Ontogenetic movements of juvenile blacktip reef sharks: evidence of dispersal and connectivity between coastal habitats and coral reefs     

A Chin  MR Heupel  CA Simpfendorfer  AJ Tobin 《水产资源保护:海洋与淡水生态系统》2013,23(3):468-474

Relationships between soil and foliar nutrients in young densely planted mini-plots of Pinus radiata and Cupressus lusitanica     

Murray R. Davis  Graham Coker  Roger L. Parfitt  Robyn Simcock  Peter W. Clinton  Loretta G. Garrett  Michael S. Watt 《Forest Ecology and Management》2007,240(1-3):122-130

The long-term nature of forest crop rotations makes it difficult to determine impacts of forestry on soil nutrients that might be depleted by forest growth. We used small scale, highly stocked plots to compress the length of the rotation and rapidly induce nutrient depletion. In the study, two species (Pinus radiata D. Don and Cupressus lusitanica Miller) are compared under two disturbance regimes (soil undisturbed and compacted), and two fertiliser treatments (nil and plus fertiliser), applied in factorial combination at 33 sites, covering the range of climatic and edaphic variation found in plantation forests across New Zealand. To assess our ability to rapidly highlight important soil properties, foliar nutrient concentrations were determined 20 months after planting. It was hypothesised that the densely planted plots, even at a young age, would create sufficient pressure on nutrient resources to allow development of relationships between properties used as indicies of soil nutrient availability and foliar nutrient concentrations. For both species significant relationships between foliar nutrients and 0–10 cm layer soil properties from unfertilised plots were evident for N (total and mineralisable N) and P (total, acid extractable, organic, Bray-2 and Olsen P). With the exception of Ca in C. lusitanica, foliar K, Ca and Mg were correlated with their respective soil exchangeable cation measures. The results thus confirm the utility of the experimental approach and the relevance of the measured soil properties for forest productivity.

In unfertilised plots foliar N and P concentrations in P. radiata exceeded those in C. lusitanica, the differences being eliminated by fertiliser application. Foliar N/P ratios in P. radiata also exceeded those in C. lusitanica. In contrast to N and P, foliar K, Ca and Mg concentrations were all higher in C. lusitanica, the difference being particularly marked for Ca and Mg. P. radiata contained substantially higher concentrations of the metals Zn, Mn and Al than C. lusitanica, whereas the latter contained higher B concentrations. Possible reasons for differences between species in foliar nutrient concentrations are discussed.  相似文献   

REGARDING THE FUTURE OF THE GUANO INDUSTRY AND THE GUANO-PRODUCING BIRDS OF PERU     

Coker RE 《Science (New York, N.Y.)》1908,28(706):58-64

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Retracted: Effect of Post‐Thaw Storage Time on Motility and Fertility of Cryopreserved Beluga Sturgeon (Huso huso) Sperm          下载免费PDF全文

MS Aramli  RM Nazari  MR Gharibi 《Reproduction in domestic animals》2015,50(2):349-352

The aim of this study was to test the influence of post ‐ thaw storage time on the duration of sperm motility, percentage of motile sperm, and fertilization and hatching rates of fresh sperm and sperm stored for 0, 30 and 60 min at 4°C post‐thawing. After being frozen in liquid nitrogen and then thawed, the percentage of motile sperm and duration of motility were not affected by 30 min of storage at 4°C, whereas a significant decline in these parameters was observed after 60 min of storage. Similarly, fertilization and hatching rates were significantly affected within 60 min of storage at 4°C, and the fertility of frozen‐thawed sperm was significantly lower than that of fresh sperm. We conclude that cryopreserved sperm of beluga sturgeon could be stored for 30 min without the loss of sperm quality. This described procedure for beluga sturgeon cryopreservation is reliable and efficient and therefore can be recommended for hatchery practice after scaling up this technique.  相似文献   

The Influence of Morphology,Follicle Size and Bcl‐2 and Bax Transcripts on the Developmental Competence of Bovine Oocytes     

THC De Bem  PR Adona  FF Bressan  LG Mesquita  MR Chiaratti  FV Meirelles  CLV Leal 《Reproduction in domestic animals》2014,49(4):576-583

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Rhodococcus equi-associated osteomyelitis in foals     

EC FIRTH  MR ALLEY†  H HODGE 《Australian veterinary journal》1993,70(8):304-307

Two cases of Rhodococcus equl infection in foals are described, in which osteomyelitis was a feature. Because rhodococcal infection is usually low grade and chronic, and because the signs of early metaphysitis can be subtle, any articular or periarticular swelling in a foal from a farm with a history of rhodococcosis should be strongly suspected to be associated with R equl until proven otherwise.  相似文献   

Reply     

MR ALDERTON 《Australian veterinary journal》1993,70(11):429-430

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Synthesis, identification, and acute toxicity of alpha-benzylphenethylamine and alpha-benzyl-N-methylphenethylamine. Contaminants in clandestine preparation of amphetamine and methamphetamine     

F T Noggle  C R Clark  T W Davenport  S T Coker 《Journal of the Association of Official Analytical Chemists》1985,68(6):1213-1222

Amphetamine samples obtained from clandestine laboratories often contain other by-product amines. The most common of these are the alpha-benzylphenethylamine derivatives. This article reports the independent synthesis of reference samples of these amines, spectrophotometric and chromatographic methods for their identification, as well as acute toxicological studies. The utility of the analytical methods is demonstrated by the analysis of several amphetamine samples containing these alpha-benzylphenethylamines.  相似文献   

FILMY FERNS IN THE CAROLINAS     

Taylor MS  Coker WC 《Science (New York, N.Y.)》1938,88(2287):402

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CONSERVATION CONFERENCE ON RESOURCES OF INTERIOR WATERS     

Coker RE  Shelford VE  Krouse JE  Pearse AS  Stromster FA  Barney RL 《Science (New York, N.Y.)》1921,53(1374):406-407

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