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翩翩起舞--氣流對翼片浮升的研究

本研究利用塑膠投影片、吸管、黏膠等簡易材料,自製許多不同的翼片,以自製的浮升高度測試架測量雙片翼浮升的高度。發現要使雙片翼能夠穩定螺旋轉動浮升,以翼長12㎝、翼寬3㎝、雙翼夾角成水平180度、底部高度2㎝為最佳。以側吹氣流使單片翼浮升的研究中發現:翼面水平夾角35度且翼片面積越大,迎風產生的上升浮力越大。接著利用三個單片翼成功組成一個能穩定旋轉浮升、永不掉落的三片翼。最後用四個單片翼組成一個能伸展與收縮、有節奏向上爬升的毛毛蟲。

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溼地的勇士-海茄苳呼吸根與抗鹽逆境之研究

本研究觀察海茄苳四種呼吸根在形態學上的異同,並以顯微鏡觀察四種呼吸根的構造,\r 推論四種呼吸根的功能:出水呼吸根為露出土面吸收大氣中的氣體;纜狀根為支持植物本體\r 及運送由出水呼吸根吸收之氣體至植物本體;支持根為支持植物本體;營養根主要為吸收土\r 壤中的水分及養分。其次觀察海茄苳與其它植物葉片的構造、氣孔數量、氣孔型態、土壤的\r 差異並測量植物二氧化碳產生量,推論海茄苳需要呼吸根的原因為:一、葉片氣孔數量過少,\r 二、生長環境嚴酷不利於吸收養分及空氣,三、呼吸作用率較差。然後觀察海茄苳在不同濃\r 度鹽分的逆境下之泌鹽量、根部生長速率、葉片及根莖形態及存活天數。最後測量葉片表面\r 的導電度、內部電阻值及觀察有無老葉的方式,來推論海濱植物抗鹽分逆境的方法,發現:\r 一、海茄苳、海馬齒、馬氏濱藜可以泌鹽方式排鹽,二、林投、水筆仔等植物可以拒鹽方式\r 排鹽,(3)三、鹽定及海馬齒可以落葉方式排鹽。

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線上教學資源

益智遊戲易位棋中的數學思維

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粘花惹草-天然指示劑

探討各種蔬果植物在各種酸鹼值下不同的顏色變化、滴定實驗中之效果、 黑豆取代甲基橙的應用、紫色高麗菜及葡萄做為雙指示劑之可行性及指示日常生活用品之酸鹼性。經彩環實驗後觀察到,在較強酸鹼中每種天然指示劑的變化皆最為明顯;滴定實驗中,發現紫色高麗菜及葡萄有三種不同的顏色變化;黑豆及羊蹄甲有兩種不同的顏色變化,紅鳳菜變化不明顯。根據上述兩項實驗,延伸其應用性,發現黑豆能有效取代甲基橙;紫色高麗菜及葡萄雖有三種不同的顏色變化,但應用於雙指示劑效果卻不佳;選用顏色變化較明顯指示劑葡萄及紫色高麗菜作為指示日常生活用品之指示劑,指示功能皆佳。

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Effect of Certain Plant Extracts on Fruit Set and The Prevention of Jatropha curcas Linn’s Insect Pests

The objectives of this study were to investigate (1) the floral biology of Jatropha curcas Linn. as well as its possible pollinators, (2) the correlation between the number of pollen on stigma and the frequency of floral visitors, (3) the attractiveness of essential oil extracts from three species of Lamiaceae, i.e. Hyptis suaveolens, Plectranthus ambonicus and Orthosiphon aristatus, to Apis florae, (4) the repellent effect of crude extracts from three species of Graminae, i.e. Imperata cylindrica, Eleusine indica and Dactyloctenium aegyptium, on Polyphagotarsonemus latus, and (5) the effect of appropriate combination between lamiacean essential oil and graminaceous crude extract on the percentage of fruit setting and insect pest protection. \r Jatropha curcas is monoecious plants with tiny male and female flowers borne on the same paniculate cyme. One plant produces 15-30 inflorescence. Each inflorescence composes of 70-120 florets, and only 4-8 florets are successfully setting fruits. Each flower takes approximately 17 days in developing from floral bud till floral opening. The appropriate time for pollination is from 09.00 am to 10.00 am. While bees, wasps, hornets, flies and dragonflies are its potential pollinators, mites, aphids and worms are its harmful insect pests. \r Three volumetric, 1, 3, 6 and 9 ml, of each essential oil extracts were separately sprayed on each observed inflorescence. According to the experiment, 6 and 9 ml of each of the essential oil extracts give similar effective outcome, However, The H. suaveolens extract at 6 ml is the most effective attractant for A. florae. because it uses less of the oil extracts.\r Four concentrations, 0.1 %, 0.5 %, 1.0 %, 1.5 % and 2.0 % of each of the crude extracts from three graminaceous plants were sprayed on each tested plants separately. Concentations above 1.0% consistently provided an effective biocidal activity against Imperata cylindrica , however 1.0% is accecptable. because it uses a reduced level of the crude extracts\r The combination of H. suaveolens’s essential oil and I. cylindrica crude extract both significantly enhanced fruit setting of J. curcas and protected the plant from Polyphagotarsonemus latus without adverse effect on its pollinators.

