Judul: Studi Pustaka Suplementasi Magnesium pada Pakan untuk Pertumbuhan Ikan Nila Oreochromis sp.
Abstrak: Mineral merupakan suatu elemen anorganik yang diperlukan hewan untuk mempertahankan berbagai fungsi metabolik. Mineral berperan penting pada fungsi enzim termasuk di dalamnya berperan dalam sistem pencernaan, keseimbangan asam basa, pertukaran gas, dan osmoregulasi. Mg beserta ikatannya banyak terlibat dalam berbagai peran berbeda dalam alur metabolisme protein, lemak, karbohidrat, dan reaksi enzimatis. Studi pustaka ini bertujuan memvalidasi dan menganalisis dosis magnesium terbaik yang ditambahkan pada pakan untuk performa pertumbuhan ikan nila Oreochromis sp., berdasarkan laporan hasil-hasil penelitian yang sudah dilakukan. Sumber pustaka didapatkan dari pustaka nasional dan internasional. Hasil studi pustaka ini menunjukkan suplementasi Mg memberikan dampak positif pada pertumbuhan ikan nila. Kebutuhan Mg pada pakan ikan nila (Oreochromis sp.) dipengaruhi oleh spesies dan ukuran ikan, sumber, serta kandungan mineral pada pakan dan kondisi lingkungan budidaya. Dosis optimum suplementasi Mg pada ikan nila Oreochromis sp. adalah 0,62 g kg-1 berdasarkan hasil analisis regresi kuadratik orde-2 yang berada di rentang 0,5-1,02 g kg-1., Minerals are inorganic elements that animals need to maintain various metabolic functions. Minerals plan an important role in enzyme function, including their role in digestion system, acid-base balance, gas exchange, and osmoregulation. Mg and its mixtures are involved in many different roles in the metabolic pathways of proteins, fats, carbohydrates, and enzymatic reactions. This literature study aims to validate and analyze the best dose of magnesium added to feed for the growth performance of tilapia Oreochromis sp., based on reports of research results that have been carried out. Literature sources were obtained from national and international literatures. The result of this literature study show that Mg supplementation has a positive impact on the growth of tilapia. Mg requirements of tilapia (Oreochromis sp.) is influenced by species and size of the fish, source, and content of the mineral in feed and culture environment. The optimum dose of Mg supplementation for tilapia Oreochromis sp. are 0.62 g kg-1 based on 2nd order quadratic regression analysis which is in the range of 0.5-1.02 g kg-1.
Keyword: dose, growth, magnesium, mineral, tilapia, dosis, magnesium, mineral, nila, pertumbuhan

Judul: Studi Pustaka Suplementasi Zat Besi (Fe) pada Pakan untuk Peningkatan Pertumbuhan Ikan Nila (Oreochromis sp.)
Abstrak: Zat besi (Fe) merupakan mikromineral yang berperan dalam transportasi oksigen dan respirasi sel melalui aktivitas reduksi oksidasi dan transfer elektron. Asupan Fe perlu ditambahkan melalui pakan karena jumlah Fe yang larut di air yang dapat diserap oleh membran insang dan mukosa usus ikan terbatas. Zat besi (Fe) yang ditambahkan ke pakan terbagi menjadi dua, yaitu zat besi organik (FeAA) asam amino chelate dan zat besi anorganik (FeSO4) besi sulfat. Studi pustaka ini bertujuan memvalidasi dan menganalisis jumlah dosis zat besi (Fe) terbaik yang ditambahkan pada pakan untuk meningkatkan performa pertumbuhan ikan nila (Oreochromis sp.). Pengumpulan sumber pustaka dilakukan dengan mengunduh jurnal nasional terakreditasi, jurnal internasional, skripsi, tesis, dan disertasi. Bentuk suplementasi Fe yang dikaji dalam studi pustaka ini berupa FeSO4. 7H2O, FeC6H5O7. H2O dan Fe2O3. Hasil studi pustaka ini bahwa penambahan Fe dapat meningkatkan performa pertumbuhan serta memberikan nilai FCR yang optimum pada ikan nila dengan dosis 50-150 mg kg-1., Iron (Fe) is a micromineral that plays a role in oxygen transportation and cellular respiration through oxidation-reduction and electron-transfer activities. Fe intake needs to be added through feed because the amount of water-soluble Fe that can be absorbed by the gill membrane and intestinal mucosa of fish is limited. Iron (Fe) added to feed is divided into two, namely organic iron (FeAA) amino acid chelate and inorganic iron (FeSO4) ferrous sulfate. This literature study aims to validate and analyze the best amount of iron (Fe) dosage added to feed to improve the growth performance of tilapia (Oreochromis sp.). Literature sources were collected by downloading accredited national journals, international journals, theses, and dissertations. The forms of Fe supplementation reviewed in this literature study are FeSO4. 7H2O, FeC6H5O7. H2O and Fe2O3. The result of this literature study is that the addition of Fe can improve growth performance and provide an optimum FCR value in tilapia at a dose of 50-150 mg kg-1.
Keyword: growth, iron, literature study, nile tilapia

Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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