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Project

1-Wire Weather Station

The weather station in this project is quite basic, measuring only temperature, pressure, and humidity, but it may be easily expanded to measure other weather components, such as wind speed and rainfall. The design is based on using a series of…

Project

3x3x3 LED Cube

LEDs (light-emitting diodes) are rectifying semiconductor devices that convert electrical energy into electromagnetic radiation. You can use these devices to create a 3-dimensional light display. LED cubes require some care and good soldering skills…

Project

Chatbot, an Artificially Intelligent Microcontroller

The term "Chatbot" is used for a computer or computer program that is made to emulate some form of human intelligence through conversation. In this project, you will learn how easy it is to make a specific microcontroller—an Arduino™ Uno—seem as…

Project

Text-Controlled RGB LED

A red, green, and blue (RGB) light-emitting diode (LED) is a useful electronic component that can produce visible light in a variety of colors. This is done by varying the intensity of the light output of the three different color LED elements (red,…

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from article Sonobuoy

Launch of a sonobuoy from an antisubmarine warfare (ASW) aircraft. (a) In flight. (b) Buoy strikes the water in a nearly vertical attitude. (c) Antenna and hydrophone are positioned automatically.

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from article Hematologic disorders

Myelophthisic anemia results from a space-occupying lesion in the bone marrow, which hinders hematopoiesis (the process by which the cellular elements of the blood are formed). In this photomicrograph, the bone marrow space is expanded, and the…

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from article Hematologic disorders

Scanning electron micrograph of (top) an elongated, flattened sickle cell and (bottom) a normal red blood cell. (Credit: Callista Images/Image Source/Getty Images)

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from article Hematologic disorders

Colored scanning electron micrograph of round leukocytes from a patient with leukemia. (Credit: Steve Gschmeissner/Science Photo Library)

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from article Electric filter

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from article Electric filter

Passive, lumped-element filters. (a) RC low-pass filter. (b) LC band-pass filter.

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from article Electric filter

Ladder structure. (a) Overall structure with alternating series and shunt arms. (b) LC circuit whose impedance contains both a finite-frequency pole and a zero. Such circuits are used in the series and shunt arms of the ladder structure.

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from article Electric filter

Mechanical filter.

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from article Electric filter

Single-amplifier filters. (a) Low-pass Sallen-Key filter. (b) Low-pass, infinite-gain, single-amplifier filter. (c) Cascade of second-order filter realizations.

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from article Electric filter

Multiple-amplifier filters. (a) State-variable (KHN) filter. (b) Tow-Thomas filter.

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from article Electric filter

Simulated-inductor realization of fifth-order high-pass filter. (a) RLC prototype, normalized for cutoff frequency of 1 rad/s (0.159 Hz). (b) Direct active-RC realization.

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from article Satellite television broadcasting

Direct broadcasting television satellite system.

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from article Medical bacteriology

Microscopic view of bacterial pneumonia, which is a type of pneumonia caused by bacterial infection. (Credit: Stocktrek Images/Corbis)

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from article Medical bacteriology

Bacteria culture growth on agar medium in a petri dish. (Credit: Sompraaong0042/Shutterstock)

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from article Genetically modified organism (GMO)

Transgenic zebrafish cells. Green fluorescent protein (GFP) is a fluorescent protein first discovered in the jellyfish Aequorea victoria. GFP is commonly used as a reporter of gene expression in other species. Here, GFP is expressed by zebrafish…

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from article Genetically modified organism (GMO)

Genome editing technologies. In particular, targeted nucleases are a powerful tool for precise genome editing in GMOs. Among these tools are (a) transcription activator-like effector nucleases (TALENs), (b) zinc-finger proteins (ZFPs), (c) homing…

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from article Channelrhodopsin

Three-dimensional (3D) protein crystal structure of channelrhodopsin variant C1C2. (Image courtesy of Protein Data Bank 3UG9, Molecular Modeling Database 96737)

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from article Plague

Plague ecology in the United States. The left panel shows how plague occurs in nature among rodents. The right panel shows how plague is spread from rodents to humans and domestic animals. (Credit: Centers for Disease Control and Prevention)

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from article Nursing

Nursing provides physical and emotional care to ailing individuals. (Credit: Fuse/Getty Images)

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from article Type 1 diabetes

One characteristic feature of type 1 diabetes is glomerulosclerosis (Kimmelstiel-Wilson lesion), which involves the scarring or hardening of the glomeruli (blood vessels) in the kidneys. (Copyright © McGraw Hill)

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from article Type 1 diabetes

Stages in the development of type 1 diabetes. (Credit: Type 1 Diabetes TrialNet)

