591 Permeabilität 315 



Polystictus versicolor, Pleurotus sapidus, and Trametes Peckii grow best in the 



order named. Otliers grow well only on certain media, e. g., Lenzües vialis, 

 Daedalea quercina, and Merulius lacrymans on Richard* s Solution. 

 3. C z a p e k ' s Solution with the monobasic, and Richard's Solution with 

 the mono-, di-, and tribasic potassium phosphate proved generally to be suitable 

 media. Thus, there is a decided indieation of the desirability of selecting a 

 specific medium for each fungus. 4. In the Solutions studied the H ion con- 

 tent ration does not seem to be the limiting factor in growth, nor in general does 

 it appear to be the factor (within the limits studied) which determines a 

 desirable medium. 5. The shifting of the H ion concentration due to metabolism 

 depends both upon the fungus and the medium. G. Xo general statement can 

 be made concerning the relation between the H ion-concentrations of the cul- 

 ture media and the growth of wood-destroying fungi as a group." — Siehe 

 auch Nr. 136, 152, 155, 161, 189, 200, 202, 219, 244, 245, 250, 251, 582. 



b) Permeabilität 



(Siehe auch Nr. 389!) 



393. Brenner, Widar. Studien über die Empfindlichkei t 



n n d Permeabilität pflanzlicher Protoplasten für Säuren 

 und Basen. (Öfv. Finsk. Vetensk. Soc. Förh., Helsingfors, LX, 1918, 124 pp.) 

 — Es ist die Schädlichkeitsgrenze vieler anorganischer und organischer Säuren 

 sowie einiger Basen gegenüber Protoplasten aus verschiedenen Pflanzen zellen 

 ermittelt worden. Die geprüften Säuren konnten in der Regel nicht in die 

 Zelle hineindringen, solange das Plasma einigermaßen unbeschädigt war. Von 

 den Basen permeierte NBUOH, nicht aber KOH. Die Permeabilitätsverhältnisse 

 der Säuren und Basen stimmen mit der Overtonischen Lipoidtheorie gut über- 

 ein. — Die Säuren und Basen rufen in gewissen, niederen Konzentrationen eine 

 Volumenvergrößerung des Plasmas auf Kosten der Vakuole hervor. Die Er- 

 scheinung ist meist nekrobiontisch, mit Ammoniak aber vital. 



Autorrefer a t. 



394. Brooks, S. C. Permeability o f the c e 1 1 w a 11 o f 

 Allium. (Bot. Gaz. 64, 1917, p. 509—512.) — Summary: „1. The exterior cell 

 wall of the epidermis from the inner surface of onion bulb scales is slightly 

 permeable to hydrochloric acid, while it is practically impermeable to various 

 salts, dyes, and to sodium hydroxide. 2. It is necessary to consider the in- 

 fluence of impermeable cell walls in interpreting experiments on the permeability 

 of plant tissues." — Vgl. Besprechung durch Ruhland in Ztschr. f. Bot. 13, 

 1921, p. 325—326. 



395. Denny, F„ E. Permeability o f certain plant membra- 

 nestowater. (Bot. Gaz. 63, 1917, p. 373—397, 2 Fig.) 



396. Denny, F. E. Permeability o f membranes a s related 

 t o t h e i r c o in p o s i t i o n. (Bot. Gaz. 63, 1917, p. 468—485, mit 6 Fig.) — 

 Summary: „1. The röle of diff'erent substances in seed coats in regulating their 

 permeability to water was studied. 2. Membranes w r ere extracted with water, 

 alcohol, acetone, ether, and calcium cMoride, and their permeability measured 

 before and after such treatments. 3. Cross-sections of the seed coats were 

 made and tested microchemically to determine the nature of the substances 

 present, and the effect upon them of the diff'erent methods of treatment 

 employed in the experiment. A chemical analysis of the seed coat of the 

 peanut and of the extracted materials was made to determine the content of 



