the harmonic index h(g) , of a graph g is defined as the sum of weights 2/(deg(u)+deg(v)) of all edges in e(g), where deg (u) denotes the degree of a vertex u in v(g). in this paper we define the harmonic polynomial of g. we present explicit formula for the values of harmonic polynomial for several families of specific graphs and we find the lower and upper bound for harmonic index in caterpill...

Although some clades of ribbon worms (phylum Nemertea) are consistently recovered with high support in molecular phylogenies, the placement and inter-relationships of some taxa have proven problematic. Herein, we performed molecular phylogenetic analyses aimed at resolving these recalcitrant splits, using six loci (nuclear 18S rRNA, 28S rRNA, histones H3 and H4, and mitochondrial 16S rRNA and C...

According to Kutscher and Ackermann (l-3), there is a very marked difference between vertebrate and invertebrate animals in that the latter do not contain creatine, but, in its place, arginine. After t,he discovery of creatine phosphoric acid by Fiske a,nd Subbarow (4,5) and by Eggleton and Eggleton (B), it became of interest to see whether arginine in invertebrate muscle was similarly present ...

UNLABELLED Myxosporeans (Myxozoa), microscopic metazoan parasitic organisms, are poorly studied in the Arctic region. Our survey of benthic and pelagic fish (n = 234) collected in Isfjorden (Svalbard, Norway) together with detailed morphological and molecular examination revealed the presence of nine myxosporean species. We compared observed myxosporean diversity with diversity documented in re...

We build a hybrid model of the aggregate labor market that features both standard labor supply forces and frictions in order to study the cyclical properties of gross worker flows across the three labor market states: employment, unemployment, and nonparticipation. Our goal is to assess the relative importance of frictions and labor supply in accounting for fluctuations in labor market outcomes...

What are the effects of unconventional monetary policies during panic-based financial crises? To address this question, I develop a dynamic general equilibrium model of banking. A novel mechanism gives rise to multiple equilibria. In the good equilibrium, all banks are solvent. In the bad equilibrium, many banks are insolvent and subject to runs. The bad equilibrium is also characterized by def...

This paper analyzes how the interaction between …rms’entry-and-exit decisions and variations in competition gives rise to self-ful…lling, expectation-driven ‡uctuations in aggregate economic activity and in measured total factor productivity (TFP). The analysis is based on a dynamic general equilibrium model in which net business formation is endogenously procyclical and leads to endogenous cou...