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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 3 Documents
 1 
Search results for , issue "Vol. 11 No. 2 (1977)" : 3 Documents clear
The Use of Solar Radiation in Agricultural Processing S. P. Chow; Allen C. Brailey
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 2 (1977)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Recent solar radiation data in different parts of Malaysia indicates that Malaysia has an abundant  energy resource that could be tapped and used for agricultural processing. A brief survey on the potential uses of this solar energy is given and mention is made of the types of application, the products and processes involved. Examples for Malaysian agricultural products are used. Ringkasan. Data terakhir mengenai radiasi matahari di beberapa tempat yang berbeda-beda di Malaysia memberikan indikasi bahwa Malaysia memiliki sumber enersi yang berlebihan yang dapat digunakan untuk pengolahan hasil-hasil pertanian. Suatu penelaahan mengenai potensi penggunakan enersi matahari diberikan secara singkat dan disebutkan pula beberapa jenis penggunaan, macam hasil olahan dan cara pengolahan yang terlibat. Beberapa hasil pertanian Malaysia digunakan sebagai contoh.
Cara Identifikasi Cepat untuk Asam Bongkrek dalam Bahan Makanan P. Soedigdo; Lubna Ali; Soekeni soedigdo
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 2 (1977)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Ringkasan. Di sini dikemukakan suatu metoda lapisan tipis yang cepat dan baik untuk mengidentifikasi adanya asam bongkrek di dalam bahan makanan dengan menggunakan Silica gel G, H atau GF dan sistem eluen methanol-etilasetat (1 : 1; v/v). Identifikasi noda-noda dilakukan di bawah sinar UV atau dengan uap iodium. Harga Rf yang diperoleh dibandingkan dengan harga Rf zat standar asam bongkrek. Ekstraksi asam bongkrek dilakukan sebagai berikut: 10 gram bahan makanan yang dikeringkan diekstraksi dengan 30 ml petroleum 'eter (t.d. = 40' "“ 60') pada suhu kamar. Lalu ekstrak petroleum eter ini dikocok dengan 10 ml NH4OH 2%. Lapisan ammonia ini nantinya yang dikromatografi lapisan tipis.  Abstract. A rapid thin-layer chromatographic procedure was described for the identification of bongkrekic acid in foodstuffs using Silica gel G, H or GF and the system methanol-ethyl acetate (1 : 1; v/v). The toxin was visualized under UV or by exposure to iodine vapour. Then the obtained Rf values were compared with those of the authentic compound. The extraction of bongkrekic acid was done as follows: 10 grams of the dried and grounded foodstuff was extracted with 30 mL of petroleum ether (b.p. = 40°-60°) at room temperature. Then the obtained extract was well shaken with 10 mL of 2% NH40H solution and this extract was used for TLC determinations.
Transmission Electron Microscope Studies of Sclerotia of Sclerotinia Sclerotiorum (Lib.) de Bary Buddy Dani Kosasih
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 2 (1977)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The ultrastructure of cells of the Sclerotia of Sclerotinia sclerotiorum (Lib.) de Bary was studied by electron microscopy. A mature sclerotium of S. sclerotiorum contains several types of differentiated cells. The thick-waller rind cells which comprise the sclerotial envelope are empty and have a rough outer electron-dense layer which is absent from the other walls. A mucilaginous sheath was observed around medullary hyphae and the cell contains comprise typical neclei, mitochondria, lipid bodies, Woronin bodies, endoplasm with a surrounding plasmalemna and a sparse endoplasmic reticulum and lomasomes. Ringkasan. Pengamatan jamur penyebab penyakit tumbuhan, Sclerotinia sclerotiorum (Lib.) de Bary dengan menggunakan mikroskop electron telah dikerjakan dalam laporan ini, terutama sekali mengenai sklerotium yang telah masak yang terdiri dari bebrapa macam sel yang berbeda-beda. Bagian luar sekali yang merupakan kulit dari pada sklerotium disebut "rind", terdiri dari sel-sel yang berdinding tebal, kaku, kosong dan banyak menerima electron (electrondense layer). Macam dinding sel bagian lainnya. Sedangkan bagian dalamnya yang disebut "medullary hyphae" selalu diselubungi oleh lapisan tebal dan kenyal yang disebut "mucilaginous sheath". Sel-sel tersebut mengandung berbagai bagian seperti inti, mitokondria, benda-benda lemak, benda-benda Woronin, plasma-dalam yang dikelilingi oleh dinding plasma (plasmalemma), reticulum plasma-dalam dan lomasom, seperti pada sel-sel Ascomycetes lainnya.

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