品质不同的稻米胚乳细胞形态特征的扫描电镜观察   总被引：5，自引：0，他引：5  

瞿波  徐运启 《华中农业大学学报》1991,10(4):404-408,T002

  相似文献   

油菜素内酯促进小麦灌浆结实及其生理基础的研究   总被引：5，自引：1，他引：5  

王学奎  骆炳山 《华中农业大学学报》1990,9(2):123-128

  相似文献   

Effects of Thyroxin and Domperidone on Oocyte Maturation and Spawning Performances in the Rabbit Fish,Siganus guttatus          下载免费PDF全文

Hung Q. Pham  Hoang M. Le 《Journal of the World Aquaculture Society》2016,47(5):691-700

Thyroxin (T₄) is proven to have various functions in fish reproduction. In this study, we investigated oocyte maturation and spawning performance in the rabbit fish, Siganus guttatus, orally exposed to different doses of T₄ (0.05, 0.25, and 0.5 mg/kg fish) during vitellogenesis. No statistically significant differences of reproductive characteristics were observed among the treatments. However, the group that was exposed to the dose of 0.5 mg/kg spawned after receiving a hormone injection. The findings suggest that feeding T₄ during vitellogenesis did not advance oocyte maturation, but probably could induce spawning in rabbit fish. In a separate experiment, we investigated the effects of orally administered domperidone (DOM) on reproductive performances of the female rabbit fish. The study showed that oral administration of DOM during the early stages of the reproductive cycle had no significant effects on oocyte maturation and spawning performance. Overall, these findings suggest that DOM may not be needed for the induction of maturation and spawning of this species under aquaculture conditions. These practical investigations were conducted with a view to attempt reducing drug use, production costs, and support sustainable aquaculture.  相似文献   

卧螺离心机在餐饮行业废水处理中的工艺研究     

屈年凯  卢彦俊 《绿色大世界》2012,(3):274-275

指出了餐饮行业产生的废水（泔水）可以作为一种资源被回收利用,探讨了通过工艺上的改进,采用卧螺离心机对泔水进行规模化分离处理,达到高效分离的目的,从而使泔水得到＂资源化＂的分类处理。  相似文献   

Factors influencing the survivorship of the burrowing nematode,Radopholus similis (Cobb.) Thorne in two types of soil from banana plantations in Martinique     

Christian Chabrier  Philippe Tixier  Pierre-François Duyck  Céline Carles  Patrick Quénéhervé 《Applied soil ecology》2010,44(2):116-123

The burrowing nematode, Radopholus similis (Cobb.) Thorne, causes the most damage to bananas. To minimize nematicide applications, cropping systems that use fallow, crop rotation and clean planting material have been developed in the French West Indies. In order to optimize the benefit of the intercropping period, we studied the survivorship of R. similis in different soil types and conditions. We monitored the survivorship of calibrated populations of R. similis in the laboratory on a Nitisol and on an Andosol, two soils derived from volcanic ashes and pumices. We studied water potentials ranging from 0 to ?700 kPa on undisturbed soil and on soil previously frozen to get rid of living nematodes. Mortality of adult R. similis decreased regularly, and was fairly well described by Teissier's model. In the previously frozen soils, R. similis survived longer in wet soils (half-life of 21–46 days at 0 to ?5 kPa) than in dry soils (half-life of less than 10 days between ?80 and ?250 kPa). In contrast, in undisturbed soils, R. similis survived longer in dry soils: half-lives ranged from 57 days at ?273 kPa to 17 days at water saturation in the Andosol, and 36 days at ?660 kPa to 14 days at water saturation in the Nitisol. These results are consistent with the absence of anhydrobiosis in R. similis, unlike Pratylenchus coffeae. P. coffeae survivorship curves over time do not follow a model derived from exponential decrease like Teissier's model. These results also show that the recommended one year host-free period required to sanitize soils cannot be shortened without risk, even if flooding the soil could improve it.  相似文献   

Iron and zinc accumulation in winter wheat regulated by NICOTIANAMINE SYNTHASE responded to increasing nitrogen levels     

