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Author: DrChika

Dr. Chika Ejikeugwu (Ph.D., 2017, UNIZIK, Nigeria) is a distinguished microbiologist, researcher, and educator with an impressive international profile. He is a Fellow of the renowned Alexander von Humboldt (AvH) Stiftung in Germany and currently holds a Research Fellowship at the Helmholtz Centre for Environmental Research (UFZ) in Leipzig, Germany. His ongoing research within the soilRESIST project investigates the effects of antibiotic mixtures on soil microbiomes, addressing critical challenges in antimicrobial resistance (AMR) and environmental microbiology. Dr. Ejikeugwu is the visionary founder and developer of Africa's leading microbiology platform, www.MicrobiologyClass.net, a widely recognized and trusted knowledge hub that supports students, professionals, and researchers across the continent and beyond. This platform has become a cornerstone in advancing microbiology education and research in Africa. Throughout his career, Dr. Ejikeugwu has held prestigious research positions globally. He was awarded the prestigious Alexander von Humboldt (AvH) Fellowship for Experienced Researchers in 2023 and is currently conducting research on AMR in soil ecosystems at the Helmholtz Centre for Environmental Research (UFZ) in Leipzig, Germany, as a Senior Humboldt Research Fellow. Previously, he held a DAAD Postdoctoral Fellowship at the Federal Institute for Materials Research and Testing (BAM) in Berlin, Germany, in 2021, and a MIF Postdoctoral Fellowship at Kyoto University, Kyoto, Japan, in 2018. His groundbreaking work in antimicrobial resistance (AMR) earned him the esteemed Young Investigator Award on AMR from Institut Mérieux, France, in 2021. Additionally, he is a recipient of the NIH CAMRA grant for AMR research, with his project focusing on antimicrobial resistance in poultry environments. Dr. Ejikeugwu is a dynamic member of the Global Young Academy (GYA), Germany, and holds memberships in several prominent professional organizations, including Applied Microbiology International (AMI), the European Society of Clinical Microbiology and Infectious Diseases (ESCMID), the Nigerian Society for Microbiology (NSM), and the American Society for Microbiology (ASM). He earned his doctorate in Pharmaceutical Microbiology and Biotechnology and serves as a Senior Lecturer and Researcher at Enugu State University of Science and Technology (ESUT), Nigeria. In this role, he is deeply committed to mentoring undergraduate and postgraduate students, fostering their academic development, and nurturing the next generation of microbiologists. Driven by a passion for teaching, cutting-edge research, and community development, Dr. Ejikeugwu continues to make significant contributions to the global microbiology landscape.
  • Home
  • DrChika
  • Page 11
FERDINAND J. COHN (1828-1898)
  • General Microbiology

FERDINAND J. COHN (1828-1898)

  • DrChika
  • December 25, 2022

Ferdinand Cohn, a German biologist was born in Breslau (now in Poland). Cohn was the […]

EDWARD JENNER (1749-1823)
  • General Microbiology

EDWARD JENNER (1749-1823)

  • DrChika
  • December 25, 2022

Edward Jenner was the pioneer of the dreaded smallpox vaccination and also the father of […]

LOUIS PASTEUR (1822-1895)
  • General Microbiology

LOUIS PASTEUR (1822-1895)

  • DrChika
  • December 25, 2022

Louis Pasteur, a French scientist was the first to report the role of microorganisms in […]

JOHN TYNDALL (1820-1883)
  • General Microbiology

JOHN TYNDALL (1820-1883)

  • DrChika
  • December 25, 2022

One of the traditional arguments against abiogenesis was the claim that the heat used to […]

ALEXANDER FLEMMING (1881-1955)
  • General Microbiology

ALEXANDER FLEMMING (1881-1955)

  • DrChika
  • December 25, 2022

Alexander Flemming, a Scottish born physician who spent most of his time studying bacteria discovered […]

AVERY OSWALD (1877-1955)
  • General Microbiology

AVERY OSWALD (1877-1955)

  • DrChika
  • December 25, 2022

Avery Oswald was a Canadian-born American physician and medical researcher who provided the molecular explanation […]

HANS CHRISTIAN JOACHIM GRAM (1853-1938)
  • General Microbiology

HANS CHRISTIAN JOACHIM GRAM (1853-1938)

