منابع مشابه
Between Two Fern Genomes
Ferns are the only major lineage of vascular plants not represented by a sequenced nuclear genome. This lack of genome sequence information significantly impedes our ability to understand and reconstruct genome evolution not only in ferns, but across all land plants. Azolla and Ceratopteris are ideal and complementary candidates to be the first ferns to have their nuclear genomes sequenced. The...
متن کاملIsolation of two cytotoxic diterpenes from the fern Pteris multifida.
From aerial parts of the fern Pteris multifida Poir. (Polypodiaceae) two diterpenes, entkaurane-2 beta, 16 alpha-diol and ent-kaur-16-ene-2 beta, 15 alpha-diol, were isolated by repeated column chromatography using silica gel and silica gel impregnated with silver nitrate. The structures were confirmed by spectroscopic methods. Both compounds showed a moderate cytotoxicity to Ehrlich ascites tu...
متن کاملNotes on Barnsley Fern
An affine transformation on the plane is a mapping T that preserves collinearity and ratios of distances: given two points A and B, if C is the middle of the segment [A,B] then T (C) is the middle of the segment [T (A), T (B)]. Translations, contractions, expansions, reflections, rotations, are all particular cases of affine transformations. In general, an affine transformation T maps a point (...
متن کاملFERNS AND FERN ALLIES OF IRAN
The pteridophyte account of Flora Iranica (ed. K.H. Rechinger) is still not published. The Caspian forests provide suitable habitats for the growth of many ferns and fern allies in Iran. In semi-arid and mountainous areas of Iran, mesophilous plants are restricted to rock crevices, waterfall proximity, stream banks and lake shores. Based on field collections and study of herbarium specimens in ...
متن کاملIs Riboflavin the Photoreceptor in the Induction of Two-dimensional Growth in Fern Gametophytes?
Blue light controls the development of 2-dimensional form in the gametophyte phase of numerous ferns (2 and literature therein). Although the photoreceptor for this system is still unknown, it has been hypothesized to be a flavoprotein (7). Yeoh and Raghavan (11) have presented data which they interpreted as evidence for the existence of riboflavin (or lumichrome) as the photoreceptor. This con...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1902
ISSN: 0006-8071
DOI: 10.1086/328274