Judul: Uji aglutinasi galur-galur bakteri bintil akar kedelai tumbuh lambat dan efektif
Abstrak: Penelitian aglutinasi yang ini bertujuan untuk mempelajari reaksi terbentuk di antara galur-galur bakteri bintil akar kedelai tumbuh lambat dan efektif. Darl reaksi yang terbentuk galur-galur tersebut dikelompokkan berdasar- kan kesamaan atau kekerabatan antigeniknya, mengingat sum- ber-sumber galur tersebut masih terletak pada lokasi yang berdekatan. Pengujian dilakukan dengan mereaksikan antigen dan antibodi di dalam cawan plastik bercekung yang diinkubasi- kan dalam penangas air bersuhu 52°C selama 2 jam, 4 jam dan dienapkan selama 24 jam di dalam refrigerator (lemari es bersuhu 4°C). Reaksi aglutinasi positif ditandai dengan terbentuknya gumpalan agregat besar sampai kecil berupa butiran-butiran halus dengan cairan jernih disekitarnya. Hasil reaksi aglutinasi dengan cawan plastik berce- kung, setelah dibiarkan di dalam penangas air bersuhu 52°C selama 2 jam dan 4 jam tidak berbeda hasilnya bila diamati langsung dengan mikroskop binokuler. Dengan demikian vari- asi perlakuan pemanasan di dalam penangas air bersuhu 52°C selama 2 jam dan 4 jam ternyata tidak mempengaruhi penam- pilan reaksi aglutinasi yang terbentuk, dengan perkataan...
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Judul: Kekerabatan serologik isolat bakteri bintil akar kedelai tumbuh lambat dan efektif asal lahan sawah
Abstrak: Pemanfaatan uji serologi, aglutinasi dan imunodifusi gel terhadap dua belas galur bakteri bintil akar kedelai menghasilkan 4 kelompok serologi atau serogrup 50, 42, 25, dan 23 Antiserum bersangkutan yang dipakai dikembangkan dari galur sebagai hasil imunisasi Somasegaran-Hoben dan Bankole-Bohlool. menurut prosedur Kedua belas galur 07, 18, 20, 23, 25, 26, 28, 30, 43, 47 dan 50 dengan nilai ES tinggi untuk kesepuluh lokasi lahan sawah, dipilih dari 50 galur yang telah diuji keefek- tivan simbiotiknya pada kedelai Wilis dan Merbabu dengan USDA 110 dan 122 sebagai galur acuan, sedangkan ke 50 galur tersebut berasal dari 242 isolat bakteri bintil akar tumbuh lambat hasil pancingan kedelai Wilis, Kerinci, Merbabu, Margatapa dan Davros yang ditanam pada 10 lokasi lahan sawah desa Brujulkulon, Majalengka. 42, Ciri morfologi, koloni, sifat Gram dan beberapa ciri biokimia dari ke 50 galur bakteri tumbuh lambat tersebut te- lah diamati dan menunjukkan kesamaan yang erat kecuali pada toleransi terhadap pH medium 4.5 dan 9.0. Namun, telaah ciri antigenik yang dilakukan terhadap 12 galur uji telah menun­jukkan keragaman yang tinggi.
Keyword: Soybeans, Serologic

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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