夏日秀发更需要细心护理

夏天阳光热辣辣，直射造成头发损伤会更加严重，会使头发变得枯黄；如果经常游泳的人士更容易因为池水中的氯化物而改变头发的质地，因此夏天的头发护理同样重要。[编者按]     

离子色谱法梯度淋洗测定水中阴离子

水中氟化物、氯化物、硝酸盐氮和硫酸根的测定可采用化学法和离子色谱法。常规的化学分析法要各组分分开检测，检测时间长，耗试剂多，检测结果受实验条件及人工操作等因素的影响较大。离子色谱法取样量小，所耗检测试剂少，操作简便，可多组分同时分析，从而可节约分析成本，提高工作效率，降低劳动强度。但当柱效降低时，则无法用等度淋洗在较短时间内充分分离各阴离子组分，该文采用离子色谱法梯度洗脱分析各阴离子组分取得满意结果。     

劳动卫生

050856视屏作业人员职业紧张分析/宋辉…∥中国职业医学.2003,30(4).2～5探讨视屏作业者的职业紧张程度、紧张反应及有关的影响因素。采用职业紧张调查表(OSI)对宁夏某银行177名视屏作业者进行问卷调查。结果,视屏作业者的紧张因素总分、工作负荷、人际关系以及家庭/工作平衡因     

对中药砂炒盐水浸渍炮制方法的讨论

目的鉴别穿山甲、鳖甲、鸡内金等砂烫类中药的正品与伪品。方法对穿山甲、鳖甲、鸡内金等砂烫类中药进行钠盐鉴别、氯化物鉴别和水分测定。结果穿山甲、鳖甲、鸡内金等砂烫类中药经砂炒盐水浸渍炮制方法炮制后,钠盐鉴别和氯化物鉴别呈正反应,水分含量增加。结论穿山甲、鳖甲、鸡内金等砂烫类中药进行钠盐鉴别、氯化物鉴别呈正反应,水分测定结果水分含量增加5%~10%者不是《中国药典》正品所采用的炮制方法,应判定为伪品。     

以储存黄河水为水源生产纯净水质量的调查

胜利油田矿区生产、生活用水基本采用人工掘建水库所储存的黄河水。为改善职工、家属饮水质量，部分社区、二级单位投资兴建了一批纯净水厂。为了掌握瓶装饮用纯净水质量，我们于2002～2003年对各纯净水厂生产的瓶装饮用纯净水进行了跟踪检测，现将结果报告如下：     

镉中毒慢性肾衰小鼠模型的建立与评价

本文对比研究了氯化汞、碳酸锂、醋酸铅和氯化镉分别混于饲料喂养45d所致小鼠慢性肾损害的情况。发现这4种重金属盐均能引起肾功能和肾组织学损害。但氯化汞和醋酸铅除引起肾损害外,肝、肠亦有严重损害,喂药期间动物死亡率高;碳酸锂喂养后动物死亡率也高,但肾组织学损害轻;氯化镉喂药期间动物死亡率较低,肾损害明显,心、肝和肠无明显损害,停药后肾损害仍进行性加重。结果表明,氯化镉适用于制作慢性肾衰模型。     

Effect of lysozyme chloride on betel quid chewing aggravated gastric oxidative stress and hemorrhagic ulcer in diabetic rats

AIM: To evaluate the protective effect of lysozyme chloride on betel quid chewing (BQC) aggravated gastric oxidative stress and hemorrhagic ulcer in rats with diabetes mellitus (DM). METHODS: Male Wistar rats were challenged intravenously with streptozotocin (65 mg/kg) to induce DM. Rats were fed with regular pellet food or BQC-containing diets. After 90 d, rats were deprived of food for 24 h. Rat stomachs were irrigated for 3h with normal saline or simulated gastric juice. Rats were killed and gastric specimens were harvested. RESULTS: An enhancement of various gastric ulcerogenic parameters, including acid back-diffusion, mucosal lipid peroxide generation, as well as decreased glutathione levels and mucus content, were observed in DM rats. After feeding DM rats with BQC, an exacerbation of these ulcerogenic parameters was achieved. Gastric juice caused a further aggravation of these ulcerogenic parameters. Daily intragastric lysozyme chloride dose-dependently inhibited exacerbation of various ulcerogenic parameters in those BQC-fed DM rats. CONCLUSION: (1) Gastric juice could aggravate both DM and BQC-fed DM rat hemorrhagic ulcer; (2) BQC exacerbated gastric hemorrhagic ulcer in DM rats via enhancing oxidative stress and reducing defensive factors; (3) lysozyme chloride effectively protected BQC aggravated gastric damage in DM rats.     

Tetrandrine inhibits Ca^2＋-activated chloride channel in cultured human umbilical vein endothelial cells

INTRODUCTION Tetrandrine (Tet, 6,6',7,12-tetramethoxy-2,2'- dim-ethyl-berbaman) is a purified bis-benzylisoquinoline al-kaloid derivedfrom the root ofa Chinese herb (Stephaniatetrandra S Moore)[1,2]. It was first shown as an anti-hypertensive agent in both normal and hypertensivesubjects in 1950s[3,4]. The primary anti-hypertensiveaction of Tet is presumably due to its vasodilatoryproperty, which was confirmed both in vivo (15 mg/kg in conscious rats) and in vitro (1-100 μmol/L,effecti…     

野罂粟生物碱对豚回肠作用的实验观察

本文通过豚鼠回肠实验观察了野罂粟生物总碱(以下略野总)与吗啡作用关系,实验表明野总对豚鼠回肠的抑制作用与吗啡的兴奋肠管作用互不对抗。纳络酮能对抗吗啡兴奋肠管作用而不能对抗野总的抑制肠管作用。心得安、妥拉苏林也不影响野总的作用,氯化钡却能对抗野总的抑制肠管作用,结果提示,野总对豚鼠回肠的作用与受体无直接关系而是直接抑制肠管平滑肌。     

氯离子通道阻断剂对肺血管内皮细胞氧化损伤的保护作用

目的:研究氯离子通道阻断剂在肺血管内皮细胞氧化损伤中的作用。方法:以肉联厂检疫合格的健康小牛为研究对象,过氧化氢(H2O2)诱导体外培养的牛肺动脉内皮细胞损伤,观察Cl-通道阻断剂对受损细胞细胞活力、乳酸脱氢酶(LDH)释放量、三磷酸腺苷(ATP)含量、细胞内钙离子浓度犤Ca2+犦i和DNA降解程度的影响。结果:Cl-通道阻断剂可使受损细胞的细胞活力得到提高,NPPB组和NFA组分别恢复到0.449±0.015和0.535±0.023;LDH释放量下降,分别为(12.4±0.4)%,(6.4±0.6)%。ATP含量分别回升为18.22nmol/mg蛋白质和21.96nmol/mg蛋白质,犤Ca2+犦i下降和DNA降解程度减轻。结论:Cl-通道参与了氧化剂对肺血管内皮细胞损伤的病理过程,Cl-通道阻断剂对肺血管内皮细胞的损伤具有保护作用。