Judul: Isolasi dan Karakterisasi Protein Ikan Tongkol (Auxis thazard), Kerang Hijau (Perna viridis)
Abstrak: Seafoods including fish, crustaceans and shellfish play an important role in human nutrition. However, it is also recognised as an important cause of food allergies, especially in coastal countries, including Indonesia. Treatments of these diseases still rely on avoiding the sources of the alergens, however it can also cause malnutrition which is also dangerous to health. To determine the specific food protein causing allergic reactions, cutie test was performed using isolate food protein. Until the present time, Indonesia still imports kits containing isolate proteins for food allergy diagnosis, therefore effort to locally produce the kit will reduce health cost for patients with allergic diseases. The objective of this study was to produce seafoods protein extract that is potential to be used as isolate of allergens for food allergy diagnosis. Two extract sarcoplasmic and myofibril protein were obtained from fish, shrimp and mussel by extraction in phosphate buffer with diference ionic strength Protein profile were then detected by means of sodium dodecyl polyacrylamide gel electrophoresis (SDS-PAGE). IgE binding pattern was analyzed by using ELISA and immunoblotting using sera from 20 respondents with histories of food allergy. The result of the study showed that samples of seafood extract protein consist of several protein with various molecular weight in the range about 14 to 143 kDa. The component were identified as tropomyosin (34-38 kDa), parvalbumin (~12 kDa), myosin light chain (~17.5 kDa) and arginin kinase (40 kDa) which are major allergens in seafoods. Further analysis with ELISA showed that the seafood protein extracts contained several IgE-binding proteins. Immunoblot of three extract samples from seafoods showed that components identified as allergens to each allergic subject have different molecular weight. The results demonstrated that crude extract could be directly used as isolate allergen for diagnostic test allergy (skin prick test) without isolating the major allergen components.
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Judul: Isolasi dan karakterisasi protein ikan tongkol (Auxis thazard), kerang hijau (Perna viridis) dan udang jerbung (Penaeus merguiensis) untuk pembuatan isolat alergen
Abstrak: Seafoods including fish, crustaceans and shellfish play an important role in human nutrition. However, it is also recognised as an important cause of food allergies, especially in coastal countries, including Indonesia. Treatments of these diseases still rely on avoiding the sources of the alergens, however it can also cause malnutrition which is also dangerous to health. To determine the specific food protein causing allergic reactions, cutie test was performed using isolate food protein. Until the present time, Indonesia still imports kits containing isolate proteins for food allergy diagnosis, therefore effort to locally produce the kit will reduce health cost for patients with allergic diseases. The objective of this study was to produce seafoods protein extract that is potential to be used as isolate of allergens for food allergy diagnosis. Two extract sarcoplasmic and myofibril protein were obtained from fish, shrimp and mussel by extraction in phosphate buffer with diference ionic strength Protein profile were then detected by means of sodium dodecyl polyacrylamide gel electrophoresis (SDS-PAGE). IgE binding pattern was analyzed by using ELISA and immunoblotting using sera from 20 respondents with histories of food allergy. The result of the study showed that samples of seafood extract protein consist of several protein with various molecular weight in the range about 14 to 143 kDa. The component were identified as tropomyosin (34-38 kDa), parvalbumin (~12 kDa), myosin light chain (~17.5 kDa) and arginin kinase (40 kDa) which are major allergens in seafoods. Further analysis with ELISA showed that the seafood protein extracts contained several IgE-binding proteins. Immunoblot of three extract samples from seafoods showed that components identified as allergens to each allergic subject have different molecular weight. The results demonstrated that crude extract could be directly used as isolate allergen for diagnostic test allergy (skin prick test) without isolating the major allergen components.
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Judul: Bifurkasi Hopf pada Model Siklus Bisnis Kaldor Kalecki tanpa dan dengan Waktu Tunda
Abstrak: Business cycle model is one of dynamical system models in economic. One of the business cycles model is Kaldor-Kalecki model. Kaldor-Kalecki business cycle model that is written in delayed defferential equations, is a business cycle model that involves gross product and capital stock of a company. In this paper Kaldor-Kalecki business cycle model is analyzed using both nondelay and delay in time of capital stock. By Taylor expansion for the time delayed model, an analysis of stability around the fixed points has been done. Furthermore, by using Hopf bifurcation theorem, it can be shown that there exists periodic orbits and limit cycle. In the nondelayed model, changing the parameter of goods market could lead to the occurrence of Hopf bifurcation and the existence of limit cycle. Similarly, for the delayed model, it has been shown that changing the time delay parameter may result in the occurrence of Hopf bifurcation and limit cycle.
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