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Author :
Publisher :
ISBN 13 :
Total Pages : 752 pages
Book Rating : 4.:/5 ( download)
Download or read book Morphologie Et Embryologie written by and published by . This book was released on 1994 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Library of Medicine (U.S.)
Publisher :
ISBN 13 :
Total Pages : 1118 pages
Book Rating : 4.:/5 (31 download)
Download or read book Index of NLM Serial Titles written by National Library of Medicine (U.S.) and published by . This book was released on 1979 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt: A keyword listing of serial titles currently received by the National Library of Medicine.
Author : Finn-Mogens Smejda Haug
Publisher : Springer Science & Business Media
ISBN 13 : 3642515851
Total Pages : 71 pages
Book Rating : 4.6/5 (425 download)
Download or read book Heavy Metals in the Brain written by Finn-Mogens Smejda Haug and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of transition metals and group II b metals in biological reac tions is becoming increasingly clear. Such metals form an integral part of the structure of many enzymes and non-enzymic proteins and also feature in more reversible interactions between metal ions and large or small biological molecules (Johnson and Seven, 1961). As discussed at the end of this paper, chemical analyses have shown the presence of these metals in the central nervous system and some hypotheses have been advanced concerning their role in more specific nervous activities such as synaptic processes. In order to define more precisely the role of these trace metals it is clearly necessary to investigate their regional and cytological distribution, as may be achieved by the use of histochemical methods. Some of the earliest neurohistochemical studies were concerned with trace metals, especially iron, in the brain (Spatz, 1922). Later reports on the localiza tion of trace metals have been comparatively few, except as regards the hippo campal region. Maske's report (1955) that intravital injections of the coloured chelating agent, dithizone, revealed an accumulation of zinc within the hippocampus, prompted aseries of investigations by Fleischhauer and Horstmann (1957), Timm (1958a), McLardy (1960, 1962, 1963, 1964), von Euler (1962), and others, in which the intravital dithizone method or Timm's sulphide silver method was used. As a result, particularly intense staining was found to correspond to the zones receiving mossy fibre terminals (Cajal, 1911; Blackstad et al., 1970).
Author : H. Aldskogius
Publisher : Springer Science & Business Media
ISBN 13 : 3642658679
Total Pages : 78 pages
Book Rating : 4.6/5 (426 download)
Download or read book Indirect and Direct Wallerian Degeneration in the Intramedullary Root Fibres of the Hypoglossal Nerve written by H. Aldskogius and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the previous study (Part I) a description was given of the ultrastructural changes occurring during indirect Wallerian degeneration in the intramedullary root fibre region of the kitten hypoglossal nerve. One of the striking features of this degeneration process was the appearance at an early stage of micro glial cells completely covered by myelin, which apparently participated in phago cytosis of degenerating axoplasm and to a small extent of their own myelin covering. Evidence was obtained indicating that the numerous degenerating glial cells seen somewhat later in the degeneration process were derived from these myelin-covered microglial cells. Since glial cells of the type described in the previous study have never been implicated in the process of direct Wallerian degeneration, the possibility exists that they may in fact be characteristic for indirect Wallerian degeneration. However, this possibility cannot be adequately assessed unless our present rather scanty knowledge concerning the early glial reaction during direct Wallerian degeneration is extended. Therefore the present study has been undertaken to examine the ultrastructural changes during direct W allerian degeneration in the kitten, with particular reference to the possible occurrence of myelin-covered microglial cells and degenerating glial cells of the type described in the previous study (see Part I). Since no systematic ultra structural study on direct Wallerian degeneration in immature animals seem to exist, observations on changes in the myelinated nerve fibres and the different types of glial cells have been included.
