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排序方式: 共有93条查询结果,搜索用时 180 毫秒
1.
Mrklas Ole Chu Angus Lunn Stuart Bentley Laurence R. 《Water, air, and soil pollution》2004,159(1):249-263
The release of alkanolamines and glycols into the subsurface soils poses a potential hazard to the environment through impacted soil and groundwater. This study investigated aerobic and anaerobic biodegradability of monoethanolamine (MEA), ethylene glycol (MEG) and triethylene glycol (TEG). Significant levels of MEA (31 000 mg/kg), MEG (500 mg/kg) and TEG (2100 mg/kg) were successfully aerobically biodegraded in bioreactors. The aerobic slurry experiments suggested initial phosphate (P) limitation, as biodegradation rates increased by one order of magnitude after phosphate addition. Anaerobic decay of MEA, MEG and TEG was unaffected by P-addition. MEA, MEG and TEG degradation products such as acetate, ethanol and ammonium at about 75 000 mg/kg, 8100 mg/kg and 8800 mg/kg degraded completely and did not prevent aerobic biodegradation. This study confirms proposed biodegradation pathways of MEA, MEG, TEG and their breakdown products in natural soil and groundwater using indigenous microbes. Levels of contamination studied here are significantly higher than previously reported. 相似文献
2.
Salty stories,fresh spaces: Lessons for aquatic protected areas from marine and freshwater experiences 下载免费PDF全文
Erin K. Loury Shaara M. Ainsley Shannon D. Bower Ratana Chuenpagdee Tracy Farrell Amanda G. Guthrie Sokrith Heng Zau Lunn Abdullah Al Mamun Rodrigo Oyanedel Steve Rocliffe Suvaluck Satumanatpan Steven J. Cooke 《水产资源保护:海洋与淡水生态系统》2018,28(2):485-500
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4.
William A. Lindsay Ellen Wiedner Ramiro Isaza Hugh G.G. Townsend Maria Boleslawski D.P. Lunn 《Veterinary immunology and immunopathology》2010,133(2-4):287-289
Although captive elephants are commonly vaccinated annually against tetanus using commercially available tetanus toxoid vaccines marketed for use in horses and livestock, no data exists to prove that tetanus toxoid vaccination produces measurable antibody titers in elephants. An ELISA test was created to measure antibody responses to tetanus toxoid vaccinations in 22 Asian elephants ranging in age from 24 to 56 years (mean age 39 years) over a 7-month period. All animals had been previously vaccinated with tetanus toxoid vaccine, with the last booster administered 4 years before the start of the study. The great majority of elephants had titers prior to booster vaccination, and following revaccination all elephants demonstrated anamnestic increases in titers, indicating that this species does respond to tetanus vaccination. Surprisingly older animals mounted a significantly higher response to revaccination than did younger animals. 相似文献
5.
D F Smith D P Lunn G M Robinson S M McGuirk E V Nordheim P S MacWilliams 《American journal of veterinary research》1990,51(11):1715-1722
Hypochloremic metabolic alkalosis accompanied by hypokalemia and hyponatremia was induced experimentally in 7 adult sheep by diversion (loss) of gastric contents through an Ivan and Johnston cannula placed in the cranial part of the duodenum just distal to the pylorus. Cannula placement was easily accomplished, and cannulae were tolerated well by the sheep. Volume of effluent produced during the 60- to 120-hour period of diversion ranged from 7.7 to 14.9 L and tended to be greatest during the first 24 hours. All sheep became dehydrated, with mean PCV and plasma total protein concentration increases of 94.2 and 61.7%, respectively. Plasma chloride concentration decreased in linear fashion from a prediversion mean of 113 mEq/L (range, 111 to 117 mEq/L) to an end-point mean of 54 mEq/L (range, 45 to 65 mEq/L). Plasma sodium and potassium concentrations also decreased, though potassium concentration increased terminally. There were rapid increases in arterial blood pH and bicarbonate and base excess concentrations during the first 48 hours after diversion. However, during the final stages of diversion, sheep developed superimposed metabolic acidosis with increased plasma lactate concentration and high anion gap. 相似文献
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A.?F.?Tjin?Wong?Joe R.?W.?Summers G.?D.?Lunn M.?D.?Atkinson P.?S.?KettlewellEmail author 《Euphytica》2005,143(3):265-269
