康复绿地规划设计分析——以华西医院永宁院区康复绿地设计为例

从医院未来发展来说,医院的外环境品质将是病人选择前来就诊的一个重要因素.优美的医院环境可以间接或直接影响患者的心理和生理,从而促进患者的治疗和康复,良好的医院环境作为医疗不可分割的一部分,起着至关重要的作用,这尤其体现在康复医院中.规划建设康复绿地提倡园艺疗法如:“森林浴”在我国是一个新兴事物,分析华西永宁院区康复绿地规划建设实践与总结可为医院康复绿地规划建设者提供经验和借鉴.     

山杨、桦树地径与直径相关关系的研究

利用 10块山杨、桦树 (简称杨桦 )天然混交次生林标准地的实测资料 ,对两树种地径与直径的关系进行了研究 ,并建立了相应的线性模型 ,其相关系数均在 0 99以上 ,拟合效果良好 ,为林业科研和生产提供了可靠的依据     

不同覆盖物对果树越冬的保温作用

在克拉玛依市乌尔禾区,于2006～2007年冬季,采用不同覆盖材料,进行了黑塑料布、双膜彩条布、单膜彩条布和紧贴式双层塑料布覆盖下的最低温度和温差的逐日观测,以减轻果树越冬掩埋的劳动强度。结果表明:最低气温平均值是黑塑料布-5.9℃,双膜彩条布-7.3℃,单膜彩条布-9.3℃,紧贴式双层-6.6℃,裸露的气温-17.9℃。温差平均值是黑塑料布-2.8℃,双膜彩条布-2.6℃,单膜彩条布-4.8℃,紧贴式双层-3.7℃,裸露的气温-10.0℃。试验表明,黑塑料布的保温效果好,温差也小。单膜彩条布的保温效果最差,温差也最大,有转暖乍冷的不良影响。紧贴式双层塑料布的保温效果因为与单层黑塑料布相同,并且多浪费一层覆盖材料和多费工时而被否定。     

控释肥配施玉米秸秆对麦季土壤酶活性及养分的影响

为了探究控释尿素掺混肥与玉米秸秆长期互作对麦季土壤酶活性和土壤养分状况的影响,基于华北平原棕壤区小麦—玉米轮作8年定位施肥试验,对比研究了玉米秸秆还田(S)与不还田条件下施用控释尿素掺混肥(CRF)与普通尿素掺混肥(BBF)对麦季土壤酶活性及土壤养分的影响。结果表明:秸秆不还田条件下,CRF处理较BBF处理显著提高土壤中性磷酸酶(返青期和成熟期)、蔗糖酶(返青期和孕穗期)和纤维素酶(返青期和孕穗期)活性及成熟期有机质、硝态氮和有效磷含量,其中,成熟期中性磷酸酶活性显著提高29.6%,硝态氮含量显著提高34.8%。秸秆还田条件下,BBF+S处理成熟期脲酶、纤维素酶,孕穗期中性磷酸酶活性显著高于CRF+S处理,其他时期2种类型掺混肥土壤酶活性无显著差异。CRF+S处理成熟期土壤全氮、有机质、硝态氮和有效磷含量显著高于BBF+S处理。氮肥种类和玉米秸秆还田的交互作用对土壤中性磷酸酶、蔗糖酶和纤维素酶活性及土壤全氮、硝态氮、铵态氮、有效磷和速效钾含量影响显著,秸秆还田较不还田处理显著提高中性磷酸酶、蔗糖酶活性、速效钾和有效磷含量。综上表明,玉米秸秆还田和不还田条件下控释尿素掺混肥较普通尿素掺混肥处理均能显著增加土壤有机质含量,提高小麦后期速效氮磷养分的供应强度和供应容量,其中玉米秸秆还田配施控释尿素掺混肥处理在提高土壤酶活性和土壤养分方面表现最优。研究结果可为秸秆还田下氮肥优化施用提供理论依据。     

Effect of idazoxan on permeability of inflammatory blood-brain barrier model in vitro