Author : J. Kartenbeck
Publisher : Springer Science & Business Media
ISBN 13 : 3662103907
Total Pages : 55 pages
Book Rating : 4.6/5 (621 download)
Download or read book The Nuclear Envelope in Freeze-Etching written by J. Kartenbeck and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the past twenty years the structure of the nuclear envelope, and in particular, that of its most distinct elements, the nuclear pore complexes, has been described from thin section electron microscopy (e, g., Brettschneider, 1952; Hartmann, 1953; Bahr and Beermann, 1954; Watson, 1954; Kautz and de Marsh, 1955; Watson, 1955), from metal-shadowed (e. g., Callan and Tomlin, 1950; Gall, 1954, 1956) and negatively stained (e. g., Franke, 1966, 1967; Gall, 1967; Yoo and Bayley, 1967) preparations of isolated nuclear membranes as revealing characte ristics common to euka. ryotic cells in general (recently reviewed, e. g., in Gouran ton, 1969; Stevens and Andre, 1969; Franke, 1970). In the recent years the freeze-etch technique (Steere, 1957) has proved to be a particularly useful tool in studying membraneous structures (e. g., Moor and Miihlethaler, 1963; Branton and Moor, 1964; Branton, 1966; Koehler, 1968b; Staehelin, l968a; Northcote, 1968a; Branton, 1969; Moor, 1969a). So this method has especially broadened the knowledge, e. g., on bacterial membranes (Bayer and Remsen, 1970; Nanninga, 1970), on erythrocyte plasma membranes (Weinstein and Bullivant, 1967; Meyer and Winkelmann, 1970; da Silva and Branton, 1970; Tillack and Marchesi, 1970), on liver cell membranes (Chalcroft and Bullivant, 1970), on Golgi membranes (Werz and Kellner, 1970; Staehelin and Kiermayer, 1970), on synaptic vesicles (Moor et al.
Author : Z. Halata
Publisher : Springer Science & Business Media
ISBN 13 : 3642454658
Total Pages : 77 pages
Book Rating : 4.6/5 (424 download)
Download or read book The Mechanoreceptors of the Mammalian Skin Ultrastructure and Morphological Classification written by Z. Halata and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whilst most of the senses (hearing, sight, smell and taste) have their own organs, the tactile sense is dependent on the sensory nerve endings of the periph eral processes of the nerve cells in the spinal ganglia. These nerve endings are distributed over the entire body. They vary in number and structure according to the nature of the tissue. For instance, the quantitative innervation of the mucosa differs from the innervation of the periosteum or the articular capsules. The skin and its related tissues are relatively richly innervated, but here too there are regional differences. Some areas, such as the skin of the back, have relatively few nerve endings, whilst other parts (e.g. the skin of the fingers) are richly innervated. Most authors describe the nerve endings systematically from the surface of the epidermis to the lower layers of the dermis. On the basis of the topographical criteria, we differentiate between epidermal and dermal nerve endings.
Author : G.D. Das
Publisher : Springer Science & Business Media
ISBN 13 : 3642866549
Total Pages : 60 pages
Book Rating : 4.6/5 (428 download)
Download or read book Evaluation of Interstitial Nerve Cells in the Central Nervous System written by G.D. Das and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of nerve cells in the white matter of the spinal cord and in the spinal and cranial nerves has attracted the attention of some researchers in the past. Because of their location in such unexpected regions, these neurons provided a rich field of speculation regarding their nature and function. This was partic ularly true about the nerve cells lying in the spinal white matter. From phylogenetic considerations, neurons in the spinal white matter are present more abundantly in amphibians, reptiles and brids than in mammals. A. brief survey of literature on lower vertebrates indicates that GASKELL (1885, 1889) was the first to describe the displaced neurons in the white matter of the spinal cord of alligators and various species of birds. In his consideration they were displaced ganglion cells. In 1902 von KOELLIKER gave an exhaustive account of such neurons in the white matter of the spinal cord of reptiles and birds. In these animals he observed clusters of such neurons running in longitudinal columns and thus was able to group them into nuclei known as "Hofmann's nuclei". Further, he suggested that these nuclei arise from the mass of the ventral horn and that they may give rise t. o preganglionic fibers, motor fibers or ventral commissural fibers. In t. he ensuing years investigation of these nuclei was extended by STREE TER, KRAUSE, TERNI, HUBER and others (quoted from ARIENS KAPPERS et. aI. , 1960, Vol. I, p. 206-210).
