Antibiotic abuse and medicated feed     

R VON Wattenwyl  R Wattenwyl 《Schweizer Archiv für Tierheilkunde》1969,111(5):282-291

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The relationship between the prevalence of uterine lesions and the use of medroxyprogesterone acetate for canine population control     

AG VON BERKY  WL TOWNSEND† 《Australian veterinary journal》1993,70(7):249-250

SUMMARY The prevalence of uterine disease was established during desexing of 175 bitches in the Torres Strait and Cape York, 42 of which had been treated with injectable medroxyprogesterone acetate (MPA) for oestrus postponement. The prevalence of uterine lesions was 45% for treated bitches, 5% for untreated bitches, and 14.9% for the sample population. A highly significant relationship (P<0.01) between MPA treatment and uterine lesions was established. A significant association (P<0.05) between age (>2 years old) and uterine lesions was found, most likely attributable to a significantly higher proportion (P<0.01) of MPA-treated bitches in the older population. There was no significant difference in the effect of MPA on the prevalence of uterine lesions between older and younger bitches. There was no effect of parity on the prevalence of uterine lesions.  相似文献   

Use of acridine-orange fluorescence technique in exfoliative cytology     

MASIN F  MASIN M  VON BERTALANFFY L 《Science (New York, N.Y.)》1956,124(3230):1024-1025

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Depth Distributions of Belowground Production, Biomass and Decomposition in Restored Tallgrass Prairie     

Adam C. VON HADEN  Mathew E. DORNBUSH 《土壤圈》2019,29(4):457-467

Grasslands store large stocks of soil organic carbon(SOC) in the subsoil, but our knowledge of belowground processes becomes less robust with depth. Vertically explicit SOC models typically assume that the depth distribution of belowground production follows the depth distribution of belowground biomass, but this assumption has not been tested. In addition to the effects of soil temperature and moisture on decomposition, some vertically explicit SOC models implement an intrinsic decrease in belowground decomposition with depth, yet this effect has rarely been observed empirically. We simultaneously measured the depth distributions of belowground biomass, production, and litter decomposition to assess whether belowground biomass depth distributions were suitable predictors of belowground production and whether belowground decomposition decreased with soil profile depth. We found that live and total(live +dead) belowground biomass was distributed relatively more shallowly than total belowground production, and thus total belowground biomass was a biased predictor of the vertical distribution of belowground production. The depth distribution of live roots 2 mm in diameter was found to be the best predictor of total belowground production depth distribution. Using an intact decay core method,we found that belowground litter decomposition decreased by 49% from 0–10 to 30–40 cm depth, and model-simulated effects of soil temperature and moisture accounted for only 9% of the observed decrease with depth. Vertically explicit SOC models can be improved with more accurate empirical belowground production depth distribution estimates, but depth-specific decomposition rates currently implemented in SOC models are necessary to explain observed decreases in belowground litter decay with depth.  相似文献   

Marek'sche Hühnerlähmung: Reaktionen im experimentell infizierten embryonierten Ei     

V. VON Bülow 《Zoonoses and public health》1969,16(2):97-114

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Das Zusammenwirken der mineralischen Düngung mit verschiedenen Formen der organischen Düngung     

E. VON  Boguslawski 《Journal of Agronomy and Crop Science》1995,174(1):41-51

The combined effect of fertilizing with different forms of organic fertilizer
The' IOSDV field experiment, testing mineral-nitrogen fertilizer in combination with different forms of organic manure over a period of 6 years (two crop-rotation cycles) has provided specific results concerning the interaction of the components of fertilizers. Stable manure had an intensive effect on sugar beet but only a weak effect on winter wheat. Sugar-beet leaves had a strong effect on winter wheat but little effect on winter barley. Straw -green manure showed a growing effect on winter barley. As expected, the effect of fertilizing is influenced by climatic factors. Yield curves with the specific parameters 'M', 'm' and 'i' show – as would be expected – that the effect of the organic manure on yield is chiefly expressed at lower levels of mineral-nitrogen manure. In this way, the curves indicate the optimal level of N-fertilization. The balance of nutrients show that organic variances have different effects on the N-balance. The interval evaluation shows the importance of long-term experiments.  相似文献   

Leptin as an indicator for carcass composition in farm animals     

Monika ALTMANN  Eberhard VON BORELL 《Animal Science Journal》2007,78(5):449-459

The function of leptin in livestock species has been intensively studied during recent years. Due to the associations between plasma leptin concentrations and body fat, leptin could be used as an indicator for the in vivo evaluation of carcass composition in breeding programs. This review specifically discusses leptin mRNA expression in several fat tissues, the relationship between plasma leptin and body fat and the influence of fasting on this association. It also refers to the limitations of the use of plasma leptin concentrations as a predictor for selection purposes in breeding animals. Furthermore, single nucleotide polymorphisms in the leptin gene have some effects on carcass traits and the leptin gene is considered to be a candidate gene for a marker‐assisted selection. However, these results are very inconsistent across various populations and need to be confirmed in future studies before leptin can be used efficiently in breeding programs and management.  相似文献   

Rapid Aerial Survey of Gulf Stream with Camera and Radiation Thermometer     

Stommel H  VON Arx WS  Parson D  Richardson WS 《Science (New York, N.Y.)》1953,117(3049):639-640

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Current status of theories of hearing     

VON BEKESY G 《Science (New York, N.Y.)》1956,123(3201):779-783

In summing up the current status of the hearing theories, it may be said that each of the vibration patterns of the basilar membrane postulated by the four major theories of hearing can be obtained by varying two elastic properties of the membrane-namely, the coupling between adjacent parts and the absolute value of the elasticity. If these two variables are adjusted to their numerical values in the cochlea of a living animal or a fresh preparation of the human ear, traveling waves are observed along the membrane. These traveling waves have a flat maximum that shifts its location along the membrane with a change of frequency-the place of the maximum determining the pitch. An enlarged dimensional model of the cochlea in which the nerve supply of the sensory organs on the basilar membrane was replaced by the skin of the arm indicates that the inhibitory action in the nervous system can produce quite sharp local sensations, which shift their place with changes in the frequency of the vibrations.  相似文献   

The international cometary explorer mission to comet giacobini-zinner     

VON Rosenvinge TT  Brandt JC  Farquhar RW 《Science (New York, N.Y.)》1986,232(4748):353-356

The International Cometary Explorer (ICE) became the first spacecraft ever to encounter a comet when it passed through the tail of comet Giacobini-Zinner. An overview of this encounter is presented, including highlights of the results.  相似文献