Wiley
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Unbiased stereological estimation of the total number of neurons in the subdivisions of the rat hippocampus using the optical fractionatorAbstract A stereological method for obtaining estimates of the total number of neurons in five major subdivisions of the rat hippocampus is described. The new method, the optical fractionator, combines two recent developments in stereology: a three‐dimensional probe for counting neuronal nuclei, the optical disector, and a systematic uniform sampling scheme, the fra... ... hiện toàn bộ
Wiley - Tập 231 Số 4 - Trang 482-497 - 1991
Cross‐sectional internal diameters of human cervical and femoral blood vessels: Relationship to subject's sex, age, body sizeAbstract Cross‐sectional internal diameter measurements were made of right and left common carotid and right femoral arteries and right and left internal jugular, superficial femoral, and common femoral veins in 32 normal human subjects utilizing duplex ultrasonography. The relationships of these vessel sizes to the subject's sex, age, height, weight, and body surfa... ... hiện toàn bộ
Wiley - Tập 226 Số 1 - Trang 115-124 - 1990
Ability of neural crest cells from the embryonic chick to differentiate into cartilage before their migration away from the neural tubeAbstract Whether neural crest cells from the avian embryo are determined for chondrogenesis before they begin their migration away from the neural tube (i.e., before H. H. stages 8.5‐9) was investigated by establishing neural folds from embryos of H. H. stages 5‐11 either in organ culture, or as grafts to the chorioallantoic membranes of host embryos. Cartilage diff... ... hiện toàn bộ
Wiley - Tập 194 Số 3 - Trang 469-475 - 1979
Cytological effects of salt‐stress and localization of transport adenosine triphosphatase in the lateral nasal glands of the desert iguana, Dipsosaurus dorsalisAbstract Each of the bilateral nasal glands of Dipsosaurus is surrounded by a thin cartilagenous capsule. A short excretory duct leads to the vestibule of the nasal cavity. This duct connects with the branched principal secretory tubules that end in small terminal segments. Tall columnar cells line the principal secretory tubules, but muco... ... hiện toàn bộ
Wiley - Tập 180 Số 2 - Trang 285-297 - 1974
Germ cell degeneration in normal and microwave‐irradiated rats: Potential sperm production rates at different developmental steps in spermatogenesisAbstract Germ cell degeneration in 14 normal and 14 microwave‐irradiated, adult (400–500 gm), Sprague‐Dawley rats was compared by evaluating potential sperm production rates at different developmental steps in spermatogenesis. Following 9 days of irradiation at 1.3 GHz (6 hours/day at 6.3 mW/gm using 1‐μsec pulsewidth at 600 pulses/second) or sham treatment, rats we... ... hiện toàn bộ
Wiley - Tập 209 Số 4 - Trang 501-507 - 1984
Rapid neuromuscular remodeling following limb immobilizationAbstract The effect of immobilization on endplate morphology of the rat soleus muscles was studied qualitatively and quantitatively. The endplate was visualized by light microscopic zinc iodide osmium (ZIO) staining and by electron microscopy. The soleus muscle was immobilized by pinning of ankle and knee joints at right angles for 5 days. Immobilized muscles were t... ... hiện toàn bộ
Wiley - Tập 224 Số 1 - Trang 102-109 - 1989
Nuclear shaping in spermatids of the Thai leaf frog Megophrys montanaAbstract Transmission electron microscopy of Thai leaf frog testis revealed a unique pattern of spermatid nuclear morphogenesis. Chromatin condenses into a continuous cylindrical coil within a roughly spherical nucleus. Later the nuclear membrane conforms to the contours of the uncoiling nuclear contents. In the mature sperm, the long, tapering nuclesus is helically... ... hiện toàn bộ
Wiley - Tập 220 Số 3 - Trang 287-290 - 1988
Daily leukocyte rhythms in normal and hypophysectomized rats exposed to different environmental light‐dark schedulesAbstract With environmental factors rigidly standardized, Sprague‐Dawley rats were maintained under the following lighting schedules: (1) artificial light 0600 to 1800 alternating with 12 hours of darkness‐LD, (2) reversal of the above‐DL, (3) constant darkness‐DD, and (4) constant illumination‐LL. During each regimen, both total and differential whi... ... hiện toàn bộ
Wiley - Tập 153 Số 4 - Trang 349-360 - 1965
Bone “mass” and the “mechanostat”: A proposalAbstract The observed fit of bone mass to a healthy animal's typical mechanical usage indicates some mechanism or mechanisms monitor that usage and control the three longitudinal growth, bone modeling, and BMU‐based remodeling activities that directly determine bone mass. That mechanism could be named a mechanostat. Accumulated evidence suggests it includes the bone... ... hiện toàn bộ
Wiley - Tập 219 Số 1 - Trang 1-9 - 1987
Electron microscopy after rapid freezing on a metal surface and substitution fixationAbstract A method for rapid freezing is described in which use is made of the good heat conducting properties of silver. The freezing was accomplished by bringing the tissue in contact with a polished silver surface at the temperature of liquid nitrogen either at atmospheric or reduced pressure. Helium gas flowing over this surface prevented the condensation of wate... ... hiện toàn bộ
Wiley - Tập 149 Số 3 - Trang 381-385 - 1964
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