Cathodes for fuel cells using proton-conducting Li2SO4–Al2O3 electrolyte

The performances of three widely different cathode materials (Pt, strontium-doped lanthanum manganite (LSM), and NiO) have been compared for use with proton conducting Li₂SO₄–Al₂O₃ composite electrolyte, using H₂S–air and H₂–air fuel cells operating at 600 °C. Surface analysis and electrochemical techniques were used to characterize fresh and used electrode materials. Pt or LSM cathodes each became covered with Li₂SO₄ and Al₂O₃ and, as a consequence, the fuel cells showed poor performance. In contrast, the NiO cathode catalyst did not become covered with Li₂SO₄ and good fuel cell performance was achieved. Exceptionally good current densities of over 100 mA/cm² and power densities of over 30 mW/cm² were obtained for H₂S–air fuel cells having Mo–Ni–S anode catalysts. Slight agglomeration of NiO particles during fuel cell operation had only a minor effect on performance.     

组织扩张术皮肤胶原的代谢改变

目的：研究常规扩张（ＩＴＥ）和持续快速扩张（ＣＴＥ）对皮肤胶原代谢的影响。方法用白色小家猪制作组织扩张术动物模型，用Ｇｏｒｄｅｌａｄｚｅ法测定血清和扩张组织的羟脯氨酸（ＨＰ）含量，藻酸盐印模材膜片法测量标记区面积；光镜测量真皮厚度。结果：ＩＴＥ组血清ＨＰ含量升高，０．８倍，ＣＴＥ组升高１．２倍，ＩＴＥ和ＣＴＥ组皮肤含量与正常皮肤相同，组织中ＨＰ总量均明显升高，持续扩张皮瓣组（ＣＴＥＦ）术后４ｗｋ皮     

慢性放射性溃疡32例治疗体会

慢性放射性溃疡治疗难度较大，为寻求适当的治疗方案提高疗效，对既往病例进行了回顾。总结了自１９８３年以来，慢性放射性溃疡３２例的治疗经验，对发病原因、部位、病变特点及治疗方法作了分析。３１例治愈、创面Ｉ期愈合２６例，Ⅱ期愈合５例，死亡１例。认为须提高对放射溃疡的重视和认识，针对不同的病变部位，深度及其特点，采取不同的清创方法及相应的修复措施。为改善局部血循环，应以皮瓣或肌皮瓣治疗为首选。     

Influence of Qingdai Compound Capsule on the expression of c-myc in psoriatic keratinocytes) on the expression of c-myc in psoriatic keratinocytes

In this immunohistochemical study, the authors detected the expression of c-myc in keratinocytes (ECK) from 30 psoriatics before and after Qingdai Compound Capsule (QDCC) treatment and 12 normal subjects for control. The results showed that the ECK of patients before treatment was significantly higher than that in the normal control group, and its level was correlated with histopathological changes of affected skin. After treatment the ECK was normalized. It is believed that QDCC could decrease the ECK in psoriatics and this effect was probably mediated by inhibiting c-myc expression. This study provided an experimental evidence for the application of QDCC in treating psoriasis.     

改良超滤对婴幼儿心脏手术输血的影响

目的　观察改良超滤技术在婴幼儿体外循环心血管手术中对输血及术后出血的影响。方法　 6 0例接受体外循环下心血管手术的先天性心脏病患儿 ,均分为对照组 (不接受任何超滤 )、常规超滤组 (CUF组 )和改良超滤组 (MUF组 )。观察术中库血用量、血浆用量、血球压积的变化及术后2 4h出血量 ,并用SSPS/PC进行统计学处理。结果　MUF组库血用量、血浆用量、术后 2 4h出血量显著低于对照组和CUF组 (P <0 0 1) ,且滤出水量明显多于CUF组 (P <0 0 1)。结论　在婴幼儿心血管手术中 ,改良超滤可有效排出体内水分 ,提高血球压积 ,明显减少输血及术后出血 ,是节约用血的重要手段之一。     

纸质病案保存期限的思考

本文作者比较了不同时期的纸质病案的使用率,讨论了旧病案的缺点,如难于保存,占用空间及实用价值不大.作者提出了改进保存病案的办法.