Browsing by Issue Date, starting with "2016-05-26"

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Enzyme Catalysis that Paves the Way for S-Sulfhydration via Sulfur Atom Transfer
(2016-05-26)
Huang, Gou-Tao
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Yu, Jen-Shiang K.
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生物科技學系
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生物資訊及系統生物研究所
;
Department of Biological Science and Technology
S-sulfhydration is generally anticipated to proceed through the transfer of the SH group (Nu-SH center dot center dot center dot S--R -> Nu(-)center dot center dot center dot HS-S-R). The other route involves the sulfur atom (5) transfer between two sulfhydryl anions (Nu-S-center dot center dot center dot S--R -> Nu(-)center dot center dot center dot S--S-R) and is considered electrostatically unfavorable. Mercaptopyruvate sulfurtransferase (MST, PDB code: 4JGT) catalyzes sulfur transfer from mercaptopyruvate to sulfur acceptors, and the first step of the reaction is the formation of cysteine (Cys248) persulfide via S-sulfhydration. Mechanistic studies on S-sulfhydration in MST using QM/MM methods show that the sulfur atom transfer initialized by the deprotonation of the Ser250/His74/Asp63 triad is kinetically preferred to the SH-promoted sulfur transfer. The calculated barrier of approximately 16 kcal mol(-1) for the S-0 transfer agrees well with experimental results. The electrostatic repulsion during the S-0 transfer can be sophisticatedly reduced by the aid of the Cys248-Gly249-Ser250-Gly251-Val252-Thr253 (CGSGVT) loop. Electrostatic potentials and frontier orbitals are also analyzed for the persulfide anion surrounded by the loop. The sulfur atom transfer which is seldom regarded possible is therefore facilitated with the assistance of the triad and the loop in the enzyme.
Short wavelength enhanced phototransistor with n-doped porous silicon layer
(2016-05-26)
Wang, Yao-Chin
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Lin, Bor-Shyh
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Yang, Zu-Po
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光電學院
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College of Photonics
A phototransistor with aluminium (Al)/porous silicon (Si)/epitaxial-Si structures was proposed and was fabricated and characterised with short wavelength enhanced operating. We proposed the short wavelength response of the Si-based thin film phototransistor; it can be enhanced by introducing thin porous Si (PS) layer as the base region of transistor. The porous process of device manufacture is suitable for applications in design of visible-light sensitive phototransistors. Experimental results showed that the short wavelength responses in the developed devices were enhanced as compared with the Si-based homojunction transistors, this comparably medium optical gain indicated that the developed Al/PSi/epitaxial-Si heterojunction thin film phototransistor got potential for practical Si-based optical-electron integrated-circuit and biophotonics applications.
A theoretical and experimental evaluation of surface roughness variation in trigate metal oxide semiconductor field effect transistors
(2016-05-28)
Hsieh, E. R.
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Chung, Steve S.
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
A gate current variation measurement method is proposed to examine the surface roughness of metal oxide semiconductor field effect transistors (MOSFETs). This gate current variation is demonstrated on the trigate structure MOSFETs. It was found that the standard deviation of oxide-thickness is proportional to the inverse of square-root of device areas, and its slope is defined as the effective surface roughness variation. In particular, for the transistors with varying fin height, this surface roughness effect aggravates with the increasing fin height. More importantly, the gate leakage at off-state, i.e., Vg = 0V, is strongly dependent on the gate dielectric surface roughness and dominates the drain current variations. This gate leakage may serve as a quality measure of a low power and energy efficient integrated circuit, especially for the transistor with 3-dimensional gate structure. The present results provide us better understandings on an additional source of V-th fluctuations, i.e., the surface roughness variation, in addition to the random dopant fluctuation, that we are usually not noticed. In particular, this study also provides us a simple easy-to-use method for the monitoring of oxide quality in the volume production of trigate MOSFETs. Published by AIP Publishing.
