Judul: Rencana penataan kawasan wisata berkelanjutan di Danau Toba Sumatera Utara (Kasus: Sub DAS Naborsahon)
Abstrak: Lake Toba is the biggest lake in South East Asia, in the middle of which Samosir Island occurs, is located at 906-1800 m above sea level with mountainous landscape providing natural freshness and lake visual potential. The natural beauty of Lake Toba makes this region one of potential tourism spots, locallyand internationally. Nowadays, both physical and visual scenic qualities of this region have been declining which are affected by the increasing number of visitation and mushrooming of tourism infrastructures.
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Judul: Coastal Landscape Management in Adapting to Shoreline Changes in Samosir Island
Abstrak: Kemenparekraf menetapkan lima destinasi super prioritas di Indonesia, salah satunya adalah Danau Toba. Danau Toba dan Pulau Samosir saling berkaitan dalam menghadapi ancaman, salah satunya yaitu perubahan garis pantai. Hal ini mengakibatkan aksesibilitas, prasarana dan sarana tidak berfungsi dengan baik. Sedangkan sebagai daerah yang sedang melakukan pengembangan kawasan pariwisata, aspek aksesibilitas dan ketersediaan prasarana dan sarana sangat berpengaruh. Tujuan dari penelitian adalah; 1) menganalisis perubahan garis pantai, 2) menganalisis dampak perubahan garis pantai terhadap objek pariwisata, dan 3) menyusun rekomendasi pengelolaan lanskap pesisir. Analisis perubahan garis pantai dilakukan dengan metode spasial dan data kuantitatif, analisis dampak perubahan garis pantai diperoleh dan disajikan menggunakan metode deskriptif kualitatif, dan rekomendasi pengelolaan diperoleh menggunakan metode Strengths, Weakness, Opportunities and Threats (SWOT). Hasil penelitian menunjukkan tahun 2010 dan 2020 Danau Toba mengalami penurunan permukaan air sedalam 0.74 m. Perubahan garis pantai membuat dermaga tidak dapat berfungsi maksimal. Selain itu, prasarana dan sarana belum adaptif mengakibatkan fenomena semakin padatnya area objek pariwisata. Kondisi ini berada di kuadran III, sehingga diperlukan upaya defensif berupa peningkatan fungsi dermaga, mengevaluasi prasarana dan sarana, dan memberdayakan para pengelola dan masyarakat lokal., The Ministry of Tourism and Creative Economy has set five super priority destinations in Indonesia, one of which is Lake Toba. Lake Toba and Samosir Island are interconnected in facing threats, one of which is shoreline changes. This results in accessibility, infrastructure and facilities not functioning properly. Meanwhile, as an area that is developing a tourism area, the aspect of accessibility and availability of infrastructure and facilities is very influential. The aims of the research are; 1) analyzing shoreline changes, 2) analyzing the impact of shoreline changes on tourism objects and 3) compiling recommendations for coastal landscape management. Analysis of shoreline change was carried out using spatial methods and quantitative data, analysis of the impact of shoreline changes was obtained and presented using descriptive qualitative methods, and management recommendations were obtained using the Strengths, Weaknesses, Opportunities and Threats (SWOT) methods. The results showed that in 2010 and 2020 Lake Toba experienced a decrease in water level of 0.74 m. Changes in shoreline make the pier unable to function optimally. In addition, the infrastructure and facilities have not been adaptive resulting in the phenomenon of the increasingly dense tourism object area. This condition is in quadrant III, so defensive efforts are needed in the form of improving the function of the wharf, evaluating infrastructure and facilities, and empowering managers and local communities.
Keyword: accessibility, tourism object, infrastructure and facilities

Judul: Validation method for determination of apigenin in extract celery with high performance liquid chromatography
Abstrak: Apigenin is an active substance derived from celery (Apium graveolens) and widely used for the treatment of gout. Determination method of apigenin which have been validated was introduced by Frankee et al. J Food Compos Anal 17: 1-35 (2005). Apigenin analysis was done by high performance liquid chromatography (HPLC). To make sure that HPLC analysis method can be used for the intended purpose then the method was validated. Parameters determined on method validation were linearity, limit of detection, limit of quantification, precision, and accuracy. All parameters were in accordance with the acceptance criteria of Association of Official Analytical Chemist. The linearity in the concentration of 3,8; 5,7; and 7,6 mg/l had correlation coefficent of 0,9900–0,9998. limit of detection in this method was 2,7222 mg/l and limit of quantification was 8,2500 mg/l. Interday precision in five restating showed good precision with relative standard deviation of 3,85%. Accuracy was determined by standard addition method with recovery percentage of 95,00–118,77%. Average concentration of apigenin is 0,0052% (w/w).
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