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
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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::The vacuolar pH of individual cells of the epidermis of intact leaves of Commelina communis L. has been determined using pH sensitive microelectrodes. The results show that the pH of the guard cells increases by approximately 0.5 units during stomatal opening. The changes in vacuolar pH mirror the changes in vacuolar ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388660
更新日期:1975-01-01 00:00:00
abstract::Leaf tissue of the panicoid grass Pennisetum purpureum (Schum) and of the chloridoid grass Muhlenbergia montana (Hitchcock) were fractionated to produce preparations enriched in the contents of mesophyll and bundle sheath cells. Sucrose phosphate synthetase and sucrose synthetase were found predominantly in the mesoph...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385403
更新日期:1975-01-01 00:00:00
abstract::Portulaca oleracea L. has some features common to C4 species but it has been suggested from other studies that a substantial proportion of assimilated carbon dioxide is incorporated into pyruvate and alanine by routes not involving C4 acids or 3-phosphoglycerate. The present paper reports that enzyme activities in P. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385603
更新日期:1975-01-01 00:00:00
abstract::Discs punched out of different zones of the found of Laminaria hyperborea (Gunn.) Fossl. were exposed to H(14)CO3 (-) in the light and in the dark for various lengths of time. Photosynthetic rates in young and old parts were in the same range, 12-39 μmol CO2 dm(-2) h(-1) at 4°C, whereas dark fixation was remarkably hi...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388702
更新日期:1975-01-01 00:00:00
abstract::It is concluded from (14)C labelling kinetics as well as from enzyme analysis that formation of malate and aspartate from glycerate-3P via carboxylation of P-enolpyruvate occurs in isolated photosynthesizing spinach (Spinacia oleracea L.) chloroplasts. Carbon incorporation into both dicarboxylic acids was about 1% of ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388873
更新日期:1975-01-01 00:00:00
abstract::The changes in packed cell volume and in nitrate content and conductivity of the medium during the growth cycle of cell suspension cultures from Petroselinum hortense Hoffm., Glycine max Merr., and Haplopappus gracilis A. Grey in a chemically defined medium were compared. In all three cases sigmoidal curves obtained f...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388694
更新日期:1975-01-01 00:00:00
abstract::1. In Scenedesmus acutus Tomaselli, endogenous variations in cell progeny production and chlorophyll formation have been found which are very similar to those previously described in Chlorella by Hesse (Z. Pflanzenphysiol. 67, 58-77, 1972). When the dark phase of the light-dark-cycle is prolonged to a certain extent, ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388684
更新日期:1975-01-01 00:00:00
abstract::Cotyledons of mustard (Sinapis alba L.) seedlings irradiated with far-red light were shown to synthesize high molecular weight precursor rRNA (2.4×10(6)-2.9×10(6) dalton) at a considerably enhanced rate compared to dark-grown cotyledons. This result was obtained by pulse-labelling cotyledons isolated from 48 h old see...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384765
更新日期:1975-01-01 00:00:00
abstract::The fixation pattern of radioactive labelled photosynthetic intermediates was followed under steady state conditions during prolonged dark starvation of spinach plants (Spinacia oleracea L.). It is suggested that the considerable increase of radioactive dihydroxyacetonephosphate is correlated with a specific leakage o...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384755
更新日期:1975-01-01 00:00:00
abstract::In the course of the life cycle of synchronized Euglena gracilis (14: 10 h light-dark cycles) two separate peaks of plastidial DNA synthesis appear. A first maximum (stage I) occurs 1 to 2 hours, after initiation of the light period, the second maximum (stage II) 9 to 10 hours after beginning of the light period. The ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390074
更新日期:1975-01-01 00:00:00
abstract::Addition of an osmoticum (-12 bars) to the rooting medium of sunflowers (Helianthus annuus L.) caused an increase in the level of abscisic acid (ABA) present in xylem exudate subsequently collected from cut shoots. Using tall and dwarf plants it was shown that there was a time lag in the appearance of increased levels...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390064
更新日期:1975-01-01 00:00:00
abstract::The isotopic composition of the carbon (δ(13)C values) of leaf tissue from 10 species and hybrids of orchids grown in Singapore fell into two groups, one having a mean value of-15.4‰, the other-26.6‰. The least negative of these values was associated with thick-leaved plants (0.2-0.4 mm). This is consistent with the v...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390710
更新日期:1975-01-01 00:00:00
abstract::A brief irradiation with red light of pea (Pisum sativum L.) shoot segments kept at 0° resulted in very rapid binding of both Pr and Pfr to mitochondrial and microsomal fractions. The effect was not far-red reversible. The amount of phytochrome bound to the mitochondrial fraction was proportional to the percentage of ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390699
更新日期:1975-01-01 00:00:00
