Judul: Karakteristik Tanah Diatas Formasi Batugamping Koral (Coral Limestone) Di Wilayah Desa Pelauw, Pulau Haruku Kabupaten Maluku Tengah
Abstrak: Penelitian karakteristik taoah diatas formasi batugamping koral telah dilakukan di Desa Pelauw, Pulau Haruku, Kabupaten Maluku Tengah. Tanah-tanah di desa Pelauw belum pemah diidentifikasi hingga saat ini. Walaupun dibawahnya adalah batugamping koral, namun tanah diatas batuan induk bisa jadi betvariasi. Pemanfaatan sumberdaya taoah akan sangat efektif jika tanah tersebut telah diidentifikasi dan dicirikan lebih dulu. Tujuan penelitian ini adalah melakukan karakterisasi tanah di desa Pelauw dan mengklasifikasikannya menurut Sistem Taksonomi Tanah USDA, tahun 1998.
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Judul: Diversity of Soil Characteristics along a Land Transect in Two Geological Formations in the Padalarang Region, West Bandung
Abstrak: Suatu transek lahan dapat memiliki keragaman karakteristik tanah karena memiliki beberapa perbedaan dalam faktor pembentuk tanah, tergantung pada komponen yang dominan dalam mempengaruhi proses pembentukkan tanah. Area penelitian yang berlokasi di Desa Padalarang merupakan daerah yang unik dengan kondisi geologi dan relief atau bentuk wilayah yang terbentuk dari perbukitan vulkanik, perbukitan struktural tersier karstik, dan dataran rendah alluvial. Penelitian ini bertujuan untuk menguraikan keragaman karakteristik tanah pada suatu transek lahan yang berada pada perbatasan dua formasi geologi, yaitu formasi geologi tersier batugamping (Tomr) dan formasi kuarter vulkanik tua (Qob) di wilayah Padalarang, Kabupaten Bandung Barat. Pengambilan sampel dan analisis lapang dilakukan di empat titik yang berbeda secara toposekuen di dalam suatu jalur transek yang dipilih berdasarkan peta kontur dan pengamatan lapang. Profil tanah PT-1 mewakili lereng koluvial dari tebing karstik batu kapur dengan kemiringan lereng 55%. Profil PT-2 mewakili lereng alluvial-koluvial dengan kemiringan lereng 28%. Profil PT-3 mewakili lereng alluvial dengan lereng 3%. Profil PT-4 mewakili lereng bawah perbukitan dengan kemiringan 15%. Hasil penelitian mendapatkan bahwa transek lahan di lokasi penelitian mempunyai variasi bahan induk, geomorfik lahan dengan tingkat kemiringan, posisi dan proses transportasi material bahan yang berpengaruh terhadap karakteristik tanah, klasifikasi dan tingkat perkembangan tanah. Bahan induk tanah batugamping berpengaruh terhadap sifat kimia tanah yang berkaitan dengan proses pelarutan batu kapur, dan pengaruhnya terlihat pada kandungan Ca-dd dan pH tanah yang tinggi. Interaksi berbagai faktor pembentuk tanah menyebabkan perbedaan karakteristik tanah dan tercermin dalam klasifikasi tanahnya, dimana profil tanah PT-1 pada lereng koluvial dengan kemiringan sangat curam terbentuk tanah Lithic Eutrudept berdebu halus, campuran, super aktif, hiperthermik, PT-2 pada lereng alluvial-koluvial di bawahnya terbentuk tanah Inceptic Hapludalfs berlempung halus, campuran, super aktif, hiperthermik, PT-3 pada lembah alluvial terbentuk tanah Typic Endoaquepts berdebu halus, campuran, super aktif, hiperthermik, dan PT-4 pada kaki lereng terbentuk tanah Aquic Eutrudepts halus, campuran, super aktif, hiperthermik. Tingkat perkembangan tanah berdasarkan parameter diferensiasi horizon genetik, ketebalan horizon B, perbandingan debu/klei dan rasio KTK/persen klei pada horizon B, terlihat hampir sejalan dimana PT-2 > PT-4 > PT-3 > PT-1. Perkembangan tanah pada profil PT-1 terhambat karena faktor erosi akibat berada pada lereng koluvial yang sangat curam, sebaliknya profil PT-3 dan PT-4 yang berada di lembah atau kaki lereng terhabat oleh faktor drainase tanah., A land transect can have a variety of soil characteristics because it has several differences in soil forming factors, depending on the dominant component in influencing the soil formation process. The study area, which located in Padalarang, is a unique area with geological conditions and relief that were formed from volcanic hills, karstic tertiary structural hills, and alluvial lowlands. This study aims to describe the diversity of soil characteristics on a land transect located on the border of two geological formations, namely a limestone tertiary formation (Tomr) and an old quaternary volcanic formation (Qob), in Padalarang, West Bandung Regency. Sampling and field analysis were carried out at four different toposequence sites on a transect line selected based on the contour map and field observation. Soil profile of PT-1 represents the colluvial slope of a karstic limestone cliff with a slope of 55%. PT-2 represents the
