| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 11-22 |
| Abstraksi Narasi | : | A flavonoid compound has been isolated from the leafs of a parasite plant (Dendropthoe sp) of asam Keranji. According to the analysis of both the UV-Vis Spectroscopy and the Infrared Spectroscopy the compound is considered as a flavonol, a type of flavonoid, which has a structural formula of C5H10O6 with the name of 5,6,7-trihidroxyflavonol. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 97-101 |
| Abstraksi Narasi | : | The study carried out to measure the trachea cell size of Hibiscus tiliceus L. from two different habitats. The first group consisting of 5 plants were collected from Pasir Putih Beach and the second group with the same number of plant collected from Untung Suropati, representating inward and habitat. The means of trachea cell size from that two habitat showed no significant different under T-test. The mean of trachea cell size of Hibiscus tiliceus L. from Pasir Putih beach was 124.08 Mu-M, while the mean of those collected from Untung Suropati was 105.20 Mu-M. |
| Nama Pengarang | : | John Hendri, Yulianti, Purwadi, Nurul Utami, R.H. Rusli, Ida Budiarty, Lies Maria Hamzah, Rinaldi Bursan, Yuliana, Neti, Irawan, Bambang, Dewi Rumbaina Mustikawati, Rudy Situmeang, Noviany, Trisnowati Budi Ambarningrum, Agus Susanta |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 1-10 |
| Abstraksi Narasi | : | Many method might be used to identify cellulose nitrate as a yield of product. The methods used in this research are infrared spectrophotometer, SEM, and x-ray diffraction. Cellulose nitrate was the product of reaction run in the optimum condition of Onggok and nitric acid with sulfuric acid as a catalyst. The IR spectrum showed that the onggok is cellulose and the product of reaction is cellulose nitrat, accordance with band absorbtion of N02 at 1384, cm^-1, for N-O binding vibration and band absorbtion of C-O-C cyclic moved from 686,6 cm to 1008,7 cm. The analysis of SEM showed that the product contains several particles reacted incompletely which is supported by x-ray diffractogram showed that the product is not crystal, but amorf. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 27-31 |
| Abstraksi Narasi | : | Study about bamboos species in West Lampung District has been done. This study is to know the used of bamboos in the local community. There were 4 genera of bamboos have been found during this study namely Bambusa, Dendrocalamus, Gigantochloa and Schizostachyum. Seven species of Bambusa, Dendrocalamus, and Gigantochloa are being used for building material such as house, bridge etc. Three species of Schizostachyum are being used for handicraf raw material such as basket, hat, etc. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 44-47 |
| Abstraksi Narasi | : | The thermal stability of the amalgam restoration was studied. One commercial amalgam (Valiant^TM USA) was used to prepare specimens amalgam. The specimens were prepared according to ADA SP No.1 standard. Phase identification was done by using of x-ray diffraction technique, with the parameter of 30 kV, 20 mA and the scanning speed of 2,5 % minute and Co ka radiation. Thermal analysis was conducted by Differential Scanning Calorimetry (DSC) with the scanning speed of 10 minute and the temperature range from room temperature to 150 C. X-ray diffraction results indicated that the amalgam consists of Ag2Hg3, Cu6Sn5 and Ag3Sn phase and no free mercury was detected. DSC thermogram of amalgam Valiant indicated the existence of Ag2Hg3 phase with the transition temperature at 107,9 C. It is concluded that the thermal stability of amalgam restoration is high compare to mouth temperature. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 120-127 |
| Abstraksi Narasi | : | There have been observed effect of atonic on garlic (Allium sativum L.) in term of plants height, wet and dry weight of the plants, length and width of the stomata, and bulb-ascorbic acid content. The experiment was under completely randomized design (CDR) with three replications. The first factor was atonic concentration (400 ppm, 500 ppm, and 600 ppm). And the second was plant age (15 days, 25 days, and 35 days). Data and Regression analysis at the 5% significance level. The results indicated that atonic concentration at 500 ppm which treated on fifteen days old plants appeared to heve largest wet and dry weight. While atonic concentration at 500 ppm applied on twenty-five days old plants increased the height of days old plants. In other sides, Atonic concentration at 500 ppm applied on thirty-five days old plants increased length and width of stomata, and ascorbic acid composition in the bulb. It could be concluded that there were interactions between atonic concentration and the plant age. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 92-97 |
