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Regeneration e Black & White Stock Photos
RMRE02NJ–. A text book of veterinary pathology, for students and practitioners. Veterinary pathology. 162 VETERI-XARV PATH(iLU(;y. duce inflammation, and necrotic areas are usually surrounded by an inflammatorv zone. Inflammation is confined to the reactiA-e process of the injured cells and should not be confused with the death of the cells or necrosis. Degeneration and regeneration are distinctly opposite pro- cesses. The former is destructive, resulting in impairment and death, Avhile the latter is constructive, resulting in overgrowth and proliferation. Degeneration is caused by insufficient food, i
RMRE065Y–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). Beain Physiology op Worms 347. FIG. 98 Schrader has found that a frog is possessed of an irresistible impulse to move after losing this center.' The simplest facts of comparative physiology show more- over that the power of progressive movement is possessed also by such organisms which have no brain whatever, ('. e., the swarm spores of Algse. It is, in my opinion, not the problem of physi- ology to find a definition for an organ but to discover the functions of a given or
RMRE02ND–. A text book of veterinary pathology, for students and practitioners. Veterinary pathology. INFLAMMATION. 165 result of chronic inflammation. The lowest types of tissues 1. e., those passive in function, are most easily and most fre- quently regenerated, e. g., connective tissue. 'Surface epithe- lium is frequently regenerated—muscular and nervous tissue- » » « ». An ^ .'K,-. 100.—Clirnnic Hepatitis, sh-'win^ intialobural iibruus formation, whicli results in tiypertropliic cirrliosis. are rarely regenerated. The age of the individual is an im- portant factor in the regeneration of injured tis
RMRDY337–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). Artificial Peoduction of Noemal Laev^e 611 of the irregular morula stage is preserved. This is intel- ligible if we remember that the blastula originates through the cleavage cells moving or sticking to the periphery of the egg. The other blastulfe represented only smaller pieces of a single egg. In some cases one part of the egg disintegrated and formed debris at- tached to the other part which reached the blas- tula stage (5, 6, and 7). Each one of these blas- tulse was
RMRE0AAP–. General physiology; an outline of the science of life. THE MECHANISM OF LIFE 543 been irremediably injured in the division, regeneration is no longer possible, because the necessary molecules and atoms are no longer produced and brought to the necessary place. Hence it is a universal and fundamental fact that non-nucleated pieces of a cell, i.e., pieces into which a fatal disturbance of metabolism has come, do not regenerate lost parts, although under certain circum- stances they are able to live for days. One phenomenon, which some years ago appeared verj^ puzzling, is approximately explain
RMRDY31E–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). OkGANIZATION and GrEOWTH 199 orientation of Antennularia toward the center of the earth are not exhausted by what has been said in the foregoing. It is possible to cause the growing tip of the stem to cease its growth and develop into a root. This is done by invert- ing the tip. I cut long pieces from the stems of Antennu- larise and hung them vertically in the aquarium, but in an inverted position. A rapidly growing stem was formed at the upper—that is to say, the basal—e
RMRE02MC–. A text book of veterinary pathology, for students and practitioners. Veterinary pathology. 178 VUCI1£RIX.R- PAIIIOLOUW kidney. The law of specificity, i. e., cells beget like cells, is the same in regeneration and in ph vsiologic processes. Regen- eration is the outcome of the unhindered multiplication of cells. Blood is continually regenerated during the natural life of an animal. The normal maintenance of blood is a physiologic pro- cess, but regeneration of blood or some of its constituents may, under certain conditions, be al^normal, as in leukemia. Leuco- cytes are produced in lymphoi
RMRE062E–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). FIG. 118 boid pseudopodia. A few minutes later all of the cells sent out such pseudopodia, which soon became shorter, however, as if the substance of the pseudopodia had been torn, e. g., through an emulsion (Fig. 120). The outlines of the germ then again became smooth, but not entirely so (Pig. 121), and finally the blastoderm gradually disappeared (Fig. 122). The entire series of changes shown in Figs. 118-22 took about forty- five minutes. Besides these changes, another
RMRDY2YB–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 268 Studies in General Physiology Nor do the animals collect at D on the room side of the dish, but rather at E. The movements, therefore, occur in the direction of the rays of light. If the experiment is to be demonstrated to others, a shadow may be thrown into the vessel by a rod, in which case one can see directly that the animals move parallel to the shadow. Attention need scarcely be called to the fact that if rays of light strike the animal simultaneously from variou
RMRE062K–. Studies in general physiology. Physiology; Phototropism; Geotropism; Reproduction; Irritability; Regeneration (Biology). 394 Studies in General Physiology. FIG. 118 boid pseudopodia. A few minutes later all of the cells sent out such pseudopodia, which soon became shorter, however, as if the substance of the pseudopodia had been torn, e. g., through an emulsion (Fig. 120). The outlines of the germ then again became smooth, but not entirely so (Pig. 121), and finally the blastoderm gradually disappeared (Fig. 122). The entire series of changes shown in Figs. 118-22 took about forty- five minu
RMRDE98J–. Studies in French forestry . Forests and forestry. Fig. 6 {d to/). — State forest of Hez-Froidmont. (d — top left) Appearance after seed felling is completed; (e — top right), (/—bottom) Secondary felling showing regeneration secured by seed felling. The advance growth in the background will be cut back, so as to assure an even-aged stand. 59. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Woolsey, Theodore Salisbury, 18
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