A study has been performed to measure the resistance of Pall Ultipor BB50 filters when exposed to humidified air for 48 h during artificial ventilation by an Engstrom Erica ventilator fitted with a Bennett Cascade Mk2 humidifier. A marked increase in resistance was demonstrated. A hypothesis is presented as to the aetiology of these findings together with details of minor modifications to the s...

nonea medik. is a genus of the boraginaceae tribe boragineae, with approximately 35 species worldwide. examination of their palynological characters supported the separation of taxa, which is usually based on morphological and micromorphological reproductive features. pollen grains of 10 taxa representing three groups of taxa in iran, the n. caspica group, the n. persica group and the n. lutea ...

Saltcedar (Tamarix pentandra Pall.) stem cuttings responded vegetatively to various photoperiods of 11-, 14-, 17-, and 8 + 1-hour duration. Total stem length, average stem length, cuticle thickness, and xylem vessel member outside diameter were significantly maximal under a 14-hour photoperiod and less under photoperiods above and below this level. Numbers of stems and roots produced were signi...

A study on the parasitofauna of 7 species of Iraqi reptiles revealed the presence of at least 8 adult helminth species and some tentatively identified larvae. The reptiles were Hemidactylus flaviviridis, H. persicus, Asaccus elisae, Spalerosophis d. cliffordi, Testudo g. terrestris, Mauremys c. caspica and Trionyx euphraticus. The helminths found comprised 1 species of digenetic trematodes (Tel...