科學教育 Science Education (最新 New)
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0 個讚 148 次播放力矩描述由一道力對支點所產生的旋轉效應。在日常生活中，許多情況都應用到力矩的概念，例如蹺蹺板。本資源透過實驗短片，探索平衡力矩的不同方法。
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0 個讚 46 次播放物體被拋出後，會受到地球重力影響而向下墜，此運動稱為拋體運動。本資源展示以高速攝影機拍攝的實驗短片，解釋拋體運動的原理。
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0 個讚 2,777 次播放本片介紹教育局在中小學以普及化、趣味化、多元化的方式，大力推動 STEAM 教育，為學生打好基礎，配合香港未來發展創科的大方向。重點包括： - 加強創科學習，鞏固學習數理科技的基礎； - 進一步加強專業培訓，裝備教師創新科技及其應用的知識； - 加強推動電子學習，提升STEAM範疇的學與教效能；…
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0 個讚 11 次播放When an object is thrown out, it experiences the gravitational pull of the Earth and falls. Such motion is known as projectile motion. This resource will …
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0 個讚 31 次播放Moment describes the turning effect of a force about the pivot. The concept of moment is frequently applied in daily life, such as seesaws. Through experimental…
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0 個讚 426 次播放在進行微生物實驗之前，我們必須建立一個無菌區域；實驗過程中亦要確保各操作和工具不被細菌污染。本短片介紹無菌技術的細節，例如：如何建立無菌區域，如何消毒容器的開口、接種環及塗抺棒。
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0 個讚 147 次播放平板劃線能夠分離在瓊脂平板上的單一細菌及其形成的菌落。本短片介紹如何以火焰消毒接種環；在瓊脂平板上進行劃線的技巧；以及如何在劃線時及觀察菌落前避免培養基受到污染。
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0 個讚 73 次播放本短片介紹進行塗布平板及傾倒平板時所使用的工具及技巧。
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0 個讚 56 次播放在估算細菌樣本的含菌量前，我們往往需要先將細菌樣本或液體培養物樣本進行連續稀釋才進行培養，以得出菌落數量適合數算範圍的瓊脂平板。本短片介紹連續稀釋的方法和原理，以及數算平板的技巧和步驟。
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0 個讚 130 次播放本短片介紹培養細菌的方法，包括使用無菌技術獲取單個菌落或極少量的液體培養物並分別轉移到新的瓊脂平板上或液體培養基中，以及利用光密度或濁度估算培養物中的細菌含量。
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1 個讚 91 次播放本短片介紹如何製備培養基及傾倒瓊脂平板，當中包括使用高壓滅菌器將瓊脂培養液、試劑瓶和培養皿等進行高壓滅菌 。 片中除了介紹傾倒瓊脂平板的注意事項(例如在無菌環境進行倒板)，亦會介紹在瓊脂溶液添加抗生素和保存瓊脂平板的方法。
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0 個讚 44 次播放本短片介紹如何使用拭子棒從環境表面收集微生物樣本及如何擦拭所選區域以獲得最多的微生物樣本。此外，片中亦有介紹收集來自不同水源(水龍頭、魚缸或游泳池)的水樣本的方法。
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0 個讚 45 次播放We have to create a sterile field before we perform experiments on microorganisms, this is to ensure no contamination of apparatus by other microorganisms during the…
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0 個讚 21 次播放Streak plate can isolate a single bacterium and the colony formed on the agar plate. This video introduces the flame-sterilisation of inoculating loop, the technique of…
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0 個讚 27 次播放This video introduces the tools and techniques for performing spread plate and pour plate.
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0 個讚 17 次播放When we need to estimate the amount of bacteria in a sample, we usually perform serial dilutions of the bacterial sample or broth culture sample before culturing. This…
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0 個讚 18 次播放This video introduces the method of culturing bacteria, which includes the transfer of one single colony or a tiny amount of broth culture to a new agar plate or a fresh…
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0 個讚 30 次播放This video introduces the method of preparing culture media and pouring agar plates, including autoclaving of agar solution, reagent bottles and Petri dishes. Besides…
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0 個讚 9 次播放This video introduces the collection of microbial samples from some environmental surfaces using swab sticks, as well as the way of swabbing in order to collect as many…
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0 個讚 22 次播放After performing microbiological experiments, it is important to sterilise the used apparatus and unwanted cultures properly before disposal, so that the environment…
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0 個讚 14 次播放Gram staining is a common method to stain and to differentiate bacteria into two main groups: Gram positive bacteria (when stained purple) and Gram negative bacteria…
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0 個讚 60 次播放Micropipettes are used to draw and transfer a small amount of liquid accurately. There are 3 steps in transferring solution using micropipettes, i.e. setting the volume,…
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1 個讚 49 次播放Gel electrophoresis is one of the most common techniques in biotechnology, which can separate DNA samples (e.g. PCR products) according to their molecular sizes under an…
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0 個讚 13 次播放This video introduces the methods of mixing the substances in a centrifuge tube (i.e. finger-flicking and wrist-flicking), as well as the use of benchtop centrifuges and…
