分子篩包覆奈米銀製作與應用
本實驗合成之奈米銀粒子產物分為水溶液與固態形式。奈米銀粒子水溶液態製造方法以多芽基之檸檬酸根離子當保護劑,再以NaBH4 還原生成奈米銀粒子。而固態形式之奈米銀粒子是先以四級銨鹽界面活性劑當保護劑,經過NaBH4 還原生成奈米銀粒子水溶液後,再用二氧化矽包覆奈米銀粒子,藉由高溫燒去保護劑,得到含奈米銀粒子之二氧化矽分子篩材料。 將含奈米銀粒子之二氧化矽分子篩材料產物浸在純水中,除了不會改變水溶液性質外,又能以分子篩通透的特性,讓奈米銀漸進地釋放出銀離子,而達到長效性抗菌效果。 至於具抗菌性棉衫或濾網的製作,則採直接浸泡在奈米銀粒子水溶液中的方法,使奈米銀粒子吸附於上,針對上述實驗非常成功,洗滌超過十次且放置時間長達一個月以上,其抗菌效果仍佳,表示此簡易法製成的棉衫或濾網具有長效性的抗菌功效,為本研究重大突破。 奈米銀粒子對環境的影響是利用黑殼蝦來測試,控制適當奈米銀粒子濃度,使黑殼蝦能生存,亦可達到水中殺菌的效果。本實驗為首次針對奈米銀粒子對環境影響的測試並獲得重大的成果。;In this study, two Ag nanoparticles samples including Ag nanoparticles in aqueous solution and in solid form were prepared. The Ag nanoparticles aqueous solution readily obtained from reduction of AgNO3 aqueous solution with NaBH4solution in the presence of the sodium citrate as protecting agent. To prepare the Ag nanoparticles@porous silica sample, cationic alkyltrimethylammonium surfactant was used as the protecting agent of Ag nanoparticles and template of the porous silica. The Ag nanoparticles@porous silica was synthesized via reduction by NaBH4, silicification in silicate solution and calcination for the removal of surfactant. When adding the Ag nanoparticles@porous silica, the property of the aqueous solution was not changed. In addition, the Ag+ ion was gradually released from the accessible silica matrix to achieve a long-lasting effect on anti-bacteria. To prepare anti-bacteria clothes and sieves, these objects were soaked in Ag nanoparticles aqueous solution. The Ag nanoparticles were spontaneously absorbed into the clothes and sieves. The anti-bacteria efficiency of the Ag-nanoparticles containing clothes and sieves still remains even after ten-time washing and a period of time longer than one month. These worthy results indicate that this synthetic method provides a simple way to prepare the long-lasting Ag-nanoparticles containing clothes and sieves for anti-bacteria application. To investigate the influence of the Ag nanoparticles on the environment, shrimps are used as testing objects. With a well control on the Ag nanoparticles concentration, the shrimps survived well and the bacteria content was reduced. It is the first time to have testing result about the effect of the Ag nanoparticles on the environment. Thus, this is the most remarkable achievement in our experiments.
小小細菌立大功-油類生物復育模式的探討
20 世紀初,石油的量產造就了人類文明前所未有的繁榮,然而由於運送、廢棄處理等因素,使得油類污染成為環境保護的重大議題。本實驗中,我們的研究主題為在受油污染的土壤中純化並鑑定出可分解油類之土壤菌和綠膿桿菌對可分解油類之土壤菌與這群土壤菌彼此之間的交互關係,藉此了解它們間的互動對環境生物復育的影響。我們由受油類污染的行道樹土壤中分離了約12 種的土壤菌,其中我們得到3 種對油類分解效果效果極佳的非綠膿桿菌(暫時命名為P7A、P7C、P7D)。經過菌種鑑定發現P7A、P7C、P7D 均為格蘭氏陽性菌。為了解這群可分解油類之土壤菌間的互動關係,我們針對分解效果最佳的P7A、P7C、P7D 作為研究對象,將菌落接種至含有鹽類與機油的液體培養基中震盪培養,並每隔一定時間測量其O.D 值。結果發現P7A、P7C、P7D 間的互動會導致其在以機油為單一碳源的培養液中之生長速度的改變,因此在行環境生物復育時須注意土壤菌間交互關係對其分解污染物速率的影響。此外我們由受油類污染的行道樹土壤中亦分離出了一些綠膿桿菌,因文獻指出,綠膿桿菌所分泌的綠膿素降低受油污染土壤中土壤微生物相的多樣性;因此,我們將由行道樹土壤中純化出的綠膿桿菌T3 與可分解油類P7A、P7C、P7D 進行交互作用觀察,發現T3 會侵占P7A、P7C、P7D 的既有菌落區,而平板培養基亦可清楚看出和T3 交接的P7A、P7C、P7D 菌落區寬度有明顯降低,因此我們認為T3 可抑制或殺死P7A、P7C、P7D,可得知綠膿桿菌會對可分解油類之土壤菌產生抑制或競爭關係。In early 20th century, the exploitation of petroleum transformed human civilization into a tremendously prosper stage. Because of the transportation and disposition of petroleum, the oil pollution has become a important issue in environmental protection. Besides, Chloropseudomonas spp. which can survive in many different environments and decompose lots of organic compounds. In this study, we want to find the bacteria which can utilize oil from machine oil-contaminated soil, investigating the interaction relations between Chloropseudomonas spp. and these oil-degrading soil bacteria. First, we classified these oil-degrading bacteria by the book called“Bergey’s Manual of Systematic Bacteriology.”We find three species of oil-degrading bacteria (P7A、 P7C、P7D) which are all grams-positive bacillus, possibly belonged to