Georgius Agricola

history of spectroscopy Historical Development of Flame Excitation Sources for Analytical Spectroscopy

In 1556 Georgius Agricola I wrote, in his De Re Metallica, about the "colour of fumes" from various types of ores. This may be the earliest record available in which the color of a flame-excited metal sample was used to identify a substance. If so, it represents the start of flame spectroscopy as an analytical tool. For several hundred years thereafter, development in this field was very slow. ...

New species of Calamoncosis Enderlein (Diptera: Chloropidae) from South Africa.

Three new and atypical species of Afrotropical Calamoncosis are described: Calamoncosis agricola sp. n. (type locality- South Africa: 15 km E Klaserie); Calamoncosis flavida sp. n. (type locality-South Africa: Roodewal); and Calamoncosis unicornis sp. n. (type locality-South Africa: 15 km E Klaserie). Calamoncosis unicornis exhibits extreme modification and sexual dimorphism in the antenna; in ...

بررسی سهم ایران در تحقیقات کشاورزی جهان سنجش کتابشناختی بانک‌های اطلاعاتی CAB, AGRIS, AGRICOLA از ابتدا تا سال 1997

Cinchona Root and Collar Rot in Peru and Bolivia^

*A contribution from the Estación Experimental Agricola en Tingo Maria, Peru, a technical agricultural service organization for the Oriente of Peru, operated jointly by the Dirección de Colonización y Asuntos Orientales, Ministry of Agriculture of Peru, and by the Ofläce of Foreign Agricultural Relations, U. S. Department of Agriculture. This study was made possible by funds provided through th...

An International Journal of Algal Research

ing and Indexing Services: The Journal is indexed by AGRICOLA, BIOSIS®, CAS, Current