QUANTIFICATION OF CEREBRAL VENTRICULAR VOLUME IN ENGLISH BULLDOGS     

Charles H.  Vite  DVM  Erik K.  Insko  PhD  MD  Helena M.  Schotland  MD  Karen  Panckeri  BA  Joan C.  Hendricks  PhD  VMD 《Veterinary radiology & ultrasound》1997,38(6):437-443

Quantitative measurement of cerebral ventricle volume of eight English bulldogs was performed using magnetic resonance (MR) imaging. The mean ventricular volume was 14.8 ml. with a range of 8.6 m1.-38.1 ml. The mean ventricular volume of two beagles was 2.2 ml with a range of 0.7 m1.3.7 ml. The percent of intracranial volume occupied by ventricle was found to be significantly larger in bulldogs (14.0%; S.D. = 7.9%) than in beagles (Range = 1.048%). The relationship between the percent of intracranial volume occupied by ventricle and measurements of body weight, age, sex, and various measures of skull anatomy of the bulldog was also determined. The relationship between ventricular volume and neurologic dysfunction was examined. There was a possible trend between high percent of intracranial volume occupied by ventricle and low body weight. This study will serve as a pilot study for examining the relationship between ventricular volume and neurologic disease in bulldogs.  相似文献   

The sensitivity of water extractable soil organic carbon fractions to land use in three soil types     

Vladimir Ćirić  Milivoj Belić  Ljiljana Nešić  Srđan Šeremešić  Borivoj Pejić  Atila Bezdan 《Archives of Agronomy and Soil Science》2016,62(12):1654-1664

Soil organic carbon (SOC) has a high impact on the sustainability of ecosystems, global environmental processes, soil quality and agriculture. Long-term tillage usually leads to SOC depletion. The purpose of this study was to determine the impact of different land uses on water extractable organic carbon (WEOC) fractions and to evaluate the interaction between the WEOC fractions and other soil properties. Using an extraction procedure at 20°C and 80°C, two fractions were obtained: a cold water extractable organic carbon (CWEOC) and a hot water extractable organic carbon (HWEOC). The results suggest that there is a significant impact from different land uses on WEOC. A lower relative contribution of WEOC in SOC and a lower concentration of labile WEOC fractions are contained in arable soil compared to forestlands. Chernozem soil was characterized by a lower relative contribution of WEOC to the SOC and thus higher SOC stability in contrast to Solonetz and Vertisol soils. Both CWEOC and HWEOC are highly associated with SOC in the silt and clay fraction (<53 µm) and were slightly associated with SOC in the macroaggregate classes. The WEOC fractions were highly and positively correlated with the SOC and mean weight diameter.  相似文献   

Phosphorus-use efficiency of kale genotypes from coastal Croatia     

Branimir Urlić  Gvozden Dumičić  Smiljana Goreta Ban  Marija Romić 《Journal of plant nutrition》2016,39(3):389-398

Understanding the mechanisms of phosphorus (P)-use efficiency (PUE) may contribute to enhancing crop P nutrition because species growth variability at low-P is well known. The experiment was carried out to evaluate the response of kale genotypes to different P supply in randomized block design in three replications. Low-P supply led to a decrease in most parameters, whereas an increase was recorded in root growth parameters. Genotypes differed in shoot dry weight (DW), leaf area, root length and area, and shoot and root P content and concentration. Root traits significantly positively correlated with PUE. Genotypes Red Russian (RR) and IJK 17 were superior in terms of shoot DW production at low P supply, and had the highest uptake efficiency. Genotypes IJK 17 and 81 had the highest P utilization efficiency, while Vates blue curled (VBC) showed the lowest PUE. Genotypes had similar shoot P content and concentration at low P supply, but large PUE differences, implying the importance of P utilization efficiency.  相似文献   

地下水埋深对春玉米田土壤水分及产量的影响   总被引：17，自引：3，他引：17  

巴比江郑大玮  卡热玛·哈木提　孟翀王占生  邱江泉 《水土保持学报》2004,18(3):57-60,65

通过6种地下水位控制处理和对照春玉米试验,探讨了地下水埋深对春玉米农田土壤水分、产量以及水分利用效率的影响。结果表明,地下水埋深对春玉米0～100cm层次土壤水分的影响较大。地下水位越浅这种影响显得越明显;无论地下水埋深深浅,田间累计地下水补给量变化规律可分为4个阶段,即稳定增长期、缓慢增长期、快速增长期和趋于稳定期。地下水位越高,累计地下水补给量越大,土壤排水量越大。较大降雨后土壤开始排水日期随着地下水埋深加深而滞后;地下水埋深1.0m时春玉米产量和水分利用率最高。地下水位在1.0m以下时,水分利用效率随地下水位加深而减少。  相似文献   