  • DrChika
  • December 25, 2022

Hans Gram developed a microbiological technique which is still used today in clinical microbiology practice […]

ROBERT HOOKE (1635-1703)
  • General Microbiology

ROBERT HOOKE (1635-1703)

  • DrChika
  • December 25, 2022

Robert Hooke was the first scientist to study and record living cells using the microscope. […]

JOHN NEEDHAM (1713-1781)
  • General Microbiology

JOHN NEEDHAM (1713-1781)

  • DrChika
  • December 25, 2022

John Needham is the English scientist who performed experiments on spontaneous generation or abiogenesis in […]

ANTHONY VAN LEEUWENHOEK (1632-1723)
  • General Microbiology

ANTHONY VAN LEEUWENHOEK (1632-1723)

  • DrChika
  • December 25, 2022

Anthony Van Leeuwenhoek was a Dutch scientist and tradesman who did a part time job […]

ROBERT KOCH (1843-1910)
  • General Microbiology

ROBERT KOCH (1843-1910)

  • DrChika
  • December 25, 2022

Robert Koch, a German scientist was the first medical microbiologist. Koch was also the first […]

Historical Perspectives of Microbiology
  • General Microbiology

Historical Perspectives of Microbiology

  • DrChika
  • December 25, 2022

Microbiology as a field in the biological sciences saw the light of the day because […]

SIGNIFICANCE OF BIODETERIORATION/BIODEGRADATION
  • Environmental & Soil Microbiology

SIGNIFICANCE OF BIODETERIORATION/BIODEGRADATION

  • DrChika
  • December 24, 2022

Microorganisms are ubiquitous and they play several roles in the degradation of recalcitrant organic and […]

MICROBIAL DISEASES TRANSMISSIBLE THROUGH THE SOIL
  • Environmental & Soil Microbiology

MICROBIAL DISEASES TRANSMISSIBLE THROUGH THE SOIL

  • DrChika
  • December 24, 2022

Microorganisms are ubiquitous and are thus found everywhere including the soil. The soil no doubt […]

HOST-PARASITE RELATIONSHIPS (MICROBIAL ASSOCIATIONS)
  • Environmental & Soil Microbiology

HOST-PARASITE RELATIONSHIPS (MICROBIAL ASSOCIATIONS)

  • DrChika
  • December 24, 2022

A host-parasite relationship is an association that exists between two organisms known as the host […]

Environmental Microbiology
  • Environmental & Soil Microbiology

Environmental Microbiology

  • DrChika
  • December 24, 2022

Environmental microbiology is the study of microbial processes in the environment, microbial communities and microbial […]

OUTPUT OF ANTIMICROBIAL DRUG SUSCEPTIBILITY TESTING
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Microbe Lab

OUTPUT OF ANTIMICROBIAL DRUG SUSCEPTIBILITY TESTING

  • DrChika
  • December 24, 2022

The output of an antimicrobial drug susceptibility test is often expressed as raw data which […]

Overview of antimicrobial susceptibility testing (AST) / Antibiogram
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Microbe Lab

Overview of antimicrobial susceptibility testing (AST) / Antibiogram

  • DrChika
  • December 24, 2022

When a pathogenic microorganism is isolated from the specimen of a patient, the clinical microbiology […]

CEPHALOSPORINS
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

CEPHALOSPORINS

  • DrChika
  • December 24, 2022

Cephalosporins are beta-lactam antibiotics that are penicillinase-resistant, and with related mode of action to the […]

PENICILLINS
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

PENICILLINS

  • DrChika
  • December 24, 2022

Penicillins are beta-lactam drugs that inhibit the cross-linking of N-acetyl glucosamine (NAG) and N-acetyl muramic […]

CLASSIFICATION OF ANTIBIOTICS BASED ON SPECTRUM AND MECHANISM OF ACTION
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

CLASSIFICATION OF ANTIBIOTICS BASED ON SPECTRUM AND MECHANISM OF ACTION

  • DrChika
  • December 24, 2022

Antibiotics can also be classified into different categories depending on their mode of action and/or […]

ANTIBACTERIAL AGENTS
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

ANTIBACTERIAL AGENTS

  • DrChika
  • December 24, 2022

Antibacterial agents are specifically chemical agents that kill or inhibit the growth of pathogenic bacteria. […]

