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::Action spectra for chromatic adaptation in Fremyella diplosiphon Drouet have been determined using techniques previously described. Action maxima are at 540 nm, with a half-band width of 80 nm, for induction of phycoerythrin synthesis (green action) and at 650 nm, with a half-band width of 90 nm, for reversal of induc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391993
更新日期:1978-01-01 00:00:00
abstract::Four mutants of maize (Zea mays L.) defective in chlorophyll biosynthesis have been analyzed with regard to the sites of their lesions and their effects on chloroplast development. Two yellow mutants, which accumulate no detectable porphyrin precursors when grown in darkness, are defective in the conversion of protopo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387791
更新日期:1978-01-01 00:00:00
abstract::Zearalenone (F-2), an estrogenic factor produced by a number of Fusarium spp., stimulates a leakage of electrolytes, β-cyanin and aminoacids from three plant tissues. F-2 inhibits rubidium uptake in roots of Zea mays L. and Beta vulgaris L. var. rubra. However the effect in the latter tissue is evident after long-term...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389051
更新日期:1978-01-01 00:00:00
abstract::Dikegulac sodium 2,3:4,6 di-O-isopropylidene-2-keto-L-gulonate) is a translocatable agent used for chemically 'pinching' terminal buds to break apical dominance. It does not inhibit mature leaves. Cell culture systems were developed and used to ascertain whether or not it differentially inhibits green tissue and wheth...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385078
更新日期:1978-01-01 00:00:00
abstract::To test the morphogenetic role of equilateral stress and physiological confinement in dedifferentiation of epidermal cells, impermeable barriers of goldmetal foil were placed between the postgenitally fusing epidermal surfaces in the gynoecium of Catharanthus roseus (L.) G. Don. Cells contacting the foil barrier were ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388210
更新日期:1978-01-01 00:00:00
abstract::In etiolated rye seedlings (Secale cereale L.) the cytokinin supply controls leaf growth. Dry weight and total amino-nitrogen, protein, total nucleic acid, DNA, and rRNA levels were similarly lowered in leaves depleted of their endogenous cytokinin supply by early excision of the seedling roots and increased by 70-100...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385122
更新日期:1978-01-01 00:00:00
abstract::An inactivated nitrate reductase (EC 1.6.6.1) formed in vivo by the green alga Chlorella fusca Shihira and Kraus is shown to be a cyanide complex. The partially purified inactive enzyme releases 0.048 nmol of HCN per unit of enzyme activated. This compares with 0.066 nmol of HCN liberated in similar previous measureme...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388351
更新日期:1978-01-01 00:00:00
abstract::Nuclear DNA (ncDNA) synthesis in Chlamydomonas reinhardtii was measured by both (32)P[or-thophosphoric acid] ((32)P) and [(14)C]adenine incorporation and found to be highly synchronous. Ca. 85% of incorporation was confined to the first 6 h of the dark period of a synchronized regime consisting of an alternating light...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388341
更新日期:1978-01-01 00:00:00
abstract::After sowing, mustard (Sinapis alba L.) seedlings were grown for 48 h in white light (25°C). These fully de-etiolated, green seedlings were used as experimental material between 48 and 72 h after sowing to study the control by phytochrome (Pfr) of hypocotyl elongation after a white light→dark transition. It was found ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387892
更新日期:1978-01-01 00:00:00
abstract::The halotolerant phytoplankton alga Dunaliella tertiolecta was found to be able to synthesize considerable amounts of sucrose. Because this is in contradiction to the current literature, the physiologic conditions required for sucrose biosynthesis were investigated. Sucrose is only synthesized above a jump temperature...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387882
更新日期:1978-01-01 00:00:00
abstract::The castor-bean endosperm-the best-studied material of reserve lipid hydrolysis in seed germination-was previously shown to have an acid lipase and an alkaline lipase having reciprocal patterns of development during germination. We studied oil seeds from 7 species, namely castor bean (Ricinus communis L.), peanut (Ara...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387752
更新日期:1978-01-01 00:00:00
abstract::Abscisic acid (ABA) caused a 7-8-fold increase in volume flow in excised bean root systems and this was coupled with an increase in (42)K, (36)Cl and (24)Na flux into the xylem. The transport of (42)K and (36)Cl increased by a factor larger than the stimulation of volume flow, resulting in an increase in the concentra...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387742
更新日期:1978-01-01 00:00:00
abstract::A sulfotransferase isolated from the Cyanobacterium Synechococcus 6301 was found to be specific for 3'-phosphoadenosine-5'-phosphosulfate (PAPS). The molecular weight of this transferase has been estimated on a Sephadex-G-100 column to be about 58,000. The K m for PAPS was determined to be 20 μM. The pH optimum was 8....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390254
更新日期:1978-01-01 00:00:00