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from article Yeast

Colorized scanning electron micrograph (SEM) of Schizosaccharomyces pombe yeast. This single-celled fungus is studied widely as a model organism for eukaryotic cell division. It is a rod-shaped yeast that grows by elongation at its ends, and it…

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from article Yeast

Cell shapes of yeasts are extremely varied: (a) rectangular; (b) pear-shaped; (c) apiculate; (d) ogival; (e) spherical; (f) globose; (g) ellipsoidal (oval); (h) elongate; (i) tetrahedral. (Copyright © McGraw Hill)

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from article Yeast

Colorized scanning electron micrograph (SEM) of cells of brewer's yeast (Saccharomyces cerevisiae). This yeast consists of single vegetative cells. Small daughter cells can be seen budding off from the larger cells. Saccharomyces cerevisiae ferments…

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from article Yeast

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from article Yeast

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from article Yeast

A fluorescent antibody stain reveals the oval budding yeast cells of Candida albicans. This yeast is the most common human fungal pathogen. (Credit: Maxine Jalbert and Leo Kaufman/Centers for Disease Control and Prevention)

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from article Foodborne disease

Trichrome-stained photomicrograph of a Giardia lamblia trophozoite (a growing stage in the life cycle of certain protozoan parasites). This microorganism often causes giardiasis (a diarrheal foodborne illness). (Credit: Melanie Moser/Centers for…

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from article Foodborne disease

A cluster of norovirus particles. (Credit: Charles D. Humphrey/Centers for Disease Control and Prevention)

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from article Foodborne disease

Colored scanning electron micrograph showing Salmonella enterica bacteria (serotype Typhimurium; colorized red) invading an immune cell (colorized yellow). This bacterial species commonly causes food-associated gastroenteritis. (Credit: National…

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from article Foodborne disease

Close-up view of Campylobacter jejuni bacteria. This scanning electron microscope image shows the characteristic spiral (or corkscrew) shape of C. jejuni cells. (Credit: De Wood and Chris Pooley/Agricultural Research Service, U.S. Department of…

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from article Trans fatty acid

Generalized chemical structure of the double bond in natural and common industrial monounsaturated fatty acids (18:1): configuration of the unsaturation site in monounsaturated fatty acids as found as a cis structure in natural fats/oils or as a…

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from article CRISPR/Cas9 gene editing

Acquisition of immunity in the CRISPR/Cas9 system. Bacterial cells that are not immune to a particular bacteriophage and that survive infection acquire immunity through the function of the cas1 and cas2 genes. Through unknown mechanisms, Cas1 and…

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from article CRISPR/Cas9 gene editing

The function of the CRISPR/Cas9 system in bacterial immunity. Bacterial cells that are immune to particular bacteriophage species contain protospacer sequences that match or closely match the bacteriophage genome. (1) The bacterial genome contains…

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from article CRISPR/Cas9 gene editing

The function of the CRISPR/Cas9 system in genome engineering. Multiple methods are used to engineer genomes using the CRISPR/Cas9 system. One common method is illustrated here. (1) An engineered cas9 gene and an engineered crRNA–tracrRNA fusion…

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from article Modeling language

Systems engineering work space.

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from article Modeling language

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from article Modeling language

Component diagram for car window control. The small rectangles signify that this is a component diagram.

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from article Modeling language

Example of deep dependency structure.

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from article Hepatitis

False-color transmission electron microscopy image of the hepatitis A virus (HAV). (Credit: BSIP/Getty Images)

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from article Hepatitis

Inflammation in chronic hepatitis C virus (HCV) infection. When the body is engaged in fighting chronic inflammation of the liver's portal tract (center of the photomicrograph), lymphocytes (white blood cells) are present. (Copyright © McGraw-Hill…

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from article Yersinia

Scanning electron micrograph (color-enhanced) of Yersinia pestis bacteria (yellow) on the proventricular spines of a Xenopsylla cheopis flea (purple). (Credit: National Institute of Allergy and Infectious Diseases)

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from article Disease

Photograph of a patient hospitalized during the Spanish influenza pandemic in 1918. This pandemic is considered to be one of the most devastating outbreaks of infectious disease in recorded history. (Credit: Everett Historical/Shutterstock)

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from article Environmental toxicology

June 2010 Deepwater Horizon Oil Spill in the Gulf of Mexico. Containment and controlled burn. (Credit: U.S. Navy photo by Mass Communication Specialist 2nd Class Justin Stumberg)

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from article Hypothermia

Body heat lost with exposure to 0°C air and 10°C water. °C = (°F − 32) 1.8 .

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from article Oncolytic virotherapy

One notable experimental oncolytic virotherapy technique involves the use of a modified poliovirus (PVS-RIPO) to combat glioblastoma (a type of brain cancer). The illustration shows a hypothetical model of how PVS-RIPO destroys brain tumors.…

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1-Wire Weather Station

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