Module 1: Introduction to Biomimicry and Biological Applications in Engineering

Module 1: Objectives and Introduction to Biology in Engineering

• Biology is established as an independent scientific discipline that involves exploring key concepts, principles, and its deep relevance to society and ethics.
• The importance of studying biology is recognized through its significant contributions to medicine, environmental science, biotechnology, and its role in addressing global issues.
• The application of biology in engineering is multifaceted, encompassing:
  • Biotechnology
  • Bioremediation
  • Bioinformatics
  • Biologically inspired engineering
  • Biomimicry
• Analysis of $19^{th}$-century biological discoveries provides a foundation for modern scientific research, connecting historical breakthroughs to current advancements and their influence on engineering-based biomimicry.

Defining Science and Engineering

• Science is characterized as the pursuit of knowing, whereas engineering is the practice of doing.
• Science represents the synthesis of knowledge through the understanding of the laws of nature.
• Engineering is the application of scientific knowledge to transform nature for the service of humanity.
• Comparative attributes include:
  • Science: Focuses on theoretical knowledge, concepts, and skills. It is the study of what already exists.
  • Engineering: Focuses on practical knowledge, instruments, and products. It involves creating what never existed before.
• Engineers utilize scientific principles, mathematics, and technology to design creative solutions to practical challenges.

Comparative Analysis: The Human Eye and the Camera

• The human eye is a biological instrument that utilizes refraction and lenses to form images, sharing several functional similarities with a camera:
  • Light Control: Both systems use a diaphragm. In a camera, this is the shutter; in the eye, it is the pupil at the center of the iris.
  • Image Formation: Both systems utilize a lens to focus light and create a real, inverted image.
  • Image Sensing: A camera uses film (or a digital sensor) to record images. In the eye, the image is focused on the retina. A system of rods and cones serves as the front end of an image-processing system, converting the image into electrical impulses sent via the optic nerve to the brain.

Biologically Inspired Engineering: Human Eye-Inspired Lenses

• Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a flat, electronically controlled lens inspired by the human eye.
• This technology combines artificial muscle developments with flat lens technology.
• Key features of the research include:
  • The device is approximately $1\,cm$ in diameter.
  • It is capable of focusing in real-time.
  • It exceeds biological limitations by adjusting for image shift and astigmatism.
• Potential applications of this technology include phone cameras, telescopes, and various optical instruments.

The Importance of Biology in Modern Society

• Biology provides the necessary foundation for understanding the fundamental principles of life, including growth, development, and the mechanisms governing living organisms.
• It enables the study of the world at every scale, from microscopic cellular structures to the largest global ecosystems.
• Biology is essential for addressing critical planetary issues, such as:
  • Climate change
  • Biodiversity loss
  • Emerging infectious diseases
• Biological knowledge facilitates the development of sustainable, environmentally friendly technologies and practices.
• Health and well-being are improved through biological insights into body functions, disease causes, prevention, and treatment.
• Studying biology fosters scientific literacy, critical thinking, and problem-solving skills while inspiring a sense of wonder for the natural world.
• Practical examples include the development of $COVID-19$ vaccines, which relied on understanding the structure and function of the $SARS-CoV-2$ virus and the human immune response.

Historical Foundations: $19^{th}$-Century Discoveries and Brownian Motion

• Advances in microscopy during the $19^{th}$ century allowed scientists to investigate cells and molecules with unprecedented detail.
• In $1827$, botanist Robert Brown observed pollen from the plant Clarkia pulchella immersed in water. He noted that triangular-shaped pollen burst at the corners and emitted particles that moved in a random, jiggling fashion.
• Characteristics of Brownian motion:
  • It consists of random fluctuations in a particle's position within a fluid.
  • The pattern involves fluctuations within a sub-domain followed by relocation to a new volume.
• In $1905$, Albert Einstein published a paper providing a precise mathematical explanation for this motion. He demonstrated that the pollen was being moved by the impacts of individual water molecules, confirming the existence of atoms and molecules.
• This discovery paved the way for statistical mechanics and has applications in chemistry, materials science, and engineering.

Applied Biology and Biotechnology

• Biology is categorized into several practical branches:
  • Zoology
  • Microbiology
  • Botany
  • Environmental Sciences
• Biotechnology is defined as any technological application using biological systems or living organisms to modify products or processes for specific uses.
• Key areas of biotechnology include:
  • Medical Biotechnology: Developing new drugs, vaccines (e.g., insulin for diabetes), and cancer therapies.
  • Agricultural and Industrial Biotechnology: Improving crop yields, creating biofuels, and developing new chemicals and materials.
  • Transgenic Organisms: Creating organisms with genes from other species.
  • Genetically Modified Organisms (GMOs): Altering the genetic material of organisms to achieve desired traits.

Bioremediation: Environmental Restoration

• Bioremediation is a branch of biotechnology that uses living organisms, such as bacteria and microbes, to remove toxins, pollutants, and contaminants from soil and water.
• It is frequently used for cleaning up contaminated groundwater and oil spills.
• Application methods:
  • In situ: Removing contaminants at the site of pollution.
  • Ex situ: Removing contaminants away from the site of pollution.
• The process works by stimulating the growth of microbes that use contaminants like solvents, oil, and pesticides as food. These microbes convert the toxins into small amounts of water and harmless gases like $CO_2$.

Bioinformatics and Data Science

• Bioinformatics combines biology and computer science to manage and analyze large-scale biological data.
• It plays a critical role in:
  • Genomics and Proteomics: Identifying genetic variations and studying gene expression.
  • Drug Discovery: Optimizing drug efficacy and predicting protein functions.
  • Personalised Medicine: Identifying genetic variations associated with diseases like Huntington's disease by comparing the genomes of diseased individuals with healthy ones.
• It involves a multidisciplinary approach including engineering, chemistry, mathematics, biochemistry, and statistics.

Mechanisms and Types of Biomimicry

• Biomimicry is a form of biologically inspired engineering that leverages nature's designs, ecosystems, and processes to solve engineering challenges.
• Sustainable engineering within biomimicry focuses on resource efficiency, waste reduction, and adaptation.

Biomimicry of Form and Structure

• This involves imitating the physical structure of natural entities.
• Example: Velcro. Georges de Mestral was inspired by the way burrs stuck to his dog's fur, leading him to create a synthetic hook-and-loop fastener.

Biomimicry of Processes

• This involves imitating natural systems like photosynthesis or the water cycle.
• Example: The Eastgate Centre in Harare, Zimbabwe. It utilizes a ventilation system modeled after termite mounds to regulate temperature without traditional heating or air conditioning.

Biomimicry of Ecosystems

• This involves imitating the functional logic of entire ecosystems, such as nutrient cycling in forests or the biodiversity of coral reefs.
• Example: Portland, Oregon. The city developed a stormwater management system using "eco-roofs." These roofs mimic forest functions by absorbing rainwater and providing habitats for insects and birds, thereby reducing runoff and increasing urban biodiversity.