Photosynthetic Marine Mollusks: In vivo 14C Incorporation into Metabolites of the Sacoglossan Placobranchus ocellatus     

Ireland C  Scheuer PJ 《Science (New York, N.Y.)》1979,205(4409):922-923

In seawater enriched with carbon-14-labeled sodium hydrogen carbonate the sacoglossan Placobranchus ocellatus when exposed to light incorporates carbon-14 at a rate 50-fold of that for animals kept in the dark. 9,10-Deoxytridachione, a secondary metabolite of the mollusk, undergoes a photorearrangement to photodeoxytridachione in vivo.  相似文献   

The intensity of resistance by mature Merino ewes against Haemonchus contortus and Tichostrongylus colubriformis in single-species and combined-species infection     

DB ADAMS  JJ LYNCH†  BH ANDERSON  LR FELL‡  GN HINCH§  RK MUNRO¶ 《Australian veterinary journal》1990,67(12):443-445

Three-year-old, non-lactating and non-pregnant Merino ewes, raised on pasture under a program of strategic treatment with anthelmintic and found to be extremely resistant to "trickle" infection with Haemonchus contortus, were given single-dose infections with either H. contortus or Trichostrongylus colubriformis or both species together. The purpose was to ascertain the intensity of protective immunity against the 2 parasites in sheep with immunity acquired from a presumably slight exposure to infection. To provide a criterion, some infected ewes were immunosuppressed with corticosteroid, dexamethasone. Untreated ewes were extremely resistant to challenge infection with either 15,000 or 150,000 H. contortus or 15,000 T. colubriformis. Surprisingly, when mixed infection was given, egg counts for H. contortus were significantly elevated compared with infection by that species alone. Antibody to antigens from infective larval and adult H. contortus was measured in serum by enzyme-linked-immunosorbent assay (ELISA) during the course of infection. Serum titres against larval antigens were significantly depressed when infections with either H. contortus or T. colubriformis were permitted by immunosuppression with dexamethasone, whereas those against adult antigen were depressed when infection with T. colubriformis was permitted.  相似文献   

A preliminary investigation of the effect of sample collection technique on the cell and RNA content of fine‐needle aspirates of five canine tumours          下载免费PDF全文

K. L. Bowlt Blacklock  J. Ireland  J. Stewart  S. Murphy  L. Blackwood  M. Starkey 《The Journal of small animal practice》2018,59(4):211-221

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Seroprevalence and factors associated with seropositivity to equine arteritis virus in Spanish Purebred horses in Spain          下载免费PDF全文

F. Cruz  P. Fores  L. Mughini‐Gras  J. Ireland  M. A. Moreno  R. Newton 《Equine veterinary journal》2016,48(5):573-577

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The centrodistal joint interosseous ligament region in the tarsus of the horse: Normal appearance,abnormalities and possible association with other tarsal lesions,including osteoarthritis          下载免费PDF全文

E. Skelly‐Smith  J. Ireland  S. Dyson 《Equine veterinary journal》2016,48(4):457-465

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A logistic analysis of the factors determining the decision of smallholder farmers to intercrop: A case study involving rubber–tea intercropping in Sri Lanka     

S.M.M. Iqbal  C.R. Ireland  V.H.L. Rodrigo 《Agricultural Systems》2006

The factors influencing the decision of smallholder farmers to adopt new farming technologies were studied with reference to rubber–tea intercropping in Sri Lanka. Rubber–tea intercropping has been recommended previously to rubber farmers as a means to improve productivity and income during the early pre-tapping phase of rubber growth. Although crop trials have shown that the two crops are agronomically compatible and potentially produce a combined economic yield superior to the yield of a sole crop grown on the same area of land, there is little evidence of widespread adoption of this practice among smallholder farmers in Sri Lanka. The aim of the study was to determine the major factors that influence the decision to undertake rubber–tea intercropping and to construct a predictive model that describes the likelihood of adoption of intercropping by traditional smallholder rubber growers. A rapid rural appraisal (RRA) was undertaken based on semi-structured interviews of 90 smallholder farmers in the main rubber growing low wet zone of Sri Lanka. Among a number of factors shown to significantly influence the decision to intercrop tea with rubber, three were shown to operate independently, namely level of income, source of income (i.e. solely from own farm or from farm plus additional off-farm enterprises), and availability of land considered suitable for tea cultivation. A statistical model developed through correlation and logistic analysis, which predicts the likelihood of a smallholder adopting intercropping based on these factors, is presented and discussed. The most likely combination of circumstances (82% probability) under which rubber–tea intercropping is practiced is shown to be where the farmer’s income is greater than Rs. 10,000 per month, where the farmer’s income is based solely on own farm enterprises, and where more than 80% of the farmer’s land area was judged to be suitable for tea cultivation. Conversely, 30% of smallholder farmers that chose not to intercrop did possess land suitable for tea cultivation. Qualitative responses to the RRA indicated that limitation of technical knowledge was the main problem subsequently faced by rubber farmers who had adopted rubber–tea intercropping. Results indicate that there is need for both income support through farm subsidies and further agricultural extension services, if rubber–tea intercropping is to be adopted more widely in Sri Lanka. The wider usefulness of the developed logistic model in determining the likelihood of adoption of intercropping by smallholder farmers is discussed.  相似文献   

