of the United States and began to compile data annually to provide the record of all sorts of domains of American life. Data on population, finance, commerce, agriculture, exports, mining, railroads, telegraphs, immigration, education, and public lands were all published and developed into time series collections thereafter. The leaders of the Federal Statistical System became major leaders in ...

A primary goal of managing invasive aquatic plants is to selectively control the target plant without impacting more desirable plant species. A native plant of concern is wild rice ( Zizania palustris L.). Wild rice provides habitat for fish and wildlife, is a food source for waterfowl, and is utilized by humans as a cereal grain. The objective of this study was to examine the sensitivity of th...

The structure of the title compound, C(19)H(9)O, has been redetermined at 150 K. The redetermination is of significantly higher precision than a previous room-temperature structure [Ribar et al. (1974 ▶). Cryst. Struct. Commun.3, 323-325]. The C-N bond lengths for this redetermination are much closer to those observed in comparable structures, and the orientation of the methyl group with respec...

Hansen's disease is considered to be one of the well-known infections which upset serological tests for syphilis in patients in whom there has been no past or current treponemal infection. The reason why lepers are biological false positive (B.F.P.) reactors and why this failure in the specificity of lipoidal reactions occurs remains obscure. The frequency of false positive reactions is said to...

In this work, Kirchhoff’s law (Kirchhoff G. Monatsberichte der Akademie der Wissenschaften zu Berlin, sessions of Dec. 1859, 1860, 783–787) is being revisited not only to mark its 150th anniversary but, most importantly, to highlight serious overreaching in its formulation. At the onset, Kirchhoff’s law correctly outlines the equivalence between emission and absorption for an opaque object unde...

Este artigo descreve os tópicos usados no Págico, a primeira avaliação conjunta em recolha de informação centrada em tópicos relacionados com a lusofonia, usando o material da Wikipédia em português. Depois de uma explicação sobre como os tópicos foram escolhidos e de questões associadas à sua escolha e à sua categorização posterior, os tópicos são apresentados por categoria. Comentamos também ...