Judul: IPB (Bogor Agricultural University)
Abstrak: Impotensi atau gangguan ereksi (erectile dysfunction) dapat diartikan sebagai ketidakmampuan laki-laki mencapai dan mempertahankan ereksi yang cukup kaku untuk persetubuhan yang memuaskan. Kekakuan dan kelembekan penis sangat tergantung pada tingkat pengisian darah korpus kavernosum yang pada gilirannya tergantung pada kondisi relaksasi dan kontraksi otot polos trabekula jaringan korpus kavernosum. Relaksasi-kontraksi trabekula ini dipengaruhi oleh beberapa sistem neurotransmisi dan neuromediator antara lain, sistern adrenergik, endotelin dan prostaglandin untuk kontraksi serta sistem kolinergik dan nitrik oksida (NO) untuk relaksasi. Data tentang neurofarmakologi ereksi serta fisiologi korpus kavernosum sudah cukup tersedia. Namun tidak demikian halnya dengan arteria pudenda,pembuluh proksimal pernasok darah utama korpus kavernosum.
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Judul: IPB (Bogor Agricultural University)
Abstrak: Kualitas makanan yang dikonsumsi sangat penting artinya baik dalam proses metabolisme maupun dalam pembentukan sel jaringan. Nilai gizi makanan ditentukan oleh kelengkapan senyawa-senyawa yang dibutuhkan oleh tubuh dalam proses pertumbuhan, Dalam proses metabolisme dibutuhkan kecukupan dan kelengkapan senyawa-senyawa protein: lemak, karbohidrat, vitamin dan mineral. Kekurangan gizi menimhulkan pertumbuhan badan yang tidak normal. Kekurangan gizi tersebut dapat disebabkan oleh tingkat pendapatan yang rendah dan kekurang-tahuan tentang arti dan fungsi gizi.
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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