Abstract This study provides descriptions, identification key and illustrations of diagnostic characters, as well comments on the distribution habitat species Olacaceae Schoepficeae occurring in eastern portion northeastern Brazil, this area includes states Alagoas, Ceará, Paraíba, Pernambuco Rio Grande do Norte. The morphological descriptions are based samples collected during field expedition...

PAGE INTRODUCTION ................................................................. 95 The problem, p. 95; advantages of Arcella for genetic studies, p. 96; characters studied, p. 97; cultural methods, p. 97; fission in Arcella, p. gg parent and offspring, p. gg; counting generations, p. 100; preservation of specimens, p. IOI ; length of life and number of progeny, p. 101 ; computations, p. 102...

The angiosperms are by far the largest group of terrestrial plants. Their spectacular diversity is often attributed to specialized pollination. Obligate pollination mutualisms where both a plant and its pollinator are dependent upon one another for reproduction are thought to be prone to rapid diversification through co-evolution and pollinator isolation. However, few studies have evaluated the...

this study was conducted to determine the effect of foliar salicylic acid (sa) and citric acid (ca) applications on growth, biochemical characteristics and essential oil content of thyme (thymus vulgaris l.) grown under field conditions. salicylic acid (0.5 and 1 mm) and citric acid (5 and 10 mm) were applied three times during the vegetation at 15 day intervals. results revealed that foliar ap...

Heading time in bread wheat (Triticum aestivum L.) is determined by three characters: vernalization requirement, photoperiodic sensitivity and narrow-sense earliness, which are involved in the phase transition from vegetative to reproductive growth. We identified and characterized the APETALA1 (AP1)-like MADS box gene in wheat (WAP1) as an activator of phase transition. Its expression starts ju...

ABSTRACf The value of vegetative anatomy in phylogenetic analysis is documented. Examples of the use of vegetative anatomy at different taxonomic levels show the continuing role of the anatomical method in building a more natural system of classification of the dicotyledons. The importance of correlating wood and leaf anatomical features with ecological and floristic preferences of taxa is emph...

The angiosperms are by far the largest group of terrestrial plants. Their spectacular diversity is often attributed to specialized pollination. Obligate pollination mutualisms where both a plant and its pollinator are dependent upon one another for reproduction are thought to be prone to rapid diversification through co-evolution and pollinator isolation. However, few studies have evaluated the...

Recently, there have been a lot of intense debates about the acceptance/rejection of paraphyletic groups in biological classification. On the one hand, evolutionary classification states that similarity and common descent are two criteria for biological classification and paraphyletic groups are natural units of biological classification. On the other hand, cladistic classification considers th...

"Myiasis" is a parasitic infestation of live human or vertebrate animal tissues or cavities caused by dipterous larvae (maggots) which feed on the host's dead or living tissue, liquid body substances or ingested food. They are extremely rare in Western countries, especially in E.N.T. practice, and to the best of our knowledge, only two cases of myiasis in a tracheostomy wound have been reported...