Henan Biological MicroscopeIt is a "window" for exploring the microscopic world, using optical or electronic amplification techniques to magnify cells, microorganisms, and tissue structures that are invisible to the naked eye by hundreds to tens of thousands of times, revealing the mysteries of life activities.
1、 Core Logic: Principles of Optical Amplification and Imaging
The core of a biological microscope is to magnify tiny biological structures through an optical system, and its basic logic can be broken down into three modules that work together:
1. Optical amplification system
Using a combination of objective lens and eyepiece for magnification, the objective lens (4 × -100 ×) is responsible for magnifying to form an inverted real image, while the eyepiece lens (10 × -20 ×) is used for secondary magnification to form a virtual image. A better microscope corrects the chromatic aberration of red and blue light through a complex achromatic objective lens, pushing the resolution limit to 0.2 nanometers (close to the visible light theoretical limit of 0.2 μ m). The oil mirror uses immersion oil (refractive index 1.515) to fill the gap between the objective lens and the sample, reducing light refraction loss and achieving high magnification observation of over 1000 times.
2. Lighting and imaging control
The Kohler lighting system uniformly projects the light source (LED/halogen lamp) onto the sample through a spotlight, adjusts the depth of field with an aperture stop, and controls the imaging range with a field stop. Fluorescence microscopy integrates excitation filters, dichroic mirrors, and emission filters on this basis, using specific wavelengths to excite fluorescent markers (such as DAPI staining cells emitting blue light), achieving specific structural visualization. Confocal microscopy eliminates out of focus stray light through point scanning and pinhole filtering, and improves axial resolution to 0.5 μ m, enabling the construction of three-dimensional tomographic images.
3. Digital extension
Modern microscopes are equipped with CMOS/CCD sensors, which convert optical images into digital signals and use image analysis software (such as ImageJ) for cell counting, fluorescence intensity quantification, and other analysis, promoting the transition from visual observation to data-driven research.
2、 Industry Applications: From Basic Research to Industrial Implementation
1. Life science research
In the field of cell biology, fluorescence microscopy is used to track mitochondrial dynamics (MitoTracker labeling) or observe cell division cycles; Transmission electron microscopy (TEM) reveals the ultrastructure of the virus (such as the distribution of the spike protein of COVID-19) with a resolution of 0.1 nm. Confocal microscopy assists in neuroscience research, reconstructing neuronal synaptic connectivity networks in three dimensions.
2. Medical diagnosis
The pathology department uses oil microscopy to observe tissue sections (HE staining) to determine cancer staging, and fluorescence in situ hybridization (FISH) technology to locate chromosomal abnormalities. Intraoperative rapid pathological detection relies on portable microscopes to complete frozen section cancer cell screening within 10 minutes.
3. Biotechnology industry
Pharmaceutical companies use high-throughput microscopy to screen the effects of drugs on cells, such as tumor cell apoptosis rate; Observing the proliferation process of viruses in cultured cells during vaccine development. Modern agriculture uses microscopes to detect seed germ vitality or pathogen infection (such as counting spores of wheat Fusarium graminearum).
4. Educational Science Popularization
The middle school laboratory is equipped with a student microscope (40 × -400 ×) to observe the movement of onion epidermal cells or paramecium, and cultivate microscopic scientific thinking.
3、 Technology Trend: Intelligence and Multimodal Integration
In the future, microscopes will develop towards AI assisted analysis (automatic recognition of cell morphological abnormalities), super-resolution technology (STED microscopes that break through diffraction limits to 20nm), and multi omics applications (combined with mass spectrometry imaging to locate metabolite distribution), continuously expanding the boundaries of human exploration of the mysteries of life.