Name: microorganism groups and their roles
Uploaded: 2025-06-12T09:27:08.000Z
Duration: 1 min 29 s
Channel: JoVE

K12 Standards

Tennessee Academic Standards

Earth and Space Sciences

Earth's Systems

D. Weather and Climate

Types of Microorganisms

微生物分为细胞型和非细胞型。细胞形态包括细菌、古菌、真菌、原生动物和藻类，而无细胞形态则由病毒组成。细菌是具有多种形态和代谢适应性的单细胞原核生物，可在从土壤到人类肠道等各种环境中生长繁殖。示例包括 E. coli 和 Streptococcus。古菌也属于原核生物，可在极端环境（如温泉）以及温和环境（如土壤、海洋和人类微生物组）中繁衍生息。真菌是具有单细胞和多细胞形态的真核生物。它们通过分解有机物、循环养分以及形成菌根共生关系来促进植物生长。原生动物，例如 Amoeba 和 Plasmodium，是单细胞真核生物。一些是自由生活的，而另一些是寄生的，可引起疾病。藻类是一类能产生氧气并维持水生食物网的光合真核生物。病毒是无细胞结构的实体，由蛋白质外壳内的遗传物质组成。病毒依赖宿主细胞进行复制，从而引起感染和疾病。

微生物的种类

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Education

教育

JoVE Core

Microbiology

微生物学

Unit

单元

Introduction to Microbiology

微生物学导论

KEY TERMS AND CONCEPTS

关键术语与概念

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 ecosystems. Others, like Rhizobium and Azotobacter, help fix nitrogen and improve soil fertility.

Archaea are also prokaryotes. Many are known for living in extreme places such as hydrothermal vents and highly saline waters. They also live in more common habitats, including soils and oceans. Methanogens are a special group of archaea that produce methane, which matters in ecology and industry.

Fungi are eukaryotic organisms, which means their cells have a nucleus. They can be unicellular, like yeast, or multicellular, like molds and mushrooms. Fungi act as decomposers by recycling organic matter. They also form mycorrhizal partnerships that help plants absorb nutrients. People also use fungi to make antibiotics and fermented foods.

Protozoa are single-celled eukaryotes with varied lifestyles. They live in soil and aquatic environments. Some protozoa eat bacteria, and others serve as food for larger organisms. Free-living protozoa, such as Amoeba, help with nutrient cycling. Parasitic protozoa, such as Plasmodium, can cause malaria.

Algae are eukaryotic organisms that use photosynthesis. Examples include diatoms and Chlorella. They are important in aquatic ecosystems because they produce oxygen and form the base of many food webs. This makes them key to the balance of gases in the atmosphere.

Viruses are acellular and contain genetic material inside a protein coat. They cannot replicate on their own and must use host cells to make more viruses. Some viruses are harmful and cause illnesses such as flu and HIV infection. Even so, viruses are useful in biotechnology, including vaccine development and gene therapy.

Microorganism Groups and Their Roles

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

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

environmental-applications-of-microorganisms

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...

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

Explore bacteria, archaea, fungi, protozoa, algae, and viruses. Learn how these microorganisms live, support ecosystems, and affect health and biotechnology.

Microorganism Groups and Their Roles | 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

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

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

Weather and Climate

MS-ESS2-5

MS-ESS2-6

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

South Carolina College and Career Ready Science Standards

Earth and Space Science

6-ESS2-5

6-ESS2-6

Earth and Human Activity

7-ESS3-5

Convection

Convection is the transfer of heat through fluids (liquids or gases) caused by the movement of molecules. It occurs when warmer, less dense parts of a

Density and Volume

Density and volume are important properties that help us understand the nature of matter. Volume measures the amount of space an object occupies, whil

Solar Energy on Earth

The Sun is the main source of energy for life on Earth. This energy travels through space in the form of electromagnetic radiation. It moves in waves 

