Judul: Embolisme dan Pertumbuhan Padi Gogo dan Padi Sawah Akibat Cekaman Kekeringan
Abstrak: Embolism is the formation of air bubbles in the xylem vessel of plants caused by drought. Embolism may cause severe plant tissue damage, even lead to plant death. This research aimed to analyze the influence of drought stress to embolism formation and the growth of upland and lowland rice. The experiment was arranged in a factorial randomized complete block design consist of two factors; the first factor was rice variety (Situ Bagendit and Ciherang) and the second factor was drought stress. The results showed that after ten days drought treatment there was a decline of the media and leaves water status. Two types of emboly were formed in the xylem vessel, i.e: circle and ellips emboly. There was no increase in the number and size of circle emboly, whereas the size of ellips emboly was significantly enlarge. The leaves Percentage of Unstained Veins (PUV) of the both rice varieties increased as an effect of drought stress treatments. The increase of emboly did not cause significant difference in all vegetative growth parameters observed, but it was significantly decreased the seed weight of 1000 seeds.
Keyword: upland rice, PUV, lowland rice, embolism, drought stress

Judul: Pengisian Gabah Beberapa Varietas Padi pada Periode Cekaman Kekeringan Berbeda dalam Sistem Sawah
Abstrak: Rice, the main crop in Indonesia, is facing many problems in its development which is an issue of drought. Effect of drought on rice causes puso and decreases productivity. The objective of this research is to study the response of several varieties of rice grain filling at four different periods of drought. This research was conducted at the University Farm IPB, Babakan, Sawah Baru, Dramaga, Bogor, on land under Polyethylene roof from October 2011 until June 2012. The treatment design Randomized Completely Block Design with Split plot design of two factors. The first factor is period of drought treatments as main plots consist of four standards: dried at 3 weeks after tranplanting (MST) (K3); dried at 6 MST (K6); dried at 9 MST (K9) and control (K0) (without drying). Varieties as a subplot consist of eight standards are: IR-64, Ciherang, IPB 3S, Way Apo Buru, Jatiluhur, Menthik Wangi, Silugonggo and Rokan. Periods of drought affected grain weight and grain number of plant. Varieties affected number of husk of plant. 1000 grain weight was affected by periods of drought stress, varieties and interaction of both.
Keyword: 

Judul: Sintesis 1-Kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai Prekursor Asam (S)-(+)-(6-Metoksi-2-naftil)propanoat
Abstrak: Senyawa 1-kloro-2-metoksi-6-propilnaftalena-1,3-dioksolana (1:1) sebagai prekursor asam (S)-(+)-(6-metoksi-2-naftil)propanoat disintesis dari bahan awal 2-metoksinaftalena. Tahapan sintesis diawali dengan klorinasi menggunakan 2 jenis pereaksi klorinasi, yakni isosianurat terklorinasi dan NaOCl. Klorinasi dengan isosianurat terklorinasi berhasil menyintesis 1-kloro-2-metoksinaftalena sebagai produk monoklorinasi melalui pencirian dengan kromatograf gas-spektrometer massa (GC-MS). Nisbah konversi produk paling efisien diperoleh pada laju penambahan 2.5 mmol/jam. Sebaliknya, klorinasi dengan NaOCl menghasilkan produk triklorinasi. 1-Kloro-2-metoksinaftalena selanjutnya diasilasi dengan propanoil klorida, tetapi analisis dengan GC menunjukkan bahwa produk asilasi tidak terbentuk. Sistem bebas-air diperlukan untuk keberhasilan proses asilasi tersebut.
Keyword: isosianurat terklorinasi, NaOCl, nisbah konversi