ALBERT

Notes: Peruvian carrot soft rot occurs quite frequently in Minas Gerais State, Brazil, either under field conditions or after harvested roots have been stored. The etiology of the disease was investigated and the disease was found to be induced by Erwinia carotovora. This appears to be the first report of this disease.

Notes: Tanier spinach (Xanthosoma brasiliense, Araceae) is a common leafy vegetable in south-eastern Brazil. A cuneiform leaf blight which started at the edges of leaves and resulted in complete leaf decay has recently been observed. The causal agent was identified as Pseudomonas cichorii. This appears to be the first report of the disease.

Notes: The purpose of this paper is to shed new light on the consistent aggregation problem in input-output systems by making use of some properties of M-matrices. For example, we show that the stability of a multisectoral dynamic multiplier model is invariant under consistent aggregation, that a consistently aggregated dynamic Leontief model is relatively stable if the original system is stable, and that Gillen and Guccione's Third Proposition can be generalized to cover the case of weighted aggregation.

Notes: The abdominal muscle tissues of giant river prawn, fleshy prawn and spiny lobster contained 2.4–2.6% collagen of the total tissue protein. Alkali-insoluble proteins were prepared from the muscle tissues by treatment with 0. 1N NaOH at 4°C and found to exhibit the amino acid composition typical of collagen. The muscle collagens, consisting of α chain-sized components, were then isolated by limited pepsin digestion and characterized by a high content of hydroxylysine and its glycoside and a low content of alanine. In addition, subcuticular membranes covering the muscle tissues were found to be comprised mainly of such an alkali-insoluble collagen.

Notes: Two different types of T cell clones which recognize Mlsb haplotype gene products were established by using mice congenic at the Mls locus. The antigens defined by these T cells showed differences not only in strain distribution but also in the restriction element for antigen recognition by T cells (i.e. Kd or Dd). The antigens appear to be expressed on various types of lymphocytes.

Notes: To investigate HLA-linked genes controlling the susceptibility and resistance to insulin dependent diabetes mellitus (IDDM), HLA-DQ alleles of 45 Japanese patients with IDDM were analysed, using sequence specific oligonucleotide (SSO). DQA1*0301 and DQBI*04 were positively associated (R.R = 6.6, Pc〈0.05 and R.R. = 4.7 Pc〈0.01) and DQAI*0103 and DQBI*0104 were negatively associated (R.R. =0–2, Pc〈0.01) with IDDM. DQAI*0103 and DQB1*0104 were in strong linkage disequilibrium to encode for DQw6 molecule. Therefore, in a Japanese population, the DQw6 molecule seems to control the resistance to IDDM. To determine whether or not the DQw6 molecule itself can protect against glycosuria and insulitis in NOD mice, these animals were mated with HLA-DQw6 transgenic-C57BL/6 mice (DQw6-B6) and the F1 progeny expressing the DQw6 molecule were backcrossed with NOD mice. Eighty-five female backcross progenies were classified into four groups, according to the MHC classII phenotype; I-Anod/I-Anod DQw6(-), I-Anod/I-Anod DQw6(+), I-Anod/I-Ab DQw6(-) and I-Anod/I-Ab DQw6(+). At the age of 16 weeks, 9.1% of the DQw6(-) I-Ab(-) mice had a glycosuria whereas none of the DQw6(+) I-Ab(-) mice had a glycosuria. At the age of 30 weeks 13.6% of the DQw6(-) I-Ab(-) mice had a glycosuria and 7.7% of the DQw6(+) I-Ab(-) mice had a glycosuria. Histological examinations of the pancreas were performed in the 30 week old mice or after the development of glycosuria. About 50% of I-Ab(-) mice developed insulitis, regardless of the expression of the DQw6 molecule. Thus, the DQw6 molecule seemed to delay the onset of glycosuria but did not protect against glycosuria and insulitis in the NOD mice despite a functional expression.

Notes: Muscle Type I collagen of five teleosts was characterized with respect to its thermal stability and subunit composition. The muscle collagen exhibited a higher denaturation temperature, Td, in solution and a higher degree of proline hydroxylation, compared with skin Type I collagen of the respective species. Moreover, the Td values seemed to increase with the increasing upper limit of environmental temperature of fish habitats. The subunit composition also varied with fish species; an α1α2α3 heterotrimer existed in eel and common mackerel and an (α1)2α2 heterotrimer in saury, while (α1)2α2 and α1α2α3 heterotrimers appeared to be major and minor components, respectively, in chum salmon and carp.

Notes: This study has defined five brachiopod assemblage zones within the Permian Kapp Starostin Formation of Festningen, Central West Spitsbergen. They are designated as the Horridonia timanica zone, the Waagenoconcha sp. A (Gobbett 1964) zone, the Megousia weyprechti zone, the Plerospirifer alatus zone and the Haydenella wilczeki zone in ascending order. Only the lower three zones are recognized in the same formation of Sveltihel.The first zone, which is exactly equivalent to the 'Spirifer Limestone’as well as the Vøringcn Member of the Kapp Starostin Formation, is probably Kungurian in age. The last zone, situated near the uppermost portion of the Hovtinden Member, may possibly have a brachiopod assemblage matching that of the Cyclolobus-bearing beds of the Foldvik Creek Formation in Central East Greenland. Consequently, the uppermost beds of the Kapp Starostin Formation are chronologically dated as late Permian, most probably as Dzhulfian of the Tethys Province.

