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::The binding of fusicoccin to the microsomal preparations of maize roots in vitro is increased several-fold when segments of the tissue are washed for 2 h in distilled water before homogenization. Addition of freeze-dried wash solution to microsomal preparations of spinach leaves or fresh roots, washed roots, or coleop...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380028
更新日期:1980-04-01 00:00:00
abstract::The kinetics and localization of Rb(+) uptake by barley roots were studied as function of the water potential of the medium. At potentials causing plasmolysis, uptake is reduced and becomes restricted to the outer surface of the root. The conclusion is that, at least for Rb(+) in the range of low external concentratio...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386413
更新日期:1980-03-01 00:00:00
abstract::Changes in membrane topography in the flagellate Poterioochromonas malhamensis, as a result of colchicine and osmotic-stress treatments, have been studied using freeze-fracturing and thin sectioning. Ridges, but not rows of intramembrane particles, in the PF-face which denote the position of underlying cortical microt...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385446
更新日期:1980-02-01 00:00:00
abstract::The first hours of seed germination are characterized by an increase in the rate of RNA synthesis. Although this change is most easily accounted for by changes in the ribonucleotide pool sizes, we investigated two other aspects of rRNA synthesis which are likely to contribute to the phenomenon. Using isolated radish e...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385436
更新日期:1980-02-01 00:00:00
abstract::Three peroxidase isoenzyme-groups found in cell walls of tobacco were tested for their capacity to form H2O2. Isoenzyme-group GI, located only in cell walls (GII and GIII are also found in protoplasts) showed the highest Kapp-value for H2O2-formation. The lowest Kapp-value, i.e., maximal H2O2-formation was received fo...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380189
更新日期:1980-02-01 00:00:00
abstract::Etioplasts, etiochloroplasts, and chloroplasts of Avena sativa L. purified on a Percoll gradient were subjected to increasing electric field strengths in the orifice of a hydrodynamically focussing Coulter Counter. The change in resistance of the orifice when an organelle is present correlates well with the size of th...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380179
更新日期:1980-02-01 00:00:00
abstract::Some botanical aspects of cell-free protein synthesizing systems from cereal embryos have been investigated. The composition of the starting material determines both the stability and translation fidelity of the cell-free extracts. The active components of the extracts originate exclusively from the primary axes. Cont...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00379838
更新日期:1980-01-01 00:00:00
abstract::A manganese-containing superoxide dismutase (EC 1.15.1.1) was purified to homogeneity from a higher plant for the first time. The enzyme was isolated fromPisum sativum leaf extracts by thermal fractionation, ammonium sulfate salting out, ion-exchange and gel-filtration column chromatography, and preparative polyacryla...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00582359
更新日期:1980-01-01 00:00:00
abstract::Irradiation of buoyant, gas-vacuolate cells of the cyanobacteriumMicrocystis aeruginosa by 5·10(4) Wm(-2) of blue light for 1 h caused a 5% loss of extractable ribulose bisphosphate carboxylase activity compared to dark and red-light controls. Ribulose bisphosphate carboxylase activity was unaffected by blue light in ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00571178
更新日期:1980-01-01 00:00:00
abstract::Autolysis of the suspensor, an embryonal haustorium, starts in the basal cells and proceeds in the direction of the embryo. InPhaseolus vulgaris, acid phosphatase activity is first found in transforming plastids, similar to the acid phosphatase activity inPh. coccineus [Nagl (1977) Z. Pflanzenphysiol.85, 45-51], altho...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00571168
更新日期:1980-01-01 00:00:00
abstract::Changes in fatty-acid metabolism were studied in soybean (Glycine max Merr.) cotyledons during senescence as well as in cotyledons which had been caused to regreen by removal of the epicotyl from the seedling. The activities of the enzymes acetyl-CoA synthetase (EC 6.2.1.1) and fatty-acid synthetase in plastids isolat...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388746
更新日期:1979-12-01 00:00:00
abstract::The adaxial leaf cuticle of Malus pumila was examined by electron microscopy to determine possible avenues for transcuticular movement of foliarly applied chemicals. Cutin-embedded polysaccharide microfibrils originated at the outer epidermal cell wall and occasionally extended to the cuticle surface. Lamellae, ca. 4 ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388736
更新日期:1979-12-01 00:00:00
abstract::Some 30% of the reserve material in the fenugreek seed is galactomannan localised in the endosperm; the remainder is mainly protein and lipid in the cotyledons of the embryo. The importance of galactomannan to the germinative physiology of fenugreek has been investigated by comparing intact and endosperm-free seeds. F...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00389515
更新日期:1979-12-01 00:00:00
abstract::A crude organelle preparation from germinating castor bean endosperm catalysed the incorporation of galactose from UDP[(14)C]galactose into chloroform/methanol (2:1)-soluble glactolipids. At least two galactolipids were formed. Most of the [(14)C]galactose was present in a galactolipid synthesized by the microsomal me...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384596
更新日期:1979-10-01 00:00:00
abstract::Phaseolus coccineus embryos at the heartshaped and the middle cotyledonary stages were cultured in vitro on media added with different concentrations of zeatin (Z) or zeatin riboside (Zr). Growth of early embryos was clearly favored by concentrations of Z from 10(-8) M to 10(-5) M, lower concentrations having no effec...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00384586
更新日期:1979-10-01 00:00:00
abstract::Epicotyl and primary leaves of pea seedlings (Pisum sativum L., var. Alaska) were found to contain soluble and microsomal enzymes catalyzing the addition of glutathione to the olefinic double bond of cinnamic acid. Glutathione S-cinnamoyl transfer was also obtained with enzyme preparations from potato slices and cell ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388845
更新日期:1979-10-01 00:00:00
abstract::The development of maximal rates of lipid and protein hydrolysis in cucumber cotyledons depends upon the removal of the testa and the presence of the embryonic axis. The testa appears to exert at least part of its inhibitory influence by suppressing the development of enzyme activity associated with lipolysis and prot...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388835
更新日期:1979-10-01 00:00:00
abstract::A particulate preparation from developing cotyledons of Phaseolus vulgaris L. was incubated with uridine-5'-diphospho-N-acetyl-D-glucosamine (UDP-GlcNAc; [6-(3)H]glucosamine), and by polyacrylamide gel electrophoretic analysis it was shown that the labeled (N-acetyl)glucosamine (GlcNAc) was incorporated into the princ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380867
更新日期:1979-09-01 00:00:00
abstract::Total RNA was extracted from fast growing suspension cells of bean, the mRNA was translated and the products of protein synthesis analysed by gel electrophoresis. Actinomycin D (20 μg ml(-1)) added to the cultures 12 h before the induction of phenylalanine ammonia-lyase (PAL) activity by naphthylacetic acid (NAA) (1 m...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380857
更新日期:1979-09-01 00:00:00
abstract::1. The effects of 2,4-dinitrophenol (DNP) and chemical modifying reagents on the transport of indol-3-yl acetic acid (IAA) and 2,4-dichlorophenoxyacetic acid (2,4 D) by suspension-cultured crown gall cells of Parthenocissus tricuspidata Planch. were investigated. 2. DNP smoothly reduced uptakes of both benzoic acid an...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387267
更新日期:1979-01-01 00:00:00
abstract::Polyribosomes which have template activity in the wheat germ system have been isolated from developing pea seeds. Some of the translation products have identical mobilities to the vicilin and legumin subunits by SDS-PAGE. Certain products were specifically immunoprecipitated with antisera prepared against purified vic...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380122
更新日期:1979-01-01 00:00:00
abstract::The role of purine and pyrimidine ribosides, nucleotides and substituted xanthines in the differentiation of chloronema filaments in suspension cultures of protonema of the moss Funaria hygrometrica Hedw. has been examined. Cyclic adenosine-3',5'-monophosphate (cAMP) and mono-and dibutyryl cAMP evoked the maximum resp...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00391574
更新日期:1979-01-01 00:00:00
abstract::Etiolated maize leaves (Zea mays L.) contain a major isozyme of NADP-dependent malic enzyme (L-malate dehydrogenase, decarboxylating, EC 1.1.1.40) having an isoelectric point of 5.28±0.03, a Km (L-malate) 0.3-0.6 mM at pH 7.45; a broad pH optimum around pH 6.9 under the conditions of assay; a molecular weight of 280,0...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388771
更新日期:1979-01-01 00:00:00
abstract::The binding of concanavalin A (con A) to leek (Allium porrum L.) stem protoplasts has been investigated using sequential treatment with con A and haemocyanin and using con A covalently linked to ferritin. Prefixed protoplasts were evenly labelled. Unfixed protoplasts showed a clustered distribution of label. Low tempe...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388761
更新日期:1979-01-01 00:00:00
abstract::Radioactive 2,000 g pellets (2KP) derived from lettuce (Lactuca sativa) hypocotyl sections incubated with [(3)H]gibberellin A1 ([(3)H]GA1) were subjected to a range of treatments to test the stability of labelling. The labelled association was stable in 0.1 M buffer at pH 3 and pH 9 and also in 1 M salt, organic solve...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387809
更新日期:1979-01-01 00:00:00
abstract::When fed with [(14)C] phenylalanine in the light, xylem tissues isolated from poplar stems were able to incorporate part of the radioactivity into both the guaiacyl and the syringyl residues of lignins. In the dark, only syringyl units were integrated into the polymer whereas the guaiacyl residues remained unlabeled.W...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387799
更新日期:1979-01-01 00:00:00
abstract::A study has been made of the wall fibrils produced by tobacco protoplasts, using scanning electron microscopy in conjunction with negative staining. It has been shown that the fibres seen in scanning electron microscopy correspond to aggregates of microfibrils. These aggregates are only visible where they are lifted c...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388233
更新日期:1979-01-01 00:00:00
abstract::We have shown the presence of abscisic acid (ABA) in abaxial epidermal strips taken from Tulipa gesneriana and Commelina communis and that the ABA level rises in the epidermis when leaves are water stressed. ABA levels had risen 50% in the abaxial epidermis of C. communis 30 min after the leaves lost 10% of their fres...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388223
更新日期:1979-01-01 00:00:00
abstract::(15)N-labelled nitrate was used to show that nitrate reduction by leaf discs in darkness was suppressed by oxygen, whereas nitrite present within the cell could be reduced under aerobic dark conditions. In other experiments, unlabelled nitrite, allowed to accumulate in the tissue during the dark anaerobic reduction of...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00381259
更新日期:1979-01-01 00:00:00
abstract::A study has been made of the changes occurring in Zea mays kernels exposed to thermal shock at the 48th h of soaking at 16°C, i.e., just before the protrusion of the root. Heat shock of 5 h at 46°C temporarily inhibits the resumption of root growth and consequently retards the protrusion of the root. On the ultrastruc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00381249
更新日期:1979-01-01 00:00:00
abstract::In the shoot apex of Selaginella kraussiana A. Br., air spaces develop between the endodermal cells, isolating the two steles from the cortex. The endodermal cells elongate to form trabeculae connecting the two tissues. As each trabecular cell develops, cuticularization occurs on the external surface at a point mid-wa...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380098
更新日期:1979-01-01 00:00:00
abstract::The electrochemical potential differences [Formula: see text] for potassium, between excised barley (Hordeum vulgare L.) roots and external media containing 0.05 mM KCl+0.5 mM CaSO4, were determined over a 4-h period during which initially low-K(+) roots accumulated K(+) by pretreatment in 50 mM KCl plus 0.5 mM CaCl2....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388368
更新日期:1979-01-01 00:00:00
abstract::A 5-methyltryptophan(5-MT)-resistant cell line of wild carrot (Daucus carota L.), W001, that exhibited auxin-independent callus growth, was found to accumulate indole-3-acetic acid (IAA) and tryptophan (trp). Anthranilate-synthetase activity in W001 cell extract was less sensitive to feedback inhibition by trp than in...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388358
更新日期:1979-01-01 00:00:00
abstract::Minor antigens characteristic of developing and mature embryos were not found in the shoot and root meristems of the seedlings. Some of these embryonal antigens (EA) were present, however, in callus and cell-suspension cultures, irrespective of their tissue origin, and were maintained throughout repeated subcultures, ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00454448
更新日期:1979-01-01 00:00:00
abstract::In plants of Silene coeli-rosa, induced to flower by 7 LD, synchronisation of cell division in 20 per cent or more of the cells in the shoot apical dome was found on the 8th and 9th days after the beginning of induction, during the plastochron before sepal initiation. Synchronisation was inferred from the changes in t...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00388711
更新日期:1979-01-01 00:00:00
abstract::Two isoenzymes each of glucosephosphate isomerase (EC 5.3.1.9), phosphoglucomutase (EC 2.7.5.1), glucose-6-phosphate dehydrogenase (EC 1.1.1.49) and 6-phosphogluconate dehydrogenase (EC 1.1.1.43) were separated by (NH4)2SO4 gradient solubilization and DEAE-cellulose ion-exchange chromatography from green leaves of the...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00379933
更新日期:1979-01-01 00:00:00
abstract::The potential for glycolate and glycine metabolism and the mechanism of refixation of photorespiratory CO2 in leaves of C4 plants were studied by parallel inhibitor experiments with thin leaf slices, different leaf cell types and isolated mitochondria of C3 and C4 Panicum species. CO2 evolution by leaf slices of P. bi...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00379923
更新日期:1979-01-01 00:00:00
abstract::Chloride ions are necessary to compensate for the positively charged potassium ions imported into guard cells of Allium cepa L. during stomatal opening. Therefore an external Cl(-) supply of intact Allium plants is important. But high levels of chloride have been found to reduce the sensitivity of the starch-lacking s...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385013
更新日期:1978-01-01 00:00:00
abstract::Terminal buds of Pinus silvestris L. containing microsporangiate strobilus primordia were collected once a month throughout the winter. The electron microscopic studies indicated that in October and December, the cells of the strobili contained a large number of vacuoles, a portion of which was supposedly autophagic, ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385003
更新日期:1978-01-01 00:00:00
abstract::Phytochrome was studied spectrophotometrically in Avena sativa L. seedlings that had been grown for 6 d in continous white fluorescent light from lamps. Greening was prevented through the use of the herbicide San 9789. When placed in the light, phytochrome (Ptot) decreased with first order kinetics (τ1/2 ≈ 2 h) but re...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392003
更新日期:1978-01-01 00:00:00