家禽屠体的堆肥     

Al Dam  Bill Groot Nibbelink  Daniel Ward 《中国家禽》2009,31(6)

加拿大安达略省家禽生产者对死禽处理通常有以下几种方法:选择经认证的死畜禽处理公司,坑埋,焚烧,堆肥.本文描述了使用堆肥法成功堆肥家禽屠体的一些关键因素. 堆肥是一个狭长的可被生物降解的有机物质堆,有很大的表面积以便氧气良好地渗透.堆肥通过需氧微生物分解生物有机物质制成一个稳定的、类似土壤的物质,称为腐殖质.为了刺激微生物快速降解,有必要给这些生长增殖的微生物提供最理想的环境.  相似文献   

CURRENT NOTES ON METEOROLOGY     

Ward RD 《Science (New York, N.Y.)》1896,4(94):562-564

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Multiple paternity,reproductive skew and correlates of male reproductive success in a wild population of the Trinidadian guppy     

Karen E. Elgee  Indar W. Ramnarine  Trevor E. Pitcher 《Ecology of Freshwater Fish》2012,21(1):109-118

Abstract – In most species, males have a higher reproductive potential than females, leading to skewed reproductive success, particularly in mating systems where pre‐ or postcopulatory sexual selection reinforces inequality in male mating success. We investigated multiple paternity, reproductive skew and correlates of male reproductive success in a wild population of the Trinidadian guppy (Poecilia reticulata). We used nine microsatellite loci to assess the frequency of multiple paternity, number of sires per brood and reproductive skew. Across broods, the frequency of multiple paternity was high with 94% of broods having multiple sires (range: 1–5), resulting in a reproductive skew of 0.14. Variation in male reproductive success was high (range: 0–14 offspring per male), suggesting that there is considerable opportunity for sexual selection. Next, we examined correlations between male reproductive success and sexual coloration, sperm velocity and gonopodium length. Relative area of orange, black, iridescent and total coloration, and sperm velocity were not correlated with reproductive success. However, gonopodium length explained 14% of the variation in reproductive success, suggesting that gonopodium length is likely a sexually selected trait. We discuss these findings in the light of other studies that genetically dissect joint‐sex parentage and examine correlates of male reproductive success in wild populations.  相似文献   

CURRENT NOTES ON METEOROLOGY     

Ward RD 《Science (New York, N.Y.)》1901,14(360):817-818

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CURRENT NOTES ON METEOROLOGY     

Ward RD 《Science (New York, N.Y.)》1900,12(288):37-38

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THE DUTY OF THE STATE IN THE PBOSECUTION OF MEDICAL RESEARCH     

Ward HB 《Science (New York, N.Y.)》1913,38(989):833-839

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CLIMATE AND CLIMATIC CHANGES IN KASHMIR     

Ward RD 《Science (New York, N.Y.)》1907,25(629):114-115

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CURRENT NOTES ON METEOROLOGY     

Ward RD 《Science (New York, N.Y.)》1904,19(490):801-802

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Climatology of Acacia mearnsii. 1. Characteristics of natural sites and exotic plantations     

Trevor H. Booth  Tom Jovanovic 《New Forests》1988,2(1):17-30

Climatic variation in the natural distribution of Acacia mearnsii in Australia was analysed. Data from sites where the species has been successfully grown in plantations and trials in Africa, Asia and South America were used to determine the species' climatic adaptability. Annual mean temperatures at these plantations and trial sites ranged from 13.9 to 23.9°C, whilst annual mean precipitation ranged from 693 to 2263 mm. The coldest month minimum temperature at these sites was –0.6°C. This information, along with other details of climatic requirements presented in the paper, will assist in selecting sites for future trials at new locations.  相似文献   

Lignin distribution across tracheid cell walls of poorly lignified wood from deformed copper deficient Pinus radiata (D. Don)     

G. M. Downes  J. V. Ward  N. D. Turvey 《Wood Science and Technology》1991,25(1):7-14

Summary Lignin topochemistry of tracheid walls from a deformed, copper deficient Pinus radiata (D. Don) tree was examined by linescan and point analyses using a Scanning Electron Microscope and Energy Dispersive Spectrometry. Both opposite and compression wood had abnormal lignin distributions compared to those observed in normal wood from a straight tree. Lignin contents in the compound middle lamella were lower than lignin contents in the secondary wall in both opposite and compression wood tracheids.One of us (G. D.) held a Commonwealth Forestry Postgraduate Research Award during this study. The research was supported in part by a grant from the Reserve Bank of Australia Rural Credits Development Fund, the Pine Fund, and members of the forest industry  相似文献