Aureobactreium、Curtobacterium、Cellulomonas、Oerskovia、Brochothrix、 Caryophanon. Second, in the study of the relationship between Chloropseudomonas spp. and the oil degrading soil bacteria, we found that Chloropseudomonas spp can considerably inhabit the growth of oil-degrading bacteria. Besides, there are also a great variety of interaction between three species of the oil-degrading bacteria. According to the result , the interaction might considerably affect the efficiency of oil bioremediation. Due to our analysis, we suggest that it is necessary to pay more attention to the interaction between bacteria when undertaking oil bioremediation.
磁場中的離子轉速-探討離子遷移速度變因
帶電的離子受到垂直的磁場與電場作用,會因為受到洛倫茲力而產生有趣的轉動現象。我們利用上述原理設計簡易的裝置設備,探討電解質溶液不同濃度、不同離子電荷數,受到不同離子間靜電力,產生不同的離子移動速度。經由所測量的時間與圓周運動的距離,可計算電解質的絕對遷移速度。由實驗結果推論在固定電場下,當電解質濃度降低,正、負離子間的相互作用力降低,離子遷移速度(migration velocity)加快,莫耳電導率 Λ(mole conductance)也隨之增加。同濃度時,電解質2-1 價型硝酸銅與2-2 型硫酸銅離子強度(ionic strength)不同,2-2型硫酸銅離子強度較大,遷移速度較小,莫耳電導率Λ 也較小。Because of the effect of Lorentz force, charged ion will have interesting rotation under the vertical magnetic and electric field. We use the above principle to design a simple instrument or tool, in order to evaluate and study the formation of different ionic mirgration velocities. The velocity of the charged ion in the instrument is affected by differences in the electrolyte, the charge differences of the ion tested and the differences in electrostatic forces between ions. From the experiment we can deduct that at a fixed constant electric field, when the concentration of the electrolyte is reduced, the interaction of forces between positive and negative ions will be reduced. When the migration velocity of ions increase, the mole conductivity Λ (mole conductance ) will also increase. At the same concentration, the ionic strength between copper nitrate ( 2-1valency type ) and copper sulfate ( 2-2 valency type ) are not identical. Copper sulfate, a 2-2 valency type has higher ionic strength, the velocity is slower and the mole conductivity Λ is also smaller.
表面粗糙結構對疏水性影響之應用與研究
本研究從大自然中之「蓮花效應」引發學習興趣與研究動機,在蒐集相關資訊與文獻後,發現疏水功能不只是防水,還關係著日常生活品質之許多材料特性,包括防水、撥水、防潮、防銹、防蝕、抗菌防污、自清潔…等。而影響固體表面疏水性之兩大特性,包括物理之表面粗糙度與化學之超低表面能,本研究針對物理之表面粗糙度與疏水性之關係做探討,以相同之化學特性來比較不同號數之工業用砂紙之疏水行為,並就廣泛被引用之兩種模擬表面粗糙度與疏水性關係之模式:Wenzel and Cassie model,比較現有文獻對兩種模式之特性,選擇Cassie model 來進一步實驗驗證,以量測之平均接觸角 Θ 推算Cassie model 之表面粗糙係數Φ 值,並簡化不同砂紙顆粒模型為相同粒徑之球狀,以簡化之方程式來求得水珠與砂紙顆粒之實際接觸面積與球心夾角 θ,以提供高中學校能在經費與設備之限制下,仍能有效應用與印證Cassie model,獲得砂紙顆粒直徑與球心夾角 θ 自然對數值之關係。並就疏水性之生活應用,建立接觸角與 Φ 之關係曲線,驗證實驗之方程式,與延續過去之科展成果,以實驗成果提出可行性應用之建議。The interest and motivation of the present work was introduced from “lotus effect” in nature. After we collected related literature and information, we found that the function of the so-called “superhydrophobicity” behaves not only water repellency, but also a variety of real-life applications, including anti-fog, anti-corrosion, anti-bacteria, anti-fouling, self-cleaning, and so on. Pervious studies have pointed out that two criteria affecting the performance of hydrophobic surfaces are physical (roughness) and chemistry (surface tension) properties. This study focused on influence of physically surface roughness on hydrohyphobicity. Based on an identical surface chemistry, we employed different types of industrial sandpapers to mimic the lotus leaf, and investigated the relationship between roughness and hydrophobicity by using two famous models: Wenzel and Cassie models. Comparing with their basic assumptions to our study, we applied Cassie model to confirm our experimental results, in where one Cassie parameter (?) was proposed to simplify the Cassie equation. This superhydrophobic behavior can be well predicted by the Cassie model. This study continues previous achievement and offers some practical utilization according to our\r experimental results.
