Judul: Kemampuan Reproduksi Nyamuk Aedes aegypti Berdasarkan Keberadaan Nyamuk Jantan
Abstrak: The research was conducted to determine the reproductive capability of Aedes aegypti related to the presence of male mosquitoes, that include the number of eggs, eggs groups, egg hatchability and fertility between female Aedes aegypti that lived together with the male mosquitoes during her life and female mosquitoes that lived together with the male mosquitoes until it’s first gonotrophic cycle. Mosquitoes were obtained from the Parasitology and Medical Entomology Insectarium FKH IPB. This research consisted of two treatment groups. Every treatment was repeated three times and each repetition consist of 20 females and 10 males Aedes aegypti mosquitoes. The first treatment group consist of females that lived together with males during her life. The second treatment group consist of female mosquitoes that lived together with the male mosquitoes in the same cage until it’s first gonotrophic cycle. The number of eggs and eggs groups on both treatment did not show a significant difference. Egg hatchability also did not show a significant difference on both treatments. The female mosquitoes that lived together with the male mosquitoes just until the first gonotrophic cycle was capable to produce eggs in every gonotrophic cycle due to having a spermathecae.
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Judul: Pengaruh Waktu Simpan terhadap Daya Tetas Telur Aedes aegypti
Abstrak: The aim of this research was to determine the number of eggs and eggs hatching of Aedes aegypti. These mosquitoes obtained from the Parasitology and medical entomology insectarium FKH IPB. This research was consisted of five groups of treatment which each treatment involved 20 females and 10 males of Aedes aegypti. The eggs which produced in 1st gonotrophic cycle stored for the longest period of 180 days. Otherwise, the eggs produced in the last gonotrophic cycle has the shortest of stored period (0 day). The highest number of eggs produced on the 12th day (third gonotrophic cycle) with average of each mousquitoes are 88,4 eggs. The lowest number of eggs produced on the 60th day (14th gonotrophic cycle) are 17,92 eggs. The highest eggs hatching on the 9th gonotrophic cycle (7th day store periode) are 67,4%. The lowest eggs hatching on the first gonotrophic cycle (180th day store peride) are 0% or no eggs hatched. The number of eggs influenced by the age of mousquito. The number of eggs is diminish along with the female mosquitoes age increasing. Otherwise, the eggs hatcing of Aedes aegypti influenced by store period because the eggs hatching diminish along with the store period increasing.
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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