Judul: Preferensi Masyarakat terhadap Lanskap Visual Pemukiman (Studi Kasus Pemukiman di Kabupaten Cianjur dan Kotamadya Bogor)
Abstrak: Persepsi masyarakat terhadap lanskap pemukiman baik di perkotaan maupun di perdesaan yang masih kuat dipengaruhi oleh unsur tradisional sangat beragam Ole1h karena itu penelitian tentang persepsi dan preferensi masyarakat terhadap lanskap visual pemukiman perlu dilakukan. Tujuan penelitian ini adalah. mempelajarr preferensi masyarakat terhadap lanskap visual pemukiman perdesaan dan pemukiman perkotaan serta mencari unsur yang mempengaruhi persepsi dan preferensi masyarakat terhadap lanskap visual pemukiman.
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Judul: Hubungan persepsi masyarakat dan pemamfaatan taman lingkungan : Studi kasus Bukit Cimanggu Villa - Bogor
Abstrak: Tujuan penelitian ini untuk mengetahui keterkaitan antara persepsi masyarakat terhadap kondisi fisik dengan pemanfaatan taman lingkungan. Pemanfaatan yang dimaksud adalah berdasarkan ketersediaan fasilitas yang terdapat taman lingkungan. Selain itu, akan diketahui juga kaitan antara latar belakang responden yang meliputi jenis kelamin, umur, tingkat pendidikan, waktu luang dan status perkawinan dengan persepsi masyarakat terhadap kondisi fisik dan segi pemanfaatan taman lingkungan. Data yang diambil meliputi data primer dan data sekunder. Data primer dikumpulkan dari pembagian kuesioner, kepada potensial users sebanyak 50 orang. Metode yang dipakai dalam menyebar kuesioner adalah convenience sampling/purposive sampling secara non random sampling. Data primer yang didapat, kemudian saling ditabulasi-silangkan (cross tabulation). Untuk data mengenai latar belakang responden dianalisis secara deskriptif dengan menggunakan ukuran frekuensi/persentase. Guna mengetahui kaitan antara latar belakang responden dengan persepsi masyarakat terhadap kondisi fisik dan pemanfaatan taman lingkungan, dipakai cara tabulasi silang selain menggunakan uji kehomogenan khi-kuadrat Pearson sebagai bahan penguat. Data sekunder yang diambil meliputi denah lokasi, topografi, tanah, iklim, vegetasi, satwa serta kondisi umum taman lingkungan dan data lain yang menunjang proses penelitian. Data sekunder ini diperoleh dari Bagian Teknik PT. Perdana Gapura Prima selaku pengelola pemukiman Bukit Cimanggu Villa, Badan Meteorologi dan Geofisika Stasiun Dramaga Bogor, selain melalui pengamatan yang dilakukan di lapang. Sebagian besar responden terdiri dari wanita (70%), dengan kisaran usia dewasa (76%), sudah menikah dan mempunyai anak usia sekolah/Balita (40%) ..dst
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Judul: Extracellular Expression of thermostable Geobacillus stearothermophilus T1.2RQ Lipase for Biodiesel Production
Abstrak: The extracellular expression of enzymes in an excellent secretion host such as Bacillus subtilis is a useful strategy for making enzymes of industrial significance more affordable by lowering the cost of its downstream processing. Lipases are a category of hydrolases that catalyze the hydrolysis of triglycerides to glycerol and free fatty acids. Also, lipases catalyze the hydrolysis and transesterification of other esters as well as the synthesis of esters. They can perform very specific biotransformation reactions and are widely used in food, organic synthesis, detergents, cosmetic, and pharmaceutical industries. Geobacillus stearothermophilus T1.2RQ lipase is an industrially-desired thermostable lipolytic enzyme with an excellent hydrolytic and transesterification activity. This study aimed to express T1.2RQ lipase, in B. subtilis WB800 and ensure its secretion into the extracellular medium. Three signal peptides (AmyQ, Epr, LipA) and two promoters (Pgrac01 and Pgrac100) were used in the secretory-expression of T1.2RQ lipase, based on five constructed expression vectors constructed by restriction cloning and PCR mutagenesis. Sangers sequencing was used to verify constructs to ensure they are in the correct reading frame. Recombinants vectors, pHT43 (plasmid control), pHT43-T1.2RQ, pHT43- T1.2RQ_AmyQ, pHT43-T1.2RQ_Epr, and pHT43-T1.2RQ_LipA, were transformed by electroporation into Bacillus subtilis WB800. The electroporation was successful with the optimum condition of 2500V, 200 ohms, 25µF, and 5milliseconds. Recombinant B. subtilis pHT43 (negative control) and pHT43-T1.2RQlip + signal peptides were streaked on the lipidic agar, LA+TBN. All four recombinants, including the negative control (B. subtilis WB800-pHT43), produced clear zones on the TBN agar plate after overnight incubation (fig 2), indicating the presence of a lipolytic enzyme in all of the recombinant B. subtilis cells. pHT43-T1.2RQlip + signal peptides (AmyQ, Epr, and LipA) have clear zones with significantly higher diameters than B. subtilis WB800-pHT43 (negative control). This phenomenon suggests that the recombinant thermostable lipase T1.2RQ introduced into these cells was successfully expressed, thereby increasing the lipolytic capability of its host cells T1.2RQ lipase was expressed in 50ml terrific broth medium (TB) and the expression induced with 1mM IPTG. Lipase activity assay using p-nitrophenyl esters showed that all three signal peptides directed the secretion of T1.2RQ lipase into the extracellular medium. Signal peptide, LipA, resulted in the highest extracellular activity of 5.6 U/mL, which corresponds to a 6-fold increase over the parent B. subtilis WB800 strain. Meanwhile, signal peptides, AmyQ and Epr produced 4.2 U/mL and 3.4 U/mL activity respectively. SDS-Zymogram analysis confirmed that T1.2RQ lipase was correctly processed and secreted in its original size of 44 kDa. An attempt to further increase lipase expression level by promoter optimization showed that, contrary to expectation, promoter Pgrac100 exhibited similar expression levels as the original Pgrac01. Nevertheless, the demonstration of the successful secretion of T1.2RQ lipase in this work confirms the latter as a promising approach for the industrial production of the enzyme
Keyword: Bacillus subtilis, Expression, Extracellular, Heterologous, Lipase, Thermostable