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臉部皮膚會長出小小骨頭哦!皮膚多發性粟粒型骨瘤的發現,X光顯像,致?

臉部皮膚會長出小小骨頭喔!皮膚多發性粟粒型骨瘤的發現,X光顯像,治病機轉與雷射在治療上的應用。本篇研究是探討一種特殊又不易偵測的骨瘤,皮膚多發性粟粒型骨瘤(MMOC),利用各種X光顯像技術,應用在痤瘡病患,偵測其分佈、發生率和疾病之可能相關;並利用組織病理發現去推測致病機轉;且利用各種雷射光,在體內與體外進行治療性的探索,並獲致重要的結論如下:(1)MMOC非常常見,每個人都有可能發生,但臨床不易被偵測,跟性別無關,但與年齡增長成正相關;(2)病灶分佈包括額頭、眼皮、鼻子、臉頰及頸部,與痤瘡的病灶分佈十分類似,但與痤瘡的疾病活性與疤痕的嚴重度並無相關。(3)利用乳房攝影的斜切照影技術,是最簡易有效的偵測方式。(4)病理組織中有些皮膚腫瘤伴有MMOC存在,並非此腫瘤有其特異性。(5)MMOC是一個因為皮膚毛囊皮脂腺在不明顯的發炎下所造成的轉化型骨形成反應。(6)紅寶石雷射及銣-雅鉻雷射對色素性骨瘤是一有效的去除技術。鉺-亞鉻雷射及二氧化碳雷射磨皮技術,對嚴重痤瘡疤痕並有MMOC患者,亦為一良好治療方式。Multiple Miliary Osteoma Cutis(MMOC) is a kind of special condition and difficult to detect clinically. By using different kinds of X-ray techniques and compared the clinical data from the patients with acne of face, by observing the changes of skin tissue specimens for searching the possible mechanism of osteogenesis and by using scanning electron microscopic observation and energy dispersive Xray analysis for evaluating the biophysical effects on osteoma after Ruby, ND-YAG, Erbium:YAG or CO2 Laser irradiation, we concluded that: MMOC, a very common condition, may develop in everyone. MMOC can be easily demonstrated by the modified mammographic technique. The density of calcification in MMOC is not related to the sex of patients, the activity of acne, and the severity of atrophic scar but correlated with the age of the patients. MMOC, a non-specific condition, results from metaplastic ossification occurring within preexisting subclinical inflammatory processes of the pilosebaceous unit and may be found incidentally in different kinds of facial tumor. Ruby or ND-YAG laser may have some explosive effect on pigmented MMOC. CO2 or Erbium:YAG laser dermabrasion can be used to treat MMOC with acne scar.

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線上教學資源

如何由外觀簡單辨識火成岩和沉積岩呢?

火成岩係岩漿冷卻凝固所形成。在岩漿冷卻的過程中,熔點高的礦物先結晶成形,熔點低的礦物較慢冷卻,在剩餘的空間中結晶,因此會形成礦物彼此鑲嵌的岩理。沉積岩主要是陸地上各種岩石受到侵蝕之後,被流水搬運到海底層層堆積,所以會形成一層層的層理,組成顆粒因為經過長時間搬運、良好的淘選而變得圓滑且大小相當。 結晶明顯,色彩艷麗的火成岩,如花崗岩,是良好的石材,經常被裁切成石板,用於鋪設室內地板或戶外牆面。沉積岩若膠結不佳,顆粒容易剝落,如砂岩,多用於鋪設步道,或切割成磚型,作為建築外牆。

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「金」枝「玉」葉—金奈米與葉綠素的交互作用

本實驗在探討,當金奈米粒子和植物中的葉綠素產生鍵結作用力時,能量轉移的結果是否能幫助葉綠素激發電子。經由兩者混合後光譜的變化,發現兩者之間發生能量轉移。為探討此轉移現象和濃度的關係,我們將大小不同的金奈米和不同毫升數的葉綠素作用,並將其結果和金奈米與葉綠素的吸收強度和作比較,使用正規化的計算方法算出比值,由此看出兩者之間能量轉移的效率。當金顆粒約大於30nm時,正規化的數值隨的葉綠素濃度的增加而變大;而當金奈米顆粒約小於30nm時,則隨著葉綠素的增加而變小。Much attention is currently focused on chromophoric molecules because they can not only mimic natural antenna systems but also exhibit unique optical and physical properties. Chlorophyll , produced by extracting from green leaves, has electrostatic interactions with Au nanoparticles through carboxyl groups. Herein, we report the charge transfer between chlorophyll and Au nanoparticles using UV-vis electronic absorption spectroscopy. The efficiency of charge transfer from chlorophyll to Au nanoparticles was estimated by the normalization of Q-ban absorption intensity. From the observation of absorption intensity versus concentration of chlorophyll curves, we find that the efficiency of charge transfer is increased while the size of Au-particle is larger than 30nm, but decreased while the size smaller than 30nm.

