MEDICAL BOTANY - A.G. Serbin - 2003

INTRODUCTION

All life on Earth depends, directly or indirectly, on Photosynthesis—the ability of chlorophyll-containing plants, Algae, and certain Bacteria to capture solar energy and store it in organic molecules. Our planet is approximately 4.5 billion years old. Its primordial atmosphere is believed to have consisted primarily of gaseous nitrogen, a considerable amount of Water vapor, and carbon dioxide. In Earth's primitive, storm-swept atmosphere, gas molecules spontaneously combined to form larger, more complex molecules. Oxygen, which currently accounts for about 21% of the Earth's atmosphere, was virtually absent until photosynthetic organisms began producing it in large quantities. As a result, ultraviolet rays (which are now blocked by the ozone layer, an oxygen compound) reached the Earth's surface, facilitating the synthesis of new molecules and compounds. Four elements—carbon, hydrogen, nitrogen, and oxygen—account for about 98% of the mass of All living organisms.

The first forms to appear were heterotrophs—organisms that feed on Organic compounds or other organisms. The oldest known fossils date back 3.5 billion years. Autotrophic organisms, capable of synthesizing nutrients through photosynthesis, emerged no later than 3.4 billion years ago. Approximately 1.5 billion years ago, eukaryotes appeared, featuring larger and significantly more complex Cells compared to the existing prokaryotic bacteria.

The evolution of multicellular eukaryotes began no later than 650 million years ago, and some 450 million years ago they began to colonize the land.

Plants are primarily a terrestrial Lineage, representing one of the evolutionary groups comprising predominantly Multicellular Organisms. Fungi constitute another major group of organisms, absorbing nutrients through their entire bodies. Evolving from green algae, plants acquired a series of specific adaptations for terrestrial life. These are well-developed in members of the dominant group—vascular plants—and include a waxy cuticle pierced by specialized openings called Stomata, xylem that transports water and dissolved nutrients from the roots through the stems to the leaves, and phloem that distributes photosynthetic products to all PARTS OF THE plant. Increase in length occurs through primary growth, while increase in girth results from Secondary Growth; these processes are associated with zones of rapid Cell Division known as apical Meristems (apices).

Plant evolution was accompanied by the establishment of biomes—large terrestrial communities that also include animals. Interacting systems consisting of biomes and their surrounding abiotic environment are called ecosystems. Humans, who appeared about 2 million years ago, invented agriculture (at least 11,000 years ago) and consequently became the dominant ecological force on Earth. Humanity has harnessed plant knowledge for its own development and will continue to do so on an even greater scale in the future.

Living organisms, interconnected with each other and their environment through the cycling of matter and energy, are concentrated in the Earth's surface layers and the lower atmosphere. They form a nearly continuous and indivisible "film of life"—the biosphere. Disruption of the biosphere at any point impacts the overall state of all living things. While the biosphere possesses a capacity for self-recovery, this ability is impaired by harmful influences: the unwise use and exploitation of nature, the mindless pursuit of humanity's growing needs at nature's expense, The impact of technology, human intrusion into natural systems, artificial environmental modification, and much more.

An understanding of botany makes it easier to assess the critical environmental challenges of our time and contribute to building a healthier world.

Botany as a Modern Science

On the threshold of the third millennium, botany remains an exceptionally compelling field of knowledge, holding great promise for human health and welfare. Just over a century ago, botany was closely tied to medicine and practiced primarily by physicians. Today, it is a vital scientific discipline encompassing many specialized branches. Physiology studies plant Functions—how they absorb nutrients, acquire energy, grow, and develop. Morphology investigates the form of plant Organs and structures. Anatomy examines internal architecture: Cytology operates at THE CELLULAR LEVEL, and Histology at THE TISSUE LEVEL. Systematics, or Taxonomy, deals with the naming, Classification, and evolutionary relationships of plants. Plant ecology explores the Interactions Between Plants and their environment. Geobotany investigates the Structure, composition, development, and Distribution of plant communities in relation to environmental factors. Plant geography examines the patterns of global plant distribution. Paleobotany studies extinct and fossilized plants through impressions preserved in sedimentary rocks. Phycology focuses on algae, bryology on mosses, and so forth.

A major achievement of the 20th century was the emergence and Development of the concept of five Structural levels of biological Organization: molecular-genetic, cellular, organismal, population-species, and biospheric. The 21st century focuses on studying natural phenomena across all Levels of biological organization, viewing the interconnected links of The life cycle as a single whole. Uncovering the integration mechanisms of biosystems at all levels leads to a robust and comprehensive concept of life.

The advancement of biology in the 20th century led to its expanded application in agriculture, medicine, and environmental optimization. This era gave rise to biotechnology and Introduction/32.html">Genetic Engineering, alongside a vast array of new botanical disciplines and subfields: cell biology, space botany, medical botany, phytohormonology, immunology, developmental biology, radiology, radioecology, theoretical botany, noospherology, biospherology, and others.

Progress in botany during the second half of the 20th century was driven by The Development of Methods and techniques rooted in physics, chemistry, mathematics, and engineering. Electron Microscopy, X-Ray Diffraction Analysis, the radiotracer method, Chromatography, mass spectrometry, spectrophotometry, and tissue culture, among others, became widely employed.

According to Academician K.M. Sytnyk of the National Academy of Sciences of Ukraine, the Prospects for botany in the third millennium are as follows:

✵ photosynthesis and The production of food based on it will become feasible under artificial conditions;

✵ links will be established between macro- and microevolution, as well as between molecular and organismal biology;

✵ a new Code of Nomenclature for Living Organisms will come into use;

✵ advances in cellular engineering will enable the creation of ultra-high-yielding plants with high biological activity; methods for preserving plant species as valuable biotechnological material via cell cultures will be successfully implemented;

✵ the DEVELOPMENT OF MYCOLOGY branches such as medical, taxonomic, and biotechnological mycology will become a reality;

✵ the general theory of biodiversity will provide a reliable strategy for environmental conservation, consolidating rational, nature-friendly management practices, sustainable use of natural resources, and optimal protection regimes for plant cover. Concurrently, the impoverishment of phytobiont biodiversity will necessitate the search for preservation strategies to avert the threat of a planetary catastrophe.