For an understanding of the phenomena, the first condition is the introduction of adequate concepts; only with the help of the correct concepts can we really know what has been observed. When we enter a new field, very often new concepts are needed, and these new concepts usually come up in a rather unclear and undeveloped form. Later they are modified, sometimes they are almost completely aban...

In Inner Mongolia, steppe grasslands face desertification or degradation because of human overuse and abandonment after inappropriate agricultural management. The soils in these abandoned croplands exist in heterogeneous environments characterized by widely fluctuating microbial growth. Quantitative polymerase chain reaction analysis of microbial genes encoding proteins involved in the nitrogen...

Planting seedlings is a common technique for abandoned pastures restoration in the tropics, supposedly by increasing the seedling recruitment and accelerating succession. In this study we evaluated the role of a young restored forest (one year old) in enhancing seedling establishment from two sources (seed rain and seed bank), in the Atlantic Rainforest region in Southern Brazil. We compared ab...

The original aims of artificial intelligence, when it was launched in the late 1950s, were to explain intelligence in information-processing terms and to reproduce the entire range of human cognitive abilities in computational artifacts. Although the field has seen impressive advances in the last few decades, many researchers have, in the process, forgotten or abandoned these important goals. T...

is exhorted to focus attention on the beginnings of disease. This changing frame of mind makes exhausting demands upon the methods available for such observations. Progress has to wait for the provision of efficient technique. Hurry spells wasted effort ; for he who examines in detail the technics of the day or visits the "midden heaps" of abandoned processes and discarded data soon understands...

The idea of Universal Grammar (UG) as the hypothetical linguistic structure shared by all human languages harkens back at least to the 13th century. The best known modern elaborations of the idea are due to Chomsky. Following a devastating critique from theoretical, typological and field linguistics, these elaborations, the idea of UG itself and the more general idea of language universals stan...

diagnostic status. Nevertheless, many clinicians are sceptical that personality can be assessed reliably and some hold that the diagnosis should be abandoned as being merely judgemental and pejorative (Lewis & Appleby, 1988). There is some basis for scepticism in respect of reliability in view of the evidence that even with operational criteria the clinical assessment of personality is not tran...

To develop appropriate measures to prevent soil contamination in abandoned mining areas, an understanding of the spatial variation of the potentially toxic trace elements (PTEs) in the soil is necessary. For the purpose of effective soil sampling, this study uses hot spot analysis, which calculates a z-score based on the Getis-Ord Gi* statistic to identify a statistically significant hot spot s...

BACKGROUND Global demand for food has led to increased land-use change, particularly in dry land ecosystems, which has caused several environmental problems due to the soil degradation. In the Cuatro Cienegas Basin (CCB), alfalfa production irrigated by flooding impacts strongly on the soil. METHODS In order to analyze the effect of such agricultural land-use change on soil nutrient dynamics ...