Characterization of membrane occupation and recognition nexus repeat containing 3, meiosis expressed gene 1 binding partner,in mouse male germ cells

Mammalian spermatogenesis is a well-organized process of cell development and differentiation. Meiosis expressed gene 1 (MEIG1) plays an essential role in the regulation of spermiogenesis. To explore potential mechanisms of MEIG1''s action, a yeast two-hybrid screen was conducted, and several potential binding partners were identified; one of them was membrane occupation and recognition nexus repeat containing 3 (MORN3). MORN3 mRNA is only abundant in mouse testis. In the testis, Morn3 mRNA is highly expressed in the spermiogenesis stage. Specific anti-MORN3 polyclonal antibody was generated against N-terminus of the full-length MORN3 protein, and MORN3 expression and localization was examined in vitro and in vivo. In transfected Chinese hamster ovary cells, the antibody specifically crossed-reacted the full-length MORN3 protein, and immunofluorescence staining revealed that MORN3 was localized throughout the cytoplasm. Among multiple mouse tissues, about 25 kDa protein, was identified only in the testis. The protein was highly expressed after day 20 of birth. Immunofluorescence staining on mixed testicular cells isolated from adult wild-type mice demonstrated that MORN3 was expressed in the acrosome in germ cells throughout spermiogenesis. The protein was also present in the manchette of elongating spermatids. The total MORN3 expression and acrosome localization were not changed in the Meig 1-deficient mice. However, its expression in manchette was dramatically reduced in the mutant mice. Our studies suggest that MORN3 is another regulator for spermatogenesis, probably together with MEIG1.     

医院文化建设的误区分析及思考

当前，医院文化的建设越来越受到重视，但是一 些医院的文化建设还存在一些误区，需要加以认真 分析和思考。     

Ryk-mediated Wnt repulsion regulates posterior-directed growth of corticospinal tract

Guidance cues along the longitudinal axis of the CNS are poorly understood. Wnt proteins attract ascending somatosensory axons to project from the spinal cord to the brain. Here we show that Wnt proteins repel corticospinal tract (CST) axons in the opposite direction. Several Wnt genes were found to be expressed in the mouse spinal cord gray matter, cupping the dorsal funiculus, in an anterior-to-posterior decreasing gradient along the cervical and thoracic cord. Wnts repelled CST axons in collagen gel assays through a conserved high-affinity receptor, Ryk, which is expressed in CST axons. Neonatal spinal cord secretes diffusible repellent(s) in an anterior-posterior graded fashion, with anterior cord being stronger, and the repulsive activity was blocked by antibodies to Ryk (anti-Ryk). Intrathecal injection of anti-Ryk blocked the posterior growth of CST axons. Therefore, Wnt proteins may have a general role in anterior-posterior guidance of multiple classes of axons.     

圆孔外面的观察和测量及其面积的回归方程

60具成人颅骨颅底外面的圆孔观察和测量结果表明:圆孔多呈圆形,其次是卵圆形,其它形较少见.据圆孔与翼突外侧板根部延长线的位置关系,分圆孔位置为三型.圆孔外面观的各项测值左右间均无统计学差异,但其中管性圆孔管长度个体差异较大.圆孔的面积左右比较对称者占3.33±2.34%,左>右者占65.51±6.30%,右>左者占34.48±6.30%.圆孔面积左右对称性比较,对临床诊断疾病有参考意义.其面积的回归方程可由其长、宽径乘积推算 .     

Hyperalgesia and neural excitability following injuries to central and peripheral branches of axons and somata of dorsal root ganglion neurons

We examined thermal hyperalgesia, excitability of dorsal root ganglion (DRG) neurons, and antinociceptive effects of N-methyl-d-aspartate (NMDA) receptor antagonists in rats with injury to different regions of DRG neurons. The central or peripheral branches of axons of DRG neurons were injured by partial dorsal rhizotomy (PDR) and chronic constriction injury of sciatic nerve (CCI), respectively, or the somata injured by chronic compression of DRG (CCD). Thermal hyperalgesia was evidenced by significantly shortened latencies of foot withdrawal to radiant heat stimulation of the plantar surface. Intracellular recordings were obtained in vitro from L(4) and/or L(5) ganglia. There are four principle findings: 1) PDR as well as CCD and CCI induced thermal hyperalgesia; 2) PDR produced significantly less severe and shorter duration hyperalgesia than CCD and CCI; 3) intrathecal administration of NMDA receptor antagonists d-2-amino-5-phosphonovaleric acid (APV) and dizocilpine maleate (MK-801) inhibited thermal hyperalgesia in PDR, CCD, and CCI rats. Pretreatment of APV and MK-801 delayed the emergence of hyperalgesia for 48-72 h, while posttreatment inhibited hyperalgesia for 24-36 h; and 4) CCD and CCI increased excitability of DRG neurons as judged by the significantly lowered threshold currents and action potential voltage thresholds and increased incidence of repetitive discharges. However, PDR did not alter the excitability of DRG neurons. These findings indicate that injury to the dorsal root, compared with injury to the peripheral nerve or DRG somata has different effects on the development of hyperalgesia. These contributions involve different changes in DRG membrane excitability, but each involves pathways (presumably in the spinal cord) that depend on NMDA receptors.     

