Browse publications by year: 1990

  1. Tan NH, Ponnudurai G
    PMID: 1971550
    1. The intravenous median lethal doses (LD50), protease, phosphodiesterase, alkaline phosphomonoesterase, L-amino acid oxidase, acetylcholinesterase, phospholipase A, 5'-nucleotidase, hyauronidase and anticoagulant activities of fourteen samples of venoms from the four common species of krait (Bungarus caeruleus, Bungarus candidus, Bungarus multicinctus and Bungarus fasciatus) were examined. 2. The results indicate that even though there are individual variations in the biological properties of the krait venoms, interspecific differences in the properties can be used for differentiation of the venoms from the four species of Bungarus. Particularly useful for this purpose are the LD50's and the contents of 5'-nucleotidase and hyaluronidase of the venoms.
    MeSH terms: Acetylcholinesterase/metabolism; Alkaline Phosphatase/metabolism; Amino Acid Oxidoreductases/metabolism; Animals; Anticoagulants; Carboxylic Ester Hydrolases/metabolism; Coagulants; Elapid Venoms/pharmacology*; Hemorrhage/chemically induced; Hyaluronoglucosaminidase/metabolism; Lethal Dose 50; Peptide Hydrolases/metabolism; Phosphoric Diester Hydrolases/metabolism; Phospholipases A/metabolism; Species Specificity; 5'-Nucleotidase/metabolism; L-Amino Acid Oxidase; Mice
  2. Sharma JN, Mohsin SS
    Exp Pathol, 1990;38(2):73-96.
    PMID: 1971600
    In recent years, numerous agents have been recognized as inflammatory mediators. In this review, however, we discuss only those having direct relevance to human inflammatory diseases These mediators are clinically important due to their proinflammatory properties such as vasodilatation, increased vascular permeability, pain and chemotaxis. They may lead to the fifth cardinal sign, loss of function in inflammatory diseases. Agonists and non-specific antagonists are used as pharmacological tools to investigate the inflammatory role of PGs, LTs, PAF, IL-1, histamine, complement, SP, PMN-leukocytes, and kallikrein-kininogen-kinin systems. Unfortunately, no compound is known which concurrently abolishes all actions and interactions of inflammatory mediators. Therefore it would be highly useful to promote efforts in developing selective and competitive antagonists against proinflammatory actions of these chemical mediators. This may help to a better understanding of the pathogenesis of inflammatory reactions, and it may also be useful for the therapy of inflammatory diseases.
    MeSH terms: Anaphylatoxins/physiology; Animals; Complement System Proteins/physiology; Humans; Inflammation/etiology*; Interleukin-1/physiology; Kallikreins/physiology; Kinins/physiology*; Neutrophils/physiology; Platelet Activating Factor/physiology; Autacoids/physiology*
  3. de Barjac H, Sebald M, Charles JF, Cheong WH, Lee HL
    C. R. Acad. Sci. III, Sci. Vie, 1990;310(9):383-7.
    PMID: 1972899
    A strain of Clostridium bifermentans individualized as serovar malaysia (C.b.m.) according to its specific H antigen is toxic to mosquito and blackfly larvae when given orally. The toxicity occurs in sporulated cells which contain, in addition to spores, proteinic parasporal inclusion bodies and feather-like appendages; the amino acid content of the inclusion bodies is similar to that of Bacillus thuringiensis serovar israelensis (B.t.i.) and B. sphaericus crystals. The toxicity to Anopheles stephensi is as high as that of B.t.i. and the best strains of B. sphaericus. Culex pipiens is somewhat less susceptible, and Aedes aegypti much less. Pure parasporal inclusion bodies, isolated by ultracentrifugation on sucrose gradients, are highly toxic to mosquito larvae. The larvicidal power is destroyed by heating at 80 degrees C or by treatment with 50 mM NaOH. It is preserved by freeze-drying. The innocuity to mice of the sporulated cells is shown by different routes of administration: force-feeding, percutaneous, subcutaneous, intraperitoneal or intravenous injections. The potential for the biological control of mosquito and blackfly larvae is suggested.
    MeSH terms: Animals; Centrifugation, Density Gradient; Clostridium/classification; Clostridium/isolation & purification; Clostridium/pathogenicity*; Larva/microbiology; Culicidae/microbiology*; Simuliidae/microbiology*; Temperature; Mice
  4. Saha N, Tay JS, Carritt B
    Hum. Hered., 1990;40(4):250-2.