Gather evidence to justify that oceanic convection currents are caused by the sun's transfer of heat energy and differences in salt concentration leading to global water movement.
EXPLANATION: Understanding of ocean convection currents requires that students are familiar with: unequal heating of the earth's surface (built from 5.ess1.5), the density-related rise of heated fluids, and the density-related descent of cooler fluids. From third grade, students will have developed understandings of mass and volume; however, the topic of density will need to be explored to fully support 6.ESS2.1 and 6.ESS2.2. Demonstrations of the temperature-based behavior can be performed by heating one side of a water-filled baking dish and cooling the opposite side. If the water is initially allowed to settle, drops of food coloring will trace out the convection patterns which develop. Pipets can be used to insert the food coloring into the lower currents. Models for the effect of salt on creating a sinking mass of water can be accomplished by partially filling a large container with water then covering the surface of the water with plastic wrap and pouring an additional volume of salt-containing, colored water onto the wrap. With the gentle removal of the plastic wrap, the mixing will be visible. Reversing the order that the waters are added will provide alternate effects, and finally using two samples with coloring but no salt can provide a control. (Calculations of density are beyond the scope of this standard.)

c-the-roles-of-water-in-earth-s-surface-processes

C. The Roles of Water in Earth's Surface Processes

Circulation in the Atmosphere

Atmospheric circulation is the large-scale movement of air that helps distribute heat and moisture around the Earth. This circulation is driven by sol

Microorganisms are a diverse group of microscopic entities broadly categorized into cellular and acellular types based on their structural organization. ...

Solar Energy and Latitude

The amount of solar energy that reaches different parts of the Earth’s surface depends on latitude. Areas near the equator receive more direct sunligh

Heat Transfer in the Atmosphere

The Sun heats Earth’s surface, and that energy is then transferred throughout the atmosphere in different ways. Heat moves through the atmosphere by t

Diagram convection patterns that flow due to uneven heating of the earth.
EXPLANATION: The process of convection is explored both in the ocean (6.ESS2.1) and in the atmosphere (6.ESS2.2). Models for oceanic convection based on temperature differences are appropriate for use to explain atmospheric convection processes. Atmospheric movements lead to the transport of water from stores and to certain areas of Earth's surface. A model for heating of the Earth shows more direct heating of the earth's equator relative to the poles creating two large convection cycles which move upward at the equator and descend at the poles. When the rotation of the earth is factored in, the two convection cycles are broken into a total of six cycles. This effect (Coriolis effect) can be modeled by a pair of students using a marker and a large sphere. If the sphere is stationary, a student can use a marker to draw a straight line from the equator to the poles. If the ball is rotated while drawing this same straight line, the resulting line drawn on the sphere will curve. Rate of rotation determines the severity of the curvature, Earth's angular velocity results in three cells, with deserts focused at latitudes near 30 degrees and 60 degrees north and south, and predictable surface winds. (Memorization of global wind patterns and layers of the atmosphere are beyond the scope of this standard.)

Weather vs Climate

The weather is the short-term state of the atmosphere in a specific place. It includes conditions like temperature, wind, clouds, and precipitation th

effect-of-altitude-and-mountains-on-climate

Effect of Altitude and Mountains on Climate

Altitude, or elevation, is the height of a place above sea level. As altitude increases, temperature generally decreases. This means that even in trop

effect-of-continental-position-on-climate

Effect of Continental Position on Climate

A location’s position on a continent can affect its climate. Coastal areas near oceans tend to have milder climates, with smaller temperature changes 

Carbon Cycle and Climate

The carbon cycle is the way carbon moves through Earth’s systems, air, water, soil, rocks, and living things. Carbon is stored in places like the ocea

Construct an explanation for how atmospheric flow, geographic features, and ocean currents affect the climate of a region through heat transfer.
EXPLANATION: Weather describes the immediate atmospheric conditions in a particular location, whereas climate describes long term patterns in a region's weather. It is possible for the climate in a region to vary from the climate seen at similar latitudes due to the presence of geographic features such as mountains or lakes. Coastal air rising over mountains will be depleted of its moisture and create deserts on the back side of the mountain. Likewise, large bodies of water can influence the temperature and humidity of a region due to the ability of water to store large amounts of thermal energy.

