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It is shown that solvable mixed spin ladder models can be constructed from su(N) permutators. Heisenberg rung interactions appear as chemical potential terms in the Bethe Ansatz solution. Explicit examples given are a mixed spin-1 2 spin-1 ladder, a mixed spin-1 2 spin-3 2 ladder and a spin-1 ladder with biquadratic interactions.

T h e antibodies that are p roduced in man as a result of specific vaccination or infectious disease comprise only a small propor t ion o f the bulk o f the IgG molecules circulating in the blood. T h e immunity towards these antigens is a t t r ibuted mostly to a relatively high n u m b er o f memory cells and a low titer o f synthesized antibodies. In view of kinetic studies o f ant ibody pro...

Objective: The authors examined the relationship between deficits in olfactory identification and duration of illness in young and elderly patients with schizophrenia. Method: Olfactory identification performance of 38 patients with schizophrenia and 40 normal subjects was compared by using the University of Pennsylvania Smell Identification Test. Results: The schizophrenic patients demonstrate...

Seueral techniquesare available for implementingascalardigitaffilter using lattice and ladder structures which are known to yield low noise realizations. Ofthese, the lattice and ladder structures proposed by Gray and Markel have the advantage of being interimlly scaled Block implementation of a scalar digitalfilteroflers a number of advantages. Inthis pnpet, new algorithms to realize block dig...

Ladder inclined angle is a critical factor that could lead to a slip at the base of portable straight ladders, a major cause of falls from heights. Despite several methods established to help workers achieve the recommended 75.5° angle for ladder set-up, it remains unclear if these methods are used in practice. This study explored ladder set-up behaviours in a field environment. Professional in...

BRUCE E. DUNN,* HARTLEY COHEN, AND MARTIN J. BLASER Department of Pathology, Medical College of Wisconsin, Milwaukee, Wisconsin 53226-0509; Pathology and Laboratory Medicine Service, Clement J. Zablocki Veterans Affairs Medical Center, Milwaukee, Wisconsin 53295-1000; Gastroenterology and Liver Diseases Division, Department of Medicine, University of Southern California School of Medicine, Los ...

For population biologist Bruce Levin, opening the incubator to see how yesterday’s experiment worked is his ideal way to start the day. That anticipation has kept the Emory University professor of biology excited about his research on the population and evolutionary biology of bacteria for more than 40 years, and motivated a shift in interest from multicellular organisms to bacteria. Anything t...

A ladder lottery, known as the “Amidakuji” in Japan, is a common way to choose an assignment randomly. Formally, a ladder lottery of a permutation π = (p1, p2, . . . , pn) is a network with n vertical lines (lines for short) and many horizontal lines (bars for short) as follows (see Fig. 1). The i-th line from the left is called line i. The top ends of the n lines correspond to π. The bottom en...