BIOE 201 Notes

What is Bioengineering?

  • Application of Biology, Physics, Mathematics and Engineering to define and solve problems in:

    • biology, medicine, food industry, agriculture and environment

    • petroleum industry, clean energy production, and many others

  • Emphasizes real-world problem solving at the intersection of life sciences and engineering

Course Focus: BIOE 201 and Related Courses

  • BIOE 201 emphasizes Biology (fundamentals) with engineering applications

  • Other courses emphasize Engineering with applications in Biology

  • Various courses in the BIOE BSc program build on this interdisciplinary foundation

Inquiry-Based Learning (IBL) and Definition of Biology

  • Discussion prompt: How can we define Biology?

  • Encourages inquiry-based learning to develop understanding through exploration and questioning

Introduction to Biology: Definition and Scope

  • Biology defined as the science of life

  • Studies life in any environment: land, soil, sea, atmosphere, air, water, rocks, etc.

  • Includes life in living organisms themselves (animals, trees, humans, etc.)

  • Scope covers all living organisms from viruses and bacteria to elephants and humans

  • Biology encompasses the study of life as a whole and the biology of individual organisms

Biology-Related Disciplines and Cross-Fields

  • Related fields include: Bioengineering, Bioinformatics, Biomathematics, Biophysics, Biotechnology, Biochemistry, Pathology, Pharmacology, Toxicology, Epidemiology, Physiology, Medicine, Microbiology, Virology, Entomology, Parasitology

  • Agricultural subfields: Phytopathology, Ichthyology

  • Core objective: understand the complexity of biology and its interactions with engineering, physics, and mathematics

  • Mentions the concept of Exo-biology (life on other planets or planetary systems)

Biology Disciplines (Expanded List)

  • MICROBIOLOGY

  • ZOOLOGY

  • BOTANY

  • ANTHROPOLOGY

  • BIOCOENOSIS

  • POPULATION

  • ORGANISM

  • CELL

  • BIO-MOLECULE

  • TAXONOMY

  • EVOLUTION

  • ECOLOGY

  • ETHOLOGY

  • GENETICS

  • PHYSIOLOGY

  • ANATOMY

  • HISTOLOGY

  • CYSTOLOGY

  • MOL BIOLOGY

Complexity of Biology (II)

  • Existence of millions of species: from microscopic organisms (bacteria, parasites, fungi) to larger life forms (fish, trees, large animals like humans, sharks, elephants)

  • Estimated historical diversity: ~100 billion species have existed since life began; only ~100 million may exist now

    • Approximate ratio: rac{10^{8}}{10^{11}} = 10^{-3} = 0.001 ext{ (fraction)} = 0.1 ext{%}

    • Note: the slide states 0.001% which mathematically would be 0.00001; the ratio above clarifies the typical interpretation as 0.1%. This discrepancy is worth noting when studying historical figures.

  • Core objective of BIOE 201: understand these fundamentals despite species diversity

Course Objectives

  • Learn basic concepts of biology as per the course outline and textbook

  • Apply biological concepts in engineering contexts

  • Develop understanding of some diseases

Basics and Fundamentals of Life: The Cell and Metabolism

  • Cell: the smallest unit of life

    • Made of chemical molecules (simple and complex)

    • Contains organelles and substructures

    • Metabolism: the sum of chemical reactions that constitute survival and reproduction

    • A cell can live and reproduce on its own if nutrients are adequate and the environment is suitable

  • Atom: the smallest building block of matter

  • Molecules: atoms joined by chemical bonds

  • Cell: the smallest structural and functional unit of life capable of living and reproducing

Discussion: Distinguishing Cell Types

  • Two main cell types exist: Eukaryotes and Prokaryotes

  • Key differentiator: presence of a nucleus

Eukaryotes vs Prokaryotes

  • Eukaryotes: have true nucleus (DNA enclosed in a nuclear membrane)

  • Prokaryotes: no nucleus; DNA located in the cytoplasm or nucleoid region

  • For schematic context:

    • Eukaryote features: nucleus, membrane-bound organelles (e.g., mitochondria, endoplasmic reticulum, Golgi), larger size and more complex structure

    • Prokaryote features: nucleoid region, simple internal organization, often a cell wall and capsule, flagella for movement

Organismal Complexity: Eukaryotes and Prokaryotes (Illustrative comparisons)

  • Eukaryote components include: Mitochondria, Nucleus, Endoplasmic Reticulum, Rough ER, Golgi, Ribosomes

  • Prokaryote components include: Nucleoid where DNA resides, Ribosomes, Capsule, Cell Wall, Cell Membrane, Flagellum

