Responses of mosquitoes of the Anopheles farauti complex to 1-octen-3-ol and light in combination with carbon dioxide in northern Queensland, Australia

Abstract. In northern Queensland, Australia, three experiments were conducted to determine the response of mosquitoes of the Anopheles farauti complex to CDC traps baited with four attractant combinations: octenol + C0₂ and light; octenol and light; CO, and light; or C0₂ and octenol without light. A CDC-modified updraft light-trap was also trialled, but did not significantly enhance collections of An.farauti sensu lato. The combination of light, octenol and C0₂ caught significantly more An.farauti s.l. (both An.farauti No. 1 and No. 2 sibling species) when compared to C0₂ and light alone. Only small numbers of the An.farauti complex were captured when CDC traps were baited with octenol alone, i.e. no light or C0₂.     

A Relationship between Membrane Permeability and Ethylene Production at High Temperature in Leaf Tissue of Phaseolus vulgaris L.

Leaf discs cut from primary leaves of Phaseolus vulgaris L cvMasterpiece were incubated at temperatures higher than the growthtemperature of 25 °C Both basal and wound ethylene productionincreased up to temperatures of 35–37 5 °C, thereafterdeclining rapidly There was no detectable ethylene productionat temperatures above 42 5 °C Exposure of leaf discs tohigh temperature for 60 mm resulted in a large production ofwound ethylene when they were returned to 25 °C The magnitudeof ethylene production was related to the initial incubationtemperature as was the length of the lag period before maximumproduction was achieved The results are discussed in relationto the requirement for continued membrane integrity for ethyleneproduction ethylene, temperature, membrane permeability, Phaseolus vulgaris L, dwarf bean     

Polyribosome Content in Young and Aged Wheat Leaves Subjected to Drought

The effect of a droughting treatment on the polyribosome contentof wheat leaves was markedly different on leaves of differentages. Growing leaves showed a large decrease in their polyribosomepopulation, while fully expanded leaves showed no loss of polyribosomescompared with controls. These results suggest that the largereductions in polyribosome population observed in growing tissuesare due to reductions in growth, rather than a direct effectof water stress.     

Tests for resistance to white clover mosaic virus in red and white clover

A range of red and white clover cultivars was tested for immunity to white clover mosaic virus. All plants became infected although some showed no symptoms. Enzyme-linked immunosorbent assay (ELISA) and immunosorbent electron microscopy (ISEM) revealed significant differences in virus concentration between red clover cultivars and between clones of white clover artificially infected with the virus. These differences could not, however, be related to relative yield losses.     

A NEW SPECIES OF LITHOPHAGA (BIVALVIA: LITHOPHAGINAE) BORING CORALS IN THE CARIBBEAN

A new species of Lithophaga is described as a small lithophaginemussel exclusively boring Madracis mir-abilis, M. decactis andM. formosa in Jamaica. The shell, musculature and pallial glandsshow modifications for live coral boring similar to those ofIndo-Pacific species of the genus. However, both the boringand posterior pallial glands are more primitive than other speciesexamined to date, interpreted as indicative of a more recentadaptation to life in a living coral habitat by this species. ^*Contribution No.359 of the Discovery Bay Marine Laboratory,University of the West Indies (Received 23 April 1985;     

Chloroplast DNA in Expanding Spinach Leaves

The proportion of chloroplast DNA in total DNA from spinachleaves has been measured using the second order reassociationkinetics of a ³H-labelled chloroplast DNA probe in total DNAextracts. There was no significant difference between the proportionof chloroplast DNA in the basal and distal halves of 2 cm leavesand in the distal halves of 5, 8, and 10 cm leaves. The meanof all the observations was 21.1 ± 0.7%. There was littlechange in the average total DNA content of cells from any ofthe leaves but cells from larger leaves contained 130–170chloroplasts while cells from the basal half of 2 cm leavescontained about 20 chloroplasts which were smaller than thosefrom the larger leaves. Consequently the average number of copiesof the plastome per chloroplast in large leaves was about 30(5 x 10^–15 g DNA) and in the smaller chloroplasts in thebase of 2 cm leaves was 200 (32 x 10^–15 g DNA). Stainingwith the DNA fluorochrome 4, 6-diamidino-2 phenyl indole (DAPI)showed 10–15 plastid nucleoid areas in chloroplasts oflarger leaves, suggesting there are 2–3 copies of theplastome per plastid nucleoid.     

An automated coordinate recorder for biometry

Many measuring devices used in micropaleontology are unsatisfactory because observations must be recorded manually. Moreover, most use a linear scale that depends on the presence of predetermined morphological loci. An x, y recorder, largely adapted from instruments available in geological laboratories, is discussed. It obviates manual recording, frees data collection from the constraint of homologous loci and. in some applications, permits more shape information to be collected.     

A new species of Stomatostemma (Periplocaceae) from Mozambique, Africa

VENTER, H.J. T. & FIELD, D. V., 1989. A new species of Stomatostemma (Periplocaceae) from Mozambique, Africa. A new species of Stomatostemma is described from Mozambique. 11 is [he second species distinguished in the genus Stomatostemma N.E. Br., the other being S. monteiroae (Oliv.) N.E. Br., which was also described from Mozambique. The new species is distinguished from.V. monteiroae by being a virgate shrub, by the pendulous terminal branches and inflorescences, by the long and frail peduncles and pedicels and by the long clavate corona lobes.