Adiposity and adiponectin in dogs: investigation of causes of discrepant results between two studies     

Verkest KR  Rose FJ  Fleeman LM  Rand JS  Morton JM  Richards AA  Ishioka K  Whitehead JP 《Domestic animal endocrinology》2011,41(1):35-41

Although one study showed lower adiponectin concentrations in obese dogs, other recent studies indicate that adiponectin might not be decreased in obese dogs, raising the possibility that the physiology of adiponectin is different in dogs than in humans. The aim of this study was to investigate possible causes of the discrepancy between the two largest studies to date that assessed the association between adiposity and adiponectin concentration in dogs, including the validity of the assay, laboratory error, and the effects of breed, sex, and neuter status on the relationship between adiposity and adiponectin concentrations. Adiponectin concentrations measured with a previously validated adiponectin ELISA were compared with those estimated by Western blotting analysis of reduced and denatured plasma samples. The possibility of laboratory error and the effect of EDTA anticoagulant and aprotinin were tested. Adiponectin concentration was measured by ELISA in 20 lean dogs (10 male and 10 female, 5 neutered in each sex). There was close correlation between adiponectin concentrations measured by ELISA and those estimated by Western blotting analysis (r = 0.90; P < 0.001). There was no substantial effect of EDTA, aprotinin, or laboratory error on the results. There was confounding by neuter status of the relationship between adiposity and adiponectin concentrations, but adiponectin concentrations were not significantly lower in male than in female lean dogs (females, 36 mg/L; males, 26 mg/L; P > 0.20) and were not significantly lower in intact than in neutered lean male dogs (intact, 28 mg/L; neutered, 23 mg/L; P = 0.49). We conclude that the adiponectin ELISA previously validated for use in dogs appears to be suitable for determination of canine adiponectin concentrations and that testosterone does not appear to have a strong effect on plasma adiponectin concentrations in dogs. Obesity might decrease adiponectin concentrations in intact but not in neutered dogs.  相似文献   

引进日本性信息素迷向丝控制苹果害虫试验初报   总被引：4，自引：2，他引：4  

冯崇川  韩明玉  杜志辉  张满让 《西北农业学报》2002,11(3):76-77

利用性信息素迷向法控制害虫是一有效途径。引进日本产复合搅乱剂－A控制苹果几种主要害虫，经第1年试验结果表明，在不喷杀虫剂条件下，对桃小食心虫、卷叶蛾类、金纹细蛾等有相当作用，且对七星瓢虫、龟纹瓢虫有很好的保护培养效果。  相似文献   

核桃举肢蛾性诱剂的合成与林间诱蛾活性试验     

郝兴宇  张金桐  王瑞  李咏玲  曹天文 《山西农业大学学报(自然科学版)》2008,28(3):303-305

通过Witting反应合成四种核桃举肢蛾性诱剂。林间诱蛾试验表明:人工合成的四种性诱剂对核桃举肢蛾都有一定的诱蛾活性,不同组分按一定比例组合后诱蛾活性有所增强,特别是Z-8-13∶Ac和Z-9-16∶OH以2∶8的比例组合后诱蛾效果最高。为核桃举肢蛾虫情测报提供了一条有效途经。  相似文献   

The effect of in vivo and in vitro applications of ethrel and GA<Subscript>3</Subscript> on sex expression in bitter melon (<Emphasis Type="Italic">Momordica charantia</Emphasis> L.)     

T. Dennis Thomas 《Euphytica》2008,164(2):317-323

Bitter melon (Momordica Charantia L.) is an important vegetable crop with nutritional and medicinal qualities. As a member of cucurbitaceae it is monoecious with varying proportions of staminate and pistillate flowers. This study was undertaken to determine the effects of various applications of ethrel and gibberellic acid (GA₃) on sex modification in M. charantia. In the first set of experiments, various concentrations of hormones were added to the seed germination medium, in the second, adult plants growing in the field were sprayed with aqueous solutions of ethrel or GA₃ three times at three-day intervals. The number and sex of open flowers was recorded daily for 60 days after the first flower opened and total number of staminate and pistillate flowers was calculated at the end of the experiment. The highest frequency (29.5%) of pistillate flowers was observed in plants treated with 500 ppm ethrel at germination. Similarly, spraying of adult plants with 100 ppm GA₃ increased the proportion of pistillate flowers to 26% relative to 15% in untreated controls. Both ethrel and GA₃ induced significantly higher number of pistillate flowers than control. In vitro hormone application during seed germination was much more successful than spraying of field grown plants.  相似文献   

性比对非繁殖期圈养白鹇行为的影响     

肖绍军  张眷兰  钟象景  刘丙万 《安徽农业科学》2008,36(22)

