Even though people have electron microscopy, their understanding of the microcosm is far from enough. There are still a lot of problems that urgently need to acquire a deeper understanding of the fine structure. Therefore, the exploration of the micro world is endless. Electronic engineers want to design circuit diagrams with a thickness of only a few tens of atoms; material scientists should examine defects at the atomic scale in the crystal; in the medical field, it is urgent to understand whether the structure of a single protein molecule or a single DNA molecule is normal or not. In the context of this huge driving force, a new tool for understanding the microcosm was born. In 1985 , a new type of microscope, Scanning Tunneling Microscopy (STM ) , was developed by IBM 's Binning and Kohrrer . STM came into being with a multi-disciplinary interest with its unique theory and application potential. It won the Nobel Prize in Physics in 1986 , and it was widely used in 1987. The first international STM conference was held in 1989 . In 1990 , the first time in China, STM was used to observe the helical structure of DNA strands (before the structural pattern of DNA was chemically deduced). STM has become an unprecedented leap in people's understanding of the microcosm, and in the medical field will inevitably bring about a new phase of understanding the atomic level.

The basic principle of STM is to use a tip-grinding very fine tungsten probe, which may only have a single atomic width ( 0.2 nm ). Through the piezoelectric control device, the probe tip is in the range of 1 - 2 nm on the surface of the specimen to be detected . Move inside. Since the probe is in close contact with the specimen, the electron cloud of the atom on the probe tip overlaps with the measured atomic electron cloud on the surface of the specimen. At this point, a small voltage is applied to the tip of the probe, and the flow of electrons tunnels through the gap between the tip and the specimen, creating a tiny tunneling current. Since the surface of any specimen is not completely planar, it is because the atomic structure of the surface of the specimen determines that it has a certain solid figure. The magnitude of the tunnel current intensity depends mainly on the distance between the probe and the specimen. If the distance is increased by 0.1 nm (that is, half of the atomic diameter), the tunneling current intensity is reduced by 90% . The change in the current of this tunnel is recorded and processed into a picture by computer processing, thus opening up the goal of direct observation of the atomic structure that people have been dreaming for for many years.

  When STM came out, the field of biomedicine was quickly applied to the observation of molecular structures. At present, the application of STM can not only describe the relationship between carbon and hydrogen atoms in amino acid molecules, but also directly observe the image of the DNA strand helix, the fine structure of the base pair, the diameter of the helix is 2 nm , and the base pair is ten bases 3- The 4nm long spiral repeat, etc., these exciting discoveries undoubtedly provide the necessary conditions for the clarification of the confused status in the key structure of life, and will be followed by a new revolutionary leap. Another example of the structure of IgG observation channels, STM can directly display the Y-shape, and two end Gab end and a hinge region of Fc, Fab end of the long 8-9nm, wide 5-7nm, Fc end of the long 12-14nm, width 6- At 7 nm , a small spherical structure was found at the Fab and Fc ends, and the globular structure may be the functional region of the antibody. This provides a unique and convenient way to reveal the essence of the immune response mechanism. There are also new observations on cell membranes and plasma membranes.

Although STM has been published for only 5 years, its great potential for biomedical applications has been clearly demonstrated in our eyes. The exploration of human diseases has been carried out from the level of macroscopic observation to the level of cells observed by optical microscopy to the observation of electron microscopy. In the course of the development of the micro-structural level, although every step forward has brought about a leap, the threat of disease facing us humans is far from achieving the ideal level of conquest. There are still a large number of clinical problems that have not been solved, and the resolution of these problems is far from the existing cognitive ability, and it is necessary to explore the deeper microcosm. Therefore, the wide application of STM allows us to enter the atomic level of disease. In the understanding, the application of this key to the micro-world and the opening of the mysterious door of disease are getting closer and closer to us.

Medical Elastic Bandages

ELASTIC BANDAGE

Structure and composition: It is woven by chemical fiber and yarn in plain weave.

Product performance: Non-toxic, medical usage and environmentally friendly, using special and unique technology, through multiple processes. So that the mesh and elasticity of the product are always uniform, and the permeability is good.

Model specifications: Plain weave. The specification width is 5CM / 7.5CM / 10CM / 12CM / 15CM / 20CM, and the length is any fixed length between 3-20M.

Packing: Each roll packed with OPP candy paper, the outer layer is 5-layer double corrugated kraft paper box.

Gauze Bandage,Medical Bandage,Elastic Bandage,Medical Elastic Bandages

Shaoxing Gangfeng Hospital Products Co.,Ltd. , https://www.gangfenggauze.com