Determination of duodenogastric reflux by quantification of bile acids in the gastric juice

The existence of duodeno-gastric reflux was evaluated in a group of 15 healthy subjects, in fasting and for 24 hours. The assessment of duodeno-gastric reflux was made by quantitation of the bile acids (BA) present in the gastric juice. The individual free and conjugated BA were separated and quantified by means of thin-layer chromatography and in situ spectrofluorometry. In 7 of the subjects studied no BA were detected, and in the other 8 subjects the BA levels were below 6 mumol reflux/hour. There were no free BA detected in any of the subjects. The levels of BA in gastric juice increased progressively with age, but there were no differences between sex. The chromatographic technique used is highly sensitive for the analysis of BA in biological samples. The study of BA in the gastric juice provides a quantitative and reliable assessment of the degree of duodeno-gastric reflux.     

Co-segregation of a gene encoding a deletion ligand for Tcrb-V3+ T cells with Mtv-3

A gene encoding the endogenous superantigen Mls^c, which deletes Tcrb-V3⁺ T cells in the NOD inbred mouse strain, was found to co-segregate with Mtv-3 on chromosome 11. This identifies a fourth gene encoding a deletion ligand for Tcrb-V3⁺ T cells and extends recently published observations in support of the hypothesis that a number of endogenous superantigens are the products of Mtv proviruses. Address correspondence and offprint requests to : K. Tomonari.     

Ecology of microalgae in a high rate pond for piggery effluent purification in Singapore

Summary An integrated system for the collection, treatment and utilisation of piggery wastewater has been developed in Singapore which uses the cultivation of microalgae in high rate ponds to achieve reduction of BOD₅ and COD₅ of the effluent as well as producing single cell protein. A wide range of algal flora occurs in the ponds;Oocystis, Micratinium, Scenedesmus, Ankistrodesmus, Chlorella andOscillatoria spp were identified. Total algal counts, recorded from 1979 to 1981, ranged up to 10⁷ per ml of pond water. There were considerable variations in the algal population and in the predominating species. No discernible pattern was evident. Consequently pond operations were frequently disturbed by these fluctuations in population which in turn was attributed to the heterogeneous composition of the piggery waste, to variable weather conditions and to predation by larger organisms particularlyMoina. After passing through the ponds, the total suspended solids were removed by a novel dissolved air flotation method which gave a clear effluent showing an 87% reduction in BOD₅ value.

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Resumen En Singapur se ha desrrollado un sistema integrado para le recogida, tratamiento y utilización de aguas residuales de pocilgas. Este sistema usa el cultivo de microalgas en estanques, de caudal rápido afin de reducir las DBO₅ y DCO₅ del efluencte produciendo asimismo proteínas celulares. La flora de algas producida en estos estanques es amplia y variada, habiendose identificado:Oocystis, Micratinium, Scenesdemus, Ankistrodesmus, Chlorella y Oscillatoria. Los recuentos totales de algas tomados desde 1979 a 1981 llegaron a alcanzar 10;⁷ por ml de agua del estanque. Se observaron variaciones considerables tanto en la población total de algas como en las especies predominantes sin que se pudiese, determinar un patrón de variación característico. Estas fluctuaciones en la población, causantes de frecuentes alteraciones en el funcionamiento del estanque, se atribuyeron a la composición heterogenea de los resuduos, a las variaciones climáticas y la predación por otros organismos particularmenteMoina Después de su paso por los estanque los solidos suspendidos totales se eliminaron mediante un nuevo método de flotación con aire disuelto, obteniendose un efluente limpio con una reducción de la DBO₅ del 87%.

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Résumé Un système intégré pour la collecte, le traitement et l'utilisation d'eaux résiduaires de porcherie a été développé à Singapoure. Il utilise la culture de micro-algues tant pour la réduction accélérée en lagune de la DBO₅ et de la DCO de l'effluent que pour la production de protéines uni-cellulaires. On trouve une large gamme de flore algale dans les lagunes; des espèces d'-Oocystis, deMicratinium, deScenedesmus, Ankistrodesmus, deChlorella etd'Oscillatoria out été identifiées. Les comptages totaux d'algues, enregistrées de 1979 à 1981, ont donné jusqu' à 10⁷ cellules par ml d'eau de la lagune. On a observé des variations considérables de population algale tant quantitatives que qualitatives. On ne discernait pas de spectres évidents. En conséquence, les opérations lagunaires ont été fréquemment perturbées par ces fermentations en population, qui, à leur tour, ont été attribuées à la composition hétérogène de l'effluent de porcherie, aux conditions atmosphériques et climatiques variables et à la prédation par des organismes plus conséquents, plus particulièrement desMoina. Après passage par les lagunes, les solides totaux en suspension ont été enlevés par une méthode nouvelle de flottation à l'air dissous, qui a donné un effluent limpide, présentant une réduction de DBO₅ de 87%.