SPECTRUM OF ACTIVITY OF ANTIMICROBIAL AGENTS
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

SPECTRUM OF ACTIVITY OF ANTIMICROBIAL AGENTS

  • DrChika
  • December 24, 2022

The growth of pathogenic microorganisms is usually accompanied by the synthesis of new molecules including […]

Overview of antimicrobial agents (antibiotics)
  • Antimicrobial Agents & Antibiotics
  • Pharmaceutical Microbiology

Overview of antimicrobial agents (antibiotics)

  • DrChika
  • December 24, 2022

Ever since their discovery some decadesago, antimicrobial agents particularly antibiotics have saved mankind from the […]

Eugon LT SUP Medium
  • Culture media
  • Environmental & Soil Microbiology

Eugon LT SUP Medium

  • DrChika
  • December 22, 2022

Eugon LT Sup is a nutritious (broth) medium for detecting and enumerating microorganisms in cosmetics. […]

Buffered Charcoal Yeast Extract (BCYE) Agar
  • Culture media
  • Medical Microbiology

Buffered Charcoal Yeast Extract (BCYE) Agar

  • DrChika
  • December 22, 2022

Buffered Charcoal Yeast Extract (BCYE) Agar is used for primary isolation and cultivation of Legionella pneumophila […]

Chromogenic culture media for detecting antimicrobial resistance mechanisms
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Culture media
  • Microbe Lab
  • Pharmaceutical Microbiology

Chromogenic culture media for detecting antimicrobial resistance mechanisms

  • DrChika
  • December 22, 2022

Chromatic Super CAZ/AVI Chromogenic medium for detecting Ceftazidime-avibactam resistant Gram-negative bacteria. Chromatic Super CAZ/AVI is […]

CLASSES OF ANTIBIOTICS
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

CLASSES OF ANTIBIOTICS

  • DrChika
  • December 21, 2022

There are several classification/types of antibiotics today, which is based on bacterial spectrum of activity […]

SOURCES OF ANTIBIOTICS
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

SOURCES OF ANTIBIOTICS

  • DrChika
  • December 21, 2022

Before the advent of conventional medicine used in clinical medicine today for the treatment of […]

BRIEF HISTORY OF ANTIBIOTICS
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

BRIEF HISTORY OF ANTIBIOTICS

  • DrChika
  • December 21, 2022

Antibiotic history dates back to 1928 when Sir Alexander Fleming discovered the antibacterial effects of […]

DEFINITION OF AN ANTIBIOTIC
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram
  • Pharmaceutical Microbiology

DEFINITION OF AN ANTIBIOTIC

  • DrChika
  • December 21, 2022

There is no consensus to the definition of antibiotics. But it is very important that […]

Introduction to Antibiotic Resistance
  • Pharmaceutical Microbiology
  • Antibiotic Resistance / Antimicrobial Resistance (AMR)
  • Antimicrobial Agents & Antibiotics
  • Antimicrobial Susceptibility Testing (AST) & Antibiogram

Introduction to Antibiotic Resistance

  • DrChika
  • December 21, 2022

In recent times, antibiotic resistance of pathogens to drugs (antibiotics) directed towards the degrading properties […]

GEL ELECTROPHORESIS TECHNIQUE
  • Biotechnology
  • Molecular Microbiology

GEL ELECTROPHORESIS TECHNIQUE

  • DrChika
  • December 21, 2022

The term “electrophoresis” refers to the movement of a solid particle (e.g. nucleic acids) through […]

Introduction to Recombinant DNA (rDNA) Technology / Genetic Engineering
  • Biotechnology
  • Molecular Microbiology

Introduction to Recombinant DNA (rDNA) Technology / Genetic Engineering

  • DrChika
  • December 21, 2022

Recombinant DNA (rDNA) technology or genetic engineering is the in vitro controlled manipulation of nucleic […]

Introduction to Parasitology
  • Public Health & Parasitology

Introduction to Parasitology

  • DrChika
  • December 20, 2022

Parasitology is the study of parasites and their interaction with other organisms (i.e. their hosts). […]

PUBLIC HEALTH AND PARASITIC DISEASES
  • Medical Microbiology
  • Public Health & Parasitology

