摘要:

Studies of mobility in horizontal tubes containing different soil fractions at different suctions and in single layers of particles, showed that the optimum particle size for movement ofHeterodera schachtiiandDitylenchus dipsaciwas 150–250 and 250–500 μ, respectively. In both species mobility was greatest when (a) there were few pores smaller in diameter than the eelworm width, (b) the pore diameter was narrow enough to restrict lateral movement, (c) the tortuosity of the channels between particles was such that the body form of the eelworm had waves of long wave‐length and short amplitude. By plotting tracks among water droplets it was possible to show quantitatively the relationship between the form of the body waves and the speed of the eelworms. The optimum temperature for movement was 15°C. forH. schachtiiand 15–20°C. forD. dipsaci.The comparative study suggested that there was a simple relationship between body length, particle size

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02180.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

The hatching factor from potato root diffusate has many of the properties of eclepic acid from tomato root andSolanum nigrum(Russell, Todd&Waring, 1949), as well as the same biological activity. No comparison of the specific activity of the two products is possible because of differences in the assay techniques, but the best preparations of both showed maximal hatching activity at about 0.1 mg./1. It is found that the potato preparations, which are freely soluble in water, are simultaneously inactivated and rendered insoluble by brief exposure to caustic alkali. The product of alkali treatment has been crystallized.

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02181.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02182.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02183.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02184.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02185.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02186.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02187.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02188.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY

摘要:

Book reviewed in this article:Comparative physiology of the nervous control of muscular contraction.By GrahamHoyle, D.ScParthenogenesis and Polyploidy in Mammalian Development.By R. A. Beatty(Cambridge Monographs in Experimental Biology)Introduction to Bacterial Physiology.By C. E. Clifton.The Origin of Life on the Earth.By A. I. Oparin.Third revised and enlarged edition. Translated from the Russian by AnnSynge.Principles of Immunology.By JohnE. Cushingand DanH. Campbell.>Common Diseases of Vegetables in South Africa.By VincentA. Wager.Proceedings of the Third British Weed Control Conference, 1956The Biological Action of Growth Substances. Symposia of the Society for Experimental BiologyThe U.C. System for Producing Healthy Container‐Grown Plants.Edited by K. F. Baker.Control of the Plant Environment.Proceedings of the University of Nottingham Fourth Easter School in Agricultural Science. 1957. Ed. J. P. Hudson.Magnesium, the Fifth Major Plant Nutrient.By A. Jacob.Translated by Dr Norman Walk

ISSN:0003-4746    

DOI:10.1111/j.1744-7348.1958.tb02189.x

出版商:Blackwell Publishing Ltd    

年代:1958

数据来源: WILEY