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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 689 Documents
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Pengaruh Endoxan-Asta terhadap Pertumbuhan Embrio Ayam yang Disuntikkan pada Macam-macam Umur Pengeraman Sri Sudarwati; Tien Wiati Suryono
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 3 (1978)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The influence of Endoxan-Asta (cyclophosphamide) on the development of chicken embryos has been investigated by injecting the substance into the yolk sac of 2-,3-, 4-, 5-,6-, and 7-day old embryos. The 4- and 5-day old embryos were found to be the most affected by injecting 0,04 mg Endoxan per egg. The younger the embryo when Endoxan is administered, its influence of the development of long bones of the leg is shifted for the tarso-metatarsus to the tibio-tarsus (towards the bones which are situated more proximally). In all experiments done, ectopia viscerum is the most obvious malformation. It has been proven clearly, that Endoxan caused stunted growth.
Penutupan dengan Asbes Dapat Memperbaiki Sifat Mekanik dari Sambungan Baja dengan Las Busur Listrik Trisno Trisno; A. Sulaiman; H. Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 3 (1978)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Ringkasan. Sifat-sifat mekanik yang penting dari sambungan las adalah kekuatan dan keuletan. Kedua sifat ini dapat diuji dengan pengujian tarik, pengujian takik dan pengujian kekerasan. Kedua sifat utama tersebut sangat tergantung dari perlakuan lanjut yang dikenakan pada sambungan yang dimaksud. Di dalam penelitian ini dibandingkan pengaruh dari tiga perlakuan lanjut terhadap kedua sifat mekanik tersebut di atas pada sambungan las baja dengan busur listrik. Ketiga perlakuan lanjut yang dimaksud adalah: (a) tanpa perlakuan apa-apa, (b) dipanaskan dalam tungku pada temperature 650'C selama setengah jam dan diikuti dengan pendinginan di dalam tungu dan (c) ditutup dengan asbes segera setelah selesai pengelasan lapisan las yang terakhir. Hasil penelitian menunjukkan bahwa penutupan dengan asbes menghasilkan sifat-sifat mekanik yang lebih baik dari pada pengelasan yang tidak diikuti dengan perlakuan apa-apa, walaupun belum menyamai hasil dari pengelasan yang mendapat perlakuan lanjut dengan pemanasan di dalam tungku. Abstract. The important mechanical properties in welding technology are strength and ductility of the welded joint. These two properties can be examined through tensile testing, impact testing and hardness testing. It has been known that those two properties are influenced by the post treatment imposed to the welded joint. In this work, those properties were studied on electric arc welded joints of steel plates which have undergone three different post treatments. The three treatments are: (a) without post treatment,  (b) heated in the furnace at 650° C for half an hour followed by furnace cooling and (c) covering the weld with asbest immediately after the last pass of welding process. Results of the study shows that covering the weld with asbests produces better mechanical properties than that without treatment, eventhough  it is still inferior compared to the one which has been heated in the furnace. Due to the incomplexity and uncostly of the asbest-covered post treatment, it is necessary to study further the development of this treatment process for practical use.
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.
