解剖学和形态学
麻醉学
听力与言语-语言病理学
行为科学
心脏和心血管系统
细胞和组织工程学
临床神经病学
危重症监护医学
牙科,口腔外科和医学
皮肤病学
急诊医学
内分泌学和新陈代谢
肠胃学和肝脏学
老人病学和老年医学
卫生保健科学和服务
血液学
免疫学
传染病
综合和补充性医学
医学伦理学
医学信息学
医学实验室技术
医学,全科和内科
医学,法律
医学,研究和试验
神经系统科学
护理
营养学和饮食学
产科医学和妇科医学
肿瘤学
眼科学
整形外科学
耳鼻喉科学
病理学
儿科学
周围血管疾病
药理学和药剂学
生理学
基本医疗保健
精神病学
公共、环境和职业卫生
放射学,核医学和医学成像
康复学
生殖生物学
呼吸系统
风湿病学
运动科学
外科学
毒理学
热带医学
泌尿学和肾脏学
病毒学
老年医学
健康政策和服务
心理学,临床
abstract::14C-IAA was applied to decapitated Coleus 5th internodes. Sections were radioautographed at various intervals after the application. The location of the label within cells and tissues is discussed. No accumulation of label occurred in the region where xylem cells regenerated. Label was particularly associated with xyl...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386501
更新日期:1972-03-01 00:00:00
abstract::Living tissues of diverse plants representing 17 families were infiltrated with indole-3-acetaldoxime (IAAld oxime) in phosphate buffer, pH 6, and incubated for 3 hours at 25°C. Indole compounds were then extracted, separated and identified by paper or thin-layer chromatography (TLC). Indole-3-acetic acid (IAA) was qu...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394605
更新日期:1972-03-01 00:00:00
abstract::The lateral bud of Solanum andigena has the potentiality to develop as a stolon or as a leafy, orthotropic shoot. Natural stolons are normally only produced from underground nodes, but aerial stolons can be induced to form by the application of a combination of indole-3-acetic acid and gibberellic acid (IAA/GA3) paste...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385161
更新日期:1972-03-01 00:00:00
abstract::Heterocysts of Anabaena cylindrica, isolated rapidly in the cold, were found-in contrast to earlier reports-to contain all of the same lipids and lipophilic pigments, and in about the same proportions, as vegetative cells. In broken filaments and in heterocysts damaged during isolation, the membrane lipids and certain...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00398015
更新日期:1972-03-01 00:00:00
abstract::Dormancy in intact seeds of Ruellia humilis is broken by chilling or by treatment with gibberellic acid (GA3). Embryos are nondormant and will grow when the seed coat is removed completely. Embryos from chilled or GA3-treated seeds have more growth potential than embryos from nontreated seeds. Dormancy is ascribed to ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385202
更新日期:1971-12-01 00:00:00
abstract::The purified protein which constitutes the membranes of the gas vacuoles of the the blue-green alga, Microcystis aeruginosa, was partially characterized. Gel electrophoresis and end-group analysis indicate that the protein is a single species. Strongly protic solvents such as formic acid are the only reagents causing ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385192
更新日期:1971-12-01 00:00:00
abstract::Developing seeds ofPharbitis nil accumulate free as well as bound gibberellins until a maximum level is reached at approximately 25 days after anthesis. Seeds from CCC-treated parent plants have a strongly reduced level of free as well as bound gibberellins. When different spray reagents were used it was found that tr...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385821
更新日期:1971-12-01 00:00:00
abstract::The scanning electron-microscope was used to obtain a more adequate view of the separation surfaces exposed when the stem was pulled from the fruit of Valencia orange. Separations were made at 0, 24 and 48 h after ethylene treatment of the fruit. The most noticeable differences are the lessened amount of tearing in pr...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390215
更新日期:1971-12-01 00:00:00
abstract::In the initial phase of the geotropical reaction of the Chara rhizoid the growth difference postulated by Sievers (1967c) between the physically upper, slightly subapical flank and the lower one is demonstrated. In horizontal exposure the growth of the extreme cell apex is continued, while the growth of the lower flan...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386948
更新日期:1971-12-01 00:00:00
abstract::Analysis of pea root tips taken from attached seedling roots and excised roots cultured in vitro has revealed major differences in cell constituents. The cells of cultured roots have only 40% and 13% of the protein and amino acid content of attached root cells. The nucleic acid content of cultured root cells was shown...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387043
更新日期:1971-09-01 00:00:00
abstract::The salt glands of Aegiceras corniculatum have been examined by light- and electron-microscope techniques. A gland consists of a large number of abutting secretory cells and a single, large basal cell. The secretory cells and basal cell are joined by well defined plasmodesmata. The glandular cuticle shows differences ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386836
更新日期:1971-09-01 00:00:00
abstract::The ultrastructure of root cells of the germinating corn embryo has been studied during the first 72 hours of soaking. The most spectacular ultrastructural modifications occur in the nucleus. In the dry seed, the chromatin is heavily condensed and complete dispersion occurs during the first 8 hr of germination. The nu...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389201
更新日期:1971-09-01 00:00:00
abstract::O2-uptake and CO2-release by a chlorophyll-free, carotenoid-containing mutant of Chlorella vulgaris increase on addition of Na-glycolate by factors of 4-5 and 5-6, respectively (Fig. 1). In an enzyme preparation of that alga (sonification, centrifugation, precipitation with 0-30% (NH4)2SO4, dialysis) activity of glyco...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387441
