Judul: Studi Karakteristik Biomulsa: Pengaruh Ukuran Partikel serta Konsentrasi Serbuk dan Selulosa Klobot Jagung
Abstrak: Mulsa yang memiliki sifat biodegradabe perlu dikembangkan untuk menggantikan mulsa plastik yang dapat menimbulkan masalah lingkungan. Biomulsa klobot jagung menjadi solusi bahkan dapat meningkatkan nilai klobot jagung itu sendiri. Penelitian ini bertujuan menganalisa pengaruh ukuran partikel, konsentrasi klobot, serta jenis klobot (serbuk klobot atau selulosa klobot) terhadap sifat mekanik biomulsa yaitu kuat tarik, perpanjangan putus, dan modulus elastisitas. Rancang percobaan menggunakan rancang acak lengkap dan dilanjutkan analisa ANOVA dua arah. Pengujian sifat mekanik dilakukan dengan pengujian tarik. Serbuk klobot 100 mesh memberikan hasil yang terbaik dengan pengecilan ukuran partikel akan berakibat menurunnya sifat mekanik mulsa yang dihasilkan. Penambahan konsentrasi serbuk klobot dan selulosa klobot akan menurunkan sifat mekanik biomulsa yang dihasilkan. Nilai kuat tarik dan perpanjangan putus biomulsa dengan selulosa klobot jagung lebih tinggi dibandingkan dengan biomulsa serbuk klobot, sementara itu nilai modulus lebih rendah, namun lebih sesuai dengan yang ingin dicapai., Mulch that has biodegradable properties needs to be developed to replace plastic mulch which can cause environmental problems. Corn husk biomulch is a solution that can even increase the value of corn husks itself. This study aims to analyze the effect of particle size, husk concentration, and type of Particles (husk powder or husk cellulose) on the mechanical properties of biomulch namely tensile strength, elongation at break, and modulus of elasticity. The experimental design used a completely randomized design and continued with two-way ANOVA analysis. Testing of mechanical properties is carried out by tensile testing. Husk powder at 100 mesh gives the best results with a furthure reduction in particle size will result a decrease in the mechanical properties of the mulch. The addition of the concentration of husk powder and cellulose will reduce the mechanical properties of the resulting biomulch. The value of tensile strength and elongation at break of biomulch with corn husk cellulose was higher than that of husk powder biomulch, meanwhile the value of the modulus of elasticity was lower, but more in line with what was wanted to be achieved.
Keyword: ANOVA, biomulch, cellulose, corn husk, mechanical properties

Judul: Pengaruh Variasi Komposisi LLDPE dan Klobot Jagung Terhadap Karakteristik Mekanik Dan Biodegradasi Mulsa Bioplastik
Abstrak: Mulsa Bioplastik ini merupakan campuran polimer Linear Low Density Polyethylene (LLDPE) dan klobot jagung ukuran 200 mesh dengan metode calandering, variasi 5%, 10%, dan 15% klobot jagung. Biomulsa plastik yang telah dicetak dengan calandering, dianalisis mikrostruktur, sifat mekanik (uji tarik) dan biodegradasi. Analisis proksimat menunjukkan klobot jagung memiliki kadar serat dan karbohidrat tinggi. Konsentrasi 5% klobot jagung memiliki sifat mekanik paling tinggi dengan kekuatan tarik arah persilangan 8.598 MPa dan arah mesin 20.75 MPa, strain at break arah silang 143.3% dan arah mesin 409%. Hasil uji biodegradasi memperlihatkan Aspergillus niger dapat tumbuh pada biomulsa plastik, tetapi Penicillium sp. terlihat tidak tumbuh pada biomulsa plastik. Proses biodegradasi tersebut menyebabkan adanya persen berat yang hilang pada biomulsa plastik.
Keyword: biodegradable, klobot jagung, mulsa bioplastik, sifat mekanik

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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