Judul: Potensi Media Log Dan Ranting Jabon (Anthocephalus Cadamba) Untuk Kultivasi Jamur Kuping, Jamur Tiram Dan Lentinus Serta Komposisi Kimia Jamur
Abstrak: Log dan ranting kayu jabon (Anthocephalus cadamba) dapat menjadi alternatif substrat yang potensial untuk budidaya jamur. Tujuan penelitian ini adalah untuk menganalisis potensi log dan ranting jabon sebagai substrat untuk kultivasi jamur serta menganalisis komposisi kimia tubuh buah jamur. Isolat jamur yang digunakan adalah dua isolat jamur kuping (Auricularia sp.) yaitu jamur kuping cokelat (KPC) dan jamur kuping merah (KPM); dua isolat jamur tiram (Pleurotus ostreatus) yaitu jamur tiram putih (TR) dan jamur tiram abu (HO); dan satu isolat jamur Lentinus (LE). Tahapan kultivasi dalam penelitian ini yaitu pembuatan substrat, pembibitan, perawatan dan pengamatan pertumbuhan jamur. Tahapan analisis yaitu analisis komponen gizi berupa protein, serat kasar, lemak, dan kabohidrat; serta analisis bioaktif berupa β-glukan dan vitamin B3. Hasil penelitian menunjukkan bahwa log dan ranting jabon berpotensi menjadi substrat yang baik untuk kultivasi jamur kuping, jamur tiram dan jamur Lentinus. Efisiensi Biologi pada jenis jamur kuping dengan substrat ranting jabon (117.6–143.5%) lebih besar dibandingkan Efisiensi Biologi pada substrat log jabon (27.4–31.6%). Hasil analisis komponen kimia tubuh buah jamur menunjukkan bahwa jamur kuping mengandung β-glukan tertinggi yaitu 45-46% basis kering. Jamur tiram mengandung vitamin B3 relatif tinggi yaitu 282.3 mg/100g jamur kering. Jamur Lentinus mengandung protein, serat kasar, kandungan lemak dan karbohidrat total tertinggi berdasarkan berat basah dengan nilai berturut-turut yaitu 5.4, 3.9, 0.4, dan 17.7%.
Keyword: Jabon, kultivasi, jamur kuping, jamur tiram, Lentinus

Judul: Analisis Kultivasi Jamur Kuping (Auricularia sp.) pada Log Kayu dan Ranting Sengon, Jabon dan Jati
Abstrak: One of the alternative media for ear mushroom (Auricularia sp.) cultivation is by using cutting wastes of log and twigs. The objective of this research is to analyze the potency of ear mushroom cultivation by using log and twigs from three species e.g sengon (F. moluccana), jabon (A. cadamba) and jati (T. grandis). This research is completely randomized design with 8 treatments of logs and twigs from the trees species, baglog from sengon sawdust nutrition given (BIO) and sengon sawdust only (CS). Fresh weight of ear mushroom from jabon stem (171.4 g) was higher than other treatments, except BIO treatment (248.4 g). Biology efficiency (EB) of jabon twigs (39.8%) is significantly higher than the other treatments, except for BIO treatment (67.6 %). The average of harvesting time of teak log (36 days) and teak twigs (34 days) were significantly higher than the other treatments. The results clearly showed that log and twigs from that three species could be used for ear mushroom cultivation media to substitute the use of sawdust.
Keyword: T. grandis. Cultivation media, F. moluccana, Auricularia sp., A. cadamba

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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