The effect of the fiber components cellulose and lignin on experimental colon neoplasia

Sixty Sprague-Dawley rats were pair-fed one of three nutritionally identical diets. One diet contained “low-fiber” (3.8% crude fiber); the others contained “high fiber” (28.7% crude fiber) composed of either cellulose or lignin. Although both “high fiber” diets had similar stool bulking effects, only the cellulose diet was associated with a reduction in 1,2-dimethylhydrazine (DMH)-induced colon neoplasms. The cellulose diet was also associated with distinct changes in the gut bacterial profile and with a lowered serum cholesterol. © 1993 Wiley-Liss, Inc.     

Roles of DNA polymerase β on repair of DNA damaged by γ－rays irradiation

ＲｏｌｅｓｏｆＤＮＡｐｏｌｙｍｅｒａｓｅβｏｎｒｅｐａｉｒｏｆＤＮＡｄａｍａｇｅｄｂｙγ－ｒａｙｓｉｒｒａｄｉａｔｉｏｎＣａｉＪｉａｎｍｉｎｇ（蔡建明）；ＺｈｅｎｇＸｉｕｌｏｎｇ（郑秀龙）；ＬｕｏＣｈｅｎｇｊｉ（罗成基）；ＧａｏＪｉａｎｇｕｏ（高建国...     

大鼠正中隆起及垂体结节区生长抑素免疫阳性成分的分布

应用免疫组织化学方法观察了大鼠正中隆起及垂体结节区内生长抑素免疫阳性成分的分布,新发现:在交叉后区的正中隆起前部内侧带,有少量的生长抑素免疫阳性神经元胞体;少量阳性纤维几乎垂直行向腹侧,有的可达脑膜表面。垂体结节区内可见较密集的生长抑素阳性纤维丛,其上可见较多的膨体;一些纤维同样到达腹侧表面。     

热休克反应对大鼠油酸肺保护作用的机制研究

未研究发现，经热休克处理的大鼠注油酸后，肺组织损伤明显减轻，Ｗｅｓｔｅｒｎ印迹分析显示热休克使大鼠肺组织中ＨＳＰ７０含量明显增多；Ｎｏｒｔｈｅｒｎ印迹分析证实此乃由于ＨＳＰ７０ｍＲＮＡ转录增加所致。说明热休克处理使肺组织ＨＳＰ７０基因表达增强；提示热休克反应对大鼠油酸肺的保护作用与肺组织细胞中ＨＳＰ７０基因表达增强及与ＨＳＰ７０增多有关。     

脉冲Nd：YAG激光照射对大鼠炎症牙龈组织的作用

患实验性牙龈炎的大鼠牙龈（６例）经脉冲掺钕钇铝柘榴石激光（Ｎｄ：ＹＡＧ激光）照射后进行光镜及超微结构观察。目的在于了解低能量Ｎｄ：ＹＡＧ激光照射对牙龈炎症的治疗作用。炎症牙龈经输出能量为１．５Ｗ，脉冲数为２０ＰＰＳ的激光照射后与对照组相比较，形态学上有如下变化：上皮细胞无变性；牙龈上皮层数较炎症时减少；上皮下炎细胞浸润明显减少；上皮细胞间隙变小；上皮下结缔组织内产生大量的排列致密的胶原纤维。结果提     

Differences in the hypothermic response to ethanol in rats selectively bred for oral ethanol preference and nonpreference

The duration of retention of tolerance to ethanol was tested in the alcohol-preferring (P) and alcohol-nonpreferring (NP) rats lines, using ethanol-induced hypothermia as a measure of tolerance. Rats received two injections of ethanol (3.5 g/kg) body wt, IP) and the time between the injections was 1, 2, or 3 days. When one day separated the two injections, tolerance to the hypothermic effect of a second “test” injection was found in both lines. When 2 or 3 days separated the two injections, the P line showed a loss of tolerance and the NP line showed sensitization to ethanol. Sensitization in the NP line grew stronger when the interval between injections was increased from 2 to 3 days. The duration of retention of tolerance to ethanol-induced hypothermia in the P line was shorter than has previously been reported for motor impairment in this line. It appears that the duration of tolerance retention in the P line depends on the test used to measure tolerance. Sensitization to ethanol in the NP line may be associated with low oral ethanol intake. This research was supported, in part, by grants AA08312, AA03243, and AA07611 from the PHS     

实验性颅脑伤大鼠脑组织SOD和MDA的变化

目的：观察实验性颅脑伤大鼠脑组织超氧化物歧化酶(SOD)和丙二醛(MDA)的动态变化，探讨SOD和MDA在颅脑伤病理损伤机制中的作用。方法：采用自由落体致伤方法制备大鼠颅脑伤模型(模型组)，并以正常大鼠作对照(对照组)，分别于造模后3、5和7d处死动物取脑，测定海马和皮质中SOD活力和MDA含量。结果：模型组大鼠海马SOD活力在3个时间点均显著低于对照组，而MDA含量均显著高于对照组；模型组大鼠皮质SOD活力在造模后3、5d时显著低于对照组，而MDA含量则显著高于对照组，到7d时二者与对照组均无明显差异。结论：大鼠颅脑伤时脑组织SOD活力显著降低，而MDA含量则显著增高，提示SOD和MDA可能参与颅脑伤病理损伤机制并在其中发挥重要作用。     

Ketanserin降低清醒自发性高血压大鼠血压波动性的机理初探

应用计算机化清醒大鼠血流动力学测定技术，观察５－ＨＴ２受体阻滞剂Ｒｉｔａｎｓｅｒｉｎ（Ｒｉｔ）和α１受体阻滞剂哌唑嗪对清醒自发性高血压大鼠（ＳＨＲ）的血压、血压波动性（ＢＰＶ）和动脉压力感受性反射血压控制部分（ＡＢＲ－ＢＰ）的效应，旨在初步探讨兼具５－ＨＴ２受体和α１受体阻滞作用地新型抗高血压药Ｋｅｔａｎｓｅｒｉｎ降低ＢＰＶ的机制。结果表明：Ｒｉｔ对ＳＨＲ无降压作用，但侧脑室给药明显提高ＡＢＲ－Ｂ     

Spinal cord restitution following compression injuries in rats

Spinal cord compression injuries were produced in rats by applying weights to a plate 2.2 x 50 mm in size, placed on the exposed midthoracic dura covering the spinal cord. The influence of force and duration of compression was studied by using 3 different weights, 20, 35 and 50 g, applied for 1, 5 and 10 min. Postoperative neurological function was tested by the inclined plane method and the rats were observed for 3 weeks. Neurological impairment increased with force and duration of compression. It is therefore reasonable to conclude that patients suffering from spinal cord injury should be investigated immediately for signs of persistent cord compression. If this is present, early decompression might be of value, although nothing is known in man concerning the limits of force and duration of compression permitting postoperative neurological recovery.