Name: microbes in ecosystems and pollution control
Uploaded: 2025-06-12T09:27:26.000Z
Duration: 1 min 30 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

North Carolina K-12 Science Standard Course of Study

9-12

Earth and Environmental Science

Earth and Human Activity

ESS.EES.5.2

environmental-applications-of-microorganisms

Environmental Applications of Microorganisms

Los microorganismos son esenciales para reciclar elementos clave como el carbono, el nitrógeno y el fósforo.En el ciclo del carbono, los microbios descomponen la materia orgánica y liberan dióxido de carbono de forma aeróbica. Los organismos fotosintéticos utilizan este dióxido de carbono para producir compuestos orgánicos.Las bacterias fijadoras de nitrógeno, como Rhizobium, forman relaciones simbióticas con las leguminosas, convirtiendo el nitrógeno atmosférico en amoníaco para enriquecer el suelo.Los microbios, como Pseudomonas, devuelven nitrógeno a la atmósfera a través de la desnitrificación.Ciertas especies de Bacillus, como Bacillus subtilis, solubilizan los fosfatos mediante la secreción de ácidos orgánicos, lo que aumenta la fertilidad del suelo.Los microbios también desempeñan un papel vital en el tratamiento de aguas residuales al descomponer los contaminantes orgánicos durante el tratamiento secundario, lo que reduce significativamente la demanda biológica de oxígeno de las aguas residuales.En la biorremediación, microbios como Pseudomonas putida y Aspergillus niger degradan hidrocarburos y bioacumulan metales pesados, respectivamente, transformando las toxinas en formas más seguras.Además, los microbios apoyan la producción de biocombustibles: la levadura fermenta los azúcares en etanol, mientras que las bacterias anaeróbicas generan biogás, compuesto principalmente de metano.

aplicaciones medioambientales de los microorganismos

Los microorganismos desempe&#241;an un papel fundamental en el mantenimiento del equilibrio de los ecosistemas mediante el reciclaje de elementos esenciales como el carbono, el nitr&#243;geno y el f&#243;sforo, as&#237; como al apoyar procesos como la biorremediaci&#243;n, el tratamiento de aguas residuales y la producci&#243;n de biocombustibles.
Microorganismos en los ciclos de los elementos
En el ciclo del carbono, los microorganismos descomponen la materia org&#225;nica, liberando di&#243;xido de carbono mediante la respiraci&#243;n aer&#243;bica. Este di&#243;xido de carbono es utilizado posteriormente por organismos fotosint&#233;ticos para sintetizar compuestos org&#225;nicos, cerrando as&#237; el ciclo del carbono.
En el ciclo del nitr&#243;geno, bacterias fijadoras de nitr&#243;geno como Rhizobium establecen asociaciones simbi&#243;ticas con leguminosas, convirtiendo el nitr&#243;geno atmosf&#233;rico (N_2) en amon&#237;aco (NH_3), que se transforma en iones amonio (NH_4^+) para su absorci&#243;n por las plantas. Este proceso enriquece el contenido de nitr&#243;geno del suelo, favoreciendo el crecimiento vegetal. Por otro lado, bacterias desnitrificantes como Pseudomonas desempe&#241;an un papel clave en la devoluci&#243;n del nitr&#243;geno a la atm&#243;sfera mediante la reducci&#243;n de nitratos a gas nitr&#243;geno (N_2).
De manera similar, ciertas especies bacterianas, como Pseudomonas fluorescens, solubilizan minerales fosfatados insolubles mediante la secreci&#243;n de &#225;cidos org&#225;nicos, aumentando as&#237; la disponibilidad de f&#243;sforo en el suelo y su fertilidad. Estos procesos garantizan la sostenibilidad de los ecosistemas y la productividad agr&#237;cola.
Microorganismos en el tratamiento de aguas residuales
Los procesos microbianos son fundamentales en la fase de tratamiento secundario de las aguas residuales. En esta etapa, los microorganismos degradan contaminantes org&#225;nicos, reduciendo significativamente la demanda biol&#243;gica de ox&#237;geno (DBO) del agua residual. Este paso minimiza el impacto ambiental del vertido de aguas residuales, asegurando sistemas h&#237;dricos m&#225;s limpios.
Biorremediaci&#243;n y control de la contaminaci&#243;n
Los microorganismos son indispensables en la biorremediaci&#243;n, un proceso que utiliza sus capacidades metab&#243;licas para degradar sustancias nocivas. Especies como Pseudomonas putida degradan eficazmente hidrocarburos, mientras que hongos como Aspergillus niger eliminan metales pesados principalmente mediante biosorci&#243;n. Estos procesos son cruciales para la limpieza de vertidos de petr&#243;leo, residuos industriales y otros contaminantes, transformando toxinas ambientales en compuestos menos perjudiciales.
Contribuciones microbianas a la producci&#243;n de biocombustibles
Los microorganismos tambi&#233;n permiten la producci&#243;n de energ&#237;a sostenible mediante la s&#237;ntesis de biocombustibles. Las levaduras fermentan az&#250;cares para producir etanol, un biocombustible de uso generalizado. Adem&#225;s, bacterias anaerobias generan metano durante la descomposici&#243;n de materia org&#225;nica, gas que se aprovecha como biog&#225;s. Estos procesos microbianos ofrecen alternativas renovables a los combustibles f&#243;siles, contribuyendo a la sostenibilidad energ&#233;tica global.
Mediante el desempe&#241;o de estas funciones diversas y cr&#237;ticas, los microorganismos sustentan los procesos ecol&#243;gicos e industriales que mantienen la vida en la Tierra. Aseguran la salud de los ecosistemas, promueven la productividad agr&#237;cola y respaldan pr&#225;cticas industriales m&#225;s limpias y sostenibles.

