The cloning of a-amylase gene of S . occidentalis and the construction of starch digestible strain of yeast, S . cerevisiae AS. 2.1364 with ethanol-tolerance and without auxotrophic markers used in fermentation industry were studied. The yeast/E . coli shuttle plasmid YCEpl partial library of S. occidentalis DNA was constructed and a-amylase gene was screened in S. cerevisiae by amylolytic acti...

A rare coniferous Tertiary relict tree species, Thuja sutchuenensis Franch, has survived in the Daba Mountains of southwestern China. It was almost eliminated by logging during the past century. We measured size and age structures and interpreted regeneration dynamics of stands of the species in a variety of topographic contexts and community associations. Forest communities containing T. sutch...

The deep-water crangonid Parapontophilus occidentalis (Faxon, 1893) is endemic to the eastern Pacific and has been reported from Mexico to Chile, in depths of 837-4082 m. Material collected off the west coast of the Baja California Peninsula (BCP) during the TALUD XV, XVI and XVI-B cruises consists of a series of 136 specimens (M:F = 1:3.6) with 30 % of ovigerous females. The material examined ...

We tested the hypothesis that marginal fragmented populations of eastern white cedar (EWC) are genetically isolated due to reduced pollen and gene flow. In accordance with the central-marginal model, we predicted a decrease in population genetic diversity and an increase in differentiation along the latitudinal gradient from the boreal mixed-wood to northern coniferous forest. A total of 24 eas...

Anthophilous flower thrips in the genus Frankliniella (Thysanoptera: Thripidae) exploit ephemeral plant resources and therefore must be capable of successfully locating appropriate hosts on a repeated basis, yet little is known of interspecific and intraspecific variation in responses to host plant type and nutritional quality. Field trials were conducted over two seasons to determine if the ab...

We n&asured leaf respiration in 18 eastern deciduous forest tree species to determine if there were differences in tempera i m-respiration response functions among species or among c opy positions. Leaf respiration rates were measured in situ an4 on detached branches fordcerpensylvanicum L., A. rubrum i., Betula spp. (B. alleghaniensis Britt. and B. renta L.), Caryq glabra (Mill.) Sweet, Cornus...

Environmental pollution is an important issue in metropolitan areas, and roadside trees are directly affected by various sources of to which they exhibit numerous responses. The aim the present study was identify morpho-physio-biochemical attributes maidenhair tree (Ginkgo biloba L.) American sycamore (Platanus occidentalis growing under two different air quality conditions (roadside with high ...