PENERAPAN PEMBELAJARAN TEMATIK UNTUK MENINGKATKAN AKTIVITAS BELAJAR KELAS I SD

Abstrak: Masalah pada penelitian ini adalah usaha untuk meningkatkan aktivitas belajar peserta didik melalui pembelajaran tematik di kelas I Sekolah Dasar Negeri 18 Siantan. Metode penelitian ini adalah metode deskriptif, bentuk penelitian yaitu penelitian tindakan kelas (PTK), dan sifat penelitian bersifat kolaboratif, subjek penelitian yaitu guru dan peserta didik kelas I Sekolah Dasar Negeri 18 Siantan yang berjumlah 26 orang. Teknik yang digunakan dalam penelitian ini adalah teknik observasi langsung, teknik dokumenter, dan alat pengumpul data yang digunakan adalah lembar observasi. Hasil penelitian berdasarkan observasi melalui pembelajaran tematik dapat meningkatkan aktivitas belajar peserta didik. Hal ini menunjukkan bahwa hipotesis yang menyatakan penerapan pembelajaran tematik di kelas I Sekolah Dasar Negeri 18 Siantan dapat meningkatkan aktivitas belajar peserta didik, diterima. Kata kunci : Pembelajaran tematik, Aktivitas belajar Abstract: The problem in this research is an attempt to improve the learners' learning activities by using thematic approach at the first grade students in the Elementary School 18 Siantan. This research method is descriptive, in classroom action research, and the nature of this research is qualitative research, the research subjects are teacher and learners elementary school first grade students in the Elementary School 18 Siantan which consisted of 26 people in whole. The techniques used in this research were the technique of direct observation, documentary technique, and data collection tool were used as observation guidelines. The result based on observation by using thematic approach had improved learners learning activities. This shows that the hypothesis that stated the application of thematic approach at the first grade in the  Elementary School 18 Siantan can improve learners' learning activities, accepted. Keywords: Learning Activity, Thematic approac

Effects of Fe fertilizer eluate on the growth of Sargassum horneri at the germling and immature stages

To aid in the restoration of coastal barren ground areas, it is important to clarify the effects of chelated iron on the growth of seaweed. In particular, for the further development of practical methods to promote seaweed growth, Fe-binding organic ligands, such as humic substances (HSs) composed of humus materials, rather than Fe-binding inorganic ligands, such as ethylenediaminetetraacetic acid (EDTA), should be investigated. In this study, the effects of an Fe fertilizer, made from HSs and steelmaking slag, on the growth of the brown alga Sargassum horneri at the germling and immature stages were examined. The addition of the Fe fertilizer eluate containing Fe organic ligand complexes clearly promoted the growth of S. horneri at the germling and immature stages. It was also clear that the effect of Fe concentration in the Fe fertilizer eluate on the growth rate was almost the same as that of Fe–EDTA. Moreover, the addition of the Fe fertilizer eluate had a great effect on the brown color of S. horneri thalli and promoted the increased content of photosynthetic pigments, such as chlorophyll a. Based on these experimental results, the application of the Fe fertilizer containing Fe organic ligand complexes is expected to become an effective method for the restoration of the barren ground phenomenon in Fe-deficient coastal areas. © 2015 Springer Science+Business Media DordrechtEmbargo Period 12 month

Erratum to: Contrasting effects of blue and red LED irradiations on the growth of Sargassum horneri during the germling and immature stages

The original version of this article unfortunately contained a mistake. Figure 7 was incorrect. The correct Figure is given below: (Figure presented). © 2017, Springer Science+Business Media Dordrecht.Embargo Period 12 month

Contrasting effects of blue and red LED irradiations on the growth of Sargassum horneri during the germling and immature stages

The brown seaweed Sargassum horneri (Sargassaceae) is important for marine environment conservation. It could be used for a food material, medical applications, and future biofuel production. We compared the growth of S. horneri cultures under single wavelength blue and red light during the germling and immature stages. The growth rate based on the thallus area of S. horneri during the germling stage was faster under blue LED light than under red LED light. Furthermore, based on the wet weight of S. horneri, during the immature stage, blue LED light resulted in a faster growth rate than red LED light. Moreover, during the immature stage, compared with red LED light, blue LED light tended to increase the content of photosynthetic pigments. We conclude that use of blue LED light in indoor tanks during the germling and immature stages will improve the efficiency of S. horneri culture. © 2016 Springer Science+Business Media DordrechtEmbargo Period 12 month