Judul: Pola Pewarisan Karakter Suara Kicauan Pada Burung Perkutut
Abstrak: Turtledove (Geopelia striata) is a singing birds that has a better melodious voice. The inheritance of this character has not been determined, so that research on the voice inheritance is important. This study was aimed to characterize the voice patterns turtledove. Materials consisted of 12 pairs of parents and their progenies. Twelve of their turtledove was ranked based on their sound quality. The parameters observed included voice patterns, the presence of elements of sound, the type of sound, harmonious sound (frequency and level of sound intensity) and duration of the total sound. Voice analysis was done by using computer software Cool Edit Pro version 2.1. Sound visualization was displayed in waveform shape. Sound intensity level was determined using the formula TI = 10 log I/I0, with the value I0 at 10-12 W/m2. Based on the inheritance analysis sire voices is a better chance in herediting of the voice and the number of beats sound of the middle voice. Dam plays an role in giving voice rhythm modification and sound tip inheritance. Based on the sound analysis, sound quality the voice rank from the highest to the lowest were: ♂AK, ♂ FQ, ♂HHa, ♂ ISS, ♂HRR, ♂ BL, ♂CM, ♂ EQ, ♂GQ, ♂DO, ♂DN, and ♂DP. The frequency value and the highest intensity level displayed by AK turtledove were 929.49 Hz and 91.5 dB, whereas the lowest value displayed by ♂DP were 633.59 Hz, and 67.83 dB. The best rhythm of the turtledove indicated by high frequency with a stable pattern, harmonious the intonation, as well as clear basic voice.
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Judul: Karakteristik morfologi, suara dan genetik burung derkuku(Streptopelia chinensis), puter(Streptopelia risoria) dan silangannya
Abstrak: Penelitian ini bertujuan menelaah karakteristik morfologi kualitatif dan kuantitatif, termasuk suara dan kegenetikaan burung derkuku (Streptopelia chinensis), puter (Streptopelia risoria) dan silangannya. Hasilnya akan mendukung kesuksesan program persilangan kedua jenis burung ini. Digunakan burung dewasa sebanyak 46 ekor terdiri dari 17 ekor burung derkuku, 21 ekor burung puter dan delapan ekor silangan (F1). Karakteristik morfologi burung derkuku, puter, dan silangan (FI) antara lain sifat-sifat kualitatif dan kuantitatif melalui pengamatan ciri-ciri khusus dan pengukuran terhadap bagian tubuh burung-burung ini. Karakteristik suara diperoleh dengan perekaman menggunakan Digital Voice Recorder. Selanjutnya suara dianalisis dengan menggunakan program komputer Voice Editor 3 dan Cool Edit Pro untuk mendapatkan frekuensi, jumlah element syllable, durasi suara, durasi antara, tempo dan amplitudo suara. Untuk mengetahui karakteristik genetik, dilakukan dengan menelaah pola pita protein darah berdasarkan hasil analisis protein darah melalui teknik elektroforesis metode gel poliakrilamida model vertikal...
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Judul: Sintesis Nitril Satu-Wadah dari Asam Lemak Jenuh
Abstrak: Nitrile is an important intermediate for fine-chemicals industries. In particular, fatty nitriles can be used for the production of bio-based surfactants, lubricant oils, and other high-valued chemicals. The aim of this study was to develop an efficient synthesis method for direct conversion of saturated fatty acids into their nitrile analogues. This study was expected to enhance the economical value of crude palm oil and crude palm kernel oil. The synthesis was conducted in one-pot reaction by refluxing fatty acid and excess of acetonitrile in acidic condition. The optimum condition for this reaction was at 115 °C for 24 hours with yields of 50, 50, 70, and 75% for lauric acid (C-12), myristic acid (C-14), palmitic acid (C-16), and stearic acid (C-18), respectively. Purity of the fatty nitriles obtained through this method were confirmed by thin layer chromatography, Fourier transform infrared spectra, nuclear magnetic resonance spectra, and melting-points.
Keyword: one-pot synthesis, fatty nitrile, fatty acid