Introduction Microscopy helps us to understand or gives access to see the direct images of various tissues, organisms, organelles, microorganisms, molecular assemblies, and proteins. It is an important, complementary technique to visualize the macro and/or microscopic structure and to assign structure to function and vice versa. The discovery of an electron microscope was not sudden, […]
Electron microscope: Definition and types Read More »
Introduction A microscope is used to see objects that are not visible to the naked eye. The electron microscope is a breakthrough invention in microbiology. It is of two types based on its structure such as transmission electron microscope and Scanning electron microscope (SEM). This microscope accurately describes the smallest part of an object. After
Scanning electron microscope (SEM): Structure and description Read More »
Introduction Microorganisms are categorized under bacteria, viruses, fungi, and mycoplasma. Some of the microorganisms are disease-causing some are saprophytes or some are heterotopic in nature. Bacteria are cosmopolitan, unicellular, rigid cell-walled, prokaryotic microorganisms. They are simple in structure cause diseases in plants and animals. The following article is about gram-positive and gram-negative bacteria and their
Gram-positive and Gram-negative bacteria: Difference Read More »
Introduction Are viruses living or not? is a very difficult question to understand. The virus has attributes of both living organisms and nonliving objects. Thus it can be considered as both living and nonliving Origin of Virus There are two main views on the origin of the virus A. I. Oparin suggested that complex molecules of
Are viruses living or not? Origin and properties Read More »
Difference between animal, plant virus, and bacteriophage Viruses are very small even smaller than bacteria and are mainly parasitic in nature. Depending upon the host, they are widely categorized under three different types namely animal, plant viruses, and bacteriophage. Although all of them have basic similarities depending on the host type and genetic material these
Virus difference: animal, plant, & bacteriophage Read More »
Introduction There is no nomenclature system for virus classification since they are not considered truly living. As we all know living organisms have a definite cellular structure. That raises an interesting question of what actually viruses are. And what are the types of viruses and their structure? Viruses are named according to the type of
Types of viruses: structure, classification and reproduction Read More »
Virus definition In Latin, the word virus means poisonous or venomous fluid coined by Dmitri Ivanowsky (1892). He recognized certain microbes causing mosaic diseases of tobacco are smaller than that of bacteria. These are very very minute submicroscopic biological entities. Thus, definition for viruses is that it does not have any cellular organelles but definitely
Types and simple definition for viruses and structure Read More »
