Biomphalaria occidentalis Paraense, 1981 from Varzea das Flores dam, MG, Brazil, was exposed to infection with Schistosoma mansoni. Individual infection was performed with 140 B. occidentalis and 100 B. glabrata snails using LE and SJ strains. Two groups of B. occidentalis were killed after seven day-miracidia exposure to detect S. mansoni DNA, through the low stringency polymerase chain reacti...

Historically, desert drainages of the American southwest supported productive riverine wetlands (ciénegas). Region-wide erosion of ciénegas during the late 19th and early 20th century dramatically reduced the abundance of these ecosystems, but recent reestablishment of wetlands in Sycamore Creek, Arizona, USA, provides an opportunity to evaluate the mechanisms underlying wetland development. A ...

Transcription of amyloplast DNA in a heterotrophic line of cultured cells of sycamore (Acer pseudoplatanus L.) appeared to be greatly suppressed. A mutant cell line obtained from the heterotrophic line is green and autotrophic. Heavy modification of amyloplast DNA with a variety of methylated bases was demonstrated by analysis of the acid hydrolysate of DNA by high-performance liquid chromatogr...

When sycamore cells were suspended in basal medium containing choline, the latter was taken up by the cells very rapidly. A facilitated diffusion system appertained at low concentrations of choline and exhibited Michaelis-Menten kinetics. At higher choline concentrations simple diffusion appeared to be the principal mode of uptake. Addition of choline to the perfusate of compressed sycamore cel...

The effects of copper deficiency on cell culture growth, cell respiration, mitochondrial oxidative properties, and electron transport chain have been studied with suspension-cultured sycamore cells (Acer pseudoplatanus L.). Within the range of the copper concentration studied (0.1-25 mug/1 of culture medium), the mean rate of cell division is independent of copper concentration. An initial copp...

Meloidogyne platani n. sp. is described and illustrated from specimens obtained from roots of American sycamore, Platanus occidentalis, in Virginia. This new species shows certain similarities with M. arenaria but differs from it by a number of distinctive characters. The perineal pattern of females is rounded with fine, wavy to zig-zag striae and raised, convoluted striae in the inner lateral ...

Pectic fragments of cell wall polysaccharides, released from the walls of suspension-cultured sycamore cells by treatment with endopolygalacturonase, were tested for morphogenesis-regulating activity in a modified tobacco thin-cell-layer explant (TCL) bioassay (D. Mohnen, S. Eberhard, V. Marfa, N. Doubrava, P. Toubart, D. J. Gollin, T.A. Gruber, W. Nuri, P. Albersheim, and A. Darvill, manuscrip...

BACKGROUND AND AIMS Covalent linkages between xyloglucan and rhamnogalacturonan-I (RG-I) have been reported in the primary cell walls of cultured Rosa cells and may contribute to wall architecture. This study investigated whether this chemical feature is general to angiosperms or whether Rosa is unusual. * METHODS Xyloglucan was alkali-extracted from the walls of l-[1-3H]arabinose-fed suspens...