Mechanisms behind soil N dynamics following cover restoration in degraded land in subtropical China     

Zheng  Xiangzhou  Lin  Cheng  Guo  Baoling  Yu  Juhua  Ding  Hong  Peng  Shaoyun  Zhang  Jinbo  Ireland  Eric  Chen  Deli  Müller  Christoph  Zhang  Yushu 《Journal of Soils and Sediments》2020,20(4):1897-1905

Purpose

Nitrogen (N) is an important nutrient for re-vegetation during ecosystem restoration, but the effects of cover restoration on soil N transformations are not fully understood. This study was conducted to investigate N transformations in soils with different cover restoration ages in Eastern China.

Materials and methods

Soil samples were collected from four degraded and subsequently restored lands with restoration ages of 7, 17, 23, and 35 years along with an adjacent control of degraded land. A ¹⁵N tracing technique was used to quantify gross N transformation rates.

Results and discussion

Compared with degraded land, soil organic carbon (SOC) and total N (TN) increased by 1.60–3.97 and 2.49–5.36 times in restoration land. Cover restoration increased ammonium and nitrate immobilization, and dissimilatory nitrate reduction to ammonium (DNRA) by 0.56–0.96, 0.34–2.10, and 0.79–3.45 times, respectively, indicating that restoration was beneficial for N retention. There were positive correlations between SOC content and ammonium and nitrate immobilization and DNRA, indicating that the increase in soil N retention capacity may be ascribed to increasing SOC concentrations. The stimulating effect of SOC on ammonium immobilization was greater than its effect on organic N mineralization, so while SOC and TN increased, inorganic N supply did not increase. Autotrophic and heterotrophic nitrification increased with increasing SOC and TN concentrations. Notably, heterotrophic nitrification was an important source of NO₃^??N production, accounting for 47–67% of NO₃^??N production among all restoration ages.

Conclusions

The capacity of N retention was improved by cover restoration, leading to an increase in soil organic carbon and total N over time, but inorganic N supply capacity did not change with cover restoration age.

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疑似碘酊致牛死亡一例     

何国新  刘金杰 《中国兽药杂志》2005,39(10):53-53

笔者在临床上曾遇到一疑似“碘酊”致牛死亡的病例,由于未曾见过碘酊致牛死亡的报道,查阅资料也终未得到答案.笔者将其整理如下,供同行探讨。  相似文献   

A comparison of owner management and complications in 67 cats with esophagostomy and percutaneous endoscopic gastrostomy feeding tubes     

Ireland LM  Hohenhaus AE  Broussard JD  Weissman BL 《Journal of the American Animal Hospital Association》2003,39(3):241-246

Esophagostomy feeding tubes were placed in 46 cats. Percutaneous endoscopic gastrostomy (PEG) feeding tubes were placed in 21 cats. Owner management and complications and facility of use were evaluated retrospectively by review of medical records and owner survey. Both tube types were equally effective for maintenance of body weight, ease of owner management, and complication rates. All of 12 owners surveyed were comfortable with PEG tube management. Ninety-six percent of 24 owners surveyed were comfortable with esophagostomy tube management. The esophagostomy tube can be placed less invasively, without specialized equipment, making it an excellent alternative to the PEG tube.  相似文献   

Excretion of lead,zinc and calcium by the earthworm Dendrobaen a rubida living in soil contaminated with zinc and lead     

M.P. Ireland 《Soil biology & biochemistry》1976,8(5):347-350

Higher concentrations and total amounts of Pb were found in faeces than urine and mucus or coelomic fluid. The highest concentration of Zn was present in coelomic fluid but the highest total amount of Zn was in earthworm faeces. Metal analysis of the contents of various sections of the alimentary tract showed the highest concentration and total amount of Pb in the contents of the posterior alimentary tract. Zn and Ca showed the opposite distribution and the highest concentrations were found in anterior gut contents while the highest total amounts of Zn and Ca were found in posterior gut contents. The results are discussed in relation to dry weight of material, excretory sites and the presence of water soluble salts.The terminal segments of D. rubida were analysed for Pb and Zn and it was concluded that self-amputation or autotomy of these segments is probably not involved in the elimination of these metals.  相似文献