表面活性剂辅助的甲硫氨酸和色氨酸叶面喷施对芥蓝生长及菜薹芥子油苷组分和含量的影响   总被引：1，自引：1，他引：0       下载免费PDF全文

腊贵晓  孔海民  方萍  杨铁钢 《中国生态农业学报》2014,22(4):439-446

采用盆栽试验,研究了脂肪族芥子油苷和吲哚族芥子油苷的合成前体甲硫氨酸和色氨酸单独及配合表面活性剂叶面喷施对芥蓝(Brassica alboglabra L.)生长及菜薹中芥子油苷组分和含量的影响。结果表明,各处理对芥蓝生长指标及芥子油苷组分无显著影响,在芥蓝菜薹中均检测到7种脂肪族芥子油苷和4种吲哚族芥子油苷。与喷施清水对照相比,甲硫氨酸、色氨酸单独叶面喷施及表面活性剂辅助的色氨酸叶面喷施,对芥蓝菜薹总芥子油苷含量、总脂肪族芥子油苷含量和总吲哚族芥子油苷含量均无显著影响。表面活性剂辅助下甲硫氨酸叶面喷施处理中菜薹总芥子油苷和总脂肪族芥子油苷含量比清水对照处理分别提高28.5%和31.9%,其中在11种芥子油苷中脂肪族芥子油苷3-丁烯基芥子油苷含量提高幅度最大,达到44.3%,同时表面活性剂辅助下甲硫氨酸叶面喷施显著提高了芥蓝菜薹全硫含量并降低了氮硫比(N/S)。本试验结果表明,有效供给甲硫氨酸能明显促进脂肪族芥子油苷的合成和积累,而辅之以表面活性剂能增进叶面对甲硫氨酸的吸收效果,其影响机理还有待进一步研究。  相似文献   

西藏草地资源价值及退化损失评估   总被引：3，自引：0，他引：3  

李忠魁  拉西 《中国草地学报》2009,31(2)

用4类共13个指标评估了西藏草地资源的价值,并根据草地资源退化速率评估了草地价值年损失量.结果表明,西藏草地资源的价值为1080.33×108元·a-1,包括:调节功能价值884.4989×108元·a-1(81.87%);实物提供价值173.2957×108元·a-1(16.04%);支持功能价值18.6253×108元·a-1(1.72%);旅游功能价值3.91×108元·a-1(0.36%).其中,调节功能的价值由6项组成(空气质量调节未计算),依大小次序排列为土壤碳累积、蓄水、营养物质循环、土壤保持、废弃物降解和养分归还.总体来看,草地资源的文化功能和支持功能有待进一步发展.西藏草地资源的总价值(现值)为11883.63亿元,退化损失的价值为2376.726亿元,年草地资源退化损失价值为297.091亿元.  相似文献   

胎儿期与成年期蒙古马骨骼肌肌纤维类型转化研究     

丁文淇  图格琴  任秀娟  陶克涛  拉希玛  贾紫洁  安塔娜  铁木齐尔·阿尔滕齐米克  韩海格  陶娜拉  芒来  白东义 《畜牧兽医学报》2022,53(1):88-99

为探索影响蒙古马胎儿期和成年期肌纤维类型差异机理.本研究选取3匹4月龄胎儿(两母一公)与3匹5岁健康成年母马身体4块分布全身、具有代表性的肌肉组织(长臂三头肌、夹肌、背最长肌、臀中肌)作为一个整体.胎儿期蒙古马肌纤维和成年期蒙古马肌纤维因存在差异各做为一组,试验进行3个生物学重复.首先对蒙古马骨骼肌肌肉样品进行免疫组化...  相似文献   

实验室计量认证（复审）——规范化管理方法的探讨     

杨凯  贾生军  王育杰  拉多杰  赵德娟  任珊 《青海农林科技》2012,(2):51-53

以实验室规范化管理工作中积累的一些经验为基础,对实验室计量认证（复审）工作进行了认真的探讨,确定建立符合实验室资质认定评审准则的质量体系,按体系文件进行检测工作全程序质量控制,以期探索出一种操作性强并具有广泛普及意义的“实验室规范化管理方法”。  相似文献   