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口蹄疫病毒鞘蛋白rVP1 誘發Prohibitin 之遷移

細胞凋亡具有控制生物體細胞數目之功能,能讓特定的細胞走向死亡,因此若能掌握其作用機制,便可能藉由調控細胞凋亡的發生,進而應用於癌症治療。前人研究(2.)指出,經基因重組技術純化之口蹄疫病毒鞘蛋白rVP1,會導致BHK-21的Akt 蛋白質去活化,引起細胞凋亡的現象。然而在其後續的研究中,卻發現到在BHK-21中大量表現磷酸化的Akt 蛋白質,並無法反轉由rVP1 所誘發之細胞凋亡。因此本實驗利用二維蛋白質電泳,尋找Akt pathway 以外之細胞凋亡相關蛋白質。目前已證明Prohibitin 此一蛋白質,在由rVP1 所引起之細胞凋亡中,有自細胞核移動至細胞質的現象。此外,亦經由實驗排除Prohibitin 位於Akt pathway 的可能性。Western Blot 之結果更顯示,經rVP1 處理後,Prohibitin 在很短的時間內便出現遷移的現象,故推測其具有調控細胞凋亡上游反應的功能。Apoptosis can lead some specific cells to programmed death, thus, it is a major way for creatures to control their cells amounts. If we can command the mechanism of apoptosis, we may use it as a therapy for cancer by artificial regulation of apoptosis. VP1 is one of the capsid proteins of Foot and Mouth Disease Virus (FMDV). A research (2.) has indicated that the recombinant VP1 (rVP1) can result in dephosphorylation of Akt in BHK-21, and then lead the cells to apoptosis. However, in their follow-up experiments, they discovered that even if they expressed great amount of phospho-Akt in BHK-21, it still couldn’t reverse the apoptosis induced by rVP1. Therefore, this experiment takes the advantage of two-dimension protein electrophoresis (2D) in order to find apoptotic proteins excluded from the Akt pathway. I have found that Prohibitin exports from nucleus to cytosol after rVP1 treatment. Furthermore, I eliminate the possibility that Prohibitin’s may be located in Akt pathway. The results of Western Blot also shows that protein amount of Prohibitin in BHK-21 increase after rVP1 treatment, hence the purpose of nuclear export of Prohibitin might not be to degrade it. It might have some much more important function in the process of exportation. Besides, Prohibitin exports to cytosol in quite a short time after rVP1 treatment. According to this phenomenon, I suppose that Prohibitin has a role as a regulator of apoptotic up-stream reactions.

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磁中乾坤-探討磁力的特性及其應用

本研究是從自然與生活科技領域中有關「磁鐵」、「力」及「機械」等單元出發,依據磁鐵的各種特性,研究如何精確測量磁鐵的吸力和斥力,並探討磁鐵吸力和斥力的相關性。最後,我們依據磁鐵吸力和斥力的特性,設計可估測重量的斥力秤,並且發展出物體落下時可減緩衝力和可提高平穩度的「磁力緩衝機」。我們利用一整年的時間完成這個研究,研究過程中,不僅覺得科學實驗非常有趣,還學習到如何改良實驗減少誤差,並將所了解的原理應用在生活中。

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深藍電位-洋流的霍爾效應

由於海洋中有許多帶電離子,這些帶電粒子會因洋流的流動而快速移動,而在地磁的作用下,同樣是帶電粒子在磁場中的流動,同樣是磁場方向垂直於運動方向,那麼,理論上也該有類似霍爾電位差的電位差。實驗的結果要與理論的預測V=vBL大致相符(V=霍爾電壓、v=流速、B為磁場、L為量測間距)。

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線上教學資源

石油用罄的危機

全球石油半數以上蘊藏在新生代(即最近的地質年代,距今約7000萬年前)的岩石中,古生代(2億3000萬~6億年前)岩石居第二,接著是中生代 (7000萬~2億3000萬年前)的岩石之中。石油的生成過程要經過千萬年,所以消耗量大於石油的生成必定會有消耗完的時候。目前世界各國都在研發新能源,即再生能源例如太陽能、風力、地熱、潮汐能或生質能等等,以減少對石油的消耗量,更可延緩未來一百年內石油用完的危機。\r 目前石油探勘與開採技術都比過去進步,降低開採成本,因此可對更深於地表的油田進行開採,所以在未來一百年內還是可以繼續使用石油的,但是隨油田枯竭、開採難度與成本提升,會造成石油價格逐步走揚。\r 石油只要在適當地點無時無刻都會生成,但是要達到可開採的經濟價值,過程是緩慢的需耗時千萬年。

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