the one-sided study of carboncompounds cannot suffice to elucidatethe nature of chemical processes in allaspectsthe reversion of organic chemistryto the great problems of biology
the reversion of organic chemistry to the great problems of biology. the one-sided study of carbon compounds cannot suffice to elucidate the nature of chemical processes in all aspects
coHNCHcocNHHCNH川COCHNHHNCNNUric acidPurine"inrecognitionHNcoHN-coofthecoNHNH,.CNHC-CHCHN-HN-CCextraordinaryXanthineGuanineserviceshe hasHNcoNC-NH,HCHCCNHUnNH1之CHCHrendered byhisNCNNHypoxanthineAdeninework on sugarCOCOCH,-NCH,-NCH,cocoNNHCCandpurineat1CHCHCH,-NCH,N-NNCaffeineTheophyllinesynthesesHNCONC-CICHcoCI-CCNHC--C.CICHNCH,-NNTrichloropurineThcobromine
“in recognition of the extraordinary services he has rendered by his work on sugar and purine syntheses
+Before Fischer:Research started at the beginning oforganic chemistrythe first organic products formed in plantsfrom carbon dioxide in the airAbundance:surpass all substance that arecurrent in the living world.more than a century elapsed from theelucidation of their elementary compositionby LavoisierCarbohydrateSlowprogress
+ Before Fischer: Research started at the beginning of organic chemistry the first organic products formed in plants from carbon dioxide in the air Abundance: surpass all substance that are current in the living world. more than a century elapsed from the elucidation of their elementary composition by Lavoisier Slow progress
ThereasonThepeculiardifficultieswhenthosesubstancesposeforexperimentaltreatmentThe greatprofusion of forms whichalso necessitates a rather complexsystematology
+ The reason The peculiar difficulties when those substances pose for experimental treatment The great profusion of forms which also necessitates a rather complex systematology
+ Known distinctionPolysaccharideMonosaccharideGrape sugarStarch,CelluloseByhydrolysis allpolysaccharides can beBoth hydrolyse toformconverted intothegrape sugarsimplermonosaccharidesWithstarch,hydrolysiscomes aboutundertheConverselyaction of the gastric andmonosaccharides can betransformed into theintestinal juices.more complexpolymersCellulosehydrolysed byby a process termeddehydratationstrong sulphuric acidand yields wood sugar50known,10innature
+Known distinction Grape sugar Starch, Cellulose Both hydrolyse to form grape sugar With starch, hydrolysis comes about under the action of the gastric and intestinal juices. Cellulose hydrolysed by strong sulphuric acid and yields wood sugar Monosaccharide Polysaccharide By hydrolysis all polysaccharides can be converted into the simpler monosaccharides Conversely monosaccharides can be transformed into the more complex polymers by a process termed dehydratation 50 known, 10 in nature