The influence of stimulating doses of 6-benzylaminopurine on awakening apple buds and on their consumption of oxygen

Byl sledován vliv 6-benzylaminopurinu na dýchání pupen? jabloně odr?dy Boskooaké v pr?běhu 5 dn? po pod7#x00E1;ní kininu. Bylo zji?těno, ?e spot?eba kyslíku stanovovaná p?ímou metodou Warburgovou je vy??í ji? prvního dne po podání 6-benzylaminopurmu a stoupá stále výrazněji a? do pátého dne, kdy je spot?eba kyslíku u pupen? stimulovaných o 75% vy??í, ne? u pupen? kontrolních.     

Enzymes of the jejunal enterochromaffine cells in man

Summary A study of enzymatic equipment of enterochromaffine cells (e.c.) in jenual biopsies obtained with a Crosby capsule in normal humans and patients with nontropical sprue was undertaken. The following enzymes were demonstrated: alkaline phosphatase and adenosine triphosphatase (cell membrane), acid phosphatase (corpuscular), non-specific esterase (diffuse and corpuscular, predominantly eserine resistant, in corpuscular localization E 600 resistant), DPN- and TPN-diaphorases and dehydrogenases of lactic acid, malic acid, isocitric acid, glucoso-6-phosphoric acid, succinic acid, -hydroxybutyric acid and -glycerophosphoric acid. Enzyme activities were not equal in all cells suggesting some type of secretory cycle. In most patients with untreated nontropical sprue or with the disease in relapse e.c. were more numerous and hypertrophic with elevated activities of non-specific esterase and acid phosphatase. Implications of these results are briefly discussed.With 8 Figures in the Text, of which 2 in Colour     

Ein Beitrag zur Kenntnis des Selektivitätsmechanismus von Pyrazon

Ve snaze identifikovat fyziologické pochody rozhodující o selektivní toxicitě pyrazonu (1-fenyl-4-amino-5-chorpyridazon-6) jsme sledovali jeho vliv na hlavní enzymové systémy ?ídící dýchání ko?en?. Zatímco jsme u ko?en? zeSinapis alba zjistili úplnou inaktivaci dehydrogenázy kyseliny jantarové—u ko?en? cukrovky je stejný enzym stimulován.     

Changes in the anatomical structure of the shoot apex ofSenecio vulgaris L. during ontogenis in relation to the formation of leaves and inflorescence

An investigation was made of the anatomical structure of the shoot apex ofSenecio vulgaris L. a photoperiodically neutral plant, and compared with the formation of successive leaf primordia along the axis up to the initiation of the terminal inflorescence. In the shoot apex of a germinating plant a central zone can first be distinguished from the peripheral zone which is composed of small and intensely stained cells. Later, a rib meristem appears. At the time of the initiation of the middle (the largest) leaves, the shoot apex has a distinct small central zone and a well developed peripheral zone and rib meristem. Between these zones there is a group of cells dividing in all directions, the subcentral zone. At the time of initiation of the last leaves, the central zone extends to the flanks and gradually ceases to be distinguishable. At the same time, the subcentral zone increases in size. This is caused first by cell division and later, with the initiation of the last, most reduced leaves, by enlargement of the cells. Vacuolization in the inner part of the apex and the arrangement of the superficial cells in rows parallel to the surface of the apex, is a preparatory step to the initiation of the inflorescence.     

Bemerkungen zur Variabilität vonSaxifraga marginata

Saxifraga marginata Sternb. is divided into three subspecies:S. m. subsp.marginata, S. m. subsp.bubakii (Rohlena)Chrtek etSoják,S. m. subsp.karadzicensis (Degen etKo?anin)Chrtek etSoják (environments of Skopje, Macedonia).     

甘蔗幼叶切段培养中的体细胞胚胎发生

本文从形态学和组织学方面研究了甘蔗幼叶胚性愈伤组织发生及体细胞胚胎的形成过程。甘蔗幼叶片切段培养于含2.4—D1.5mg/1的MS培养基上,4—6天后切段开始形成愈伤组织,约10天后愈伤组织表面出现白色颗粒状结构。将含有白色颗粒状结构的愈伤组织转移至不含激素的培养基中,7—10天后可见有小植株长出。组织学和形态学观察表明,甘蔗离体再生植株是通过体细胞胚胎发生途径。