Judul: Kitosan Tertaut Silang Urea-Formaldehida dan Asam Sulfat Sebagai Penjerap Cibacron Red
Abstrak: Modified chitosan cross-linked with urea-formaldehyde and sulfuric acid has been prepare through an establishment of cross-linker material of urea, formaldehyde, and sulfuric acid with the ratio 1:2:1. The ratio of chitosan:crosslinker material used were, 2:1, 1:1, and 1:2. This modification was done to increase the capacity and efficiency cibacron red adsorption. Increasing the addition of N levels, was in line with the addition of cross-linker agent. Based on the Fourier transform infrared spectroscopy, there was an absorption peak of C-OS group with wavenumber 896.33 cm-1, which shows the cross-link bonds between HOSO-3 and metilolurea, and at 1120-1130 cm-1 that indicates the ionic bonds between the chitosan side chains, +NH3-OSO3 -2. Best adsorption conditions for cibacron red was obtained for 120 minutes and 0.1 g adsorbent to adsorbent ratio of 1:1. Capacity modified chitosan and adsorption efficiency of the cibacron red have better value than unmodified chitosan. The adsoprtion isotherm model of chitosan cross-linked urea-formaldehyde and sulfuric acid toward cibacron red followed the Langmuir isotherm equation.
Keyword: 

Judul: Adsorpsi Cibacron Red Menggunakan Campuran Kaolin Ampas Tebu dan Bentonit-Ampas Tebu
Abstrak: The use of agroindustrial waste and clay mineral have been studied as alternative adsorbents for dyes, such as Cibacron Red. Cibacron Red is one of reactive dyes which is widely used in textile industries In this research, the mixture of sugarcane bagasse and kaolinite or bentonite were used as adsorbents for cibacron red. Acid and base treatments were carried out to activate the adsorbents. Adsorption was carried out by varying adsorption times and adsorbent weights. The result showed that acid activated bagasse had the highest adsorption capacity. The optimum adsorption time and adsorbent weight were 120 minutes and 1 g with decrease of concentration from 50 mg/L to 7.99 mg/L. On the other hand, the optimum conditions for commercially activated carbon were 90 minutes and 1 g with decrease of concentration from 50 mg/L to 16.18 mg/L. The adsorption capacity and efficiency for acid activated bagasse was better than the commercially activated carbon. The adsorption capacity for acid activated bagasse and activated carbon were 2.10 mg/g and 1.69 mg/g adsorbent. The adsorption efficiency were 84.00% and 67.64%. Acid activated bagasse were followed Freundlich and Langmuir isotherm type, it was mean that adsorbent type is fisisorption and chemisorption.
Keyword: 

Judul: Angka kematian pra lahir domba ekor gemuk sesuai dengan umur jumlah dan posisi ovulasi dari induk
Abstrak: Tujuan penelitian ini adalah mengetahui angka ovulasi dan angka kematian pra lahir sesuai dengan umur, jumlah ovulasi dan posisi ovulasi dari induk. Mengingat ke dua faktor tersebut merupakan penentu utama pada penampilan reproduksi domba. Domba ekor gemuk bun- ting sebanyak 263 ekor milik rakyat, dipakai sebagai contoh, yang diperoleh dari 17 buah rumah potong hewan di daerah Malang. Penelitian dikerjakan dengan mengadakan pengamatan langsung pada alat kelamin, menghitung jumlah korpus luteum dan jumlah embrio atau fetus yang hidup pada waktu induk disembelih. Diasumsikan, bahwa domba ekor gemuk yang memiliki ovulasi ganda, fertilisasinya mempunyai phenomena all or none. Angka ovulasi domba ekor gemuk ternyata tinggi, yait 2.36 dan masing-masing induk jumlah ovulasinya berkisar dari satu sampai dengan lima. Karena itulah domos ekor gemuk dapat digolongkan prolifik, ovulasi ganda sebesar 87.45 persen. Khusus bagi kelompok induk bunting kembar dua, angka ovulasinya sebesar 2.44. dst ...
Keyword: Prenatal mortality