Cell Biology
The field of ultra-structure of the chromatin is still the area where electron microscope had failed to provide us a clear picture of the organization of DNA in the chromatin. For the study of chromosomes with the help of electron microscope, whole chromosome mounts as well as sections of chromosomes were studied. Such studies had [...]
Nicotine is one or the most addictive substances known. The reason for this is still unclear. The muscle weakness that new smokers experience is due to nicotine binding lo and blocking receptors on the muscle cells, but we are still not sure how nicotine acts in the brain to cause a pleasurable experience. The fly [...]
Continue reading about Medical importance of Cigarettes, Mushrooms, Insecticides
Chromosome number The number of the chromosomes is constant for a particular species. Therefore, these are of great importance in the determination of the phylogeny and taxonomy of the species. The number or set of the chromosomes of the gametic cells such as sperms ad ova is known as the gametic, reduced or haploid sets [...]
Fluorescent molecules emit light when they are illuminated with light of a shorter wavelength. Familiar examples are the hidden signature in bank passbooks, which is written in fluorescent ink that glows blue (wavelength about 450 nm) when illuminated with ultraviolet light (UV) (wavelength about 360 nm), and the whitener in fabric detergents that causes your [...]
The most commonly used type of electron microscope in biology is called the transmission electron microscope because electrons arc transmitted through the specimen to the observer. The transmission electron microscope has essentially the same design as a light microscope, but the lenses, rather than being glass, are electromagnets that bend beams of electrons. An electron [...]
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