重齿小蠹聚集信息素诱捕器的应用技术研究     

陈国发  王艳军  巴达玛  刘广田  周孝明  白永安  牛景富  韩静波  牛月英 《辽宁林业科技》2011,(3):15-17,60

重齿小蠹对人工合成聚集信息素的昼夜反应节律发生在白天7：00～21：00,反应高峰在14：00-19：00,反应模式为＂单峰式—白天型＂;利用人工合成的聚集信息素对重齿小蠹成虫发生期监测表明,成虫扬飞的开始时间为5月20日左右,扬飞高峰期为6月下旬和7月上旬,扬飞末期为8月26日,成虫扬飞的持续期为98 d。2007-2009年大量诱杀防治的试验前、后重齿小蠹致死木平均分别为3.39株/hm2和0.76株/hm2,致死木减少了77.58%,而对照区试验前、后致死木平均分别为15.89株/hm2和18.11株/hm2,致死木增加了13.97%,3 a大量诱杀试验的防治效果显著。  相似文献   

电控发动机尾气检测与故障诊断的研究     

李友才  巴寅亮  林盛长 《新疆农业大学学报》2006,29(3):105-107

为寻求根据汽车尾气参数来诊断汽车故障的方法，利用径向基函数（RBF）神经网络，对丰田雷克萨斯（LEXUS）400电控发动机进行故障诊断研究。研究结果表明，径向基函数神经网络对发动机故障的诊断是迅速、准确的。  相似文献   

Physics. Chameleon magnets     

Žutić I  Cernĕ J 《Science (New York, N.Y.)》2011,332(6033):1040-1041

  相似文献   

Probing the Local Effects of Magnetic Impurities on Superconductivity     

A Yazdani  BA Jones  CP Lutz  MF Crommie  DM Eigler 《Science (New York, N.Y.)》1997,275(5307):1767-1770

The local effects of isolated magnetic adatoms on the electronic properties of the surface of a superconductor were studied with a low-temperature scanning tunneling microscope. Tunneling spectra obtained near magnetic adsorbates reveal the presence of excitations within the superconductor's energy gap that can be detected over a few atomic diameters around the impurity at the surface. These excitations are locally asymmetric with respect to tunneling of electrons and holes. A model calculation based on the Bogoliubov-de Gennes equations can be used to understand the details of the local tunneling spectra.  相似文献   

向海沼泽湿地土壤特征及可持续利用   总被引：3，自引：0，他引：3  

白军红  余国营  张玉霞 《农业现代化研究》2001,22(3):146-149

基于对向海沼津湿地土壤形成条件和主要成土过程的研究，将其沼泽土壤划分为4个亚类型，并分别描述了各自的分布规律和剖面特征。在向海沼泽湿地土壤盐渍化、沙化、退化问题日益严重的大前提下提出了可持续开发利用对策。  相似文献   

基于SSR和SRAP标记的苹果品种亲缘关系分析   总被引：1，自引：0，他引：1       下载免费PDF全文

巴巧瑞  赵政阳  高华 《西北农林科技大学学报(自然科学版)》2011,39(9):123-128

【目的】用SSR和SRAP分子标记技术,分析苹果(Malus domestica Borkh.)重要栽培品种的亲缘关系,为苹果杂交育种亲本及组合的选配提供参考。【方法】用亲缘关系较近的金冠和秦冠筛选SSR和SRAP多态性引物,利用SSR和SRAP分子标记技术对37个苹果栽培品种进行遗传多样性和亲缘关系分析。【结果】筛选出了用于37个苹果主栽品种亲缘关系分析的10对SSR和10对SRAP引物,其分别产生56和64条扩增带,平均多态性比率分别为61.09%和70.8%。根据SSR+SRAP分析结果,37个苹果品种被聚为6大类。【结论】所选取的引物能够有效地揭示供试苹果品种的遗传多样性,并且苹果品种分类与传统系谱基本一致。  相似文献