施肥对中龄马尾松根际环境的影响

通过对12年生马尾松人工林进行不同肥种及肥量的施肥试验,研究马尾松林木根际土壤环境对不同元素的响应特征.表明根际土壤营养元素含量增加而pH值下降,土壤酶活性中根际土壤中蔗糖酶、淀粉酶、脲酶及碱性磷酸酶活性高于非根际土壤,而过氧化氢酶及多酚氧化酶活性则正好相反,根际土酶活性较低.经分析,施肥对土壤养分含量和土壤酶活性的影...     

Human gene therapy: possibilities and limitations

Summary Gene therapy provides new options for medicine, and implies new responsibilities for making decisions relating to the limitations which reason and morality impose upon manipulation of the human genome for the benefit both of patients and of society. This contribution outlines the possibilities and limits of gene therapy in man from a medico-technical viewpoint.     

冷冻保存2年的体外受精胚胎移植产犊报道

１４０枚利用完全体外化培养技术生产、经常规方法进行冷冻保存两年后的良种肉牛胚胎，通过非手术法移植到７０头本地母牛，每头受体牛移入２枚胚胎以繁殖纯种后代。结果受体母牛２个情期不返情率为５０％（３５／７０）；１２０ｄ后经直肠检查确诊怀孕率为２７．１％（１９／７０）；９头受体母牛足月产下犊牛１０头，产犊率为１２．９％（９／７０），双胎率为１１．１％（１／９）。受体母牛平均妊娠期为２８０．８天（２６６￣２     

Effect of glucose and phloretin-2′-β-D-glucose (phloridzin) on in vitro fertilization of mouse ova

Summary The fertilization ratio of mouse ova in vitro decreased when glucose concentration in the medium was lowered. However, the addition of phloretin-2--D-glucose (phloridzin), known as a glucose uptake inhibitor, restored the fertilization ratio back to the control level. The glucose moiety of the phloridzin seemed to be responsible for this effect.     

排卵监测和宫腔内人工授精时机的选择

不孕患者３０例５０个周期阴道Ｂ超观察、尿促黄体激素（ＬＨ）测定及宫颈粘液（ＣＳ）评分联合监测排卵，择机进行宫腔内人工授精（ＩＵＩ），观察表明，自然排周期联合监没蚵准确地预计排时间，ＩＵＩ２４ｈ内排卵率达８５％；克罗米酚（ＣＣ）促排卵因成熟卵泡大小差异大，且尿ＬＨ阳性率低有 分不典型，影响了准确掌握ＩＵＩ时机，ＩＵＩ２４ｈ内排卵率３６．４％；ＣＣ＋绒膜激素（ＨＣＧ）促排卵联合监测，根据卵泡大小决定Ｈ     

体外受精——胚胎移植在不孕症治疗中的应用

对 6 0例不孕症患者采用GnRH -a FSH HCG超促排卵方案治疗 ,应用HTF培养基培养胚胎。采样 6 0个取卵周期 ,5 8个周期进行胚胎移植。移植周期妊娠率达34.5 %。从临床效果可见 ,体外受精—胚胎移植是解决输卵管因素不孕最直接的方法