Morphology and Anatomy of the Inflorescence Axis and Flowers in Arenga Porphyrocarpa (Palmae) E.B. Hidajat
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 1 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. In Arenga Porphyrocarpa the vegetative axis is terminalised by the onset of the hapaxanthic flowering axis. This is accompanied by a reduction of leaf size. The part of the axis beyond the last node transforms into a female inflorescence which consists of a system of rachillae on which the individual flowers are attached. Male inflorescences develop afterwards on the remaining nodes but may also develop from the most distal node later on. Additional female inflorescence may develop at lower nodes. Monopodial branching is not confined to  the reproductive axis only but occurs also in the branching system of  the inflorescence. Although flowers occur solitary at the female rachilla or in pairs generally at the male rachilla, ontogenetic examination shows that the basic pattern is a flower cluster of three. At the female rachilla only the central latest developing flower matures while at the male rachilla only the two marginal flowers develop. Presumably the type of branching in a flower cluster follows a sympodial pattern. In the female flower, the stipitate gynoecium contains two ovules which not may be of the same size. The stigmatic region leads to a cleft like stylar canal. Three staminodia occur at the female flower. The male flower carries 19-20 stamens each one consisting of a short filament and a long latrorse anther. Ringkasan. Pada Arenga porphyrocarpa, sumbu vegetative berakhir dengan perkembangan sumbu reproduktif yang mengikuti cara berbunga hapaxanthic. Hal tersebut diiringi oleh reduksi gradual ukuran daun. Bagian sumbu di atas buku terakhir berkembang menjadi perbungaan betina yang terdiri atas sistim rachilla dengan kuntum-kuntum bunga. Perbungaan jantan berkembang sesudah itu pada buku-buku lain tetapi dapat pula berkembang pada buku paling distal. Demikian pula perbungaan betina lain kemudian dapat berkembang pada buku lebih rendah. Percabangan monopodial tidak hanya terdapat pada sumbu reproduktif melainkan juga pada sistim percabangan dalam perbungaan. Meskipun kuntum bunga terdapat sendiri-sendiri pada rachilla betina atau umumnya berpasangan pada rachilla jantan, namun pengamatan ontogeny menunjukkan bahwa pola dasar bagi pertumbuhan adalah kelompok yang terdiri atas tiga kuntum bunga. Pada rachilla betina hanyalah bunga tengah, yang berkembang paling akhir, tumbuh jadi dewasa. Pada rachilla jantan hanya kedua bunga tepi tumbuh sampai dewasa. Diduga bahwa percabangan dalam kelompok bunga mengikuti pola sympodial. Pada bunga betina gynoecium stipitate beris dua buah bakal biji yang tidak sama besar. Daerah stigma bersambung dengan saluran stylus berbentuk celah. Tiga helai staminodia berbentuk filament terdapat pada bunga betina. Bunga jantan memiliki 19-20 stamen yang masing-masing terdiri atas filamen pendek dan anther panjang dan latrors.
Formation and Structure of Sclerotia and the Occurenceof Microconidia of Sclerotinia Sclerotiorum (Lib.) De Bary Buddy Dani Kosasih
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 1 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. The development of sclerotia, structure and microconidia of Sclerotinia Sclerotiorum are described. Sclerotial initials are formed by hyphal strands which branched dichotomously to give a small knot and bound the hyphae together and then became solid masses which were spherical to irregular in shape. The mature sclerotium are blackand consists of three distinct regions, the outermost layer is a rind, within the rind is a cortex and the centre of the sclerotium is a medulla. Microconidia are readily produced in cultures of the fungus but no evidence was found of microconidial clusters forming within the sclerotium.Ringkasan. Pertumbuhan sklerotia, struktur serta pembentukan mikrokonidia pada Sclerotinia sclerotiorum, suatu jamur penyebab penyakit tumbuhan, telah dipelajari. Bakal sklerotia dibentuk di ujung-ujung hifae yang bercabang secara "dichotam", kemudian membentuk suatu bulatan kecil dan akhirnya menjadi massa yang padat, berbentuk bular atau tidak beraturan. Sklerotia yang sudah tua berwarna hitam dan terdiri dari tiga bagian yaitu bagian luar sekali disebut "rind", kemudian diikuti bagian "cortex" dan bagian tengah sekali adalah "medulla". Dalam perbenihan, jamur tersebut dapat membentuk mikrokonidia, tetapi pembentukan ini dalam sklerotia tidak terdapat.
