Estimations of phylogenies from morphological and molecular data often show contrasting results. We compared morphological and molecular phylogenies in an ancient family of woody dicots, the Betulaceae (birch family). The phylogeny of the family was estimated from parsimony analysis of morphological characters in the genera Alnus, Betula, Carpinus, Corylus, Ostrya, and Ostryopsis and from parsi...

O manejo em pequena escala é uma alternativa de uso dos recursos madeireiros para pequenos produtores no estado do Amazonas. Estudos florísticos são importantes o conhecimento da flora regional e seus potenciais diversos. objetivo deste estudo foi avaliar a composição florística estrutura florestal planos fim se conhecer quais espécies tem sido mais visada pelos rurais Amazonas verificar divers...

Alder wood (Alnus glutinosa L.) was steamed with a saturated steam-air mixture at temperature of t = 95 °C, or steam 115 °C and 135 to obtain pale brown colour, light red-brown colour dark brown-grey colour. Subsequently, samples unsteamed alder were irradiated UV lamp in Xenotest Q-SUN Xe-3-HS after drying order test the stability wood. The change surface evaluated by means measured values on ...

Se comparó el efecto del pastoreo de vacas Holstein en diferentes sistemas, sobre la producción y calidad leche. Los sistemas pastoriles (SP) evaluados fueron: kikuyo (Cenchrus clandestinus (Hochst. ex Chiov.) Morrone) (K), ryegrass (Lolium ssp.) (R), silvopastoriles ryegrass, botón oro (Tithonia diversifolia) aliso (Alnus acuminata) (sspR), kikuyo, (sspK) (sspRK). Las variables respuestas estu...

BACKGROUND AND AIMS 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 ...

Two new phenolic compounds, 4-O-glucopyranosyl-5-O-caffeoylshikimic acid (1) and 2,3-digalloyl oregonin (2), were isolated along with eight known phenolic compounds (3-10) from an 80% acetone extract of Alnus sibirica leaves. The chemical structures of these compounds were elucidated using 1D/2D nuclear magnetic resonance and high resolution-MS. The anti-oxidative activities of these compounds ...