Showing papers by "University of Peradeniya published in 1981"
136 citations
TL;DR: It is suggested that the consumption of herbal medicines that contain pyrrolizidine alkaloids could contribute to the high incidence of chronic liver disease including primary hepatocellular cancer in Asian and African countries.
66 citations
TL;DR: An outbreak of acute polyneuropathy affected over 20 young females in Sri Lanka during 1977-78 and could be traced to tri-cresyl phosphate found as a contaminant in gingili oil.
44 citations
TL;DR: In this paper, a model for the origin of graphite occurrences in Sri Lanka is discussed in the light of recent views on the geologic history of Sri Lanka, where the authors show that the source of carbon of all three types is organic matter from microorganisms now known to have lived in Precambrian sedimentary basins.
38 citations
TL;DR: Peat can be used as a material that can trap metals from an aqueous solution and can easily be desorbed as mentioned in this paper, this useful property of peat makes it a valuable material that could be used to trap metal from industrial waste matter.
Abstract: Peat can be used as a material that can trap metals from an aqueous solution and can easily be desorbed. This useful property of peat makes it a valuable material that can be used to trap metals from industrial waste matter that can cause environmental pollution. It was found that in the presence of Na+ ions the adsorption of metal ions was very low. Desorption studies were also carried out using deionized water and dilute HCl. The latter proved to be more efficient in releasing the metal ions from the metal peat complex so that the peat can thus be used again.
38 citations
TL;DR: During feeding, the larva sits longitudinally on the leaf, bends the head sideways, and scrapes out the soft tissue between bundles longitudinal up and down, leaving only the bundle unit + bundle sheath, sclerenchyma, and the abaxial epidermis + cuticle between the bundles intact, when feeding on the upper side.
Abstract: During feeding, the larva sits longitudinally on the leaf, bends the head sideways, and scrapes out the soft tissue between bundles longitudinally up and down, leaving only the bundle unit + bundle sheath, sclerenchyma, and the abaxial epidermis + cuticle between the bundles intact, when feeding on the upper side. Feeding on the underside also includes most of the bulliform cells, sparing again the bundle unit plus the remaining adaxial epidermis cells + cuticle between the bundles. Feeding is essentially restricted to green mesophyll tissue and may occur practically over the whole leaf surface. Of the eaten portion of a leaf, about two-thirds is consumed (by dry weight). Regular longitudinal feeding was observed in many other species of Gramineae, and in several Cyperaceae. In a few cases of thick or tough leaves feeding ocurred also in irregular non-linear fashion. Extensive irregular feeding was also observed in one specimen of a soy plant. Young larvae up to the early second instar are gregarious, but subsequently become solitary, with only one larva per leaf roll.
ZUSAMMENFASSUNG
DAS FRASSVERHALTEN DES REISBLATTROLLERS, CNAPHALOCROCIS MEDINALIS (LEPIDOPTERA, PYRALIDAE, PYRAUSTINAE)
Wahrend die Raupen fressen, sitzen ***sie in Langsrichtung auf dem Blatt, neigen den Kopf seitlich und scharren das weiche Gewebe zwischen den Leitbundeln aus. Unberuhrt bleibt beim Fressen von der Oberseite her nur das Leitbundel mit der Bundelscheide, das Sklerenchym, die abaxiale Epidermis mit der Kutikula. Beim Fressen auf den Unterseite wird auch der grosste Teil der ***Bulhformzellen erfasst. Dabei wird das Gefassbundel mit der nun adaxialen Epidermiszellen und der Kutikula zwischen den Bundeln ausgeschlossen. Das Fressen ist hauptsachlich auf das grune Mesophyllgewebe beschrankt und kann praktisch uber die ganze Blattoberflache stattfinden. Ungefahr zwei Drittel des Trockengewichtes eines befressenen Blattabschnittes wird verzehrt. Regelmassiges Fressen in Langsrichtung wurde auch an vielen andern Gramineen- und Cyperaceenarten beobachtet. An einigen dicken und harten Blattern, z.B. Bambus, wurde manchmal in einer ganz unregelmassigen Weise gefressen. Solch unregelmassiges Fressen wurde auch einmal auf einer Soyapflanze beobachtet. Junge Raupen, sind bis zum fruhen zweiten Stadium gregar, werden aber spater solitar mit einer einzigen Raupe in einer Blattrolle.
36 citations
TL;DR: Two populations of Asiatic elephants Elephas maximus of two different home-ranges of Sri Lanka's Gal Oya area were compared, and the group-size-frequency distributions of matriarchal groups belonging to the two populations were significantly different.
17 citations
TL;DR: The extractives of Calophyllum tomentosum contain friedelin, friedelan-3β-ol, betulinic acid, taraxero, and betulinicity as mentioned in this paper.
16 citations
TL;DR: Calozeylanic acid has been isolated from the bark of three calophyllum species: C.lankaensis, C.thwaitesii and C.walkeri.
13 citations
TL;DR: In this article, a reinvestigation of the photolysis of [Ru(bipy)3]-NCSe)2 in ethanol under dinitrogen has failed to give the previously reported [RuN3]2bipsy2] but, under appropriate conditions, may yield the complex [RuNCO)2bopy2].
9 citations
TL;DR: In this paper, the authors analyzed the thermal trap effect in semitransparent material and the trapping system in the conventional flat-plate collectors with two, three or four glass or plastic covers with air-gaps in between, under the common heading of thermal trap collectors.
