基于GIS的瓦房店市耕地资源管理信息系统的建立     

贾树海  白静  李秀凤  周德  孟维军  张琦 《湖北农业科学》2009,48(3)

以辽宁省瓦房店市为例,采用MapInfo作为技术平台,运用MapBasic语言编程,建立了涵盖气候、水文、地形地貌、土壤、农业基础设施建设和土地利用现状等信息的县域耕地资源管理信息系统.该系统以1:10 000的土地利用现状图为工作底图,具体包括基础地理信息、土壤环境信息、土壤属性信息、专项评价信息、信息查询服务和施肥专家咨询6部分信息,实现了对瓦房店市耕地资源高效、系统的管理.  相似文献   

荷叶离褶伞菌丝最佳生长条件研究   总被引：2，自引：0，他引：2  

李永红  柴红梅  何德  赵永昌 《西南农业学报》2009,22(2)

本文研究了菌丝生长所需要的碳源、氮源、无机盐、pH值以及离褶伞子实体浸出液对荷叶离褶伞菌丝生长的影响。结果表明,荷叶离褶伞菌丝生长最适碳源是葡萄糖,最适氮源是蛋白胨,每1000mL培养基中加入1g磷酸二氢钾或1g氯化钙能促进菌丝生长;菌丝在pH值5—9都能生长,但在酸性环境下生长较好;加入离褶伞子实体漫出液对荷叶离褶伞菌丝生长促进作用明显。  相似文献   

Effects of C:N ratio and substrate integration on periphyton biomass, microbial dynamics and growth of Penaeus monodon juveniles     

P. S. Shyne Anand  Sujeet Kumar  A. Panigrahi  T. K. Ghoshal  J. Syama Dayal  G. Biswas  J. K. Sundaray  D. De  R. Ananda Raja  A. D. Deo  S. M. Pillai  P. Ravichandran 《Aquaculture International》2013,21(2):511-524

An outdoor growth trial was conducted for 75 days to investigate the effect of C:N ratio and bamboo substrate (S) in brackish water shrimp culture. Penaeus monodon juveniles (0.35 ± 0.03 g) were stocked in experimental tanks with and without bamboo substrate. C:N ratio of 10 and 20 was manipulated with shrimp feed containing 32 % crude protein and rice flour as carbohydrate source. Addition of substrate and higher C:N ratio (CN20+S) significantly reduced (p < 0.01) inorganic nitrogen NH₃–N by 48.2 %, NO₃–N by 41.6 %, NO₂–N by 42.7 % compared with CN10. Substrate addition significantly (p < 0.05) reduced the turbidity by 22.4 % (CN10+S against CN10) and 20.7 % (CN20+S against CN20). Periphyton biomass and total heterotrophic bacterial load were significantly higher (p < 0.05) in CN20+S in comparison with CN10+S treatment. The autotrophic index increased from 123.4 ± 0.62 to 158.9 ± 3.8 for CN10+S and, 121.8 ± 1.6 to 228 ± 9.11 for CN20+S system. Provision of substrate and carbohydrate addition resulted in the highest body weight, 4.87 ± 0.12 g in CN20+S against 3.66 ± 0.07 g in CN20 and 2.90 ± 0.12 g in CN10 through provision of natural food in the form of periphytic algae and heterotrophic bacterial community. Treatment with substrates showed a higher survival rate by 7 % in comparison with without substrate treatments as it acted as shelter to shrimp during molting and there by reduced cannibalism. Thus, our results demonstrated that high C:N ratio and substrate addition improved growth, reduced FCR and better water quality conditions.  相似文献   

Enteroendocrine profile of α-transducin immunoreactive cells in the gastrointestinal tract of the European sea bass (Dicentrarchus labrax)     

Rocco Latorre  Maurizio Mazzoni  Roberto De Giorgio  Claudia Vallorani  Alessio Bonaldo  Pier Paolo Gatta  Roberto Corinaldesi  Eugenio Ruggeri  Chiara Bernardini  Roberto Chiocchetti  Catia Sternini  Paolo Clavenzani 《Fish physiology and biochemistry》2013,39(6):1555-1565

