The current study provided a comparison the antioxidant activity, total phenolic and total flavonoid contents of propolis in two different types of honey bees and location. The material used for this research were propolis which was produced by different honey bees, namely Apis mellifera and Trigona sp in different location from Batu and Mojokerto. The method used was descriptive analysis. Findings suggested the maximum and minimum of antioxidant activity were obtained by propolis Trigona sp. from Mojokerto (987.24 µg/g) and propolis Trigona sp. from Batu (166.25 µg/g). The maximum and minimum of total flavonoid content were obtained by propolis Apis mellifera from Mojokerto (1.990 mg/g) and propolis Trigona sp from Mojokerto (1.000 mg/g). The maximum and minimum of total fenolic content were obtained by propolis Apis mellifera from Mojokerto (21.980 mg/g) and propolis Trigona sp from Mojokerto (9.603 mg/g). Propolis Apis mellifera from Mojokerto had a higher total flavonoids and phenolic content and Trigona sp. from Mojokerto had lowest of antioxidant activity, total flavonoids and total phenolics.
ABSTRAKGenerator sinkron merupakan mesin-mesin listrik yang berfungsi untuk mengkonversi energi mekanik menjadi energi listrik. Generator sinkron mempunyai permasalahan yaitu ketidakstabilan tegangan pada saat perubahan beban, sehingga dibuthkan peralatan yang dapat mengendalikan kestabilan tegangan generator sinkron yaitu Automatic Voltage Regulator(AVR).Automatic Voltage Regulator (AVR) merupakan sebuah divais pengatur tegangan yang digunakan pada generator sinkron untuk menyetabilkan tegangan keluaran yang dihasilkan dari generator sinkron. Automatic Voltage Regulator (AVR) bekerja dengan mengatur arus penguatan (excitacy) pada eksiter, apabila beban bertambah maka Automatic Voltage Regulator (AVR) akan memerintahkan eksiter untuk berkerja dengan menambah arus eksitasi sebaliknya apabila beban berkurang maka Automatic Voltage Regulator (AVR) akan memerintahkan eksiter untuk mengurangi arus eksitasi.
ABSTRAKPenelitian ini bertujuan untuk menguji pengaruh pembatasan waktu makan terhadap konsentrasi hormon tiroid dan metabolit darah ayam broiler selama periode pembatasan dan pemulihan. Sebanyak 400 ekor ayam broiler unsexed strain Lohmann umur 7 hari ditempatkan pada 5 perlakuan dengan menggunakan rancangan acak lengkap dan dianalisa menggunakan ANOVA. Perlakuan terdiri atas: ransum yang diberikan ad libitum (R-0); ransum yang disediakan 2 jam pada pagi hari dari pukul 08:00-10:00 dan 2 jam pada sore hari dari pukul 16:00-18:00 dari umur 7 hingga 14 hari (R-1) dan umur 7 hingga 21 hari (R-2); ransum disediakan 4 jam pada pagi hari dari pukul 08:00-12:00 dan 4 jam pada sore hari dari pukul 16:00-20:00 dari umur 7 hingga 14 hari (R-3) dan umur 7 hingga 21 hari (R-4). Setiap perlakuan memiliki ulangan sebanyak 4 dengan jumlah ayam sebanyak 20 ekor/unit. Konsentrasi hormon tiroid dan plasma albumin pada R-2 dan R-4 lebih rendah (P<0,05) daripada R-0 selama pembatasan waktu makan dari umur 7 hingga 21 hari. Konsentrasi hormon tiroid dan metabolit darah tidak berbeda nyata diantara semua perlakuan selama periode pemulihan dari umur 21 hingga 42 hari. Disimpulkan bahwa konsentrasi hormon tiroid triiodotironin dan tiroksin (T 3 dan T 4 ) dan plasma metabolit darah (albumin) menurun selama pengaturan waktu makan 4 dan 8 jam/hari dari umur 7 hingga 21 hari, akan tetapi, kondisi demikian kembali normal selama periode pemulihan. Kata kunci: broiler, hormon tiroid, metabolit darah, pengaturan waktu makan ABSTRACTThe present study was conducted to determine the effect of feeding time restriction on thyroid hormone and blood metabolites concentration of broiler chickens during feed restriction and realimentation period. Four hundred of 7 days-old unsexed broiler chicken of Lohmann commercial strain were arranged in a completely randomized design with 5 treatments and analyzed based on ANOVA. The treatments were: chicks fed ad libitum as a control treatment (R-0); chicks had free access to feed during two periods of 2 h (08:00-10:00 and 16:00-18:00) from 7-14 d of age (R-1) and 7-21 d of age (R-2); chicks had free access to feed during two periods of 4 h (08:00-12:00 and 16:00-20:00) from 7-14 d of age (R-3) and 7-21 d of age (R-4). The treatments consisted of 4 replicates with 20 chicks each. During feeding time restriction from 7 to 21 d of age, thyroid hormone and albumin plasma concentration of R-2 and R-4 were lower (P<0.05) than R-0. There were no statistical differences among the treatments on thyroid hormone and blood metabolites during realimentation period from 21 to 42 d of age. It is concluded that thyroid hormone triiodothrionine and thyroxine (T 3 and T 4 ) and blood metabolite (albumin) decreased during feeding time restriction for 4 and 8 h per d from 7 to 21 d of age and it returns to normal during realimentation period.
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