Although spine variation within cacti species or populations is assumed to be large, the minimum sample size of different spine anatomical and morphological traits required for species description is less studied. There are studies where only 2 spines were used for taxonomical comparison amnog species. Therefore, the spine structure variation within areoles and individuals of one population of ...

Este trabalho objetivou avaliar as respostas de crescimento três espécies globulares da família Cactaceae: Astrophytum asterias (Zucc.) Lem., Gymnocalycium anisitsii subsp. multiproliferum (P.J. Braun) P.J. Braun & Esteves e Frailea grahliana (F. Haage) Britton Rosee cultivadas em substratos orgânicos puros. A escolha das foi realizada com base no seu valor comercial nacional na disponibili...

A systematic comparative study of the binding of antitumor Morin and its complexes with DNA has been investigated in the Britton-Robison (BR) buffer solutions using voltammetric and spectroscopic methods. The results show that Morin molecule, acting as an intercalator, is inserted into the cavity of the beta-cyclodextrin (beta-CD) as well as into the base stacking domain of the DNA double helix...

Th ere is no doubt that the U.S. Supreme Court has in-fl uenced the politics of the country. As a public body, the Court is a highly visible part of the federal government. Th is has always been so, even when the justices met briefl y twice a year in the drafty basement of the Capitol. Yet the idea that the Court itself is a political institution is controversial. Th e justices themselves have ...

| In 1982, Edward Fredkin invented a way to build a time-reversible universal computer using fric-tionless \billiard balls" rolling on a table top, and in which ball \bounces" corresponded to Boolean logical operations. This model made it seem possible to perform unboundedly long computations while consuming zero power. But, achieving that feat seemed to require perfect precision and perfectly ...

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