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from article Speech perception

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The perception of speech (as well as the production of speech) involves interactive processes occurring in various regions of the brain. Researchers also have noted the important contribution that vision makes to normal speech perception. (Copyright…

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from article Speech perception

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An auditory spectrogram of the word "telephone." (a) The vertical striations in the bands represent amplitude modulation at the frequency of the voice pitch. Such striations are absent from the initial noise portion corresponding to the voiceless…

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from article Ovarian disorders

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Illustrations displaying a normal ovary (bottom left), a polycystic ovary (bottom right), and the location of the ovaries in relation to the uterus (top). In the polycystic ovary, follicle development is stopped, so there is no ovulation. (Credit:…

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from article Ovarian disorders

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Borderline serous surface epithelial tumor. The neoplastic cells are forming papillae; however, there is no evidence of tissue invasion. (Copyright © McGraw-Hill Education)

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from article Blood vessel

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Blood vessels carry blood through the tissues and organs of the body. Blood flow is fastest through vessels with the smallest cross-sectional area (for example, the aorta or vena cava). (Copyright © McGraw-Hill Education)

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from article Mosaicism

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Chromosomal mosaicism. (a) Normal mitosis with two pairs of homologous chromosomes. (b) Somatic nondisjunction resulting in aneuploid daughter cells: one bears an additional chromosome (trisomy) and the other lacks one chromosome (monosomy). (c)…

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from article Mosaicism

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Mitotic recombination. (a) Mitosis produces daughter cells with a genotype identical to that of the mother cell. (b) After mitotic recombination, the daughter cells become homozygous for the marker mutations a and b, and the progeny of these cells…

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from article Mosaicism

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A twin spot from a wing of Drosophila melanogaster, formed after x-ray-induced mitotic recombination. Letters a and b indicate separate clones of cells showing different mutant phenotypes; the background tissue shows the normal phenotype. (Photo by…

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from article Textile microbiology

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Stages of deterioration of cotton fiber under influence of fungi. (a) Normal fibers. (b, c) Fungal hyphae growing on the outside of the fiber (shown by arrows). (d) Fungal hyphae growing in the lumen of the fiber. (e, f) Fibers showing excessive and…

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from article Textile microbiology

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Two growth stages of cellulose bacteria (Sporocytophaga myxococcoides) on cotton fiber. (a) Initial stage. (b) Final stage. (From A. N. J. Heyn, Textile Res. J., 27:591–602, 1957)

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