硅藻土杀虫剂处理后储粮害虫成虫体重减轻与死亡

研究了硅藻土杀虫剂“普粮泰”对米象、谷蠹、玉米象和锯谷盗成虫体重的影响。在30±1℃、65%±1%RH条件下,试虫分别在0.5~8 g/m2的粉剂药膜上处理1天,它们(顺序同上)的平均体重分别减少了0.1、0.4、0.2和0.2 mg/头,在相同条件下培养7天后,它们的平均死亡率分别为52%、100%、97%和100%。在25±1℃、65%±1%RH条件下,经过1 g/m2粉剂药膜处理锯谷盗1天后,在原条件下不提供食物保持3天,平均每头锯谷盗体重比对照减少了0.2~0.3 mg/头,平均死亡率达到76%。由此可见,硅藻土杀虫剂处理的储粮害虫成虫体重明显减少(P<0.05),死亡率很高,说明硅藻土杀虫剂可能破坏了试虫体壁保持体内水分的蜡质层,从而引起锯谷盗失水干燥而死。     

番茄对钾的吸收和分配的研究

对两个番茄品种，吸钾量的研究表明，“渝抗二号”番茄对Ｋ＾＋的吸收率较高，“早丰”番茄地上部分Ｋ＾＋的分配较多。当用ＮａＮＯ３代替营养液中的ＫＮＯ３后，Ｋ＾＋的分配比例与完全培养液中的植株相似，但分配到地上部的比例较小。加Ｎａ＾＋后，“渝抗二号”植株的叶和茎中的含Ｋ＾＋量比“早丰”更多，表明不同番茄品种在不同的Ｋ＾＋和Ｎａ＾＋环境中，有着明显不同的离子吸收和分配机制。     

微波电路电测及其计算方法

从实际工程的角度出发，对电路电测方法进行了论述。在微通信工程中，需要获得障碍物的位置和高度，最合理的天线高度组合和障碍物绕射损耗等参数，为此论述了微波电路电测方法及技术要求。在大庆－秦皇岛输油管道通信工程中采用了Ａ，Ｂ测试法进行测试，得到高度－损耗曲线。这种曲线给出相对自由空间接收电平与收，发天线高度之间的关系。在测试所得的高度－损耗曲线与断面图相结合的基础上，由绕射损耗计算公式推出了几种常见障碍     

ZIKA种母兔饲粮适宜营养水平的研究

连续三年在相同的繁殖季节，使用齐卡Ｎ系母兔１４８只，分别观察测定了四种不同营养水平组合日粮对不同繁殖状态母兔繁殖能力的影响。结果表明：在延期繁殖（母兔断奶后再配种）条件下，不同能量、蛋白水平对母兔繁殖性能的影响差异不显著（Ｐ＞０。０５），但中能高蛋白（ＤＥ１０．８８兆焦／公斤、ＣＰ１９％）的第３组日粮略胜于其它组合。由此得出，在引延期繁殖的ＺＩＫＡ能繁母兔，适宜的营养水平为：消化能（ＤＥ）１０兆焦／公斤，粗蛋白（ＣＰ）１９％，粗纤维（ＣＦ）１０％。在母兔进行半频密繁殖（母兔产后第１４天开始配种）情况下，高能高蛋白（ＣＤＥ１２．１３兆焦／公斤、ＣＰ１９％）饲粮对提高繁殖性能的效果明显优于高能低蛋（ＤＥ１２．１３兆焦／公斤，ＣＰ１５％）和低能低蛋白（ＤＥ１０．８８兆焦／公斤）和ＣＰ１５％）饲粮（Ｐ＜０．０５），尤其对提高母兔泌乳力效果明显（Ｐ＜０；０１），因此，实行频密（产后立即配种）或半频密繁殖的母兔，适宜营养水平为消化能１２兆焦繁殖的母兔，适宜营养水平为消化能１２兆焦／公斤，粗蛋白１９％，粗纤维９－１２％．     

甘蓝型油菜芥酸基因的等位性和同一性分析

中国的甘蓝型油莱高芥酸品种芥酸含量比外国的高芥酸品种高6～10％。本研究用两个中国高芥酸品种与一个加拿大和一个日本高芥酸品种杂交,其Fl与低芥酸品种测交。F2代和测交后代的分离结果表明,这些材料中的芥酸基因是等位的,也无明显的证据表明它们是复等位基因,因而很可能是同一的。这两类品种芥酸含量的差异可能与遗传背景或修饰基因有关。     

Alkaline phosphatase isoenzymes in feline serum using an agarose gel alkaline phosphatase kit method.