In vertebrates, chemosensitivity of nutrients occurs through the activation of taste receptors coupled with G-protein subunits, including α-transducin (G_αtran) and α-gustducin (G_αgust). This study was aimed at characterising the cells expressing G_αtran immunoreactivity throughout the mucosa of the sea bass gastrointestinal tract. G_αtran immunoreactive cells were mainly found in the stomach, and a lower number of immunopositive cells were detected in the intestine. Some G_αtran immunoreactive cells in the stomach contained G_αgust immunoreactivity. Gastric G_αtran immunoreactive cells co-expressed ghrelin, obestatin and 5-hydroxytryptamine immunoreactivity. In contrast, G_αtran immunopositive cells did not contain somatostatin, gastrin/cholecystokinin, glucagon-like peptide-1, substance P or calcitonin gene-related peptide immunoreactivity in any investigated segments of the sea bass gastrointestinal tract. Specificity of G_αtran and G_αgust antisera was determined by Western blot analysis, which identified two bands at the theoretical molecular weight of ~45 and ~40 kDa, respectively, in sea bass gut tissue as well as in positive tissue, and by immunoblocking with the respective peptide, which prevented immunostaining. The results of the present study provide a molecular and morphological basis for a role of taste-related molecules in chemosensing in the sea bass gastrointestinal tract.  相似文献   

中麦175馒头和面条品质稳定性分析   总被引：1，自引：0，他引：1  

张艳  陈新民  绍凤成  王德森  何中虎 《麦类作物学报》2012,32(3):440-447

为给优质小麦育种和生产提供参考依据,以优质小麦新品种中麦175于2010-2011年度在河北和北京14个地点的样品为材料,分析了磨粉品质、面粉和面片颜色、面团流变学和淀粉糊化特性、馒头和面条加工品质。结果表明,中麦175为馒头和面条兼用型优质品种,特点是软质、中偏弱的面筋强度、面粉颜色白,多数品质性状较稳定,籽粒硬度、PPO活性、面片a*值、稳定时间、拉伸面积、延展性和最大抗延阻力的变异系数较大,馒头加工品质地点间变异大于面条。磨粉品质和面团流变学参数对馒头加工品质有显著影响,籽粒硬度和出粉率对馒头表面颜色有显著负向影响,相关系数分别为-0.82(P<0.01)和-0.58(P<0.05);面粉L*值高,馒头加工品质好,二者相关系数为0.72(P<0.01);吸水率与馒头总分呈显著负相关(r=-0.84,P<0.01),稳定时间、拉伸面积、延展性和最大抗延阻力与馒头总分呈显著正相关,相关系数分别为0.85(P<0.01)、0.77(P<0.01)、0.62(P<0.05)和0.70(P<0.01)。降低PPO活性和吸水率,提高蛋白质含量、出粉率和黄色素含量可以改善面粉和面片颜色的亮白度,增加部分黄度,形成消费者可接受的奶白色。淀粉糊化特性对馒头和面条加工品质无显著影响。上述信息对改良小麦品质的稳定性有重要意义。  相似文献   

Leucettamols, Bifunctionalized Marine Sphingoids, Act as Modulators of TRPA1 and TRPM8 Channels     

Giuseppina Chianese  Ernesto Fattorusso  Masteria Yunovilsa Putra  Barbara Calcinai  Giorgio Bavestrello  Aniello Schiano Moriello  Luciano De Petrocellis  Vincenzo Di Marzo  Orazio Taglialatela-Scafati 《Marine drugs》2012,10(11):2435-2447

Leucettamols, bifunctionalized sphingoid-like compounds obtained from a marine sponge Leucetta sp., act as non-electrophilic activators of the TRPA1 channel and potent inhibitors of the icilin-mediated activation of the TRPM8 channel, while they are inactive on CB₁, CB₂ and TRPV1 receptors. Leucettamols represent the first compounds of marine origin to target TRPA1 and the first class of natural products to inhibit TRPM8 channels. The preparation of a small series of semi-synthetic derivatives revealed interesting details on the structure-activity relationships within this new chemotype of simple acyclic TRP modulators.  相似文献   

竹叶叶绿素荧光季节变化的模型设计     

Davina Van Goethem  Sebastiaan De Smedt  Roland Valcke  Denis O'Connor  Pat O'Connell  Sonja Denollin  Roeland Samson  Geert Potters 《世界竹藤通讯》2012,10(5):46