AIM: To study the effect of idazoxan on the permeability of inflammatory blood-brain barrier (BBB) model in vitro and the expression of tight junction protein ZO-1.METHODS: In vitro BBB model was established by murine brain endothelial cell line bEnd.3 incubated for 7 d. The cells were treated with TNF-α (10 nmol/L) for additional 24 h to establish the inflammatory BBB model, which was pretreated with IDA at doses of 50, 100 and 200 μmol/L, respectively. The permeability was measured using fluorescein isothiocyanate-conjugated dextran (FD-40, MW 40,000), the expression of ZO-1 was detected by Western blot analysis, the distribution of ZO-1 was observed by immunofluorescence, and the mRNA expression of MMP-9/TIMP-1 was measured by RT-PCR.RESULTS: After incubated for 7 d, b.End3 cells converged to be confluent monolayer with low permeability. The inflammatory BBB model induced by TNF-α treatment displayed much higher permeability with decreased expression of tight junction protein ZO-1, destroyed distribution of ZO-1 and increased mRNA expression of MMP-9. When pretreated with IDA, the permeability was greatly decreased, the expression of ZO-1 was greatly increased, the abnormal distribution of ZO-1 was greatly ameliorated and the mRNA expression of MMP-9 was obviously reduced. The effect was most significant in IDA (200 μmol/L)-pretreated group (P<0.01).CONCLUSION: IDA directly acts on brain endothelial cells to reduce the expression of MMP-9, increase the expression of tight junction protein ZO-1 and ameliorate the destroyed distribution of ZO-1 in the inflammatory BBB, thus reversing the abnormally elevated permeability in a inflammatory BBB model in vitro induced by TNF-α.     

Effect of the L-D1 alleles on leaf morphology,canopy structure and photosynthetic productivity in upland cotton (Gossypium hirsutum L.)

One of the most important objectives for breeders is to develop high-yield cultivars.The increase in crop yield has met with bottlenecks after the first green revolution,and more recent efforts have been focusing on achieving high photosynthetic efficiency traits in order to enhance the yield.Leaf shape is a significant agronomic trait of upland cotton that affects plant and canopy architecture,yield,and other production attributes.The major leaf shape types,including normal,sub-okra,okra,and su...     

外源SNP对低温下马铃薯试管苗相关酶活性的影响

以陇薯3号和陇薯6号为试验材料,研究了0.05、0.10 mmol/L SNP对4 ℃低温条件下马铃薯试管苗超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性的影响。结果表明,SNP可促进SOD、POD、CAT活性提高,减轻低温胁迫对细胞的氧化损伤度,加快细胞修复速度,促进试管苗生长。SNP浓度以0.05 mmol/L最佳。     

辣木内生真菌产生抗菌物质的生物学特性研究

从辣木(Moringa sp.)中分离得到一株内生真菌(Aspergillus sp.),其发酵液对金黄色葡萄球菌和绿脓杆菌的生长有很强的抑制作用。曲霉ly14发酵液抑菌效果的最适碳源是麦芽糖,最适氮源是玉米浆,最适初始pH为5,最适装液量为50 mL和最适培养时间160 h,但生长因子(叶酸和VB12除外)和无机盐离子并不促进发酵夜得抑菌效果。     

九连山国家森林公园负氧离子浓度时空变化及影响要素研究

负氧离子不仅对空气质量具有改善作用,而且对人体健康起到重要的影响。通过连续观测九连山国家森林公园空气负氧离子浓度,分析负氧离子浓度的时空变化规律及与各气象要素之间的相互关系。结果表明,九连山国家森林公园负氧离子浓度水平达到Ⅰ级标准,对人体健康极有利。原始阔叶林中负氧离子浓度明显高于人工林中负氧离子的浓度,且原始阔叶林和人工林中负氧离子浓度都呈现夏秋高于冬春,夏季最高,冬季最低;早晚浓度明显高于白天浓度的规律。因此九连山国家森林公园适合出游时间为夏秋季,且上午或傍晚最佳。此外,负氧离子的浓度与空气温度、湿度以及降水量都有明显的相关性,同时也受其他气象因素的影响。这些结果可以为推进森林旅游业的建设提供科学支持,特别是自然保护区内负氧离子资源和旅游产品的开发。