FeSO4 催化雙氧水製造氧氣之研究
1894年H.J.H Fenton首先發現亞鐵離子催化過氧化氫具有強氧化力,故將其稱為” Fenton reagent”。在本研究裡將對Fenton做一深入探討,探討在不同 pH值溶液、不同Fe2+濃度比下產生氧氣的效能,並且間接也印證了 HO · 自由基在 Fenton reaction 製氧過程中的重要性。
亞鐵離子在Fenton reation ,並非單純只當催化劑。當 pH =3.0、4.0、5.0時,過氧化氫與硫酸亞鐵濃度比為1:0.25、 1: 0.5 、1:1 時,當 FeSO4濃度增大時,氧氣產量依序增加。依反應機構解釋,可確定亞鐵離子為Fenton reaction 反應速率之重要因子。但,當pH 較高且硫酸亞鐵濃度為過氧化氫兩倍時,反而抑制氣氣的產量。且若當條件為 pH = 5且過氧化氫與硫酸亞鐵濃度比為 l : l 時,氧氣生成平衡體積最接近最大體積,可證實過氧化氫在短時反應最完全。由結論中幾個論點可歸納出,常實驗條件為 pH = 5且過氧化氫與硫酸亞鐵濃度比為 1: 1 時,氧氣的收集會有最好的效果。
In 1894, H. J. Fenton first found that the ferrous iron can catalyze hydrogen peroxide with the strong oxidizing ability; so we called “Fenton’s Reagent”. This discovery will make a further research to explore the efficiency of the production of oxygen that under a series of different pH values, arid different proportions of Fe2+ concentration . This experiment indirectly proves that the free radical of hydroxyl ion as a important role to produce oxygen in the Fenton reaction. In the Fenton reaction, the ferrous iron is not simply utilized as the catalyst. While the pH value is 3 4 and 5, and the proportion of hydrogen peroxide to ferrous sulfate is 1:0.25, 1:0.5, and 1:1, when the concentration of ferrous sulfate increases, the volume of the oxygen produced will increase simultaneously. According to the reaction mechanism, we affirm that the ferrous iron is a significant factor in the Fenton reaction rate. But, if the pH value is higher, and the concentration of ferrous sulfate is the double of hydrogen peroxide, the rOl1jJj1C of oxygen is refrained reversely. And as the pH value is 5, and the proportion of hydrogen peroxide to ferrous sulfate is 1: 1, the equilibrium volume of the oxygen produced will approach the maximum, which proves that hydrogen-peroxide can completely react in a short time. According to the conclusion, we conducted that as the pH value is 5, arid the proportion of hydrogen peroxide to ferrous sulfate is l:1.which is the optimum condition of the oxygen preparation.
反泡泡之形成、存活與破滅的物理特性探討
This research mainly discusses an antibubble the interesting physical phenomenon that isn’t generally noticed .We use digital video cameras to obtain the experimental results, and pick up and analyze them with the computer. The experimental result as follow: (1) The formation of an antibubble mainly relates with the surfactant ingredients.The washing liquid, which has the surfactant characteristics the thinner its concentration; the lower the success rate of the antibubble. (2) The size scope of an antibubble is situated between 0.35 cm to 0.6 cm, and the size of the antibubbles produced by different densities of washing liquids are not obviously different. (3) The interior radius of an antibubble is approximately 3/4 times of the outer radius. (4) The survival time of an antibubble is mostly within 70 seconds, some minority surpasses for 100 seconds. Its average survival time is 40.65 seconds. (5) When the temperature of water the underneath liquid is between 20℃ to 90 ℃, the higher its temperature; the lower the success rate of the antibubble. After the temperature reaches 80 ℃, the success rate of the antibubble turns into 0. Besides, the higher the temperature of water; the shorter survival time of the antibubble. (6) Antibubble die by itself can be induced two kinds of types. One is centralism death, and another one is vibration death. Vibration death is less common and rare. Its dead process lasts longer time than the general antibubble, and also has 2 to 3 times back and forth vibration. 