PUBLIC HEALTH AND PARASITIC DISEASES

  • DrChika
  • December 20, 2022

Public health is a branch of medical sciences that primarily deals with the surveillance, control, […]

STERILITY TESTS OF BIOLOGICAL PRODUCTS
  • Food Microbiology
  • Pharmaceutical Microbiology

STERILITY TESTS OF BIOLOGICAL PRODUCTS

  • DrChika
  • December 20, 2022

The phrase sterility simply means the absence of living organisms including bacteria, fungi, viruses, protozoa […]

Introduction to Pharmaceutical Microbiology
  • Pharmaceutical Microbiology

Introduction to Pharmaceutical Microbiology

  • DrChika
  • December 20, 2022

Pharmaceutical microbiology is the branch of microbiology that focuses on all aspects of pharmacy especially […]

PHYSIOCHEMICAL ENVIRONMENTAL FACTORS THAT AFFECT CELL CULTURE
  • Cell Culture Notes

PHYSIOCHEMICAL ENVIRONMENTAL FACTORS THAT AFFECT CELL CULTURE

  • DrChika
  • December 20, 2022

Cell or tissue culture experimentations should not be carried out in the regular laboratory space […]

Introduction to Cell Culture
  • Cell Culture Notes

Introduction to Cell Culture

  • DrChika
  • December 20, 2022

Cell culture is the laboratory technique of growing and maintaining the cells of multicellular organisms […]

BRIEF HISTORY OF EPIDEMIOLOGY
  • Epidemiology

BRIEF HISTORY OF EPIDEMIOLOGY

  • DrChika
  • December 19, 2022

The search for the ravaging scourge of some infectious diseases including cholera, typhoid fever, small […]

Introduction to Epidemiology
  • Epidemiology

Introduction to Epidemiology

  • DrChika
  • December 19, 2022

The word epidemiology was coined from three different Greek words: epi (upon or on), demos […]

Introduction to Microbiology of Oral Infection
  • Microbiology of Oral Infection

Introduction to Microbiology of Oral Infection

  • DrChika
  • December 19, 2022

The first investigation into the world of oral bacteria was first made by the father […]

ARCHAEA, EUBACTERIA and BACTERIA
  • Microbial Taxonomy

ARCHAEA, EUBACTERIA and BACTERIA

  • DrChika
  • December 19, 2022

Archaea bacteria generally inhabit terrestrial and aquatic environments where the condition of living is extremely […]

MICROBIAL DIVERSITY: Archaea, Eubacteria, Bacteria
  • Microbial Taxonomy

MICROBIAL DIVERSITY: Archaea, Eubacteria, Bacteria

  • DrChika
  • December 19, 2022

The phylogenetic tree of life comprises mainly of Eubacteria, Archaea and Bacteria. Eubacteria or Eukarya, […]

TAXONOMIC GROUPS OF MICROORGANISMS
  • Microbial Taxonomy

TAXONOMIC GROUPS OF MICROORGANISMS

  • DrChika
  • December 19, 2022

There are millions of microorganisms in the face of the planet earth, and these organisms […]

CATEGORIES OF TAXONOMY: identification, classification, nomenclature
  • Microbial Taxonomy

CATEGORIES OF TAXONOMY: identification, classification, nomenclature

  • DrChika
  • December 19, 2022

Taxonomy, which is the science of biological classification, is divided into 3 main interconnected parts […]

Introduction to Microbial Taxonomy
  • Microbial Taxonomy

Introduction to Microbial Taxonomy

  • DrChika
  • December 19, 2022

Taxonomy can be defined as the scientific system of classifying biological organisms into taxa (singular: […]

LIST OF SOME BACTERIA OF MEDICAL IMPORTANCE AND THEIR FEATURES
  • Bacteriology

LIST OF SOME BACTERIA OF MEDICAL IMPORTANCE AND THEIR FEATURES

  • DrChika
  • December 19, 2022

Bacillus cereus Gram-positive rods Motile organism Forms endospores Colonies are non-haemolytic on blood agar Aerobic […]

INTRODUCTION TO BACTERIOLOGY LAB
  • Bacteriology

INTRODUCTION TO BACTERIOLOGY LAB

  • DrChika
  • December 19, 2022

Bacteriology is simply defined as the scientific study of bacteria. Pathogenic bacteriology thus, is the […]

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