十七年“土改 合作化”小说中的中农

作为农村的中坚阶层，中农在相关政策层面一直被定义为中国革命的依靠和团结对象。但在部分“土改合作化”小说中中农的合法身份却不断遭受质疑。中农身份从理论到实践的不稳定性最终反映到文学中。这折射出土地改革的最终走向，并对当下中国社会持续产生各种影响。研究中农形象的特殊表现形态，对于反思“土改 合作化”叙事具有一定的文学史意义。     

高效液相色谱法测定鱼饲料中甲基睾丸酮含量的研究

试验建立了鱼饲料中17α-甲基睾丸酮的液相色谱检测方法。该方法以甲醇提取样品中的甲基睾酮,3β-甲基-17β-羟基-5-雄烯-7-酮为内标;梯度洗脱,流动相分别为水-乙腈溶液(80:20,V/V),流速0.5 ml/min;柱温40℃,DAD检测器检测,内标法定量,甲基睾酮的平均保留时间为11.29 min(R.S.D=0.20%),内标为8.68 min(R.S.D=0.19%)。结果表明,在7.5～60.0μg/ml范围内线性关系良好,拟合度为0.999 8,回收率在94%～100%之间,相对标准偏差为1.97%～3.21%。     

优质出口花生品种“花17”的应用研究

花生品种花17是一个传统出口品种。迁宁地区花生没有黄曲霉污染，但一直没有大连地区花生出口国外。引进并试种该品种，取得了良好效果，无论产量还是品质均受农民及外商好评，解决了农民“卖难”问题，又使农民收入增加，并为国家赚取了外汇。     

Controlled release of estradiol-17β and bisphenol A from a silicone tube for long-term administration in mice

Silicone tubes filled with estradiol‐17β (E2) or the xenestrogen, bisphenol A (BPA) were covered with a polyethylene tube and implanted into mice subcutaneously. The releasing patterns from the tube in vivo were obtained from the volume of estrogen remaining in the tube by measurement with high performance lipid chromatography. E2 in glycerol was released in a few days from a silicone tube, which was not covered with a polyethylene tube (Type A). However, E2 in sesame oil was released very slowly from the silicone tube covered with a polyethylene tube (Type B) and approximately 10% of E2 remained in the tube at 56 days after implantation into the mice. The mean linear regression equation for E2 was Y = 70.967 ? 1.2271X (R² = 0.9268) and the quadratic regression equation was Y = 77.97 ? 2.2773X + 0.0194 × 2 (R² = 0.9864). The remainder rate curves of E2 and BPA were not significantly different throughout the experimental period of 56 days. The Type B tube in the present experiment might be useful for long‐term administration of estrogens.     

子莲新品种建选17号的选育

以红花建莲、寸三莲65、太空莲2号为亲本，经杂交选育出子莲建选17号。该品种茎秆粗壮，生长势强，莲蓬扁圆形，蓬面直径11～16cm，结实率72％～85％，心皮平均25枚，莲子卵圆形，洁白，风味较好，通心白莲百粒干重约103g，一般每667m^2产干莲65kg，对腐败病和叶斑病的抗性强于红花建莲。     

The toxicity and physiological effect of neem limonoids on Cnaphalocrocis medinalis (Guenée) the rice leaffolder

The effect of neem (Azadirachta indica) limonoids azadirachtin, salannin, deacetylgedunin, gedunin, 17-hydroxyazadiradione, and deaceytlnimbin on gut enzyme activity of the rice leaffolder larvae was investigated. When fed a diet of rice leaves treated with limonoids in bioassays, gut tissue enzymes—acid phosphatases (ACP), alkaline phosphatases (ALP), and adenosine triphosphatases (ATPase) activities of rice leaffolder (Cnaphalocrocis medinalis) larvae are affected. Azadirachtin was most potent in all experiments. Larvae that were chronically exposed to limonoids showed a reduction in weight (59-89%) and exhibited a significant reduction in ACP, ALP, and ATPase activities. These results indicate neem limonoids affects gut enzyme activities. These effects are most pronounced in early instars.     

中熟蟠桃新品种——瑞蟠17号的选育

瑞蟠17号是以幻想为母本,瑞蟠2号为父本杂交选育而成的中熟蟠桃新品种。该品种果形圆整,外观艳丽;北京地区7月底果实成熟,果实发育期107d左右;平均单果质量127g,最大果质量145g;果个均匀;果顶凹入,不裂顶;果皮底色为黄白色;果面全面着玫瑰红～紫红色晕;肉质为硬溶质,风味甜;可溶性固形物含量12.3%;半离核;树势中庸、早果、丰产。     

Effects of paraquat and glyphosate on steroidogenesis in gonads of the frog Rana esculenta in vitro

Herbicides are toxic for amphibians, influencing various developmental stages. In particular, paraquat and glyphosate have teratogenic effects on tadpole development, though little information is available on how they affect reproduction in amphibians. In the present work, ovarian tissue and testis of the water frog Rana esculenta were incubated in vitro in presence of different concentrations of the two herbicides. 17β-estradiol and testosterone levels were measured in the incubation medium by radioimmunoassay. The data showed that paraquat inhibited testosterone and 17β-estradiol production, with the lowest-observed-effect concentration (LOEC) of 10⁻⁴ M, while paraquat inhibition of steroidogenesis in amphibian gonads was reversed by the presence of epigallocatechin gallate in the culture medium. These result indicates that paraquat acts on gonadal steridogenesis through a mechanism involving reactive oxygen species. Glyphosate showed no effect on gonadal steroidogenesis. These results suggest that paraquat may interfere in amphibian reproductive processes.