Tissue respiration and body size     

VON BERTALANFFY L  PIROZYNSKI WJ 《Science (New York, N.Y.)》1951,113(2943):599-600

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Status of Sensitivity of Northern German Botrytis Populations to the New Sdhi Fungicide Fluopyram Prior to its Release as a Commercial Fungicide     

Weber  Roland WS  Entrop  Alfred-Peter  Goertz  Andreas  Mehl  Andreas 《植物病害和植物保护杂志》2015,122(2):81-90

Journal of Plant Diseases and Protection - In a survey of Botrytis populations in Northern Germany in 2012-2014, an average of 67.7% and 73.8% of isolates from strawberry and raspberry fields...  相似文献   

天然保鲜剂壳聚糖对白桃的保鲜效果   总被引：2，自引：0，他引：2  

徐根娣  李方  张淑娜  朱美红  吴韶辉 《贵州农业科学》2009,37(3)

为了探讨源东白桃的保鲜技术,以市售壳聚糖保鲜液为原料,进行了常温和4℃条件下源东白桃贮藏保鲜的研究.结果表明,市售壳聚糖保鲜液处理后的白桃失水率、腐烂率明显降低,能抑制可溶性固形物含量的增加,提高总糖的含量,可有效降低果实膜透性.表明,市售壳聚糖是一种安全、高效的天然保鲜剂,可作为常温下贮藏白桃的一种简单有效、安全的方法.  相似文献   

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   

Effects of supplemental dietary vitamin C on quality of semen from Nile tilapia (Oreochromis niloticus) breeders          下载免费PDF全文

NLAF Sarmento  EFF Martins  DC Costa  WS Silva  CC Mattioli  MR Luz  RK Luz 《Reproduction in domestic animals》2017,52(1):144-152

The objective of this study was to evaluate the effects of vitamin C on growth and quality of semen from Oreochromis niloticus breeders. One hundred and sixty males were fed with different levels of vitamin C (0, 261, 599 and 942 mg/kg diet). The higher weight values were recorded for 599 (166 g) and 942 (175 g) mg of vitamin C/kg diet. Sperm motility, vigour and concentration were higher with 599 and 942 mg of vitamin C/kg diet. The semen volume, gonadosomatic index and plasma protein data from the last week showed a direct relationship with increasing levels of vitamin C. No changes were observed in the hepatosomatic index and blood glucose. The haematocrit and erythrocyte showed higher values estimated by equations derived at 850 and 638 mg vitamin C/kg diet, respectively. The leucocytes were inversely proportional to the increasing levels of vitamin C. After 100 days of feeding, animals fed the diet containing 942 mg vitamin C/kg diet had higher sperm motility, linearity, curvilinear velocity, straight line velocity and average path velocity (p < .05). Higher values of beat cross‐frequency were observed in broodfish fed diets containing 942 and 599 mg vitamin C/kg. The different vitamin C levels did not cause differences in straightness, lateral head displacement and sperm morphology. For Nile tilapia males on intensive rearing and handling conditions, vitamin C levels between 599 and 942 mg/kg may be used for a better performance and quality of semen.  相似文献   

De waardplantenreeks van phomopsis dauci     

J. A. von Arx 《European journal of plant pathology / European Foundation for Plant Pathology》1954,60(1):72-73

Zusammenfassung Infektionsversuche haben ergeben, dassPhomopsis dauci von Arx scharf aufDaucus carota L. spezialisiert ist und andere Umbelliferen nicht antasten kann. Der Pilz kommt sowohl auf der Wildform wie auf den gezüchteten Rassen vonDaucus vor und geht leicht von der einen Form auf die andere über.  相似文献   

Een schimmelziekte op Achillea ptarmica L     

J. A. von Arx  W. P. de Leeuw 《European journal of plant pathology / European Foundation for Plant Pathology》1954,60(6):251-252

Zusammenfassung Auf der mehrjärigen ZierpflanzeAchillea ptarmica L. var.multiplex Heim Perry's White wurde in einigen Gärtnereien eine durch den AscomycetenSchizothyrioma ptarmicae (DC.) v.Höhn. verursachte Krankheit beobachtet. Der Pilz befällt die Stengel (Fig. 1), Blätter und Blüten (Fig. 2), wo zwischen Kutikula und Epidermis die bereits auf der lebenden Pflanze reifenden Ascusfrüchte (Fig. 3) angelegt werden. Die befallenen Pflanzen sterben nicht ab, bleiben aber in ihrem Wachstum zurück und werden unansehnlich. Verschleppung erfolgt wahrscheinlich durch Saatbefall. Der Pilz war bisher nur auf der wild wachsenden Form vonAchillea ptarmica bekannt.

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Mit Zusammenfassung: Eine Pilzkrankheit auf Achillea ptarmica L

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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