abstract::Elongation growth and gibberellin (GA9) metabolism in excised hypocotyls of lettuce (Lactuca sativa L. cv. Arctic) were investigated. Exogenously supplied GA9 stimulates elongation of hypocotyl sections and this response is intermediate between that elicited by GA1 or GA20 and GA4/7 mixture. Although uptake of radioac...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384913
更新日期:1978-01-01 00:00:00
abstract::Freeze-etch observations of protoplasts isolated from tobacco (Nicotiana tabacum L.) mesophyll tissue and tomato (Lycopersicum esculentum Mill.) fruit locule tissue are described which clarify earlier observations (Burgess, J., Fleming, E.N., Planta 131, 173-178, 1976; Planta 133, 267-273, 1977), obtained using scanni...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389379
更新日期:1978-01-01 00:00:00
abstract::Lipid synthesis was studied in successive leaf sections from the base to the tip of developing barley (Hordeum vulgare L.), maize (Zea mays L.), rye grass (Lolium perenne L.) and wheat (Triticum aestivum L.) leaves. The endogenous levels of acyl lipids and their constituent fatty acids from the same leaf sections were...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388640
更新日期:1978-01-01 00:00:00
abstract::Alfalfa (Medicago sativa L. cv. Canadian No. 1), tobacco (Nicotiana tabacum L. var. humilis) and wheat (triticum monococcum L.) cells were grown in a defined, liquid medium containing either ammonium sulfate, L-glutamine or potassium nitrate as the sole nitrogen source, and the effects of the tricarboxylic-acid (TCA) ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388630
更新日期:1978-01-01 00:00:00
abstract::The sequence of events leading up to the establishment of symbiotic nitrogen-fixation were studied in two tropical legumes, Centrosema pubescens Benth, and Vigna unguiculata L. Walp. Parameters measured included fresh and dry weights, chlorophyll and leghaemoglobin contents, as well as the activities of NADH-nitrate r...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387146
更新日期:1978-01-01 00:00:00
abstract::Aspartate kinase (EC 2.7.2.4.) has been purified from 7 day etiolated wheat (Triticum aestivum L. var. Maris Freeman) seedlings and from embryos imbibed for 8 h. The enzyme was 50% inhibited by 0.25 mM lysine. In this study wheat aspartate kinase was not inhibited by threonine alone or cooperatively with lysine; these...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387136
更新日期:1978-01-01 00:00:00
abstract::In crude extracts of primary leaves from dark grown seedlings of Phaseolus vulgaris L., relatively high hydrolytic activity of chlorophyllase (chlorophyll-chlorophyllido-hydrolase, EC 3.1.1.14) was observed. When plants were exposed to continuous illumination, the enzyme activity in the extracts was doubled within 3 d...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390814
更新日期:1978-01-01 00:00:00
abstract::The presence of water-soluble compounds in sectioned plant tissue can be visualized in negative contrast by freeze-substitution in acetone, followed by embedment in Epon containing 6% Sudan B. The contents of mature sieve tubes and companion cells of bean (Phaseolus vulgaris L.) showed strong, and mostly uniform, nega...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390804
更新日期:1978-01-01 00:00:00
abstract::Soluble proteins extracted with Tris-buffer pH 8.8 from different mosses are analysed by microgelelectrophoretic method for comparison to the specific proteins present only in the caulonema of Funaria hygrometrica. The protein patterns are also compared with those of liverwort, fern gametophytes and sporophytes and to...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386825
更新日期:1978-01-01 00:00:00
abstract::Fatty acid synthesis was studied in successive leaf sections from the base to the tip of developing barley (Hordeum vulgare L.), maize (Zea mays L.), rye grass (Lolium perenne L.) and wheat (Triticum aestivium L.) leaves. The basal regions of the leaves had the lowest rates of fatty acid synthesis and accumulated smal...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386815
更新日期:1978-01-01 00:00:00
abstract::In crude extracts from the primary leaf of wheat seedlings, Triticum aestivum L., cv. Olympic, maximum proteinase activity, as determined by measuring the rate of release of amino nitrogen from ribulose-bisphosphate carboxylase (RuBPCase), was found to be obtained only when EDTA and L-cysteine were included in the ext...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391172
更新日期:1978-01-01 00:00:00
abstract::Crude chromatin preparations from pea seedlings contain calcium-dependent deoxyribonuclease activity, at least part of which is endonucleolytic. During germination, there is a dramatic increase in chromatin-bound deoxyribonuclease activity in the embryonic axis immediately prior to the onset of DNA replication. Eviden...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392923
更新日期:1978-01-01 00:00:00
abstract::Apical cells on the verge of dividing, or having recently formed a new segment, or actually dividing, are not uncommonly encountered in bryophytes and pteridophytes. This is interpreted as evidence for the "classical" concept of active apical segmentation in these plants (versus the concept of a quiescent apical cell)...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392913
更新日期:1978-01-01 00:00:00
abstract::[1-(14)C]glycollate was oxidised to(14)CO2 by peroxisomes isolated from leaves of spinach beet about 3 times as rapidly at 35°C as at 25°C; the rate was further increased with rise in temperature to a maximum at 55°C. These increases are shown to be mainly due to the increased H2O2 available to oxidise glyoxylate non-...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380687