Aplicaciones medioambientales de los microorganismos

Los microorganismos desempe&#241;an un papel fundamental en el mantenimiento del equilibrio de los ecosistemas mediante el reciclaje de elementos ...

Education

Educación

JoVE Core

Microbiology

Microbiología

Unit

Unidad

Introduction to Microbiology

Introducción a la microbiología

KEY TERMS AND CONCEPTS

TÉRMINOS Y CONCEPTOS CLAVE

microbes in ecosystems and pollution control

Microorganisms help keep ecosystems balanced by recycling carbon, nitrogen, and phosphorus. They also support sewage treatment, bioremediation, and biofuel production. These roles make microbes important in both natural and human-made systems.

In the carbon cycle, microorganisms break down dead organic matter. During aerobic respiration, they release carbon dioxide. Photosynthetic organisms then use that carbon dioxide to make organic compounds, which helps close the carbon loop.

Microbes are also essential in the nitrogen cycle. Nitrogen-fixing bacteria such as Rhizobium live with legumes and convert atmospheric nitrogen into ammonia. That ammonia becomes ammonium ions for plant uptake. Denitrifying bacteria such as Pseudomonas return nitrogen to the atmosphere by reducing nitrates to nitrogen gas.

Some bacteria also help make phosphorus easier for plants to use. Pseudomonas fluorescens can solubilize insoluble phosphate minerals by releasing organic acids. This increases soil phosphorus availability and improves fertility.

Microorganisms play a major role in secondary sewage treatment. They break down organic pollutants in wastewater and lower biological oxygen demand, or BOD. This helps reduce the environmental impact of wastewater before it is discharged.

Microbes are also used in bioremediation, which is the cleanup of polluted sites using living organisms. Pseudomonas putida can degrade hydrocarbons, and fungi such as Aspergillus niger can remove heavy metals through biosorption. These processes help clean oil spills, industrial waste, and other toxic materials.

Microorganisms also support biofuel production. Yeasts ferment sugars into ethanol, which is used as a biofuel. Anaerobic bacteria produce methane as organic matter decomposes, and that methane can be collected as biogas. Together, these microbial processes support cleaner energy and more sustainable industry.