Origin of Widmanstatten Microstructure in Homogenized Ag-Sn Dental Alloys Harsono Wirjosumarto; Richard S. Mateer
Journal of Mathematical and Fundamental Sciences Vol. 11 No. 1 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract. Widmanstatten microstructures are often observed in Ag-Sn dental alloys, after they underwent slow cooling for homogenization temperature. This structure appears when the alloy contains silver or silver equivalent between 75 and 80 wt %. Hatchet mark structure somewhat similar to Widmanstatten structure may be generated during the metallographic preparation of the specimens. These marks are actually mechanical twins resulted from the plastic deformation during the process of grinding and polishing. Ringkasan. Struktur Windmanstatten yang timbul pada logam dental Ag-Sn disebabkan oleh proses pendinginan lambat paduan tersebut dari suhu homogenisasi. Hal ini terjadi bila paduan tersebut mengandung perak atau ekivalen perak antara 75 "“ 80% berat. Dalam proses preparasi specimen untuk penelitian metalogradi, garis-garis serupa dengan struktur Widmanstatten dapat timbul. Garis-garis ini sebenarnya adalah struktur kembar mekanis (mechanical twins) yang terjadi karena deformasi plastic pada proses penggerindaan dan pemolesan.
Growth of Human Dermal Fibroblasts on Polyvinyl Alcohol-Silk Fibroin Nanofiber Scaffold Regina Giovanni; Untung Ari Wibowo; Hermawan Judawisastra; Anggraini Barlian
Journal of Mathematical and Fundamental Sciences Vol. 51 No. 3 (2019)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Skin tissue engineering is a developing technology to heal severe wounds. Combining polyvinyl alcohol (PVA) and silk fibroin (SF) nanofibers is a promising method of developing a skin scaffold because the resulting structure mimics collagen fibers. The aim of this research was to study the growth of human dermal fibroblasts (HDF) on a polyvinyl alcohol-silk fibroin (PVA-SF) nanofiber scaffold that was produced by electrospinning. Morphological characterization and chemical analysis of the scaffold were performed by scanning electron microscopy (SEM), Fourier transform infrared spectrophotometry (FTIR), and contact angle measurement. The biocompatibility of the scaffold was tested by MTT cytotoxicity assay, SEM analysis, adherence ratio calculation, and analysis of the HDF growth curve for 9 days. The FTIR results confirmed the presence of SF and PVA. The average fiber diameter and pore size of the PVA scaffold were greater than those of the PVA-SF scaffold. Both scaffolds had hydrophilic properties and were not cytotoxic. Thus, HDF can attach and grow on both types of scaffold better than HDF seeded on a polystyrene plate. In conclusion, the addition of SF to the PVA nanofibers caused bead formation, which affected the substrate topography, decreased hydrophilicity and also decreased the fiber diameter and pore size in the nanofiber scaffold compared to the PVA nanofiber scaffold without SF addition. SF addition increases cell attachment to the nanofiber scaffold and has potential to facilitate HDF cell growth.
Beberapa Aspek Biologis Ikan Genggehek, Mistacoleucus marcinatus (C.V.) (Cyprinidae) dari Waduk Jatiluhur, Jawa Barat H.S. Hardjasasmita; T. Wiati Surjono; Hardjono Hardjono
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Penelitian mengenai beberapa aspek biologis ikan genggehek, Mystacoleucus marginatus (CV) dari waduk (danau buatan) Jatiluhur dekat Purwakarta, Jawa Barat, telah dilakukan pada tahun 1974 dan awal tahun 1975. Plankton hewani dan nabati bersama-sama dengan detritus adalah obyek-obyek makana yang sering didapat di dalam saluran pencernaan makanan ikan genggehek. Hubungan antara kematangan gonad dan panjang standar ikan menunjukkan kolerasi positip yang kuat. Telah ditentukan ukuran minimum ikan jantan dan betina yang sudah mulai dewasa atau sudah pernah berbiak; demikian pula persamaan garis regresi hubungan panjang berat. A study on some biological aspects of the genggehek fish (Mistacoleucus marginatus (C.V.)) has been carried out at the Jatiluhur man-made lake near Purwakarta, West Java, in the year of 1974 and early 1975. Zooplankton, phytoplankton and detritus are the main food objects found in the digestive tract of the genggehek fish. The maturity of the gonad has good positive correlation with the standard length of the fish. The minimum size of the nature fishes and the length-weight relation has been also determined. 

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