Judul: Produktivitas Fenolik, Flavonoid, dan Kapasitas Antioksidan Adenostemma lavenia Pada Naungan dan Konsentrasi Hara Berbeda.
Abstrak: Variasi naungan dan konsentrasi hara pada budidaya tanaman obat Adenostemma Lavenia menggunakan metode hidroponik dapat menghasilkan produktivitas fenolik, flavonoid, dan kapasitas antioksidan yang berbeda. Kadar fenolik, flavonoid, dan kapasitas antioksidan ditentukan menggunakan spektrofotometri UV-Vis. Hasil penelitian menunjukkan kombinasi tanpa naungan dan 600 ppm hara menghasilkan produktivitas fenolik tertinggi sebesar 7,68±1,67 μmol Gallic Acid Equivalent/g tanaman, Kombinasi naungan 25% dan 1000 ppm hara menghasilkan produktivitas flavonoid tertinggi sebesar 0,58±0,34 μmol Quercetin Equivalent/g tanaman, dan kombinasi tanpa naungan dan 600 ppm hara menghasilkan produktivitas kapasitas antioksidan tertinggi sebesar 536,23±117,66 μmol Ascorbic Acid Equivalent/g tanaman. Hasil terbaik yaitu pada produktivitas flavonoid kombinasi tanpa naungan dan konsentrasi 800 ppm. Kata kunci: Adenostemma lavenia, fenolik, konsentrasi hara, naungan, kapasitas antioksidan. ABSTRACT FATIMAH SYAM KARSONO PUTRI. Analysis of Productivity Phenolic, Flavonoid, and Antioxidant Capacity of Adenostemma lavenia under Different Light Conditions and Nutrient Concentrations.. Supervised by IRMANIDA BATUBARA and TAOPIK RIDWAN. Variations in shading levels and nutrient concentrations in the cultivation of the medicinal plant Adenostemma lavenia using hydroponic methods can lead to distinct yields of phenolic compounds, flavonoids, and antioxidant capacity. The levels of phenolic compounds, flavonoids, and antioxidant capacity were determined using UV-Vis spectrophotometry. The research results revealed that the combination of no shading and 600 ppm nutrient concentration resulted in the highest phenolic productivity of 7.68±1.67 μmol Gallic Acid Equivalent per plant. The combination of 25% shading and 1000 ppm nutrient concentration yielded the highest flavonoid productivity of 0.58±0.34 μmol Quercetin Equivalent per plant. Additionally, the combination of no shading and 600 ppm nutrient concentration exhibited the highest antioxidant capacity productivity of 536.23±117.66 μmol Ascorbic Acid Equivalent per plant. The optimal outcome was observed in the flavonoid productivity of the no shading and 800 ppm nutrient concentration combination. Keywords: Adenostemma lavenia, antioxidant capacity, nutrient concentration, shade, phenolic compounds.
Keyword: Adenostemma lavenia, fenolik, konsentrasi hara, naungan, kapasitas antioksidan

Judul: Terpenoid Productivity and Toxicity of Adenostemma lavenia of Hydroponic Cultivation Results with Shade Variation and Nutrient Concentration
Abstrak: Upaya budi daya tanaman obat khususnya Adenostemma lavenia dapat dilakukan dengan metode hidroponik. Hidroponik dipilih karena dapat merekayasa kondisi lingkangan seperti naungan dan konsentrasi hara. Naungan berkaitan dengan intensitas cahaya matahari dan berpengaruh terhadap fotosintesis, sedangkan hara dibutuhkan tanaman untuk menunjang pertumbuhan dan perkembangan. Tujuan penelitian ini mendapatkan kombinasi perlakuan naungan dan konsentrasi hara yang optimum untuk menghasilkan produktivitas terpenoid dan toksisitas tertinggi dari A. lavenia yang dibudidayakan secara hidroponik. Kadar terpenoid ditentukan berdasarkan spektrofotometri UV-Vis dan uji toksisitas menggunakan metode Brine Shrimp Lethality Test. Hasil penelitian menunjukkan kombinasi 25% naungan dan 1.000 ppm hara menghasilkan produktivitas terpenoid tertinggi sebesar 11,21±1,25 mg nerol ekuivalen (NE)/tanaman. Berdasarkan uji probit, sebagian besar ekstrak A. lavenia menunjukkan sifat toksik (LC50 < 1.000 ppm), kombinasi 25% naungan dan 600 ppm menghasilkan LC50 terkecil sebesar 431,96± 27,83 ppm, Efforts to cultivate medicinal plants, especially Adenostemma lavenia can be made by hydroponic methods. Hydroponics was chosen because it can engineer environmental conditions like shade and nutrient concentration. Shade is related to the intensity of sunlight and affects photosynthesis, while plants need nutrients to support growth and development. The purpose of this study was to obtain a combination of shade treatment and optimal nutrient concentration to produce the highest terpenoid productivity and toxicity from hydroponically cultivated A. lavenia. Terpenoid levels are determined based on UV-Vis spectrophotometry and toxicity tests using the Brine Shrimp Lethality Test method. The results showed that the combination of 25% shade and 1,000 ppm of nutrients resulted in the highest terpenoid productivity of 11,21±1,25 mg Nerol Equivalent (NE)/plant. Based on probit assays, most A. lavenia extracts exhibit toxic properties (LC50 < 1.000 ppm), a combination of 25% shade and 600 ppm produced the smallest LC50 of 431,96± 27,83 ppm
Keyword: Adenostemma lavenia, terpenoids, Toxicity, nutrient concentration, shade

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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