[目的]为了探讨性比对个体行为的影响。[方法]2007年9~11月在广东象头山国家级自然保护区采用随机取样法和瞬时扫描取样法开展了3种性比圈养白鹇的行为学研究。[结果]不同性比的白鹇都具有明显的日节律:取食高峰出现在16:00~17:00,休息高峰在12:00~13:00。在时间分配上,同一性比的雄性与雌性间存在差异:性比为2∶2时,雄性与雌性在游走和休息上的差异极显著(P<0.01);性比为3∶1时,雄性与雌性在取食和游走的差异极显著(P<0.01)。不同性比的同性间仍存在差异∶雄性在性比为2∶2与3∶1时游走的差异极显著(P<0.01);雌性在性比为2∶2与3∶1时取食和游走的差异极显著(P<0.01),并在性比为3∶1与3∶0时取食和游走的差异极显著(P<0.01)。不同性比的白鹇个体之间亲疏关系不同,但总有2只雌性个体关系密切。[结论]性比对白鹇圈养白鹇的行为时间分配有影响,而且雌性个体更趋于集群活动,雄性则趋于单个活动。  相似文献   

Field trap test for bioassay of synthetic (1<Emphasis Type="Italic">S</Emphasis>,4<Emphasis Type="Italic">R</Emphasis>)-4-isopropyl-1-methyl-2-cyclohexen-1-ol as an aggregation pheromone of <Emphasis Type="Italic">Platypus quercivorus</Emphasis> (Coleoptera: Platipodidae)     

Naoto Kamata  Kojiro Esaki  Kenji Mori  Hiroyuki Takemoto  Toru Mitsunaga  Hiroshi Honda 《Journal of Forest Research》2008,13(2):122-126

An ambrosia beetle, Platypus quercivorus, is a vector of Japanese oak wilt, which causes massive mortality of oak trees in Japan. Previous studies have identified (1S,4R)-4-isopropyl-1-methyl-2-cyclohexen-1-ol ((−)-IMCH) as the major component of the aggregation pheromone of P. quercivorus. We tested the ability of synthetic (−)-IMCH to attract P. quercivorus adults. The synthetic compound attracted 14.4 times as many P. quercivorus, of both sexes, as control traps. Control and (−)-IMCH-baited traps both captured 3.32 times as many males as females, probably because of the nature of Lindgren funnel traps and of male-biased emergence sex ratio early in the season of adult flights. (−)-IMCH was proved to be a major component of the aggregation pheromone of P. quercivorus.  相似文献   

多胺与板栗花性别分化的关系   总被引：3，自引：1，他引：2  

张新生  陈湖  于丽辰  傅友 《河北农业科学》2005,9(4):5-9

研究了板栗花性别分化期内源多胺含量变化以及外源多胺对板栗花性别分化的影响。结果表明,在板栗雄花分化期,抽生结果枝的芽内源腐胺和亚精胺含量高于抽生营养枝的芽;在板栗雌花分化期,抽生结果枝的芽和抽生营养枝的芽内源多胺含量变化基本一致,内源腐胺含量在萌芽前降至最低后到萌芽时升至较高水平,内源亚精胺和精胺含量在萌芽前均略有上升,到萌芽时迅速升至较高水平;在雄花分化期和雌花分化期,抽生结果枝的芽均以亚精胺含量变化幅度最大,腐胺次之,精胺最小。板栗雌花分化期施用外源多胺,外源腐胺对花芽分化(尤其是雌花分化)有显著抑制作用,亚精胺对雌花分化有促进作用。  相似文献   

日本复合搅乱剂-A控制苹果害虫试验初报     

张满让  韩明玉  李丙智 《中国农学通报》2005,21(8):330-330

利用性信息素控制害虫是无公害农业生产者的一种方法,引进日本产复合搅乱剂-A的迷向法控制苹果桃小食心虫、金纹细蛾、卷叶蛾等几种主要害虫试验,无论是连续二年还是当年的处理,其危害率都较对照降低40%~90%,且复合性信息素一次处理,简便易行。引进的桃小食心虫和金纹细蛾性诱剂进行的大量诱捕防治试验,也取得一定效果,特别是诱蛾量高于国产性诱剂的诱蛾量。  相似文献   

水稻二化螟性诱测报发生规律研究   总被引：1，自引：0，他引：1  

石海英  张俊艳 《安徽农业科学》2010,38(36)

[目的]在韶关地区对水稻二化螟(Chilo suppressalis)的发生规律进行测报,为其有效防治提供依据。[方法]利用性诱剂对水稻二化螟雄虫的诱集作用,对二化螟发生的世代、始发期和盛发期进行预测预报。[结果]韶关地区6～10月共出现2代水稻二化螟,第1、2代二化螟的始发期出现在6月的中旬、8月上中旬。第1、2代二化螟的盛发期为7月的中下旬、9月的上中旬。[结论]通过性诱测报方法基本上掌握了水稻二化螟在韶关地区的发生规律。  相似文献   

五味子花芽分化的形态学研究     

艾军  王英平  李昌禹  沈育杰 《特产研究》2009,31(4):22-24

采用石蜡切片法对五味子花芽形态建成研究的结果表明,五味子花芽性别分化不经历两性过渡阶段,即雄花和雌花的花性分化在形态分化前就已经决定。五味子的花芽分化在时间上具有明显的长期性,空间上具有一定的差异性。  相似文献