Triacontanol: a new naturally occurring plant growth regulator   总被引：1，自引：0，他引：1  

Ries SK  Wert V  Sweeley CC  Leavitt RA 《Science (New York, N.Y.)》1977,195(4284):1339-1341

Alfalfa meal and chloroform extracts of the meal have increased the growth and yield of several plant species. A crystalline substance isolated from the active fraction of alfalfa meal increased the dry weight and water uptake of rice seedlings when sprayed on the foliage or applied in nutrient culture. The substance was identified as triacontanol by mass spectrometry. Sprays containing this compound also increased the growth of corn, and barley grown in soil. Authentic triacontanol produced a similar response over a wide range of concentrations on rice grown in nutrient cultures and tomatoes grown in soil.  相似文献   

双季杂交稻耕作系统中养分与农药管理对土壤微生物活性的影响   总被引：3，自引：1，他引：3  

谢晓梅  廖敏  刘维屏  Susanne KLOSE 《中国水稻科学》2003,17(3):249-254

 田间实验表明在不同的管理方式和不同生长期所研究的土壤参数均发生显著变化。土壤微生物生物量/磷脂含量随水稻生长期延长而显著减少，同时，单独施用肥料或农药和同时施用肥料和农药均导致土壤微生物生物量/磷脂含量发生一定变化，单独施用农药的土壤中土壤微生物生物量/磷脂含量最低。异养型细菌和蛋白质分解菌数量随水稻生长期延长持续减少，单独施用农药的土壤中异养型细菌和蛋白质分解菌数量最少，异养型细菌和蛋白质分解菌数量的变化趋势与土壤微生物生物量/磷脂含量相似。电子运输系统/脱氢酶活度随水稻生长期延长持续增强。与对照相比，单独施用肥料或同施农药和肥料导致土壤中电子运输系统活度增强，而单独施用农药土壤中电子运输系统活度明显下降。单独施用肥料或农药及同时施用肥料和农药处理中，土壤中蛋白质含量相对稳定，但在不同生长期存在较大变化。关键词  相似文献   

Recombinant equine interferons: expression cloning and biological activity     

Steinbach F  Mauel S  Beier I 《Veterinary immunology and immunopathology》2002,84(1-2):83-95

  相似文献   

Stocktake study of current fertilisation recommendations across Europe and discussion towards a more harmonised approach     

Suzanne Higgins  Saskia D. Keesstra  Žydrė Kadziuliene  Lionel Jordan-Meille  David Wall  Alessandra Trinchera  Heide Spiegel  Taru Sandén  Andreas Baumgarten  Johannes L. Jensen  Juliane Hirte  Frank Liebisch  Susanne Klages  Philipp Löw  Katrin Kuka  Maarten De Boever  Karoline D'Haene  Sevinc Madenoglu  Hesna Özcan  Wieke Vervuurt  Janjo de Haan  Willem van Geel  Bo Stenberg  Pascal Denoroy  Rok Mihelič  Alar Astover  Raquel Mano  Cristina Sempiterno  Fatima Calouro  Giuseppe Valboa  Helena Aronsson  Tore Krogstad  Stanislav Torma  Jose Gabriel  Peter Laszlo  Nils Borchard  Bartosz Adamczyk  Anna Jacobs  Beata Jurga  Bożena Smreczak  Bruno Huyghebaert  Morgan Abras  Raimonds Kasparinskis  Eloise Mason  Claire Chenu 《European Journal of Soil Science》2023,74(5):e13422

