Judul: Diversitas dan sebaran kumbang staphylinid di habitat ubi jalar di bogor
Abstrak: Kumbang staphylinid (coleoptera) dicirikan dengan elytra pendek dan tubuh berwarna jingga, cokelat, atau hitam. Kumbang ini bersifat predator, fitofag, dan saprofag. Penelitian ini bertujuan mengeksplorasi keanekaragaman dan pola sebaran spesies staphylinid di habitat ubi jalar di sembilan lokasi di bogor. Penelitian ini juga mengamati tipe-tipe hemosit pada hemolimfa kumbang stenus sp. Kumbang staphylinid dikoleksi dari kebun ubi jalar dalam plot berukuran 1x1 m2 yang diletakkan secara sistematis. Setiap kebun ubi jalar dibuat 10 plot. Kumbang staphylinid yang ditemukan di kebun ubi jalar di bogor terdiri dari 6 spesies, yaitu stenus sp., hypostenus prahoeensis, paederus fuscipes, philonthus sp1, philonthus sp2, dan philonthus sp3. Spesies staphylinid yang dominan adalah stenus sp. Berdasarkan nilai indeks keanekaragaman (h’), staphylinid di kebun cipaku-2 tergolong memiliki keanekaragaman sedang (1<h’<3), sedangkan di lokasi lainnya memiliki keanekaragaman rendah (h’<1). Kebun ubi jalar cibereum-2, cipaku-1, dan cipaku-2 memiliki kemerataan (evenness) tinggi (e>0,6) dan kebun ubi lainnya memiliki kemerataan rendah (e<0,4). Indeks nilai penting (inp) tertinggi terdapat pada stenus sp. (162,50%), sedangkan inp terendah pada philonthus sp1, philonthus sp2, dan philonthus sp3. Kumbang stenus sp., p. Fuscipes, dan h. Prahoeensis mempunyai pola sebaran mengelompok (id>1). Indeks similaritas tertinggi (cs=1,0) terdapat pada kebun ubi jalar dramaga, bojongrangkas, sindangbarang, cibereum-1, cibinong, dan cimanggu. Indeks similaritas terendah (cs=0,14) ditemukan antara kebun ubi jalar di cipaku-1 dan cipaku-2. Tipe-tipe hemosit yang ditemukan pada hemolimfa kumbang stenus sp. Yaitu adipohemosit, prohemosit, granulosit, sistosit, spherulosit, dan oenositoid.
Keyword: diversitas, hemosit, sebaran, staphylinid, ubi jalar

Judul: Keanekaragaman dan Kelimpahan Spesies Staphylinid (Coleoptera) di Habitat Persawahan Sekitar Bogor
Abstrak: Staphylinid beetles (order Coleoptera) are characterized by elongated and slender body shape, short elytra that covered some segments of the abdomen, and body usually shiny black, brown, or yellow-brown. In the paddy field ecosystem, these beetles are known as predator. This research aimed to measure the diversity and abundance of staphylinid beetles in the paddy field at some areas in Bogor. The research also studied the hemolymph structure of Paederus fuscipes. Collections of beetle were done by using road sampling method in some paddy fields. Observations of hemolymph structure were done by making a blood smear. Staphylinid beetles found in six paddy fields in Bogor were Paederus fuscipes (subfamily Paederinae), Stenus sp. (subfamily Steninae), Hypostenus arachnoides (subfamily Steninae), and Astenus lombokianus (subfamily Paederinae). Diversity of staphylinid species in paddy fields is low. The most dominant species staphylinid at the paddy fields was P. fuscipes. Hemocytes type found in the hemolymph of P. fuscipes beetles were prohemocyte, plasmatocyte, adipohemocyte, and cystocyte.
Keyword: Bogor Agricultural University (IPB), staphylinid., paddy fields, hemocyte, diversity, Dominance

Judul: Sintesis dan Pencirian Natrium Titanat (Na2Ti2O4(OH)2) Berbahan Dasar Titanium Dioksida
Abstrak: TiO2 can be utilized as basic material for synthesis of sodium titanate (Na2Ti2O4(OH)2). This research was purposed to synthesize and characterize sodium titanate from TiO2 rutile powder as a basic material. Sodium titanate was synthesized by hydrothermal process at temperature 130 °C by mixing TiO2 rutile powder with 5 M and 10 M NaOH solution, then each was calcinated at temperature 700 °C. The energy dispersive X-ray analysis showed that sodium titanate has been successfully synthesized. This result was also supported by functional group analysis with Fourier transform infrared (FTIR) spectrofotometer showing the existence of Ti-O-Na vibration band at 989.42 cm-1. The formation of sodium titanate was depend on the reaction condition such as temperature, reaction time, and NaOH concentration. Scanning electron microscope image indicated that sodium titanate synthesized at 130 °C in 20 hours reaction time with 10 M NaOH had crystal size of 99.37 nm.
Keyword: