银川地区羊肝中阿苯达唑(丙硫苯咪唑)残留情况的调查

阿苯达唑又称丙硫苯咪唑或丙硫咪唑，有时又称抗蠕敏，是目前国内常用的驱虫效果好、范围广、毒性较低的兽用驱虫药。随着家庭舍饲养羊规模的不断扩大，饲养者为了减少因寄生虫导致的死亡并增加育肥效果，常把阿苯达唑作为育肥前预防驱虫或寄生虫病治疗的首选药，出现了滥用或超剂量使用的现     

犬瘟热的微生物学诊断研究

对临床诊断为犬瘟热的１４例病犬，取其脑组织，运用细胞培养、合胞体检查、包涵体检查、免疫荧光试验、电镜观察等５种检测方法，就犬瘟热的微生物学诊断进行了系统的研究。结果表明，犬脑组织块与猫胚（ＦＥ）细胞或非洲绿猴肾（Ｖｅｒｏ）细胞共同培养，盲传的培养物出现不稳定的细胞病变，通过对不同代次的培养物检查包涵体，并作超薄切片或负染，电镜观察犬瘟热病毒（ＣＤＶ）粒子，证实分离到ＣＤＶ野毒。病犬脑组织切片经ＨＥ染色检查包涵体及用ＣＤＶ荧光抗体直接法检测脑抹片及接种犬脑的细胞培养物，均获得一定的阳性结果。建立的改良离子捕获电镜法，用于检测犬脑匀浆和犬脑接种细胞培养物，与离子捕获电镜法、免疫电镜法及直接电镜法相比，效果更为理想。１４例临床诊断为犬瘟热的病犬，综合运用上述微生物学手段检测，结果为１２例阳性，２例疑似。     

辣椒黄绿苗突变体生物学特性及生长动态研究

对96－140牛角辣椒及96－140辣椒黄绿苗突变体（96－140YBM）生物学特性、生长动态、抗病性等方面进行了测定，试验收结果表明96－140辣椒黄绿苗突变体不仅在生长势，叶片、株重、单果重等方面强于96－140，而且在抗疫病方面明显强于96－140牛角辣椒。96－140YBM性状遗传稳定，苗期遗传标记性状明显，在杂交育种及纯度鉴定上有较大的利用价值。     

O,O-二烷基-N-莰-2-基(硫)磷酰胺酯的合成

合成了14个含有 N-莰-2-基的磷酰胺和硫代磷酰胺类化合物,用红外、核磁及元素分析确定其结构,并探讨了~(31)Pδ值的规律性变化。初步生物试验表明,磷酰胺类化合物对水稻发芽具有明显的抑制作用,其中化合物Ⅱ1的活性大于对照药剂抗倒胺但低于多效唑。     

苹果试管苗不定根起源及其发育状况的研究

利用光学和扫描电子显微镜观察结果表明,经琼脂生根培养基诱导产生的长富—2苹果 (Malus pumila Mill.) 试管苗的不定根起源于维管形成层。这种不定根发育不良,根表面缺乏根毛,内部解剖构造为典型的初生结构。为避免因不定根吸收、运输能力差而影响试管苗移栽成活,宜采用通透性良好的基质进行瓶内或瓶外生根,可诱导出优质不定根。     

Spring Barley Responses to Row Spacing and Fungicide Triadimefon in Regions with a Short Crop-growing Season

Aspects of intensive management practices such as high-yielding cultivars, narrow-row spacings and fungicide treatments could potentially increase cereal yields in regions with a short crop-growing season and occasionally dry and hot weather. A field experiment was carried out at McGill University, Canada for three years (1987 to 1989) to test the effects of triadimefon (1-[4-chlorophenoxy]-3,3-dimethyl-1-[1H-1,2,4-triazol-1-yl]-2-butanone, or Bayleton, a trade name) fungicide (0 vs. 140 g a.i. ha⁻¹) and row spacing (10 vs. 20 cm) on the yield components, yield and other agronomic traits (spike emergence, days to maturity, leaf disease and plant height) of spring barley ( Hordeum vulgare L.) cv. Cadette, Laurier and Leger. A cultivar by row spacing interaction resulted in a 11 to 13.5 % increase in grain yield due to narrow rows for Laurier in two out of the three years and up to 16 % for Leger in one year. Over the three years grain yields were on average increased 6 to 12 % due to use of the narrower row spacing. Fungicide application to barley at the early heading stage effectively controlled leaf diseases without influence on yield components or grain yield. Our results indicate that some components of intensive management such as narrow row spacing can be applicable in regions with a short crop-growing season.     

狗年侃犬

狗年侃犬,犬即是狗,狗即是犬。就字而言,狗是口头语为多,犬是书面语为多。犬与人类的交流与融合,源远流长,这是一个说不完、道不尽的话题。犬的文化也是人们津津乐道的话题,也是一个国家一个民族的文化。我国养犬的历史有几千年,对犬也说法众多,褒贬不一。狗、犬从生物科学来讲都是表述同样的动物,但从中国人文化的内含却有很大的差异。中国人对狗这个字的理解大都含有贬意,民间通俗用语,比较粗糙。对犬的理解似乎有些褒奖与赞美之意,是学术用语,有文化内涵。狗常常是用来形容不好的人或事,是没有教养与没有学问的,人类对它是要进行限制管理…     

SDS-PAGE和PCR检测1B/1R易位系研究初报

采用18个冬小麦品种作为供试材料,分别通过SDS-PAGE检测黑麦Secalin蛋白和PCR检测黑麦1RS染色体或其片段,结果表明:SDS-PAGE检测不出不带有secalin蛋白的1B/1R小片段易位系,而PCR则能检测出,从而提高1B/1R易位系的检出率;SDS-PAGE和PCR结合是检测1B/1R易位系的一种快速经济的有效方法。     

几种叶面肥料在小菊上的筛选与应用研究

试验采用单因素随机区组设计,叶面喷施肥料的施肥方法,应用方差分析和多重比较分析试验数据,从而筛选出小菊最佳的营养元素配方。试验从不同叶面肥料在小菊上的筛选与应用研究的试验结果得到：小菊对肥料具有较强的选择性：三高灵的施用能够增加小菊的开花数量和鲜叶片叶绿素的含量；宝力丰的施用能提高小菊单株的干物重；OPAL的施用能延长小菊开花的花期。     

Evaluation of a combined penetrometer for simultaneous measurement of penetration resistance and soil water content

A combined penetrometer is an appropriate tool to measure the soil cone resistance and the water‐content profile. As a relatively new technique, a combined capacitance‐penetrometer for the simultaneous measurement of cone index and soil water content was developed at the Department of Agricultural Engineering of Bonn University in 2002. The objective of this study was the evaluation of the effectiveness and applicability of the innovated penetrometer with a focus on three aspects: (1) A capacitance sensor with two electrode configurations was calibrated for silt loam, sandy loam, and sand. The calibration results show that both electrode configurations have sufficient water‐content sensitivity, but soil‐specific calibrations seem necessary. (2) Under laboratory conditions, the dynamic resolution and response of the capacitance‐penetrometer were validated, and its radius of influence was determined. (3) The field measurement results demonstrate that this measurement technique can be used to improve the interpretation quality of soil cone index data.