a study of airborne ulmaceae pollen in modena (northern italy). | we examined ulmaceae airborne pollen at the modena-geophysical observatory monitoring station in 1993. the pollen trap was placed 15 m above the ground. 365 daily slides were fully analyzed to obtain daily and bi-hourly pollen concentrations. morphological analysis on native and introduced ulmaceae pollen was also conducted between february 3rd and may 17th. five pollen types were identified: celtis cf. australis, ulmus glabra, ulmus cf. laevis, ulmus cf. minor, and ulmus minor/laevis. pollen co ... | 1997 | 9276007 |
plant microsomal phospholipid acyl hydrolases have selectivities for uncommon fatty acids. | developing endosperms and embryos accumulating triacylglycerols rich in caproyl (decanoyl) groups (i.e. developing embryos of cuphea procumbens and ulmus glabra) had microsomal acyl hydrolases with high selectivities toward phosphatidylcholine with this acyl group. similarly, membranes from euphorbia lagascae and ricinus communis endosperms, which accumulate triacylglycerols with vernoleate (12-epoxy-octadeca-9-enoate) and ricinoleate (12-hydroxy-octadeca-9-enoate), respectively, had acyl hydrol ... | 1995 | 12228415 |
seed germination of three ulmus species from turkey as influenced by temperature and light. | the effect of temperature and light on the germination performance of ulmus minor, ulmus glabra and ulmus laevis were studied in this research. seeds were germinated under constant temperatures of 20 and 25 degrees c and alternating temperatures of 25/15 and 30/20 degrees c. within each temperature regime, seeds were subjected daily to the following photoperiods: total darkness and 8 hr photoperiod. temperature and light affected seed germination percentage (gp) and germination rate expressed as ... | 2007 | 17929760 |
biological method to quantify progressive stages of decay in five commercial woods by coriolus versicolor. | biologic agar-block method was developed that allowed wood samples to be evaluated and monitored in terms of colonization and development of the decay by basidiomycetes fungi (coriolus versicolor) and to be directly classified based on mean mass loss. in this research, the in vitro decay of five commercial woods by coriolus versicolor was studied by the agar-block method. the selected wood samples were abies alba, populus alba, fagus orientalis, platanus orientalis and ulmus glabra. the results ... | 2007 | 19070053 |
using sex pheromone and a multi-scale approach to predict the distribution of a rare saproxylic beetle. | the european red click beetle, elater ferrugineus l., is associated with wood mould in old hollow deciduous trees. as a result of severe habitat fragmentation caused by human disturbance, it is threatened throughout its distribution range. a new pheromone-based survey method, which is very efficient in detecting the species, was used in the present study to relate the occurrence of e. ferrugineus to the density of deciduous trees. the latter data were from a recently completed regional survey in ... | 2013 | 23840415 |
nonvolatile chemical cues affect host-plant ranking by gravid polygonia c-album females. | in a multiple-choice test, the preference of egg-laying polygonia c-album (comma butterfly) females was studied for oviposition on plants bearing surrogate leaves treated with crude methanol extracts obtained from leaves of seven host-plant species: humulus lupulus, urtica dioica, ulmus glabra, salix caprea, ribes nigrum, corylus avellana, and betula pubescens. the ranking order of surrogate leaves treated with host-plant extracts corresponded well to that reported on natural foliage, except r. ... | 2012 | 22486046 |
host plant utilization in the comma butterfly: sources of variation and evolutionary implications. | a major challenge in the study of insect-host plant interactions is to understand how the different aspects of offspring performance interact to produce a preference hierarchy in the ovipositing females. in this paper we investigate host plant preference of the polyphagous butterfly polygonia c-album (lepidoptera: nymphalidae) and compare it with several aspects of the life history of its offspring (growth rate, development time, adult size, survival and female fecundity). females and offspring ... | 1994 | 28313958 |
genome size estimations on ulmus minor mill., ulmus glabra huds., and celtis australis l. using flow cytometry. | the ulmaceae family is composed of nearly 2000 species widely distributed in the northern hemisphere. despite their wide distribution area, there are only four native species in the iberian peninsula. in this work the genome size of three of those species (ulmus minor, u. glabra, and celtis australis) was estimated using flow cytometry. the nuclear dna content of c. australis was estimated as 2.46 +/- 0.061 pg/2c, of u. minor as 4.25 +/- 0.158 pg/2c, and of u. glabra as 4.37 +/- 0.103 pg/2c of d ... | 2007 | 17642035 |
the mathematical treatment of leaf venation: the variation in secondary vein length along the midrib. | in some dicotyledonous leaves and leaflets, the secondary veins run more-or-less straight to the margins and have well-defined lengths. for a given half-lamina of length l, an equation, previously proposed, relates the lengths of these veins, p, to the distances, l, between the leaf tip and their insertions on the midrib: p = b2(x+y)l(x)(l - l)(y)/l(x+y-1), where b, x and y are fitted parameters. aspects of the formula are re-examined, including its general applicability, significance and useful ... | 2004 | 14707000 |
climate change and micro-geographic variation in laying date. | climate change has been shown to affect the timing of reproduction, with earlier reproduction being associated with an increase in temperature. changes in the timing of reproduction arise from changes in food availability as well as other factors, and differences in the timing of reproduction among sites may cause sites with early reproduction to contribute disproportionately to local recruitment. in this study, spatial variation in the laying date of barn swallows hirundo rustica at 39 sites in ... | 2008 | 18224340 |