Microbes in Ecosystems and Pollution Control

microbes-in-ecosystems-and-pollution-control

history of microbiology

Microbiology's Key Discoveries Over Time

Microbiology is the study of microorganisms, and its history is shaped by major discoveries about life at the microscopic level. Since the 17th century, new tools and experiments have changed how scientists understand microbes and their effects on medicine, agriculture, and industry. The early foundations of microbiology began with better microscopes and careful observation. In 1665, Robert Hooke examined thin slices of cork with a crude microscope and described the small boxlike spaces he saw.

two-dimensional microscopy in microbiology

two-dimensional-microscopy-in-microbiology

Microscopy Methods for Viewing Microbes

Two-dimensional microscopy helps scientists view microbes and cells in a single focal plane. It is widely used in biological and medical research because it shows cellular and subcellular structures with different levels of contrast and detail. Each method has its own strengths, so the best choice depends on the specimen and the question being studied. Bright-field microscopy is the most common form of light microscopy. It uses transmitted light that passes through the specimen, and stains are...

three-dimensional microscopy in microbiology

three-dimensional-microscopy-in-microbiology

Live and Deep Cell Imaging Methods

Three-dimensional imaging methods help scientists see cell structures with more detail. In microbiology, Differential Interference Contrast Microscopy, or DIC, and Confocal Scanning Laser Microscopy, or CSLM, are two important tools. They each solve different imaging problems and give useful views of cells and tissues. DIC microscopy improves contrast in transparent, unstained samples. It works by turning phase differences, which come from changes in refractive index inside cell structures,...

simple staining technique

Staining Microbes for Shape and Arrangement

Simple staining helps reveal the size, shape, and arrangement of microorganisms under the microscope. It uses one dye to color the whole cell. That creates strong contrast between the cells and the background. A careful preparation step comes first. A small drop of microbial culture is spread on a clean glass slide to make a thin smear. The smear is air-dried and then heat-fixed, which means it is briefly passed over a flame. Heat fixation keeps the cells attached to the slide. It also helps...

differential staining technique

Gram and Acid-Fast Staining Methods

Gram and acid-fast staining methods help scientists tell bacteria apart by looking at their cell walls. These differential stains are important in microbiology because they support identification, diagnosis, and research. They use structural and chemical differences in bacterial cell walls to separate microorganisms into clear groups. Gram staining classifies bacteria as gram-positive or gram-negative. A heat-fixed bacterial smear is first stained with crystal violet, and iodine is added to...

special staining techniques

Bacterial Stains for Capsules, Spores, Flagella

Special bacterial stains help reveal capsule, endospore, and flagella structures that standard microscopy cannot show clearly. These stains improve how microbiologists identify bacteria and understand features linked to disease and classification. They are also useful in diagnosis and research because they expose key parts of bacterial cells. Capsule staining is a negative staining method that makes the capsule visible. A bacterial capsule is an outer layer that can act as a virulence factor,...

key techniques in microbiology

Aseptic Methods for Microbial Cultures

Aseptic methods help keep microbial cultures clean, safe, and accurate in the laboratory. These practices reduce contamination and protect both researchers and the microbes being studied. They are important in clinical, industrial, and research settings where sterility matters. Laboratory sterility starts with cleaning tools and surfaces. Scientists sterilize equipment with heat or chemicals and disinfect work areas before handling cultures. They also work near an open flame or inside a...

types of microorganisms

Microorganism Groups and Their Roles

Microorganisms are tiny life forms and particles that can be grouped by structure. Cellular microorganisms include bacteria, archaea, fungi, protozoa, and algae. Viruses are acellular, which means they are not made of cells. Bacteria are prokaryotic organisms, so they do not have a nucleus. They can be rod-shaped, spherical, or spiral-shaped. Bacteria live in soil, water, and human-associated places like the gut. Some, such as Escherichia coli and Streptococcus, are important in health and...

