Topics: a map of the guide
This map lists every subject in the guide, grouped by field. Each entry has a sentence on what the page covers, so that you can go straight to what you need, or wander from one field into the next.
How the fields fit together
Biotechnology does not divide neatly. A single organism can matter to several fields at once: the soil fungus Trichoderma, for example, appears in agriculture as an antagonist of crop diseases and in mushroom growing as the cause of green mould. The groupings here are a convenience for readers, not a claim about how the science itself is organised, and many pages point across to their neighbours in other groups.
Microbes and industry is about microorganisms as producers. The pages here look at how microbes are grown on solids and in liquids, what they make, and how researchers find strains that make something useful. The common thread is that a microbe's own metabolism, understood and managed, becomes a manufacturing process.
Environment turns the same organisms toward waste and pollution. Here the question is not what a microbe can make but what it can break down, take up or convert, and whether that can be done at a useful scale and cost.
Plants and crops covers the long partnership between biotechnology and agriculture: multiplying plants in sterile culture, starting crops from clean material, protecting them with living organisms rather than only chemicals, breeding them for difficult soils, and reading their DNA to make decisions earlier.
Medicine and pharma covers the parts of the subject closest to health: how protein medicines are produced, how formulation controls the release of a medicine, how different kinds of medicine reach their targets, and a classic puzzle in the classification of a pathogen. These pages explain science as reported by published reviews and reference sources; they give no advice.
Lab methods gathers the techniques every other page depends on, above all sterile working, and defines the vocabulary.
Reading research steps back from the science to the literature. It explains how a research paper is put together, what peer review does and does not do, how to reach the complete text of an article, and how to interpret the identifiers and listings journals display. These pages are useful whatever field you are reading in.
Using the map
Each subject page follows the same broad pattern. It opens with what the subject is, moves on to how it works in principle and why researchers care about it, and closes with its limits and with a few questions worth asking when reading research on it. Every page ends with a short paragraph pointing to related subjects, so that a reader who starts with rice can find their way to DNA markers, and a reader who starts with enzymes can find their way to pollution clean-up. Sources are named and linked in the text of each page rather than gathered in lists, so the evidence for a statement always sits beside it.
If you are new to the subject, a good route is to start with how a research paper is built and the glossary, then pick a field.
Solid-state fermentation: how fungi grown on moist bran and other farm residues are used to make enzymes, and why the method suits them.
Coloured bacteria: why some microbes make pigments, the famous red of Serratia marcescens, and how pigmented colonies are studied.
Uricase: the enzyme most living things carry and humans lost, and how microbes are screened as sources of enzymes.
Bioremediation: using bacteria, fungi, algae and plants against pollution, and the real limits of the approach.
Microalgae: tiny photosynthetic cells grown on wastewater, and the long, unfinished pursuit of fuel from algae.
Microbial fuel cells: how bacteria on an electrode produce a current, and what still stands between the idea and industry.
Micropropagation: multiplying plants from small pieces of tissue in sterile jars, with aloe as an example crop.
Clean seed potatoes: why viruses build up in tuber-grown crops, and how meristem culture breaks the chain.
Biological control: rice sheath blight, and the fungi and bacteria studied as its natural antagonists.
Salt-tolerant rice: what salty soil does to a crop and how breeders approach a trait governed by many genes.
Papaya sexing: three kinds of papaya plant, and the DNA tests that tell seedlings apart before they flower.
Protein medicines: from recombinant DNA to hamster ovary cells and steel bioreactors, with insulin as the historic first.
Controlled-release tablets: how a matrix slows release and why the rate matters to bioavailability.
How medicines reach their targets: routes, bioavailability, and why proteins and peptides are so hard to give by mouth.
Rhinosporidium seeberi: a pathogen that resisted classification for over a century, and where the evidence now places it.
Sterilising culture media: why media must be sterile, how autoclaves work in principle, and a question about microwaves.
Glossary: plain definitions of the terms used throughout the guide.
How a research paper is built: the IMRaD structure and how to read a paper efficiently.
How peer review works: editors, reviewers, anonymity, and what review can and cannot catch.
Finding the full text: abstracts versus papers, open access, PubMed and DOAJ, and legitimate routes to reading.
Judging a journal: what serial numbers, index listings and checklists do and do not tell you.
For what the guide is, and what it deliberately does not do, see About Bench & Field. The front page introduces biotechnology itself.