Artificially produced chemical elements heavier than uranium have been known for more than seventy years and the number of superheavy elements continues to grow. Presently 26 transuranic elements are known. This paper examines the earliest scientific interest in the very heavy elements and the related question of an upper limit of the periodic system. In the period from the 1880s to the early 1...

Motivations for drawing hierarchical structures are probably as diverse as datasets to visualize. This ubiquity of tree structures has lead to a manifold of tree layout algorithms and tree visualization systems. While many tree layouts exist, increasingly massive data sets, expanding computational power, and still relatively limited display space make tree layout algorithms a topic of ongoing i...

A novel method and a framework called Memory-Based Forecasting are proposed to forecast complex and timevarying natural patterns with the goal of supporting experts’ decision making. This paper targets the local precipitation phenomena captured as echo patterns in weather radar images, and aims to realize a tool that supports weather forecasters. In our framework, past image patterns similar to...

It has been suggested that language learners prefer phonologically natural patterns overunnaturalones(McCarthy&Prince,1995;Tesar&Smolensky,1993,2000).Various researchers have cited evidence for this assertion based on production (Demuth, 1995; Gnanadesikan, 1995) and perception (Jusczyk, Smolensky, & Allocco, 2002). Two experiments presented in this article test whether 9-month-old infants lear...

Of late, Bader and Gatti [1] showed that the electron density ρ at any point r within a molecule may be viewed as consisting of contributions from a local source (LS) operating at all other points r' . When the LS is integrated over regions Ω satisfying the QTAIM definition of an atom in a molecule, ρ(r) may be equated to a sum of atomic contributions SF(r;Ω), each of which is termed as the sou...

Among the Basidiomycetes the species of the genus Coprinus have black spores and hymenia that, at maturity, are transformed through autodigestion into a black or inky fluid that drops from the pileus and blackens the soil beneath the fruiting structures. The melanins from three different species of Coprinus have been characterized by spectroscopic techniques, including cross-polarization, magic...

As condições básicas que devem ser satisfeitas por qualquer função de onda representando um sistema polieletrônico são apresentadas e discutidas. Em seguida, examinamos como construir funções de onda para sistemas polieletrônicos que satisfaçam àquelas condições e analisamos as condições sob as quais os conceitos clássicos de estrutura molecular, estrutura química e de ligação química podem ser...

The discovery of chemical reaction-driven tip-streaming (also known as “an amazing drop”) was made about a decade ago during measurements of the dynamic interfacial tension of a water-alkali pendant droplet immersed in oil-linoleic acid. A plausible explanation for this self-sustained ejection of micron sized droplets from the tip of the macroscopic pendant drop was offered at that time and att...

Approximately 10% of the alkaline phosphatase activity in human kidney is derived from the intestinal-type alkaline phosphatase isoform, which can be differentiated from adult intestinal alkaline phosphatase by selective reactivity with monoclonal antibodies. The NH2-terminal sequence of the renal intestinal-type alkaline phosphatase was shown to be identical to sequences of the adult and mecon...

The fundamental observation (2-7), that a number of biotin-requiring lactobacilli grow normally in the absence of this growth factor when they are supplied with certain fatty acids, prompted an inquiry into the chemical nature of the fatty acids of a number of these organisms. These investigations will contribute to a better understanding of fatty acid metabolism of microorganisms and, in addit...