BDBPH—Zn Mn Cd双核配合物的稳定常数及其形态研究

目的测定BDBPH-Zn、Mn、Cd双核配合物的稳定常数,分析不同pH条件下各物种的存在形式及变化规律.方法温度25.0±0.10℃、离子强度0.100mol/L、N2保护下用NaOH标准溶液滴定大环配体BDBPH-金属离子(12)酸性溶液,滴定pH范围2～12,高精度酸度计记录pH值,BEST程序计算稳定常数,SPE和SPEPLOT程序绘制样品分布曲线.结果BDBPH-金属配合物的稳定常数分别为17.72(LogKLZn2),11.58(LogKLMn2),14.28(LogKLCd2).结论配体BDBPH能够与金属离子(Zn、Mn、Cd)形成稳定的双核配合物.     

用国产自体-2000型血液回收机进行血液回收的动物实验研究

通过动物实验研究自体 2 0 0 0型血液回收机的应用价值。方法 :用杂种犬 5只制作外科出血模型 ,并用自体 2 0 0 0型血液回收机行自体血液回收。观察实验犬术后生存情况 ,术前、术后 1周行血常规及血液生化检测。其中 3只犬术后 1周取心、肝、肺、肾、脑、脾进行病理切片检查。结果 :5只犬术后均无输血反应 ,恢复顺利 ,存活良好。血液化验正常。 3只犬术后 1周病理切片检查正常。结论 :国产自体 2 0 0 0型血液回收机回收失血效果良好。血液回输后实验动物无输血反应。对重要器官无明显影响 ,应用该型血液回收机安全、有效。     

大鼠急性氧中毒后全脑细胞能量代谢的活体^31P磁共振谱 …

目的：探讨大鼠急性氧中毒后脑的能量代谢产物与脑细胞内ＰＨ变化的规律。方法：采用磁共振方法,用４．７Ｔ动物磁共振谱仪,检测氧中毒后不同时程各种磷酸化合物与无机磷酸根（Ｐｉ）、磷酸肌酸（ＰＣｒ）与γ－ＡＴＰ以及β－ＡＴＰ与Ｐｉ之间的比值,并根据Ｐｉ的化学位移推算脑细胞内ＰＨ值。结果：氧中毒组物舱１和３小时后ＰＣｒ／Ｐｉ,ＰＣｒ／γ－ＡＴＰ以及β－ＡＴＰ／Ｐｉ值均显著降低;５ｈ后恢复正常;２４和４８小时     

二苯并—18—冠—6和三苯基氧化膦协同萃取Co（Ⅱ）机理研究

目的　研究二苯并 18 冠 6和三苯基氧化膦的 1,2 二氯乙烷溶液 ,从KSCN KCl介质中对Co(Ⅱ )协同萃取。方法　用斜率法确定配合物组成及平衡常数。结果　协萃配合物组成为K(DB18C6 ) 2 ·TP PO·Co(NCS) 3,协萃平衡常数为K′ex=3.4× 10 8(2 5± 0 .5℃ )。结论　TPPO对Co(Ⅱ )萃取有协同效应。     

左氧氟沙星致大疱性皮疹

患者男,26岁。因急性胆囊炎,于2004年1月20日夜到我院急诊科治疗。患者既往无药物过敏史。给予盐酸左氧氟沙星150mg 5%葡萄糖注射液250mL静滴,1次/d。治疗的初始2d,患者无明显不适,第3d,患者自觉全身瘙痒,四肢皮肤出现直径为1～5cm左右大小不等的灼烧样红斑,深红色,并在皮疹中心部分形成水疱和大疱,疱液为浆液性,伴有局部疼痛,尤以右下肢足背为著。立即给予抗过敏、抗感染治疗:5%葡萄糖注射液250mL 地塞米松20mg静滴,10%葡萄糖注射液250mL 10%葡萄糖酸钙注射液20mL静滴,0.9%氯化钠注射液250mL 维生素C注射液2g静滴,同时抽出疱疹内的液体,…