棉苗黑斑病的发生条件及其防治途径     

李君彦  仇元 《植物保护学报》1963,2(2):195-204

棉苗黑斑病的致病菌在关中棉区初步认为是 Alternaria tenuis Nees 与棉成株期叶片上的致病菌不同。病菌孢子借气流传布。种子带菌率虽然很高,但诱发苗病率却很低,因此,种子消毒或采用轮栽来控制这个病害,是不能达到预期效果的。病害发生与棉苗受冻、强风对棉苗的伤害以及棉苗阶段发育有密切的关系。各年发病期有早有晚,但以真叶出现时为易感阶段。本文阐述了棉苗生育阶段、气候条件与发病的关系,为预测病害发生的物候与气象参考条件提供了资料。棉株伤害与发病有关系,建议在生产上适当降低播种量,提高播种质量,适期早疏苗、早间苗;以减轻由于伤损而导致病害侵染。品种与病害发生的关系不显著。试验证明,使用波尔多液加1059于降温前喷射效果较好。  相似文献   

大白菜窖藏中一些腐烂细菌的研究     

裘维蕃  狄原渤  周毓瑶  司凤举 《植物病理学报》1964,7(2):127-134

 窖藏白菜腐烂是由许多细菌造成的。最重要的是Erwinia aroideae和E.phytophthora以及被认为是腐生菌的三种芽孢杆菌Bacillus pumilus,B.poly-myxa和B.subtilis。试验证明在一定条件下后者能引致明显的腐烂。  相似文献   

Effect of temperature and diet on wound healing in Atlantic salmon (Salmo salar L.)     

Linda B. Jensen  Thomas Wahli  Charles McGurk  Tommy Berger Eriksen  Alex Obach  Rune Waagbø  Ana Handler  Carolina Tafalla 《Fish physiology and biochemistry》2015,41(6):1527-1543

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Human endothelial cell growth factor: cloning, nucleotide sequence, and chromosome localization   总被引：78，自引：0，他引：78  

M Jaye  R Howk  W Burgess  G A Ricca  I M Chiu  M W Ravera  S J O'Brien  W S Modi  T Maciag  W N Drohan 《Science (New York, N.Y.)》1986,233(4763):541-545

Several of the endothelial cell polypeptide mitogens that have been described probably play a role in blood vessel homeostasis. Two overlapping complementary DNA clones encoding human endothelial cell growth factor (ECGF) were isolated from a human brain stem complementary DNA library. Southern blot analysis suggested that there is a single copy of the ECGF gene and that it maps to human chromosome 5 at bands 5q31.3 to 33.2 A 4.8-kilobase messenger RNA was present in human brain stem messenger RNA. The complete amino acid sequence of human ECGF was deduced from the nucleic acid sequence of these clones; it encompasses all the well-characterized acidic endothelial cell polypeptide mitogens described by several laboratories. The ECGF-encoding open reading frame is flanked by translation stop codons and provides no signal peptide or internal hydrophobic domain for the secretion of ECGF. This property is shared by human interleukin-1, which is approximately 30 percent homologous to ECGF.  相似文献   

Human sperm binding is mediated by the sialyl-Lewis(x) oligosaccharide on the zona pellucida     

Pang PC  Chiu PC  Lee CL  Chang LY  Panico M  Morris HR  Haslam SM  Khoo KH  Clark GF  Yeung WS  Dell A 《Science (New York, N.Y.)》2011,333(6050):1761-1764

Human fertilization begins when spermatozoa bind to the extracellular matrix coating of the oocyte, known as the zona pellucida (ZP). One spermatozoan then penetrates this matrix and fuses with the egg cell, generating a zygote. Although carbohydrate sequences on the ZP have been implicated in sperm binding, the nature of the ligand was unknown. Here, ultrasensitive mass spectrometric analyses revealed that the sialyl-Lewis(x) sequence [NeuAcα2-3Galβ1-4(Fucα1-3)GlcNAc], a well-known selectin ligand, is the most abundant terminal sequence on the N- and O-glycans of human ZP. Sperm-ZP binding was largely inhibited by glycoconjugates terminated with sialyl-Lewis(x) sequences or by antibodies directed against this sequence. Thus, the sialyl-Lewis(x) sequence represents the major carbohydrate ligand for human sperm-egg binding.  相似文献   

Interleukin-1 costimulatory activity on the interleukin-2 promoter via AP-1   总被引：37，自引：0，他引：37  