在寻找可再生能源和生物基材料方面,竹子已经被作为一种高产的生物质产品,可以用来作为土壤污染的修复性植物。由于这个原因,一个产量指示的增长模型需要一个健康的指标参数来检测植物的性能。因此,本研究对位于爱尔兰都伯林的Ballyboughalo公司的毛竹蒿草(Phyllostachys humilis)叶子的叶绿素荧光进行了测量。本研究测量结果涵盖了这种竹类每个节点的叶子,并且建立在了随季节性变化的基础上。最常使用的叶绿素荧光参数是Fv/Fm值,又称TRO/ABS (即被困的光子与吸收的光子数之比)。随季节的推移以及这个参数较大的变化,本研究将春天与一年中其它的季节进行对比观察测量。在过去的一年,这种植物的上部叶片比下部叶片表现更好。本研究的发现被整合在一个数学模型中,其目的是为预测和解释在其它立地条件下的植物的性能。  相似文献   

Modelling the distribution of the pan‐continental invasive fish Pseudorasbora parva based on landscape features in the northern Kyushu Island,Japan     

Shinji Fukuda  Bernard De Baets  Norio Onikura  Jun Nakajima  Takahiko Mukai  ANS M. Mouton 《水产资源保护:海洋与淡水生态系统》2013,23(6):901-910

安徽省淮北平原夏玉米主要生育时期旱涝指标与影响评估   总被引：9，自引：2，他引：7  

李德祁宦  马晓群 《中国农学通报》2013,29(17):208-216

为给淮北平原夏玉米高产稳产和防灾减灾以及保险理赔等工作提供参考依据。利用1961—2010年安徽省淮北平原夏玉米生育期间降水资料,采用积分回归分析方法确定了逐旬降水量对夏玉米的增产或减产效应及其影响的关键时段,同时采取降水概率≤20%与≥80%分位数法设计了夏玉米不同生育时段及其全生育期间旱与涝的气候指标,统计分析了夏玉米旱与涝灾的区域分布和灾损率及其风险分布特征。结果表明：淮北平原夏玉米生育期间逐旬降水量的负效应多于正效应,抽雄—乳熟期间降水对夏玉米产量影响显著,期间发生旱或涝灾的减产率分别为12.6%和16.3%。淮北平原夏玉米播种—出苗、苗期—拔节、拔节—抽雄、抽雄—成熟和全生育期旱灾与涝灾的气候指标分别是各自时段内的降水总量≤17.0、≤50.0、≤95.0、≤110.0、≤370.0 mm和≥95.0、≥235.0、≥265.0、≥280.0、≥740.0 mm。淮北平原夏玉米生育期间涝灾多于旱灾,且旱灾与涝灾风险分别呈经向和纬向分布,全生育期旱灾与涝灾的气象相对减产率分别为-22.4%和-28.9%,其他生育时段旱与涝灾的气象相对减产率在-8%~-16%之间。  相似文献   

灵芝液体发酵培养基筛选研究   总被引：2，自引：0，他引：2  

杨德  周明  高虹  史德芳  郭鹏  李露  薛淑静 《安徽农业科学》2011,39(30):18536-18538

[目的]优选灵芝液体发酵的最优培养基。[方法]以不同碳源的培养基培养灵芝,研究不同碳源对灵芝液体发酵菌丝生长情况及生物量和多糖含量的影响。[结果]玉米粉水解液发酵得到的灵芝菌丝体生物量最大;不同培养基发酵得到的菌丝体生物量大小顺序为玉米水解液〉玉米粉〉葡萄糖＋玉米粉〉蔗糖＋玉米粉〉麦芽糖＋玉米粉〉葡萄糖＋麦芽糖〉蔗糖;灵芝菌丝体多糖含量顺序为麦芽糖＋玉米粉〉葡萄糖＋玉米粉〉玉米粉〉玉米水解液〉葡萄糖。综合各方面因素,选择玉米粉为灵芝液体发酵的最优培养基。[结论]筛选出灵芝液体发酵的最佳培养基为以玉米粉为碳源的培养基。  相似文献