Influence of nitrogen fertilization on yield and phenolic compounds in wheat grains (Triticum aestivum L. ssp. aestivum)     

Beate Stumpf  Feng Yan  Bernd Honermeier 《植物养料与土壤学杂志》2019,182(1):111-118

Nitrogen (N) is an important plant nutrient and is crucial for the plant growth and grain yield formation of field crops such as wheat (Triticum aestivum L. ssp. aestivum). However, little is known about the influence of N on secondary metabolites in wheat grains which are supposed to be beneficial for human health due to their antioxidant potentials. Therefore, we investigated the influence of N fertilization on plant growth and yield performance of winter wheat, as well as on total phenolic concentration, antioxidant capacity, and the accumulation of (in)soluble phenolic acids in wheat grains during the grain‐filling phase. It was found that ferulic acid was the predominant phenolic acid in wheat grains. As expected, higher amounts of N fertilizer led to increasing grain yields, whereas the concentration of soluble ferulic acid decreased. In contrast, insoluble bound ferulic acid, total phenolic content, and antioxidant capacity were not affected by the N treatment. Insoluble phenolic compounds seemed to be less susceptible to variations in N supply.  相似文献   

Dosage of drugs in the form of aerosols for inhalation use by poultry     

J Stumpf 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1969,16(1):81-90

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The haustorial interface in a resistant interaction of Erysiphe pisi with Pisum sativum     

M. A. Stumpf  J. L. Gay 《Physiological and Molecular Plant Pathology》1989,35(6)

The interface between Erysiphe pisi and pea cv. JI 1049 was studied at the ultrastructural and cytochemical levels and compared with those in two susceptible cultivars. Haustorial efficiencies, as indexed by the length of mycelium associated with each haustorium, and growth rates on the resistant and one susceptible cultivar were also compared.The interaction in the resistant cultivar differed from those in the susceptible cultivars in the following ways: (i) there was no contact between the host plasmalemma and the A neckband region; (ii) papillae were contiguous with the surface of the neck and thus were probably formed before haustoria and (iii) there appeared to be less polysaccharide in the extrahaustorial membrane. The extrahaustorial membrane in the resistant cultivar lacked ATPase activity, whereas the rest of the host plasmamembrane had normal activity.Each haustorium supported a significantly greater total hyphal length in the resistant than in the susceptible cultivars. Growth rates of superficial hyphae were very similar on the susceptible and resistant cultivars but there was a delay in the onset on hyphal growth on the resistant cultivar which correlated with the previously reported delay in formation of the first haustorium. In contrast to hyphal growth rates, the rate of haustorium production was significantly less in the resistant cultivar. It is proposed that resistance in cv. JI 1049 operates at the stages prior to haustorium formation, similarly to that in some non-host and partial resistance systems. Once formed, however, the function of the haustorium seems to be unimpaired, despite the observed interfacial differences.  相似文献   

Minipigs and potbellied pigs as pets in the veterinary practice--a retrospective study     

Sipos W  Schmoll F  Stumpf I 《Journal of veterinary medicine. A, Physiology, pathology, clinical medicine》2007,54(9):504-511

Minipigs have become popular pets in recent years. Therefore, an increasing number of veterinarians are being challenged by specific problems of these animals. This retrospective study gives an overview on the diagnoses and therapeutic interventions of the patients submitted to the clinic for swine at the University of Veterinary Medicine Vienna during the last 6 years (n=48). Most frequently, colic symptoms of the gastro-intestinal tract (n=12) and orthopaedic locomotion disorders (n=10), mainly due to accidents or long claws, could be observed, followed by urogenital tract and skin disorders (n=4 each). Therapeutic interventions are discussed with regard to medical aspects as well as statutory provisions.  相似文献   

    

Fr. Stumpf 《Forstwissenschaftliches Centralblatt》1930,52(24):941-951

Ohne Zusammenfassung  相似文献   

Bekanntmachung     

Dr. Stumpf 《European Journal of Forest Research》1870,14(1):200-200

Ohne Zusammenfassung  相似文献   

Circulating concentrations and pattern of luteinizing hormone and follicle-stimulating hormone in circulation are changed by the circulating concentration of 17 beta-estradiol in the bovine male and female.     

M W Wolfe  M S Roberson  T T Stumpf  R J Kittok  J E Kinder 《Journal of animal science》1992,70(1):248-253

The objectives of the present study were 1) to determine whether 17 beta-estradiol (E2) regulation of tonic secretion of LH and FSH is sexually differentiated in the bovine and 2) to evaluate the effects of various physiological concentrations of E2 on the profiles and concentrations of gonadotropins in circulation. This was accomplished by administering different numbers of implants containing E2 to gonadectomized bovine males and females. Mean age at initiation of the study was 18.5 mo. Animals received 1, 2, 4, 8, or 16 implants of E2 or a sham implantation. Mean concentrations of LH in circulation and amplitude of LH pulses were similar between males and females after administration of E2. There was a cubic response for mean concentrations of LH and amplitudes of LH pulses across the dosages of E2 administered; lower concentrations of E2 had little effect, whereas higher concentrations of E2 suppressed both mean LH and amplitude of LH pulses. A linear decline in frequency of LH pulses occurred as concentrations of E2 in circulation increased. A treatment x sex interaction resulted for mean concentrations of FSH in circulation. Low doses of E2 resulted in a greater enhancement of circulating concentrations of FSH in males than in females. Tonic secretion of LH in bovine males and females responded in a similar manner to administration of various physiological concentrations of E2; however, a differential response between sexes was observed for FSH.  相似文献   

Insecticidal activity and mode of action of novel nicotinoids synthesized by new acylpyridinium salt chemistry and directed lithiation     

Christof F. Stumpf  Thomas C. Sparks  R. Michael Roe 《Pesticide biochemistry and physiology》2007,87(3):211-219

Novel acylpyridinium salt chemistry and directed lithiation methodology was developed to add for the first time substitutions directly to the phenylpyridine heterocyclic ring of nicotine. A variety of 3-(1-methylpyrrolidin-2-yl)-4-(alkyl, aromatic, heterocyclic and silanyl) and -N-alkyl pyridines were synthesized (compounds 1-9). In vial tests with the green peach aphid, Myzus persicae, compounds 1-4 were 1.1, 1.8, 2.3 and 1.9×, respectively, more active than nicotine and 64, 40, 31 and 38×, respectively, less active than acetamiprid. Against the western flower thrips, Frankliniella occidentalis, 1-4 were 1.4, 2.1, 2.0 and 1.6×, respectively, more active than nicotine and 9, 6, 6 and 8×, respectively, less active than acetamiprid. For the cotton aphid, Aphis gossypii, the activity of 1-9 was similar to nicotine. Compounds 7 and 9 when incorporated into artificial diet produced low mortality for larvae of the beet armyworm, Spodoptera exigua, but were not active against the corn earworm, Helicoverpa zea. When 1-4 and 6-9 were injected into larvae of the beet armyworm, a variety of symptoms similar to acetamiprid were observed which included tremors, uncoordinated movement, diuresis, paralysis and death. In addition, imidacloprid-binding to membranes from the house fly head, Musca domestica, was inhibited by compounds 1-9, when using a concentration range of 1-100 μM. These studies demonstrate that our new chemistry enhances the insecticidal activity of nicotine with an apparent mode of action as an acetylcholine agonist.  相似文献   

Transgenic plants: effect on the third world     

Stumpf PK 《Science (New York, N.Y.)》1995,268(5219):1830-1831

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Radar systems     

Stumpf DK 《Science (New York, N.Y.)》1988,239(4840):543-544

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