  • Conclusion: Eukaryotes are more evolved and complex than Prokaryotes

Organism: Definition and Examples

  • Organism: a complete living creature

  • Discussion prompts:

    • Cite some organisms

    • Organisms are categorized into two groups: Unicellular and Multicellular

Unicellular vs Multicellular Organisms

  • Unicellular: single cell (examples include Bacteria, Archaea, and many Protists)

  • Multicellular: composed of many cells (plants, animals, humans)

  • Parallels: Protists include unicellular and simple multicellular forms; higher plants and animals are multicellular and more specialized

  • Transition: Evolution from unicellular to multicellular life involved specialization and coordination among cells

Life's Levels of Organization

  • Objects and components exist at multiple levels assembled from common parts

The Three Domains of Life

  • Bacteria: single-celled prokaryotes; ancient lineage

  • Archaea: single-celled prokaryotes; evolutionarily closer to eukaryotes

  • Eukarya: eukaryotic cells; include single-celled and multicellular species

  • Visual cue: figure showing diversity across the three domains

Under Eukarya: Major Groups

  • Protists: simplest eukaryotes; mono- or multi-cellular (e.g., Trypanosomes, malaria parasites, seaweeds)

  • Fungi: unicellular or multicellular; decomposers; secrete enzymes outside the body to digest and absorb nutrients

  • Plants: multicellular, photosynthetic; roots, stems, leaves; primary producers in terrestrial ecosystems

  • Animals: multicellular consumers that ingest tissues or fluids of other organisms

Representatives of Life's Diversity (Examples)

  • Bacteria: diverse representatives (e.g., E. coli, dental plaque bacteria, Lactobacillus in yogurt)

  • Archaea: resemble bacteria but genetically closer to eukaryotes; isolated from extreme environments (e.g., hydrothermal vents)

  • Protists: diverse eukaryotes including giant seaweeds and microscopic single cells

Fungi, Plants, and Animals (Additional Notes)

  • Fungi: eukaryotic, mostly multicellular, decomposers; secrete extracellular enzymes

  • Plants: multicellular, photosynthetic; primary producers

  • Animals: multicellular, ingestive; mobile and diverse roles

Taxonomy: Naming and Classifying Species

  • Each organism has a unique scientific name constructed from two parts: genus and species epithet

  • Taxonomy is the system of naming and classifying species

  • Ranking from broad to specific: Domain → Kingdom → Phylum → Class → Order → Family → Genus → Species

  • Linnaean taxonomy (Carl Linnaeus): traditional hierarchical system

  • Note on naming: the species name is written in italics; genus and specific epithet can appear separately in other organisms, but the two together are unique

Examples of Scientific Names (Taxonomic Practice)

  • Malus domestica (common apple) – note the commonly used binomial form is Malus domestica; the slide uses Malus domisticus (likely a typographical variant)

  • Daucus carota (carrot)

  • Daucus pusillus (small carrot)

  • Homo sapiens (human)

  • Homo heidelbergensis, Homo neanderthalensis, Homo (other species)

Levels of Organization (Expanded)

  • Atom → Molecules → Cell

  • Prokaryotes (single-celled) vs Eukaryotes (multicelled organisms in many cases)

  • Tissue: group of cells performing a specific task

  • Organ: group of tissues performing one or more tasks

  • Organ system: group of organs functioning together for a major task

  • Example: Digestive system – organs include salivary glands, liver, stomach, intestines

  • Roles vary: organ-level function focuses on specific tasks like breakdown and absorption of nutrients

Population, Community, Ecosystem, Biosphere

  • POPULATION: group of individuals of the same species in a given area (e.g., Acacia trees)

  • COMMUNITY: array of populations of different species living together in a specified area

  • ECOSYSTEM: community interacting with its physical environment (soil, water, climate, chemicals)

  • BIOSPHERE: sum of all ecosystems on Earth; includes lithosphere, atmosphere, and hydrosphere

Life’s Unity and Interdependence

  • Producers (plants): convert sunlight into chemical energy via photosynthesis

  • Consumers (animals): obtain energy by feeding on other organisms

  • Nutrient cycling vs. energy flow: nutrients recycle through ecosystems, while energy flows from the sun and is eventually dissipated as heat

Evolution, Diversity, and Adaptation

  • Diversity and adaptation underlie evolution

  • Mutations produce genetic variation; those with advantageous traits reproduce more, increasing their representation in the population

  • Natural selection: “survival of the fittest” leads to allele frequency changes over generations

  • Example: Peppered moths illustrate change in pigment frequencies due to environmental changes (pre-industrial light bark favored light moths; post-industrial soot darkened trees favoring dark moths)

  • Conclusion: Evolution by natural selection drives population-level changes over time

