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.
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Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa