Name: microscope contrast for live, unstained cells
Uploaded: 2023-04-30T11:59:41.000Z
Duration: 1 min 26 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.4

phase-contrast-and-differential-interference-contrast-microscopy

Phase Contrast and Differential Interference Contrast Microscopy

תאים חיים לא מוכתמים הם שקופים וקשה לראות אותם תחת מיקרוסקופ אופטי. ניגודיות פאזה וניגודיות דיפרנציאלית או מיקרוסקופ DIC מאפשרים ויזואליזציה שלהם על ידי יצירת תמונות ברזולוציה גבוהה יותר וניגודיות חדה יותר.
כאשר דגימה מוארת בניגודיות פאזה, חלק מהאור מפוזר על ידי רכיבי התא, בעוד השאר עובר ישירות דרכו. מידת העקיפה תלויה במדדי השבירה של מרכיבי התא.
כאשר האור המפוזר והאור הישיר מפריעים, חלקים מהמדגם נראים בהירים אם הגלים נמצאים בפאזה וכהים אם הם מחוץ לפאזה. הדבר יוצר תמונות בניגודיות גבוהה של אברונים גדולים ומקטעי רקמות דקים.
שינויים חדים במדדי השבירה יוצרים הילה סביב התמונה.
ממצאים כאלה נעדרים ב-DIC, המשתמש במקור אור מקוטב כדי לווסת את גלי האור העוברים דרך הדגימה.
ניגודיות התמונה תלויה בקצב השינוי של מדדי השבירה על פני הדגימה. שינויים תלולים יוצרים תמונות עם ניגודיות גבוהה עם אפקט תלת-ממדי לכאורה.
DIC עוזר לדמיין דגימות עבות כמו פרוסות מוח, ביצים או עוברים.

<ol>
	<li>Parker, N. et al. מיקרוביולוגיה: OpenStax., 2022. סעיף 2.4</li>
	<li>פרויליך, V.C., 2008. מיקרוסקופ ניגודיות פאזה וניגוד הפרעות דיפרנציאלי (DIC). JoVE (Journal of Visualized Experiments), (18), עמ' 844.</li>
	<li>Palima, D. and Glückstad, J., 2010. ניגודיות פאזה כללית: מיקרוסקופיה, מניפולציה ועוד. פיזיקה בת זמננו, 51(3), עמ' 249-265.</li>
	<li>אוברה, ב., רוברטס, M.A., Armitage, J.P. ו- Grau, V., 2013. זיהוי תאי חיידקים בתמונות מיקרוסקופ של הפרעות דיפרנציאליות. BMC ביואינפורמטיקה, 14(1), עמ '1-13.</li>
</ol>

מיקרוסקופ ניגוד פאזה ו- differential interference contrast

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מיקרוסקופי ניגוד פאזה

במיקרוסקופ עם ניגוד פאזה, הפרעה בין אור העובר ישירות דרך התא לבין אור שנשבר על ידי רכיבים תאיים משמשת ליצירת תמונות בעלות ניגודיות גבוהה וברזולוציה גבוהה ללא הכתמה. זהו הסוג העתיק והפשוט ביותר של מיקרוסקופ שיוצר תמונה על ידי שינוי אורכי הגל של קרני האור העוברות דרך הדגימה. מסלולי אורך גל משתנים נוצרים באמצעות עצירה טבעתית במעבה. המעצור הטבעתי מייצר קונוס חלול של אור הממוקד על הדגימה לפני שהוא מגיע לעדשת המטרה. המטרה מכילה לוחית פאזה עם טבעת פאזה. כתוצאה מכך, אור העובר ישירות מהמאיר עובר דרך טבעת הפאזה בעוד שאור שנשבר או מוחזר על ידי הדגימה עובר דרך הצלחת. זה גורם לגלים העוברים דרך הטבעת להיות בערך חצי מאורך הגל מחוץ לפאזה עם אלו העוברים דרך הלוח.

מכיוון שלגלים יש פסגות ושפל, הם יכולים להוסיף יחד (אם הם בשלב) או לבטל אחד את השני (אם מחוץ לפאזה). כאשר אורכי הגל הם מחוץ לפאזה, שקעי גל מבטלים את שיאי הגל, מה שנקרא הפרעה הרסנית. מבנים השוברים אור נראים אז כהים על רקע בהיר של אור לא נשבר בלבד. באופן כללי יותר, מבנים שונים בתכונות כגון מקדם השבירה יהיו שונים ברמות החושך. מכיוון שהוא מגביר את הניגודיות מבלי להזדקק לכתמים, מיקרוסקופ ניגודיות פאזה משמש לעתים קרובות כדי לצפות בדגימות חיות. מבנים תאיים ספציפיים, כגון אברונים בתאים אוקריוטים ואנדוספורות בתאים פרוקריוטיים, מוצגים היטב במיקרוסקופ של ניגודיות פאזה.

מיקרוסקופי Differential Interference Contrast

מיקרוסקופי Differential Interference Contrast (DIC) (הידועים גם בשם Nomarski optics) דומים למיקרוסקופי ניגוד פאזה בכך שהם משתמשים בדפוסי הפרעה כדי לשפר את הניגוד בין תכונות שונות של דגימה. במיקרוסקופ DIC נוצרות שתי אלומות אור שבהן כיוון תנועת הגל (קיטוב) שונה. ברגע שהקרניים עוברות דרך הדגימה או דרך חלל ללא דגימה, הן משולבות מחדש. ההשפעות של הדגימות גורמות להבדלים בדפוסי ההפרעות הנוצרים על ידי שילוב הקרניים. זה מביא לתמונות בעלות ניגודיות גבוהה של אורגניזמים חיים עם מראה תלת מימדי. מיקרוסקופים אלה שימושיים במיוחד בהבחנה בין מבנים בתוך דגימות חיות ללא כתמים.
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מיקרוסקופ ניגוד פאזה ו- Differential Interference Contrast

מיקרוסקופים עם ניגודיות פאזה
מיקרוסקופים בניגודיות פאזה, התאבכות בין אור העובר ישירות דרך תא לבין אור הנשבר על ידי תאים ...

Education

JoVE Core

Cell Biology

ביולוגיה של התא

Unit 1

יחידה 1

Visualizing Cells, Tissues, and Molecules

ויזואליזציה של תאים, רקמות ומולקולות

KEY TERMS AND CONCEPTS

מונחים ומושגים מרכזיים

microscope contrast for live, unstained cells

Phase-contrast and differential interference contrast microscopy help scientists see live cells without stains. Both methods boost contrast so thin, transparent structures become easier to study under the microscope.

Phase-contrast microscopes use interference between light that passes straight through a cell and light that is refracted by cell parts. The microscope uses an annular stop in the condenser to make a hollow cone of light. The objective lens also contains a phase plate with a phase ring. Light from the illuminator passes through the ring, while refracted light passes through the plate. This makes the light waves about one-half wavelength out of phase.

When waves are out of phase, their peaks and troughs can cancel each other out. This is called destructive interference. As a result, structures that bend light appear dark against a bright background. Differences in refractive index can also change how dark a structure looks. Because it does not require stains, phase-contrast microscopy is often used for live specimens. It can clearly show organelles in eukaryotic cells and endospores in prokaryotic cells.

Differential interference contrast (DIC) microscopy, also called Nomarski optics, uses a similar idea. It creates two beams of light with different polarization directions. After the beams pass through the specimen or through empty space, they are recombined. The specimen changes the interference pattern that forms when the beams come together.

DIC microscopy produces high-contrast images of living organisms with a three-dimensional look. It is especially useful for telling apart structures inside live, unstained specimens. Like phase-contrast microscopy, it helps reveal details that are hard to see with ordinary bright-field light.

Microscope Contrast for Live, Unstained Cells

microscope-contrast-for-live-unstained-cells

imaging biological samples with optical microscopy

imaging-biological-samples-with-optical-microscopy

How Light Microscopes Bring Samples Into View

Optical microscopy uses light and lenses to make tiny biological samples visible. Antonie van Leeuwenhoek built the first compound optical microscope in the 17th century to view blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister developed an essentially modern light microscope. During the 20th century, microscopes gained better magnification and resolution. A sample is placed on a glass slide and clipped onto the stage, which is the flat platform of the microscope. The...

phase contrast and differential interference contrast microscopy

Phase-contrast and differential interference contrast microscopy help scientists see live cells without stains. Both methods boost contrast so thin, transparent structures become easier to study under the microscope. Phase-contrast microscopes use interference between light that passes straight through a cell and light that is refracted by cell parts. The microscope uses an annular stop in the condenser to make a hollow cone of light. The objective lens also contains a phase plate with a phase...

fixation and sectioning

Microscope Slide Prep and Staining

Microscope slide preparation includes wet mounts, fixation, and staining. These steps help make specimens easier to see under a light microscope. They also help preserve cells and highlight important structures. A wet mount is the simplest slide preparation. The specimen is placed in a drop of liquid on the slide. A liquid sample can be added directly with a dropper, and a solid sample, such as a skin scraping, can be placed on the slide before the liquid is added. The liquid is sometimes...

immunofluorescence microscopy

Fluorescent Antibody Staining in Cells

Fluorescent antibody staining uses a fluorescence microscope to make cells and microbes visible in bright colors against a dark background. The microscope works with fluorochromes, which are fluorescent dyes that absorb energy from a light source and then give off visible light. Some fluorochromes are natural, such as chlorophylls. Others are added to the specimen to improve contrast. Common examples of fluorochromes include Texas red and FITC. The method can also use nucleic acid dyes such as...

immunocytochemistry and immunohistochemistry

immunocytochemistry-and-immunohistochemistry

Antibody Staining in Cells and Tissues

Immunocytochemistry (ICC) and immunohistochemistry (IHC) use antibodies to detect specific proteins or antigens in samples. ICC focuses on individual cells, such as blood cells and stem cells. IHC is used for tissue samples. These methods were first published by Albert Coons in 1941, when they were used to detect pneumococcal antigen in mouse tissue sections from mice infected with Pneumococcus. Both techniques can produce either a colored signal or a fluorescent signal. Enzyme-conjugated...

confocal fluorescence microscopy

Confocal Microscopy for Sharp Cell Images

Confocal microscopy is an advanced imaging method used to capture sharp fluorescence images. Its main advantage is that it blocks out-of-focus light from the sample with pinholes. That helps produce high-resolution images with strong contrast. Unlike a standard optical microscope, a confocal microscope uses a focused laser beam to scan the sample surface at different z-planes. This makes it especially useful for thick specimens, such as biofilms. These samples can often be examined alive and...

protein dynamics in living cells

Fluorescent Methods for Protein Movement

Protein movement in living cells can be measured with fluorescence-based methods such as FRAP, FRET, and PET. These techniques help scientists track how proteins move, interact, and change distance inside the cell. Fluorescent recovery after photobleaching, or FRAP, measures protein movement rates within the cell. In this method, a small region is exposed to a strong laser beam. The beam permanently bleaches fluorophore-tagged proteins in that area. Over time, bleached proteins diffuse away...

total internal reflection fluorescence microscopy

total-internal-reflection-fluorescence-microscopy

Surface-Only Imaging with TIRF Microscopy

Total internal reflection fluorescence microscopy, or TIRF, is a microscope method used to view fluorophores near a solid surface with a higher refractive index, such as a glass coverslip. It is useful when scientists want to study signals close to the cell surface. TIRF works when light from a medium with a lower refractive index, such as air, hits the glass coverslip at a critical angle. Instead of entering the glass, the light undergoes total internal reflection. This reflection creates an...

atomic force microscopy

Atomic Force Microscopy for Surface Mapping

Atomic force microscopy is used to map the surface details of materials. It can examine ceramics, glass, polymers, and biological samples. The method gives far more resolution than an optical imaging system and produces three-dimensional surface profiles instead of flat 2D images. The probe is the key part of an AFM setup. It includes the cantilever and tip assembly, and it is also the part that is replaced most often. Constant contact with samples wears down the tip, so probe choice depends...

super-resolution fluorescence microscopy

Sharper Cell Images with Fluorescence Microscopy

Super-resolution fluorescence microscopy gives sharper images than standard fluorescence microscopy by reducing the point spread function, or PSF. The PSF is the light pattern from a point source that makes it look blurred. Because of this blur, each fluorescent spot appears larger than it really is. Nearby fluorophores can also overlap through their PSFs and make the image less clear. Several super-resolution methods have been developed to improve image detail. Photoactivated localization...