abstract::On intact, 3-week-old plants of Phaseolus the larger bud in the axils of the primary leaves shows slow, continuous elongation growth. Release from correlative inhibition can be detected within 30 min following decapitation. When 0.1% indoleacetic acid in lanolin is applied to the decapitated stem stump, the lateral bu...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00383862
更新日期:1975-01-01 00:00:00
abstract::Exogenous gibberellic acid, A3 (GA3) inhibits phytochrome mediated betacyanin synthesis in seedlings of Amaranthus caudatus. The growth retardants, β-chloroethyl-trimethylammonium chloride (CCC), 'isopropyl-4'-(triethylammonium chloride)-5'-methylphenyl piperidine carboxylate (AMO 1618) and tributyl-2,4,-dichlorobenzy...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380717
更新日期:1975-01-01 00:00:00
abstract::The patterns of nitrate uptake, nitrate reductase activity in the leaves, and nitrogen fixation by the nodules were investigated in field-grown soybeans (Glycine max (L.) Merr.) over the growing season.The level of nitrate-reductase activity generally paralleled the concentration of nitrate in the leaf tissue over the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388374
更新日期:1975-01-01 00:00:00
abstract::Primary roots of Lepidium sativum (L.s.) grew upwards in glass capillaries in order to prevent mechanically the geotropic curvature. The central cap cells (statocytes) were investigated with regard to the polar arrangement of their organelles. After 20 minutes of inversion, which correspond to the latent period of L.s...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388858
更新日期:1975-01-01 00:00:00
abstract::The effect of low concentrations of 3,5-diiodo-4-hydroxybenzoic acid (DIHB) in promoting the elongation of light-exposed cress (Lepidium sativum L.) roots has been further examined. Aeration of the DIHB solution in which the roots were grown largely removed the growth promotion. The addition of ethylene or the ethylen...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388968
更新日期:1975-01-01 00:00:00
abstract::Acropetal movement of [2-(14)C] abscisic acid (ABA) in long root segments of P. coccineus is drastically reduced by destruction of the tissue, low temperature, anaerobic conditions and pretreatment with CCCP (carbonyl-cyanide-m-chloro-phenylhydrazone) at uncoupling concentrations. Basipetal transport is not affected b...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380621
更新日期:1975-01-01 00:00:00
abstract::Light inhibits the rate of stem elongation of Phaseolus coccineus L. seedlings. Gibberellin A4 (GA4), an endogenous component of Phaseolus seedlings (Bowen et al., Phytochem. 12, 2935-2941, 1973) promotes stem growth in the light but not in darkness. Dark-grown seedlings contain larger GA pools than light-grown plants...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389362
更新日期:1975-01-01 00:00:00
abstract::The distribution of six cytokinins [zeatin, zeatin riboside, 6-(4-hydroxy-3-methylbutylamino)purine, 6-(3-methylbut-2-enylamino)purine and its riboside, and kinetin] between aqueous buffers (pH 3.0 and 7.0) and several organic solvents was assessed and partition coefficients calculated. Purification of cytokinins from...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385586
更新日期:1974-12-01 00:00:00
abstract::Protoplasts of Vicia hajastana Grossh. obtained from suspension-culture cells and Pisum sativum L. obtained from leaves adhered tightly to each other in concentrated solutions of high-molecular-weight polyethylene glycol (PEG). The adhesion occurred non-specifically between the free protoplasts from the same species a...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388618
更新日期:1974-12-01 00:00:00
abstract::Sorghum plants that had been subjected to different degrees of water stress were examined for the occurrence of endogenous compounds capable of inducing stomatal closure, i.e. "antitranspirants". Acidic extracts contained increased amounts of abscisic acid (ABA) as the amount of stress increased, but another highly ac...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388024
更新日期:1974-12-01 00:00:00
abstract::Enzymes representative of, and related to, the pentose phosphate pathway, glycolysis, and the tricarboxylic acid cycle have been demonstrated in supernatant and lamellar fractions of Anabaena cylindrica cultured in the presence of atmospheric nitrogen, ammonia, nitrite, and nitrate. Nitrogen-fixing and ammonia-assimil...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390227
更新日期:1974-09-01 00:00:00
abstract::Elongating upper and non-elongating lower segments of mung bean hypocotyls (Phaseolus aureus Roxb.) were compared in their ability to incorporate labelled polymers into their cell walls when fed with [(14)C]proline. The non-growing segments incorporated more amino acids into the walls and showed a higher degree of hyd...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00429047
更新日期:1974-09-01 00:00:00
abstract::Haploid plants of Nicotiana tabacum L. were produced in greater numbers from anthers on agar medium containing activated charcoal than on the same medium without charcoal. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390524
更新日期:1974-09-01 00:00:00
abstract::Six authentic gibberellins marginally promoted hypocotyl lengthening of etiolated lupin seedlings whereas extracted lupin "gibberellin-like" compounds were ineffective. However, dwarfing by AMO-1618 [2'-isopropyl-4'-(trimethyl-ammonium chloride)-5'-methylphenyl piperidine carboxylate] was totally counteracted by co-ap...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388394
