HISTOLOGY

So far no controlled study has been conducted to compare clinically and histologically between the various peeling formulations. However, a few ideas regarding phenol-based 

Thick male skin is usually less responsive to deep peel, but men with severe actinic damage or acne scarring benefit significantly from the procedure. 

At the stem apex, alkaloids are present in all the young undifferentiated cells. According to Molle (6), the most recently formed cells have comparatively little, the precipitations increasing to a maximum density at a short distance behind the actual apex. The zone of tissue differentiation is also abundantly supplied, but as differentiation proceeds, alkaloids disappear from the vascular strands, and then from the central tissues of the pith. When differentiation is complete, the alkaloids are located principally in three concentric layers, in the epidermis and outer cortical layers just below it, in parenchyma within and adjacent to the phloem, and in the periphery of the pith just inside the xylem strands. The xylem parenchyma and medullary rays also possess alkaloids after they have disappeared from the conducting elements. 

3 very abundant 2 abundant 1 present and detectable 0 absent. 

The calyx and corolla show abundant alkaloids in the epidermis. The anthers possess them in the epidermis, the tapetal layers around the developing pollen sacs, and in the bundle sheath of the filament, but not in the vascular elements themselves. Carpels and ovules contain abundant alkaloids in all parts. During the development of the ovule into a seed, its alkaloids diminish and at the resting stage are confined to a single layer of crushed cells on the inside of the testa. The embryo itself and the endosperm are both devoid of alkaloid. The ripe berry has abundant alkaloid in the epidermis, mesocarp, and placenta. 

There is ubiquity of neurocellular involvement and of progressive reactive gliosis, although the degree of involvement varies considerably in certain areas. In addition to the findings in the central nervous system, retina and nerve cells of the myenteric plexus (Leistyna 1962) show changes. 

Ganglion cells are swollen and rounded with widening or ballooning of the dendritic processes. The nuclei are displaced to the periphery and may show signs of disintegration (see fig. 1). With the electronmicroscope infoldings and other irregularities of their surface may be seen which impart to such nuclei a lobulated appearance. Deposition of abnormal material within the nucleus has not been observed the nucleoli are normal (Terry and Weiss 1963). 

The typical ultrastructural ganglion cell abnormalities consist of membranous cytoplasmic bodies (MCB) (see fig. 3) which are round or oval, measure 0.5 to 2.0// in diameter and may occupy a considerable portion of the cytoplasm (Terry and Weiss 1963, Korey et al. 1963a, b, Samuels et al. 1962, 1963, 1965, Terry and Korey 1960, 1963). They are also found in the axis cylinders, glial cells and perivascular cells. Their composition and pathogenesis is discussed in detail below. Other intracellular components appear diminished in number. Vacuoles and small channels may be seen which impinge on the Golgi apparatus. The mitochondria appear normal, even in highly abnormal cells, and ribosomes are plentiful. 

Demyelination is usually diffuse, but normal myelin sheaths can be found. The pyramidal tract may be intact through brain stem and medulla, with demyelination of its lower portions (Fischer 1955). Significant demyelination in the spinal cord may be more typical in adult cases. 

With the electronmicroscope the axoplasm may appear coarsely granulated and peripherally displaced. In the presence of structurally intact myelin this is strongly reminiscent of very early Wallerian degeneration ( Vial 1958, Terry and Harkin 1959, Terry and Weiss 1963). 

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The primary use of EIA when it was first developed was for histological labeling and localization of specific cell macromolecules. Eor example, enzymes labeled with peroxidase were used to locate specific cellular compartments and stmctures for microscopic examination. The flexibiUty of EIA was recognized quickly and it was adapted for use as a laboratory assay. 

EIA was originally developed as a histological technique to localize specific ceUular sites using the specificity of an immunological reaction (23). The resulting fluorescent antibodies can be detected in animal tissues at levels as low as 1 /tg/mL of body fluid. Eluorophore-labeled antibodies have also been used widely for flow cytometry appHcations using fluorescein antibodies to cell surface markers to detect and quantify specific cells (24). 

Leather technologists have adopted the same histological techniques for the study of hide and skin stmcture as that used by the medical profession for the study of the stmcture and functions of human skin (1,2). 

Microscopes are also classified by the type of information they present size, shape, transparency, crystallinity, color, anisotropy, refractive indices and dispersion, elemental analyses, and duorescence, as well as infrared, visible, or ultraviolet absorption frequencies, etc. One or more of these microscopes are used in every area of the physical sciences, ie, biology, chemistry, and physics, and also in their subsciences, mineralogy, histology, cytology, pathology, metallography, etc. 

Muscle tissue is unique in its ability to shorten or contract. The human body has three basic types of muscle tissue histologically classified into smooth, striated, and cardiac muscle tissues. Only the striated muscle tissue is found in all skeletal muscles. The type of cells which compose the muscle tissue are known as contractile cells. They originate from mesenchymal cells which differentiate into myoblasts. Myoblasts are embryonic cells which later differentiate into contractile fiber cells. 

Moses, M., and Prioleau, P. Ct. (1985). Cutaneous histologic findings in chemical workers with and without chloracne with past exposure to 2,3,7,8-tetrachlorodibenzo-/i-d oxin. i.. 4m. Acad. Dermatol. 12, 497-506. 

BERBERIDACE.J1. In the course of histological investigations of Himalayan Berheris spp. Chatterjee has recorded the presence of alkaloids in the following species aristaia DC., lycium Royle, Wallichiana DC., Wallichiana DC. var latifolia, and vulgaris L. The alkaloids of B. insignis Hook, B. nepalensis Spreng and B. umbellaia Wall, also dealt with in this work, were subsequently characterised see below). 

Gewebe-. textile tissue, histological, histo-. gewebeahnlich, a. web-like, webby. Gewebe-draht, m. gauze wire, -farbstoff, m. histohematin. 

Gewebs-. = Gewebe-. -brei, m. (Bact.) tissue pulp, -lehre, /. histology, -waren, /.pi. textile goods, textiles. 

Banoezy, J., Roed-Petersen, B. Pindborg, J. J. and Inovay, J. Clinical and Histologic Studies on Electrogalvanically Induced Oral White Lesions Oral Surgery, Oral Medicine and Ora Pathology, 48, 319-323 (1979)... 

Isolation of multiple forms of Periphylla luciferase. In agreement with the histological findings noted above, two types of luciferase, a... 

Since the early studies by Panceri (1878), the luminescence of this animal has been well studied in the areas of morphology, histology and physiology, but only briefly in biochemistry. 

Bone defects surgically produced in sheep and rabbit models, have been treated with freeze dried methylpyrrohdinone chitosan [334-336]. hi view of improving bone tissue reconstitution with chitosan associated with calcium phosphate. Microscopic and histological analyses showed the presence of an osteogenic reaction moving from the rim of the surgical lesion toward the center. In control lesions, dense fibrous tissue, without the characteristic histoarchitecture of bone was observed. 

However, it is clear that the resting compliance is relatively more important to the springlike behavior of many active smooth muscles. Each smooth muscle must be analyzed individually since the extracellular compartment of each smooth muscle as a histological entity is different. 

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