Municipal solid waste or MSW has potency to be decomposed by microorganisms and trasformed into compost. The waste contains 60%-75% of organic materials C, H, O, and N. The aim of this research was to develop a simulation model based on mathematical equations describing the phenomenon of the composting. The population of microorganisms , the rate of O2 consumption , the rate of CO2 production , the rate of H2O production, the rate of carbon nitrogen ratio or C/N, and temperature were the variables tested in this research. Validation was carried out by comparing datum of simulation model with datum of composting. Simulation model was declared valid if the values of each parameter were r2 > 0.75, the total value of Err was closed to zero, and the distribution of Err was independent to time. The sensitivity test was analyzed by comparing the value changes of variable tied with the value changes of free variable. Correction from the simulation model in predicting the microorganism population, CO2, O2, and temperature could be expressed respectively as y’ = 1.06(y-1.003), y’ = 1.07(y+ 0.07), y’ = 1.02(y+ 0.05), and y’ = 1.02(y - 1.05). The temperature, the C/N and the rate of O2 consumption were sensitive to the changes of microorganism population and the radius of the bioreactor.
This research aimed to study status of arbuscular mycrorrhizal fungus (AMF) in mangrove and coastal forest post-tsunami disaster, and to study the relationship of soil phosphorus content and number of AMF spores and AMF infection of mangrove and coastal forest post tsunami disaster. Research results show that there were variability in spore numbers in the field studied. The spore numbers in mangrove forest were found as 359, 235, 118 and 160 spores per 50 g of soil in Meulaboh, Banda Aceh, Pidie and Nias respectively. Meanwhile, in coastal forest were 587, 297, 265 and 158 spores per 50 g in Meulaboh, Banda Aceh, Pidie and Nias respectively. The root of Rhizophora sp. and Casuarina equisetifolia were colonized by AMF both in mangrove and coastal forest. Number of spores were negatively correlated to soil phosphorus content, however, there were tendency of positive correlation between root infection and soil phosphorus content.
Key words: coastal forest, mangrove forest, mycorrhiza
Bacteria are microbes which have an ability to live wherever there is a life. Some of the bacteria are saprophyte and some are parasitic. But most of the bacteria have not been identified or cultured; therefore the benefits are still unknown. Methanogenic bacteria are one of the saprophyte bacteria. These bacteria produces methane, a biogas as an alternative fuel in the future. Most of methanogenic bacteria are uncultured, however a few of them are found in the sewage of coconut water. The objectives of this research are to isolate, characterize and identify the methanogenic bacteria that lived in coconut water. The method of this research was fermentation, analysis characterization, and identification of methanogenic bacteria. First, methanogenic bacteria were isolated from coconut water by fermentation. The samples were from four places in Minahasa, which are Rasi (I), Koka (II), Amurang (III), and Lola (IV) and one place in Bogor (V). Secondly, the methane produced from fermentation was analysed by gas chromatography and the bacteria can be characterized by Bergey’s method. The next step is the identification which was conducted by isolating the DNA, amplifying the DNA by PCR, then sequencing the DNA with BioEdit Sequence Aligment. As the result, high and stable methane was produced in Rasi (I) and Amurang (III). The characteristic of the bacteria are red colony (M) and white colony (P). The shape of the colonies is circles, gram positive, basil shape, mesofile, positive of catalase and citrate, positive of sugar fermentation, gelatin, casein and starch hydrolysis also lived in Nutrient Broth with pH 5.7-6.8. The sequencing of isolate P resulting in nucleotide composition of G 31.25%, C 20.58%, A 27.11% and T 21.04% while isolate M are G 31.34%, C 20.31%, A 27.02% and T 21.32%. The identification of isolate M is equal with Clostridium tyrobutyricum (100 %) and isolate P is very close with Clostridium tyrobutyricum (99 %).
