Judul: Aktivitas Diuretik Fraksi Heksan dan Etil Asetat Ekstrak Etanol Daun Alpukat (Persea americana Mill.) pada Tikus Sprague-Dawley
Abstrak: The aim of this study is to determine diuretic activity of hexane and ethyl acetate fraction of ethanol extract avocado leaves in Sprague-Dawley rats. The result of phytochemical screening on hexane and ethyl acetate fraction of ethanol extract avocado leaves showed the existing of flavonoid and tannin. Thirty rats were used in this study, divided into six groups: aquadest as normal control (A), furosemid 1.8 mg/kg bw as positive control (B), ethyl acetate fraction of ethanol extract avocado leaves 100 mg/kg bw (C) and 300 mg/kg bw (D), and hexane fraction of ethanol extract avocado leaves 100 mg/kg bw (E) and 300 mg/kg bw (F) as treatments which were studied. Lipschitsz method was applied in this study by taking each treatment material with doses 1 ml/100gram bw to the rats by orally. Diuretic activity was evaluated by measuring volume and pH of urine and observing urine’s color. Urine’s volume measured in 24 hours. Hexane fraction of ethanol extract avocado leaves 300 mg/kg bw showed the most optimum result with 24.7 ml urine’s volume and supported by urine’s color which was the brightest one.
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Judul: PengaruhFraksi N-HeksanDaunAlpukatterhadapGambaranUreumdanKreatininPadaTikus
Abstrak: The objective of this study was to determine the influence of avocado leaves n-hexane fraction on ureum and creatinine description of Sparague-Dawley rats, induced by ethylene glicol (EG) 0.75 % and ammonium choloride(AC) 2%. Twenty adult male rats were devided into four treatment groups. The first group was normal group (A) that had not been given any special treatment. Second group was treated EG/AC but not avocado leavesn-hexane fraction. In addition to EG/AC treatment, two groups of rats were also gavage-administratedn-hexane fraction of avocado leaves dose of 100 mg/ Kg BW (C) and n-hexane fraction of avocado leaves dose 300 mg/Kg BW(D). Rat blood serum was taken before and after treatment. The result of this study showed that on the ureum and creatinine parameters value were not differences among each group statistically (P>0.05), but ureum and creatinine on D group were higher compared with other groups. Body weight of rats on B, C and D groups was decreased, but body weight of rats on D group was more decreased than B and C groups. The results of this research could be concluded that n- heksan was not good fraction for alvocado leaves and n-hexane fraction of avocado leaves dose 300 mg/ Kg BW and 100 mg/ Kg BW could not decrease ureum and creatinine plasma value.
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Judul: Desain Sistem Transfer Energi Nirkabel Berbasiskan Tesla Coil
Abstrak: Tesla coil merupakan alat yang ditemukan oleh Nikola Tesla yang dapat mentransmisikan daya tanpa kabel dengan memanfaatkan prinsip induksi elektromagnetik. Pada penelitian ini dibuat sebuah prototype Tesla Coil dengan menggunakan transistor C1970 dan receiver menggunakan rangkaian LC. Identifikasi alat meliputi pengaruh daya input transmitter terhadap receiver, bentuk signal yang dipancarkan transmitter, pengaruh jarak transmitter dan receiver, nilai efisiensi serta efek alat terhadap perangkat lain. Hasil pengamatan menunjukkan bahwa semakin besar daya input maka semakin besar daya yang dipancarkan oleh transmitter. Bentuk sinyal yang dipancarkan oleh transmitter berupa gelombang listrik AC sinusoidal dengan frekuensi ~2.9 MHz. Semakin jauh jarak receiver terhadap transmitter maka semakin kecil amplitudo gelombang AC yang diterima oleh receiver, menyebabkan semakin kecil daya yang diterima oleh receiver. Adapun nilai efisiensi terbesar penangkapan daya oleh receiver yaitu sebesar 0.00516 % serta terdapat gangguan pada alat-alat tertentu seperti monitor komputer dan radio.
Keyword: rangkaian LC, receiver, tesla coil, transistor C1970, transmitter