A transcription of Rugh's geometrical approach to temperature is given for classical Heisenberg spin systems. For the simple case of a paramagnet with small and large numbers of spins we verify the approach. A numerical check for long spin chains using spin dynamics shows its practicality.
Making use of the Rugh's micro-canonical approach to temperature we study XY-spin systems by the strictly energy conserving over-relaxation algorithm. In this micro-canonical simulation the temperature and also the specific heat are determined as averages of expressions easy to implement. The XY-chain is studied for a test. The second order transition on a cubic lattice and the first order transition on fcc lattice are analyzed in greater detail to have a more severe test about the feasibility of this micro-canonical method.
Brown algae, Sargassum cristaefolium is grown abundant in Indonesia especially in South Sulawesi Province. In vitro anticoagulant effect of the extract has been shown. Therefore a study of Sargassum cristaefolium, used to inhibit blood coagulation in vivo was done. In this study, effect of flavonoid compounds from Sargassum cristaefoilum to elongate bleeding and blood clotting time and also (Prothrombin Time (PT) and Activated Thromboplastin Time (APTT) tests were carried out. Moreover, histology of mice stomach was also studied. From this study we found, that effect on bleeding time after 14 days treatment of Sargassum extract in vivo prolonged the clotting and bleeding time significantly (p < 0.05). Prothrombin time (PT) and activated partial thromboplastin time (APTT) tests on plasma confirm these research. From this study we conclude, that the flavonoid compound in Sargassum cristaefolium exhibited an anticoagulant activity.
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