Judul: Keanekaragaman Serangga Penyerbuk pada Pertanaman  Mentimun Pengaruh Keberadaan Habitat Alami
Abstrak: Pollination is a critical first step in sexual reproduction of flowering plants. Insect pollinator plays an important role in pollination prosess of flowering plants, including cucumber. The aims of this study are to determine the influence of natural habitats toward the diversity insect pollinators and to gain informations of the relationship between insect pollinator diversity and the number of flowers. The research was set up in six locations with different distances from the natural habitat. Three locations are categorized as being in a close proximity to natural habitat (D), which is about ≤200 m and three other locations are categorized as far from natural habitats (J), with a distance of ≥1000 m.The distance between the locations are 1.5 km. Observations were conducted by two methods, sweeping net and malaise traps. Number of flowers were counted using the amount of flower activities which open and close at four points for each by 1 m x 1 m plot. Results showed that agricultural land conditions affect the abundance of insect pollinators. The highest diversity of insects were found in the morning, e.g.- at 09:00 am and 11:00 am. No correlation were found between the numbers of species of insect pollinators and the numbers of flower.
Keyword: pollination., natural habitat, insect pollinator, diversity

Judul: Pengaruh Kondisi Lahan Pertanian terhadap Kelimpahan Serangga Penyerbuk: Implikasi terhadap Produksi Mentimun
Abstrak: Insect pollinators play an important role in pollination on various plants, including cucumber. This research aims to study the influence of natural habitat toward the abundance of insect pollinator and its effect on cucumber production. This research was conducted at six locations with various distances to natural habitat. Three locations were categorized as locations near natural habitat, i.e. less than 200 m. The other three locations were categorized as locations far from natural habitats, i.e. 1000 m. The observations of insect pollinator abundance were conducted by counting the number of insect pollinator that perched on 100 units flower in four different spots. The observations were conducted at four different times. Several variables were observed, i.e. the weight of cucumber, amount of seeds, dried weight of seeds, length and width of cucumber, on four different subplots sized 1 m x 1 m. The results showed that the presence of natural and seminatural habitats surrounding agricultural land, influence the abundance of insect pollinators. Whereas time of the highest numbers of insects pollinating the flower were at 9 am, 11 am and 3 pm. There is no correlation between the numbers of individuals with cucumber production.
Keyword: natural habitat., insect pollinator, cucumber production, abundance

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.
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