本研究主要要探討「反泡泡」(antibubble)這個一般不被注意到的有趣物理現象。我們用數位攝影機進行實驗結果的取得,並以電腦進行擷取與分析。實驗結果為:一、 反泡泡的生成主要與界面活性劑的性質有關。洗碗精這樣具界面活性劑特性的物質濃度越稀薄,反泡泡的成功越低。二、 反泡泡的大小範圍介於0.35cm 至0.6cm,不同濃度所產生的反泡泡大小並無明顯之差異。三、 反泡泡的內半徑約為外半徑之3/4。四、 反泡泡存活時間大多在70 秒之內,僅有少數超過100 秒,平均存活時間為:40.65 秒。五、 承接液體在20℃至90℃的範圍中,隨著溫度的增加反泡泡生成成功率越下降,在80℃之後,成功率降至0。且溫度增加會使反泡泡存活的平均時間下降。六、 反泡泡自行破滅可以歸納出兩大種類型。其一為:「集中破滅」;另一為「震盪破滅」。「震盪破滅」情形較為特殊少見,其破滅過程較一般反泡泡來得更久,且有2 至3 次的來回震盪。
畢氏定理演繹的正三角形分割研究
畢氏定理(a²+b²=c²)歷經25世紀,發現了數百種的幾何論證法;而畢氏定理演繹出的正三角形 ( (/4) a²+(/4) b²=(/4) c² )幾何分割研究,卻一直沒有人研究。因此,承襲著之前處理幾何問題的經驗,決定挑戰畢氏定理演譯的正三角形分割研究。本文研究兩正三角形,經切割後拼成另一大正三角形;期間以GSP及AutoCAD繪製分析幾何圖形,並建立了4種分割模式,得到了3段式「最佳分割模式」及準「通用分割模式」,提供這方面問題一個可應用於所有條件之完善解決方案。本研究成果豐碩,補足了相關領域的空檔,且可製成益智又富挑戰性之拼圖系列,不管用做教具或遊戲,對建立意至己和相關資料有莫大貢獻!
Twenty five centuries after its discovery, hundreds of proofs have been given for the Pythagorean Theorem (a²+b²=c²). But, research about regular triangle dissection extending from Pythagorean Theorem has always been lacking. So, based on previous experience with geometric dissection problems, I have decided to do a research on regular triangle dissection extending from Pythagorean theorem. This research dissects two regular triangles and assembles them into a large regular triangle. Using GSP and AutoCAD to draw and analyze geometric shapes, four dissection models and nine dissection methods are constructed. The extreme values under all conditions are also discussed, as are the best and generic dissection models. There is a Three-section type “best dissection model” and a semi “generic dissection model.” offering a perfect solution to this kind of problem that can be used under all conditions. This study yields numerous results as well as filling in blanks in similar fields. It can also be made into challenging jigsaw puzzles for educational or entertainment purposes.
銅影響大豆及田菁根部生長、細胞死亡和訊息傳遞
隨著迅速的工業化,重金屬汙染已是嚴重的環境問題。在植物中,當植物體內累積過量的重金屬,對於植物根部、葉部等器官的生長與發育有嚴重的影響或傷害。銅離子為植物生長所必須之重金屬,但是過量銅離子會導致細胞死亡,生長受到抑制。本實驗以大豆( Glycine max )及田菁( Sesbania roxburghii )為植物材料,藉由Evans blue 染色法、螢光染色、西方墨點法、反轉錄聚合?鏈鎖反應等,觀察過量銅離子影響植物根部生長、細胞死亡和細胞訊息傳遞物質變化之情形,並探討過量銅離子影響大豆根部細胞死亡的訊息傳遞路徑。過量銅離子會限制植物根部的生長及造成根部細胞死亡。以螢光染色觀察根尖(ROS, reactive oxygen species)、Ca2+累積情形,根尖細胞Ca2+、ROS 累積隨處理銅濃度的增加而上升,可能影響細胞死亡程度。以Ca2+螯合劑EGTA 和W-7(CDPK(calcium-dependent protein kinase)、Calmodulin 抑制劑)前處理發現可以降低過量銅離子對大豆根部的細胞死亡程度,推測Ca2+、CDPK 參與銅引發大豆根部細胞死亡的途徑。為檢驗MAPK 參與根部細胞死亡的途徑,以西方墨點法偵測根部細胞MAPK 的TEY 或TDY 磷酸化,實驗結果發現,隨著過量銅離子濃度的升高,田菁、大豆根部42-kDa MAPK磷酸化情形有上升之趨勢。以RT-PCR 分析大豆MAPK1 及MAPK2 基因之表現量,發現在銅處理時大豆之MAPK1 和MAPK2 基因的轉錄情形增加。大豆( Glycine max )及田菁( Sesbania roxburghii )皆屬於豆科植物,可作為綠肥植物。探討銅影響大豆、田菁細胞死亡之訊息傳遞路徑,希望進而控制生物體所受的毒害情形及訊息傳遞途徑,加強生物體對重金屬的防禦機制,未來可以以基因轉殖等基因工程技術,轉入抗重金屬基因或增強植物體對抗重金屬的能力等,作為綠肥植物、抗重金屬植物吸 附重金屬來復育土地達綠色淨化等用途。 