K Muegge  T M Williams  J Kant  M Karin  R Chiu  A Schmidt  U Siebenlist  H A Young  S K Durum 《Science (New York, N.Y.)》1989,246(4927):249-251

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Neuroleptic drug-induced dopamine receptor supersensitivity: antagonism by L-prolyl-L-leucyl-glycinamide   总被引：1，自引：0，他引：1  

S Chiu  C S Paulose  R K Mishra 《Science (New York, N.Y.)》1981,214(4526):1261-1262

An animal model of tardive dyskinesia was used to evaluate the potential antidyskinetic properties of the neuropeptide L-prolyl-L-leucyl-glycinamide (PLG). In rats, PLG administered concurrently with the neuroleptic drug haloperidol or chlorpromazine antagonized the enhancement of specific [3H]spiroperidol binding in the striatum that is associated with long-term neuroleptic treatment. The results are discussed in relation to a possible functional coupling of the putative PLG receptor with neuroleptic-dopamine receptor complex and clinical implications for tardive dyskinesia.  相似文献   

The genome of the basidiomycetous yeast and human pathogen Cryptococcus neoformans     

Loftus BJ  Fung E  Roncaglia P  Rowley D  Amedeo P  Bruno D  Vamathevan J  Miranda M  Anderson IJ  Fraser JA  Allen JE  Bosdet IE  Brent MR  Chiu R  Doering TL  Donlin MJ  D'Souza CA  Fox DS  Grinberg V  Fu J  Fukushima M  Haas BJ  Huang JC  Janbon G  Jones SJ  Koo HL  Krzywinski MI  Kwon-Chung JK  Lengeler KB  Maiti R  Marra MA  Marra RE  Mathewson CA  Mitchell TG  Pertea M  Riggs FR  Salzberg SL  Schein JE  Shvartsbeyn A  Shin H  Shumway M  Specht CA  Suh BB  Tenney A  Utterback TR  Wickes BL  Wortman JR  Wye NH  Kronstad JW  Lodge JK 《Science (New York, N.Y.)》2005,307(5713):1321-1324

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精油防治仓库害虫的实仓应用   总被引：5，自引：0，他引：5  

徐汉虹  江福银 《华南农业大学学报》1993,14(3):42-47

采用4种精油对4种仓库害虫进行了模拟实仓防治试验.结果发现,0.2％(W/W)肉桂油拌种对小麦的保护效果可维持8个月以上.以0.45mg/cm~2的剂量处理麻袋,齿叶黄皮和八角茴香精油处理能保持小麦4个月无虫,肉桂油可保持8个月无虫.实仓试验中发现,15ppm马拉硫磷加15ppm肉桂油混用处理.虫口减退率达100％.30ppm马拉硫磷和30ppm肉桂油处理的虫口减退率分别为89.8％和98.5％.  相似文献   

Aquatic Hazard Assessment of a Contaminated Surficial Aquifer Discharge into the Bush River,Maryland (U.S.A.)     

Burton  Dennis T.  DiLorenzo  Joseph L.  Shedd  Tommy R.  Wrobel  John G. 《Water, air, and soil pollution》2002,139(1-4):159-182

An aquatic hazard assessment of contaminatedgroundwater in a surficial aquifer was conducted at Beach Pointwhich is located in the Edgewood Area of the U.S. Army Garrison,Aberdeen Proving Ground, Maryland. Toxicity was detected atvarious groundwater concentrations by seven of 10 toxicity testsystems exposed to a mixture of heavy metals and chlorinatedaliphatic hydrocarbons. When estimated maximum acceptabletoxicant concentrations (MATC) were established, the data foralgae, invertebrates, and fish suggested that the groundwaterwould not be harmful at a concentration of 10% groundwater byvolume. Likewise, no genotoxicity (Ames and SEC assays),development toxicity (FETAX), or chronic histopathology (9-monthfish test) occurred at 10% groundwater by volume.Near-field (ULINE model) and far-field (dye-tracer model)screening level dilution models were run to estimate the dilutionof the groundwater discharge plume from Beach Point into the BushRiver. The groundwater was considered to be a potentiallyexcessive hazardous material to the biota in the Bush River whena number of conservative assumptions regarding contaminantdistribution and discharge rate of the aquifer were used in thehazard assessment. By modeling the groundwater emanating fromBeach Point as the dilution of a discharge from a line diffuser,the potential water quality impacts were judged to be minimal ifState of Maryland surface water discharge criteria for a mixingzone were used for the discharge of groundwater to the Bush River.  相似文献