Development of the sugar beet cyst nematode, Heterodera schachtii, was studied in growth chambers at 20, 25, 29, 32 and 35 ± 1 oC on Beta vulgaris cv. Saccharifera. The optimum temperature for reproduction appeared to be 32 oC, at which the life cycle, from second-stage juvenile (J2) to J2, was completed in 16-19 days; at 35 oC, 20-21 days were required. Juveniles emerged from eggs within 29 da...

Second-stage juveniles (I2) of Meloidogyne arenaria consumed more oxygen (P </= 0.05) than M. incognita J2, which in turn consumed more than M. javanica J2 (4,820, 4,530, and 3,970 mul per hour per g nematode dryweight, respectively). Decrease in oxygen consumption depended on the nematicide used. Except for aldicarb, there was no differential sensitivity among the three nematode species. Meloi...

We calculate the quantum phase diagram of the XXZ chain with nearestneighbor (NN) J1 and next-NN exchange J2 with anisotropies ∆1 and ∆2 respectively. In particular we consider the case ∆1 = −∆2 to interpolate between the XX chain (∆i = 0) and the isotropic model with ferromagnetic J2. For ∆1 < −1, a ferromagnetic and two antiferromagnetic phases exist. For |∆i| < 1, the boundary between the di...

A two-layer Heisenberg antiferromagnet is studied as a model of the bilayer cuprate YBa2Cu3O6. Quantum Monte Carlo results are presented for the temperature dependence of the spin correlation length, the static structure factor, the magnetic susceptibility, and the 63Cu NMR spin-echo decay rate 1/T2G. As expected, when the ratio J2/J1 of the intrabilayer and in-plane coupling strengths is small...

We report magnetization and specific-heat measurements on polycrystalline samples of BaCdVO PO4 2 and show that this compound is a S=1 /2 frustrated square lattice with ferromagnetic nearest-neighbor J1 and antiferromagnetic next-nearest-neighbor J2 interactions. The coupling constants J1 −3.6 K and J2 3.2 K are determined from a fitting of the susceptibility data and confirmed by an analysis o...

Meloidogyne incognita is a plant-parasitic nematode which attacks a diverse variety of plants (Mitkowski and Abawi, 2003). The life cycle of this nematode is comprised of five stages namely eggs, J2, J3, and J4 juveniles and adults. Female adults are important in the life cycle as they produce eggs which hatch into infective J2 that travels and attaches to plant roots for continuation of its in...

Anguina pacificae is distributed along a narrow strip on the Pacific coast of Northern California where it forms galls on the shoots of Poa annua and causes significant damage to golf course greens. Methods were developed for the continuous propagation of A. pacificae on P. annua in growth chambers, and they were used to examine the life cycle and host-parasite relationships of the nematode. At...

The notions of the crossed product and the braided category are discussed within the theory of C∗-algebras. Like in the purely algebraic approach of S. Majid these notions are used to generalize the quantum group theory. We give an example of a braided group. It coincides with the closed subset C = {z : |z| = . . . , q−2, q−1, 1, q, q2, . . . , 0} of the complex plane equipped with the q2braidi...

The northern root-knot nematode, Meloidogyne hapla, is one of the most important nematode pathogens occurring in cold regions. It is a sedentary, biotrophic parasites of plants and overwinter in the soil or in diseased roots. This study showed that the cold tolerance for the second-stage juveniles (J2) of M. hapla was moderate with the 50% survival temperature (S50) of -2.22°C and the fatal tem...

This paper deals with bases in a finite–dimensional Hilbert space. Such a space can be realized as a subspace of the representation space of SU2 corresponding to an irreducible representation of SU2. The representation theory of SU2 is reconsidered via the use of two truncated deformed oscillators. This leads to replace the familiar scheme {j2, jz} by a scheme {j2, vra}, where the two–parameter...