Groundwater

Groundwater is the water located beneath Earth's surface in soil pore spaces and in the fractures of rock formations. It plays a crucial role in the h

Groundwater Aquifers

Aquifers are underground layers of water-bearing permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt) from which ground

Soil Erosion

Soil is one of Earth’s most valuable natural resources, but it can be lost through erosion—the process of soil being worn away by wind, water, and hum

Avoiding Soil Loss

Soil is essential for plant growth, water filtration, and supporting ecosystems, but it can be lost due to erosion, deforestation, and poor farming pr

Erosion by Streams - I

Water erosion happens when moving water carries away soil, sand, and rocks. Runoff from rain or melting snow flows over land, picking up loose particl

Erosion by Streams - II

Streams that begin in the mountains help shape the land as they flow. When the water moves quickly down steep slopes, it carries rocks and sediments w

Erosion by Groundwater

Groundwater is water that moves slowly through spaces in soil and rock beneath Earth’s surface. Over time, groundwater can cause erosion by dissolving

Water Conservation

Water conservation means using water wisely so we don’t waste it or run out. Freshwater is limited, and agriculture uses the most, often inefficiently

Apply scientific principles to design a method to analyze and interpret the impact of humans and other organisms on the hydrologic cycle.
EXPLANATION: Biogeological discussions in 4.ESS2.3 were general, whereas 6.ESS2.4 focuses specifically on the hydrologic cycle. Some organisms such as plants have very defined and ongoing involvement through transpiration. Other impacts have occurred over time including changes to water tables, and the effects of rates of weathering and erosion to land surfaces on watersheds and wetlands.

E. Biogeology

Collecting Weather Data

Weather data is information that scientists gather to understand and predict atmospheric conditions. This includes measurements like temperature, air 

Predicting Weather

Predicting the weather means using data about the atmosphere to forecast what conditions will be like in the near future. Meteorologists gather inform

Weather Maps

Weather maps are visual tools that show current and forecasted atmospheric conditions across different areas. They can display temperature, air pressu

Radar Systems: Applications

Radar systems are tools that use waves—usually radio or microwaves—to detect the location, speed, and shape of objects. RADAR stands for Radio Detecti

Air Pressure

Air pressure is the force exerted by air molecules as they move and collide with surfaces. It plays a crucial role in weather patterns, breathing, and

Analyze and interpret data from weather conditions, weather maps, satellites, and radar to predict probable local weather patterns and conditions.
EXPLANATION: The ability to recognize global patterns in climate distributions, describe deviations such as deserts created by the rain shadow effect is dependent, or to make predictions for future weather is dependent on collecting and interpreting weather related data. Examples of data from weather conditions include wind speed, wind direction, air temperature, humidity, and air pressure. In 3.ESS2.3, students were introduced to the use of tools to read temperature, precipitation, wind speed, and wind direction. By making a barometer, students are able to gain a better understanding of the intangible idea of air pressure. A vacuum demonstration is a good method to experience the phenomenon of air pressure. At this grade level, understanding should move beyond making readings and include a focus on using data to make predictions. (Emphasis should be how high and low pressures are related to current weather conditions. Differentiation of cloud types was addressed in 3.ESS2.2.)

Air Masses

An air mass is a large body of air that has the same temperature and moisture level throughout. Air masses form over land or water and take on the cha

Fronts

A front is the boundary between two different air masses. When warm and cold air masses meet, they don’t mix well because of differences in temperatur

Thunderstorms

A thunderstorm is a powerful weather event that forms when warm, moist air rises quickly into cooler air. This rapid rise causes clouds to grow tall a

Cyclones

Cyclones, also known as hurricanes or typhoons, depending on their location, are powerful rotating storm systems characterized by low-pressure centers

Explain how relationships between the movement and interactions of air masses, high and low pressure systems, and frontal boundaries result in weather conditions and severe storms.
EXPLANATION: The underlying principle is that high-pressure areas will push into or fill low-pressure areas. Low-pressure areas are columns of the atmosphere with a lower-pressure than surrounding air. As the surrounding higher pressure air pushes in to fill this area, the air in this low pressure column is displaced upward where condensation and precipitation occur as the elevation of this air increases. This air mass spins due again to Earth's rotation (Coriolis Effect). The opposite phenomenon occurs for high pressure areas, with a resulting spin in the opposite direction. The convergence of opposing pressure fronts creates severe weather phenomena due to the inverse nature of the air masses. This standard includes both occluded and stationary fronts, but not the memorization of specific air masses (e.g., continental polar or maritime tropical).

Microorganism Groups and Their Roles

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