Judul: Membran Komposit Selulosa Asetat-Polistirena Akibat Pengaruh SDS Dan Suhu
Abstrak: Nanopore membrane cellulose acetate-polystyrene with SDS as porogen, can be utilized as a filter in seawater desalination process. Nanopore membrane CA-PS was prepared under reverse phase method. The process was started with making polymeric mixed solution of cellulose acetate, polystyrene, and SDS in dichloromethane-acetone mixture (1:1), with composition of CA:PS:SDS were 9:1:0,5; 9:1:1; 9:1:1,5; 9:1:2; and 9:1: 2,5. The solution was stirred for ±16 hours and casted on the glass plate surface, and then submerged it into water of 40 oC and 60 oC. The average water flux in 40 oC temperature was 45,74−280,21 L/hour.m2 and in 60 oC temperature was 73,20−370,30 L/hour.m2. The average rejection index point membrane in 40 oC temperature was 23,41−37,39% and in 60 oC temperature was 30,77−37,93%. It showed that the membranes soaked in a warm water increased water flux and rejection index.
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Judul: Behaviour of Composite Membrane Nanopore Cellulosa Acetat-Polistirene (CA-PS) due to Surfactant and Temperature Effect.
Abstrak: Membrane can be used for separation because of its superiority such as simple, simplicity, low energy consumption, and environmentally sound product. The cellulose acetate membrane is an example of the environmentally sound product and is used widely, such as in waste water treatment installation. This is the follow-up of the previous research and focused at the modification of cellulose acetate membrane by polystyrene and cetiltrimetyl ammonium bromide (CTAB) as porogen. The experiment was started with production of cellulose acetate membrane with polystyrene and CTAB with compositions of CA:PS:CTAB of 9:1:0.5, 9:1:1, 9:1:1.5, and 9:1:2. The membranes were formed by molding the mixture into films followed by characterisation of water flux value, rejection index at pressure 20 psi, and analysis of the surface morphology of membrane by scanning electron microscope (SEM). The SEM photo showed that temperature and CTAB affected the amount and the size of pores, and membrane surface textures. Increasing water flux and decreasing rejection index were decreasing with the increasing amount of CTAB. The highest water flux value showed by membrane with CTAB 1.5 % (MCCT 3) membrane at 40 ºC temperature, that was 160.6054 (L/m2.jam). Whereas the highest rejection index was in MCCT 2 at 40 ºC temperature, 9.30 %. The SEM photo showed that MCCT 4 membrane soaked in 40 ºC had pore size of 0.25 μm (250 nm) whereas those soaked in 60 ºC temperature had pore size of 0.50 μm (500 nm). These the membranes were classified as nanofilter
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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