Fish is a perishable product, and thereby needs a special treatment to prolong its shelf life. Traditionally, drying is a common treatment for the purpose, especially by using sun drying. This paper is devoted to the study of histiophoridae fish drying using a truneated trapezoidally shaped green house effect solar dryer in order to maximize the use of solar energy. The drying system used different size of racks and tray following the dimension of the structure so as to minimize empty space. The dryer was equipped with 25 watt DC blowers to remove the moist air. From two experimental runs, the results show that the system can properly dry the histiophoridae fish to its desired moisture content, which ranged from 30.08% (wb) to 32.80% (wb). Utilization of the truneated trapezoidally shaped green house effect solar dryer was found to be effective in enhancing the absorbtion of solar irradiation not only by the heat absorber but also by the producs on speated the vertically arranged racks. Solar PV modules were used to power inlet exhaust fans as well as for temperature control. A PCM energy storage was also provided to provide heating during night time.
Inorganic farming practices could have negative impact on environmental degradation due to excessive usage of chemical fertilizers and pesticides. One of many efforts to re-establish land productivity and reduce environmental degradation is by way of practising organic farming. The objective of this study is to explore and develop organic farming micro enterprise system supported by micro finance institution and its implication on relevant policies. The methods used in this study include soft system methodology approach utilizing total system intervention (TSI) mechanism that covers the principles of complementarism, social awareness and emancipation, and commitment to human well-being in the context of poverty alleviation. The techniques being adopted include business feasibility, comparative performance index, strategic asumption surfacing test and analytical hierarchy process. Case study was conducted in Garut regency, West Java. The performance of organic farming activity in Garut regency is considered adequate while the most preferable micro finance institution supporting agricultural sector is the saving and loan unit from cooperative organization, but on the other hand the micro banking sector has not been attracted in general to extend credit financing to agricultural sector due mainly to risk factor. Eventually this study has been able to introduce a concept of empowering micro enterprise in organic farming involving credit guarantee institution, technical assistance and production of organic fertilizers and pesticides. In view of enhancing the financing of organic farming, the concept of credit for microenterprise in organic farming is introduced for further development and implementation. Furthermore the policy implication of this study is iniciatives for poverty reduction trust fund and coordinating institution for micro financing institutions and the relevant law governing micro credit and micro finance institutions.
In the framework of regional development, only few of villages which developed by transmigration program expands as Indonesian government expected. Some problems are remote location with poor access, unfertile soil, and lack of supported socioeconomic infrastructure to develop farm enterprises. This research aims to analyze a growth of countryside level, agriculture activity, a society participation and aspiration, and to compile an area development instruction. The result shows that Bukit Makmur countryside has the highest hierarchy. As far as village area from the service center, it has a lower growth of countryside level. Most of people in the village hope to participate in development of their region, especially in developing of prime commodity such as oil palm which is plant in second arable land through a partnership with some investors which is facilitated by the government. East Kutai local government policy in developing area stated that Kaliorang transmigration area as a part of development area of Sangsaka Agropolitan. Infrastructure especially in transportation is a main problem, because of in developing area as an agribusiness district needs a supporting infrastructure upgrading and development and transportation facilities.
In recent years, there has been an increasing an abuse of slaughtered death chicken for human consumption, so it is important to find a practice ways to identify it. Experiments were conducted to determine whether the quality of meat taken from slaughtered death chicken can be detected through quality attributes of meat (Warner-Bratzler (WB) shear value, CIE L* a* b* color, and histological changes. Thirty pieces of breast (M. pectoralis) and thigh (M. biceps femoris) meat were obtained from commercial slaughtering house. The samples were classified into three groups namely halal slaughtered chicken (AHS), slaughtered death chicken (AMS), and slaughtered stressed chicken (ALS) and all samples processed for microscopic observations, for WB value and color after 1, 5 and 9 h postmortem (PM). This study showed that percentage of degenerated and necrotic muscle fibres of breast and thigh meat of AMS and ALS were significantly higher (P<0.05) than AHS. The WB values of all samples were nearly similar (P>0.05). The L* value of breast and thigh meat of AMS and ALS were lower whereas a* value of breast and thigh meat of AMS were significantly (P<0.05) higher than those of AHS and ALS. The muscle fiber interstitial space had significant positive correlation with degenerated muscle fiber (P<0.001, r=0.52), necrotic muscle fiber (P<0.001, r=0.57) of breast meat, and also with degenerated muscle fiber (P<0.001, r=0.68) and necrotic muscle fiber (P<0.001, r=0.56) of thigh meat. The biologic parameters can be used to distinguish between the slaughtered death chicken and halal slaughtered chicken.
