Physicochemical Problems Relating to Soil
نویسندگان
چکیده
منابع مشابه
Physicochemical Properties of Soil from Five Villages in Botswana with Respect to Soil Degradation
field study was conducted at five villages of Botswana namely, Tsabong, Tshane, Mathathane, Motlhabaneng and Tsetsejwe during the periods of June to August 1999 and June to August 2000. The objective of the study was to assess and compare the soil physicochemical properties of soils at the five villages and to study the effect of cultivation on some soil physical properties. Parameters measured...
متن کاملSoil and Worm: On Eating as Relating
Earthworms and soil combine in an ecotoxicological experiment in the Vrije Universiteit in Amsterdam. To determine the effects of a toxic compound produced by genetically modified broccoli, ecotoxicologists use the earthworm in a standardized test to understand the conditions of the soil. In the experiment a variety of elements are brought together and associated in a stable network, but the wo...
متن کاملProblems and pitfalls in relating climate variability to population dynamics
We discuss 3 methodological issues involved in climate-population dynamics research. Precise alternative hypotheses are the first requirement, and correlational studies are the weakest way to test the multiple working hypotheses required. Large-scale effects are difficult to investigate because of heterogeneity in environmental variables, and long-term predictions require more patience to test ...
متن کاملSome Problems Relating to the Dorsal Spinal Nerve Roots *
Discussion in the past has centered around three particular aspects of the dorsal spinal roots. I refer specifically to the possible "pain pathway" along unmyelinated nerve fibres, the location of the cell station of the visceral afferent fibres, and the explanations offered for the vasodilator response obtained by stimulation of the distal ends of the dorsal spinal roots. Opinion is now settli...
متن کاملRelating physicochemical properties of amino acids to variable nucleotide substitution patterns among sites.
Markov-process models of codon substitution were implemented that account for features of DNA sequence evolution (such as transition/transversion bias and codon usage bias) as well as heterogeneity of amino acid substitution pattern over sites. The codon (amino acid) sites are assumed to come from several classes (such as secondary structure categories), among which the rate of amino acid subst...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1922
ISSN: 0006-8071
DOI: 10.1086/333064