Experimental liming of watersheds: an international cooperative effort between the United States and West Germany     

Robert W. Brocksen  Heinz W. Zoettl  Donald B. Porcella  Reinhard F. Huettl  Karl-Heinz Feger  Joe Wisniewski 《Water, air, and soil pollution》1988,41(1-4):455-471

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Einfluß der Fließstreckenlänge auf die Bodenumlagerung innerhalb einer erosionsgeschützten Kleinparzelle     

Heinz Peter Schrey 《植物养料与土壤学杂志》1987,150(4):235-240

Dependence of erosion from flow length within an erosion-protected plot On an Udalf derived from loess different micro-reliefs were formed to reduce erosion. Their effects on the spatial distribution of sand contents on bare soil after one vegetation period are described. At first erosion caused residuals of sand on unflooded areas and corresponding accumulation of finest material on flooded ones. Beds without flow barriers showed reduced clay and silt contents in the upper layer of about 2 mm. On beds with small dams there were no soil losses from the catchment areas between these flow barriers visible. Secondly the enriched sand was moved, too. This occured widely on flat beds. Within catchment areas there were only very small deposits of removed sand in front of the dams. In conclusion: Within the limits of a chosen risk, artificial microreliefs reduce completely erosion damages.  相似文献   

Spatial distribution of earthworms [Lumbricidae] in recultivated soils of the Rhenish lignite‐mining area,Germany     

Heinz‐Christian Fründ  Ellen Egbert  Gerhard Dumbeck 《植物养料与土壤学杂志》2004,167(4):494-502

The spatial distribution of earthworms was studied by means of combined formalin expulsion and hand sorting in three arable fields of the Rhenish lignite‐mining area that differed in their recultivation age (6, 12, 24 yr). In addition, pH and the spatial distribution of penetration resistances were measured to see if they are corresponding with the distribution of earthworms. Already the 6 yr old field had a rich population of endogeic, anecic, and epigeic earthworms (119 ind. m^–2, 48 g m^–2, 6 species). This quantity was similar to the 24 yr old site. The 12 yr old field was only sparsely populated by earthworms (5 ind. m^–2, 5 g m^–2, 3 species). In the 6 yr old field, the spatial distribution pattern showed a center of maximal earthworm abundances, corresponding to the distributional pattern of penetration resistances. In the old field (24 yr), the species varied in their spatial distribution, and there was no correspondence with the distribution of penetration resistance. In general, the penetration resistance at the youngest site was clearly lower than at the two older sites. The earthworm population in the 6 yr old field can be explained by cocoons contained in the dumped material. A calculation using literature data on earthworm‐population dynamics shows that a founding population of 400–600 reproductive individuals per hectare and a continuity of favorable growth conditions during the time of soil management is necessary for the development of the situation found at the 6 yr old site in this study.  相似文献   

Fenbendazole. I. Structure-activity relationships     

Heinz Loewe  Josef Urbanietz 《Pest management science》1977,8(5):544-549

Substitution of alkyl benzimidazol-2-ylcarbamates by phenoxy- or phenylthio-groups in the 5-position results in an increase in anthelmintic activity. The biological spectrum is altered by substitution of the phenyl ring. A sulphonic ester substituent in the 5-position of the benzimidazole nucleus also increases anthelmintic activity.  相似文献   

Art- und Gattungsgrenzen bei höheren Discomyceten,II     

Erich Heinz Benedix 《Genetic Resources and Crop Evolution》1966,14(1):359-379

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Influence of mechanical and thermal treatment of animal feed on the true digestibility of amino acids. 2. True digestibility of amino acids in treated horse beans]     

H Meier  T Heinz  S Poppe 《Archives of Animal Nutrition》1975,25(5):359-364

Trials were performed to investigate in which way mechanical and/or thermal treatment of horse beans would have an effect on the harmful components that were shown to be present in horse beans. In the course of these trials amino acids from heat-treated horse beans (variety Fribo) were analyzed for their true digestibility. Apart from heat-treated horse beans the investigation included undecorticated and decorticated beans and a mixture of horse beans with spring barley.  相似文献   

