Deuterated ethylene was used to study the mechanism of ethylene action in etiolated pea seedlings (Pisum sativum L. cv. Alaska). No apparent differences were observed in the biological activity of tetradeuteroethylene (C(2)D(4)) and ordinary ethylene (C(2)H(4)) using the pea stem straight growth assay. The absence of an isotopic effect is discussed in relation to the possibility that ethylene b...

A. U. B. Wolter, R. Feyerherm, E. Dudzik, S. Süllow, Ch. Strack, M. Lang, D. Schweitzer Institut für Physik der Kondensierten Materie, TU Braunschweig, 38106 Braunschweig, Germany Hahn–Meitner–Institut GmbH, c/o BESSY, 12489 Berlin, Germany Physikalisches Institut, J.W. Goethe Universität, FOR412, 60438 Frankfurt am Main, Germany Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, ...

Overexpression of Arabidopsis Reversion-To-ethylene Sensitivity1 (RTE1) results in whole-plant ethylene insensitivity dependent on the ethylene receptor gene Ethylene Response1 (ETR1). However, overexpression of the tomato RTE1 homologue Green Ripe (GR) delays fruit ripening but does not confer whole-plant ethylene insensitivity. It was decided to investigate whether aspects of ethylene-induced...

The methodology, characteristics and application of the sensitive C(2)H(2)-C(2)H(4) assay for N(2) fixation by nitrogenase preparations and bacterial cultures in the laboratory and by legumes and free-living bacteria in situ is presented in this comprehensive report. This assay is based on the N(2)ase-catalyzed reduction of C(2)H(2) to C(2)H(4), gas chromatographic isolation of C(2)H(2) and C(2...

The synthesis of conformationally constrained 2'-N,4'-C-ethylene-bridged adenosine (aza-ENA-A), in which the pentose-sugar is cis-fused with the piperidino skeleton at C2' and C4' centres of the sugar ring, is reported. The corresponding phosphoramidite building block will be used for incorporation into oligo-DNA and -RNA by solid phase synthesis to examine their nuclease stability as well as t...

Co-crystallisation of 1,8-naphthalenedicarboxylic acid (1,8-nap) with trans-1-(3-pyridyl)-2-(4-pyridyl)ethylene (3,4-bpe) gives a discrete molecular solid-state assembly, 2(3,4-bpe).2(1,8-nap) 1, that is held together by four O-H...N hydrogen bonds wherein the diacid directs a regiocontrolled [2 + 2] photodimerization; the reaction occurs by way of a single-crystal-to-single-crystal transformat...

The influence of ethylene oxide gas treatment on the in vitro degradation behavior of noncrosslinked, glutaraldehyde crosslinked or hexamethylene diisocyanate crosslinked dermal sheep collagen (DSC) using bacterial collagenase is described. The results obtained were compared with the degradation behavior of either nonsterilized or gamma-sterilized DSC. Upon ethylene oxide sterilization, reactio...

Elongation of hypocotyls of sunflower can be promoted by gibberellins (GAs) and inhibited by ethylene. The role of these hormones in regulating elongation was investigated by measuring changes in both endogenous GAs and in the metabolism of exogenous [(3)H]- and [(2)H(2)]GA(20) in the hypocotyis of sunflower (Helianthus annuus L. cv Delgren 131) seedlings exposed to ethylene. The major biologic...

The synthesis and characterization of new zirconium permethylpentalene (form)amidinate complexes are described: Pn*Zr{N(Dipp)2CH}Cl (1), Pn* = ?8-C8Me6 Dipp 2,6-iPr-C6H3; [Pn*Zr{N(p-tol)2CH}Cl]2 (2), p-tol 4-Me-C6H4; [Pn*Zr{N(iPr)2CMe}Cl]2 (3); Pn*Zr{N(iPr)2CPh}Cl (4); Pn*Zr{N(4-Me-C6H4)2CH}2 (5); [Pn*Zr{N(iPr)2CCH2}]2 (6); Pn*Zr{N(iPr)2CPh}(O-2,6,-Me-C6H3) (7). monohalide derivatives 1–4 demon...

High CO(2) concentration (0.5%) increased the rate of ethylene production, measured in a continuous flow system, in intact sunflower (Helianthus annuus L.) plants. However, the rate of ethylene production subsided to near control levels after approximately 24 hours. The effect of high CO(2) could only be observed in light. Although high CO(2) concentration had no effect on the rate of ethylene ...