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S Tarigan

Publications and source records attributed to S Tarigan.

14 recordsLinked to original sources
PubMed1996

Characterisation of haemolytic RTX toxins produced by Australian isolates of Actinobacillus pleuropneumoniae.

The haemolytic RTX toxins of 27 isolates of Actinobacillus pleuropneumoniae, representing all serovars that have been isolated in Australia, were characterised. The quantity of protein secreted by these isolates into the media was not significantly different between serovars, but haemolytic activity was detected only in the unconcentrated supernatants from cultures of serovar 1 and 5 isolates. Haemolytic activity in supernatants of serovar 2, 3 and 7 isolates was detected only after the supernatants were concentrated. On Southern hybridisation blots, genomic DNA of serovar 1 and 5 isolates contained regions that were similar to the cloned structural genes for ApxI (apxIA) and for ApxII (apxIIA). In contrast, genomic DNA of serovar 2, 3 and 7 isolates only contained regions similar to, if not identical with, the cloned apxIIA gene. The haemolytic activity of the culture supernatant depends on the type or composition of media and adaptability of the bacteria to in-vitro cultivation. Low passage cultures of A pleuropneumoniae, which were characterised by waxy colonies, produced significantly weaker haemolytic activity than A pleuropneumoniae after several passages in vitro.

Actinobacillus Infections↗
PubMed1994

Functional and structural changes of porcine alveolar macrophages induced by sublytic doses of a heat-labile, hemolytic, cytotoxic substance produced by Actinobacillus pleuropneumoniae.

Alterations in the size and functions of porcine alveolar macrophages exposed to sublytic amounts of heat-labile, hemolytic cytotoxin produced by Actinobacillus pleuropneumoniae (App) serotype 1, strain HS54 into the culture medium were studied in vitro. Alveolar macrophages were sensitive to the cytotoxin; treatment of the macrophages with low concentrations of cytotoxin (0.016 hemolytic unit) resulted in severe, irreversible cell swelling. However, high doses of cytotoxin (2.0 hemolytic units) were required to cause substantial cell death, as indicated by the influx of propidium iodide into and release of lactate dehydrogenase from cells. Macrophages exposed to low, sublytic doses of cytotoxin failed to migrate toward chemoattractant, were unable to attach to glass, and failed to phagocytize optimally opsonized erythrocytes. Macrophages already attached to glass surfaces detached when exposed to sublytic doses of cytotoxin. The swelling and impairment of functions of alveolar macrophages observed in this study could not be attributed to endotoxic effects, because heat treatment of the cytotoxin preparation for 60 minutes at 60 C resulted in complete loss of cytotoxicity. We conclude that sublytic doses of heat-labile, hemolytic cytotoxic substances produced by App depress alveolar macrophage function at concentrations likely to develop in association with acute pulmonary infection with App. The Apx (A pleuropneumoniae Rtx toxins) exotoxins secreted by the bacteria into culture medium were considered responsible for the toxic activity of the cytotoxin preparation. The Apx of the App field strain used in this study were likely to be similar to those of serotype-1 reference strain (S4707). Analysis by use of DNA-DNA hybridization indicated that genomic DNA of the field strain contained sequences similar to those encoding structural protein of ApxI (apxIA) and ApxII (apxIIA) of the serotype-1 reference strain. Therefore, Apx produced by the field strain of App used in this study are likely to be of similar pathogenic importance worldwide.

Actinobacillus pleuropneumoniae↗
PubMed1990

Genital pathology of feral male goats.

Genitalia from 1000 feral male goats derived from western Queensland and New South Wales were examined after slaughter at an abattoir and the prevalence of abnormalities determined. Ulcerative balanoposthitis, considered due to caprine herpesvirus infection, was observed in 11 animals (1.1%); acidophilic intranuclear inclusions were found in 7 of these. Other conditions included focal hypoplasia of seminiferous tubules in 2 bucks (0.2%), segmental aplasia of the epididymis (one buck, 0.1%), bulbourethral gland cysts with contained aggregations (33 bucks, 3.3%) and haemangiosarcoma of the bulbourethral gland in one animal. The low prevalence of several conditions such as spermatic granuloma, cryptorchidism, and testicular hypoplasia, was attributed largely to the fact that the bucks examined were horned so that the recognised association between genital abnormalities and polledness did not apply.

Abattoirs↗
PubMedDate not supplied

Ichthyosis fetalis.

Explore the source record for details and available documents.

Adult↗
PubMedDate not supplied

Clinical features of severe malnutrition at the pediatric ward of Dr. Pirngadi Hospital Medan.

A retrospective study on severe malnutrition concerning children hospitalized at the Pediatric ward of Dr. Pirngadi Hospital, Medan from January 1 to December 31, 1988 was conducted. Patients less than five years old were included in this study. The purpose of this study was to know the incidence of severe malnutrition, its symptoms and signs, the immunization status, feeding pattern and socio-economic factors. Out of the 3370 hospitalized patients, 2453 (72.78%) were children under five years old. Of these, 312 (12%) suffered from severe malnutrition. It consisted of marasmus 131 (41.9%), marasmic kwashiorkor 94 (30.1%) and kwashiorkor 87 (27.8%). The highest incidence was found in the age group of 0-2 years (58%). Clinical manifestation of marasmus were old man face (131 or 100%), muscular hypotrophy (118 or 71.9%) and decreased subcutaneous fat (116 or 71.1%) in marasmic kwashiorkor children 46 or 50% had their hair easily picked out, 45 or 46.3% showed hyperpigmentation and 48 or 52% had pretibial edema in the kwashiorkor group 29 or 63% had moon face, 52 or 60.4% showed crazy pavement dermatosis, 77 or 51.3% had hepatomegaly and 87 or 48% pretebial edema. Moon face was seen in 29 (63%), crazy Pavement Dermatosis in 52 (60.4%), hepatomegaly in 77 (51.3%), and pretebial edema in 87 (48%) of kwashiorkor cases. The accompanying diseases were mostly diarrhea (95%) and bronchopneumonia (22%). Immunization status showed that BCG comprised 50.6%, while DPT III and OPV III in 13.7% and 10.5% respectively and measles only 0.64%. More than half (59.6%) of them were breast-fed up to 6 months.(ABSTRACT TRUNCATED AT 250 WORDS)

Child, Preschool↗