Search results for " Microscopic"

Elektronenmikroskopische Untersuchungen zur Capillarhyper�mie in der stimulierten Goldhamsterschilddr�se

1966

Untersuchungen an 32 kalte- bzw. thyreotropinaktivierten Goldhamsterschilddrusen unter Vergleich mit den Glanduale thyreoideae 8 normaktiver Tiere ergaben: 1. Mit einsetzender Kolloidmobilisation werden oberhalb der lichtoptisch erkennbaren Basalmembran der Follikel gelegene, intraepitheliale Capillaren entfaltet. 2. Am Endothel dieser intraepithelialen Capillaren treten hierbei breitere Poren auf, die jedoch durch ein Diaphragma verschlossen bleiben (Endothelfenster). Anscheinend erfolgt ferner ein cytopemptischer Transport von Material aus dem erweiterten periendothelialen Spalt in Richtung Saftestrom. 3. In der Nachbarschaft aktivierter Thyreocyten, insbesondere wenn letztere Anzeichen e…

Prenatal Ultrastructural Diagnosis in the Neuronal ceroid-lipofuscinoses

1994

Summary The neuronal ceroid-lipofuscinose (NCL) are autosomal-recessive disorders in childhood of unknown enzymatic origin. They can be recognized by the presence of abnormal lipopigments identified by electron microscopy. Based on the study of circulating lymphocytes, individual clinical subtypes of NCL can be correlated. Prenatal diagnosis of NCL with the electron microscope is now feasible for the infantile (Finnish) from (INCL) and late-infantile form (LINCL). INCL-specific granular lipopigments are present in endothelial cells of biopsied chorion stroma vessels of homozygously affected fetuses. In LINCL, disease-typical curvilinear bodies can be identified in uncultured amniotic fluid …

Elektronenmikroskopische Studien �ber eine extrazellul�r auftretende Substanz in der Muskulatur des Insekts Oncopeltus fasciatus Dallas

1973

Im Stroma von Aorta und Retrocerebralkomplex sowie von verschiedenen Muskeln (Oberschenkel-, Mitteldarm-, Speicheldrusen-, Samenleiter- und Eileitermuskeln), jedoch nicht im Stroma der Flugmuskulatur und des Herzschlauches, kommt eine fibrillar strukturierte Substanz (X-Substanz) von auserordentlich hoher Elektronendichte vor.

�ber den Feinbau der Schwimmblase von Anguilla vulgaris L.

1961

Histochemical and electron microscopic analysis of spiculogenesis in the demosponge Suberites domuncula.

2006

The skeleton of demosponges is built of spicules consisting of biosilica. Using the primmorph system from Suberites domuncula, we demonstrate that silicatein, the biosilica-synthesizing enzyme, and silicase, the catabolic enzyme, are colocalized at the surface of growing spicules as well as in the axial filament located in the axial canal. It is assumed that these two enzymes are responsible for the deposition of biosilica. In search of additional potential structural molecules that might guide the mineralization process during spiculogenesis to species-specific spicules, electron microscopic studies with antibodies against galectin and silicatein were performed. These studies showed that …

Osteogenesis imperfecta and hyperplastic callus formation: light- and electron-microscopic findings.

1993

In rare cases of osteogenesis imperfecta, an "overshoot" growth of new bone may occur, which, clinically gives the impression of a tumour. This condition is known as hyperplastic callus formation. Morphology showed an excessive mixed desmal-chondral osteoneogenesis. Atypical collagen fibrils in non-callus tissue represent an indicator for this callus formation in individual patients.

Mesoscopic organization in ionic liquids.

2017

We discuss some published results and provide new observations concerning the high level of structural complexity that lies behind the nanoscale correlations in ionic liquids (ILs) and their mixtures with molecular liquids. It turns out that this organization is a consequence of the hierarchical construction on both spatial (from ångström to several nanometer) and temporal (from fraction of picosecond to hundreds of nanosecond) scales, which requires joint use of experimental and computational tools. © 2017, Springer International Publishing Switzerland.

Histochemistry of the Mitochondrial System

1964

It has been customary to introduce any discussion on the mitochondrion by summing up its functions as the energy center of the cell. Because of the extensive reviews and symposia in this field in recent years such an introduction would be repetitious and will therefore be omitted. — The relative ease by which mitochondria can be isolated from various cells and the considerable purity of such fractions permitted an analysis of the overall functions of mitochondria and the extrapolation of these results, on a statistical basis, to a single mitochondrion. Further fragmentation of isolated mitochondria into sub-units that carry segments of the functional activity of the whole organelle signific…

Investigation of the superstructure of native collagen by a combination of small angle X-ray scattering, electron microscopy and light diffraction

1978

It is shown that there exists a direct correlation between the light diffraction pattern of an electron-microscopical picture and the X-ray small angle scattering. By this means it can be proved for native collagen prepared by a special method that the density pattern of stained samples imaged in the electron microscopy is identical with the density pattern available from moist fibres. The reflex intensities of the small angle X-ray scattering are taken for calculating the density structure whereby the necessary phases are delivered by the electron microscopic examination combined with light diffraction.

Changes of the ratio between myelin thickness and axon diameter in the human developing sural nerve

1978

Axon caliber and myelin sheath thickness of individual nerve fibers were evaluated in the developing human sural nerve using three different methods of measurement: 1. ocular micrometer evaluation of large fibers, 2. photographic enlargements for evaluating large numbers of nerve fibers of all sizes, and 3. electron microscopic enlargements for more precise measurements in selected nerves. The average axonal diameter doubles from 5 months gestation to about 5 years of age. Large fiber group axons increase, during the same period, by a factor of 3--3.5 with a slight decrease thereafter. The myelin thickness increases more slowly, but continuously, between 5 months gestation until the age of …