Judul: Pembuatan dan Pencirian Plastik Biodegradabel Tepung Singkong-Umbi Porang
Abstrak: Cassava and porang tubers are polymeric material from agricultural biomass in the form of polysaccharide that can be used as raw material in the manufacture of biodegradable plastics. Plastic was made of cassava flour and combined with porang flour with glycerol and sorbitol as plasticizer. The plastics were prepared from cassava flour:porang:plasticizer with compositions 95:0:5, 70:25:5, 65:25:10, and 60:25:15. The analyses were on density, tensile strength, water vapor permeability, morphological, thermal, and functional groups. Glucomannans on porang flour increased the density and tensile strength of the biodegradable plastic produced. Water vapor permeability decreased with the addition of porang in the composition. The morphological observation showed that there was insufficient homogeneity properties. Sorbitol as plasticizer produced plastic with higher elongation than glycerol. Functional group analysis showed physical interaction.
Keyword: biodegradable plastic, cassava, porang.

Judul: Pembuatan dan Pencirian Bioplastik Polipaduan Pati Tapioka- Umbi Porang Terplastisasi Gliserol dengan Penambahan Natrium Alginat
Abstrak: Bioplastik polipaduan pati tapioka-umbi porang berpotensi menjadi alternatif pengganti plastik sintetik non-biodegradabel karena, didukung oleh ketersediaan bahan baku yang melimpah, dan mampu menghasilkan plastik biodegradabel yang cukup baik. Plastik dibuat dengan meragamkan komposisi pati tapioka-umbi porang 0:10, 2:8, 4:6, 6:4, 8:2, 10:0 dengan natrium alginat 25% (b/b), dan gliserol 5% (b/b). Plastik yang dihasilkan di analisis ketebalan, bobot jenis, sifat mekanik, sifat termal, morfologi, gugus fungsi, dan permeabilitas uap air. Tambahan umbi porang dalam komposisi meningkatkan ketebalan, bobot jenis, permeabilitas uap air, dan menurunkan nilai kuat tarik, serta persen elongasi. Analisis sifat termal plastik menunjukkan penurunan bobot yang hilang seiring dengan bertambahnya kadar umbi porang. Analisis gugus fungsi menunnjukkan plastik terbentuk melalui interaksi secara fisika. Permukaan film masih belum cukup homogen, terlihat dari gumpalan jarum halus pada permukaan.
Keyword: alginat, gliserol, pati, plastik, porang

Judul: Pengukuran Jantung Kelinci New Zealand White (Oryctolagus cuniculus) dengan Radiografi Toraks
Abstrak: This research was conducted to evaluate radiographs heart size of anaesthetized New Zealand White rabbits (Oryctolagus cuniculus) under different combination of ketamine and xylazine. The rabbits were divided into three groups. Group A were anaesthetized using a 35 mg/kg and 5 mg/kg combination of ketamine and xylazine (n=5). Group B were anaesthetized using a 40 mg/kg and 5 mg/kg combination of ketamine and xylazine (n=3) while group C were anaesthetized using 45 mg/kg and 5 mg/kg combination of ketamine and xylazine (n=3). Parameter of observation from left laterolateral view were: 1) the apicobasilar length of the heart (AB), 2) the width of the heart (CD), 3) the distance between the cranial edge of the fifth rib and the caudal edge of the seventh rib perpendicular to the spine (R5-7), and 4) the vertical depth of the toraks (H). Parameter of observation from dorsoventral view were: 1) the length of the heart (L), 2) the width of the heart (W), and 3) the width of the thorax (T). The result from the heart parameters observation that were measured in left laterolateral view and dorsoventral view shows theres no significantly differ among the groups (P > 0.05). The vertebrae heart size (VHS) values obtained from the sum of the length of the long and the short axes on left laterolateral view. The long axes mean values (A) were 4.35±0.26 v and the short axes mean values (B) were 3.59±0.30 v, therefore VHS mean values were 7.94±0.49 v. On the dorsoventral view, the length of the heart mean values (L) were 4.32±0.29 cm, the width of the heart mean values (W) were 3.33±0.26 cm, and the width of the thorax mean values (T) were 5.85±0.30 cm. In normal conditions, the width of the heart should be less than two-thirds the width of the thorax and values obtained of 3.33<3.72 it shows that the heart is in the normal range. The best ratio to calculated the normal heart dimension in the left laterolateral view was compared the long axes with the vertical depth of the thorax, whereas in dorsoventral view, the length of the heart was compared with the width of the heart.
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