In 1998 and 1999 the UK winter wheat variety Rialto produced unexpected low Hagberg falling numbers that could not be directly linked to sprouting. It was proposed that these reductions in quality could be due to pre-maturity α-amylase activity (PMAA). The problem was not identified during the selection and commercial development stages. Our study tested the hypothesis that the variety Rialto is PMAA-susceptible. Analysis was done on 13 year-location combinations of field grown Rialto. Together, visual and chemical assessments of sprouting and iso-electric focusing of α-amylase isozymes identified several samples with significant α-amylase activity in the apparent absence of sprouting. In addition, tests with α-amylase sensitive Phadebas gel revealed distinctive PMAA discoloration patterns in 10–44% of the grain from the 13 samples, leading to the conclusion that Rialto is PMAA-susceptible. Diurnal temperature range accumulated for an 11 day period during a warm spell in early simulated grain development displayed a significant but negative correlation with the number of grains showing clear PMAA discoloration patterns on Phadebas gel. The number of clear PMAA grains correlated positively with rainfall accumulated over 11 days. These results suggest that PMAA can increase under conditions similar to those conducive to pre-harvest sprouting. It is however also possible that in some instances both PMAA and incipient sprouting could have produced similar patterns of α-amylase activity. In addition to tests with Rialto, Phadebas gel tests were therefore also done with the known high Hagberg varieties Option and Malacca, sprouted in a controlled environment. Results from the additional gel tests suggest that visual and chemical assessments of sprouting in the grain combined with Phadebas gel analysis could identify PMAA more reliably in grain sub-samples than Phadebas gel analysis alone. 相似文献
8.
Dormancy of wheat grains, the property conferring sprouting resistance, is affected by environmental conditions experienced
during grain development. We investigated the hypothesis that short dormancy duration in U.K. wheat grain (thus a high risk
of post-maturity sprouting) is related to weather conditions, i.e. high temperatures during grain development. Four wheat
varieties were grown at four sites ranging from the far south to the far north of the country in the years 1995–1997,ensuring
different temperature and rainfall conditions during grain development. This paper focuses on one variety, Hornet, which has
a high sprouting resistance rating. Other varieties gave similar results. Serial laboratory germination tests (seven days,
20°C) at 100°C-dayintervals were used to measure dormancy duration, which was assessed from logistic curves fitted to the
data. During the experiment the mean temperatures during grain development differed by over4°C, due to the site × year effect.
Significant effects (p>0.05) of site and year (i.e. weather) on dormancy were found, when definitions of dormancy duration of DA (number of days from anthesis to 50% germination in seven days at 20°C) or DP (number of days from physiological maturity at 45% grain moisture to 50% germination) were used. Dormancy was markedly shorter
in the hot, dry year 1995 compared to the cooler, wetter years 1996 and 1997. A relationship, as postulated by Belderok, between
accumulated temperature during the dough stage of grain filling and dormancy duration was not found. However, a relationship
of dormancy duration to the mean temperature during grain development was found, with short dormancy periods occurring after
high mean temperatures were experienced.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
9.
John Ellis Sheryl Gow Nicholas Pilfold Stacey Lacoste Nicholas J. Lunn Evan S. Richardson David McGeachy Megan Owen Bruce Rideout 《The Canadian veterinary journal. La revue veterinaire canadienne》2021,62(7):725
Bordetella bronchiseptica is a promiscuous bacterium that infects a variety of species but has not been reported in free-ranging polar bears (Ursus maritimus). Sera from 385 polar bears from the western Hudson Bay region, 1986 to 2017, were tested for reactivity to B. bronchiseptica with enzyme-linked immunosorbent assays using anti-canine IgG and Streptococcus protein G as secondary reagents. Sera from bears had variable reactivity to B. bronchiseptica antigens, and there was no difference among bears that had a history of coming near the town of Churchill, Manitoba, and bears that did not. Although the sources of exposure were not determined, equivalent results in both groups suggest that potential exposure to humans (aside from handling during sampling) and their animals (dogs) was not an important co-factor in sero-positivity to B. bronchiseptica. 相似文献
10.
A five-year-old standardbred mare suffered a cervical oesophageal rupture subsequent to a kick. Marked cellulitis and extensive soft tissue damage resulted. Treatment consisted of creating an oesophageal fistula, local debridement and systemic antibiotics. The mare made a long but successful recovery. Treatment of oesophageal rupture in the horse is discussed. 相似文献