Effect of educational leaflets and questions on knowledge of contraception in women taking the combined contraceptive pill: randomised controlled trial

Objective: To assess whether provision of educational leaflets or questions on contraception improves knowledge of contraception in women taking the combined contraceptive pill.

The evolution of coloration and toxicity in the poison frog family (Dendrobatidae)

The poison frogs (family Dendrobatidae) are terrestrial anuran amphibians displaying a wide range of coloration and toxicity. These frogs generally have been considered to be aposematic, but relatively little research has been carried out to test the predictions of this hypothesis. Here we use a comparative approach to test one prediction of the hypothesis of aposematism: that coloration will evolve in tandem with toxicity. Recently, we developed a phylogenetic hypothesis of the evolutionary relationships among representative species of poison frogs, using sequences from three regions of mitochondrial DNA. In our analysis, we use that DNA-based phylogeny and comparative analysis of independent contrasts to investigate the correlation between coloration and toxicity in the poison frog family (Dendrobatidae). Information on the toxicity of different species was obtained from the literature. Two different measures of the brightness and extent of coloration were used. (i) Twenty-four human observers were asked to rank different photos of each different species in the analysis in terms of contrast to a leaf-littered background. (ii) Color photos of each species were scanned into a computer and a computer program was used to obtain a measure of the contrast of the colors of each species relative to a leaf-littered background. Comparative analyses of the results were carried out with two different models of character evolution: gradual change, with branch lengths proportional to the amount of genetic change, and punctuational change, with all change being associated with speciation events. Comparative analysis using either method or model indicated a significant correlation between the evolution of toxicity and coloration across this family. These results are consistent with the hypothesis that coloration in this group is aposematic.

Poison ivy / by James B. McNair, Associate in Economic Botany.

no.12(1926)

Manual for the use of borosilicate Raschig rings as a fixed nuclear poison /

"U.S. Atomic Energy Commission Contract AT(29-1)-1106."

Observations and experiments on the poison of copper /

Mode of access: Internet.

Recherches naturelles, chimiques et physiologiques sur le curare : poison des flèches des sauvages américains /

Mode of access: Internet.

A guide for teaching poison prevention in kindergartens and primary grades.

Earlier edition, issued by the Division's Poison Control Branch, has title: A guide for teaching poison prevention in kindergartens.

The poison-flower; a phantasy in three scenes, suggested by Hawthorne's Rappacini's daughter.

Mode of access: Internet.

A guide to teaching poison prevention in kindergarten & primary grades.

Cover title.

Laws relating to feeds, fertilizers, economic poison, paints & oil, serial numbers on farm implement with regulations /

Cover title.

Laws relating to feeds, fertilizers, economic poison, paints & oil, serial numbers on farm implement with regulations /

Cover title.

Laws relating to feed-fertilizers economic poison with regulations /

Mode of access: Internet.

Poison-ivy and poison-sumac; their growth habits and variations, including distribution in Canada, Mexico, Central America, and the United States, with special reference to Illinois.

Bibliography: p. 35-36.

Poison control program report.

Mode of access: Internet.

Pratical hints on opium considered as a poison.

Mode of access: Internet.