Notes: Water samples collected from raceway of salmonid hatcheries in Japan in each of the four seasons were compared for their capability to reduce the infectivity titres of infectious hematopoietic necrosis virus (IHNV) and infectious pancreatic necrosis virus (IPNV).The titre of IHNV was reduced at 15 °C to less than detectable limits within 3 days using untreated samples of water and samples of water containing sedimenis. Little reduction of infectivity of IPNV was observed in all water samples. No reduction of infectivity was noted for either virus using bacteria-free water treated by filtration or autoclaving. Results were similar with the water obtained during each season. After incubation of the samples, the nu̇mber of viable bacteria increased 102–103-fold. Members of the genus Pseudomonas were mosl predominant in the water and sediment samples.Bacteria isolated from the water collected from a salmonid hatchery in spring, 1984 were screened for anti-IHNV activity.Three of 25 isolates showed anti-IHNV activity (plaque reduction of more than 50 %) in the culture filtrates, including one Pseudomonas strain showing potenl anti-IHNV activity (99 % plaque reduction).〈section xml:id="abs1-2"〉〈title type="main"〉ZusammenfassungDer Einfluß des Fischhälterungswassers auf die Infektiosität des Virus der infektiösen haematopoetischen Nekrose (IHNV) und des Virus der Pankreasnekrose (IPNV)Saisonal entnommene Wasserproben aus Forellenzuchtbetrieben in Japan wurden hinsichilich ihrer inaktivierenden Wirkungen auf das Virus der haematopoetischen Nekrose (IHNV) und das Virus der Pankreasnekrose (IPNV) untersucht. Während unbehandelte Wasserproben und Wasserproben mit Sedimenl die Infektiosität des IHNV bei 15 °C fast völlig innerhalb 3 Tagen reduzierten, erwies sich die Infekliosität des IPNV als relaliv stabil. Innerhalb der Inkubationszeit von 14 Tagen stieg die Anzahl der Bakterien in den Wasserproben 100–1000fach an. Baklerien des Genus Pseudomonas waren predominant. 3 von 25 Bakterienisolaten zeigten IHNV inaktivierende Wirkungen bis zu 50%. Bin Pseudo-monastamm inaktivierte das Virus bis zu 99%. Mit bakierienfrei filtriertem bzw. autoklaviertem Wasser wurden keine Virustiterreduktionen beobachtet.〈section xml:id="abs1-3"〉〈title type="main"〉RésuméInfluence tie I'eau environnante sur les infectiosités du virus de la nécrose infectieuse de I'hématopoïèse (IHNV) et du virus de la nécrose infectieuse du pancréas (IPNV)Des prélèvements d'eau faits chaque saison dans des écloseries de salmonidés au Japon ont été comparés quant à leur possibilité de réduireles titres d'infectiosité du virus de la nécrose infectieuse de l'hémalopo-ïèse (IHNV) el du virus de la nécrose infectieuse du pancréas (IPNV). En l'espace de trois jours le titre de IHNV a été réduil à 15°C à un degré en dessous de la limite de déiection á l'aide de prélèvemenis d'eau non-iraités et de prélèvements d'eau contenant des sédimenis. Une petite réduction de l'infectiosité de IPNV a été constatée dans tous les prélèvements d'eau. L'utilisalion d'eau sans bactérie, traitée par filtration ou autoclave, n'a apportée aucune reduction de l'infectiosilé des virus. Les résuliats étaient semblables avec l'eau recueillie chaque saison. Après une incubation des prélèvements, le nombre de bactéries viables a augmenté de 100 à 1000 fois. Les membres du genre Pseudomonas prédominaient dans les prélèvments d'eau et de sédiment. Les bactéries isolées de l'eau prélevée dans une écloserie de salmonidés au printemps 1984 ont été examinées quant à leur activité conlre le IHNV. 3 des 25 bactéries isolées montraient une activité anti-IHNV (réduction des plaques de plus de 50%) dans les filtrats de culture, y compris une souche de Pseudomonas montrant une activité anti-IHNV efficace (réduction des plaques 99%).

Notes: The impact fatigue crack growth characteristics of a low carbon steel and an aluminium alloy were studied. An impact fatigue testing machine of the Hopkinson bar type was used in these experiments to conduct a series of crack growth tests under simple impact stresses.The following characteristics of impact fatigue crack growth behaviour were revealed: (1) crack growth rate is higher in impact fatigue than in non-impact fatigue; (2) crack opening ratio in impact fatigue takes a higher value than in non-impact fatigue; (3) crack tip plastic zone size is smaller in impact fatigue than in non-impact fatigue.