Assessment of the influence of water management on yield component and morphological behavior of rice at post-heading stage

The use of water saving (WS) techniques in irrigated rice production is a key factor to increase and sustain rice production in water scarce regions. The purpose of the present study is to evaluate the influence of water management upon phenology, morphology, yield components, and the relationship with soil chemical properties. Pot experiments were carried out in greenhouse, on two different soil types “Typic Fluvaquent (GS) and Typic Paleudult (RS)”. In both soils, five treatments were conducted under continuous flooding “Control” (T1), flooding-drainage at 2, 3, and 4 weeks after heading (T2, T3, and T4) and field capacity (T5). In terms of morphological components or grain yield, GS showed better performance than RS, the high Mn availability in RS was responsible for the poor performance. However, regardless of soil type the establishment of WS period at post-heading did not affect significantly any of the evaluated parameters compared with Control. Shifting from anaerobic to aerobic condition at GS-T2 increased grain yield (8 %), biomass (12 %), and root biomass (16 %) as well as reduced grain sterility by 15 and 14 % for GS and RS, respectively. On soil properties, the WS period showed that, GS-Fe availability as well as RS-Mn availability were reduced by 54 and 22 %, respectively, to more optimal levels in response to changes in redox potential (Eh) and reduction of pH. The results indicated that establishment of WS period at post-heading stage is a suitable strategy not only for reducing water input but also to improve morphological behavior, to reduce sterility as well as to control Fe and Mn availability without negative effects on grain yield.     

雏鸡的饲养管理及疫病防制

育雏是雏鸡继续发育成熟所必经的阶段 ,也是养鸡业的成败关键环节 ;要保证相对较高的雏鸡育成活率 ,饲养管理和疫病防制是其关键性措施     

高粱产量及产量成分稳定性的通径分析

本文利用S.A.Eberhart等提出的“稳定性参数法”估计了1987年四川省高粱区试的6个品种(组合)的产量及产量成分的稳定性参数,并进行了产量及产量成分在稳定性反应“b”上的通径分析。结果表明:85-31、青壳洋高粱、矮马尾具有较好的丰产性和稳产性;在“S_d~2”较小时,产量稳定性主要与穗粒数的稳定性反应呈正相关,与千粒重的稳定性反应呈负相关,而穗粒数和千粒重表现一种互补关系。     

小豆的生长发育规律研究——Ⅱ、自然温光条件下小豆生长前期的反应

通过分期播种,研究小豆的生长前期在不同自然温光条件下的反应,并进一步揭示小豆的生物学规律。     

Inhibition of leishmanias but not host macrophages by the antitubulin herbicide trifluralin

The dinitroaniline herbicide trifluralin (alpha, alpha, alpha-trifluoro-2,6-dinitro-N, N-dipropyl-p-toluidine), at micromolar concentrations, selectively inhibited both proliferation and differentiation of the parasitic protozoan Leishmania mexicana amazonensis. In vitro, radioactive trifluralin showed specific binding to leishmania tubulin but not to mammalian tubulin. Because herbicides such as trifluralin are economical and are considered safe for man and domesticated animals, they may serve as useful sources of potential antiparasitic agents.     

Increased activity of calcium leak channels in myotubes of Duchenne human and mdx mouse origin

Elevated free Ca2+ concentrations found in adult dystrophic muscle fibers result in enhanced protein degradation. Since the difference in concentrations may reflect differences in entry, Ca2+ leak channels in cultures of normal and Duchenne human myotubes, and normal and mdx murine myotubes, have been identified and characterized. The open probability of leak channels is markedly increased in dystrophic myotubes. Other channel properties, such as mean open times, single channel conductance, ion selectivity, and behavior in the presence of pharmacological agents, were similar among myotube types. Compared to the Ca2+ concentrations in normal human and normal mouse myotubes, intracellular resting free Ca2+ concentrations ([Ca2+]i) in myotubes of Duchenne and mdx origin were significantly higher at a time when dystrophin is first expressed in normal tissue. Taken together, these findings suggest that the increased open probability of Ca2+ leak channels contributes to the elevated free intracellular Ca2+ concentration in Duchenne human and mdx mouse myotubes.     

Metallic and insulating oxide interfaces controlled by electronic correlations

The formation of two-dimensional electron gases (2DEGs) at complex oxide interfaces is directly influenced by the oxide electronic properties. We investigated how local electron correlations control the 2DEG by inserting a single atomic layer of a rare-earth oxide (RO) [(R is lanthanum (La), praseodymium (Pr), neodymium (Nd), samarium (Sm), or yttrium (Y)] into an epitaxial strontium titanate oxide (SrTiO(3)) matrix using pulsed-laser deposition with atomic layer control. We find that structures with La, Pr, and Nd ions result in conducting 2DEGs at the inserted layer, whereas the structures with Sm or Y ions are insulating. Our local spectroscopic and theoretical results indicate that the interfacial conductivity is dependent on electronic correlations that decay spatially into the SrTiO(3) matrix. Such correlation effects can lead to new functionalities in designed heterostructures.     

大豆蛋白水解物水解度测定的研究

利用茚三酮显色法及甲醛滴定法对大豆蛋白水解物的水解度进行测定并进行了结果比较，结果表明二法是一致的．蛋白质水解度的测定将为蛋白质酶水解程度的控制提供必要的方法．     

Deep Impact: observations from a worldwide Earth-based campaign

On 4 July 2005, many observatories around the world and in space observed the collision of Deep Impact with comet 9P/Tempel 1 or its aftermath. This was an unprecedented coordinated observational campaign. These data show that (i) there was new material after impact that was compositionally different from that seen before impact; (ii) the ratio of dust mass to gas mass in the ejecta was much larger than before impact; (iii) the new activity did not last more than a few days, and by 9 July the comet's behavior was indistinguishable from its pre-impact behavior; and (iv) there were interesting transient phenomena that may be correlated with cratering physics.     

Intermediate Filament Proteins Expression and Carbohydrate Moieties in Trophoblast and Decidual Cells of Mature Cat Placenta

The aim of this study was to characterize cytoskeletal intermediate filament proteins and glycoconjugates of syncytiotrophoblast, cytotrophoblast and decidual cells of feline endotheliochorial placenta. Samples from 12 normal pregnant female cats, after 45 ± 5 days of gestation, were obtained removing the uterine horns by hysterectomy. Sections were processed for routine observation and for immunohistochemistry using anticytokeratin, antivimentin and antidesmin antibodies. In addition, lectin histochemistry was performed using a panel of several biotinylated lectins to characterize glycosides expression profile. Cytotrophoblast and syncytiotrophoblast showed immunoreactivity only with acidic and basic cytokeratins. Decidual cells were only positive to vimentin, consistent with their origin from endometrial fibroblasts. Trophoblast expressed a broad population of glycans, highly exposing terminal N‐acetyl glucosamine residues and non‐sialylated galactose and N‐acetyl galactosamine oligomers. Oligosaccharides bound by Phaseolus vulgaris erythroagglutinin were the only highly branched N‐linked residues evidenced in cats, and they were restricted to the syncytium. Unlike results reported on humans, mice and rats on lectin affinity of decidual cells, sialid acids and complex N‐linked oligosaccharides were not demonstrated in cats. Glycosylation of proteins determines many of their final properties, thus becoming essential for the embryo‐maternal dialogue during implantation and placentation. Changes in glycosylation pattern have been related to pathological pregnancies in other species. Hence, the knowledge about glycosylation profile of the normal cat placenta may lead to a better understanding of both normal and pathological reproductive events.