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1. Concepts on the Causal Genesis of Human Intestinal Tumors The
action of chemical substances has a significant role in the genesis
of human tumors. It is assumed that most human tumors are induced
by exogenous chemical noxae (Schmahl, 1970;Heidelberger, 1975; and
others). In the course of intensive efforts to discover the
principles of tumor etiology, important insights have resulted in
recent years. These are that chemical carcinogens do not only arise
as products of our tech nological civilization, but that they also
occur in nature as potent solitary carcinogens and cocarcinogens
(e. g., as plant products). For review, see Hecker (1972) and
Preuss mann (1975). Not only "complete" carcinogens are significant
for the genesis of tu mors, but also substances which are first
transformed to the actual carcinogenic com pound in the organism
(Schmahl, 1975). The causal significance of exogenous noxae in
carcinogenesis is indicated by the fact emphasized by Bauer (1963)
that malignant tumors occur predilectively at those sites in the
body which are in direct or indirect contact with the environment.
This applies especially to the intestinal tract."
This is a reproduction of a book published before 1923. This book
may have occasional imperfections such as missing or blurred pages,
poor pictures, errant marks, etc. that were either part of the
original artifact, or were introduced by the scanning process. We
believe this work is culturally important, and despite the
imperfections, have elected to bring it back into print as part of
our continuing commitment to the preservation of printed works
worldwide. We appreciate your understanding of the imperfections in
the preservation process, and hope you enjoy this valuable book.
]+++ The below data was compiled from various identification fields
in the bibliographic record of this title. This data is provided as
an additional tool in helping to ensure edition identification:
++++ Anweisung Zum Anbau Des Nadelholzes Dietrich E. Kunze Helwing,
1788
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