Analysis of tidal breathing flow volume loop in dogs with tracheal masses

Objectives To investigate whether there are any changes in the tidal breathing flow volume loop (TBFVL) in calm, non-dyspnoeic dogs with intratracheal masses. Methods We compared 4 dogs with intratracheal masses (group 1) with 10 healthy dogs (group 2). Routine clinical and laboratory examinations of the dogs were unremarkable, except for episodic upper respiratory obstructive signs in the dogs in group 1. Lateral radiography of the neck and thorax showed that group 1 dogs had masses that appeared to protrude into the tracheal lumen. Tracheoscopy and surgery or necropsy was performed to confirm the presence of the mass. Arterial blood gas and TBFVL analysis was carried out in all dogs to assess respiratory status. Results The shape of the TBFVL for dogs in group 1 was narrower and ovoid compared with that for the group 2 dogs. Tidal volume and expiratory and inspiratory times were significantly reduced, whereas the respiratory rate was increased for dogs in group 1 compared with dogs in group 2. Arterial blood gas analysis was unremarkable for all dogs. Conclusions TBFVL is a non-invasive technique that is easy to perform and well tolerated by dogs. In the absence of abnormalities detected by routine diagnostic evaluations and arterial blood gas analysis in dogs with intratracheal masses, the TBFVL contributes to the definition of the physiologic status of the airways at the time of testing, and results suggests that these dogs breathe quite normally when they are calm and non-dyspnoeic.     

Resistance to fusarium basal rot of onion in greenhouse and field and associated expression of antifungal compounds

Greenhouse and field evaluations of onion for resistance to Fusarium basal rot caused byFusarium oxysporum f.sp.cepae were conducted on cultivars ‘Akgün 12’ and ‘Rossa Savonese’ previously described as resistant at the seedling stage. In the greenhouse experiments inoculations were carried out on seeds or soil; in the field experiments evaluation was performed on onion sets from plants grown in naturally infested soils. Akgün 12 and to a lesser extent Rossa Savonese were resistant to the disease at the bulb stage in all experiments. Results were also consistent with those obtained from a previous screening at the seedling stage. Onion sets were also extracted and fractionated by thin layer chromatography to determine their content of antifungal compounds. Extracts were characterized by the expression of distinct antifungal components, which may be involved in resistance to the pathogen. http://www.phytoparasitica.org posting July 14, 2004.     

设施栽培增施二氧化碳对西芹影响研究

设施栽培中CO2普遍亏缺,对云南设施内变化监测表明,最高浓度可达414μL／L,最低为240μL／L,与外界差异显著。对西芹增施不同浓度的CO2后,在浓度为1200μL／L时,西芹的株高、茎粗、产量、效益分别比CK增加14.1％、12.9％、35.9％、35.4％,西芹的可溶性糖增加12．0％,粗纤维降低8．3％．CO2对西芹的相关性分析表明,CO2对西芹的单株重、产量影响最显著,其次是对效益、株高和茎粗的影响,相关系数R^2都达到了0．8以上．     

日光温室黄瓜新品种津优31号的选育

津优 31号是由自交系C6与M - 6配制而成的黄瓜一代杂种。该品种植株生长势强 ,早熟、丰产 ,耐低温弱光性能优良 ,抗霜霉病、白粉病、黑星病 ,高抗枯萎病。瓜条顺直、瓜把短 ,皮色深绿 ,有光泽 ,刺密、瘤中等 ,品质佳 ,纵径 33cm ,单瓜质量 180g左右。每 6 6 7m2 产黄瓜 80 0 0kg左右 ,适于日光温室越冬茬及早春茬栽培     

杏温室栽培品种选择及配套技术研究

从温室内高接的42个品种中筛选出适宜在薄膜温室栽培的杏品种‘9803’和4个授粉品种。研究结果表明:9803杏的低温需求量为490C.U;温室内杏花芽分化的时期在果实采收后10～15d;温室内的适宜树形为纺锤形及延迟开心形;花粉的贮藏最好方法为纸包装加塑料袋密封贮藏,授粉方法为蜜蜂授粉,在授粉品种与主栽品种花期不遇的情况下可利用贮藏花粉进行人工授粉。温室栽培9803杏品种,在4月中旬成熟,比露地提早60d。     

