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from article Computer virus
Some viruses are more destructive than others, causing devastation or theft of data. (Credit: iStockphoto.com/Zmeel Photography)
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from article Computer virus
Purposes for creating viruses.
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from article Computer virus
Daily virus threats experienced by large organizations.
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from article Computer virus
Examples of vulnerabilities to computer viruses.
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from article Computer programming
Program code. (Credit: Max Delson Martins Santos/Getty Images)
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from article Teleconferencing
A typical teleconference. (Courtesy of Lifesize, www.lifesize.com)
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from article Plant-water relations
Water transport system in plants. The xylem (the principal water-conducting tissue) is continuous from the roots through the stem to the leaves. (Copyright © McGraw-Hill Education)
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from article Plant-water relations
Relationship of water and turgor pressure in plants: (a) the plant cells in a wilted plant need water; (b) after water enters the plant, the plant cells become turgid. (Copyright © McGraw-Hill Education)
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from article Plant-water relations
Light-microscope view of a stoma on a plant cell. (Credit: Bumbim/Stockimo/Alamy Stock Photo)
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from article Plant-water relations
Daily periodicity of transpiration of alfalfa on three successive days with adequate light, temperature, and soil water conditions. (Copyright © McGraw-Hill Education)
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from article Plant-water relations
Colored scanning electron micrograph (SEM) of a section through wood showing the phloem vessels (dark green holes) and xylem tissue (lower frame). (Credit: Steve Gschmeissner/SPL/Getty Images)
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from article Mass spectrometry
Mass spectra of creatine (molecular weight 131) obtained by (a) electron impact, (b) chemical ionization, (c) field ionization, and (d) field desorption with moderate heating. Both the molecular ion (not observed in a) and the M + 1 ion in b, c, and…
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from article Mass spectrometry
Representative gas-phase proton affinities of molecules.
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from article Mass spectrometry
Potential well of a molecule: (a) undistorted, with ionization potential I near a metal with work function ϕ in the absence of a field gradient; and (b) in a strong field gradient. Near the metal surface the external field raises the most weakly…
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from article Mass spectrometry
Use of isotope distribution to determine elemental composition. (a) Molecular ion for a compound containing one bromine atom. (b) Molecular ion for a compound containing two bromine atoms. (c) Molecular ion for a compound containing neither bromine…
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from article Mass spectrometry
Mass spectra of (a) acetophenone and (b) valerophenone, using electron impact.
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from article Mass spectrometry
Scale-expanded portion of acetophenone spectrum showing a broad metastable ion at m/e 56.5.
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from article Supramolecular chemistry
Schematic representation of the self-assembly of a tricompartmental cagelike architecture by coordination of 7 ligands of two different types and 12 Cu(I) metal ions: R groups are omitted for clarity on the assembled entity (right). (After P. N. W.…
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from article Plant communication
Hillsides in central California covered by hard chaparral composed almost entirely of chemise shrubs. Chemise (also spelled chamise) produces allelopathic chemicals that, through plant communication, inhibit the germination of seeds and the…
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from article Greenhouse
A greenhouse is a transparent, enclosed, climate-controlled structure in which young, tender, or out-of-season plants are cultivated and protected. (Credit: Antema/Getty Images)
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from article Greenhouse
Common commercial greenhouse shapes are the hoop, arch, and gable.
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from article Greenhouse
Interior of an agricultural high tunnel. Long rows of fresh green lettuce are being cultivated. (Credit: Photology1971/Shutterstock)
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from article Greenhouse
Modern greenhouses utilize computerized technologies to control and regulate various environmental parameters, including air temperature, air movement, carbon dioxide concentration, relative humidity, and supplemental light. (Credit:…
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from article Licorice
Small cut pieces of dried licorice root (Glycyrrhiza glabra).