    PMID: 1974242
    Three different ethnic groups from Singapore comprising 79 Chinese, 34 Malays and 23 Indians of Dravidian origin, were investigated for the HindIII RFLP at the DNF15S2 locus. The three populations had very similar allele frequencies and the frequency of rarer(S) allele was significantly (p less than 0.01) lower (0.21) in these ethnic groups compared to that in Caucasians (0.41). The phenotypic distributions were at Hardy-Weinberg equilibrium.
    MeSH terms: China/ethnology; Chromosomes, Human, Pair 3; Ethnic Groups*; Gene Frequency; Humans; India/ethnology; Malaysia/ethnology; Phenotype; Polymorphism, Restriction Fragment Length*; Singapore; Deoxyribonuclease HindIII/genetics*
  5. Tan NH, Ponnudurai G
    PMID: 1981349
    1. The hemorrhagic, procoagulant, anticoagulant, protease, phosphodiesterase, alkaline phosphomonoesterase, L-amino acid oxidase, acetylcholinesterase, arginine ester hydrolase, phospholipase A, 5'-nucleotidase and hyaluronidase activities of 39 samples of venoms from 13 species (15 taxa) of Australian elapids were determined and the Sephadex G-75 gel filtration patterns for some of the venoms were also examined. 2. The results indicate that Australian elapid venoms can be divided into two groups: procoagulant Australian venoms (including N. scutatus, N. ater, O. scutellatus, O. microlepidotus, P. porphyriacus, T. carinatus, H. stephensii and P. textilis) and non-procoagulant Australian venoms (including A. superbus, P. colletti, P. australis, P. guttatus and A. antarcticus). 3. The non-procoagulant Australian venoms exhibited biological properties similar to other elapid venoms, while the procoagulant Australian venoms exhibited some properties characteristic of viperid venoms. 4. The data show that information on venom biological properties can be used for differentiation of many species of Australian elapids. 5. Particularly useful for this purpose are the hyaluronidase, alkaline phosphomonoesterase, acetylcholinesterase, and the procoagulant activities and the Sephadex G-75 gel filtration patterns of the venoms.
    MeSH terms: Animals; Australia; Chromatography, Gel; Elapid Venoms/isolation & purification; Elapid Venoms/metabolism; Elapid Venoms/pharmacology; Elapid Venoms/toxicity*; Hydrolases/isolation & purification; Hydrolases/metabolism; Snakes; Species Specificity
  6. Ridzwan BH, Waton NG, Rozali BO, Jais AM, Maimun AH
    PMID: 1982866
    1. In vitro studies of non-specific histidine decarboxylase activity was low or absent in control guinea-pigs and unchanged 9 or 27 hr after chlorpromazine (CPZ) injection intraperitoneally. 2. However, specific histidine decarboxylase activity was found in the control tissues and was increased 9 hr but not 27 hr after CPZ injection.
    MeSH terms: Animals; Chlorpromazine/pharmacology*; Female; Guinea Pigs; Histamine/metabolism; Histidine Decarboxylase/metabolism*; Ileum/drug effects; Ileum/enzymology; Kidney/drug effects; Kidney/enzymology; Liver/drug effects; Liver/enzymology; Male; Stomach/drug effects; Stomach/enzymology
  7. Ridzwan BH, Waton NG
    PMID: 1982867
    1. Oral administration of [14C]histamine induced the presence of small amounts of [14C]histamine in stomach and ileal tissues of control guinea-pigs. In contrast, much larger amounts were found after 8 h infusion. 2. Similar amounts of [14C]histamine were found in the tissues when [14C]histamine was given by intravenous infusion from 24-30 h after chlorpromazine injection.
    MeSH terms: Administration, Oral; Animals; Carbon Radioisotopes*; Chlorpromazine/pharmacology*; Fasting; Female; Gastric Mucosa/metabolism; Guinea Pigs; Histamine/administration & dosage; Histamine/blood; Histamine/pharmacology*; Ileum/drug effects; Ileum/metabolism; Infusions, Intravenous; Injections, Intramuscular; Lung/drug effects; Lung/metabolism; Male; Stomach/drug effects
  8. Tan NH, Saifuddin MN
    PMID: 1982873
    1. The edema-inducing activity of 24 venoms from snakes of the subfamilies of Elapinae, Hydrophiini, Crotalinae and Viperinae was determined. 2. All snake venoms tested are very potent edema inducers. The minimum edema doses of the venoms ranged from 0.16 to 3.41 micrograms per mouse paw. 3. The venoms induced a rapid onset edema which peaked within 1 h of injection and declined thereafter; at low dose, however, some venoms induced a rapid onset edema that sustained over a longer duration.
