A serotypic survey and cross-protection test of North American field isolates of Yersinia ruckeri

Abstract. A serological study of 23 North American strains of Yersinia ruckeri showed that they were comprised essentially of one serotype–the classical 'Hager-man' serotype. Cross-protection tests showed that rainbow trout could be protected from challenge with various strains. Continuous surveillance of enteric redmouth disease and further work including DNA binding studies is necessary to determine the precise significance of the other related serotypes.     

樱类品种观赏性状初步研究

以宁波仗锡樱花基地引种的15个樱类品种为试材,研究其在宁波地区的开花物候期和观赏性状表现。结果表明:在宁波露地栽植条件下,多数品种的始花期集中在3月下旬—4月中旬,各品种单株花期12～21 d不等,总花期维持20～35 d之间。始花期以东京樱最早,虎尾樱最晚,红叶樱、冈目、关山较晚;花期以关山最长,八重红大岛次之,虎尾樱最短。重瓣品种中白菊樱、关山、八重红大岛和普贤象花大、色艳、花型美丽、花量大、植株健壮;单瓣品种中一叶樱、染井吉野和东京樱花量大、开花时间早、生长势好,可推广种植。     

Uterine adenomyosis in an orang-utan (Pongo abelii/pygmaeus)

A 48-year-old, multiparous, female hybrid orang-utan ( Pongo abelii/pygmaeus ) was investigated after a 3-year history of irregular and excessively heavy menstrual bleeding. Opportunistic pelvic examinations over a 2.5-year period were non-diagnostic. Medical therapy was not effective. A subtotal hysterectomy with bilateral salpingo-ovariectomy was performed. A pedunculated mass spanning 90% of the uterine lumen was seen grossly, and histopathology confirmed uterine adenomyosis. Adenomyosis is defined as the ectopic occurrence or diffuse implantation of endometrial tissue, including glands and stroma, into the myometrium. It is common in older, usually premenopausal, multiparous women and is frequently associated with other uterine pathology, including endometrial hyperplasia and leiomyomas. The most common clinical signs are dysmenorrhoea and heavy menstrual bleeding; however, up to 35% of women are asymptomatic. Diagnosis is difficult and requires myometrial sampling and an experienced pathologist. A hysterectomy in this case was diagnostic and curative. There have been few reports of uterine adenomyosis in non-human primates and none reported in an orang-utan. Uterine adenomyosis should be considered in the differential diagnosis in any multiparous, aged, non-human female primate with irregular and excessively heavy menstrual bleeding, and hysterectomy with bilateral salpingo-ovariectomy is recommended as a diagnostic and therapeutic solution.     

Genetic analysis of resistance to Puccinia striiformis in the wheat differential cultivars Heines VII, Heines Peko and Strubes Dickkopf

One major gene for resistance to isolate WYR 85-22 of race 6E0 of Puccinia striiformis was identified by genetic analysis of the differential cultivars Heines Peko, Strubes Dickkopf and Heines VII. This gene was different from Yr2 Yr6 already identified in Heines Peko ( Yr2 Yr6 ) and Heines VII ( Yr2 ), was allelic in the three cultivars and also to a gene expressed in the other differentials Reichersberg 42 ( Yr7 ) and Clement ( Yr9 ). In Heines Peko, Strubes Dickkopf and Heines VII, a minor gene was also postulated, which, it is proposed, gave only a low level of resistance by itself but strengthened the expression of the major gene when the latter was homozygous or heterozygous. The genetics of the resistance was analysed using six resistance classes and applying multidimensional analyses. The number of resistance genes was hypothesized using data from F3 families from crosses between the three differentials and the cultivar Heines Kolben, which is susceptible to this race.     

美国路易斯安那州铁矿石土壤薄层磐层的表征特性

Placic horizons, defined as thin, wavy, hardened layers of iron and organic matter, are rare within the United States, occurring only in Washington, Alaska, and Hawaii. While ironstone is common in many soils of the southeastern United States, it is not known to contain appreciable organic matter. As a pilot study evaluating the justification for a larger study on ironstone in Louisiana, a 40 m lateral exposure with suspected placic horizons was evaluated in Vernon Parish, Louisiana. Results of laboratory analysis show elevated levels of iron and organic matter in the suspect horizons that meet the criteria of placic horizons as defined by the Soil Survey Staff. Based on the results of this study, additional evaluation of multiple pedons with similar features is warranted. Should additional pedons demonstrate similar properties, a new great group of ‘Petrudepts’ would be needed to describe both the placic horizons in the pedon and the udic moisture regime in which they occur.