日光温室甜樱桃生长发育节律研究

 甜樱桃在日光温室条件下, 自升温(植株通过休眠后, 揭开草帘让日光透过棚膜射入温室内使温度上升) 开始到开花约30 d , 花期持续10～14 d ; 开花后17～21 d 生理落果; 生理落果至果实着色29～43 d (年度间差异大) ; 着色到成熟约10 d。新梢呈典型“双S 型”生长, 第2 次旺长为补偿性旺长, 强度远大于第1 次, 新梢腋芽大量萌发, 节间较长。新根数量在揭膜后迅速下降, 与枝叶早衰相关, 新梢补偿性生长后又上升, 但强度远不及盖膜阶段。     

大棚蔬菜连作年限对土壤主要理化性状的影响

采用面上调查和定点观测相结合的方法,分别对哈尔滨郊区不同连作（轮作）年限的大棚土壤的主要养分含量状况、酶活性、水稳性团粒分级及盐积状况进行研究分析。结果表明,随着连作年限的增加,土壤主要养分含量有增加的趋势,土壤脲酶活性、中性磷酸酶、酸性磷酸酶活性也有增加的趋势;２～０．２５ｍｍ水稳性团粒增加,土壤物理结构性能有所改善;土壤化学性状变劣,出现了盐类积累。     

Treatment of premature calves with clinically diagnosed respiratory distress syndrome

BACKGROUND: Respiratory distress syndrome (RDS) has been reported previously in premature calves. However, there have been no published data on the effect of surfactant replacement therapy in the treatment of premature calves with RDS. HYPOTHESIS: Surfactant replacement therapy added to the standard treatment for premature calves clinically diagnosed with RDS would increase the viability of the calves. ANIMALS: Twenty-seven premature calves with clinically diagnosed RDS. METHODS: Twenty calves were instilled intratracheally with bovine lung surfactant extract and provided with standard treatment for RDS (surfactant group). Seven calves were given only standard care for RDS without surfactant therapy and placed in the control group. Standard treatment for newborn calves with RDS includes warming, administration of intranasal oxygen, fluid replacement, administration of antibiotics, and immunoglobulin solution. Arterial blood samples were collected from the calves at 3 observation points, the first just before treatment (hour 0) and at 2 hours (hour 2) and 24 hours (hour 24) after treatment was started to determine if ventilation was adequate, improving, or deteriorating. Blood gases, pH, bicarbonate, and lactate concentrations were measured. RESULTS: In the surfactant group, mean partial pressure of oxygen significantly increased at hours 2 and 24. Mean partial pressure of carbon dioxide decreased and mean arterial blood pH increased at hour 24 in the surfactant group compared with the control group (P < .05). Of the 20 calves in the surfactant group, 12 survived and 8 died. All 7 calves in the control group died. CONCLUSIONS AND CLINICAL IMPORTANCE: The results of this study suggest that surfactant replacement therapy may reduce neonatal deaths in premature calves with clinically diagnosed RDS.     

日光温室朝向对进光量的影响分析

在高纬度地区冬季凌晨气温比傍晚低 ,在管理上 ,上午揭帘时间较晚 ,使得温室内下午实际日照时间比上午长。温室内下午日照时间较上午日照时间每增加 0 .2 5 h,获得最大进光量的温室朝向应相应偏西增加 1°。以沈阳地区 (41°4 6′N )为例 ,分析表明在计算条件下 ,在南偏西 5°～ 6°时 ,进光量最大 ,与正南向温室进光量相比 ,增加约 0 .3%。     

日光温室载荷的模拟研究

通过日光温室载荷的分析,建立了载荷计算的力学模型,利用计算机模拟的方法,对各种形状的温室进行模拟分析,探讨了各种设计参数对温室结构性能的影响。