Lulwoana sp., a dark septate endophyte in roots of Posidonia oceanica (L.) Delile seagrass.

Posidonia oceanica is the most common, widespread and important monocotyledon seagrass in the Mediterranean Basin, and hosts a large biodiversity of species, including microorganisms with key roles in the marine environment. In this study, we ascertain the presence of a fungal endophyte in the roots of P. oceanica growing on different substrata (rock, sand and matte) in two Sicilian marine meadows. Staining techniques on root fragments and sections, in combination with microscope observations, were used to visualise the fungal presence and determine the percentage of fungal colonisation (FC) in this tissue. In root fragments, statistical analysis of the FC showed a higher mean in roots anchored on rock than on matte and sand. In root sections, an inter- and intracellular septate mycelium, producing intracellular microsclerotia, was detected from the rhizodermis to the vascular cylinder. Using isolation techniques, we obtained, from both sampling sites, sterile, slow-growing fungal colonies, dark in colour, with septate mycelium, belonging to the dark septate endophytes (DSEs). DNA sequencing of the internal transcribed spacer (ITS) region identified these colonies as Lulwoana sp. To our knowledge, this is the first report of Lulwoana sp. as DSE in roots of P. oceanica. Moreover, the highest fungal colonisation, detected in P. oceanica roots growing on rock, suggests that the presence of the DSE may help the host in several ways, particularly in capturing mineral nutrients through lytic activity.

A polyphasic approach to the identification of ochratoxin A-producing black Aspergillus isolates from vineyards in Sicily.

Aspergillus strains belonging to section Nigri isolated during a two year survey in eight Sicilian vineyards located on the slopes of Mount Etna (Sicily, Italy) were analysed analyzed in order to characterize species responsible for ochratoxin A (OTA) contamination of grapes. The polyphasic approach permitted analysis of biodiversity of Aspergillus isolates in relation to their morphology, ochratoxigenicity and genetic variability. We assessed OTA production by A. carbonarius, A. niger, A. tubingensis and A. japonicus using an enzyme-linked immunosorbent assay. A. carbonarius isolates were the strongest OTA producers. A subset of 66 representative strains was selected for further DNA-based characterization. PCR assays using species-specific primers discriminated between A. niger, A. carbonarius and A. japonicus on the basis of the target sequences for each species. The PCR-based methods matched morphological characterization in identifying all the black aspergilli (BA) isolates tested, whereas RFLP analysis with RsaI of isolates positive to PCRs with A. niger specific primers identified three A. tubingensis isolates. The identification of thirteen isolates was further confirmed by ITS analysis. By this method, each of the isolates was identified and assigned to an Aspergillus species. The fAFLP analysis of 40 isolates highlighted the power of this technique to discriminate different species and single strains, to verify the presence of mixed populations in the same vineyard, through homogeneous species clusters. No correlation was observed between the clusters and OTA production level or origin.

Synthesis and antifungal activity of new N-isoxazolyl-2-iodobenzamides.

N-Isoxazolyl-2-iodobenzamides 3 and 9, with a benodanil-like structure, were synthesized by refluxing in acetic acid the corresponding benzotriazinones 2 and 8 with potassium iodide for 1 h with the aim to ascertain if they were active as fungicides against Phytophthora citricola Saw., Botrytis cinerea Pers., Rhizoctonia sp. and Alternaria sp. Among the tested iodo derivatives, compounds 3b and 9a possess interesting activities against the aforesaid fungal strains in several cases similar to that of benodanil I taken as reference drug.

[Hemorrhage caused by vitamin K deficiency in the post-natal period]. / L'emorragia da deficit di vitamina K in epoca post-neonatale.

The paper describes 8 cases of delayed haemorrhagic disease caused by vitamin K deficiency, occurring from 16 days to 3 months after birth and observed in 1982-87. All these infants were breast fed and had received no vitamin K prophylaxis. On the basis of these findings, the preventive role of vitamin K in breast fed infants is emphasised.

[Amoxicillin and clavulanic acid suspension for children in the treatment of bronchopulmonary infections]. / Amoxicillina ed acido clavulanico sospensione pediatrica nel trattamento di infezioni broncopolmonari.

The present study has been tested on 30 children, 14 males and 16 females, average age 4.11 +/- 0.44 (range 9 months to 10 years), weight of 17.08 +/- 1.25 Kg, with infections concerning low respiratory tract (8 cases of broncho-pneumonia, 9 cases of acute bronchitis and 13 cases of lobar pneumonia). It has been used a chemotherapy composed of amoxycillin and clavulanic acid in pediatric suspension of 312.5 mg/5 ml (in the ratio of 4 to 1); the daily dosage, related to the children's weight has been of 43.91 +/- 1.21 mg/Kg in two daily doses. On the average the therapy has lasted for 6.43 +/- 0.19 days from a minimum of 4 to a maximum of 8 days. During the treatment the symptomatologic parameters (dyspnoea, cough), and the objective ones (pathological lung signs, rales, hypophonesis, bronchial breath...) have progressively improved till they have disappeared; morning and evening body temperature has promptly returned to normal. Both the physical and radiological exams of the chest confirm either the improvement or the regression of the infection in most of the cases. Side effects due to the antibiotic have not been registered and local and general tolerability was excellent. Considering the more or less fast and complete symptomatological regression, the evolution of the infective clinical picture and the tolerability, the final evaluations have been: excellent efficacy in 13 cases, good efficacy in 9 cases, fairly good in 5 cases and poor in 3 cases.