Studies on 4-keto-L-proline     

MITOMA C  SMITH TE  DACOSTA FM  UDENFRIEND S  PATCHETT AA  WITKOP B 《Science (New York, N.Y.)》1959,129(3341):95-96

The administration of ketoproline to chick embryos resulted in an increase in the free hydroxyproline. This phenomenon is explained by the inhibitory action of ketoproline on the catabolism of hydroxyproline as well as by the conversion of the former to the latter. Ketoproline was found to be reduced to hydroxyproline by the supernatant fraction of rat-kidney homogenate in the presence of a reduced pyridine nucleotide.  相似文献   

Cropping leads to loss of soil organic matter: How can we prevent it?     

Vincent CHAPLOT  Pete SMITH 《土壤圈》2023,33(1):8-10

<正>Soil organic matter (SOM), which associates carbon (C) to key plant nutrients, has been stored in soil for thousands of years. Scientists have long recognised its positive impact on key environmental functions such as food production and climate regulation. As soon as a virgin land (forest or grassland) is cultivated, there is a tendency for the soil to lose its SOM, and we still largely misunderstand the underlying mechanisms, leading to inappropriate decisions being taken to fight soi...  相似文献   

Evidence for the competitive exclusion of Aeromonas salmonicida from fish with stress-inducible furunculosis by a fluorescent pseudomonad   总被引：4，自引：0，他引：4  

P. SMITH  S. DAVEY 《Journal of fish diseases》1993,16(5):521-524

  相似文献   

The bacterial flora of rainbow trout, Salmo gairdneri Richardson, and brown trout, Salmo trutta L., eggs and its relationship to developmental success   总被引：1，自引：0，他引：1  

G. A. BARKER  S. N. SMITH  N. R. BROMAGE 《Journal of fish diseases》1989,12(4):281-293

Abstract. The bacterial flora of rainbow, Salmo gairdneri Richardson, and brown trout, Salmo trutta L., eggs was studied during incubation. Few bacteria were considered to exist internally, although Pseudomonas species and Aeromonas hydrophila were isolated. During incubation, large numbers of bacteria approaching 500 colony forming units/mm² accumulated around egg surfaces. Both rainbow and brown trout eggs placed in a through-flow system were colonized mainly by Pseudomonas sp. and A. hydrophila , whilst rainbow trout eggs in a separate recycling system were dominated by a Cytophaga species. Glass beads were also incubated (as an inert surface) and found to support significantly lower numbers of bacteria. Egg mortalities were recorded daily and found to differ significantly between both fish species and water conditions. Statistical analysis indicated a potentially significant correlation between hatching success and numbers of surface bacteria.  相似文献