Judul: Kajian Daya Tahan Mahasiswa FMIPA IPB yang Berprestasi Rendah di TPB dengan Pendekatan Regresi Cox
Abstrak: Mahasiswa Tingkat Persiapan Bersama (TPB) yang memperoleh Indeks Prestasi (IP) rendah, yaitu antara 1.30 dan 2.00, sebagian gagal menyelesaikan studi. Oleh karena itu batas terkecil IP TPB 1.30 sebagai standar DO perlu dievaluasin kembali untuk mengetahui apakah batas tersebut sudah tepat digunakan. Penelitian ini dilakukan pada rnahasiswa FMIPA IPB angkatan '95, '96, dan '97 yang berprestasi rendah pada TPB. Pendekatan analisis yang digunakan adalah analisis daya tahan dengan model regresi Cox.
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Judul: Analisis IPK Rendah Mahasiswa TPB IPB Tahun Akademik 2009/2010
Abstrak: Keberhasilan studi mahasiswa baru di IPB dapat diamati melalui IPK pada TPB. Berdasarkan rangkuman data IPK populasi mahasiswa baru IPB Tahun Akademik 2009/2010 dengan beracuan pada kriteria pemeringkatan sekolah dalam Peringkat Riwayat Akademik Sekolah di IPB (PERAK SLTA-IPB), terdapat sekitar 11% (342 orang) mahasiswa TPB memiliki IPK kurang dari 2.10 atau tergolong memiliki IPK rendah, dengan persentase terendah ada pada jalur USMI dan tertinggi ada pada jalur BUD. Ada 2 kelompok mahasiswa dengan IPK rendah, yaitu mahasiswa DO (IPK ≤ 1.50) dan mahasiswa tidak DO ( 1.50 < IPK ≤ 2.10). Keberhasilan studi mahasiswa baru mungkin dipengaruhi oleh faktor lingkungan dan budaya serta faktor sosial ekonomi. Faktor lingkungan budaya diwakili oleh daerah asal SLTA, peringkat asal SLTA, jalur masuk IPB, prioritas pilihan masuk IPB, tingkat popularitas mayor, nilai Pengantar Matematika, Kalkulus, Kimia, Fisika, dan Biologi. Sedangkan faktor sosial ekonomi diwakili oleh jenis kelamin, penghasilan orang tua / wali, pekerjaan orang tua / wali. Dari model regresi logistik biner dengan peubah respon adalah mahasiswa TPB Tahun Akademik 2009/2010 dengan IPK rendah terungkap bahwa hanya faktor lingkungan dan budaya yang berpengaruh terhadap mahasiswa DO, yaitu prioritas pilihan masuk IPB, nilai Kalkulus, Kimia, dan Biologi. Nilai Kalkulus paling dominan mengakibatkan DO mahasiswa TPB dengan IPK rendah. Model regresi logistik biner yang dibangun pada penelitian ini memiliki tingkat ketepatan klasifikasi sebesar 91.5%.
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Judul: Systematics of Desmos (Annonaceae) in Malesia
Abstrak: Desmos is a woody climbing genus of Annonaceae which has been widely used as traditional medicine in several countries such as China, Indo-China, Thailand, and Peninsular Malaysia to treat dysentery, vertigo, fever, and postpartum. Phylogenetic studies on Desmos showed a close relationship between Desmos and Dasymaschalon. They share similar moniliform monocarpic fruits, but their flowers are different. It has been debated among Annonaceae researchers whether both genera should be treated as the same or distinct genus. Therefore, investigation on the taxonomic delimitation of Desmos species and Dasymaschalon will be necessary. Plastid genome (plastome) identification, leaf epidermal section of Desmos species and Dasymaschalon species, a taxonomic revision of Desmos in Malesia using morphological data, the spatial distribution of Desmos species in Malesia, and morphological and genetic variation in Desmos chinensis population using ISSR marker were used to investigate taxonomic delimitation of Desmos. Plastome study of Desmos chinensis and Dasymaschalon dasymaschalum was carried out to determine the origin, evolution, phylogenomics, and identify marker candidates for Desmos and Dasymaschalon or with other genera in Annonaceae. We discovered that the plastome of Desmos chinensis was circular with the size of 167,677 bp (smaller than Dasymaschalon dasymaschalum), consist of 111 genes, including 78 protein-coding genes, 29 transfer RNAs, and 4 ribosomal RNAs. The plastome showed a typical quadripartite structure, i.e., large single copy (LSC), small single copy (SSC), and two inverted repeats (IRs). The plastome of Dasymaschalon dasymaschalum was 191,488 bp in length, which also exhibited a typical quadripartite structure (LSC, SSC, and two IRs). Desmos chinensis and Dasymaschalon dasymaschalum showed different copies of accD, ndhD, ndhF, rps18, and ycf2. Protein coding genes of rpoB, rpoC1, rbcL, matK, rpl32, infA, and rpl36 were identified based on nucleotide diversity, sequence variability, and parsimony-informative sites. The genes are defined as molecular marker candidates of plastome for phylogenetic, barcoding, and population genetic research. We predicted that Desmos chinensis and Dasymaschalon dasymaschalum separated at ca. 64 million years ago during the Paleocene. Leaf anatomical feature study was carried to support the taxonomic delimitation of interspecific Desmos and intergeneric of Desmos and Dasymaschalon. Leaf anatomy in the paradermal section of 20 taxa (12 species of Desmos, eight species of Dasymaschalon) have been carried out. According to the leaf epidermal section, Desmos and Dasymaschalon are two distinct genera mainly distinguished based on the anticlinal wall undulation of epidermal cells and supported by variation of the crystal type and size. The anticlinal wall undulation of Desmos was almost straight to slightly wavy and never sinuous; meanwhile, Dasymaschalon varies from almost straight to deeply sinusoid. The crystals of Desmos consist of rhombohedral, druse type A, and druse type B crystals, whereas Dasymaschalon has prism, druse type A, druse type B, and druse type C crystals. The recent taxonomic revision using the morphological data was mainly based on the examination of about 1374 specimens from BO, L, WAN, ANDA, SING, SAN, K, P, HUH herbaria. The Desmos species in Malesia consists of eight species: D. acutus, D. chinensis, D. chryseus, D. dunalii, D. pedunculosus, D. subbiglandulosus, two new records: D. lawii and D. macrocarpus, and one
Keyword: Dasymaschalon, Desmoid clade, Magnoliid, plastid genome, phylogenomics analysis