Keyword: Land transect, Limestone and Old Volcanic Formation, Soil Classification and Development

Judul: Simulation of Modified Minimal Model for Glucose and Insulin Mechanism in Type 2 Diabetes and Healthy Humans
Abstrak: Bergman minimal model is Mathematics model which is invented by Richard N. Bergman in 1979. That model consists of three compartments to predict glucose effectiveness (SG) and insulin sensitivity (SI) from the intravenous glucose tolerance test (IVGTT) data in a period of time. A lot of modifications from bergman minimal model have been made with the purpose to increase the accuracy and to handle process complexity in glucose-insulin mechanism system. Minimal model can be used in health to diagnose, to prevent, and to treat diabetes patients. In this research, mathematics model is modified based on the assumption that insulin enters the plasma insulin compartment at a rate proportional to the product of time and the glucose concentration above a basal plasma glucose concentration. If the plasma glucose concentration drops below the basal plasma glucose concentration, so insulin rate which enters the plasma glucose compartment is zero. Insulin is cleaned from the plasma insulin compartment at a rate proportional to the amount of insulin in the plasma insulin compartment. This model is also modified based on the assumption that the insulin decay rate is not always a first order process and function identification from insulin infusion rate. Modified minimal model that is obtained in this research consists of three ordinary diferensial equations. The first and second diferensial equations state that the influence of insulin to speed up glucose absorption, whereas the third diferensial equation states that the influence of glucose to increase insulin secretion. The accuracy of modified minimal model working is tested by comparing the simulation result of modified minimal model with the simulation result by Zheng and Zhao and the experiment result from the previous study which is done by Jiaxu et al. The simulation from that ordinary diferensial equation is accomplished using ode45. In general, modified minimal model is applied to healthy humans and type 2 diabetes patients which is then divided into four conditions based on the amount of exogenous insulin infusion that is applied in MATLAB (Matrix Laboratory). On the first condition, model simulation in healthy humans without giving insulin infusion. That simulation result shows that after giving glucose injection to the body, glucose reaches higher concentration and returns to basal condition within one hour. When giving glucose injection, the signal is sent to pancreas, β cells in islands of langerhans reacts by producing insulin hormone. This condition is signed with the increase of insulin concentration in the body. After that, insulin concentration decreases and forms little peak. Insulin hormone functions to process glucose so that it can be absorbed by body cells. Within one hour insulin concentration will return to basal level because there is no glucose that should be processed anymore. It presents that pancreas responsiveness is excellent, in which β cells are able to secrete enough insulin to keep blood glucose concentration in normal condition. On the second condition, that is model simulation in healthy humans by giving exogenous insulin infusion on the 20th minute for 5 minutes as much as 30 mU kg-1 body weight. Glucose concentration of healthy humans will return quickly to
Keyword: modified minimal model, glucose,, insulin, type 2 diabetes