Kegagalan Pembentukan Polong Dan Bui Pada Bauhinia Tomentosa L. (Fabaceae)

H. IMAMUDDIN. 1987.The failure of pods and seeds development of Bauhinia tomentosa L. Suppl. Berita Biologi 3 : 35 - 37.Microscopic,observation to study the failure of pods and seeds development of Bauhinia tomentosa L. was conducted.Several buds,6 - 21 mm long, were diserved with paraffin method.The results showed that the failure of pods and seeds development of B. tomentosa were not caused by either flower morphology, pollen fertility or nticrospore development,but by abnormal development of saccus embrionalis,followed by incomplete development of egg cell,which made the flowers aborted before receptive

POLA PERTUMBUHAN DAN TOKSISITAS BAKTERI RESISTEN HgCl2 Ochrobactrum sp. S79 dari CIKOTOK, BANTEN

Penelitian ini dilakukan dengan tujuan untuk mengetahui konsentrasi HgCl2 dan pH optimum terhadap pertumbuhan isolat terpilih.. Isolat resisten diperoleh dengan cara mengisolasi tanah PETI dari Cikotok dan uji kualitatif dengan metoda disk blank. Toksisitas isolat resisten dilakukan dengan cara menumbuhkan isolat tersebut dalam media yang mengandung HgCl2 dengan konsentrasi dari 10-90 ppm. Dari isolasi isolat resisten HgCl2 dari 27 lokasi diperoleh 19 isolat resisten yang dominan, setelah itu dilakukan pengujian daya hambat hanya diperoleh 17 isolat yang tahan HgCl2 berkisar dari konsentrasi 5 – 90 ppm. Identifikasi bakteri dilakukan dengan 16S rDNA. Pengujian toksisitas isolat Ochrobactrum sp. S79 hanya sampai konsentrasi HgCl2 70 ppm dan pengaruh pH terhadap pertumbuhan Ochrobactrum sp. S79 ternyata pada pH <5 menghambat pertumbuhan isolat pada konsentrasi 10 ppm HgCl2

Profil Perubahan Amonium, Nitrit Dan Nitrat Pada Percobaan Curah Dari Pdam Bogor Dan Surabaya

Nitrification is often not effective because the characters of nitrifying bacteria is always slow growing and temperature, pH, DO, amonia concentration, nitrite and C/N ratio as the limited factors. Batch experiment was operated for 6 hours, every half an hours ammonium, nitrite and nitrate were measured.The results showed that added C sourse (glucose) in medium from PDAM Bogorand Surabaya have a significant effects of ammonium degradation, nitrite and nitrate production. Degradation of ammonium in batch reactor from PDAM Bogor showed that both naerobic and aerobic condition have a different fluctuation. Production of nitrite was stable from the middle of reaction to last of aerobic phase. In aerobic condition nitrate production is reduced to 49,21 % (+ glucose) and 60,87% (+ acetate) Batch reactor from PDAM Surabaya differ from PDAM Bogor particularly on degradation of ammonium. Added glucose as C source cause the concentration of ammonium was increased and acetate as C source showed stable with a slightly fluctuation. Nitrite and nitrate production relatively small in both C source

Evaluasi Kapasitas Tampungan Setu Tarisi Kabupaten Majalengka

Setu Tarisi terletak di Desa Babajurang Kecamatan Jati Tujuh Kabupaten Majalengka, saat ini dengan menggunakan tadah hujan, kondisi fisik setu sudah memprihatinkan dan dalam kondisi rusak berat, terdapat retakan pada puncak bendungan baik secara vertikal maupun horisontal, akibat tidak adanya bangunan penahan seperti pasangan batu pada dinding lereng, banyak tumpukan sampah/puing serta endapan sedimentasi pada kedua bangunan pelimpah terletak pada bagian struktur, lantai saluran dan tembok sayap bangunan serta pintu intake yang beberapa item nya rusak atau hilang. Setu Tarisi yang dibangun pada tahun 1928, dapat menampung 270.534 m3 dari yang seharusnya 320.000 m3 air hujan ditahun 2015 dengan tingkat sedimentasi sebesar 0,51 cm/tahun atau volume sedimentasi sebesar 49.466 m3 untuk mengairi sawah sebesar 49 ha pada intensitas curah hujanuntuk 100 tahun

Pertumbuhan Bakteri Hasil Isolasi Dari Tanah Perkebunan Yang Tumbuh Pada Media Mengandung Pestisida Propoksur Dan Karbaril

Growth Capacity of Soil Bacteria Isolates Obtained from Estate Area from Media Containing Propoxur and Carbaryl. Isolation actions have been carried out with three soil samples derived from soil estate of pine apple, sugar cane, and banana in Lampung area, Southern Sumatra. The isolates were grown in the selected media containing carbaryl insecticide, and herbicide of diuron and bromocyl. The highest and vigorous growth isolates have gathered from threedifferent soil samples, and subsequently named GGPC, GM, and NTF isolates. Furthermore, those isolates were studied through the growth rate in the media containing propoxur and carbaryl in the nutrient rich liquid (NB) and compared to limited mineral (MM). All of the isolates grew faster against pesticides in the liquid medium of NB compared to MM. High correlated value among parameters nurtured as due to bacterial population and those processes were not affected by media composition. The GM isolate showed similar pattern during propoxur decrease along with incubation even though the rate of pesticide elimination from the media was higher in the rich nutrient liquid media (NB) compared to MM