Judul: The Influence Of Immersion Four Species Of Leaves To The Development Of Culex Quinquefasciatus Larvae
Abstrak: Mosquitoes are insects which are harmful to humans as vectors of various diseases. The purpose of this research was to study the effect of aquatic media containing plant leaves against the emergence and development of Culex quinquefasciatus mosquito larvae. Four species of leaves (kaffir lime, fragrant pandan, betel, vinca rosea) were used in this research. Several pieces of fresh leaves (10 g) or the dried ones were added into a pail filled with 2 litres of clean water or contaminated water containing faeces of goats. The pails were opened for 24 hours and closed by plastic screen afterward. Treatments were repeated three times. The numbers of emerging larvae in the water were counted and their development was followed until become adult mosquitos. In the media with contaminated water, the immersion of various leaves showed lower average in the emergence of larvae than in the media containing clean water. In average, the lowest emergence (<10 individual) was found in water contaminated media containing the fresh kaffir lime, fresh betel, dried fragrant pandan leaves and in clean water media containing fresh betel, dried kaffir lime leaves. Most of the larvae and pupae failed to become imago. Whereas larvae and pupae that managed to be imago required a longer time in its development.
Keyword: bioactive compound, breeding place, food stock, larvae

Judul: Efektivitas Ekstrak Daun Sambang Colok (Aerva sanguinolenta) sebagai Larvasida Nyamuk Aedes aegypti dan Culex quinquefasciatu
Abstrak: Control of mosquito vectors need to be considered because it's role as vector of various diseases. Control efforts to reduce mosquito population more using synthetic insecticides at this time. The controling has become difficult because of resistance to synthetic insecticides. This research was aim to determine the effectiveness of sambang colok (Aerva sanguinolenta) leaf extract as mosquito larvicide against third instar larvae of Aedes aegypti and Culex quinquefasciatus. The study was conducted from April to July 2011 and performed in two stages. First stage was the extraction and phytochemical test and second stage was effication test of those extract againts larvae. The result showed that both of 91.7% Ae. aegypti larvae and 96.7% Cx. quinquefasciatus died at 1000 ppm after 24 hours exposure. Mortality of larvae increased with increasing the extract concentration and duration of exposure. The value of LC50 respectively from Ae. aegypti and Cx. quinquefasciatus were 494.47 ppm and 243.33 ppm. Sambang colok leaf extract was potential as a mosquito larvicide.
Keyword: 

Judul: Kerusakan bantalan rel kereta api di wilaya inspeksi 2 jalan dan bangunan perusahaan jawatan kereta api (pjka),cirebon
Abstrak: Kereta api merupakan salah satu sarana angkutan yang murah, cepat dan aman serta dapat mengangkut barang dalam jumlah besar. Kelancaran operasi sarana angkutan tersebut banyak ditentukan oleh kondisi jalan rel, termasuk kondisi bantalannya. Dalam hal ini bantalan rel kereta api dapat dibuat dari kayu, logam, atau beton. Namun demikian kayu merupakan bahan yang paling banyak digunakan sebagai pembuat bantalan rel kereta api di berbagai negara. Kenyataan menunjukkan bahwa kayu yang digunakan sebagai bantalan rel kereta api sering mengalami berbagai macam kerusakan yang menyebabkan bantalan tidak berfungsi lagi atau menurun fungsinya. Di Indonesia, informasi mengenai jenis dan tingkat kerusakan bantalan kayu masih sangat kurang, pada- hal informasi tersebut sangat penting sebagai dasar pertimbangan dalam rangka pemeliharaan jalan kereta api, agar umur pakainya (service life) lebih lama.
Keyword: bantalan rel