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  • 1
    Electronic Resource
    Electronic Resource
    Effect of inorganic nitrogen nutrition on cytokinin-induced potato microtuber production in vitro (1998)
    Springer
    Potato research 41 (1998), S. 211-217 
    Details
    ISSN: 1871-4528
    Keywords: in vitro tuberization ; micropropagation ; mineral nutrition ; seed potato production ; Solanum tuberosum L. ; tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of inorganic nitrogen nutrition on the induction and development of microtubers by cytokinin-induced tuberization was studied in four potato genotypes belonging to different maturity groups. The objective of this study was to investigate whether a reduction in total nitrogen level in the Murashige & Skoog medium would improve cytokinin-induced tuberization rate. The effect of three levels of total nitrogen (15, 30 and 45 meq) on tuberization was studied at constant (20 meq K) and varying potassium levels approximating to 5, 10 and 15 meq. Reducing the total nitrogen supply increased the number but decreased the size of nitrogen level on the rate of assimilate partitioning (harvest index) during cytokinin-induced microtuberization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358191
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  • 2
    Electronic Resource
    Electronic Resource
    Phloroglucinol enhances growth and rate of axillary shoot proliferation in potato shoot tip cultures in vitro (2000)
    Springer
    Plant cell, tissue and organ culture 60 (2000), S. 139-149 
    Details
    ISSN: 1573-5044
    Keywords: 1 ; 3 ; 5-benzenetriol ; Dilospan S ; meristem culture ; micropropagation ; phenolic compound ; phloroglucinol ; Solanum tuberosum L. ; 1 ; 3 ; 5-trihydroxybenzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Efficacy of phloroglucinol in promoting growth and development of in vitro-derived shoot tips was studied in six potato (Solanum tuberosum L.) genotypes. Different concentrations of phloroglucinol (0, 0.08, 0.4, 0.8, 1.2 and 1.6 mM) were tested in combination with either 0.1 or 0.2 M sucrose in shoot tip proliferation medium based on MS (Murashige and Skoog, 1962) medium supplemented with 5.8 μM GA3 (gibberellic acid), 1.1 μM BA (N6-benzyladenine) and 8.39 μM D-calcium pantothenate. Phloroglucinol fostered multiple shoot formation, promoted axillary shoot proliferation in terms of shoot tip fresh weight and shoot length, and stimulated root formation on the shoot tips. There was significant phloroglucinol × sucrose interaction for number of shoots developed per shoot tip, shoot tip fresh weight and number of roots induced per shoot tip. The beneficial effect of phloroglucinol on shoot tip survival was conspicuous only in genotypes that showed poor survival in the control proliferation medium. There were significant differences in response between the two sucrose levels with regard to shoot tip fresh weight and number of roots per shoot tip. Phloroglucinol in combination with 0.2 M sucrose induced maximum number of roots per shoot tip. Optimum shoot tip growth was fostered in medium containing 0.8 mM phloroglucinol and 0.2 M sucrose. High frequency multiple shoot formation in this medium ensures a faster rate of potato shoot tip multiplication within a limited time and space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006419805980
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  • 3
    Electronic Resource
    Electronic Resource
    Factors affecting minimal growth conservation of potato microplants in vitro (1998)
    Springer
    Euphytica 102 (1998), S. 275-280 
    Details
    ISSN: 1573-5060
    Keywords: Germplasm conservation ; in vitro conservation ; minimal growth ; slow growth ; Solanum tuberosum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Combined effects of sucrose, mannitol and photoperiod on microplant conservation were studied in four potato genotypes belonging to two different groups viz., Tuberosum and Andigena. Minimal growth medium was based on Murashige and Skoog (MS) supplemented with 6 different concentrations of sucrose (30, 40, 50, 60, 70 and 80 gl-1) with 4 different concentrations of mannitol (0, 20, 40 and 60 gl-1). The cultures were conserved under two photoperiod conditions i.e. continuous illumination and 16-h photoperiod at 6 ± 1 °C. There were significant interactions between photoperiod and sucrose, and between photoperiod and mannitol. Maximum microplant survival and desirable microplant growth were observed under 16-h photoperiod. Sucrose alone did not improve culture viability over 30 months of storage. Inclusion of mannitol in the conservation medium increased microplant survival. Sucrose x mannitol interaction showed that sucrose was effective in enhancing microplant survival in combination with 20 or 40 gl-1 mannitol, but not with 60 gl-1 mannitol. Combined effect of sucrose, mannitol and photoperiod showed that optimum microplant growth and maximum culture viability were obtained when the cultures were grown in MS medium containing 40 gl-1 sucrose and 20 gl-1 mannitol under 16-h photoperiod. Potato microplants can be conserved in this medium and cultural conditions up to 30 months without subculturing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018309300121
