噻啦嗪对全脑缺血再灌大鼠脑皮层单胺递质及超微结构的影响

本文观察了噻啦嗪对四动脉夹闭所致脑缺血３０ｍｉｎ、再灌注１ｈ大鼠脑皮层单胺类递质（ＮＥ、ＤＡ、５－ＨＴ）的影响。结果表明，大鼠全脑急性缺血３０ｍｉｎ、再灌注１ｈ后，脑皮层单胺类递质明显下降（Ｐ＜０．０１），噻啦嗪１０ｍｇ／ｋｇ和２０ｍｇ／ｋｇ腹腔注射进一步减低脑缺血再灌注后单胺类递质的含量，但无统计学意义，噻啦嗪２０ｍｇ／ｋｇ腹腔注射能明显减轻皮层超微结构的改变。     

松果体切除及褪黑素对垂体─肾上腺轴的影响

松果体切除后ｄ１４，大鼠垂体促肾上腺皮质激素细胞呈现功能活跃状态：核仁明显，粗面内质网扩张，高尔基复合体池变宽，囊泡增大；肾上腺皮质束状带细胞出现功能受抑制表现：胞体变小，线粒体及滑面内质网减少，并伴有血清皮质酮水平下降。褪黑素（１０μｇ·ｋｇ－１·ｄ－１，×７ｄ）对肾上腺皮质束状带细胞有刺激作用：胞体变大，线粒体及脂滴增多，滑面内质网更丰富；并且能使血清皮质酮水平升高，对松果腺切除引起的皮质酮水平下降有拮抗作用。提示松果体对垂体─肾上腺轴有调节作用。     

Proliferative fasciitis of the forearm: Case report with immunohistochemical, ultrastructural and DNA ploidy studies and a review of the literature

A case of prollferative fasclitis arising In the left forearm of a 56-year-old man was examined. The lesion was preceded by blunt trauma, measured 1.5 times 1.3 times 1.0 cm, was poorly circumscribed and appeared white to light gray on the cut surface. Light microscopic examinations revealed that spindle cells and giant cells with one or two nuclei and abundant basophllic cytoplasm ware arranged without any organized patterns In collagenous stroma. Ultrastructurally, well-developed rough endoplasmic reticulum separated by varying amounts of fine to course fibrillar materials was detected in the giant cells. Only vimentin lmmunoreactivity was detected In both spindle and gtant cells. The Ki-67 labeling Index of spindle cells was 35% but that of giant cells was less than 5%, and this reflects the quiescent or slow-growing features of these giant cells in proliferative fasclitis. DNA content of the calls, which was examined by Image cytometry, demonstrated diploidy In both spindle (DNA Index = 1.01) and glant (DNA Index = 1.09) calls.     

耐力训练对骨骼肌纤维类型和超微结构的影响

本研究通过对大白鼠长期的耐力训练,观察其对大白鼠骨骼肌纤维类型及肌中线粒体体密度的不同影响,认为对以慢肌纤维为主的比目鱼肌影响不大,对以快肌纤维为主的趾长伸肌有明显的影响,对其肌中的线粒体体密度的增加有显著意义。     

海马神经元的老龄性改变及人参皂甙对其作用的研究

观察老龄大鼠海马ＣＡ：区神经元超微结构的改变以及人本皂甙对其改变的影响。结果表明：老龄大鼠海马ＣＡ３区神经元内脂褐素含量增加，线粒体等细胞器出现明显变性改变，同时可见突触变性；并出现髓样体和膜性结构等异常改变。而投与人参皂甙的老龄大鼠给药组与对照组相比，海马ＣＡ３区神经元上述结构的改变均见明显减轻。提示人参皂甙具有稳定神经元膜系统，促进蛋白质合成，延缓神经元衰老的作用。     

Immunohistochemical and ultrastructural study of Sertoli cells in androgen insensitivity

The ultrastructure of a perfusion-fixed gonad in a case of androgen insensitivity was studied using thin sections and freeze-fracture replicas. The distribution and arrangement of intermediate filaments in Sertoli cells was visualized immunohistochemically using an antibody against vimentin. Leydig cells lacked Reinke crystals, but contained all of the cytoplasmic organelles involved in steroid synthesis and additionally several lysosomes. The basement membrane and the basal lamina of the testicular tubules were considerably thickened. The testicular tubules consisted of gonocytes and Sertoli cells which had an immature nuclear structure, incomplete development of intercellular junctions and a primitive distribution pattern of intermediate cytoplasmic filaments. The previously reported differences in electron density of Sertoli cell cytoplasm are a non-specific feature without significance to Sertoli cell maturation.     

A preliminary study of the fine structure of in vitro fertilized human embryos

The fine structure of rejected human in vitro fertilized embryos was studied by light and transmission electron microscopy. Apart from normal cytoplasmic features, changes suggestive of degeneration are discussed. Cytoplasmic blebs and cellular debris as well as primitive interblastomeric junctions are also described.     

Ultrastructural localization of glycosaminoglycans in human gingival connective tissue using Cupromeronic blue

Human gingiva was stained with cupromeronic blue according to Scott's critical electrolyte concentration technique in order to localize glycosaminoglycans (GAG) in the electron microscope. Identification was performed by digestion with chondroitinase AC, ABC and heparinase. The GAG were localized in three compartments of the connective tissue: the supra-alveolar fiber apparatus, the loose connective tissue and the basement membranes. In the supra-alveolar fiber apparatus, consisting mainly of densely packed parallel collagen fibrils, dermatan sulfate GAG are regularly attached to the d-band of the collagen fibrils. The precipitates (6–7 nm in diamter) aggregate to thicker precipitates (up to 16 nm), thus possibly providing stability to the fiber system. In the loose connective tissue with sparse collagen fibrils dermatan and chondroitin sulfate GAG form very large precipitates (up to 30 nm in diameter and 400 nm length) which interconnect the few collagen fibrils. The basement membranes of the epithelium and capillary endothelium contain heparan sulfate GAG as fine precipitates (4–6 nm in diameter) which form a meshwork. These findings are consistent with the Scott model (1) for the interactions among glycans and glycans and collagen fibrils in connective tissues.     

大鼠海马CA_1区锥体神经元在衰老过程中的超微结构变化

本文对不同年龄组雄性ＳＤ大鼠海马ＣＡ_１区锥体神经元的超微结构进行了观实，结果表明随增龄：（１）锥体神经元核周体基质密度有所下降，一些细胞器在数量、形态上也有变化，还见到”空泡变性”现象．（２）锥体神经元核膜出现皱褶，染色质群集或异染色质边集，核内包含物出现，也偶见“空泡变性”现象．（３）胞突中树突发生显著改变．上述结果可能是大鼠老化的一些形态学指征。