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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 2 Documents
 1 
Search results for , issue "Vol. 16 No. 2 (1983)" : 2 Documents clear
Cross Infectivity Study of Four Subspecies of Oncomelania hupensis in Four Geographical Strains of Schistosoma Japonicum M. Sudomo
Journal of Mathematical and Fundamental Sciences Vol. 16 No. 2 (1983)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Four subspecies of Oncomelania hupensis, namely O.h.lindoensis, O.h.hupensis, O.h.nosophora and O.h.quadrasi were exposed to miracidia of four different geographical strains of Schistosoma japonicum, i.e.: the Chinese, Japanese, Philippine and lndonesian strains. Result of this experiments showed that O.h.lindoensis from Indonesia and O.h.hupensis from China found to be the most susceptible for all geographical strains of S.japonicum while O.h.quarasi from the Philippines was the most refractory and could only be infected with the Philippine strain. Sari. Empat subspecies Oncomelania hupensis: O.h. lindoensis, O.h. hupensis, O.h. nosophora, dan O.h. quadrasi telah dicoba diinfeksikan di dalam laboratorium dengan miracidia dan berbagai strain Schistosoma japonicum. Strain S. japonicum yang dipakai untuk menginfeksi keempat subspecies O. hupensis tersebut adalah strain Cina, Jepang, Filipina dan Indonesia sendiri. Hasil percobaan ini menunjukkan bahwa O.h. lindoensis dari Indonesia dan O.h. hupensis dari Cina ternyata paling tidak rentan dan hanya dapat diinfeksi oleh S. japonicum dari strain Filipina sendiri.
Sintesis 1-bromopentadekana dari Asam Heksadekanoat; dengan Metode Hunsdiecker yang Dimodifikasikan Harun Halim
Journal of Mathematical and Fundamental Sciences Vol. 16 No. 2 (1983)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Haloalkana dapat dibuat dengan berbagai cara. Pembuatan 1-haloalkana mendapat kesulitan baik dengan cara melalui raksi karbonium maupun reaksi radikal. Hal ini disebabkan karena baik dalam reaksi karbonium maupun reaksi radikal, radikal dan karbonium primer kurang stabil bila dibandingkan dengan yang sekunder maupun tertiernya. Dengan metode husdiecker pembuatan ini masih mungkin karena diantara tahap-tahap reaksi terdapat reaksi. Cristol dan Firth memodofikasi metode Husdiecker ini dengan menggunakan merkurioksida sebagai ganti perakoksida. Di dalam percobaan ini reaksi diikuti dengan memperhatikan gelembung-gelembung CO2 dalam "bubbler". Bila tidak terjadi lagi gelembung maka reaksi dianggap telah selesai. Hasil yang diperoleh hanya 27%. Di sini dibahas tahap-tahap reaksi yang bersaing dan yang menentukan hasil akhir. Abstract. Haloalkane can b e prepared by defferent methods. The preparation of 1-haloalkane, specially the long chained one, faces difficulties, through carbonium reaction as well as through radical reaction. This is because primary carbonium ions as well as primary radical intermediates are both less stable than the secondary and tertiary one. Using the Hunsdiecker method the preparation is still possible because among the reactions steps the following reaction occurs which practically goes to completion. Cristol and Firth modified this method by using mercurieoxide instead of silveroxjde. In this experiment mercurioxide is also used. The reaction is followed by observing CO2 bubbles in the bubbler. When there are no bubbles formed in the bubbler the reaction is assumed to be complete. The yield is only 27%. In this paper is discussed the competing reactions steps which determine the final yield.

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