A COMPARATIVE STUDY OF NUMERICAL CLASSIFICATION AND ORDINATION OF SOIL PROFILES IN A LOCALITY NEAR OXFORD     

H. E. CUANALO DE  LA C. R. WEBSTER 《European Journal of Soil Science》1970,21(2):340-352

Data for 85 soil profiles, located at random within 17 physiographic units in a 1,000 km² area near Oxford, and each characterized by 37 properties, were analysed by two sets of multivariate techniques. Principal component analysis yielded two components accounting for 44 per cent of the total variation, and the distribution of the profiles along these components is plotted as a scatter diagram (ordination). Similarity analysis and hierarchical grouping (classification) were performed using three different similarity indices, two different standardization techniques, and three different sorting strategies. Before analysis the profiles were classified by two pedologists, independently using their judgement. For the Brown Earths there was moderately good agreement between the results of the two prior classifications and between them and those produced by the several numerical procedures. The degree of clustering was slight and much less than imagined prior to analysis. For the Gleys there was no evident clustering. Different numerical procedures gave different results, as also did the two prior classifications. Pedologists faced with difficult classificatory decisions cannot look to any hierarchical clustering strategy as arbiter, though they should get guidance from a principal component plot.  相似文献   

Neoformed aragonite in clay soils on Keuper materials from east-central Spain   总被引：1，自引：0，他引：1  

H. A. LAYA  J. A. DE LA  PEÑA J. BENAYAS† 《European Journal of Soil Science》1992,43(3):401-407

Fibrous radial aragonite nodules occur in a toposequence developed in the Triassic (Keuper) in a subhumid mediterranean climate (Soria, Spain). Neoformation in situ of the nodules in these soils is proposed, on micromorphological and physico-chemical grounds, such as their fragility, the inclusion of material from the groundmass, their occurrence along cracks and their high Mg: Ca ratio.  相似文献   

A new look at the saturn system: the voyager 2 images     

Smith BA  Soderblom L  Batson R  Bridges P  Inge J  Masursky H  Shoemaker E  Beebe R  Boyce J  Briggs G  Bunker A  Collins SA  Hansen CJ  Johnson TV  Mitchell JL  Terrile RJ  Cook AF  Cuzzi J  Pollack JB  Danielson GE  Ingersoll AP  Davies ME  Hunt GE  Morrison D  Owen T  Sagan C  Veverka J  Strom R  Suomi VE 《Science (New York, N.Y.)》1982,215(4532):504-537

Voyager 2 photography has complemented that of Voyager I in revealing many additional characteristics of Saturn and its satellites and rings. Saturn's atmosphere contains persistent oval cloud features reminiscent of features on Jupiter. Smaller irregular features track out a pattern of zonal winds that is symmetric about Saturn's equator and appears to extend to great depth. Winds are predominantly eastward and reach 500 meters per second at the equator. Titan has several haze layers with significantly varying optical properties and a northern polar "collar" that is dark at short wavelengths. Several satellites have been photographed at substantially improved resolution. Enceladus' surface ranges from old, densely cratered terrain to relatively young, uncratered plains crossed by grooves and faults. Tethys has a crater 400 kilometers in diameter whose floor has domed to match Tethys' surface curvature and a deep trench that extends at least 270 degrees around Tethys' circumference. Hyperion is cratered and irregular in shape. Iapetus' bright, trailing hemisphere includes several dark-floored craters, and Phoebe has a very low albedo and rotates in the direction opposite to that of its orbital revolution with a period of 9 hours. Within Saturn's rings, the "birth" of a spoke has been observed, and surprising azimuthal and time variability is found in the ringlet structure of the outer B ring. These observations lead to speculations about Saturn's internal structure and about the collisional and thermal history of the rings and satellites.  相似文献   

The jupiter system through the eyes of voyager 1     

Smith BA  Soderblom LA  Johnson TV  Ingersoll AP  Collins SA  Shoemaker EM  Hunt GE  Masursky H  Carr MH  Davies ME  Cook AF  Boyce J  Danielson GE  Owen T  Sagan C  Beebe RF  Veverka J  Strom RG  McCauley JF  Morrison D  Briggs GA  Suomi VE 《Science (New York, N.Y.)》1979,204(4396):951-972

