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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. 1 (1976)" : 3 Documents clear
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.

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