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Found: 5 467
Page 169 of 547-
Pinocytosis persists in the ileum of hypophysectomized rats unless closure is induced by thyroxine or cortisone.
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[Relation between ultrastructure of the neurohypophysis and subcellular distribution of biologically active substances].
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A quantitative ultrastructural study of the pinealocyte of the chipmunk (Tamias striatus) during the daytime and at night.
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Identification of cytoplasmic laminar bodies in neurons of the cat lateral geniculate nucleus by phase contrast microscopy.
It is demonstrated that cytoplasmic laminar bodies (CLBs) can be identified in Nissl stained celloidin sections by means of phase contrast microscopy. Provided that the refractive index of the mounting medium is in the range of 1.56 to 1.65, CLBs appear as bright holes in the cytoplasm.
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[Rosenthal's "fibers" and spongioblastoma of the central nervous system. II. Electron microscopic studies on the significance of Rosenthal's "fibers"].
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The ultrastructure of astroglia of the corpus callosum during ontogenesis.
An Ultrastructural study of morphological events occurring in the astroglia of the corpus callosum during postembryonal ontogenesis has been undertaken. The results of investigation have shown that in the rat corpus callosum, as early as 1 day postnatal, there may be distinguished two different types of glial cells, which during further maturation develop into protoplasmatic and fibrillar astrocytes. From the observations made it would appear that maturation of the astroglia is a continuous process and no sharp morphological borderlines can be drawn between the astrocytoblast and the astrocyte. However, it has been found that maturation of astrocytes in the rat corpus callosum is completed at the age of between 28 and 40 days postnatal.
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Fast compressive lens-free tomography for 3D biological cell culture imaging.
We present a compressive lens-free technique that performs tomographic imaging across a cubic millimeter-scale volume from highly sparse data. Compared with existing lens-free 3D microscopy systems, our method requires an order of magnitude fewer multi-angle illuminations for tomographic reconstruction, leading to a compact, cost-effective and scanning-free setup with a reduced data acquisition time to enable high-throughput 3D imaging of dynamic biological processes. We apply a fast proximal gradient algorithm with composite regularization to address the ill-posed tomographic inverse problem. Using simulated data, we show that the proposed method can achieve a reconstruction speed ∼10× faster than the state-of-the-art inverse problem approach in 3D lens-free microscopy. We experimentally validate the effectiveness of our method by imaging a resolution test chart and polystyrene beads, demonstrating its capability to resolve micron-size features in both lateral and axial directions. Furthermore, tomographic reconstruction results of neuronspheres and intestinal organoids reveal the potential of this 3D imaging technique for high-resolution and high-throughput biological applications.
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[Ultrastructural study of papillomas of the choroid plexus].
The choroid plexus papillomas are rare neoplasms. They constitute about 0.5 per 100 of all intracranial tumors. From a histological point of view they are generally benign tumors. However they give a high mortality rate due to their location near vital structures, the rapid production of intracranial hypertension, and the rich vascularity making risky the surgical treatment.
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Granule cells, mossy fibres and pyramidal neurons: an electron microscopic study of the cat's hippocampal formation, I.
The ultrastructure of mossy fibre terminals, granule cells, and pyramidal neurons was studied in cat material. The average of the mossy terminals and the density of the synaptic vesicles were analysed. The large mossy terminals establish mainly axo-spiny synapses on the apical dendrites of pyramidal neurons in the CA3 area, but some axo-dendritic synapses were also observed. Mossy fibre endings were found in the subgranular layer, and also on the dendrites of interneurons.
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An unusual organelle in the pineal gland of the rat.
An electron microscopic survey of pinealocytes from normal rats revealed a highly organized arrangement of cytoplasmic tubules. Such tubules had been previously observed in normal rats (Lin, 1967) and in rats after melatonin administration or two weeks exposure to darkness (Freire and Cardinali, 1975). In a later publication the presence of the tubules was attributed to experimental manipulation resulting in infertility (Gusek, 1976). The present study resolves the discrepancy in the literature by establishing that the tubular organelle does indeed occur in untreated male rats, but rather rarely.