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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 4 Documents
 1 
Search results for , issue "Vol. 7 No. 1 (1973)" : 4 Documents clear
Geothermy and its Future in Indonesia M.T. Zen
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The basic concept of a commercial steamfield is discussed and defined in this paper. Based on this discussion potential areas are indicated in a map. It is found that not less 24 geotherrnal areas are prospectable. However, it is found that very little is known about the exact potential of Indonesia in the field of geothermy. Anticipating the rising demand in electricity within the context of the broader industrialisation program of Indonesia and the limitation of its fossil fuel reserve, it is suggested that all possibilities for utilising different kinds of energy, including geothermy should be explored as far as possible. Ringkasan. Konsep dasar dari suatu medan uap alam komersil diperbincangkan dan didefinisikan. Berdasarkan pada diskusi tersebut daerah-derah dengan potensi geothermy dicantumkan ke dalam peta. Ternyata bahwa tak kurang dari 24 medan hyperthermal tersebar di seluruh wilayah Indonesia yang berkemungkinan untuk dapat dieksplorasikan lebih lanjut. Saying sekali bahwa sangat sedikit yang diketahui mengenai potensi Indonesia sesuangguhnya dalam bidang ini. Menghadapi permintaan tenaga listrik yang semakin menanjak dalam rangka pengembangan program industrialisasi Indonesia, dan terbatasnya persediaan bahan bakar fossil, pengarang menganjurkan agar semua segi dan kemungkinan pemanfaatan segala macam sumber energi , termasuk geothermy, dijajaki sejauh mungkin.
Mesodermal Competence of the Presumptive Ecto-Neuroderm at Various Developmental Stages, in Xenopus laevis (Daudin) Sri Sudarwati
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. A comparative study on the reactive capacity of the presumptive ecto-neuroderm on mesoderm formation with increase of age has been done in Xenopus Laevis. It was proved that before gastrulation, mesoderm induction mainly produces dorsal mesodermal structures. During the gastrulation process the product of differentiation tends to shift from dorsaL to ventral mesodermal structures. The presumptive ecto-neuroderm has has already a competence for mesoderm formation at the early blastula stage and this competence starts to fade out at the horse-shoe-shaped blastopore stage.  Ringkasan. Suatu studi perbandingan mengenai kapasitas berreaksi dalam membentuk mesoderm dari presumptive ekto-neuroderm dengan bertambahnya umur, telah dilakukan pada Xenopus laevis. Telah dibuktikan, bahwa sebelum gastrulasi induksi mesoderm terutama menghasilkan struktur-struktur mesoderm dorsal. Selama proses gastrulasi berlangsung, hasil differensiasi cenderung untuk menggeser dari struktur-struktur mesoderm dorsal ke struktur-struktur mesoderm ventral. Presumptif ekto-neuroderm telah mempunyai kompetensi untuk membentuk mesoderm pada stadium blastula muda dan kompetensi tersebut mulai menghilang pada stadium blastoporus berbentuk sepatu kuda. 
Efek Stimulatif dari Bacteria terhadap Pembentukan Tubuh-Buah Djamur Padi (Volvariella volvacea (Fr.) Sing.) U. Suriawiria
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Penelitian terhadap ada tidaknya efek stimulatif dari bakteria tertentu terhadap pembentukan tubuh-buah djamur padi (Volvariella volvacea (Fr.) Sing.) telah dilakukan dalam kondisi semi steril. Ternjata bahwa adanja bakteria tertentu merangsang pembentukan tubuh-buah djamur padi. Abstract. A study has been made on the stimulative effect of certain specific bacteria upon fruit body formation of rice straw mushroom (Volvariella volvacea (Fr.) Sing.) under semi-sterile condition. It was shown that the presence of specific bacteria stimulated fruit body formation of rice straw mushroom. 
Penentuan Deradjat pada Pembusukan pada Udang P. Soedigdo; Rochestri Ijad; Tan Hwie Liep
Journal of Mathematical and Fundamental Sciences Vol. 7 No. 1 (1973)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Ringkasan. Pembusukan pada udang adalah suatu akibat kerdja enzima2 hidrolitik berasal dari udang sendiri dan djuga dari bakter2 jang ada pada udang. Hasil penelitian menjatakan bahwa aktivitas spesifik SH-protease udang ber-angsur2 menurun selama proses pembusukan, sehingga sifat ini baik untuk dipakai sebagai kriteria pembusukan udang. Aktivitas enzima ditentukan pada 37oC selama 20 menit dengan 1% kasein dalam 0,1 M buffer fostat pH 8 sebagai substrat dan siteina (0,02 M) sebagai activator. Sebagai larutan enzima dipakai homogenat udang dalam 0,1 M buffer fosfat pH 8. Berdasarkan atas sifat penurunan aktivitas spesifik SH-protase dan kenaikan pH dan kadar trimetilamina udang pada proses pembusukan, maka dapatlah disusun suatu penggolongan deradjat kesegaran udang. Hal ini dapat penting untuk keperluan2 dalam praktek.Abstract. Spoilage of shrimps is largely caused by enzyme action especially by shrimp proteases in addition to microbial action which is also enzymatic in nature. It was found that when spoilage is in progress the specific activity of the shrimp SH-proteases is remarkably decreased. It appeared that this is a suitable criterion for the determination of the degree of spoilage. Enzyme activity determinations were carried out at 37°C with 1% of casein in 0.1 M phosphate buffer of pH S as the substrate and cysteine (0.02 W as the activator). Shrimp homogenate was used as the enzyme solution which was prepared in 0.1 M phosphate buffer of pH 8 at 0-4°C. Based on the decrease of SH-protease activity and on the increase of pH and volatile base (trimethylamine etc.) content a classification of the freshness of shrimps can be made, which might be useful for practical purposes.

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