl) porphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The metal complexes ofmeso-tetrakis (p-tolyl) porphine (TTP) are chromatographed on octadecyl-bonded silica gel thin-layer with various organic solvents of relatively high polarity used as the eluent. The mobility of the metal-TTP complex depends on its centralmetal, increasing in the order of Cu(II)〈Pd(II)≈NI(II)〈TTP free acid〈V(IV) as vanadyl〈Zn(II)〈Mg(II), although some irregularities are found with the different developing solvents used. The concept of Hildebrand's solubility parameter is applied to the discussion of the mobility of each compound, on the solvents used as the developer. Successful separation of the TTP compounds is performed by using a mixture of acetone and acetonitrile as the developer, although the Ni- and Pd-complexes are not completely resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02260487
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  • 7
    Electronic Resource
    Electronic Resource
    Specific retention behaviour of metal (III) tetraphenylporphyrins in non-aqueous, reversed high-performance liquid chromatography (1986)
    Springer
    Chromatographia 22 (1986), S. 43-47 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Metalloporphyrins ; 5,10,15,20-Tetraphenylporphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The Co(II), Ni(II), Fe(III) and V(IV) complexes of tetraphenylporphine (TPP) can be eluted at short retention times from a LiChrosorb RP-18 column with pure ethanol. However, both Mn(III) and Co(III) complexes of metal TPP chloride type are so strongly retained on the column that they cannot be eluted. While the retention of other metal teraphenylporphine complexes was not affected, that of the metal(III) complexes of the TPP chloride type especially MnTPPCl and CoTPPCl, decreases dramatically with an increase in the concentration of NH4Cl added into the mobile phase; a linear relationship between logk' and log[NH4Cl], with the slope of about−1, has been observed for these two metal(III) complexes in the NH4Cl concentration range from 2.5×10−4 to 1.3×10−2 mol/l. Thus, the specific control of the retention of the metal(III) complexes is enabled by conditioning the NH4Cl content of the mobile phase, and the chromatographic separation is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257295
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  • 8
    Electronic Resource
    Electronic Resource
    High-performance liquid chromatographic separation of hematoporphyrin and its nickel, copper and zinc complexes on octadecyl-bonded stationary phase (1986)
    Springer
    Chromatographia 22 (1986), S. 132-134 
    Details
    ISSN: 1612-1112
    Keywords: Column liquid chromatography ; Porphyrin ; Metalloporphyrin ; Hematoporphyrin IX
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The feasibility of reversed-phase high-performance liquid chromatography for the separation of metal complexes of hematoporphyrin IX (Hp) is described. The retention order, Zn-complex〈Hp (free acid)〈 Ni-complex〈Cu-complex, is regular on an octadecylbonded stationary phase with different compositions of an aqueous methanol mobile phase. These four compounds can be successfully separated within about 8 min on a LiChrosorb RP-18 column (250×4-mm i.d.) with a 85:15 (vol/vol) mixture of methanol and phosphate buffer (pH 3) at a flow rate of 1 ml/min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02257313
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