MICROBIOLOGY - M.H. Serhiichuk - 2008

Introduction

Microbiology (from Greek mikros meaning small, bios life, and logos science) is the branch of science that investigates the systematics, Morphology, ultrastructure, physiology, biochemistry, genetics, and ecology of microorganisms, as well as their distribution in nature, their role in biogeochemical cycles, human, animal, and plant pathologies, and explores their vital activity and potential Applications for the benefit of humanity.

Generally speaking, microorganisms are biological entities whose dimensions lie beyond the limits of human visual resolution. They are predominantly unicellular organisms visible only under a Microscope. They are found in soil, Water, and air, On the surface and within the bodies of humans, animals, and plants, in the ice of Antarctica, at the bottom of seas and oceans, in the depths of mines, and in geysers.

The timeline of their existence dates back to the very dawn of life on our planet. Perhaps for this reason, it is impossible to separate the cycling of substances in nature from the vital activity of microorganisms. They drive the Mineralization of organic residues and the synthesis of complex compounds. Peat, coal, and crude oil are likewise products of microbial activity.

Microorganisms are increasingly valued as a Source of Enzymes, Vitamins, Amino acids, Antibiotics, and other BIOLOGICALLY ACTIVE SUBSTANCES essential to human life.

Soil is the most densely populated habitat for microorganisms. Investigations into soil microflora and biochemistry have clarified the patterns of pedogenesis and soil fertility formation, while also improving tillage, land reclamation, and remediation practices. The Study of soil microorganisms has led to The Development of numerous bacterial inoculants that help enhance crop yields. Further exploration of soil microflora and microbiological processes remains a key pathway for advancing agricultural systems and refining agrotechnical measures aimed at boosting soil productivity and crop yields.

Microbiological research is no less vital for another sector of agriculture—animal husbandry. Feed ensiling and The production of valuable feed supplements (such as the Synthesis of the essential amino acid Lysine from cheap raw Materials to enrich animal feed) are likewise grounded in the achievements of microbiology.

A special role in solving applied problems belongs to industrial microbiology (biotechnology), which is based on harnessing the biological activity of microorganisms. To address these challenges using Introduction/32.html">Genetic Engineering techniques, recombinant microbial strains are engineered, enabling the production of such medically relevant bacterial products as Insulin, somatotropin, interferons, and others.

Microorganisms are utilized in geology as indicators during mineral exploration. Scientists also study their role in the weathering of certain rocks and The formation of others.

Alongside beneficial microorganisms, there are pathogenic microbes—the causative agents of diseases in humans, animals, plants, and insects. They can trigger epidemics of infectious diseases that periodically sweep across many countries. In the 19th century, wars claimed the lives of about 19 million people worldwide, whereas tuberculosis alone accounted for 35 million deaths. During the 1918–1920 Influenza (Spanish flu) pandemic, over 500 million people fell ill, and approximately 15 million died.

Given the profound role that microorganisms play in nature and human life, the objectives of microbiology are multifaceted and cannot be accomplished within the bounds of a single scientific discipline or by specialists from just one field. Consequently, microbiology has differentiated into a range of sub-disciplines that study microorganisms in specific contexts relative to their role in nature, medicine, veterinary science, or their potential applications in economic activity.

General microbiology encompasses knowledge of the systematics, morphology, physiology, chemical composition, Structure, and biochemical properties of microorganisms, their role in biogeochemical cycles, distribution in nature, and the specific Organization and Replication of their genetic apparatus.

Medical and veterinary microbiology investigates the biology of microbes pathogenic to humans and animals, and develops Methods for the Prevention and Treatment of infectious diseases.

Agricultural microbiology examines The Role of microorganisms in soil fertility and methods for its enhancement, plant-pathogenic microorganisms

and Methods of Plant protection against infection, the participation of microorganisms in global nutrient cycles, and The Use of microbes to combat agricultural pests.

Aquatic microbiology explores microbial colonization of water bodies and their role in nutrient cycling, and develops microbiological methods for the treatment of domestic and industrial wastewater.

Geological microbiology studies the role of Microorganisms in the cycling of abiogenic elements and the formation of mineral deposits, and develops methods for extracting metals from ores.

Technical microbiology develops and introduces into production new microbial strains for the synthesis of amino acids, protein supplements, microbial fertilizers, and biologically active substances (antibiotics, vitamins, and enzyme preparations). Technical microbiology also devises technologies for the Production of organic acids, alcohol, wine, beer, lactic acid products, and cheeses, as well as methods to prevent metal corrosion and protect building materials and foodstuffs from microbial damage.

Space microbiology investigates the effects of cosmic conditions on microorganisms, the potential presence of microbial life on other planets, and methods to prevent the introduction of terrestrial microorganisms onto them and, conversely, the contamination of Earth by extraterrestrial microorganisms.

This textbook is a collaborative work by the faculty members of the Department of Microbiology and General Immunology, on The basis of which the first study guide, «Общая микробиология» (General Microbiology), was published in 1988 (by A.Yu. Vershyhora, L.H. Brantsevych, I.O. Vasylevska, L.M. Lysenko, N.D. Mikhnovska, Ye.U. Paster, and I.I. Shevtsova). The authors of the textbook have drawn upon the finest achievements of their mentors, supplementing them with up-to-date data on microbiology compiled from monographs, research papers, literature reviews, and foreign textbooks of recent years.

We hope that this textbook will help students successfully master the fundamentals of microbiology and prove useful to a wide range of biologists researching microbiological problems. The authors will be grateful for any feedback and suggestions.