Many heavy metals are necessary for plants, but excessive quantities directly affect plant growth and survival of organisms, cause cell death, or even affect human life indirectly. Cu (copper ion) is a heavy metal, which is one of micronutrients essential for normal growth and development of plants. The purpose of this experiment is to study the effect of excessive copper on Glycine max and Sesbania roxburghii root tips. I conducted some experiments by means of Evans blue staining (analysis of cell death), western blot analyses, and fluorescence microscope in order to examine the way copper results in plant death. Measurement of root length and analysis of cell death showed that excessive copper could bring about the inhibition of plant growth as well as cell death. With fluorescence microscope, I found that excessive copper might increase the level of copper-caused reactive oxygen species (ROS) in both the root tips of Glycine max and Sesbania roxburghii. In addition, I used Oregon Green 488 BAPTA-1 so as to assess the accumulation of calcium ions in root tips and found that the exposure of root tips to excessive copper results in the accumulation of calcium ions. To investigate whether calcium ions and calcium-dependent protein kinase (CDPK) play a role in the cell death caused by excessive copper, I tested W-7, calmodulin and CDPK inhibitors, and EGTA, Ca2+ chelating agents, before copper treatment – immersing copper in CuCl2. In this way, plant cells would be effectively prevented from copper-caused death. Besides, to find out whether copper activates MAPKs in plant cells, I took advantage of western blot analysis with Phosphor-Map kinase Antibody and Map kinase Antibody. The results revealed that excessive copper might lead to TEY or TDY motif phosphorylation of approximate 42- and 64-kDa MAPKs in the cells of Glycine max root-tip and approximate 42-kDa MAPKs in the cells of Sesbania roxburghii root-tip. Furthermore, with RT-PCR, I found that the transcription of Glycine max MAPK1 and MAPK2 mRNA happens more frequently in root cells after copper treatment. In addition, this study suggested that the MAPK cascade CDPK pathway may function in the heavy-metal-signaling pathway in plant, and that calcium ions and ROS might get involved in the copper-caused death of plant cells. By studying signal transduction against heavy-metal toxicity in the plants, we can know how the organisms protect themselves. Sesbania roxburghiivv (or Glycine max), as green manure, could be used for metal-hyper-accumulator with the help of genetic engineering in the future.
估算土棲螞蟻聚落的新方法----以黑巨蟻(Camponotus friedae)為例
Estimated colony size is a basic work to count population of social insect up. It is not easy to measure any natural population accurately, in this respect, social insects here some advantages and some disadvantages over non-social ones. Previous studies have focused largely on the experimental colony of ants, such as Lasius niger, Myrmica sabuleti and Formica rufa, in the artificial nest. Furthermore, base on the division of labor, traditional Mark-Recapured Methods can not be used to measure complete colony of ant correcty. Here, we show that new method has be set up to calculate the colony of the ground black-giant ant, Camponotus fruedae,with a new indicator, ant hill. Predictions about the division of labor introduced to amend the formula of estimated population are discussed.本實驗探討黑巨蟻的蟻丘之形狀和生物意義,並分析利用何種方法能估算最準確的聚落大小。利用幾何圖形證明黑巨蟻會築似圓的蟻丘,並利用標識捕捉法的Petersen method(又稱為Lincoln index)、Schnabel method 和蟻丘大小重量,來推算黑巨蟻聚落之大小。發現黑巨蟻會築似圓度90%的蟻丘,而且標識捕捉法的Petersen method(又稱為Lincoln index)、Schnabel method 並不能精確的推算出黑巨蟻之聚落大小;應使用黑巨蟻之蟻丘的重量當作參數來推算,才不會忽略幼蟲的存在。