Rong-Rong Zhao  Bao-Yuan Qu 《Journal of plant nutrition》2013,36(14):1624-1636

Nitrogen (N) is critical for micronutrient biofortification in wheat grain and is essential for a series of nitrogenous compounds biosynthesis. This study aims to assess the role of improved N supply in iron (Fe) and zinc (Zn) enrichment and expression of genes related to Zn and Fe chelation and transport in winter wheat. Potting and hydroponic culture experiments were conducted to study the effect of increasing N application on Zn and Fe uptake and translocation from roots to leaves and the temporal and spatial gene expression profiles of the NICOTIANAMINE SYNTHASE (NAS) genes in wheat. Plants were grown with low, medium and high N supply levels. The results showed that higher N application increased Fe and Zn content in leaves, and decreased Fe and Zn content in root compared with the lower N supply. High N application also increased the distribution of Fe and Zn from roots to leaves. Expression analysis showed that increased N application resulted in up-regulation of two wheat NAS genes, TaNAS1 and TaNAS2. Highly positive response between NAS genes and increasing N application indicated that abundance nicotianamine (NA) resulted from highly expressed NAS genes might involve in the chelation of Fe and Zn in the phloem and favor Fe and Zn uptake and accumulation in wheat leaves.  相似文献   

不同酶制剂对水稻秸秆和白酒糟混合青贮品质的影响   总被引：1，自引：0，他引：1  

寇江涛  程钰  张海波  郭冬生  雷佳星  孟佳琪  刘鑫  李乐 《草地学报》2021,29(2):396-401

为研究不同酶制剂对水稻（Oryza sativa L.）秸秆和白酒糟（m︰m=1︰1）混合青贮品质的影响，设置CK（对照）、CEL（250 U·g^-1纤维素酶）和XYL（250 U·g^-1木聚糖酶）3个处理，青贮120 d后取样测定其青贮品质。结果表明：CEL处理的感官评定等级为良好；CEL和XYL处理的干物质、粗脂肪、钾和镁含量均显著高于CK（P<0.05），且CEL处理的粗蛋白和磷含量显著高于CK（P<0.05）；CEL和XYL处理的中性洗涤纤维、酸性洗涤纤维、木质素和纤维素含量均显著低于CK（P<0.05），且CEL处理显著低于XYL处理（P<0.05）；CEL和XYL处理30 h的养分消化率显著高于CK（P<0.05），且CEL处理48 h的养分消化率均显著高于CK（P<0.05）；CEL和XYL处理的饲用价值显著高于CK（P<0.05），且CEL处理显著高于XYL处理（P<0.05）。综上所述，添加纤维素酶、木聚糖酶能够提高水稻秸秆和白酒糟混合青贮的营养品质、养分消化率和饲用价值，且纤维素酶的添加效果优于木聚糖酶。  相似文献   

辽宁省大连市深松整地机械技术规范     

曲长里 《北京农业》2012,(12):243

介绍辽宁大连地区的几种深松机具的使用特点,操作要点以及使用注意事项。  相似文献   

朴实无华写丰碑——专访山东鲁西兽药股份有限公司总经理刘长德     

曲哲夫 《饲料广角》2010,(18):47-49

作为一本专业的饲料杂志刊登一篇采访兽药企业掌门人的文章,编辑本是有一些小小的迟疑的,但是换一个角度想,既然是采访企业领导者,不管他经营的是什么,企业运营、市场开拓等方面总有相通之处,况且兽药行业与饲料业也同属农牧业产业链条上的一环,这么算来,我们的采访应该也说得上顺理成章了,所以我们采录了这篇文章,以飨读者。  相似文献   

Study on the Stability of Blue-tongue Virus after Long Time Storage in Cold Room     

MIAO Hai-sheng  LI Le  ZHU Jian-bo  XIAO Lei  LI Hua-chun 《中国畜牧兽医》2013,40(6):41-44

In order to understand the stability of blue-tongue virus (BTV)storage in cold room for long time, 18 tissue samples which were kept in 4℃ for 10 to 15 years were test by Real-time PCR, and 10 blood samples which were kept in 4℃ for 15 years were subjected to virus isolation process, then was proved by monoclonal antibody staining,research results showed all old samples were positive in Real-time PCR, further more, 5 live virus were isolated from 10 old blood samples. The results suggested the stability of BTV was higher than we thought before.  相似文献