Judul: Sintesis superabsorben melalui kopolimerisasi pencangkokan dan penautan silang onggok dengan akrilamida
Abstrak: Solid wastes of tapioca is known as onggok. This study is aiming to see a possibility to increase the value of onggok by transforming it into a superabsorbent polymer through grafting cross-linking copolymerization of acrylamide as a monomer, N,N’-methylenebisacrylamide as a cross-linker, and ammonium persulfate as an initiator. Onggok was used as a backbone in grafting and cross-linking copolymerization. The copolymerization was conducted at 70oC for 3 hours and the copolymer was saponified with NaOH 1M for 2 hours. Water absorbency capacity of the saponified copolymer as well as unsaponified copolymer thereafter were measured. The saponified copolymer showed significant difference in absorbency capacity, i.e. 28.92 g/g and 1040.08 g/g, for unsaponified and saponified copolymer, repectively. This was obtained from copolymer composed of 25% onggok, 75% acrylamide, 25 mg N,N’-methylenebisacrylamide, and 250 mg ammonium persulfate. The occurrence of grafting cross-linking copolymer was confirmed by fourier transformed infrared spectra, where it was found to exhibit all characteristic bands of both polysaccharide fractions of onggok and acrylamides units.
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Judul: Sintesis Superabsorben melalui Kopolimerisasi Pencangkokan Akrilamida pada Onggok Dialdehida
Abstrak: Cassava waste pulp (onggok) from the tapioca industry is abundant in Indonesia. Cassava waste pulp still has relatively high carbohydrate content, mainly starch and glucose, which is potencial to be utilized as superabsorbent raw material. The goal of this work was to synthesize superabsorbent material from cassava waste pulp through oxidation followed by graft copolymerization. The oxidation was carried out with sodium periodate (NaIO4) to break the C2-C3 bond in the glucose ring. Various concentration of NaIO4 solution (0.01, 0.05, and 0.10 M), oxidation time (15 and 60 min), and washing solutions (distilled water, methanol, and acetone) were used to obtain the optimum aldehyde group amount (the optimum C2-C3 bond cleavage) and the best products resistance against microbes. Optimum oxidation were by conditions using 0.05 M NaIO4 in 1 hour and washed with acetone. Graft copolymerization process was performed by using acrylamide, methylene-bis-acrylamide, and ammonium persulfate. The copolymerization products were then saponified to increase the water absorption capacity. The test result showed that the superabsorbent could swell up to 400 times of their original weight in distilled water. However, the capacities were decreased in salt solution as well as in acid and basic solutions.
Keyword: acrylamide, copolymerization, onggok, oxidation, superabsorbent

Judul: Prevalence of Bird Lice on Rock Pigeon (Columba livia) in 99Wonderland Park, Selangor, Malaysia
Abstrak: Rock Pigeon (Columba livia) have coexisted with humans for thousands of years and are used for various purposes such as food and in sports. Rock pigeons may have the potential to be infested with a wide range of ectoparasites, which can have a significant impact on their life cycle. This study aims to measure the prevalence of Columba livia with bird lice in 99Wonderland Park, Selangor, Malaysia in the year 2020 and to ascertain the impact of bird lice on the health of these infested birds. Data were collected from clinical records for the month of January to December in the year 2020 from 99Wonderland Park, Selangor, Malaysia. Lice were identified in 42 of the 80 Rock pigeons examined so, the overall prevalence of lice infestations was 52.5%. The prevalence of ectoparasites was found to be higher in young Rock pigeons (60.4%) as compared to adult Rock pigeons (37.4%). Columbicola columbae (wing lice) and Colpocephalum turbinatum (body lice) are two species of lice that have been detected. Body lice were more prevalent in young Columba livia birds at 47.6% whereas wing lice were more prevalent in adult Columba livia birds at 16.7%. Most of the lice were found in the thorax and abdomen area followed by the head and neck area., Merpati Batu (Columba livia) telah hidup berdampingan dengan manusia selama ribuan tahun dan digunakan untuk berbagai keperluan seperti makanan dan olahraga. Merpati batu dapat terinfestasi dengan berbagai ektoparasit, yang dapat berdampak signifikan pada siklus hidup mereka. Penelitian ini bertujuan untuk mengetahui prevalensi Columba livia dengan kutu burung di 99 Wonderland Park, Selangor, Malaysia pada tahun 2020 dan untuk memastikan dampaknya terhadap kesehatan burung yang terinfestasi. Data dikumpulkan dari catatan klinis dari bulan Januari hingga Desember tahun 2020 dari 99Wonderland Park, Selangor, Malaysia. Kutu diidentifikasi pada 42 dari 80 merpati batu yang diperiksa sehingga, prevalensi keseluruhan infestasi kutu adalah 52,5%. Prevalensi ektoparasit ditemukan lebih tinggi pada merpati batu muda (60,4%) dibandingkan dengan merpati batu dewasa (37,4%). Columbicola columbae (kutu sayap) dan Colpocephalum turbinatum (kutu badan) adalah dua spesies kutu yang telah ditemukan. Kutu badan lebih banyak ditemukan pada burung Columba livia muda sebesar 47,6% sedangkan kutu sayap lebih banyak ditemukan pada burung Columba livia dewasa sebesar 16,7%. Sebagian besar kutu ditemukan di daerah dada dan abdomen diikuti daerah kepala dan leher.
Keyword: Columba livia, prevalence, ectoparasite, wing lice, body lice, Columba livia, prevalensi, ektoparasit, kutu sayap, kutu badan