Intravenous catheterisation of foetus and mare in late pregnancy: management and respiratory, circulatory and metabolic effects.     

P M Taylor  M Silver  A L Fowden 《Equine veterinary journal》1992,24(5):391-396

The uterine and umbilical vessels of 12 pregnant ponies were catheterised to study foetal metabolism. The effects of this procedure on maternal and foetal cardiovascular, respiratory, metabolic and adrenocortical activity were monitored during and after surgery. Premedication with acepromazine-butorphanol-detomidine was followed by induction of anaesthesia with detomidine and ketamine and maintenance, using mechanical ventilation, with halothane in oxygen and nitrous oxide. Mean maternal arterial blood pressure was greater than 70 mmHg during anaesthesia and arterial oxygen tension remained over 100 mmHg. The foetuses were adequately oxygenated but were hypercapnic and lactic acidaemic. Most maternal and foetal blood gases and metabolites had returned to normal by 24 h, although foetal plasma lactate fell more slowly. The maternal adrenocortical discharge was less severe than reported previously and plasma cortisol had fallen to basal levels by 48 h after surgery. Foetal plasma cortisol remained low and did not change during or after surgery. Arterio-venous metabolite and gas tension differences across the uterine and umbilical circulations were slightly greater at operation than in the recovery period, suggesting that uteroplacental perfusion may have been impaired during surgery. Post-operative recovery of the mare and foetus was satisfactory and subsequent problems associated with the foetal catheters were not related to the anaesthesia or surgery.  相似文献   

Uranium and Lead Isotopic Stability in a Metamict Zircon under Experimental Hydrothermal Conditions     

Pidgeon RT  O'neil JR  Silver LT 《Science (New York, N.Y.)》1966,154(3756):1538-1540

Abstract. Disturbance of the uranium-lead isotopic system in a metamict Ceylon zircon has been produced in a 2 molal NaCI solution at 500 degrees C and 1000 bars fluid pressure. Loss of radiogenic lead to the extent of 61 percent in 13 days was the most significant effect. The experimental results support the episodic rather than continuous lead-loss interpretation of natural zircon systems utilized in geochronology.  相似文献   

Tendon injuries and their treatment in the horse.     

K G McCullagh  A E Goodship  I A Silver 《The Veterinary record》1979,105(3):54-57

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Body composition,leptin, and the leptin receptor and their relationship to the growth hormone (GH) axis in growing wethers treated with zeranol     

Narro LA  Thomas MG  Silver GA  Rozeboom KJ  Keisler DH 《Domestic animal endocrinology》2003,24(3):243-255

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Cerebellar cystic meningioma in a dog     

Bagley RS  Silver GM  Gavin PR 《Journal of the American Animal Hospital Association》2000,36(5):413-415

A 21-kg, seven-year-old, male, mixed-breed Labrador retriever was admitted for incoordination and a head tilt of approximately three months' duration. Ataxia was noted of the trunk and limbs, and there was a head tilt to the right side. Conscious proprioceptive deficits were present in the left thoracic and pelvic limbs (i.e., hemiparesis). These abnormalities were consistent with paradoxical vestibular syndrome and a lesion involving the caudal cerebellar peduncle. A mass lesion consisting primarily of fluid was present on magnetic resonance imaging and at craniectomy. Histopathological diagnosis was a cystic meningioma. Based upon previous reports and experience, the location of this tumor was unusual.  相似文献   

Caprine besnoitiosis: an emerging threat and its relationship to some other infections of ungulates by Besnoitia species     

A. Oryan  I.A. Silver  R. Sadoughifar 《Research in veterinary science》2014

Caprine besnoitiosis, caused by the cyst-forming protozoal apicomplexan Besnoitia caprae appears to be endemic in Kenya, Nigeria and Iran, but has yet to be detected in other parts of the world. The infection causes an important parasitic disease of goats in affected developing countries. Bovine besnoitiosis, is a widespread disease of cattle in Africa, Asia (but not Iran) and southern Europe. Recent epidemiological data confirm that the incidence and geographical range of bovine besnoitiosis in Europe is increasing, which is why growing attention has been given to the condition during the past decade. This paper reviews pertinent information on the biology, epidemiology, pathology, clinical signs, diagnosis and control of caprine besnoitiosis, together with its similarities to, and differences from, bovine besnoitiosis. The serious economic consequences of besnoitiosis on goat breeding and local meat and hide industries is also considered.  相似文献   

Biohazard: virus-contaminated liquid nitrogen     

Schafer TW  Everett J  Silver GH  Came PE 《Science (New York, N.Y.)》1976,191(4222):24-26

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Colicin-tolerant mutants of Escherichia coli: resistance of membranes to colicin E1   总被引：25，自引：0，他引：25  

P Bhattacharyya  L Wendt  E Whitney  S Silver 《Science (New York, N.Y.)》1970,168(934):998-1000

Colicin E1 blocks proline accumulation by membrane vesicles prepared from wild-type sensitive Escherichia coli. Two classes of mutant cells are unaffected by colicin. Vesicles from colicin-resistant strains are sensitive to colicin E1, whereas vesicles from colicin-tolerant strains are unaffected by colicin El. These results suggest that the colicin E1 receptor is on the cell membrane and that colicin-tolerant strains have altered membranes while colicin-resistant strains have altered cell walls.  相似文献   

Marine snow: microplankton habitat and source of small-scale patchiness in pelagic populations     

Silver MW  Shanks AL  Trent JD 《Science (New York, N.Y.)》1978,201(4353):371-373

In near-surface waters of the neritic zone, the fragile aggregate material called "marine snow" is enriched by a variety of planktonic organisms and detrital products of plankton. Here marine snow is a source of patchiness and taxonomic diversity for microplankton populations and is a likely food resource and recycling agent for fecal particles.  相似文献   

Synthesis of a sulfur-containing amino acid under simulated prebiotic conditions   总被引：1，自引：0，他引：1  

G Steinman  A E Smith  J J Silver 《Science (New York, N.Y.)》1968,159(819):1108-1109

Ultraviolet irradiation of an aqueous solution of ammonium thiocyanate produces the sulfur-containing amino acid methionine. Synthesis of this class of biocompound fills another important gap in development of an overall picture of how prebiological chemistry may have evolved on primitive Earth.  相似文献