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 tapak dara (Catharanthus roseus) sebagai larvasida nyamuk culex quinquefasciatus
Abstrak: Mosquitoes are blood-sucking insects related to human disease because its role as a biological vectors. The control of mosquitoe’s that using a synthetic substance leads to resistance and toxic to human and animals. This research was conducted to measured the activity and effectivity of tapak dara (Catharanthus roseus) leaves extract to the mosquitoe’s larvae of Culex quinquefasciatus mortality. The research was conducted in February - August 2013. This research were carried out in two steps, i.e. the extraction of tapak dara leaves and the phytochemical test; and the effication test of the extract against the larvae of Culex quinquefasciatus. The result showed that the mortality of Cx. quinquefasciatus larvae with concentration 2000 ppm after 24 hours exposured was 47%. The increasing of leaves extract concentration and the duration of the exposured were followed by the increasing of the larvae mortality rate. The LC50 value of Cx. quinquefaciatus was 3469 ppm. Based on the LC50 value tapak dara leaves extract was not effective against the larvae of Culex quinquefasciatus.
Keyword: Catharanthus roseus, Culex quinquefasciatus, larvicide

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