約瑟夫問題
最後留下數字會是多少?該問題在台灣的全國中小學科學展覽出現多次。而資訊界演算法大師Donlad E. Knuth 在其著作The Art of Programing,CONCRETE MATHEMATICS (具體數學),針對該數列作詳細的說明;但是,不論是歷屆全國中小學科學展覽或是大師著作,對於該問題,都只是談及殺1 留β或是殺α留1。本研究利用獨創α分類、n 及k 分類、d 函數、b 函數及循環、n 及y 分類、碎形數列和演變關係,將約瑟夫問題探討範圍提升至殺α(個數)留β(個數),直到剩下最後1 個數時就不能再殺了,遊戲終止,倒數第k 個留下的自然數是多少?同時,本研究在殺α(個數)留β(個數)下,指定自然數y 為酋長,酋長不能被殺,殺到酋長時遊戲停止,求剩下的自然數有幾個?會發生什麼情形?The Josephus problem refers to what will be remaining when arranging n natural numbers in a circle and starting killing one and leaving the next one alive. The problem has been on display for many times in Taiwan National Primary and High School Science Exhibitions (as shown in Table 1). And, the information algorithm master, Donald E. Knuth has elaborated on the array in his works The Art of Programming, CONCRETE MATHEMATICS. However, both the past science exhibitions and the master’s works are limited to discussions on cases of killing 1 leaving β or killing α and leaving 1. This research employs uniquely created α classification, n and k classifications, d function, b function and loop theory to extend the Josephus problem scope to killing α leaving β to find out what the remaining natural number is by No. k counted recursively. Meanwhile, this research designates natural number y as the chieftain, which can never be killed. The game is over when the chieftain is to be killed. The problem is to work out how many natural numbers are remaining. And what happened?
Screening, Isolation, and Characterization of Fluorescent Proteins from Nudibranchs
Fluorescent proteins are used to label and tag tumor cells. These are also used in molecular cloning methods, and in monitoring cellular processes. However, the Philippines does not have a local source of fluorescent proteins, and thus imports these expensive chemicals from other countries. Possible sources of fluorescent proteins may come from marine organisms and certain plants. This work presents the screening, isolation, and characterization of fluorescent proteins from a potential local source—nudibranchs. The pigments of nudibranchs function to make their different body parts, as well as the cerata, brilliantly colored for defense and protection as in camouflage and aposematic behavior. The pigmentation in the skin of the nudibranchs was used as the fluorescent protein source. Crude protein extracts from the seven species of nudibranchs collected from Mabini, Batangas, Philippines were run through Reversed- Phase High Performance Liquid Chromatography (HPLC) for screening. Graphs of the absorbance of the seven species showed which species exhibit the most number of aromatic amino acids, the main component of fluorescent proteins. The species with the highest absorbance at 280 nm, which is Chromodoris willani, was run through the HPLC again for recovery and collection of fractions. The fractions were examined through fluorescence microscopy, wherein the samples were filtered at three emission ranges, the first at 450-470nm,the second at 515-545 nm, and the third at 600-650 nm, which corresponds to blue, green, and red, respectively. The proteins which emit at the said ranges were the only component allowed to pass through. The results, which are images of the excited proteins, showed that fluorescent proteins are present in the fractions of Sample 6—Chromodoris willani.
