Judul: Addition of Sweet Potato Leaf Extract (Ipomoea batatas) to Tilapia Fish Seed Transportation (Oreochromis niloticus) with a Closed System
Abstrak: Sistem transportasi merupakan hal yang penting dalam proses distribusi ikan karena berpengaruh dengan tingkat stres ikan selama transportasi dan pascatransportasi, kandungan ekstrak pada daun ubi jalar seperti polifenol yang bersifat sebagai pemberi efek relaksasi dan halusinasi selama proses transportasi. Penelitian ini bertujuan untuk menganalisis pengaruh penambahan ekstrak daun ubi jalar (Ipomoea batatas) pada transportasi benih ikan nila (Oreochromis niloticus) dengan sistem tertutup selama 24 jam terhadap kualitas air, glukosa darah, tingkat kelangsungan hidup, dan pertumbuhan pascatransportasi. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan tiga perlakuan dan tiga ulangan. Perlakuan terdiri dari perlakuan kontrol (K), penambahan ekstrak sebanyak 0,25% (A1), penambahan ekstrak sebanyak 0,5% (A2). Penambahan ekstrak dengan dosis 0,25% meningkatkan nilai tingkat kelangsungan hidup sebesar 92% dibandingkan perlakuan lainnya., The transportation system is important in the fish distribution process because it affects the stress level of fish during and after transportation, the extract content in sweet potato leaves such as polyphenols that act as relaxants and hallucinogenic effects during the transportation process. This study aims to analyze the effect of adding sweet potato leaf extract (Ipomoea batatas) to the transportation of tilapia seeds (Oreochromis niloticus) with a closed system for 24 hours on water quality, blood glucose, survival, and post-transportation growth. This study used a completely randomized design (CRD) with three treatments and three replications. The treatments consisted of treatment control (K), addition of 0.25% extract (A1), addition of 0.5% extract (A2). The addition of extract with a dose of 0.25% increased survival by 92% compared to other treatments.
Keyword: daun ubi jalar, ikan nila, transportasi

Judul: Addition of guava leaf extract to improve water quality and survival of tilapia (Oreochromis niloticus) in closed transportation
Abstrak: Kegiatan transportasi merupakan salah satu penyebab kematian ikan nila (Oreochoromis niloticus). Jauhnya jarak tempuh, penurunan kandungan oksigen terlarut, akumulasi karbon dioksida, tingginya kadar total amonia nitrogen, dan terganggunya parameter kualitas air dapat memicu stres pada ikan. Penambahan ekstrak daun jambu biji (Psidium guajava) diharapkan menjadi solusi alternatif. Penelitian bertujuan menganalisis pengaruh penambahan ekstrak daun jambu biji pada kegiatan transportasi tertutup dan pasca transportasi terhadap tingkat kelangsungan hidup, kualitas air, glukosa darah, dan pertumbuhan ikan. Penelitian menggunakan rancangan acak lengkap dua perlakuan dan satu kontrol dengan tiga ulangan. Dosis perlakuan mengacu pada hasil uji lethal concentration (LC50). Transportasi dilakukan 24 jam dan pemeliharaan setelah transportasi 21 hari. Hasil penelitian dosis 0,50% (JB2) memberikan nilai kualitas air yang lebih optimal dan perubahan kadar glukosa darah yang relatif lebih rendah dengan kontrol dan 0,25% (JB1). Selain itu, penambahan dosis 0,50% menghasilkan tingkat kelangsungan hidup 10% lebih besar dari kontrol dan setelah 21 hari pemeliharaan, penambahan dosis 0,25% dan 0,50% memberikan tingkat kelangsungan hidup 3% lebih tinggi dari kontrol. Kesimpulan penelitian ini, penambahan ekstrak daun jambu biji sebanyak 0,50% dari total volume air transportasi yang digunakan pada ikan nila memiliki pengaruh signifikan terhadap tingkat kelangsungan hidup, kualitas air selama transportasi, dan glukosa darah ikan setelah transportasi., Transportation activities are the causes of tilapia (Oreochoromis niloticus) mortality. Long distance traveled, decreased dissolved oxygen, carbon dioxide accumulation, high levels of ammonia nitrogen, and disruption of water quality parameters can trigger stress in fish. The addition of guava leaf extract (Psidium guajava) expected to be an alternative solution. Analyze the effect of the addition of guava leaf extract in closed and post-transportation activities on survival rate, water quality, blood glucose, and fish growth. The study used a completely randomized design with two treatments and one control with three replicates. The treatment dose refers to the results of the lethal concentration (LC50) test. Transportation was carried out 24 hours and maintenance after transportation was 21 days. The results of the study showed that the dose of 0.50% (JB2) provided more optimal water quality values and relatively lower changes in blood glucose levels with the control and 0.25% (JB1). In addition of a dose of 0.50% resulted in a survival rate 10% greater than the control and after 21 days of rearing, the addition of doses of 0.25% and 0.50% provided TKH 3% higher than the control. In conclusion, the addition of guava leaf extract as much as 0.50% of the total volume of transportation water used in tilapia has a significant effect on survival rate, water quality during transportation, and fish blood glucose after transportation.
Keyword: Kualitas air, Oreochromis niloticus, Transportasi

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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