Homeostasis and Response to Change

  • Homeostasis: maintenance of internal conditions within tolerable ranges

  • Organisms regulate body fluid composition, temperature, and other stable conditions

  • Stimulus and response: organisms sense and respond to internal and external changes to maintain homeostasis

Scientific Thinking, Methods, and Critical Thinking

  • Critical thinking: evaluate the quality of information using evidence, not opinion

  • Science aims to understand the observable world and how it works

  • Hypothesis: a testable and falsifiable explanation of a natural phenomenon

  • Scientific experiences should be open to challenge, repeatable, and reproducible

  • Use of standard language, references, and methodologies in research

  • Experiments are designed to support or reject hypotheses

Inductive vs Deductive Reasoning

  • Inductive reasoning (Bottom-up): start with data/observations, form a hypothesis or theory, test via experiments

  • Deductive reasoning (Top-down): start with experimental data to form or test a theory/hypothesis

The Scientific Method (Inductive Reasoning) with Examples

  • Observation: People who smoke have high lung cancer incidence

  • Question: Does smoking cause cancer?

  • Testing: Compare cancer incidence in smokers vs non-smokers while keeping other parameters constant

  • Prediction: Smokers will have a higher rate of lung cancer

  • Hypothesis: Smokers have a higher rate of lung cancer

  • If data align with prediction, hypothesis is supported; if not, rejected

  • Publication and verification by other scientists are essential to scientific validity

Research Concepts and Terminology

  • Control group: used for comparison with the experimental group; considered normal

  • Experimental group: exposed to treatment or variable of interest

  • Experiment: test designed to support or reject predictions

  • Hypothesis: testable explanation for a natural phenomenon

  • Variable: characteristic that differs among individuals

  • Independent variable: deliberately varied by the experimenter

  • Dependent variable: measured outcome affected by the independent variable

  • Inductive reasoning: drawing general conclusions from specific observations

  • Deductive reasoning: applying general principles to specific cases

Biology and Bioengineering: Definitions and Scope

  • Bioengineering: application of biology, physics, mathematics, and engineering to solve problems in biology, medicine, food industry, agriculture, environment, petroleum, clean energy, and more

  • Biology: science of life; the foundation of bioengineering and its numerous applications

  • Bioengineering permeates many industries and life aspects, underpinning major economic sectors

Food Industry and Pharmaceutical Applications

  • Fermentation: culture bacteria or microbes to produce food products (e.g., yogurt, cheese, etc.)

  • Use of small bioreactors in lab work by biologists and bioengineers

  • Role of bioengineers in advancing fermentation processes: controlling temperature, pH, volume, flow, and other parameters

Scaling Up Fermentation for Industrial Production

  • Challenges: large volumes, precise temperature control, heat and mass transfer, humidity control, pressure control, flow rates

  • This is a complex bioengineering problem requiring interdisciplinary collaboration (biology + engineering)

Biotech in Saudi Arabia: Industry Context

  • Food industry is critical to the economy (e.g., Almarai, dairy products like yogurt, cream, cheese)

Renewable Energy via Microbes (Circular Economy)

  • Concept: using microbes to convert organic waste into biogas (biomethane) for electricity production

  • Microbes catalyze biomethane formation from organic molecules

  • Impact: potential for significant electricity generation from biogas in developed nations within 10–15 years (targeting 20–25% of electricity from biogas in some contexts)

Biogas in Saudi Arabia and Vision 2030 Context

  • Example: Al-Ahsa municipality project to produce electricity from biogas at an old landfill, aligning environment care with energy diversification and investment returns under Vision 2030

Petroleum Industry: Microbial Enhanced Oil Recovery (MEOR)

  • MEOR uses oil-tolerant or surface-active microbes to emulsify oil or reduce oil viscosity

  • Lab demonstration of oil emulsification; field-scale improvements require integration of biology and engineering (bioengineering)

Bioengineering in Medicine

  • Growing field with integration into the human body

  • Prosthetics: design and implementation of artificial limbs with sensors (biosensors) to receive and analyze signals and respond to brain commands

  • Prosthetic design includes artificial arms, hips, and limbs; an engineering problem tackled with biological insight

Bioinstrumentation and Medical Imaging

  • CT Scan (Computed Tomography): combines data from multiple X-ray images to produce detailed cross-sectional images of internal structures

  • Bioengineering perspective: integrates engineering principles with biological knowledge to improve imaging and diagnostic capabilities

  • Medical professionals (doctors, nurses) focus on biology and medicine; engineers and bioengineers address the instrumentation and data processing aspects

Summary of End-of-Semester Home Assignment

  • Task: Find a device or equipment that embodies the concept of biology and engineering

  • Requirements: explain what it is used for and how it works