    MeSH terms: Animals; Crotalid Venoms/administration & dosage; Crotalid Venoms/toxicity; Dose-Response Relationship, Drug; Edema/chemically induced*; Elapid Venoms/administration & dosage; Elapid Venoms/toxicity; Kinetics; Snake Venoms/administration & dosage; Snake Venoms/toxicity*; Viper Venoms/administration & dosage; Viper Venoms/toxicity; Mice
  9. Chee CP, Tan CT, Nuruddin R
    Br J Neurosurg, 1990;4(6):529-33.
    PMID: 2076215
    An unusual case of syringomyelia secondary to a cauda equina meningioma involving the conus medullaris is described. The tumour was totally removed with decompression of an adjacent cyst and syrinx resulting in resolution of the symptoms and radiological appearance.
    MeSH terms: Adult; Cauda Equina*; Cysts/etiology; Cysts/surgery; Female; Humans; Meningioma/complications*; Meningioma/surgery; Peripheral Nervous System Neoplasms/complications*; Peripheral Nervous System Neoplasms/surgery; Spinal Cord Diseases/etiology; Spinal Cord Diseases/surgery; Spinal Cord Neoplasms/surgery; Syringomyelia/etiology*; Tomography, X-Ray Computed
  10. Boon LC, Nik-Hussein NN
    J Pedod, 1990;14(3):136-8.
    PMID: 2081129
    Various alloplastic and autogenous tissues have been used in attempts to restore facial height and reconstruct temporomandibular articulation. A case is presented where an ectodermal rib graft was used to reconstruct the temporomandibular joint after arthroplasty in a young child.
    MeSH terms: Ankylosis/surgery*; Arthroplasty*; Cartilage/transplantation; Child, Preschool; Facial Asymmetry/etiology; Female; Humans; Maxillofacial Development; Temporomandibular Joint Disorders/surgery*; Trismus
  11. Jaafar N, Abdul Razak I
    J Pedod, 1990;14(3):147-9.
    PMID: 2081132
    Diet and sugar eating habits, in particular sweet preference levels, are gradually nurtured over time by culturally accepted dietary norms. The dietary habits of Malaysia's three main ethnic groups are distinctively different from each other and expectedly, many studies have discovered significant ethnic variations in caries experience. In order to guide further research work into the causes of these variations, this pilot study was designed to establish whether ethnic variations exist in sweet preference levels. This study found that although the difference in sweet preference between boys and girls in this sample was not statistically significant, the ethnic variation was statistically significant. The implications of this study and suggestions for further research in this field are discussed.
    MeSH terms: Child; Dental Caries/epidemiology; Diet, Cariogenic*; Dietary Carbohydrates/analysis; Ethnic Groups*; Female; Food Preferences*; Humans; Malaysia/epidemiology; Male; Pilot Projects; Sucrose/analysis
  12. Abdul Razak IA, Esa R, Jalallundin RL, Jaafar N
    J Pedod, 1990;14(4):242-5.
    PMID: 2098079
    The aim of this postal survey was to assess the utilization, knowledge and attitude concerning sealants among Malaysian dentists. A pretested questionnaire was sent to all dentists (1217) who were on the Dentist Register of Malaysia of 1987. A response rate of 61.1% was obtained. The results indicate that 52.6% of the respondents have used sealants, but of these only 13.6% have used them frequently. The two "knowledge" related questions receiving the most support concerned the suitability of the first permanent molars for sealants and the loss of sealants attributable to problems at the time of application. The two "attitudinal" questions receiving the most support concerned the value of sealants in preventing dental caries and the need for the profession to expand more efforts toward increasing public demand for sealants. Only about 50% of the respondents believed that sealants are cost-effective.