TL;DR: A methanolic extract of the leaves of Triphasia trifoliata contained isomeranzin, umbelliferone and coumarin (triphasiol) as mentioned in this paper.
TL;DR: Six selections of winged bean, namely LBNC3, LBNC1,3 TPT2, UPS122, SLS1 and SLS6, were grown under plant-house conditions to study their nodulation patterns during the establishment stages of growth and there was a very high positive correlation between nodule mass and shoot mass.
Journal Article•
TL;DR: In this paper, it has been observed that the PT conditions characteristic of granulite facies had favored the formation of gem minerals such as topaz, corundum, beryl, spinel, tourmaline and zircon.
Abstract: Field and laboratory studies on the geology and mineralogy of gem sediments and associated rocks reveal that gem minerals occur both in garnetiferous gneisses and granulites It has been observed that PT conditions characteristic of granulite facies had favoured the formation of gem minerals such as topaz, corundum, beryl, spinel, tourmaline and zircon
TL;DR: In this article, evidence for probable Paleozoic glaciation is reported for the first time from Sri Lanka, where rhymic sequences containing clay/peat, sand, gravel and pebble layers occur in valleys underlain by Precambrian metamorphic rocks.
TL;DR: Involvement of the salivary glands in the inflammatory tissue in some cases produced interlobular and interacinar fibrosis resembling 'fibro-adenosis', Similar lesions were reproduced with a strain of Klebsiella aerogenes isolated from a diseased rat.
Abstract: Summary Klebsiella aerogenes was identified as the pathogen in an epizootic of single and multiple abscesses in the cervical, axillary and inguinal regions in laboratory rats. Involvement of the salivary glands in the inflammatory tissue in some cases produced interlobular and interacinar fibrosis resembling 'fibroaden os is', Similar lesions were reproduced with a strain of Klebsiella aerogenes isolated from a diseased rat. Oral carriage of the same strain was detected in the diseased rats, and in normal rats of the same stock. Lymphadenitis appears to have been the primary lesion. Reports of infections in laboratory rodents caused by Klebsiella spp. are scanty. This paper describes an epizootic of cervical, axillary and abdominal abscesses caused by K. aerogenes in a colong of laboratory rats. An added feature of interest in some of the cervical and axillary abscesses was the extension of the infection followed by fibrosis of the adjacent salivary glands which resulted in appearances in the latter which were suggestive of 'fibroadenosis' of the glandular tissue. As far as we are aware, no such K. aero'genes infections in rats have previously been reported. A note on the use of Czapek-Dox agar for the selective isolation of K. aerogenes from pus is included.
TL;DR: An analysis was made of the tasks the interne medical officers in Sri Lanka are engaged in during their period of training in different clinical disciplines, showing an urgent need to implement a planned and monitored interneship programme in the country.
Abstract: Summary
The interneship period is a critical phase in the continuum of training provided to medical students. An analysis was made of the tasks the interne medical officers in Sri Lanka are engaged in during their period of training in different clinical disciplines. Data was collected by direct observations by trained observers for a continuous period of 10 days and self-reporting by the internes at the two teaching hospitals and four of the provincial hospitals where internes are posted. The reliability of the data was high. The results indicated the wide differences in the learning experiences of the internes in important aspects of patient care in the different training situations. The non-availability of any guidelines to the consultants with respect to the training intended is another deficiency. The study shows an urgent need to implement a planned and monitored interneship programme in the country.
TL;DR: In this article, the authors explored the implications of a subsystem that is linked to the remainder of the vibrating system at a single generalized co-ordinate, and showed that a tuned absorber is a small resonant subsystem that may not be small.
TL;DR: In this article, the authors discuss criteria for obtaining such reliability indices or modifying existing reliability indices for use in less developed power systems and propose relevant criteria for planning, bulk supply reliability assessment and costing of alternatives.
Abstract: Conventional reliability criteria are severely restricted in usefulness for small or less developed systems which are at an early stage of their evolution. Such systems may suffer from partial or chronic generation shortage for certain periods of their growth. The transmission system may also be unevenly interconnected. Some key bus-bars may be well connected while others may have poor alternative infeeds. Nevertheless the system planner needs quantitative reliability indices to guide him. This paper discusses criteria for obtaining such indices or modifying existing indices for use in less developed power systems. Relevant criteria for planning, bulk supply reliability assessment and costing of alternatives are proposed.
DOI•
01 Sep 1981TL;DR: In this article, the Savonius-type, slow-running, vertical-axis wind-rotors as well as rotor designs of different subclasses under comparable design and test conditions were investigated.
Abstract: This paper summarises the results of investigations on the Savonius-type, slow-running, vertical-axis wind-rotors as well as on rotor designs of different subclasses under comparable design and test conditions. It is seen that the performance of the conventional Savonius rotor could be considerably improved upon and the best results are achieved by using two-bladed rotors with a more sophisticated sectional profile than in the conventional design. Rotors with several blades, although capable of considerably higher performance than the Savonius rotor, do not appear to be as good as those with two blades and improved sectional geometry.
TL;DR: In this article, Kokzeylanol and kokzeylanonol obtained from Kokoona zeylanica have been shown to be 6β,27-dihydroxy-D:A-friedo-olean-3-one (1) and 6β-27-Dihydroxene-D :A- friedo-oleana-3,21-dione (2) respectively by the deoxygenatlon of their 27-acetoxy derivatives using Lithium-ethylene diamine reduction coupled with spectroscopic and irrad