1,517 research outputs found
Google matrix analysis of DNA sequences
For DNA sequences of various species we construct the Google matrix G of
Markov transitions between nearby words composed of several letters. The
statistical distribution of matrix elements of this matrix is shown to be
described by a power law with the exponent being close to those of outgoing
links in such scale-free networks as the World Wide Web (WWW). At the same time
the sum of ingoing matrix elements is characterized by the exponent being
significantly larger than those typical for WWW networks. This results in a
slow algebraic decay of the PageRank probability determined by the distribution
of ingoing elements. The spectrum of G is characterized by a large gap leading
to a rapid relaxation process on the DNA sequence networks. We introduce the
PageRank proximity correlator between different species which determines their
statistical similarity from the view point of Markov chains. The properties of
other eigenstates of the Google matrix are also discussed. Our results
establish scale-free features of DNA sequence networks showing their
similarities and distinctions with the WWW and linguistic networks.Comment: latex, 11 fig
Move ordering and communities in complex networks describing the game of go
We analyze the game of go from the point of view of complex networks. We
construct three different directed networks of increasing complexity, defining
nodes as local patterns on plaquettes of increasing sizes, and links as actual
successions of these patterns in databases of real games. We discuss the
peculiarities of these networks compared to other types of networks. We explore
the ranking vectors and community structure of the networks and show that this
approach enables to extract groups of moves with common strategic properties.
We also investigate different networks built from games with players of
different levels or from different phases of the game. We discuss how the study
of the community structure of these networks may help to improve the computer
simulations of the game. More generally, we believe such studies may help to
improve the understanding of human decision process.Comment: 14 pages, 21 figure
Contagion effects in the world network of economic activities
Using the new data from the OECD-WTO world network of economic activities we
construct the Google matrix of this directed network and perform its
detailed analysis. The network contains 58 countries and 37 activity sectors
for years 1995, 2000, 2005, 2008, 2009. The construction of , based on
Markov chain transitions, treats all countries on equal democratic grounds
while the contribution of activity sectors is proportional to their exchange
monetary volume. The Google matrix analysis allows to obtain reliable ranking
of countries and activity sectors and to determine the sensitivity of
CheiRank-PageRank commercial balance of countries in respect to price
variations and labor cost in various countries. We demonstrate that the
developed approach takes into account multiplicity of network links with
economy interactions between countries and activity sectors thus being more
efficient compared to the usual export-import analysis. Our results highlight
the striking increase of the influence of German economic activity on other
countries during the period 1995 to 2009 while the influence of Eurozone
decreases during the same period. We compare our results with the similar
analysis of the world trade network from the UN COMTRADE database. We argue
that the knowledge of network structure allows to analyze the effects of
economic influence and contagion propagation over the world economy.Comment: this work is linked with arXiv:1504.06773 [q-fin.ST
Evolving a new idiom to express Tamil life through translations: an achievable task or impossibility?
Critics have spoken of an innovative idiom to express Sri Lankan experience in
English but intelligibility is a further problem faced by international readers. There are two factors
that need to be considered. One is that native and traditional metaphors may not be able to express
modern life. On the other hand the range of experiences and problems faced by all Sri Lankans could
not be expressed by the English educated elite. Therefore achieving our goal of writing good poetry
which expresses a truly Sri Lankan experience in an internationally understandable and effective
medium may be made practicable through translations. They would be able to express their variety of
experiences fusing modern, western and local imagery in the new idiom understandable to an
international audience. Having stated the focal point, the present paper makes an attempt to look into
the poems translated into English from Tamil selected from the writings of the poets living in Sri
Lanka, though there are Tamil poems translated into English from India, Singapore, Malaysia and the
Diaspora in Europe, Canada and Australia. The study focuses on the possibility of evolving a new
idiom to express Sri Lankan Tamil life in English
Protein composition of rat uterine flushings
Thesis (M.Sc.) -- University of Adelaide, Dept. of Anatomy and Histology, 197
Supporting safe medicines transition for residents entering care homes
Postponed access: the file will be accessible after 2022-05-19Master´s Thesis in PharmacyFARM399/05HMATF-FAR
Effects of Calcium Silicate on Yield and Nutrient Uptake and Mechanism of Silicon Transport in Plants
The effect of calcium silicate on yield and nutrient uptake by plants and the mechanism of Si uptake were studied in a series of three experiments. First, response to Si was measured on 22 plant species grown on two soils with four levels of calcium silicate in a greenhouse; second, corn was grown in the field to determine the magnitude of response to residual Si with variable P and pH levels; and third, five plant species were grown in culture solutions at varying transpiration rates to study the mechanism of Si uptake.
Response to calcium silicate differed with species and the same species grown on different soils had variable amounts of Si and P depending on the Si contents of the soils. In general the 2.2 T Si/ha application produced maximum yields in both soils and in some species it produced yields comparable to those with 8.8 T Si/ha at lower cost. Silicon concentrations in different plant groups were in the following order: grains > grasses > vegetables and fruits > legumes except for those of the two Desmodiums in which concentrations were similar to those of grasses. Plant Ca concentrations generally increased whereas Mg, Mn, A1 and Fe concentrations generally decreased when calcium silicate was applied. Silicon concentration was greatest in papaya and pineapple leaves and in sugarcane sheaths and was lowest in stems.
Hawaiian Cement Corporation (HCC) and Tennessee Valley Authority (TVA) calcium silicates generally produced higher yields than Technical grade (TG) calcium silicate, especially at low rates and in the third and fourth harvests. Plant Si concentrations in both HCC and TG calcium silicate were generally higher than in the TVA material indicating greater Si availability in these two materials.
Ear corn yields in the field were significantly increased by P applications but were not significantly affected by residual Si or pH. Highest stover yields were obtained at pH 5.5 suggesting increased Si solubility at this pH may have increased stover yields by increasing mechanical strength and P availability. The application of 280 kg P/ha with Si produced yields nearly equal (98%) to those of 1120 kg P/ha without Si suggesting that comparable yields at lower cost may be obtained with the combination of high Si and low P, than with high P alone. Corn leaf Si values of 0.5 to 0.6% at silking appeared adequate for corn growth. Silicon taken up by the plant is more closely related to soil Si extracted with water than with sulphuric acid. Multiple regression analysis with yield and leaf nutrients indicated that Si, P and Fe are especially important for stover production while P, Ca, K, A1 and Fe are important for ear production.
A statistically significant increase in the amount of water transpired per gram of dry weight with decreasing relative humidity was found in all species except D. intortum in solution cultures, but no significant increase in Si transport was obtained with increasing transpiration in any species. This suggests that transport of Si in plants is not related to transpiration. In continuous dark, plants accumulated Si in the roots and only sugarcane translocated large amounts of Si to the tops suggesting that metabolic energy is required for Si transport. Additional evidence of active Si transport was provided by the transpiration stream concentration factor (TSCF) values which were above or below one. Silicon concentrations in xylem exudates of D. Intortum, corn and sugarcane were greater than those of external solutions suggesting Si movement by active transport rather than by mass flow. In tomato and alfalfa Si concentrations were lower in exudates than in external solutions suggesting a selectivity mechanism in the root. These experiments demonstrated that both Si and P transport require metabolic energy
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