更新日期:1977-01-01 00:00:00
abstract::In the ovary of Aptenia cordifolia and Platythyra haeckeliana placentary papillae produce a slime containing polysaccharides and proteins. These papillae show two types of conspicuous vacuoles enclosed by rough ER cisternae and complexes of concentrically arranged rough ER. The enclosed vacuoles probably play an impor...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391915
更新日期:1977-01-01 00:00:00
abstract::Seedlings of C. rubrum were irradiated with different light qualities and intensities following a single inductive dark period. Our results show that relatively low intensity white light (35-100 ft. c.) does not support flower development while high intensity white light (650-800 ft. c.) permits 100% flowering. We hav...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391905
更新日期:1977-01-01 00:00:00
abstract::In addition to membrane translocation, measured in the dark, it was found that pre-illumination of the chloroplasts resulted in an enhancement of sulfate uptake by 25% and of sulfite uptake by 55% as soon as the concentration of the ion in the incubation medium exceeded 2 mmol l(-1). This amount which is additionally ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388167
更新日期:1977-01-01 00:00:00
abstract::Transpiration from excised leaves of Anthephra pubescens Nees was enhanced by 1 and 10 mmol m(-3) kinetin. Stomatal opening in isolated epidermal strips of A. pubescens under CO2-free air and in the absence of K(+) was enhanced by 10 mmol m(-3) kinetin. ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388157
更新日期:1977-01-01 00:00:00
abstract::The effect of blue and red light on the synthesis of transfer and 5S ribosomal RNA in autotrophic cultures of Chlorella pyrenoidosa was studied by pulse labeling experiments with tritiated guanosine. Compared with darkness or red light (679 nm), blue light (457 nm) of low intensities (quantum flux: 0.5-5×10(-10) mol p...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387550
更新日期:1977-01-01 00:00:00
abstract::Dark-grown radish seedlings (Raphanus sativus L.) were sprayed with 10(-3) mol·l(-1) 2,4-dichlorophenoxyacetic acid and then were exposed to a 14:10 light: dark cycle. Cotyledon samples from these seedlings and unsprayed controls were taken for electron microscopy, chlorophyll determinations, and photosynthetic rate m...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394437
更新日期:1977-01-01 00:00:00
abstract::The nuclei of active, sieve cell-associated Strasburger cells in the secondary phloem of Pinus nigra var. austriaca (Hoess) Badoux have been studied for their structure and DNA and RNA content. No difference in size compared to those of ordinary ray cells was found. The nuclear surface is often increased by an ameboid...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00394427
更新日期:1977-01-01 00:00:00
abstract::The properties of the water-soluble metabolites of [(3)H]gibberellin A1 ([(3)H]GA1) from lettuce (Lactuca sativa L.) hypocotyls were compared with those of authentic samples of gibberellin (GA) glucosyl esters and ethers. Partitioning against l-butanol at high and low pH was not an efficient method of differentiating ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385994
更新日期:1977-01-01 00:00:00
abstract::Vascular bundles of petioles below wilted leaves of Nymphoides peltata (S.G. Gmel. O. Kuntze) were frozen intact and freeze-fractured for electron microscopy. Cell walls in them appeared drawn in against the helical thickenings of xylem vessels. By contrast, walls round vessels which had been frozen in vascular bundle...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385984
更新日期:1977-01-01 00:00:00
abstract::The effect of external calcium and sodium ion concentrations on the calcium fluxes on the Pelvetia fastigiata De Toni egg was measured. Decreasing external [Ca(2+)] greatly increased the permeability of the eggs to Ca(2+); at 1 mM external Ca(2+) this permeability was 60 times as great as it was at the normal [Ca(2+)]...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00396191
更新日期:1977-01-01 00:00:00
abstract::A sensitive new fluorescent method is outlined for the study of peptide and amino acid transport processes. Studies on dipeptide transport in germinating barley (Hordeum vulgare.) embryos have provided evidence for accumulation of substrate against a concentration gradient, saturation kinetics, a pH optimum at pH 3.8,...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387928
更新日期:1977-01-01 00:00:00
abstract::The ontogenetic change taking place in the facultative photoperiodic response of A. retroflexus to inductive short-day (SD) conditions was studied by exposing plants to continuous induction after different initial exposures to long-days (LD), and comparing the kinetics of their developmental responses (cumulative numb...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387918
更新日期:1977-01-01 00:00:00
abstract::Callus cells of Daucus carota L. have different phenylpropanoid pathways depending on the medium composition. Cells propagated on a medium with gibberellic acid do not accumulate cyanidin but incorporate [(14)C]phenylalanine into chlorogenic acid at a high rate. Cells grown on a medium free of gibberellic acid accumul...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384906
更新日期:1977-01-01 00:00:00