Judul: Production of Fruiting Body and Nutritional Content  of White Oyster Mushroom (Pleurotus sp.) of HS isolate on Coconut Coir and  Rice Straw Substrates
Abstrak: Jamur tiram putih (Pleurotus sp.) banyak dibudidayakan masyarakat karena memilki kandungan gizi yang tinggi dan biaya produksi yang cukup murah. Sabut kelapa dan jerami padi termasuk limbah pertanian yang mengandung selulosa, hemiselulosa dan lignin yang berpotensi digunakan sebagai substrat tumbuh jamur tiram. Penelitian ini dilakukan untuk mengamati pertumbuhan dan kandungan gizi Pleurotus sp. isolat HS dalam 500 gram media pada substrat yang berbeda yaitu jerami padi (JR), sabut kelapa (SK) serta campuran jerami padi dan sabut kelapa (JRSK). Fase vegetatif Pleurotus sp. HS pada SK (31 hari) lebih lama daripada JR (27 hari) dan JRSK (28 hari), sedangkan fase reproduktifnya pada substrat JR dan JRSK (17 hari) lebih lama daripada SK (12 hari). Efisiensi biologisnya pada JR (42%) dan JRSK (31,53%) lebih tinggi daripada SK (15,76%). Kadar abu, protein, dan lemak Pleurotus sp. HS pada substrat JRSK masing-masing 12,18%, 24,47%, dan 1,76% lebih tinggi daripada JR masing-masing 8,56%, 18,79%, dan 0,95%, sedangkan kadar seratnya pada JRSK (7,43%) lebih tinggi daripada SK (5,69%) dan lebih rendah daripada JR (10, 59%)., White oyster mushrooms (Pleurotus sp.) are widely cultivated by the community due to their high nutritional content and relatively low production costs. Coconut coir and rice straw are agricultural wastes that contain cellulose, hemicellulose, and lignin which can be potential to be used as substrates for growing oyster mushrooms. This study was conducted to observe the growth and nutritional content of Pleurotus sp. HS on different substrate combinations in 500 grams of media, namely Rice Straw (JR), coconut coir (SK), and a combination of rice straw and coconut coir (JRSK). The vegetative phase of SK (31 days) was longer than JR (27 days) and JRSK (28 days). The reproductive phase of JR and JRSK (17 days) was longer than SK (12 days). The biological efficiency of JR (42%) and JRSK (31,53%) is higher than SK (15,76%). The ash, protein, and fat content of JRSK (12,18%, 24,47%, and 1,76% respectively) were higher than JR (8,56%, 18,79%, and 0,95% respectively). The fiber content of JRSK (7,43%) is higher than SK (5,69%) and lower than JR (10,59%).
Keyword: biological efficiency, fiber content, protein, reproductive phase, vegetative phase

Judul: Growth and Production Of Oyster Mushroom (Pleurotus spp.) on Media Containing Sengon Wood, Coffee Skin, and Straw
Abstrak: Jamur tiram merupakan salah satu kelompok jamur kayu yang dapat dimakan (edible). Pemanfaatan limbah hasil kehutanan dan pertanian seperti serbuk gergaji kayu sengon, kulit kopi, dan jerami menjadi salah satu yang dapat dimanfaatkan sebagai media tanam dalam kultivasi jamur tiram guna memaksimalkan limbah yang ramah lingkungan. Penelitian bertujuan untuk menganalisis pengaruh media yang mengandung kayu sengon, kulit kopi, dan jerami terhadap pertumbuhan dan produksi jamur tiram. Penelitian menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal dengan 3 perlakuan media yaitu formula 1 (kayu sengon dan kulit kopi), formula 2 (kayu sengon dan jerami), dan kontrol (kayu sengon). Hasil penelitian menunjukkan bahwa fase vegetatif jamur paling singkat diperoleh pada media formula 2 (15-18 hari). Fase generatif jamur yang membutuhkan waktu paling cepat masa panen diperoleh pada media kontrol (9-11 hari). Total bobot basah jamur terbesar dan nilai efisiensi biologis tertinggi diperoleh pada media kontrol (229,10 g) dengan nilai efisiensi biologis 79,0% pada jamur tiram putih (Pleurotus ostreatus) dan (331,70 g) pada jamur tiram cokelat (Pleurotus cystidiosus) dengan nilai efisiensi biologis 114,4%., Oyster mushroom is a group of edible wood mushrooms. Utilization of forestry and agricultural waste such as sawdust from sengon wood, coffee husks, and straw is one that can be used as a planting medium in oyster mushroom cultivation in order to maximize environmentally friendly waste. This study aims to analyze the effect of media containing sengon wood, coffee skin, and straw on the growth and production of oyster mushrooms. The study used a single factor completely randomized design (CRD) with 3 media treatments, namely formula 1 (sengon wood and coffee husk), formula 2 (sengon wood and straw), and control (sengon wood). The results showed that the shortest fungal vegetative phase was obtained in formula 2 media (15-18 days). The fungal generative phase wich required the fastest time to harvest was obtained in control media (9-11 days). The highest total wet weight of mushrooms and the highest biological efficiency value obtained on control media (229,10 g) with a biological efficiency value of 79,0% on white oyster mushroom (Pleurotus ostreatus) and (331,70 g) on brown oyster mushroom (Pleurotus cystidiosus) with a biological efficiency value of 114,4%.
Keyword: brown oyster mushroom, coffee husk, sengon wood, straw, white oyster mushroom.

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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