41 research outputs found
Mitochondrial diversity analysis of Glossina palpalis gambiensis from Mali and Senegal
West African riverine tsetse populations of Glossina palpalis gambiensis Vanderplank (Diptera: Glossinidae) were investigated for gene flow, inferred from mitochondrial diversity in samples of 69 flies from Senegal and 303 flies from three river drainages in Mali. Four polymorphic mitochondrial loci were scored. Mean haplotype diversities were 0.30 in Mali and 0.18 over both Mali and Senegal. These diversities estimate the probabilities that two randomly chosen tsetse have different haplotypes. Substantial rates of gene flow were detected among flies sampled along tributaries belonging to the river basins of the Senegal, Niger, and Bani in Mali. There was virtually no gene flow between tsetse in Senegal and Mali. No seasonal effects on gene flow were detected. The implications of these preliminary findings for the implementation of area-wide integrated pest management (AW-IPM) programmes against riverine tsetse in West Africa are discussed
A cyclic universe with colour fields
The topology of the universe is discussed in relation to the singularity
problem. We explore the possibility that the initial state of the universe
might have had a structure with 3-Klein bottle topology, which would lead to a
model of a nonsingular oscillating (cyclic) universe with a well-defined
boundary condition. The same topology is assumed to be intrinsic to the nature
of the hypothetical primitive constituents of matter (usually called preons)
giving rise to the observed variety of elementary particles. Some
phenomenological implications of this approach are also discussed.Comment: 21 pages, 9 figures; v.4: final versio
Thrust prediction in thermally choked ram accelerator
International audienc
Tunneling of an energy eigenstate through a parabolic barrier viewed from Wigner phase space
We analyze the tunneling of a particle through a repulsive potential
resulting from an inverted harmonic oscillator in the quantum mechanical phase
space described by the Wigner function. In particular, we solve the partial
differential equations in phase space determining the Wigner function of an
energy eigenstate of the inverted oscillator. The reflection or transmission
coefficients or are then given by the total weight of all classical
phase space trajectories corresponding to energies below, or above the top of
the barrier given by the Wigner function