The cameras aboard Voyager 1 have provided a closeup view of the Jupiter system, revealing heretofore unknown characteristics and phenomena associated with the planet's atmosphere and the surfaces of its five major satellites. On Jupiter itself, atmospheric motions-the interaction of cloud systems-display complex vorticity. On its dark side, lightning and auroras are observed. A ring was discovered surrounding Jupiter. The satellite surfaces display dramatic differences including extensive active volcanismn on Io, complex tectonism on Ganymnede and possibly Europa, and flattened remnants of enormous impact features on Callisto.  相似文献   

Voyager 2 at neptune: imaging science results     

Smith BA  Soderblom LA  Banfield D  Barnet C  Basilevsky AT  Beebe RF  Bollinger K  Boyce JM  Brahic A  Briggs GA  Brown RH  Chyba C  Collins SA  Colvin T  Cook AF  Crisp D  Croft SK  Cruikshank D  Cuzzi JN  Danielson GE  Davies ME  De Jong E  Dones L  Godfrey D  Goguen J  Grenier I  Haemmerle VR  Hammel H  Hansen CJ  Helfenstein CP  Howell C  Hunt GE  Ingersoll AP  Johnson TV  Kargel J  Kirk R  Kuehn DI  Limaye S  Masursky H  McEwen A  Morrison D  Owen T  Owen W  Pollack JB  Porco CC  Rages K  Rogers P  Rudy D  Sagan C  Schwartz J 《Science (New York, N.Y.)》1989,246(4936):1422-1449

Voyager 2 images of Neptune reveal a windy planet characterized by bright clouds of methane ice suspended in an exceptionally clear atmosphere above a lower deck of hydrogen sulfide or ammonia ices. Neptune's atmosphere is dominated by a large anticyclonic storm system that has been named the Great Dark Spot (GDS). About the same size as Earth in extent, the GDS bears both many similarities and some differences to the Great Red Spot of Jupiter. Neptune's zonal wind profile is remarkably similar to that of Uranus. Neptune has three major rings at radii of 42,000, 53,000, and 63,000 kilometers. The outer ring contains three higher density arc-like segments that were apparently responsible for most of the ground-based occultation events observed during the current decade. Like the rings of Uranus, the Neptune rings are composed of very dark material; unlike that of Uranus, the Neptune system is very dusty. Six new regular satellites were found, with dark surfaces and radii ranging from 200 to 25 kilometers. All lie inside the orbit of Triton and the inner four are located within the ring system. Triton is seen to be a differentiated body, with a radius of 1350 kilometers and a density of 2.1 grams per cubic centimeter; it exhibits clear evidence of early episodes of surface melting. A now rigid crust of what is probably water ice is overlain with a brilliant coating of nitrogen frost, slightly darkened and reddened with organic polymer material. Streaks of organic polymer suggest seasonal winds strong enough to move particles of micrometer size or larger, once they become airborne. At least two active plumes were seen, carrying dark material 8 kilometers above the surface before being transported downstream by high level winds. The plumes may be driven by solar heating and the subsequent violent vaporization of subsurface nitrogen.  相似文献   

Localization and physical property experiments conducted by Opportunity at Meridiani Planum     

Arvidson RE  Anderson RC  Bartlett P  Bell JF  Christensen PR  Chu P  Davis K  Ehlmann BL  Golombek MP  Gorevan S  Guinness EA  Haldemann AF  Herkenhoff KE  Landis G  Li R  Lindemann R  Ming DW  Myrick T  Parker T  Richter L  Seelos FP  Soderblom LA  Squyres SW  Sullivan RJ  Wilson J 《Science (New York, N.Y.)》2004,306(5702):1730-1733

The location of the Opportunity landing site was determined to better than 10-m absolute accuracy from analyses of radio tracking data. We determined Rover locations during traverses with an error as small as several centimeters using engineering telemetry and overlapping images. Topographic profiles generated from rover data show that the plains are very smooth from meter- to centimeter-length scales, consistent with analyses of orbital observations. Solar cell output decreased because of the deposition of airborne dust on the panels. The lack of dust-covered surfaces on Meridiani Planum indicates that high velocity winds must remove this material on a continuing basis. The low mechanical strength of the evaporitic rocks as determined from grinding experiments, and the abundance of coarse-grained surface particles argue for differential erosion of Meridiani Planum.  相似文献