Telah dilakukan penelitian tentang identifikasi daging buah kopi Robusta (Coffea robusta) yang berasal dari provinsi Aceh. Sampel yang digunakan berasal dari Kabupaten Aceh Tengah dan Kabupaten Gayo Lues. Metode identifikasi meliputi skrining fitokimia, analisis kadar air dan analisis kadar timbal (Pb). Untuk pengujian skrining fitokimia daging buah kopi berasal dari kabupaten Aceh Tengah diperoleh hasil kandungan senyawa alkaloid, flavonoid dan polifenol, sedangkan untuk kabupaten Gayo Lues diperoleh kandungan senyawa alkaloid, flavonoid, terpenoid dan polifenol. Pada pengujian analisis kadar air pada daging buah kopi robusta asal Kabupaten Aceh Tengah sebesar 78 %, sedangkan Kabupaten Gayo Lues sebesar 90 %. Kemudian analisis kadar timbal, untuk kabupaten Aceh Tengah diperoleh sebesar 0,0984 ppm dan kabupaten Gayo Lues sebesar 0,0783 ppm.

AbstrakSel elektrokimia merupakan pemanfaatan arus listrik yang dihasilkan dari sebuah reaksi kimia ataupun arus listrik yang menyebabkan terjadinya suatu reaksi kimia. Pemanfaatan sel elektrokimia banyak digunakan untuk menghasilkan teknologi terbarukan. Sel elektrolisis dan sel Volta merupakan hasil terapan dari sel elektrokimia yang menggunakan media elektroda dan larutan elektrolit. Sampai saat ini, sel elektrokimia masih memiliki peranan penting di dalam kemajuan teknologi modern mulai industri otomotif maupun rumah tangga.Kata kunci: Sel elektrokimia, listrik, elektrolisis, Volta, elektroda. AbstractThe electrochemical cell is the utilization of the electric current generated from a chemical reaction or electrical current that causes a chemical reaction. The application of electrochemical cells used to produce renewable technologies. Electrolysis cells and Volta applied cell is the result of an electrochemical cell that uses media electrodes and an electrolyte solution. Recently, the electrochemical cell has an important role in the advancement of modern technology from the automotive and also households industry.

Electrophoresis is a method of separation that utilizes the electric field generated from electrodes to separate compounds having a charge of cations or anions. Electrophoresis requires separation media in the form of a stationary phase such as Agarose cells mixed with a buffer solution to maintain the acidity of the sample during the separation process. This tool strongly supports the renewal of research, especially in the field of genetic engineering technology. The result will provide a track record of separation bands of compounds. The speed of molecular motion depends on the ratio (ratio) of charge to its mass, and also depends on the shape of the molecule.

Snakehead fish (Channa striata) is a freshwater fish with high economic value both as ornamental and consumed fish. However, the ability to adapt to fluctuating environmental states prompts snakehead fish to be susceptible to parasites, ectoparasites, and endoparasites. Gills, skin, and fins are the major body parts that are often infected with ectoparasites. This study aims to discover the macro pathology in gills, skin, and fins of ectoparasites-infected snakehead fish and its histopathology. This study was conducted from April to June 2021. Observational data on macro pathology and histopathology were analyzed qualitatively. The results indicated that the macro pathology of the skin, gills, and fins of snakehead fish infected with ectoparasites indicates discoloration, excess mucus production, the dull coloration of the gills, and irritation of the gills body surfaces, and skin hemorrhages. In conclusion, infection of ectoparasites affects several alterations in the skin, gills, and fins, both macro pathological and histopathological.

Inhibitory Activity of S. aureus and E. coli bacteria of a waste of Aceh's Robusta fruit flesh. Coffee fruit flesh is a waste that coffee farmers use as animal feed only, even though has a composition such as carbohydrates, proteins, fiber, minerals, water, protein, caffeine, and polyphenols. These compositions are very useful for cosmetic and pharmaceutical industries. This study was a research on the use of waste of Aceh's Robusta fruit flesh (Coffea robusta) on the ability to inhibit the bacteria S-aureus and E.coli as the basic ingredients of the cosmetic face mask of halal products. The samples used were from Takengon city. The skin of the coffee beans was peeled, cleaned and extracted with methanol for about 3 x 24 hours. Further concentrated until obtained extract concentrated. The resulting extracts were tested phytochemically. Variations of extracts concentration on water solvents were 1%, 2%, and 3%. The antibacterial activity was tested by the diffusion method which used the disc. The result showed inhibitory zone to E.coli bacteria at 1%, 2%, 3% concentration were 6,5 mm, 7.2 mm and 7.8 mm respectively. While in S.aureus at a concentration of 1%, 2%, 3% were 15.1 mm, 15.3 mm and 15.5 mm respectively. The best variation of the concentration of Robusta coffee fruit flesh extract (Coffea robusta) in this study on the growth of S-aureus and E.coli bacteria was 3%.