更新日期:1974-09-01 00:00:00
abstract::Changes in phytic acid, phytase, and inorganic phosphate were examined in the cotyledon of Phaseolus vulgaris L cv. Taylor's Horticultural during embryogeny and germination. Embryogeny normally requires 36 days in this cultivar. Phytic acid is accumulated most rapidly between days 24 and 30. Coincident with this incre...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380643
更新日期:1974-06-01 00:00:00
abstract::As seen in the scanning electron microscope the surface wax of leaves of Phormium tenax L. consists of vertical, plate-like crystals. These increase in size and number and undergo a change in form during development. The abaxial surface has a dense covering of wax crystals, but none are present on the ridges over vasc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390884
更新日期:1974-06-01 00:00:00
abstract::Some ionic relations of the filamentous green alga Mougeotia sp. have been analyzed under different light conditions. Data from influx and efflux measurements using (86)Rb(+) and (36)Cl(-) fit the model of three cellular compartments (cell wall, cytoplasm, vacuole) in series. This result is remarkable, since in a Moug...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388390
更新日期:1974-06-01 00:00:00
abstract::Cycloheximide (CH) inhibited the division of generative cell in pollen cultures of Impatiens balsamina in concentrations of 1-200 μg/ml without affecting pollen germination or pollen tube growth. This inhibition was reversible up to 3 h in hanging drop cultures and up to 6 h in test tube cultures by replacement of the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390799
更新日期:1974-06-01 00:00:00
abstract::The properties of two enzymes involved in the shikimic acid pathway, dehydroquinate hydro-lyase and shikimate: NADP(+) oxidoreductase were studied in different species of higher plants (pteridophytes, gymnosperms, angiosperms) using chromatography on Sephadex G 100, DEAE cellulose, hydroxylapatite and isoelectric focu...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390823
更新日期:1974-03-01 00:00:00
abstract::Conductivity changes in the medium of cultured soybean (Glycine max L.) cells were shown to be strictly correlated with nitrate uptake and growth of the cultures. A continuous record of the conductivity was used as a simple and reliable method of determining specific growth stages and concomitant peaks in the activiti...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390504
更新日期:1974-03-01 00:00:00
abstract::The relationship of the antheridogen from Ceratopteris thalictroides (L.) Brongn. (Antheridogen C) to three other known antheridogens, gibberellic acid, and two natural antheridogens, one from Pteridium aquilinum (Antheridogen A) and one from Anemia phyllitidis (Antheridogen B), is investigated. It is shown that each ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390201
更新日期:1974-03-01 00:00:00
abstract::Phosphoenolpyruvate (PEP) carboxylase has been isolated from etiolated and light-grown sugar cane, and a comparison made of the physical and kinetic characteristics of the enzymes. Differences were found in the DEAE-cellulose elution profiles, in saturation kinetics with PEP as variable substrate and with Mg(2+) as va...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388679
更新日期:1974-03-01 00:00:00
abstract::Uptake of silicic acid in the diatoms Navicula pelliculosa and Nitzschia alba was studied, using the natural isotope, (28)Si, or a radioisotope, (31)Si. The rate of uptake of silicic acid was also determined by using [(68)Ge]germanic acid as a tracer of silicic acid. At a given silicicacid concentration in the growth ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389321
更新日期:1974-01-01 00:00:00
abstract::We have examined the activity and regulation of the glycolate oxidizing enzyme in ten different greening stages of the Chlorella mutant Chlorella fusca C-1.1.10.10 The mutant has lost the ability to form chlorophyll in the dark. The dark grown cells exposed to light need after a short lag phase about 12 hs for normal ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388755
更新日期:1974-01-01 00:00:00
abstract::Late-formed metaphloem sieve-elements in the vascular bundles of the leaf and pedicels of Zea differ from the typical sieve elements by having thicker cell walls and larger, elongate plastids. The plastids contain a quasi-crystalline structure which is different from that observed in the spherical plastids of sieve el...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384002
更新日期:1974-01-01 00:00:00
abstract::Lipid extracts from Sorghum sudanese Stapf (cv Piper) that had been subjected to different degrees of water stress contained increasing amounts of a sesquiterpenoid, other than abscisic acid, as the amount of stress increased and subsequent bioassay showed that this substance was capable of inducing stomatal closure. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390293
更新日期:1974-01-01 00:00:00
abstract::A simple method is described for the isolation of intact nucleic from rice tissue (Oryza sativa L.) grown in suspension culture. The procedure involves incubation of the tissue for 4 h with cellulase and pectinase prior to disruption of the cells. The yield of nucleic is approximately 40% (DNA basis) and the preparati...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384931
更新日期:1974-01-01 00:00:00