The European Commission has set targets for a reduction in nutrient losses by at least 50% and a reduction in fertiliser use by at least 20% by 2030 while ensuring no deterioration in soil fertility. Within the mandate of the European Joint Programme EJP Soil ‘Towards climate-smart sustainable management of agricultural soils’, the objective of this study was to assess current fertilisation practices across Europe and discuss the potential for harmonisation of fertilisation methodologies as a strategy to reduce nutrient loss and overall fertiliser use. A stocktake study of current methods of delivering fertilisation advice took place across 23 European countries. The stocktake was in the form of a questionnaire, comprising 46 questions. Information was gathered on a large range of factors, including soil analysis methods, along with soil, crop and climatic factors taken into consideration within fertilisation calculations. The questionnaire was completed by experts, who are involved in compiling fertilisation recommendations within their country. Substantial differences exist in the content, format and delivery of fertilisation guidelines across Europe. The barriers, constraints and potential benefits of a harmonised approach to fertilisation across Europe are discussed. The general consensus from all participating countries was that harmonisation of fertilisation guidelines should be increased, but it was unclear in what format this could be achieved. Shared learning in the delivery and format of fertilisation guidelines and mechanisms to adhere to environmental legislation were viewed as being beneficial. However, it would be very difficult, if not impossible, to harmonise all soil test data and fertilisation methodologies at EU level due to diverse soil types and agro-ecosystem influences. Nevertheless, increased future collaboration, especially between neighbouring countries within the same environmental zone, was seen as potentially very beneficial. This study is unique in providing current detail on fertilisation practices across European countries in a side-by-side comparison. The gathered data can provide a baseline for the development of scientifically based EU policy targets for nutrient loss and soil fertility evaluation.  相似文献   

Safety and antioxidant activity of a pomegranate ellagitannin-enriched polyphenol dietary supplement in overweight individuals with increased waist size   总被引：2，自引：0，他引：2  

Heber D  Seeram NP  Wyatt H  Henning SM  Zhang Y  Ogden LG  Dreher M  Hill JO 《Journal of agricultural and food chemistry》2007,55(24):10050-10054

The consumption of pomegranate juice (PJ), a rich source of antioxidant polyphenols, has grown tremendously due to its reported health benefits. Pomegranate extracts, which incorporate the major antioxidants found in pomegranates, namely, ellagitannins, have been developed as botanical dietary supplements to provide an alternative convenient form for consuming the bioactive polyphenols found in PJ. Despite the commercial availability of pomegranate extract dietary supplements, there have been no studies evaluating their safety in human subjects. A pomegranate ellagitannin-enriched polyphenol extract (POMx) was prepared for dietary supplement use and evaluated in two pilot clinical studies. Study 1 was designed for safety assessment in 64 overweight individuals with increased waist size. The subjects consumed either one or two POMx capsules per day providing 710 mg (435 mg of gallic acid equivalents, GAEs) or 1420 mg (870 mg of GAEs) of extracts, respectively, and placebo (0 mg of GAEs). Safety laboratory determinations, including complete blood count (CBC), chemistry, and urinalysis, were made at each of three visits. Study 2 was designed for antioxidant activity assessment in 22 overweight subjects by administration of two POMx capsules per day providing 1000 mg (610 mg of GAEs) of extract versus baseline measurements. Measurement of antioxidant activity as evidenced by thiobarbituric acid reactive substances (TBARS) in plasma were measured before and after POMx supplementation. There was evidence of antioxidant activity through a significant reduction in TBARS linked with cardiovascular disease risk. There were no serious adverse events in any subject studied at either site. These studies demonstrate the safety of a pomegranate ellagitannin-enriched polyphenol dietary supplement in humans and provide evidence of antioxidant activity in humans.  相似文献   

Tentative Avenanthramide‐Modifying Enzyme in Oats     

Susanne Bryngelsson  Kerstin Sunnerheim  Carina Holm  Lena H. Dimberg 《Cereal Chemistry》2003,80(3):361-364

A decrease of the concentration of the synthetic avenanthramide N‐(4′‐hydroxy‐(E)‐cinnamoyl)‐5‐hydroxyanthranilic acid in a buffered slurry of milled oat groats (Avena sativa L.) was temperature and pH‐dependent, with a maximum rate at 30°C and pH 9. The reaction was inhibited in the presence of 2‐mercaptoethanol, acetic acid and at high temperature; suggestive of enzymatically catalyzed nature. Among eight different synthetic avenanthramides tested, the tentative enzyme had highest affinity for avenanthramides comprising caffeic and p‐coumaric acids and lowest for those comprising sinapic and ferulic acids. The activity was found in samples from several oat cultivars and was equally pronounced in both bran and endosperm flour of oats. Steeping of oat grains did not influence the reaction.  相似文献