| Abstraksi Narasi | : | Papain is one of the proteolytic emzymes. In order to obtain the high activity and pure enzyme, the enzyme was purificated as fallows: isolation of the enzyme from other components, ammonium sulphate precipitation of the enzyme, dialisis, and sephadex G-75 column cromatography. The enzyme activity determination was based on the amount of amino acid and simple peptides formed. The protein content was determinated by Lowry mettod. The result showed that specific activity of the sephadex G-75 column chromatography purified enzyme was 6,165 Mu/mj, degree of enzyme purity 38,292 fold, the recovery of 13,30% optimum pH at 6,5, optimum temperature at 65 C and optimum incubation time at 50 minutes. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 15-20 |
| Abstraksi Narasi | : | The effect of varieties and planting system to amylose and rice organoleptic was conducted in Batanghari (Central Lampung) on November 1997. The rice were the second wet season yield in 1997. The treatments were 2 factor namely varieties (IR 64 and Ciliwung) and planting system (seed direct planting system/tabela and moving planting system). Parameters analyses were percentage of amylose content and rice organoleptic (taste, colour, and texture). The treatment were arranged in a randomized block design with 3 replications. Data analysis used least significant defferent (LSD) at 5% level. The result showed that IR 64 variety produced bigger than Ciliwung variety. Interaction between varieties and planting system did not significantly different to rice taste, so the combination of IR 64 variety and seed direct planting system produced texture that more likely than other combinations. IR 64 variety and seed direct planting system produced more white rice colour than other treatments. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 64-71 |
| Abstraksi Narasi | : | The influence of the alloy composition and mold tenperature on microstructure and hardness and the following solidification process were studied. Two composition of Cu-Al (Cu-1 wt%Al=alloy I and Cu-4.5 Wt% Al-alloy II) were produced by casting technique. The cast alloys subsequently poured into the mold with three different temperature condition ie : 200 C mold (P), air blown mold (U), and room temperature mold (C). X-ray diffraction analysis shows the existence of Al2CU and Cu phases. Macrostructure than those of alloys indicate a columnar and selular dendritic structure respectively. The U mold alloys (faster cooling rate) give finest microstructure than those of alloys from C and P mold (slower cooling rate). The hardness value of alloys II are higher than the hardness of alloy I. The higher the content of Aluminium (4.5%) the finer the microstructure produced and the highest the hardness values. |
| Nama Pengarang | : | - |
| Nama Majalah/Jurnal | : | Jurnal Penelitian Sains dan Teknologi |
| Volume / Nomor Edisi | : | - |
| Nomor Halaman | : | 55-59 |
| Abstraksi Narasi | : | Copper-Tin (Cu-Sn) alloy exists in amalgam alloy in the form of Epsilon (Cu3Sn) and Eta (Cu6Sn5) phases. The microstructure and hardness of these phases are important and these two parameters will determine the mechanical behaviour of the amalgam. The microstructure and hardness are influenced by the composition of the alloy and the cooling rate at the time of solidification. Three Copper-Tin alloys with the composition of Cu-61 wt % Sn are produced by casting technique, and then the alloys were subjected to three different cooling rate condition ie: cooling in the air (as cast), air blown and quenched in the water. X-ray diffraction and metallography analysis of three alloys indicated the existence of Epsilon (Cu3Sn), Eta (Cu6Sn5) and Beta Sn phases. The finest microstructure was produced by the air blown cooling rate technique. The hardness of these alloys were measured by using of Vickers Hardness Tester. The result shows that the hardness of water quenched alloy is higher than the hardness of as cast and air blown alloys which implies good hardness of the amalgam alloy. |
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