Study of Physicochemical of Rivers in DKI Jakarta Province

Most of inland water in DKI Jakarta Province are highly polluted caused by the increase in urbanization, industrialization development and reclamation process. This research intend to conduct an initial characterization of the water quality in Jakarta. The survey was conducted in 9 location namely Kali Sunter 1, Kali Sunter 2, Cakung Drain, POM Vyle Pluit, Waduk Pluit, Museum Bahari, WTC Mangga Dua, Mookenvart and Pesanggrahan. Based on the level of salinity, the rivers are categorized into fresh water (Cakung Drain, WTC Mangga Dua, Mookenvart and Pesanggrahan) and brackish water (Kali Sunter 1, Kali Sunter 2, Pluit Village, Waduk Pluit, and Museum Bahari). The physicochemical measurement using Water Quality Checker reported turbidity and Total Dissolved Solid (TDS) concentration were very high at all sampling locations. The Oxidation Reduction Potential (ORP) value can be used to determine the pollution status. Pesanggrahan is the only river with a positive ORP value of 22 mV. It can be said that the pollution level of the Pesanggrahan is very low. The other rivers have a negative ORP value and the largest is in Kali Sunter 2. Serious efforts need to be made in dealing with inland waters pollution located in Jakarta.

Structural Alterations in Fibrin Clots with Dextran

SummaryTheoretical reasoning underlying physicochemical measurement of opacity ratio of fibrin clots, i. e. the ratio of turbidity at 350 nm and 608 nm is given. From such considerations it is deduced that opacity ratio may be used to characterise clot morphology : opacity ratio will be inversely related to the size of inhomogeneities formed in the clot.A highly reproducible technique for the measurement of opacity ratio is described. Additions of small amounts of dextran to fibrinogen solution consistently decrease the opacity ratio of clots made subsequently. This decrease which indicates that the inhomogeneities forming in such fibrin clots are larger than control, is independent of the molecular weight of dextran, but is related to the logarithm of the final dextran concentration. Both thrombin and fibrinogen concentrations are also determinants of opacity ratio. Electron microscopy of fibrin clots made in the presence of dextran confirms that such clots have an altered morphology. Properties of clots in relationship to their structural morphology are discussed.