This study describes a Platycerium bifurcatum (Cav.) C. Chr. propagation method through initiation of green globular bodies (GGBs) from juvenile leaf explants of in vitro grown sporophytes. The GGB initiation was first obtained by incubating the explants on MS medium supplemented with α-naphthalene acetic acid (NAA) and two other cytokinins, 2-isopentenyl adenine (2ip) or 6-benzylaminopruine (B...

We give explicit formulas for the cohomology of the Heisenberg Lie algebras over fields of finite characteristic. We use this to show that in characteristic two, unlike all other cases, the Betti numbers are unimodal. The Heisenberg Lie algebra is the algebra hm with basis {x1, . . . , xm, y1, . . . , ym, z} and nonzero relations [xi, yi] = z, 1 ≤ i ≤ m. The cohomology (with trivial coefficient...

The CF and CF3 1 fragment ion yield curves from C2F4 have been remeasured by photoionization mass spectrometry. Fits with appropriate model curves yield the appearance potentials AP0~CF3 /C2F4!513.72160.005 eV and AP0~CF /C2F4!513.77760.005 eV and an accurate difference in ionization potentials, IP~CF!2IP~CF3!50.05560.003 eV. With the existing photoelectron value IP~CF!59.1160.01 eV, this produ...

Loxopterygium huasango Spruce ex Engl., of the Anacardiaceae family, classified critically endangered, is a forest tree with considerable value in Seasonally Dry Tropical Forest (SDTF) northwest Peru and south Ecuador. The aim study was callus induction, propagation germplasm conservation using vitro tissue culture techniques. In seed germination (90%) obtained on Murashige Skoog (MS) medium su...

Acacia auriculiformis, one of the short rotation and fast growing tree species is known for its pharmacological properties notably anti-helminthic, antifilarial, microbicidal, spermicidal activity etc. Conservation of Acacia auriculiformis is essential via ex situ plantation as the seed germination rate of this plant species has been reported very poor around 20-28%. Clonal multiplication forms...

Apparently free-base cytokinins can interact with cupric ions in a specific manner. Oxidation of NADH by a horseradish peroxidase system was strongly promoted by such cytokinins provided cupric ions were present. Oxidation was promoted by 5 micromolar kinetin, zeatin, 6-benzylaminopurine (BA), or 6-(Delta(2)-isopentenylamino)purine (2iP) but not by adenine, 6-methylaminopurine or 6,6-dimethylam...

Dyckia brevifolia is an endangered plant used for ornamental purposes. As no references to the in vitro propagation of species exist, present study aims at investigating possibility efficient micropropagation protocol. Seeds collected from mother plants were germinated high percentages (84–86%) a range 15–25 °C, without any pre-treatment, and demonstrated their highest germination speed index (...