Judul: IPB (Bogor Agricultural University)
Abstrak: Aterosklerosis merupakan penyebab kematian utama di negara industri maju (Titus,1985). Di Indonesia, penyakit ini juga merupakan penyebab kematian tertinggi diantara penyakit-penyakit yang tidak menular (Laporan Dep.Kes. 1972, Laporan Dep.Kes. 1986). Hipotesa mengenai penyebab dari terjadinya aterosklerosis adalah: 1). Teori cedera, dapat terjadi oleh berbagai macam sebab. 2 ). Infiltrasi lemak kedalam intima khususnya kolesterol. Yang terakhir adalah 3). "Unified theoryw atau teori gabungan yang menyatakan lemak sendiri setelah mengalami oksidasi (antara lain oleh radikal bebas atau oksidan lain) menjadi sangat sitotoksik sehingga dapat mencederai endotel pembuluh darah arteri sekaligus mempermudah terjadinya infiltrasi lemak ke dalam intima.
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Judul: IPB (Bogor Agricultural University)
Abstrak: Kondisi stres menyebabkan jumlah radikal bebas berlebih dan dapat menimbulkan kerusakan sel. Tubuh secara normal mempunyai mekanisme pertahanan terhadap radikal bebas yaitu antioksidan. Antioksidan berfungsi untuk menetralkan radikal bebas. Superoksida dismutase (SOD) adalah salah satu enzin antioksidan intrasel yang melindungi sel dari serangan radikal bebas. Salah satu antioksidan ekstrasel yang dapat melindungi sel dari serangan radikal bebas adalah a[alfa]-tokoferol.
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Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell