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::Extracts from various parts of Phaseolus vulgaris L. var. Pinto plants were found to exhibit cytokinin activity with the highest levels present in extracts of the fruit tissue. To separate the cytokinins present in the fruit, extracts were chromatographed in several solvent systems. Bioassays of chromatograms indicate...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.3.320
更新日期:1971-09-01 00:00:00
abstract::Topped plants of tomato (Lycopersicon esculentum), cucumber (Cucumis sativus), corn (Zea mays), carrot (Daucus carota), and peanut (Arachis hypogaea) were treated with 0.5 to 50 micromolar Ni (containing (63)Ni) in nutrient solutions. Xylem exudate was collected for 10 hours or, in the case of corn, for 20 hours at 5-...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.3.273
更新日期:1971-09-01 00:00:00
abstract::Evidence is presented to support the suggestion that endogenous auxinlike substances participate in controlling the unbending of the hypocotyl hook of Phaseolus vulgaris L. (cv. Black Valentine). An acidic indole was detected in hook diffusates by fluorometry; triiodobenzoic acid, an inhibitor of auxin transport, prev...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.2.187
更新日期:1971-08-01 00:00:00
abstract::alpha-Amylase levels in intact seeds of barley (Hordeum vulgare L. cv. Himalaya) reach a maximum at 3 to 4 days of germination while gibberellin levels continue to increase beyond 6 days of germination. In contrast to its effect on half seeds, gibberellic acid does not increase the total amount of alpha-amylase produc...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.2.137
更新日期:1971-08-01 00:00:00
abstract::Irradiation of the gametophytes of Pteridium aquilinum with blue light led to a nearly 5-fold increase in the amino acid-incorporating activity of isolated chloroplasts. The blue light effect was not due to increased synthesis of ATP or other energy donors by the chloroplasts but was probably related to an increased p...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.1.82
更新日期:1971-07-01 00:00:00
abstract::Chromatin isolated from soybean (Glycine max L., var. Wayne) hypocotyls was capable of catalyzing the polymerization of labeled deoxyribonucleoside triphosphate in the presence of the three other deoxyribonucleoside triphosphates into a trichloroacetic acid-insoluble product. This product was insensitive to base hydro...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.1.43
更新日期:1971-07-01 00:00:00
abstract::Rhizobitoxine, an inhibitor of methionine biosynthesis in Salmonella typhimurium, inhibited ethylene production about 75% in light-grown sorghum seedlings and in senescent apple tissue. Ethylene production stimulated by indoleacetic acid and kinetin in sorghum was similarly inhibited. With both apple and sorghum, the ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.48.1.1
更新日期:1971-07-01 00:00:00
abstract::In order to characterize further the mechanical properties of coleoptile cell walls, stress relaxation measurements were made on methanol-boiled sections of Avena coleoptiles. Relaxation was measured both in mechanically conditioned specimens and in specimens which had not been previously extended. In both cases the r...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.6.812
更新日期:1971-06-01 00:00:00
abstract::The question of how rotation on a horizontal axis clinostat removes plants from the influence of the gravitational stimulus is answered. It is shown that appropriate horizontal axis clinostat rotation restricts the fall of intracellular particles to a quasi-circular path such that the position of the particle remains ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.6.756
更新日期:1971-06-01 00:00:00
abstract::This study concerns the selective absorption of K and Rb or of K and Na by intact sugar beet (Beta vulgaris) plants from modified conventional nutrient solutions over an extended period of plant growth. Long term results agreed with those of short term experiments by other investigators using excised root systems and ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.5.709
更新日期:1971-05-01 00:00:00
abstract::Ion and oxygen uptake were studied on aging bean stem slices. Oxygen uptake was high immediately after slicing, decreased to a minimum at 100 minutes, and then increased again. Ion uptake per unit of O(2) uptake data suggested that metabolic energy was utilized almost exclusively for sodium transport in fresh tissue b...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.5.663
更新日期:1971-05-01 00:00:00
abstract::Rootless soybean (Glycine max) seedlings were used as a test system to examine the action of auxin on chromatin-directed RNA synthesis. Chromatin from the basal tissue of rootless seedlings (both control and auxin-treated) had RNA synthetic capacity similar to that of chromatin from comparably treated intact seedlings...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.5.606
更新日期:1971-05-01 00:00:00
abstract::Substantial errors can be introduced to estimates of leaf resistance (r(l)) obtained from diffusion porometers unless precautions are taken to reduce the leaf-cup temperature difference (T(leaf) - T(cup)) to acceptable levels prior to measurement. When T(leaf) > T(cup), underestimation of leaf resistance occurs; the r...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.4.559
更新日期:1971-04-01 00:00:00
abstract::Indoleacetic acid-induced ethylene production and growth in excised segments of etiolated pea shoots (Pisum sativum L. var. Alaska) parallels the free indoleacetic acid level in the tissue which in turn depends upon the rate of indoleacetic acid conjugation and decarboxylation. Both ethylene synthesis and growth requi...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.4.504
更新日期:1971-04-01 00:00:00
abstract::The rate of (14)C-leucine and (3)H-uracil incorporation by tobacco cells (Nicotiana tabaccum var. Samsun N.N.) in suspension culture was simultaneously decreased by the addition of kinetin at concentrations above 2.5 x 10(-5)m. Ribosomal RNA was the first RNA species affected by kinetin. The purine derivatives, adenin...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.3.400
更新日期:1971-03-01 00:00:00
abstract::Compounds with planar triple ring systems such as acridine orange, 9-amino acridine, 9-amino-1,2,3,4-tetrahydroacridine (tacrine), 6,9-diamino-2-ethoxyacridine lactate monohydrate (DE-acridine), 6-chloro-9-(3'-diethylamino-2'-hydroxypropylamino) -2-methoxyacridine.2 HCl (CDM-acridine), quinacrine, 6-chloro-9-(4'-dieth...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.3.346
更新日期:1971-03-01 00:00:00
abstract::When air-dry urediospores of the wheat stem rust, Puccinia graminis f. sp. tritici, are exposed to temperatures below freezing, their germinability is markedly reduced, even after prolonged thawing at room temperature. Germinability is fully restored by a brief heat-shock or by vapor phase hydration. We have found tha...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.2.289
更新日期:1971-02-01 00:00:00
abstract::The separate package and spillover models of photosynthetic enhancement are generalized and extended to light saturation assuming hyperbolic or exponential rate versus intensity curves. The available data are more consistent with the exponential model at high light intensities. Two significant conclusions follow: (a) ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.2.222
更新日期:1971-02-01 00:00:00
abstract::Indoleacetic acid oxidase in tobacco callus tissues (Nicotiana tabacum L., cultivar White Gold) was resolved into seven anionic isoenzymes by polyacrylamide gel disc electrophoresis. Different concentrations of kinetin and zeatin in the presence of indoleacetic acid affected the level of this enzyme, particularly two ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.2.181
更新日期:1971-02-01 00:00:00
abstract::Hydroxamic acids, R-CONHOH, are inhibitors specific to the respiratory pathway through the alternate, cyanide-insensitive terminal oxidase of plant mitochondria. The nature of the R group in these compounds affects the concentration at which the hydroxamic acids are effective, but it appears that all hydroxamic acids ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.1.124
更新日期:1971-01-01 00:00:00
abstract::Rhythmic rotational movements with the midvein as the axis have been observed in the unifoliate leaves of Phaseolus angularis Wight grown under controlled environmental conditions with continuous light. The mean period of this movement for all leaves was 53.2 +/- 4.3 minutes and remained constant as the leaf matured, ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.1.68
更新日期:1971-01-01 00:00:00
abstract::Amitrole (3-amino-s-triazole), dichlormate (3,4-dichlorobenzyl methylcarbamate), and pyriclor (2,3,5-trichloro-4-pyridinol) inhibited normal carotenogenesis in etiolated wheat (Triticum aestivum L. var. Coker 65-20) seedlings. Carotenoid precursors accumulated in treated plants. In dichlormate-treated plants, zeta-car...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.47.1.144
更新日期:1971-01-01 00:00:00
abstract::Nitrate reductase activity was induced by nitrate in green corn (Zea mays) leaves in either light or darkness. The induction process required oxygen in darkness but not in light. A light treatment was required before the enzyme could be induced in etiolated leaves.The capacity for nitrate reductase induction by nitrat...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.6.800
更新日期:1970-12-01 00:00:00
abstract::The isolation of chloroplast and nuclear DNA from dark- and light-grown, control- and 3-amino-1,2,4-triazole-treated wheat seedlings, Triticum vulgare, is described. Contrary to a previous report, we found that chloroplast and nuclear DNA had similar buoyant densities (1.702 grams per cubic centimeter) and that they c...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.6.825
更新日期:1970-12-01 00:00:00
abstract::Rice grains (Oryza sativa L.) from three varieties and three pairs of lines with different protein content were collected at 4-day intervals from 4 to 32 days after flowering. The samples were analyzed for protein, free amino nitrogen, ribonucleic acid, protease activity, and ribonuclease activity. In addition, the ca...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.5.743
更新日期:1970-11-01 00:00:00
abstract::Light induces beta-carotene synthesis in streptomycin-bleached Euglena gracilis Z. Light-adapted, chemostat-grown cells have up to 10-fold as much beta-carotene and 25% more protein than similarly grown, dark-adapted cells. Carotenogenesis does not occur under anaerobic conditions or in the presence of diphenylamine, ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.5.685
更新日期:1970-11-01 00:00:00
abstract::The presence of multiple forms of alpha-amylase in gibberellic acid-treated embryoless barley half-seeds was demonstrated by separation on diethylaminoethyl-Sephadex and isoelectric focusing polyacrylamide gel disc electrophoresis. Two major alpha-amylase fractions (A and B), each consisting of two to three isozyme co...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.4.586
更新日期:1970-10-01 00:00:00
abstract::Two inhibitory fractions (B(1) and C) from extracts of immature fruit of carob were tested for their ability to inhibit the action of indoleacetic acid (IAA) in three bioassays. There was no reduction of IAA-induced reactions in the Avena curvature test, abscission of debladed coleus petioles, or growth of cucumber hy...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.4.531
更新日期:1970-10-01 00:00:00
abstract::Stomata in epidermal strips of Vicia faba opened in light and closed in darkness when floated on dilute K(+) solutions. Opening and closing, respectively, paralleled the fluxes of labeled K(+) into and out of the strips. The gain and loss of K(+) by the strips were shown by colbaltinitrite stain to be centered at guar...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.3.483
更新日期:1970-09-01 00:00:00
abstract::The levels of starch, soluble sugars, protein, and enzymes involved in starch metabolism-alpha-amylase, beta-amylase, phosphorylase, Q-enzyme, R-enzyme, and starch synthetase -were assayed in dehulled developing rice grains (Oryzasativa L., variety IR8). Phosphorylase, Q-enzyme, and R-enzyme had peak activities 10 day...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.3.429
更新日期:1970-09-01 00:00:00
abstract::The wilty tomato mutant, flacca, and the control variety, Rheinlands Ruhm, were compared with regard to the endogenous activity and concentration of auxin- and abscisic acid-like substances during ontogeny. The mutant wilts fast under water deficit because of inability to close its stomata. Symptoms characteristic of ...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.3.373
更新日期:1970-09-01 00:00:00
abstract::No cytokinin activity was found in methanolic mesocarp extracts after purification with petroleum ether and ethyl acetate. Cytokinin activity did appear, however, in aqueous fraction after acid hydrolysis or passage through Dowex 50 (H(+)) ion exchange columns. The level of this activity, the fruit growth rate, and th...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.2.334
更新日期:1970-08-01 00:00:00
abstract::Sucrose gradient profiles of polyribosomes from the coleoptilar node region of seedlings of Zea mays L. were obtained without pelleting and redispersion of the particles. Water stress caused a shift of ribosomes from the polymeric to the monomeric form, starting about 30 minutes after stress initiation and when the wa...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.2.281
更新日期:1970-08-01 00:00:00
abstract::Although cycloheximide is extremely inhibitory to protein synthesis in vivo in higher plants, the reported insensitivity of some plant ribosomes suggests that it may not invariably act at the ribosomal level. This suggestion is reinforced by results obtained with red beet storage tissue disks, the respiration of which...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.2.227
更新日期:1970-08-01 00:00:00
abstract::Addition of excess copper to nongrowing cells of a normal, green Chlorella caused a reduction in total pigments and a blue shift of chlorophyll absorption, concurrent with the inhibition of photosynthesis. Chlorophylless yellow and white mutant strains of the same alga showed a rise in nonspecific absorption (i.e., ch...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.2.183
更新日期:1970-08-01 00:00:00
abstract::Magnesium-28 was applied to specific leaves of bean (Phaseolus vulgaris) and barley (Hordeum vulgare) plants. After 24 hours, as much as 7% of the absorbed Mg was exported from the treated bean leaves and 11% was transported basipetally from the treated zone of the barley leaves. Transport of Mg did not occur past a h...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.1.50
更新日期:1970-07-01 00:00:00
abstract::Light- and oxygen-induced changes of cytochromes f, b(563), and b(559) and ferredoxin-flavoprotein were studied by a double beam spectrophotometer with combinations of inhibitors and lowered temperatures in the whole cells of the pale green mutant of Chlamydomonas reinhardi (ATCC 18302). At room temperature, the stead...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.1.163
更新日期:1970-07-01 00:00:00
abstract::Logarithmic growth rates (either fresh or dry weight basis) of tobacco callus tissues grown on 10(-4) to 10(-1) mum cytokinin are increased if gibberellic acid (10(-3)-2 mum) is incorporated into the medium. At higher (1-10 mum) cytokinin concentrations gibberellic acid has little effect on growth rate but extends the...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.46.1.113
更新日期:1970-07-01 00:00:00
abstract::A number of parameters associated with the isolation of plant mitochondria were carefully examined in the hope of optimizing the isolation technique. Dark-grown mung bean (Phaseolus aureus var. Jumbo) hypocotyls were used as the source of mitochondria. Necessary conditions for the isolation of tightly coupled plant mi...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.45.6.773
更新日期:1970-06-01 00:00:00
abstract::The activity of the enzyme responsible for the synthesis of cytidine diphosphate diglyceride has been found in the 20,000g pellet of a cauliflower (Brassica oleracea) inflorescence homogenate. Greater enzyme activity was found in the pellet after treatment with 0.02% Triton X-100, or after freezing and thawing. Activi...
journal_title:Plant physiology
pub_type: 杂志文章
doi:10.1104/pp.45.6.719
更新日期:1970-06-01 00:00:00