Judul: Potensi Bakteri Asam Laktat Yang Diisolasi Dari Tempoyak Sebagai Probiotik
Abstrak: Penelitian ini bertujuan untuk mengetahui mikroflora tempoyak yang berasal dari berbagi daerah dengan umur yang berbeda-beda, serta menguji lebih lanjut sifat-sifat bakteri hasil isolasi untuk dikembangkan sebagai probiotik. Dari 5 lokasi sampel yang digunakan, bakteri asam laktat berhasil diisolasi dari 3 sampel tempoyak yang berasal dari Bandar Lampung, Kalianda, dan Kotabumi dengan umur tempoyak kurang dari 1 bulan (1, 2, 3 minggu). Selanjutnya diperoleh 42 isolat bakteri asam laktat berbentuk batang pendek yang termasuk dalam genus Lactobacillus. Setelah seleksi awal berdasarkan ketahanan terhadap asam lambung, asam empedu, dan sifat antimikroba terpilih 9 isolat untuk diidentifikasi lebih 1anjut dan diuji sifat-sifat probiotiknya. Sembilan isolat teridentifikasi sebagai Lactobacillus coryneformis (1 isolat) , Lactobacillus plantarum(5 isolat), dan Lactobacillus casei (3 isolat) dengan tingkat kekerabataan yang berbeda-beda.
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Judul: Bakteri Asam Laktat Asal Bekasam sebagai Kandidat Probiotik
Abstrak: Explotary studies of lactic acid bacteria (LAB) that have the potential as probiotic are continously conducted. One source of LAB which has potential as probiotic candidate is bekasam. The aims of this study were to select and evaluate LAB of bekasam origin as probiotic candidate. Three isolates of LAB of bekasam origin have isolated, selected, and evaluated their probiotic properties by in vitro method, then characterized, and identified with API 50 CHL. The result showed that all isolates well grown in gastric juice pH and small intestines pH with 0.5% bile salt (SR ≥50%). Three isolates showed antimicrobial activity to Enteropathogenic Escherichia coli, Staphylococcus aureus, and Salmonella typhimurium ATCC 14028. Characteristics of three LAB isolates candidate as probiotic were Gram-positive rod shaped, non motile, negative catalase, and homofermentative. The results of the identification found that SK(5) and NS(9) were Lactobacillus plantarum 1 with 99.9% and 99.5% similarities, while BP(10) was Lactobacillus pentosus with 99.9% similarities.
Keyword: probiotic candidate, lactic acid bacteria, in vitro, bekasam

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