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  • 4
    Electronic Resource
    Electronic Resource
    Preferred phosphodiester conformations in nucleic acids. A virtual bond torsion potential to estimate lone-pair interactions in a phosphodiester (1980)
    New York : Wiley-Blackwell
    Biopolymers 19 (1980), S. 165-171 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The lone-pair orbital interactions arising in a phosphodiester are incorporated into semiempirical conformational energy calculations using a unifold “torsional potential” around the virtual bond linking the ester oxygen atoms. The results explain the observed experimental data better than other methods.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1980.360190111
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and in vitro analysis of microencapsulated genetically engineered E. coli DH5 cells for urea and ammonia removal (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 46 (1995), S. 621-626 
    Details
    ISSN: 0006-3592
    Keywords: microencapsulation ; urea ; ammonia ; alginate-poly-L-lysine-alginate (APA) ; artificial cells ; mechanical strength ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This article describes a novel method of urea and ammonia removal using microencapsulated, genetically engineered Escherichia coli DH5 cells. Optimization of bacterial cell encapsulation was carried out. The optimal method consists of alginate 2.00% (w/v) at a flow rate of 0.0724 mL/min and a coaxial air flow rate of 2.00 L/min. This produces spherical, alginate-poly-L-lysine-alginate (APA) microcapsules of an average 500 ± 45 μm diameter. Increasing the concentration of alginate from 1.00% to 1.75% improves the quality of the microcapsules, while cell viability remains unaffected. The APA microcapsules are mechanically stable up to 210-rpm agitation with no bacterial cell leakage. The in vitro performance of urea and ammonia removal by encapsulated bacteria is assessed. One hundred milligrams of bacterial cells in APA microcapsules, in their log phase state of growth, can lower 87.89 ± 2.25% of the plasma urea within 20 min and 99.99% in 30 min. The same amount of encapsulated bacteria can also lower ammonia from 975.14 ± 70.15 μM/L to 81.151 ± 7.37 μM/L in 30 min. There are no significant differences in depletion profiles by free and encapsulated bacteria for urea and ammonia removal. This novel approach using microencapsulated, genetically engineered E. coli cells is significantly more efficient than presently available methods of urea and ammonia removal. For instance, it is 30 times more efficient than the standard urease-ammonium adsorbent system. © 1995 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260460615
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  • 6
    Electronic Resource
    Electronic Resource
    Bromide Alkoxides of Tantalum (1967)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 36 (1967), S. 24-28 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of tantalum pentaalkoxides (ethoxide, isopropoxide and tertiarybutoxide with acetyl bromide give the products: Ta(OEt)4Br; Ta(OEt)3Br2; Ta(OEt)2Br3 · MeCO2Et; Ta(OEt)Br4 · MeCO2Et; Ta(OPr1)4Br; Ta(OPr1)3Br2; Ta(OPr1)2Br3 · MeCO2Pr1; TaOBr3. MeCo2Pr1; Ta(OBut)4Br and TaOBr3 · MeCO2But. These products were found to be viscous liquids or solids. All these bromide alkoxides except the tertiarybutoxide derivatives were found to be soluble in benzene. The tetraalkoxide monobromide derivatives could either be distilled or sublimed unchanged under reduced pressure. The tetraalkoxide monobromide derivative was found to be dimeric in boiling benzene.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19670360104
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  • 7
    Electronic Resource
    Electronic Resource
    The kinetics of the interaction of peroxy radicals. I. The Tertiary Peroxy RadicalsThis work has been sponsored by Grants from the National Science Foundation (CHE-76-16787A02) and U.S. Army Research Office (No. DAAG29-76-G0195) (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 12 (1980), S. 29-42 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Existing data on the self-reactions of tertiary peroxy radicals RO2 has been reanalyzed and corrected to deduce Arrhenius parameters for both termination and nontermination paths. For R = t-Butyl, these are logkt(M-1sec-1) = 7.1 - (7.0/θ) and logknt(M-1sec-1) = 9.4 - (9.0/θ), respectively, different from those recommended by other authors. The higher magnitudes observed for termination processes of tertiary peroxy radicals like those of cumyl and 1,1-diphenylethyl have been discussed in terms of a much greater cage recombination of cumyloxy radicals as contrasted with t-butoxy radicals. It is shown that for benzyl peroxy radicals, the R - O·2 bond dissociation energy is sufficiently low (18-20 kcal) that reversible dissociation into R· + O2 opens a competing second-order path to fast recombination R· + RO·22 → ROOR. This path is probably not important for cumyl peroxy radicals under usual experimental conditions but can become important for 1,1-diphenyl ethyl peroxy radicals at (O2) 〈 10-3M. At very low RO·2 concentrations (〈10-5M), in the absence of added O2, an apparent first-order disappearance of RO·2 can occur reflecting the rate determining breaking of the cumyl - O·2 bond followed by the second step above. The thermochemistry of RO·n is used to show that the reaction of R2O4 → 2RO + O2 must be concerted and cannot proceed via RO·3 which is too unstable and cannot form even from RO· + O2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550120104
