Oriented morphogenetic phenomena in cambium of broadleaved trees
نویسندگان
چکیده
منابع مشابه
Oriented trees in digraphs
Let f(k) be the smallest integer such that every f(k)-chromatic digraph contains every oriented tree of order k. Burr proved f(k) ≤ (k − 1)2 in general, and conjectured f(k) = 2k − 2. Burr also proved that every (8k − 9)-chromatic digraph contains every antidirected tree. We improve both of Burr’s bounds. We show that f(k) ≤ k2/2 − k/2 + 1 and that every antidirected tree of order k is containe...
متن کاملBiomechanical and coherent phenomena in morphogenetic relaxation processes
Biological forms can be studied independently of the principles of their actualization, which was demonstrated in the book of D'Arcy Thompson "On Growth and Form" (1917) and in the nomogenetic theories of evolution. However the principles of actualization of forms have to be established and they are not directly related to the genetic system, being the generic phenomena non-reducible to the for...
متن کاملUnmanned Aerial Survey of Fallen Trees in a Deciduous Broadleaved Forest in Eastern Japan
Since fallen trees are a key factor in biodiversity and biogeochemical cycling, information about their spatial distribution is of use in determining species distribution and nutrient and carbon cycling in forest ecosystems. Ground-based surveys are both time consuming and labour intensive. Remote-sensing technology can reduce these costs. Here, we used high-spatial-resolution aerial photograph...
متن کاملVariations of Soil Microbial Community Structures Beneath Broadleaved Forest Trees in Temperate and Subtropical Climate Zones
Global warming has shifted climate zones poleward or upward. However, understanding the responses and mechanism of microbial community structure and functions relevant to natural climate zone succession is challenged by the high complexity of microbial communities. Here, we examined soil microbial community in three broadleaved forests located in the Wulu Mountain (WLM, temperate climate), Funi...
متن کاملLocally Oriented Noncrossing Trees
We define an orientation on the edges of a noncrossing tree induced by the labels: for a noncrossing tree (i.e., the edges do not cross) with vertices 1, 2, . . . , n arranged on a circle in this order, all edges are oriented towards the vertex whose label is higher. The main purpose of this paper is to study the distribution of noncrossing trees with respect to the indegree and outdegree seque...
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: Acta Societatis Botanicorum Poloniae
سال: 2015
ISSN: 2083-9480
DOI: 10.5586/asbp.1969.046