Total serum alkaline phosphatase (ALP) activity is the product of the combined activity of isoenzymes from a number of tissue sources. In this study, a commercially available kit for electrophoretic separation of ALP isoenzymes in an agarose gel was used to separate ALP isoenzymes in feline tissue extracts and serum. Five separate bands of ALP activity were identified. These bands were numbered 1 to 5 with band 1 having the most anodal migration. The tissue of origin corresponding to the migration position of the isoenzymes are as follows: Band 3 was the liver isoenzyme, band 4 was the bone isoenzyme and ALP isoenzymes of both intestine and kidney migrate in the position labelled band 5. Band 1 appears to be related to albumin and does not represent true ALP activity. The tissue source of band 2 (a and b) was not identified. Serum ALP activity of mature, healthy cats is primarily of liver origin. Immature cats (< 1 year of age) have a greater proportion of the bone isoenzyme in the serum.     

烟草黑胫病菌(Phytophthora parasitica var. nicotianae)生理小种鉴定技术研究

在1980-1986年,对烟草黑胫病菌生理小种鉴定技术和方法进行了研究和探讨。结果表明,Nicotiana ncsophil(?),Burley21;Burley37;N.stocktonii是理想的鉴别寄主:整株接种方法优于其他的接种方法;接种物浓度以控制在相同的水平(10~3 ml)为宜。为减小生物测定的差异,所有菌系应一次完成测定。     

LRH─A3、hCG和PMSG对体外培养条件下牦牛垂体组织LH和FSH分泌的调节

促卵泡素３号（ＬＲＨ－Ａ３）、人绒毛膜促性腺激素（ｈＣＧ）和孕马血清促性腺激素（ＰＭＳＧ）等３种外源性激素均可增加体外培养条件下牦牛垂体组织分泌ＬＨ和ＦＳＨ的能力。培养液中ＬＨ和ＦＳＨ含量与加入的ＬＲＨ－Ａ３量呈正相关，与加入的ＰＭＳＧ和ｈＣＧ的量无显著关系     

Nephrotoxicity of amphotericin B in dogs: a comparison of two methods of administration.

Two methods of administration of amphotericin B were compared for their ability to produce nephrotoxicity in 12 dogs. Six dogs received six alternate day doses of amphotericin B: 1 mg/kg administered as a rapid bolus in 25 mL 5% dextrose in water. Another six dogs received alternate day treatments of the same dose of amphotericin B in 1 L 5% dextrose in water over 5 h. Both treatment groups experienced significant reductions in glomerular filtration rate, as measured by inulin clearance, 24 h endogenous creatinine clearance, serum creatinine and serum urea. This reduction in glomerular filtration rate was most marked in the group receiving the drug as a rapid bolus. The inulin clearances decreased from 3.54 +/- 0.30 mL/min/kg (means +/- SEM) on day 0 to 1.15 +/- 0.25 mL/min/kg on day 12 in the slow infusion group and from 3.24 +/- 0.25 mL/min/kg on day 0 to 0.46 +/- 0.11 mL/min/kg on day 12 in the rapid bolus group. Renal lesions characteristic of amphotericin B administration were observed in all dogs tested. The dogs which received amphotericin B as a rapid bolus had a significantly greater number of tubular lesions than the slow infusion group. Systemic side effects, such as vomiting, diarrhea and weight loss, were observed in both treatment groups but were most severe in the rapid bolus group.(ABSTRACT TRUNCATED AT 250 WORDS)     

A comparative histochemical and morphometric study of canine skeletal muscle.

The purpose of this study was to determine whether there were differences in skeletal muscle properties in the hindlimb muscles of different types of dogs. Muscle samples were obtained from the gracilis, sartorius cranial head, sartorius caudal head and tibialis anterior muscles of mixed-breed and hound-type dogs and Beagles. Fiber type, fiber size and capillary morphometry determinations of each muscle from each dog were made from sections stained for myofibrillar ATPase activity. Individual animals were bilaterally symmetric for all measured variables. Fiber type, fiber size and capillary geometry varied between dogs of a given type and muscles within a given dog. There were no differences between dog types for fiber type or fiber size; significant variation in log(muscle)/log(body) mass ratios between dog types was observed for all muscles. The results indicate that for a given muscle, significant variation can occur in skeletal muscle characteristics between different types of dogs and that these differences can be independent of differences in exercise history.