更新日期:1971-09-01 00:00:00
abstract::Anaerobic conditions completely block the synthesis of carotenoids in Fusarium aquaeduciuum or Neurospora crassa. Even after sufficient illumination of the mycelia in the presence of air, the subsequent production of carotenoids in the dark is suppressed entirely when the fungi are transferred to an oxygen-free atmosp...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386832
更新日期:1971-09-01 00:00:00
abstract::Light-grown dwarf peas were disbudded except for a single lateral bud, then transferred to darkness at 24° C. During the dark period the seedlings were irradiated daily for 5 or 7 min with R or FR. The buds exposed to R developed into shoots faster than those irradiated with FR. The R effect was FR reversible, and the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387631
更新日期:1971-06-01 00:00:00
abstract::The qualitative and quantitative composition of the carotenoids of young cells of Euglena gracilis strain 1224-5/9 corresponded to that of the "Z"-strain.The frequently observed yellow-reddish discolouration of ageing cells was found to be caused by a heavy breakdown of the chlorophylls and not by an increased synthes...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387621
更新日期:1971-06-01 00:00:00
abstract::The inhibition of hypocotyl lengthening in intact mustard seedlings is controlled by two photosensitive systems which can be experimentally separated. 1. Kinetics of the growth response in the dark after red and far-red irradiation (Figs. 1, 2) demonstrate the operation of Pfr in the ground state via a threshold mecha...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385217
更新日期:1971-06-01 00:00:00
abstract::The development of characteristic cytoplasmic inclusions from endoplasmic-reticulum (ER) cisternae in nucellar cells of some species of Euphorbia has been studied by electron microscopy. The formation of these organelles is preceded by the appearance of rough ER cisternae filled with an electron-dense material and for...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388245
更新日期:1971-06-01 00:00:00
abstract::1. At relatively low concentrations, UdR generally enhances the inhibition caused by 5-BUdR. When the concentration of UdR is progressively increased, an inversion of the effects of UdR is observed; this inversion may go as far as complete reversal of the inhibition caused by 5-BUdR in the case of hypocotyl growth. 2....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384866
更新日期:1971-06-01 00:00:00
abstract::When radioactive gibberellin A5 ((3)H-GA5) was applied to the apices and surrounding young leaves of the long-day plant Silene armeria, it was partially converted to at least two other acidic substances. One of them was similar to GA3 in chromatographic, but not in biological properties. The other metabolite was more ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385349
更新日期:1971-06-01 00:00:00
abstract::Non-propagating, asynchronous action potentials may be detected with an extracellular electrode placed on the hook of the pea epicotyl following mechanical stimulation. These may well mediate the release of ethylene which has previously been shown to control the diameter of mechanically stressed shoots. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386758
更新日期:1971-06-01 00:00:00
abstract::Redlight is known to increase the growth potential in the embryo of photodormant lettuce seed, enabling it to overcome the resistance offered by the seed coats (particularly the endosperm) or by an osmotically active medium. Determinations of the water potential of lettuce embryos germinating in osmoticum. carried out...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387687
更新日期:1971-03-01 00:00:00
abstract::A study of the structure and arrangement of nuclear pores has been made in a number of species. In Selaginella kraussiana, the species investigated most extensively, the pores were arranged in a manner consistent with the view that each pore was located at the centre of an hexagonal structure lying on the nuclear surf...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386883
更新日期:1971-03-01 00:00:00
abstract::Auxin activity was detected in honeydew obtained from the aphid Tuberolachnus salignus (Gmelin) feeding on willow (Salix viminalis). Active uptake of (14)C-indolyl-3-acetic acid (IAA) into the sieve tubes was demonstrated by irrigating the cambial surface of willow bark with (14)C-IAA solution and assaying aphid style...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392122
更新日期:1971-03-01 00:00:00
abstract::Conjugation was studied in Schizosaccharomyces pombe using liquid media. Nitrogen, which was growth-limiting in a synthetic medium, had to be consumed completely before conjugation could start. Conjugation was preceded by sexual agglutination. Agglutinability was not constitutive in heterothallic strains. It only deve...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387025
更新日期:1971-03-01 00:00:00
abstract::Sieve-tube plastids of Aristolochia (5 species investigated) contain several starch grains and always one large crystalloid. In Asarum (3 species investigated) starch has not been found in the sieve-tubes. Their plastids contain several cuneate crystalloids that are sometimes arranged around an invisible centre. Asaru...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388406
更新日期:1971-03-01 00:00:00
