Judul: Perencanaan Lanskap Wisata Alam Danau Maninjau, Kecamatan Tanjung Raya, Kabupaten Agam, Sumatera Barat
Abstrak: Sumatera Barat merupakan provinsi yang memiliki keanekaragaman unit lanskap, dengan Danau Maninjau sebagai danau vulkanik yang menjadi salah satu ikon provinsi ini. Di sekeliling Danau Maninjau terdapat berbagai tujuan wisata dengan daya tariknya masing-masing, namun arah perkembangan zaman membawa Danau Maninjau ke kondisi memburuk, sehingga mengakibatkan tujuan-tujuan wisata tersebut tidak berkembang dan dikelola dengan baik. Dengan dilakukannya perencanaan lanskap wisata alam Kawasan Danau Maninjau, maka keberlangsungan Danau Maninjau dan lokasi-lokasi wisata alam yang terdapat disekelilingnya dapat terjaga dan memberikan manfaat bagi lingkungan sekitar dan masyarakat setempat terutama dalam hal ekonomi. Penelitian ini mempertimbangkan faktor ekologis, pengembangan rencana pemerintah daerah terhadap Kawasan Danau Maninjau, aspek legal dan usaha pengembangan kualitas visual. Metode yang digunakan pada penelitian ini mengacu kepada Gold (1980). Terdapat beberapa potensi yang mendukung kegiatan wisata alam di Kawasan Danau Maninjau, seperti keragaman hayati dan adat istiadat yang mampu menjaga lingkungan, dan obyek-obyek alam yang indah. Disisi lain, penurunan kualitas air danau dan dominasi pengembangan keramba jaring apung menjadi kendala dalam pengembangan wisata alam di kawasan ini. Zona yang direncanakan yaitu zona penerimaan (0.6 ha), zona transisi (38.1 ha), zona lindung kawasan (7356.25 ha), zona kegiatan wisata (5024 ha), zona penyangga (1045.65 ha), dan zona industri perikanan (166.4 ha).
Keyword: daya dukung, lingkungan, perencanaan, Maninjau, wisata

Judul: Economic assessment and management policy of lake resources sustainability (Case study in Maninjau Lake of West Sumatera)
Abstrak: Maninjau Lake that lays in the Tanjung Raya district, Agam Regency, West Sumatra Province, has potential in nature resources and environment that can be used for supporting the economic in this regency. The economic function i.e as water sources for irrigation, fisheries ( Catch and mariculture), Local or international tourism, domestic needs, and as an electrics generator that produce energy 205 MW annualy. The objectives of this research are : (1) Knowing total economics value of Maninjau Lake utility, (2) Knowing perception of society around the lake on Maninjau lake utility, (3) Formulating policy to preserve Nature resoure functions that be conected to Maninjau Lake utility. This research shown Total Economic Value of Maninjau Lake amount Rp 350,921,949,238, This value consist direct use value (DUV) Rp. 339,527,739,838,-, indirect use value (IUV) Rp 5,121,289,600,-, option value (OV) Rp 3,237,103,800 and non use value (NUV) Rp. 3,035,816,000,-. The result of Analysis public perception about the existence of the Maninjau lake varies greatly. This variation relate to the characteristics of the communities. Characteristics of the communities that have a significant relationship with the perception, namely: age, educational level, and type of the work. Bureau of Maninjau Lake Territory Management (BPKDM), Nagari Government and Central Government as the key variable that influenced another lower level institution in the hierarchy below. Sub elements that have high moving power to the successful management of natural resources and environment of Maninjau lake are understanding values about the lake to the public society, biodiversity maintenance, maintenance of hydrological and ecological functions, and maintaining Environmental Hygiene. Strong driving for the successful management program of Maninjau Lake are increasing knowledge and awarness public about the Lake, expanding alternative economic opportunity and increasing income of society around the Maninjau lake, increasing participation of society on the management of lake and making good management strategy for a fishery with society and empowerman organizational management of the lake. The ultimate obstacle are the low understanding about the values of the lake as the God creation that needs conservation sustainability, less coordinations among instantional on the management maninjau lake, The low active of public role in conserving the lake,yet of collective willingness on lake maintaining, unclear about responsibility of lake property, and not active monitoring of changes about lake water quality.
Keyword: Economic assessment, total economic value, management policy, Danau Maninjau, Sumatera Barat

Judul: Mathematical model of Hematopoietic Stem Cell in Chronic Myelogenous Leukemia with and without Therapy
Abstrak: Leukemia or blood cancer is a diverse group of neoplastic disease, characterized by the multiplication of abnormal leukocytes or malignant transformation of blood-forming cells in bone marrow and lymphoid tissues. One of the most common types of leukemia is Chronic Myelogenous Leukemia (CML), which is usually diagnosed by the presence of certain chromosomal abnormalities, the so-called Philadelphia chromosome (Ph). One of the treatments of CML is Granulocyte Colony-Stimulating Factor (G-CSF). In this paper, we discuss two Hematopoietic Stem Cell (HSC) models, i.e. HSC without treatment and HSC with G-CSF treatment. The model of HSC without treatment included three equations representing the dynamics of HSC, leukocyte and platelet. Whereas, the model of HSC with G-CSF treatment includes the previous three equations and adds two more equations representing G-CSF injection and G-CSF circulation. The stability behavior of the system approaching the equilibrium points in the simulation study is carried out using Mathematica 7.0. The simulation results show that the G-CSF treatment can successfully decrease the number of HSC, which means reducing the CML.
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