    MeSH terms: Attitude of Health Personnel*; Dentists; Health Knowledge, Attitudes, Practice; Malaysia; Pit and Fissure Sealants*; Surveys and Questionnaires
  13. Fucharoen S, Fucharoen G, Ata K, Aziz S, Hashim S, Hassan K, et al.
    Acta Haematol., 1990;84(2):82-8.
    PMID: 2120891 DOI: 10.1159/000205034
    The spectrum of beta-thalassemia mutations in Malaysia has been determined in 45 beta-thalassemia chromosomes using dot blot hybridization of the polymerase chain reaction amplified DNA and direct DNA sequencing. Eleven different molecular defects, including those previously detected in Chinese, Asian Indians, and American blacks, and a novel frameshift mutation causing beta zero-thalassemia were detected. Since this novel mutation, a T deletion in codon 15 creates a new restriction site for EcoRII enzyme; the mutation could be detected by EcoRII digestion of the appropriate amplified fragment. The results of the present study provide additional information on the molecular heterogeneity of beta-thalassemia in this population. We also demonstrated the nonradioactive detection method of the beta-thalassemia mutation based upon the digoxigenin-labeled oligonucleotide probes.
    MeSH terms: Base Sequence; Digoxigenin; DNA Mutational Analysis; Genetic Testing; Humans; Malaysia; Molecular Sequence Data; Pedigree; Polymorphism, Genetic; Thalassemia/ethnology; Thalassemia/genetics*; DNA Probes; Polymerase Chain Reaction
  14. Foo LC
    Trop Geogr Med, 1990 Jan;42(1):8-12.
    PMID: 2124397
    Anthropometric and parasitological data from cross-sectional studies of two groups of primary school children (Group I of Indian origin, 325 boys and 259 girls, age = 7 years; Group II of Malay origin, 284 boys and 335 girls, age = 7-9 years) from two different ecological settings in Peninsular Malaysia were examined for epidemiological evidence of an association between hookworm infection and protein-energy malnutrition. In both ecological groups, significant weight, height and haemoglobin deficits were observed in children with hookworm infection after adjustment for covariables including Ascaris and Trichuris infection intensities and other child and family characteristics. The deficits were related to the intensity of infection based on egg counts. These findings suggest that hookworm may be an important determinant of chronic protein-energy malnutrition, as well as anaemia, in areas where diets are generally inadequate in protein, energy, and iron. Well-controlled intervention studies are needed to confirm these observations.
    MeSH terms: Anthropometry; Ascariasis/complications; Ascariasis/epidemiology; Child; Chronic Disease; Cross-Sectional Studies; Feces/parasitology; Female; Hookworm Infections/complications*; Hookworm Infections/epidemiology; Hookworm Infections/parasitology; Humans; India/ethnology; Malaysia/epidemiology; Male; Parasite Egg Count; Protein-Energy Malnutrition/etiology*; Protein-Energy Malnutrition/epidemiology; Protein-Energy Malnutrition/parasitology; Regression Analysis; Trichuriasis/complications; Trichuriasis/epidemiology; Child Nutrition Disorders/etiology*; Child Nutrition Disorders/epidemiology; Child Nutrition Disorders/parasitology
  15. Lee YH, Hussain ZA, Choong FP
    PMID: 2125616
    The in-vitro activity of cefotaxime and cefoperazone were compared using clinically isolated Escherichia coli, Klebsiella spp and Pseudomonas aeruginosa. Cefotaxime was found on a weight to weight basis, to be much more active than cefoperazone. All the three species studied show the presence of cefoperazone-resistant population which were sensitive to cefotaxime. The possible mechanisms of resistance to these antibiotics were discussed.
    MeSH terms: Cefoperazone/pharmacology*; Cefotaxime/pharmacology*; Drug Resistance, Microbial; Escherichia coli/drug effects*; Klebsiella/drug effects*; Microbial Sensitivity Tests; Pseudomonas aeruginosa/drug effects*
  16. Tan NH, Saifuddin MN, Jaafar MI
    Toxicon, 1990;28(11):1355-9.
