山茱萸低产林施肥试验效果分析

连续4 a对山茱萸低产林施肥试验表明:施尿素结合喷施磷酸二氢钾、施尿素结合喷施三十烷醇和覆青草3种处理,4 a平均株产3.09kg,比施肥前增加3.63倍,比对照增加103.51％;大小年变化幅度减小;单果重、结果枝比例、单位结果枝结果数、有花枝座果率、新梢粗度和长度均有提高。     

Association of zinc with connective tissue in the digestive tract of common carp

ABSTRACT:   Zinc (Zn) concentration in the digestive tract of common carp is always >10 times higher than most animal tissues. In a previous paper, it was reported that this high Zn came from a 43 kDa Zn-binding membrane protein. In this present study it was further found that in the digestive tract of common carp, Zn content was closely associated with the amounts of extracellular macromolecules. The higher the Zn content, the more there is of collagen and glycosaminoglycans. An indirect immunoperoxidase staining method using antibody against the 43 kDa Zn-binding protein, or the fibroblast marker (Thy 1.1 protein) was applied to the sections of digestive tract of fish. It was found that the Zn-binding protein in the digestive tract of common carp is mainly located in the connective tissue of its lamina propria and submucosal layer. Connective tissue cells, probably fibroblasts, hold the 43 kDa Zn-binding protein. In the common carp Zn might be bound to the external side of the fibroblast. The present finding may have a significant meaning on extending the studies of Zn in biology to the field of Zn with extracellular matrix.     

田菁生育期间根瘤菌固氮作用和木质素积累研究

本试验研究了田菁生育期间新老根瘤更替和根瘤菌固氮作用,干物质 C/N 比和木质素累积。试验结果表明:1.田菁生育过程中有旺盛的新老根瘤的更替。主茎一真叶有效根瘤在主根上发生,主根有效根瘤教在盛花期达最大值,结荚期则减少16%,而侧根有效根瘤数则增加40.5%,从盛花期至鼓粒期单株有效根瘤数和衰亡根瘤数均增加。2.从盛花期到鼓粒期单株有效根瘤重量显著增加,虽然单位重量有效根瘤固氮酶活性降低,而单株有效根瘤固氮酶活性提高,增加固氮量。3.田菁鼓粒期较盛花期干物质量大并提高干物质 C/N 比和木质素含量,增加单株木质素积累。     

不同加工工艺对仔猪营养效应的影响

对比不同加工工艺 (膨胀制粒、普通制粒、粉料 )对 10～ 2 0kg仔猪生产性能、消化率、理化指标的影响。结果表明 :1)膨胀粒料 (EPPD)组与普通粒料 (CPPD)组、粉料 (M)组相比 ,仔猪的日增重、饲料的料重比均较高 ,但差异不显著 (P >0 .0 5 )。 2 )日粮中某些常规成分如干物质、粗脂肪、粗蛋白、粗灰分的消化率均为EPPD组最高 ,CPPD组次之 ,M组最低 ;日粮中总氨基酸的消化率以EPPD组为最高 ,CPPD组次之 ,M组最低。3)EPPD组血清中总蛋白含量、转氨酶含量和代谢产物尿素氮含量均高于CPPD组     

浅谈筏板、箱形基础的施工质量通病防治措施

本文论述了筏板基础、箱形基础工程施工中质量通病和防治措施,对工程施工有一定指导意义。     

<Emphasis Type="Italic">Ulocladium atrum</Emphasis> as a biological control agent for white mold of bean caused by<Emphasis Type="Italic">Sclerotinia sclerotiorum</Emphasis>

Field studies were conducted near Lethbridge, Alberta, Canada, in 2001, 2004 and 2005 to determine the efficacy of the antagonistic fungusUlocladium atrum for control of white mold of bean caused bySclerotinia sclerotiorum. Results of the 3 years of field trials showed that, compared with the untreated control, foliar application of a spore suspension ofU. atrum (300 ml m⁻² of 10⁶ spores ml⁻¹ suspension) significantly reduced incidence and severity of white mold, increased seed yield and reduced contamination of bean seed by sclerotia ofS. sclerotiorum. The level of control of white mold observed in the treatment ofU. atrum was similar to that of the mycoparasitic fungusConiothyrium minitans, but lower than the fungicide treatments of Ronilan (vinclozolin) at the rate of 1200 g ha⁻¹ per application in 2001, or Lance (boscalid) at the rate of 750 g ha⁻¹ per application in 2004 and 2005. The potential for use ofU. atrum as a biological control agent for sclerotinia diseases is discussed. http://www.phytoparasitica.org posting Nov. 12, 2006.     

草鱼、鳊对南方几种牧草的适口性评价研究

研究了草鱼、鳊对南方山区主要高产优质牧草的最大摄食率及适口性,试验表明:冷季牧草品种中,草鱼对营养期黑麦草、鸡脚草的摄食率分别是74.03%、70.09%,显著高于紫花苜蓿,说明营养期黑麦草、鸡脚草的适口性明显好于紫花苜蓿.草鱼对暖季牧草甘薯叶、杂交狼尾草的摄食率最高,分别是61.98%、56.15%,与狗尾草33.76%差异显著,其他多数品种介于这二者之间.鳊对百喜草、杂交狼尾草和印度豇豆的摄食率最高,分别是61.13%、59.97%、61.68%,显著高于其他品种.试验期间草鱼、鳊都拒食串叶松香草.木质素、单宁物质等抗营养物质是影响草食性鱼类适口性的重要因素.鳊的适口性与草鱼有所区别,对于细茎或藤蔓较有韧性的牧草的摄食能力不如草鱼.     

糖萜素对鲫鱼消化酶活性的影响

本试验测定了饲养30d鲫鱼的肠道和肝胰脏中蛋白酶、淀粉酶和脂肪酶的活性。结果表明,在基础饲料中添加1000mg/kg糖萜素能显著提高鲫鱼肠道和肝胰脏中的蛋白酶、淀粉酶和脂肪酶活性(P<0.05),且效果优于基础饲料中添加4mg/kg的黄霉素组。     

蚯蚓粪营养组成及其对异育银鲫增重率的影响

本试验将120尾异育银鲫随机分成2组:对照组投喂基础日粮,试验组在基础日粮中添加5%蚯蚓粪。连续投喂60d后,测定蚯蚓粪营养成分、氨基酸含量及鱼体增重率。结果表明,蚯蚓粪中含水分22.6%、粗蛋白质12.44%、粗脂肪0.86%、灰分35.88%、碳水化合物27.74%、总氨基酸6.06%、必需氨基酸为2.48%(占总氨基酸的39.81%),其中可提高适口性的天门冬氨酸、谷氨酸、丙氨酸及甘氨酸等含量也相对较多。生长试验表明:与对照组相比,饲喂5%蚯蚓粪异育银鲫增重率比对照组显著提高29.75%(P<0.05)、饵料系数显著降低23.77%(P<0.05),并降低了死亡率。     

冬小麦晚播高产试验及其技术体系的理论探讨——兼论小麦高产途径

以小麦产量形成规律为中心,比较了精播、常规、独秆*~3种高产途径的异同;分析了各途径的小麦生育和产量形成规律的特点及其相应配套措施。认为,独秆途径表现生物学产量较低,无效消耗较少,经济系数较高的优点,是一种具有一些高光效特点的高产栽培技术体系。但也具有抗逆性较差,栽培技术较难掌握,高产稳定性差,高产频率较低等缺点。故应慎重考虑其扩展面积。