     

Gastrointestinal absorption of estrone sulfate in germfree and conventional rats

Steroids are extensively excreted in the bile of rats. There was no significant difference in biliary excretion of steroid following administration of [3H]-estrone sulfate into the proximal small intestine (PSI) of conventional (CVL; 17.8 +/- 62%; mean +/- SD) or germfree (GF; 28.2 +/- 5.3) rats. A similar finding resulted from administration into the distal small intestine (DSI)-CVL, 22.3 +/- 11.8%; GF, 11.4 +/- 3.7%. However, when the drug was given into the caecum, excretion in the bile of CVL rats after 5 h was 59.1% whereas in GF rats it was only 1.7%. When estrone was injected into the PSI and DSI of CVL and GF rats, absorption (as judged by excretion in bile) was more rapid than that seen with estrone sulfate. Five hours after injection into the PSI, biliary excretion was, in CVL 88.2% and in GF 81.7% and after injection into the DSI excretion was, in CVL 84.7% and in GF 83.6%. Absorption of estrone from the caeca of GF rats was apparently reduced (49.0% and 25.3% excreted in the bile of CVL and GF rats respectively). There was no significant difference in bile flow rate between CVL and GF rats. These results give unequivocal evidence of intact absorption of estrone sulfate from the small intestine of the rat. The rate of absorption is however very much reduced compared to the non-sulphated steroid. Estrone sulfate is not absorbed intact in the caecum but is hydrolysed by the gut microflora prior to absorption.     

Immunoglobulin levels in various clinical groups of human Brugian filariasis in Malaysia

Quantitation of serum immunoglobulin M, G, A, D and E levels was carried out in Malaysians with Brugia malayi infections. Results showed highly elevated levels of IgM and IgE as well as moderately elevated levels of IgG. These were most significant in patients with tropical pulmonary eosinophilia or elephantiasis. Serum IgE levels were extremely high in microfilaraemic patients (6,060 +/- 3,958 IU ml) probably due to a constant antigenic stimulation by dead and dying microfilariae.     

Uraniosomes produced in cultured rabbit kidney cells by uranyl acetate

Cultured rabbit kidney cells were exposed to uranyl acetate. This produced single-membrane-bound presumably lysosomal bodies (called 'uraniosomes') containing electron-dense crystals in the cultured cells. Similar crystalline deposits were seen in extracellular locations also. All uraniosomes and extracellular uranium deposits analyzed by electron-probe x-ray analysis were found to contain uranium, potassium, calcium and phosphorus. Traces of sulphur were detected in some but not all uraniosomes and extracellular uranium deposits.     

Cortical cell fluxes and transport to the stele in excised root segments of Allium cepa L.

From compartmental analysis of radioisotope elutin measurements, fluxes of Ca²⁺ were estimated for cortical cells in root segments of onion, Allium cepa L., relative to complete nutrient solutions containing a range of calcium concentrations ([Ca₀]) from 2 eq l^-1 to 20 meq l^-1, increasing in 10-fold steps for Ca²⁺. Except for the calcium counter-ion (usually NO ₃ ^- , sometimes Cl^- at the highest [Ca₀]), the composition of the nutrient solution was other-wise the same at all calcium concentrations. Compartmental analysis indicated that the cytoplasm had a high content of exchangeable Ca²⁺ but, in the light of evidence from animal studies, ionic activity of calcium in the cytoplasm was assumed to be no greater than 0.002 eq ml^-1. With the Ussing-Teorell flux equation as the criterion, it was concluded that at all values of [Ca₀] tested, Ca²⁺ entered the cytoplasm passively and was actively pumped back into the external solution. Entry of calcium to the vacuole from the cytoplasm was active in all cases. The conclusions regarding the character of ion transport across the plasmalemma were the same as when the whole calcium content of the cytoplasm was taken to contribute to the ionic activity. However, the electrochemical activity gradient was very much steeper than formerly estimated. Calcium was transported to the stele in proportion to the calcium content of the cytoplasm and moved in the xylem almost exclusively in the basipetal direction.     

Induced recovery of a suppressed idiotype by immunization with anti-idiotype

Neonatal Balb/c mice were suppressed forthe H8/T15 idiotype by injection of homologous anti-H8 (D. S. Strayer, D. A. Rowley, and H. Köhler, et al J. Immunol.114, 722, 1975. Six to eight weeks later groups of these suppressed mice were immunized up to three times with isologous anti-H8 raised in Balb/c. After a rest of 4 weeks each group was challenged with R36a vaccine and bleedings were obtained before and after this challenge. All sera were assayed for total anti-PC and H8 idiotype amounts by solid-phase radioimmunoassay. After two-preimmunizations with isologous anti-H8 no increase of the H8 levels was observed though these mice responded to R36a immunization with an increase of total anti-PC antibodies. After the third preimmunization, however, the H8 idiotype was increased in sera taken before and after challenge with R36a. These findings demonstrate that the state of neonatal idiotype suppression can be broken by immunization with complementary anti-idiotype.