abstract::Seedlings of Sinapis alba which were grown in light for 24, 48 and 72 h after 36 h of dark treatment renew elongation when transferred to dark again. The rate of elongation decreases with increased light treatment. The per cent as well as absolute inhibition of elongation by FUDR decreases with the duration of light t...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00397902
更新日期:1971-03-01 00:00:00
abstract::Protoplasts were isolated from palisade tissue of tobacco leaves by treatment with pectinase and cellulase under aseptic conditions, and were cultured in a synthetic liquid medium. Calcofluor, a fluorescent brightener, was found to be an excellent stain for plant cell walls and was used to demonstrate regeneration of ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385097
更新日期:1970-12-01 00:00:00
abstract::Embryogenesis occurs in cells from brome grass grown in suspension culture in defined medium. Exogenous hormones are not required. The embryos develop into plants which lack chlorophyll. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384708
更新日期:1970-12-01 00:00:00
abstract::Furfural uptake was studied with regard to possible mechanisms of inducing germination in ascospores. Uptake was found to involve a large, weakly bound reversible component and a small tightly bound irreversible component. Localization experiments indicate that almost all of the furfural removed from the media is boun...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385758
更新日期:1970-12-01 00:00:00
abstract::The movement of (14)C from indole-3-acetic acid (IAA) (14)C has been examined in 5 mm root segments of dark-grown seedlings of Helianthus annuus and Brassica oleracea. Contaminants from distilled water, phosphate buffer and the razor-blade cutter increase the decarboxylation of IAA-(14)C, and cutting of root segments ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384107
更新日期:1970-12-01 00:00:00
abstract::Ectodesmata-like structures, referred to here as mercurous or mercury precipitates (MP) and considered to be identical to precipitates observed after treatment of leaf tissue with Gilson solution for demonstration of ectodesmata, were demonstrated with cuticle enzymatically isolated from Allium bulb scales and leaves ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388553
更新日期:1970-09-01 00:00:00
abstract::Out of 33 strains of unicellular algae examined, H2 evolution was observed only in species of Chlamydomonas, Chlorella and Scenedesmus. While the photoevolution of H2 by these algae was generally stimulated both by an organic substrate and by the uncoupler CCCP(1), response to DCMU varied. On the basis of the response...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385481
更新日期:1970-09-01 00:00:00
abstract::Unrolling of etiolated wheat leaf segments is stimulated by short periods of exposure to red light. Both gibberellic acid and kinetin will stimulate unrolling in the dark, whereas abscisic acid (ABA) inhibits the unrolling response to these two hormones and to red light. Exposure to 5 minutes of red light leads to a r...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387180
更新日期:1970-09-01 00:00:00
abstract::The profile of (14)C, that is the plot of log (radioactivity) against distance, down the stem of Helianthus seedlings was studied over the course of the first hour after feeding (14)C to a leaf. These seedlings are shown to accumulate a large proportion of the total (14)C present in the stem in an ethanol insoluble fo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385091
更新日期:1970-09-01 00:00:00
abstract::Grains retained on the plants of some cultivars of common bread wheat lose dry matter after ripeness is attained, but later gain dry matter again. We conclude that the post-ripe plant may remain metabolically active. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386134
更新日期:1970-09-01 00:00:00
abstract::Throughout a period of 23 days, during which the photosynthesis, growth and transpiration of two species of Atriplex were compared, A. spongiosa, a "C4" species (first products of photosynthesis = 4-C dicarboxylic acids), maintained net rates of leaf photosynthesis as high as, or higher than, those of A. hastata, a "C...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387639
更新日期:1970-09-01 00:00:00
abstract::The typical wound respiration drift (O2 und CO2) of 1 mm disks, which amounts to 6 times the values measured immediately after derepression, develops only if cicatrization takes place, but never in proliferating or non-proliferating tissues without suberin biosynthesis. The respiration rate of the latter is merely app...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388040
更新日期:1970-06-01 00:00:00
abstract::Ferredoxin from the alga Bumilleriopsis filiformis Vischer (Xanthophyceae) is characterized by comparing some of its properties with spinach ferredoxin.It is similar to the known plant ferredoxins in the following points: a) Absorption spectrum. b) Molecular weight. c) Amino acid composition (approx. 100 amino acid re...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385204
更新日期:1970-06-01 00:00:00
abstract::Cultured slices of cotyledon tissue from 60-day broad bean have been shown to synthesise globulin protein extensively. About 80% of the (3)H-leucine incorporated into protein was incorporated into globulin protein; (35)S-sulphate was also incorporated by the slices.The rate and dependence of the incorporation on the q...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387243
更新日期:1970-06-01 00:00:00