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- Kate C. Cummings, Eimear Barrett, +7 authors Lawrence Slutsker
- Emerging infectious diseases
- 2001

Salmonella enterica serotype Baildon, a rare serotype, was recovered from 86 persons in eight states; 87% of illnesses began during a 3-week period ending January 9, 1999. Raw restaurant-prepared tomatoes were implicated in multiple case-control studies. Contamination likely occurred on the farm or during packing; more effective disinfection and prevention… (More)

- Takashi Fukuda, Keiichi Komatsu
- Math. Comput.
- 1996

We give a sufficient condition in order that an ideal of a real quadratic field F capitulates in the cyclotomic Z3-extension of F by using a unit of an intermediate field. Moreover, we give new examples of F ’s for which Greenberg’s conjecture holds by calculating units of fields of degree 6, 18, 54

- Takashi Fukuda, Keiichi Komatsu
- Experimental Mathematics
- 2009

- Takashi Fukuda, Keiichi Komatsu
- Math. Comput.
- 2000

There has been important progress in constructing units and Sunits associated to curves of genus 2 or 3. These approaches are based mainly on the consideration of properties of Jacobian varieties associated to hyperelliptic curves of genus 2 or 3. In this paper, we construct a unit group of the ray class field k6 of Q(exp(2πi/5)) modulo 6 with full rank by… (More)

- Takashi Fukuda, Keiichi Komatsu
- ANTS
- 2002

We study the Iwasawa λ-invariant of the cyclotomic Z2-extension of Q( √ p ) for an odd prime number p which satisfies p ≡ 1 (mod 16) relating it to units having certain properties. We give an upper bound of λ and show λ = 0 in certain cases. We also give new numerical examples of λ = 0.

- Takashi Fukuda, Keiichi Komatsu
- Math. Comput.
- 2009

For certain cyclic cubic fields k, we verified that Iwasawa invariants λ3(k) vanished by calculating units of abelian number field of degree 27. Our method is based on the explicit representation of a system of cyclotomic units of those fields.

- Takashi Fukuda, Keiichi Komatsu
- Experimental Mathematics
- 2002

- Y KANHARA, R KOKURI, Etsuko Ichikawa, T ASHITATSU, Keiichi Komatsu
- [Chiryō] [Therapy]
- 1962