Judul: Kajian penggunaan berbagai bahan aditif pada media transportasi tertutup terhadap kelulushidupan benih ikan nila Oreochromis niloticus
Abstrak: Ikan Nila merupakan salah satu komoditas yang memiliki tingkat pembudidayaan yang cukup tinggi di sektor ikan air tawar di Indonesia sehingga memerlukan penanganan transportasi dengan baik untuk penyaluran benihnya. Sistem transportasi yang digunakan pada penelitian yaitu transportasi benih ikan nila sistem tertutup. Penggunaan bahan aditif pada media transportasi dilakukan dengan tujuan mempertahankan kondisi lingkungan media serta melakukan penurunan metabolisme ikan selama pengangkutan berlangsung. Penelitian dilakukan dengan metode studi pustaka berhubungan dengan penambahan bahan aditif pada transportasi benih ikan nila sistem tertutup. Bahan aditif yang dianalisis di antaranya bahan anestesi (ekstrak akar tuba, ekstrak bunga kamboja, dan ekstrak daun bandotan) dan sebagai stabilizer kualitas air pada media transportasi berupa zeolit, karbon aktif dan garam. Penggunaan garam, zeolit, dan karbon aktif sebagai stabilizer kualitas air dapat digunakan pada sistem transportasi yang membutuhkan waktu yang lebih dari 10 jam sedangkan untuk waktu dibawah atau sama dengan 10 jam maka dapat menggunakan ekstrak daun bandotan sebagai bahan anestesi untuk menurunkan laju metabolisme pada ikan., Tilapia is a commodity that has a fairly high level of aquaculture in the freshwater fish sector in Indonesia, so it requires proper transportation handling for the distribution of seeds. The transportation system used in this study is the closed system of tilapia seed transportation. The use of additives in the transportation media is carried out with the aim of maintaining the environmental conditions of the media and reducing fish metabolism during transportation. The research was conducted using the literature study method related to the addition of additives in closed system tilapia seed transportation. The additives analysis included anesthetic agents (tuba root extract, frangipani flower extract, and bandotan leaf extract) and as stabilizers for air quality in transport media in the form of zeolite, activated carbon and salt. The use of salt, zeolite, and activated carbon as air quality stabilizers can be used in transportation systems that require more than 10 hours while for times below or equal to 10 hours, bandotan leaf extract can be used as an anesthetic agent to reduce the metabolic rate in fish.
Keyword: additives, tilapia, survival rate, transportation

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: 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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