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  • 8
    Electronic Resource
    Electronic Resource
    The kinetics of the interaction of peroxy radicals. II. Primary and secondary alkyl peroxyThis work has been sponsored by Grants from the National Science Foundation (CHE-76-16787A02) U.S. Army Research Office (No. DAAG29-76-G0195) (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 12 (1980), S. 43-53 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A chain mechanism is proposed to account for the very rapid termination reactions observed between alkyl peroxy radicals containing α-C - H bonds which are from 104 to 106 faster than the termination of tertiary alkyl peroxy radicals. The new mechanism is with termination by. \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R}\overline {{\rm CHOO}} $\end{document} is the zwitterion originally postulated by Criegee to account for the chemistry of O3-olefin addition. Heats of formation are estimated for \documentclass{article}\pagestyle{empty}\begin{document}$ \overline {{\rm CH}_2 {\rm OO,}} {\rm }\overline {{\rm RCHOO}} $\end{document}, and \documentclass{article}\pagestyle{empty}\begin{document}$ ({\rm C}\overline {{\rm H}_3 )_2 {\rm COO}} $\end{document} and it is shown that all steps in the mechanism are exothermic. The second step can account for (1Δ)O2 which has been observed. k1 is estimated to be 109-2/θ liter/M sec where θ = 2.303RT in kcal/mole. The second and third steps constitute a chain termination process where chain length is estimated at from 2 to 10. This mechanism for the first time accounts for minor products such as acid and ROOH found in termination reactions. Trioxide (step 3) is shown to be important below 30°C or in very short time observations (〈10 s at 30°C). Solvent effects are also shown to be compatible with the new mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550120105
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  • 9
    Electronic Resource
    Electronic Resource
    Liquid-phase oxidation of isobutane - a reanalysis of the data (1980)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 12 (1980), S. 169-181 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Data on the liquid-phase oxidation of isobutane at 50 and 100°C have been reexamined, using a modified mechanism to take into account the termination by isobutylperoxy radicals. Algebraic expressions are derived from steady-state methods. Using Arrhenius parameters fitted by transition-state A factors and activation energies derived from observed “best” rate constants, new sets of parameters are derived for the rate constants for propagation by t—BuO2 + t—BuH → t-BuO2H + t—Bu⋅: \documentclass{article}\pagestyle{empty}\begin{document}$$ k_4 \, = \,1 \times 10^{8 - 14.5/{\rm \theta }} {\rm M}^{{\rm - 1}} \sec ^{ - 1} $$\end{document} where θ = 2.303RT in kcal/mol. This, together with new values for the termination parameters and rates of i-butyl production by k4B, is shown to give good agreement with the published data. An important reaction:\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm R}'{\rm O}_{2}^{.} + {\rm RO}_{2} {\rm H}\mathop{{\buildrel{-\!\!\longrightarrow}\over{\longleftarrow}}}\limits^{{\rm 12}}{\rm R'O}_{\rm 2} {\rm H} + {\rm RO}_{2}^{.} $$\end{document} is shown to quench the possible contributions to termination of adventitious radicals such as CH3O⋅2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550120304
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  • 10
    Electronic Resource
    Electronic Resource
    Organic compounds of niobium and tantalum. Reactions of niobium and tantalum pentaethoxides with glycols (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 351 (1967), S. 219-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neue Niob- und Tantalverbindungen der Typen (EtO)3M(glycol), (EtO)M(glycol)2 und M(glycol)3 wurden aus den Pentaäthoxiden und verschiedenen Glykolen (z. B. Butan-1.3-diol) hergestellt. Sofern in Benzol löslich, sind die Verbindungen darin dimer.
    Notes: Following three types of new compounds (EtO)3M(glycol), (EtO)M(glycol)2 and M(glycol)3 (where M is niobium or tantalum) were isolated by the reactions of niobium and tantalum pentaethoxides with various glycols (butane-1.3-diol, neopentyl glycol and hexane-1.6-diol). Molecular weights of the few soluble compounds show that they are dimeric in benzene.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19673510312
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