Influence of thermal and mechanical treatment of animal feed on the true digestibility of amino acids. 1. True digestibility of amino acids in soy bean meals treated by varying heat]     

T Heinz  S Poppe 《Archives of Animal Nutrition》1975,25(5):353-358

Thermal treatment inactivates harmful components in some feedingstuffs such as extracted soy bean meal. The true digestibility of amino acids from untreated and heat-treated extracted soya bean meal had been determined in order to investigate the great variety of ways in which thermal treatment might affect food proteins, e.g. in producing a decomposition of inhibitors or damaging the amino acids. The trials were carried out with young pigs.  相似文献   

Fenvalerate residues in milk following topical treatments to dairy cows     

Richard Frank  Heinz E. Braun  Lloyd A. Miller  George W. Allan 《Pest management science》1984,15(6):600-604

Two mature Holstein cows were treated with 0.1g of fenvalerate each, in six consecutive topical treatments at intervals of 3 or 4 days. Neither of the diastereoisomers of fenvalerate was detected in the milk 6h after the application. After 3 days, the mean fenvalerate residue was 0.46μg litre⁻¹; by day 4, this residue had declined below the detection limit of 0.1μg litre⁻¹ for each of the diastereoisomers. Two Holstein cows were also treated with 0.5g of fenvalerate per cow in three consecutive topical treatments at intervals of 14 days. Residues in whole milk were at a maximum 6h after treatment and declined to less than 0.2μg litre⁻¹ over 21 days. Only 0.03 to 0.06% of the applied fenvalerate appeared in the milk as the intact insecticide.  相似文献   

Histomorphologic and morphometric evaluation of the uterine horns in nulliparous and multiparous Beagles     

Augsburger HR  Kürzi M 《American journal of veterinary research》2004,65(5):552-558

OBJECTIVE: To macroscopically, histomorphologically, and morphometrically compare uterine tissues obtained from nulliparous and multiparous dogs. ANIMALS: 12 dogs constituting 2 homogenous groups (7 nulliparous Beagles and 5 multiparous Beagles, each of which had at least 7 pregnancies). PROCEDURE: Serum concentrations of progesterone and estradiol-17beta were determined. Samples of uterine tissues were fixed, embedded in paraffin, and cut into serial cross sections. Morphometric analysis was performed on systematically selected trichrome-stained sections. RESULTS: Mean absolute volume of the uterine wall did not differ between groups. Volume of blood vessels was significantly higher and relative mean value for myometrial connective tissue was significantly lower in the multiparous dogs. Arteries in the myometrium of multiparous dogs had pronounced thickening of the intima (ie, pregnancy sclerosis) and a concomitant thinning of the smooth muscle layer (tunica media). Furthermore, the elastica interna of these arteries appeared to be disintegrating and was highly and irregularly folded. Adventitia of the myometrial veins in multiparous dogs contained numerous layers of elastic fibers; however, only a few layers were observed in the adventitia of corresponding veins in nulliparous dogs. CONCLUSIONS AND CLINICAL RELEVANCE: In this study, we documented that in contrast to other species, the uterus of nonpregnant dogs does not increase in size and volume even after at least 7 pregnancies. Furthermore, sclerotic alterations of uterine arteries are proof of at least 1 pregnancy. Results of this study may be useful in the evaluation of uterine diseases.  相似文献   

Optical spectroscopy of individual single-walled carbon nanotubes of defined chiral structure     

Sfeir MY  Beetz T  Wang F  Huang L  Huang XM  Huang M  Hone J  O'Brien S  Misewich JA  Heinz TF  Wu L  Zhu Y  Brus LE 《Science (New York, N.Y.)》2006,312(5773):554-556

We simultaneously determined the physical structure and optical transition energies of individual single-walled carbon nanotubes by combining electron diffraction with Rayleigh scattering spectroscopy. These results test fundamental features of the excited electronic states of carbon nanotubes. We directly verified the systematic changes in transition energies of semiconducting nanotubes as a function of their chirality and observed predicted energy splittings of optical transitions in metallic nanotubes.  相似文献