EVIDENCE AGAINST GENETIC SELF-INCOMPATIBILITY IN THE HOMOSPOROUS FERN PTERIDIUM AQUILINUM
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منابع مشابه
Isolation of an active glucoside in bracken fern, Pteridium aquilinum.
An active glucoside that enhanced release of histamine from rat peritoneal mast cells was isolated from a toxic fraction of bracken fern, Pteridium aquilinum, by partition column chromatography on Sephadex G-25. It was a yellowish amorphous powder on freeze-drying, readily soluble in water or ethanol, and insoluble in ether. It was hydrolysed with beta-glucosidase to release D-glucose. It was a...
متن کاملObservations on the Microanatomy of the Spermatozoid of the Bracken Fern (Pteridium aquilinum)
Salient features of structure of the spermatozoid of a fern (Pteridium aquilinum) have been determined by a combination of visual and ultraviolet microscopy, with electron microscopy of shadow-cast whole mounts and thin sections, using magnifications up to but not exceeding 50,000 diameters. Attention has been concentrated on the arrangement rather than on the internal details of the various pa...
متن کاملNuclear bodies in the maturing egg cell of a fern, Pteridium aquilinum.
Nuclear bodies about 250 nm in diameter, and with a strong affinity for uranium and acriflavine, appear in the nuclei of maturing egg cells of Pteridium. Many enter well-defined evaginations of the nucleus. The nuclear bodies are almost wholly digested by Pronase, but are resistant to ribonuclease and deoxyribonuclease. Radioactive labelling gives no evidence of the presence of nucleic acids, b...
متن کاملQuercetin, a rat intestinal and bladder carcinogen present in bracken fern (Pteridium aquilinum).
Albino noninbred weanling male and female rats were fed a basic grain diet (Group 1) or a basic diet supplemented with 33% bracken fern [BF (Group 2)] or 0.1% quercetin [purity, > 99% (Group 3)] for 58 weeks. The quantities of quercetin and kaempferol (a close structural analog) in BF as glycosides were determined to be 0.57 and 1.1 g, respectively, per kg of dried BF. Estimated mean total cumu...
متن کاملCarcinogenic and mutagenic activities of milk from cows fed bracken fern (Pteridium aquilinum).
Carcinogenicity, toxicity, and mutagenicity of the milk of bracken fern (BF)-fed cows were determined. Four Brown Swiss cows were fed a BF-containing diet, and two cows were fed a normal hay-grain diet. The milk obtained was fed to rats as either fresh or freeze-dried powdered milk mixed with grain diet: 9 of 34 fed whole milk and 11 of 56 fed powdered milk diet developed small intestine, kidne...
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ژورنال
عنوان ژورنال: Evolution
سال: 1972
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1972.tb00174.x