    PMID: 2128424
    Hannahtoxin, the major hemorrhagin purified from king cobra (Ophiophagus hannah) venom, elicits hemorrhages in rabbits but not in mice. Two antisera against hannahtoxin were prepared: one raised against purified hannahtoxin, while the other was raised against glutaraldehyde cross-linked and detoxified hannahtoxin. The antisera were refined by pepsin digestion and ammonium sulfate precipitation. They are of approximately equal potency in their ability to neutralize the hemorrhagic activity of king cobra venom in rabbits. The antisera did not form a precipitin line with venom of snakes of the Viperidae family nor neutralize hemorrhages elicited in mice by any of these venoms. However, when the hemorrhagic activity was assayed in rabbits, both antisera were able to abolish the hemorrhages elicited by all of the venoms tested. These results suggest that hannahtoxin displays few epitopes in common with hemorrhagins of viperid venoms, except those involved in the neutralization of hemorrhagic activity in rabbits. The epitopes of viperid venom hemorrhagins involved in the neutralization reaction in rabbits are different from those in mice.
    MeSH terms: Animals; Antivenins/immunology*; Cross Reactions; Immunodiffusion; Immune Sera/immunology; Endopeptidases/immunology*; Endopeptidases/toxicity; Rabbits; Mice
  17. Wong YL
    Asia Pac J Public Health, 1990;4(4):258-64.
    PMID: 2130857
    MeSH terms: Child*; Child Abuse/prevention & control; Child Advocacy*; Female; Humans; Malaysia/epidemiology; Male; Parent-Child Relations; Social Justice*; Socioeconomic Factors; Women's Rights*; Incidence
  18. Chen ST
    J Singapore Paediatr Soc, 1990;32(3-4):102-7.
    PMID: 2133745
    Over the past hundred years in industrialised countries and recently in some developing countries, children have been getting larger and growing to maturity more rapidly. This paper compares the growth of Malaysian children with similar socioeconomic backgrounds but born about twelve years apart. Data were obtained from records of 227 children born between 1968 and 1973 and 238 children born between 1980 and 1985. The children were followed-up regularly at the University Hospital Child Health Clinic in Kuala Lumpur for a variable period from birth to five years of age. Measurements for their weight, length and head circumference were taken at each visit. There is a directional indication that boys and girls of the 1980-1985 cohort are taller, heavier and have bigger head circumferences from birth to five years of age and the difference widens as the child grows older. This study clearly shows that a positive secular trend has taken place in the last decade, reflecting an improvement of living conditions with time. The factors involved in the positive secular trend are manifold and the most important is probably nutrition.
    MeSH terms: Age Factors; Ambulatory Care Facilities; Body Height; Body Weight; Cephalometry; Child; Child, Preschool; Female; Growth*; Hospitals, University; Humans; Infant; Infant, Newborn; Malaysia; Male; Sex Factors; Socioeconomic Factors; Time Factors; Cohort Studies
  19. Chen ST
    J Singapore Paediatr Soc, 1990;32(3-4):65-80.
    PMID: 2133760
    126 Malaysian children, 65 boys and 61 girls from higher income families were followed-up regularly from birth to six years of age in the University Hospital, Kuala Lumpur. Their physical growth, development, dietary and illness patterns were measured at each visit. The study confirms the observations of previous studies that boys are, on the average, heavier and taller than girls and that Asians are smaller in size with relatively shorter legs compared with children of European ancestry. These racial differences are due to a combination of genetic and environmental differences. Since there are genetic differences in the size and shape of children, standards applicable to the specific population should be used to obtain the best results when assessing the health of an individual child. The growth charts presented in this paper can be used as standards to monitor the growth of Asian infants and pre-school children.
    MeSH terms: Age Factors; Biometry; Body Height*; Body Weight*; Child; Child, Preschool; Female; Growth*; Humans; Infant; Infant, Newborn; Malaysia; Male; Reference Values; Sex Factors; Continental Population Groups
  20. Chen ST
    J Singapore Paediatr Soc, 1990;32(3-4):81-6.
    PMID: 2133761
    126 Malaysian children, 65 boys and 61 girls from higher income families were followed-up regularly from birth to six years of age in the University Hospital, Kuala Lumpur. The study confirms the observations of previous studies that growth velocity of head circumference is most rapid during the first few months of infancy and then decreases so that by the fifth year of life the increment is minimal. It also confirms the fact that boys have bigger head circumferences than girls. The paper also presents the head circumference distance and velocity percentile charts which can be used to monitor the head circumference of Malaysian children.
    MeSH terms: Age Factors; Cephalometry*; Child; Child, Preschool; Female; Head/growth & development*; Humans; Infant; Infant, Newborn; Malaysia; Male; Reference Values; Sex Factors
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