environmental applications of microorganisms

Microorganisms help keep ecosystems balanced by recycling carbon, nitrogen, and phosphorus. They also support sewage treatment, bioremediation, and biofuel production. These roles make microbes important in both natural and human-made systems. In the carbon cycle, microorganisms break down dead organic matter. During aerobic respiration, they release carbon dioxide. Photosynthetic organisms then use that carbon dioxide to make organic compounds, which helps close the carbon loop. Microbes are...

microorganisms in agriculture and food industry

microorganisms-in-agriculture-and-food-industry

How Microbes Improve Farming and Food

Microbes improve farming and food production by helping plants grow, protecting crops, and making foods such as bread, yogurt, and pickles. These tiny organisms support soil fertility, pest control, fermentation, and food preservation. They are a key part of sustainable agriculture and food safety. In agriculture, nitrogen-fixing bacteria turn nitrogen from the air into ammonia, which plants can use to build amino acids and proteins. Rhizobium lives with plant roots, while Azotobacter is...

microorganisms in medicine and therapeutics

microorganisms-in-medicine-and-therapeutics

Microbes in Vaccines and Gene Therapy

Microbes in vaccines and gene therapy help modern medicine prevent disease and treat genetic disorders. Scientists use the biological properties of microorganisms to support public health, improve immune protection, and make therapeutic products. These uses also include gut health and antibiotic production. Live attenuated vaccines use weakened pathogens, such as the measles, mumps, and rubella (MMR) vaccine. They act like a natural infection and can trigger cellular, humoral, and mucosal...

key terms and concepts

Learn how microorganisms recycle nutrients, treat sewage, clean pollutants, and produce biofuels. A clear high school look at microbes in the environment.

Microbes in Ecosystems and Pollution Control | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

ESS.EES.5.5

Earth's Systems

ESS.EES.4.2

Louisiana Student Standards for Science

High School

Life Sciences

from-molecules-to-organisms-structures-and-processes

From Molecules To Organisms: Structures And Processes

HS-LS1-8

Environmental Science

Environmental Awareness And Protection

HS-EVS2-1

Personal Responsibilities

HS-EVS3-1

Human Sustainability

HS-ESS3-4

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

Physical Geology

Earth's Resources

Soil and sediment

Virginia  Standards of Learning

HIgh School

Biology

BIO.4

BIO.4.d

new-york-state-science-learning-standards

New York State Science Learning Standards

Middle School

Earth and Space Sciences

Space Systems

MS-ESS1-1

Weather and Climate

MS-ESS2-5

MS-ESS2-6

Minnesota Academic Standards in Science

Earth and Space Science

4.2.2 Earth’s Place in the Universe

south-carolina-college-and-career-ready-science-standards

South Carolina College and Career Ready Science Standards

Earth's Place in the Universe

8-ESS1-3

6-ESS2-5

7-ESS3-5

8-ESS1-1

8-ESS1-2

6-ESS2-6

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Analyze and interpret data to explain the impacts of land use on Earth's systems.

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water-quality-analysis-via-indicator-organisms

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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as ...

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Construct an argument to evaluate the ways that human activities influence atmospheric composition.

ESS.EES.5.3

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Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
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Dye-sensitized Solar Cells

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Construct an argument to evaluate the benefits and trade-offs of using non-renewable or renewable energy sources for electricity production and transportation fuels.

ESS.EES.5.4

Proper Waste Disposal

Robert M. Rioux and Taslima A. Zaman, Pennsylvania State University, Pennsylvania, PA

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Construct an argument to evaluate a range of solutions to mitigate impacts of human activities on Earth's systems.

ESS.EES.5.6

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The factors influencing the health-illness continuum can be internal or external and may or may not be under conscious control. They are related to the ...

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not ...

Analyze and interpret data to infer how use of natural resources impacts ecosystems and human populations, including human health.

ESS.EES.6.1

Evaluate how human consumption patterns impact Earth's systems.

Microbes in Ecosystems and Pollution Control

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