Judul: Analysis of the Effect of  Formulation Variables on the Physicochemical Properties of Biopolymer  Microspheres
Abstrak: Penelitian ini bertujuan menganalisis pengaruh variasi variabel formulasi terhadap sifat fisikokimia mikrosfer berbahan dasar biopolimer. Metode yang digunakan adalah meta-analisis dengan pendekatan regresi linear sederhana. Variabel formulasi mikrosfer seperti kecepatan emulsifikasi, rasio obat-polimer, dan konsentrasi penaut silang berperan sebagai variabel bebas. Sifat fisikokimia mikrosfer seperti ukuran partikel, efisiensi enkapsulasi (%EE), dan laju pelepasan obat (%Drugrelease) berperan sebagai variabel terikat. Penarikan kesimpulan dilakukan berdasarkan nilai p-value, koefisien determinasi (R2), dan gradien. Morfologi mikrosfer diamati menggunakan citra hasil uji SEM. Interaksi obat polimer juga dianalisis melalui hasil uji DSC untuk analisis termal dan uji FTIR untuk analisis gugus fungsi., This study aims to analyze the effect of various formulation variables on the physicochemical properties of biopolymer microspheres. The method used is meta-analysis with a simple linear regression approach. The microsphere formulation variables such as stirring speed, drug-polymer ratio, and crosslinker concentration act as independent variables. The physicochemical properties of microspheres such as particle size, encapsulation efficiency (%EE), and drug release rate (%Drugrelease) act as dependent variables. Conclusions are drawn based on the p-value, the coefficient of determination (R2), and the gradient. The morphology of the microspheres was observed using SEM results. Drug-polymer interactions were also analyzed by DSC for thermal analysis and FTIR for functional group analysis.
Keyword: biopolymer, meta-analysis,, microspheres, physicochemical properties

Judul: Optimation of Tween 80 Concentration in Preparation of Polyblend of Microsphere (Polylactic acid and Polycaprolactone).
Abstrak: Microsphere is spherical micron-sized particles, made of ceramic materials, glass, or polymer as gas, solvents, or solid confining agent in form of organic or inorganic compound. Microsphere can be prepared using emulsification method. Microsphere based materials used were polyblend of polylactic acid and polycaprolactone, which were dissolved in volatile solvent then emulsified and dispersed in an immiscible solvent to form microparticles. Tween 80 was used as emulsifier in polyblend microsphere preparation. Polar hydroxy groups of tween would bind with water molecules while its long chain would bind with dichloromethane molecules to form more stable emulsion. Concentration of tween 80 added affected the emulsion stability that influenced uniformity and increased the number of microsphere produced. The greater concentration of tween 80 used the number of sized 125-212 μm and 75-125 μm microsphere were increasing, while the member of greater of >212 μm microsphere were decreasing. The addition of tween 80 as emulsifier in microsphere preparation do not affect microsphere degradation mechanism.
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Judul: Populasi Dan Habitat Lutung Jawa (Trachypithecus Auratus) Di Cagar Alam Dungus Iwul Kabupaten Bogor
Abstrak: Cagar Alam Dungus Iwul (CADI) dengan luasan ± 9 ha merupakan salah satu habitat alami Lutung Jawa (Trachypithecus auratus). Menurut Daftar Merah IUCN status konservasi lutung jawa adalah vulnerable dan termasuk dalam daftar Appendix II CITES. Keberadaan lutung jawa di CADI sudah ada sejak tahun 1931. Hasil penelitian yang dilakukan ditemukan dua kelompok lutung jawa yaitu kelompok 1 terdiri atas 24 individu dan kelompok 2 terdiri atas 2 individu. Sex ratio individu dewasa pada kelompok 1 (1:2.67) dan pada kelompok 2 (1:1). Aktivitas harian yang paling sering dilakukan adalah makan 41%. Wilayah jelajah seluas ± 6 ha dengan jumlah sebanyak 26 individu lutung jawa.Proporsi pakan lutung jawa didominansi oleh daun sebesar 76%. Tumbuhan iwul (Orania sylvicola) merupakan tumbuhan yang paling dominan. Pohon tidur lutung jawa paling banyak menggunakan pohon pohon kihujan(Engelhardtia spicata Lesh.), asem keranji (Dialum indum L) dan kibangkong (Endiandra rubescens). Aktivitas istirahat, makan dan aktivitas sosial lutung jawa banyak dilakukan pada strata A dan B, dan aktivitas berpindah banyak dilakukan pada strata C.
Keyword: habitat, lutung jawa, populasi