overview of electron microscopy

Electron Microscopy: TEM vs SEM

Electron microscopy uses electrons instead of visible light to make images with much higher detail than a light microscope. Visible light limits the resolution of light microscopes, which usually magnify up to 1000X, and sometimes up to 1500X. Electrons have a much shorter wavelength, about 0.005 nm, so they can produce resolution as fine as 0.05 nm. An electron microscope can also magnify images up to 2,000,000X and reveal subcellular structures and some molecular structures, including single...

scanning electron microscopy

How SEM Reveals Surface Details

A scanning electron microscope (SEM) reveals the surface details of a sample with an electron beam. The beam scans across the sample in a two-dimensional pattern. SEM can image areas from about 1 centimeter down to 5 micrometers wide. SEM is useful for studying bacteria, viruses, tissues, and larger samples such as insects. Conventional SEM can produce magnification from 20X to 30,000X. It also offers spatial resolution of about 50 to 100 nanometers. The process starts when the electron gun...

transmission electron microscopy

How TEM Reveals Tiny Structures

Transmission electron microscopy uses electrons to reveal very small structures inside a specimen. The technique grew from the first electron microscope prototype developed in 1931 by physicist Ernst Ruska. He built on the idea that magnetic fields can direct an electron beam, just as lenses direct light in an optical microscope. In a transmission electron microscope, a hot tungsten element produces electrons. An electron gun then accelerates them with a potential difference, giving the beam...

preparation of samples for electron microscopy

preparation-of-samples-for-electron-microscopy

Electron Microscopy Sample Prep Methods

Electron microscopy sample prep methods help biological samples survive imaging in TEM and SEM. Before a specimen can be viewed, it must be fixed, or stabilized, so the electron beam does not damage it. It also must be dried well, or desiccated, because the microscope uses a vacuum. Fixation should happen as quickly as possible. Once a sample leaves its natural environment, its properties begin to change. In tissue samples, oxygen levels can drop and change the appearance of mitochondria. That...

immunogold electron microscopy

Immunogold Labeling in Electron Microscopy

Immunogold labeling in electron microscopy uses antibodies and tiny gold particles to find specific proteins in cells and tissues. The gold particles are very electron-dense, which means they show up clearly in electron microscope images. This gives researchers a high-resolution way to see where proteins are located and to compare their amounts under different stimulation conditions. The method can reveal proteins on the cell surface and inside cells. It has been used to study proteins...

cryo-electron microscopy

Cryo-EM for Native Biomolecule Imaging

Cryo-EM, or cryo-electron microscopy, lets scientists image biomolecules in their frozen, native state. It avoids the dehydration, fixation, and staining used in conventional electron microscopy, which can distort samples and create artifacts. It also reduces damage from the electron beam by using gentler imaging conditions. This method is useful when other structure tools have limits. X-ray diffraction needs a molecule to form a crystal, and that is not always possible. Even when...

electron microscope tomography and single-particle reconstruction

electron-microscope-tomography-and-single-particle-reconstruction

3D Imaging with Electron Microscopy

Transmission electron microscopy (TEM) can build 3D images of biological samples. It does this with electron microscope tomography and single-particle reconstruction. Tomography can show cell parts or small cells in vivo, while single-particle reconstruction is used for macromolecules and macromolecular complexes in vitro only. Electron tomography can be done in TEM or in STEM, which stands for scanning transmission electron microscopy. STEM is mainly used for thick biological specimens. It...

key terms and concepts

Learn how phase-contrast and DIC microscopy reveal live, unstained cells by using light interference to boost contrast and show fine structures clearly.

Microscope Contrast for Live, Unstained Cells | JoVE K12

cell biology

JoVE Core Cell Biology illustrates complex cellular processes in easy-to-understand yet comprehensive animated video lessons. This collection focuses on the essential components and functions of cells, including organelles and membranes, cellular transport, and cell energetics. It is complemented by scientist-in-action videos that demonstrate the application of cell biology in real-world research experiments.

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Compare and contrast the general structures of plant and animal cells. Compare and contrast the general structures of prokaryotic and eukaryotic cells.

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A. Cells have characteristic structures and functions that make them distinctive.

B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.

C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.

D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.

Microscope Contrast for Live, Unstained Cells

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