臺灣電影　從低谷中爬起
(2016-05-29)
許凱智
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Department of Communication and Technology
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傳播與科技學系
臺灣電影發展多年，過程中遇到許多問題，而臺灣的電影人，是如何準備和面對這些難關？
日本動畫　虛擬中的現實　
(2016-05-29)
梅瑞庭
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Department of Communication and Technology
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傳播與科技學系
以廣播為日本動畫的內涵與影響稍做分析。
一日活力的來源　竹東市場
(2016-05-29)
張家瑋
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Department of Communication and Technology
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傳播與科技學系
一日之計在於晨，民以食為天；早上的市場，滿足人們的胃。
輕小說　不輕鬆
(2016-05-29)
陳緯僑
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Department of Communication and Technology
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傳播與科技學系
一本捧在手上的輕小說，背後其實有許多人的默默付出。
伯特利　看見都市原民困境
(2016-05-29)
林湘芸
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Department of Communication and Technology
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傳播與科技學系
由Malayumu創立的原住民兒童托育機構—伯特利，秉持原住民互助精神實行全人照顧，卻不被法規認同。
食農教育推手　沺源青
(2016-05-29)
許雅筑
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Department of Communication and Technology
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傳播與科技學系
沺源青工作室以實際行動，享受土地與人之間最自然的關係。
隱形殺手　個資安全知多少
(2016-05-29)
楊淑斐
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Department of Communication and Technology
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傳播與科技學系
在大數據的時代，個人資訊就是金錢，你今天保護好你的個資了嗎？
流行樂的新趨勢與主流迷思
(2016-05-29)
吳和謙
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Department of Communication and Technology
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傳播與科技學系
近年來，受到數位化與網路串流科技的影響，流行音樂產業的收益與趨勢受到巨大的威脅與轉變。
總編輯的話
(2016-05-29)
王聖安
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Department of Communication and Technology
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傳播與科技學系
本期為喀報第兩百四十三期，共有二十篇稿件，其中廣播八篇、電視專題六篇、動畫兩篇、照片兩篇以及文字兩篇。
台灣首場　人外獸人ONLY
(2016-05-29)
王鈞鋒
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Department of Communication and Technology
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傳播與科技學系
簡單介紹CU聯盟，以及從二○一五年開始的人外獸人ONLY緣起，以及參加者的感想、問題。
台大藝術季　藝術席捲校園
(2016-05-29)
林謙耘
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Department of Communication and Technology
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傳播與科技學系
台大藝術季今年以星際大戰的ART2 D2作為主題，利用藝術詮釋對於未來的想像。
新一代　新銳設計師的舞台
(2016-05-29)
修瑞韓
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謝萱穎
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Department of Communication and Technology
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傳播與科技學系
新一代設計展為新銳設計師提供一個表現自我的舞台。
慈芳關懷　訴說精障者告白
(2016-05-29)
王雪琪
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Department of Communication and Technology
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傳播與科技學系
透過了解慈芳的運作，來認識精障朋友們對社會大眾的告白。
便「麗」貼　不願遺忘的事
(2016-05-29)
徐義薇
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Department of Communication and Technology
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傳播與科技學系
一探清交大烏克麗麗社期末成果音樂發表會。
臺南音樂季　不一樣的火花
(2016-05-29)
何佳頴
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Department of Communication and Technology
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傳播與科技學系
臺南五月音樂季今年於五月二十一日，在臺南虎頭埤風景區開始為期兩天的活動。
新聞盛會　獎落誰家
(2016-05-29)
許人文
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Department of Communication and Technology
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傳播與科技學系
第十三屆新傳獎不僅走出獨特在地風格，更為台灣培育更多新聞人才，共同為台灣媒體環境努力。
困獸之鬥　浪浪的悲歌
(2016-05-29)
黃吏玄
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Department of Communication and Technology
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傳播與科技學系
以動畫方式簡略的介紹台灣的流浪動物困境。