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from article Centrifugation
Laboratory centrifuge. (Credit: McGraw-Hill Education)
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from article Centrifugation
Centrifuge used in the development of new therapeutic molecules based on human antibodies for the treatment of infectious and inflammatory diseases, Biotherapix, Grupo Genetrix, Madrid, Spain. (Credit: Pixtal/AGE Fotostock)
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from article Seed
Basic eudicot (bean) and monocot (corn) seed structure and germination. (Copyright © McGraw Hill)
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from article Seed
Seed structures: (a) median longitudinal section of pea ovule shortly after fertilization, showing attachment to pod tissues; (b) mature kidney bean; (c) mature castor bean; (d) opened embryo of mature kidney bean. Scale bar = (a, b) 0.5 mm (0.02…
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from article Seed
In this longitudinal section of a castor bean seed, the median embryo is surrounded by copious endosperm. Scale bar = 1 mm (0.04 in.). (Credit: Steven P. Lynch)
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from article Seed
Seed dormancy and viability during development under (a) field conditions and (b) greenhouse conditions. Black medick (Medicago lupulina) seeds were detached from the plant and tested for germination. Three phases of germinability occurred depending…
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from article Seed
A germinating cabbage seed in soil with the root developing with root hair. (Credit: Nigel Cattlin/Alamy Stock Photo)
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from article Currant
American black currants (Ribes americanum). (Photo courtesy of Steve Hurst, ARS Systematic Botany and Mycology Laboratory, USDA)
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from article Currant
Flowering branch of golden currant (Ribes aureum). (Photo courtesy of Susan McDougall )
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from article WiMAX broadband wireless communications
Fixed and mobile WiMAX services.
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from article WiMAX broadband wireless communications
WiMAX Advanced Antenna Systems (AAS) using multiple-input techniques. (a) Increased robustness using multiple input–single output (MISO). (b) Increased capacity using multiple input–multiple output (MIMO).
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from article Touch-screen display
Doctor using a touch-screen tablet. (Credit: John Lamb/Getty Images)
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from article Touch-screen display
Capacitive touch sensor. (a) A single electrode is brought to a potential +V, and the resulting charge accumulated is recorded and determines the capacitance of the electrode. (b) The electrode is still held at potential +V, but because of the…
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from article Touch-screen display
In mutual capacitance sensing, two electrodes are used. The potential difference between them is changed by a small amount dV, and the resulting change of charge on one of them is examined. In the presence of a finger, this amount of charge differs,…
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from article Touch-screen display
Optical-over-the-display method. (a) Two cameras are inspecting the surface parallel to the display, while 18 light sources are distributed around the edges. Each camera in this specific scenario has a view of 12 of the light sources. (b) Once a…
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from article Touch-screen display
Optical-in-the-display method. Looking through a cross section of the cover glass on the display, we see one light source launching light into the glass, which serves as a waveguide. When the finger touches the glass, some of the light leaks…
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from article Touch-screen display
Resistive method. (a) Cross section of typical resistive sensor. Two conductive layers are laminated on transparent material (glass, clear plastic, or a similar material), and are kept with a small space between them (usually about 40 μm). (b)…
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from article Rape
Rape (Brassica napus). (Credit: Howard F. Schwartz)
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from article Photosynthesis
A simplified diagram of a chloroplast is used to delineate the overall process of photosynthesis. Chloroplasts in the plant cells of leaves absorb light energy and convert it into chemical energy, which is used to synthesize carbohydrates (CH2O) and…
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from article Photosynthesis
The photosynthetic electron transport system provides the means to drive the process of oxygenic photosynthesis, which involves the oxidation of water (H2O) to produce oxygen (O2) molecules. These oxygen molecules are then released into the…
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from article Photosynthesis
A typical chloroplast: (a) schematic diagram of a higher plant chloroplast; (b) electron micrograph of a chloroplast. (Credit: Based on original images provided by L. Taiz and E. Zeiger)
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from article Photosynthesis
A diagram of the four major protein complexes of the thylakoid membrane. (Copyright © McGraw-Hill Education)
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from article Photosynthesis
Absorption spectra of three photosynthetic pigments: chlorophyll a, chlorophyll b, and the carotenoids. (Copyright © McGraw-Hill Education)
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from article Photosynthesis
Schematic outline of the C3 (Calvin-Benson-Bassham) carbon dioxide assimilation cycle (including the three phases of carboxylation, reduction, and regeneration), showing the partitioning of assimilated carbon into starch within the chloroplast [via…
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from article Photosynthesis
Colorized structural model of Rubisco. (Copyright © McGraw-Hill Education)
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from article Photosynthesis
Schematic outline of the C4 carbon dioxide assimilation process in the mesophyll cells and bundle sheath cells of a type-1 NADP-ME plant. (Copyright © McGraw-Hill Education)