Author : E. Ramon-Moliner
Publisher : Springer Science & Business Media
ISBN 13 : 3642500552
Total Pages : 53 pages
Book Rating : 4.6/5 (425 download)
Download or read book Acetylthiocholinesterase Distribution in the Brain Stem of the Cat written by E. Ramon-Moliner and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The earliest studies on the regional distribution of acetylcholinesterase (AChE) within the central nervous system were based on the determination of the amount of CO liberated by homogenates of selected areas in the presence of an ester of 2 choline and a bicarbonate buffer. Using this biochemical approach, Burgen and Chipman (1951) were able to establish that acetylcholinesterase is not evenly distributed within the central nervous system. They found that the cerebellum, the lateral geniculate body, and the striatum contained a high concentration of AChE. The high concentration of AChE in the striatum could be correlated with a higher rate of acetylcholine synthesis. However, this was not the case for the cerebellum, where acetylcholine synthesis was very low. Other in vitro studies have been aimed at establishing the regional distribution of the other two components of the cholinergic system, cholinacetylase (ChA) and acetylcholine (ACh). An equally asymetrical distribution for these substances has been established in vitro (MacIntosh, 1941 ; Feldberg and Mann, 1946; Feldberg and V ogt, 1948; MacIntosh and Oborin, 1953; Quastel, 1962; Mitchell, 1963; Krnjevic and Phillis, 1963; Aprison et al., 1964; McLennan, 1964; Cohen, 1956). The in vitro determination of acetylcholinesterase (Koelle, 1950; Burgen and Chipman, 1951; Giacobini, 1959; Bennett et al., 1966; Fahn and Cote, 1968; Miller et al., 1969) presents the advan tage of permitting the use of a substrate like ACh which is a normally occurring ester of choline so that the establishment of enzyme specificity is less questionable.
Author : K.F. Baker-Cohen
Publisher : Springer Science & Business Media
ISBN 13 : 3642859410
Total Pages : 72 pages
Book Rating : 4.6/5 (428 download)
Download or read book Comparative Enzyme Histochemical Observations on Submammalian Brains written by K.F. Baker-Cohen and published by Springer Science & Business Media. This book was released on 2013-12-14 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparative neurological studies of the evolutionary development of struc tures within the central nervous system of vertebrates have depended to a large extent upon morphological rather than functional criteria. Classical comparative anatomical studies, which have attempted to demonstrate homologies between parts of the brain in representatives of different vertebrate classes may be grouped under three general headings: 1. comparison of the embryological development of brain structures; 2. comparison in adult forms of the topographical relations of neuron groupings and fiber tracts, and of the morphology of cell types ( cyto architectonics); and 3. analysis and comparison of fiber connections between particular cell groupings or regions. Of these three, the third encompasses func tional relationships most directly, but even in well-defined fiber tracts the direction of conduction often remains indefinite, and the extent and activity of more diffuse systems is poorly known. In recent years a nurober of investigations applying electrophysiological and degeneration methods to submammalian forms have been reported. Those most pertinent to the present studies include the papers of . ARMSTRONG et al. (1953), KRUGERand associates (e. g. HERIC and KRUGER, 1966; KRUGERand BERKOWITZ, 1960; PowELL and KRUG ER, 1960}, GusEL'NIKov and SUPIN (1964) and KARA MYAN and BELEKJIOVA (1964) on various reptiles, and of PowELL and CowAN (1961), KARTEN and REVZIN (1966) and REVZIN and KARTEN (1967) on the pigeon.
Author : P. Cau
Publisher : Springer Science & Business Media
ISBN 13 : 3642663346
Total Pages : 67 pages
Book Rating : 4.6/5 (426 download)
Download or read book Morphogenesis of Thyroid Follicles in Vitro written by P. Cau and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thyroid gland first appears in the phylogenic scale in the Lamprey larva, Ammocoetes, at the time of metamorphosis (see review by Constantinescu, 1972). In higher Vertebrates the adult thyroid gland consists of vesicles i. e. thyroid follicles containing colloid and lined with a cubic or prismatic epithelium. Since the end of the 19th century, many authors have studied the morphoge nesis of the follicles during the embryonic and fetal development of the gland in Man and other species, principally Chick, Rat and Rabbit. The development of techniques for culturing organs of higher animals, in particular the thyroid by Carrel and Burrows (1910) and Champy (1914, 1915), allowed the study of the survival in vivo or in vitro of grafts or explants of thyroid gland obtained from adult or fetal animals. In addition to organotypic cultures, techniques for culturing cell suspensions obtained by enzymatic dissociation have recently been refined. Moreover, histological examination of pathological human glands and adult thyroids experimentally stimulated by thyrotropin hormone (TSH) has provided additional data for the understanding of thyroid follicle morphogenesis.
Author : National Library of Medicine (U.S.)
