摘要:

AbstractThe incorporation of digitonin 0.2% w/v in cacodylate buffered glutaraldehyde reduces the amount of cholesterol extracted in the dehydrating (lipid extracting) solutions. The fixative enhances membrane structure and results in the preservation of a double minor period in peripheral myelin. The periodicity obtained is in agreement with those derived from x‐ray diffraction studie

ISSN:0003-276X    

DOI:10.1002/ar.1091630101

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractIn myelin of peripheral nerves it is shown that the intermediate dense line is split after aldehyde fixation (with uranium post‐treatment) with a 20 Å gap intervening between the apposed outer leaflets of the Schwann cell membrane. This gap is permeable to colloidal lanthanum, which indicates that it is continuous with the extracellular space. Our observations are discussed in light of data of other investigato

ISSN:0003-276X    

DOI:10.1002/ar.1091630102

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractPlacentomes from 12 cows ranging from about 45 days of gestation to full term were studied with light and electron microscopy. The cryptal epithelium and the trophoblast both comprised uninucleate, binucleate and multinucleate cells. The uninucleate cryptal cells were provided with small mitochondria and essentially rough‐surfaced endoplasmic reticulum of varying appearance. The uninucleate trophoblastic cells were characterized by an abundance of mitochondria and by morphological evidence of absorption (pinocytosis and phagocytosis). Mitotic figures and sites with cellular degeneration were frequent on the cryptal side but less so on the trophoblastic side. It is concluded that cell turnover is rapid, being confined mainly to the cryptal cells. This is a process in the continuous growth and remodelling of the placentome. There is morphological evidence that the degenerated cells are absorbed by the trophoblas

ISSN:0003-276X    

DOI:10.1002/ar.1091630103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractUsing rat's circumvallate papillae, ATPase, alk. Pase and acid Pase of taste buds were observed after the transection of the glossopharyngeal nerve.The taste buds began to disappear after the nerve was cut and were completely lost after ten days. Following the regeneration of the glossopharyngeal nerve, taste buds reappeared from the bottom of the gutters of circumvallate papillae about 25 days after the operation.ATPase was strongly present on the cell membrane of taste bud cells as far as they existed during degeneration and regeneration. Alk. Pase, which is normally localized on the superficial layers of the epithelium overlying the gutters of circumvallate papilla, gradually diminished as the taste buds degenerated and reappeared as the taste buds regenerated; that is, the activity began to diminish three days after the operation, became feeble after ten days and reappeared after 25 days. It is concluded that taste bud cells secrete alk. Pase in the gutters of circumvallate papillae. Acid Pase activity, usually found in the supranuclear portion of taste bud cells, was intensely reactive during degeneration but did not reappear at the early stage of regeneration of taste bud cells.

ISSN:0003-276X    

DOI:10.1002/ar.1091630104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractAttention is directed toward the occurrence of fenestrations or pores in Golgi cisternae of rat and mouse epididymis. There is a gradation in the degree of cisternal fenestration within a Golgi complex. Cisternae at the convex pole are highly flattened and contain few pores, but those near the concave side are distended and exhibit a large number of roughly circular fenestrations 300–600 Å in diameter. Cisternae in the middle of a stack often have an unperforated central portion that is surrounded by a fenestrated and expanded peripheral region. The structure of these Golgi complexes is compared with previous descriptions of Golgi cisternae, particularly the fenestrated cisternae reported in plant cel

ISSN:0003-276X    

DOI:10.1002/ar.1091630105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractRed blood cell count and haemoglobin content for blood of normal adult salamanders,Taricha granulosa, are presented. The RBC count is some 4 × 104/mm3blood and the haemoglobin level some 4.5 gm/100 ml blood. Some evidence suggesting transient changes in these levels for a brief period immediately following hibernation is discussed

ISSN:0003-276X    

DOI:10.1002/ar.1091630106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractIn the human fetal spinal cord, enzymatic activity is demonstrated in neurons of the anterior horn a few weeks before it appears in neurons of the posterior horn. This enzymatic activity is present first in the lumbar segment of the spinal cord and with advancing time gradually ascends cephalad. The presence of acetyl‐cholinesterase activity in neuronal cytoplasm in the lumbar segment of the spinal cord coincides with the earliest detectable movement in the lower limb

ISSN:0003-276X    

DOI:10.1002/ar.1091630107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractThe endosteal and periosteal diameters of the second metacarpal were measured at the midshaft on radiographs of 62 normal girls at 11.0 ± 0.5 years (pre‐menarche) and again at 16.0 × 0.5 (post‐menarche). There was an average increase in the periosteal diameter of 10% and an average decrease in the endosteal diameter of 16%, both changes significant at p<0.01. Individual variability was greater for the endosteal than the periosteal surface changes (p<

ISSN:0003-276X    

DOI:10.1002/ar.1091630108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractThe capillary network of the papillary layer of the enamel organ was studied with the electron microscope. Mandibular incisor teeth of ten‐day old Swiss albino mice were fixed in formaldehyde‐glutaraldehyde, postfixed in osmium tetroxide and prestained with 0.5% uranyl acetate prior to being embedded in Epon. Examination of ultrathin sections revealed the presence of fenestrations approximately 500 Å to 700 Å in diameter within the most attenuated regions of the capillary walls. In most instances the fenestrations appeared to be closed by diaphragms usually consisting of a thin membrane with a thicker centrally located button of electron opaque material.The presence of fenestrated capillaries within the papillary region of the enamel organ lends further support to the concept that papillary cells are engaged in transport functions during the maturation of e

ISSN:0003-276X    

DOI:10.1002/ar.1091630109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY

摘要:

AbstractThe distribution of intrarenal nervous tissue in a number of species has been examined using a cholinesterase technique. Particular attention has been paid to the relationships between the renal vessels and their nerves. Nerves were detected alongside the major intrinsic renal vessels and formed nerve networks on the external aspects of the arterial tunicae mediae. In all specimens, afferent arterioles were accompanied by nerves the majority of which terminated near the entrance of cortical afferent arterioles into their respective glomeruli; nerves along juxtamedullary afferent arterioles continued across glomerular hila. Relatively few nerves were demonstrated near cortical efferent arterioles while juxtamedullary efferent vessels possessed a rich innervation. Intramural smooth muscle was identified in juxtamedullary efferent arterioles, aglomerular vessels and arteriolae rectae and these vascular segments were accompanied by nervous tissue. Cholinesterase positive nerves could not be detected in the renal medulla.

ISSN:0003-276X    

DOI:10.1002/ar.1091630110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1969

数据来源: WILEY