光觸媒(TiO2)對還原重金屬離子之研究
光催化氧化反應以半導體金屬氧化物為催化劑,進行有機性空氣污染物之快速分解反應。其原理係將半導體材質(如:二氧化鈦,TiO2),在適合之光能量照射下,將半導體激發成為具有氧化/還原能力之催化劑,可加速氧化還原反應之進行,迅速分解有機污染物。 研究動機在於利用TiO2在紫外光的照射下,將H2O 分解產生自由基,使其和水中的重金屬離子進行氧化還原反應,期待可以還原水中的重金屬藉以降低水中重金屬離子濃度,同時藉由使用界面活性劑對奈米微粒具保護作用,可回收重金屬奈米微粒。 由實驗結果得知在紫外光照射下,TiO2 使用量0.5 克,AgNO3(aq) 0.01M,照光24 小時其電導度值上升最多且在溶液表面觀察到銀白色銀金屬薄膜生成而所測得銀金屬析出量明顯增加。探討超音波振盪對TiO2還原力的影響得知,超音波震盪的時間越久,所上升的電導度值愈多。 探討常見的界面活性劑(陽離子型及陰離子型)對TiO2還原力的影響:從數據中可觀察到,加入陰離子界面劑時,電導度值明顯上升;而加入陽離子界面活性劑後,電導度值迅速下降,照光後電導度值也不理想。 探討日光及不同頻率的紫外光照射光源對TiO2還原力的影響:發現紫外光的波長愈短,銀金屬析出的量愈多。 探討除氧處理之溶液對TiO2 還原力的影響得知,除氧處理後所配製的AgNO3(aq)0.01M, 經照光24 小時後電導度值明顯上升,且在溶液表面觀察到大片銀白色銀金屬薄膜生成而所測得銀的析出量也大幅增加。 ;In the experiment, we used the properties of T i O 2 that can catalyzed by UV rays and breaking the molecules of water and produce free radicals, which free radicals can redox metallic oxide as accelerator to analyze organic pollutant briskly. We use different shinning time and to find the best effect of the redox reaction . So we want to use this attribute to begin the redox reaction with the metal ion (for example: Ag+) in water, expecting to reduce them. And then we can use this method to recycle the metal and to reduce the pollution in rivers. Throughout shining UV rays in 24 hours, we can find out the best effect of TiO2 reducing the metal ion solution. We can also find that we use ultrasonic first; the more redox it will have. In this research ,we can observed that if we put more anion surface-active agent, the more redox it will have. We find the effect of UV rays is better than visible light. The most important is that we deoxidize the metal ion solution, we can get the best effect of the redox reaction . In our research,we can't get the satisfing result of the copper sulphate (CuSO4) by TiO2 accelerating the redox reaction under UV rays.
「蓮」「環」密碼--環境因子對蓮花效應的影響
蓮花效應是指蓮葉表面具有奈米纖毛結構,因此只要葉面稍微傾斜,水珠就會滾離葉面,在我們生活週遭,許多植物具有蓮花效應。本實驗選擇彩葉山漆莖作為研究材料,因為我們發現在同一植株上,嫩葉的蓮花效應最佳,而老葉幾乎無蓮花效應。當彩葉山漆莖的新葉轉為老葉,蓮花效應會減弱,甚至消失。我們以不同水量、土壤酸鹼值及光照作為變因,來探討蓮花效應改變的原因,結果發現水量並非主要影響蓮花效應改變的變因;土壤過酸或過鹼,會減弱新葉及嫩葉的蓮花效應;置於暗室則使整株彩葉山漆莖所有葉面皆無蓮花效應。許多植物的性狀,在老化或面臨環境改變時,會將控制性狀的基因開啟或關閉。因此,我們推論,當環境因子改變時,植物的蓮花效應可能是經由基因層次的調控,藉以增強或減弱此性狀的表現。如果不是基因的開啟或關閉,則有可能僅是葉表面的結構發生些微的改變,真正詳細的機制仍有待進一步的確認。;We choose Breynia nivosa (Bull ex W. G. Smith) Small as a model plant to study the lotus effect on the leaves for the reason that on the same chosen plant the new-born leaves have the best lotus effect while the elder ones have little lotus effect. When the new leaves turns into elder ones, the lotus effect also turns weaker or even vanishes. To explore the exact mechanisms, we take water quantity、soil pH、and light density as the experimental factors. The results show that water quantity cannot affect the lotus effect on all leaves, change in soil pH can decrease the lotus effect on the new and new-born leaves, and dark treatments can eliminate the lotus effect on all leaves. When the environments change, the phenotypes of plants could also be changed to adapt to the new conditions by turning on or off genes. Therefore, we suggest that the lotus effect on the leaves is also controlled by genes to increase or decrease its phentype so as to adapt to the changing environments. If not, it may simply be a little change of the surface structure of the leaves. The detailed mechanism remains to be confirmed further.