Judul: Kajian Penggunaan Metode Respon Permukaan untuk Optimasi Pasca Panen (Studi Kasus Perlakuan Konsentrasi Pelilinan dan Suhu Penyimpanan Buah Manggis).
Abstrak: Inappropriate post-harvest handling of mangosteen is one of the reasons that caused low quality and consumer rejection. Several practices in post-harvest handling of fresh mangosteen to preserve its self life and quality includes but is not limited to packaging techniques, storage temperature control, storage in modified atmosphere, waxing, or any combinations of the above. Researches on the most preferred procedure of combining temperature control and waxing are still ongoing. From the literature it is found out that the latest research was looking for optimum combinations by comparing the treatment variations. By creating a mathematical model the responses to the treatment (as the variables) can be estimated, even the optimum values can be found. Response Surface Methodology (RSM) is used to look for the conditions of the treatment (Temperature and Waxing Concentration) which exerts the optimum influence to the parameters under observation. The storing stages started with the waxing, followed with packaging with plastic stretch film, and lastly storing in cold storage with various temperatures. Responses noted were rate of respiration, weight reduction, the firmness and total soluble solid (TSS) value. The experiment had been performed using Central Composite Design (CCD) with two factors (variables). Variables being optimized were storage temperature (X1) 6°C, 8°C, 13°C, 18°C, 20°C, and waxing concentration (X2) 4%, 5%, 7,5%, 10%, 11%. Further, the response to TSS optimization in 2nd order yielded the best value. The validity of the RSM method was proven by the regression test result R2 of 79%, lack of fit was obtained at 0.065. The optimum temperature is 130C, wax concentration is 8% with TSS rate is 2,1oBrix/day. The format of the plot surface resulted was a maximum. Mathematical model obtained was: Y = -6,574 + 0,429X1 + 1,515X2 - 0,0008X1X2 - 0,016X1 2 - 0,096X2 2
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Judul: Kajian Konsentrasi dan Metode Pelilinan Buah Manggis (Garciana mangostana L.) Semi-Cutting Selama Penyimpanan Dingin
Abstrak: Quality of mangosteen (Garcinia mangostana L.) fruit decreases due to the process of respiration and transpiration during storage after postharvest. Long term storage time causes peel hardening, semi-cutting might prevent this peel hardening from happening. However semi-cutting treatment would damage the fruit and it will quickly rot, and one of the solution to this problem is to do waxing. This study aimed to obtain a combination of concentration and most pelilinan method for semi-cuting the mangosteen fruit. This research result showed the concentration of 12% wax applied by using a brush sweeping was the best combination to assurance quality of semi-cutting mangosteen fruit during cold storage at 13°C until, day-45. Organoleptic test results showed a concentration of 12% with a combination of sweeping seemed tend to be accepted by panelists and the panellist preferred to do fruit mangosteen waxing method than other treatments until day-41.
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Judul: Psittacosis Sebagai Zoonosis Penting Yang Berasal Dari Burung
Abstrak: Psittacosis atau ornithosis adalah penyakit menular dari burung kepada manusia. Agens penyebab psittacosis termasuk ke dalam virus psittacosis-lymphogranuloma venereum group yang disebut Chlamydia psittaci. C. psittaci hanya dapat berkembang biak di dalam jaringan hidup tetapi peka terhadap antibiotik. Penyebaran penyakit ini sangat luas, terdapat hampir di seluruh dunia. Di Indonesia penyakit ini belum pernah di diagnosa, tetapi mengingat terdapat demikian banyaknya jenis burung maka diperkirakan psittacosis ini sudah ada. Kasus pada manusia pertamakali ditemukan oleh Ritter pada tahun 1879, di Eropa. Waktu itu dikenal sebagai pneumotyphus. Chlamydia psittaci tidak hanya sebagai penyebab infeksi pada burung, juga bisa menyebabkan infeksi pada mamalia diantaranya sapi, kerbau, kambing, domba, babi dan kucing. Pada kucing dikenal sebagai feline pneumonitis. Pada domba atau kambing mengakibatkan enzootic abortion. Pada burung, kalkun merupakan unggas paling rentan diikuti oleh burung psittacine dan burung lain di luar famili psittacidae. Virulensinyapun berbeda-beda. Yang berasal dari kalkun bervirulensi tinggi, sedangkan yang berasal dari burung merpati bisa bervirulensi tinggi bisa juga bervirulensi rendah. Penularan terjadi melalui kontak langsung maupun ti- dak langsung. Penularan melalui telur tidak terjadi. Umumnya penyakit ini memperlihatkan gejala klinis berupa deman, lesu, lemah, anorexia, kurus, diarrhea ber- warna kekuningan, discharge dari mata dan hidung, conjunc- tivitis. Gejala khas pada kalkun adalah istirahat dengan sternum sebagai dasarnya, karena adanya tekanan dari bagian perut yang sakit. Sedangkan pada manusia memperlihatkan adanya demam, kadang-kadang merasa dingin, lesu, sakit kepala yang hebat, sakit pada bagian belakang badan dan photophobia…dst
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