Publisher :
ISBN 13 :
Total Pages : 1170 pages
Book Rating : 4.3/5 (91 download)
Download or read book National Library of Medicine Current Catalog written by National Library of Medicine (U.S.) and published by . This book was released on 1971 with total page 1170 pages. Available in PDF, EPUB and Kindle. Book excerpt: First multi-year cumulation covers six years: 1965-70.
Author : National Library of Medicine (U.S.)
Publisher :
ISBN 13 :
Total Pages : 212 pages
Book Rating : 4.3/5 (91 download)
Download or read book List of Journals Indexed in Index Medicus written by National Library of Medicine (U.S.) and published by . This book was released on 1989 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1977-1979 include also Special List journals being indexed in cooperation with other institutions. Citations from these journals appear in other MEDLARS bibliographies and in MEDLING, but not in Index medicus.
Author : I.R. Phillips
Publisher : Springer Science & Business Media
ISBN 13 : 3642664962
Total Pages : 47 pages
Book Rating : 4.6/5 (426 download)
Download or read book The Embryology of the Common Marmoset written by I.R. Phillips and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primates represent a diverse group with the phylogenetic relationships of the var ious species reflected in their early embryonic development. The members of the Tupaiidae, Lemuridae and Lorisidae show great similarities to the lower mammals and even birds. The Tarsiidae represent an intermediate step and the Platyrrhini and Catarrhini exhibit the greatest similarities to man. During the period of embryogenesis, the dimensions of an embryo are insufficient guide to its age and much more reliable information can be derived from a study of its external form and internal structure. Examination of embryological specimens from a variety of simian species dates back to the early 1900's but much of this material was collected in a haphazard way from animals shot in the wild. Heuser and Streeter (1941) depicted a series of embryos of the rhesus monkey (Macaca mulatta) and correlated their gestational age with external form and size. Streeter (1951) arranged human em bryos, between 24. ± 1 and 47. ± 1 days of post-ovulation age, into age groups or devel opmental horizons based on their external form and internal structure. Each horizon was two days apart and numbered XI to XXIII. The transition from embryo to fetus occurred at the end of horizon XXIII and was arbitrarily dermed as the point where bone marrow invaded the cartilaginous precursor in the humerus. The earlier stages I-X have been dermed subsequently, (Heuser and Corner, 1957; O'Rahilly, 1973).
Author : P. Kaufmann
Publisher : Springer Science & Business Media
ISBN 13 : 3642666183
Total Pages : 93 pages
Book Rating : 4.6/5 (426 download)
Download or read book The Guinea-Pig Placenta written by P. Kaufmann and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The placenta of the guinea-pig has assumed exceptional importance among the discoidal hemochorial placentae since the end of the sixties. Up to that date, numerous studies had been published on the functional analysis of the human placenta. One shortcom ing common to all these studies, however, was the fact, that the human placenta was not absolutely suitable for morphological research, owing to fIxation difficulties, and for experimental investigations virtually unsuitable. Since other hemochorial villous placentae, like that of the anthropoid apes (primates) were practically unobtainable, a possible alternative was sought among the I;tcunal placentae. The numerous studies on the guinea-pig placenta undertaken at the turn of the century favoured the choice of this organ as it also belonged to the discoidal hemochorial type, like that of man. The fact that its structure was not villous but lacunal and therefore showed a different cir culation seemed even advantageous in this case. The lacunal system facilitates differen tiation in morphologically distinct areas, which allow independent functional analysis. The morphological and histochemical studies made during the past decade by Enders (1965), Vollrath (1965), Miiller and Fischer (1968), Kaufmann (1969a), Davidoff and Schiebler (1970a, b), King and Enders (1970b, 1971), Davidoff and Gospodinoff (1971), Davidoff (1973), Kaufmann (1974) have led to the discovery of a large amount of new information on this organ, thus rendering it one of the most precisely examined placentae so far.
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Publisher :
ISBN 13 :
Total Pages : 804 pages
Book Rating : 4.:/5 (319 download)
Download or read book Cumulated Index Medicus written by and published by . This book was released on 1978 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 884 pages
Book Rating : 4.:/5 (31 download)
Download or read book Energy Data Base written by and published by . This book was released on 1984 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. Hauglie-Hanssen
Publisher : Springer Science & Business Media
ISBN 13 : 3642999344
Total Pages : 106 pages
Book Rating : 4.6/5 (429 download)
Download or read book Intrinsic Neuronal Organization of the Vestibular Nuclear Complex in the Cat written by E. Hauglie-Hanssen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
