Maternal and umbilical venous plasma lipid concentrations at delivery in the mare     

J P Stammers  D Hull  D P Leadon  L B Jeffcott  P D Rossdale 《Equine veterinary journal》1991,23(2):119-122

The concentrations and fatty acid composition of the plasma free fatty acid, triacylglycerol and phospholipid fractions were determined in maternal and umbilical cord vein blood samples taken at delivery from 17 mares. Maternal and umbilical vein plasma free fatty acid concentrations were of a similar order and a positive correlation was found between the two levels suggesting that the equine placenta is permeable to fatty acid. Substantial amounts of the essential fatty acids and their longer chain derivatives were seen in both umbilical vein plasma free fatty acid and phospholipid fractions supporting this view. Certain long chain polyunsaturated derivatives of the essential fatty acids found in the umbilical venous plasma phospholipid fraction were not seen in the maternal circulating lipids. The precursor fatty acids were readily available to both foetal and placental tissues and therefore must have been elongated and incorporated into phospholipid by either or both. Very small amounts of the essential fatty acids were found in adipose stores in the newborn foal and virtually no fat stores at all in the newborn foal liver.  相似文献   

Superconductivity and antiferromagnetism in boron-rich lattices     

Matthias BT  Geballe TH  Andres K  Corenzwit E  Hull GW  Maita JP 《Science (New York, N.Y.)》1968,159(3814):530

Ferromagnetism, antiferromagnetism, or superconductivity has been discovered in most hexa- and dodecaborides.  相似文献   

Superconductivity of Beta-uranium     

Matthias BT  Geballe TH  Corenzwit E  Andres K  Hull GW  Ho JC  Phillips NE  Wohlleben DK 《Science (New York, N.Y.)》1966,151(3713):985-986

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Genome-scale proteomics reveals Arabidopsis thaliana gene models and proteome dynamics     

Baerenfaller K  Grossmann J  Grobei MA  Hull R  Hirsch-Hoffmann M  Yalovsky S  Zimmermann P  Grossniklaus U  Gruissem W  Baginsky S 《Science (New York, N.Y.)》2008,320(5878):938-941

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Sero‐epidemiology of Canine Leptospirosis in Trinidad: Serovars,Implications for Vaccination and Public Health     

A. A. Adesiyun  C. Hull‐jackson  N. Mootoo  S. Halsall  R. Bennett  N. R. Clarke  C. U. Whittington  N. Seepersadsingh 《Zoonoses and public health》2006,53(2):91-99

A sero‐epidemiological study on canine leptospirosis was conducted in house, stray, farm and hunting dogs, as well as in suspect cases of clinical canine leptospirosis. Serum samples were collected from apparently healthy (vaccinated and non‐vaccinated), house dogs. A questionnaire was administered to the owners to elicit information on risk factors for leptospirosis. The microscopic agglutination test was used to screen for leptospirosis using 17 international serovars. Reciprocal titres of between 100 and <800 were considered as evidence of past exposure while reciprocal titres of 800 or greater were classified as suggestive of acute/current infection. Of a total of 419 serum samples tested, 61 (14.6%) were seropositive for Leptospira agglutinins, 23 (5.5%) had mixed infections and 16 (3.8%) had current infection. Amongst 50 suspected cases of clinical leptospirosis, 24 (48.0%) were seropositive and only 13 (26.0%) had current infection compared with 10 (6.3%) and three (1.9%) of 160 apparently healthy house dogs respectively. The difference was statistically significant (P < 0.05; χ²). Twelve (25.5%) of 47 hunting dogs, 10 (20.4%) of 49 farm dogs and five (4.4%) of 113 stray dogs were seropositive (P < 0.05; χ²). Overall, a total of nine serovars were detected with serovars mankarso, icterohaemorrhagiae RGA, autumnalis and copenhageni being involved in 29 (47.5%), 20 (32.8%), 25 (41.0%) and 10 (16.4%) respectively in 61 seropositive dogs (P < 0.05; χ²). Serovar mankarso was most predominant in seropositive apparently healthy dogs, 37.8% (14/37), suspected clinical cases of leptospirosis, 62.5% (15/24) compared with serovar icterohaemorrhagiae with a frequency of 21.6% (8/37) and 50.0% (12/24), the difference being statistically significant (P < 0.05; χ²). Although all vaccines used for prevention of canine leptospirosis in the country contain serovars canicola and icterohaemorrhagiae, serovar mankarso was mostly associated with infection and disease and may be a good candidate for inclusion in the vaccine used locally. The public health risk posed to owners of dogs infected with Leptospira cannot be over‐emphasized considering the zoonotic nature of the disease.  相似文献   

Phenmedipham–Ozone Pollution Interactions in Sugarbeet (Beta vulgaris L. cv. Saxon): A Physiological Study     

Janet Dixon  Mark R. Hull  Andrew H. Cobb  Gina E. Sanders 《Pest management science》1996,46(4):381-390

Actively growing sugarbeet is treated with the post-emergent herbicide phenmedipham at times when ozone pollution episodes are likely to occur. There is a possibility of an interaction occurring between ozone and phenmedipham as both treatments produce similar effects in susceptible plants, such as a reduction in growth and photosynthesis and an increase in the activities of endogenous antioxidant enzymes. To investigate this likelihood, laboratory experiments were conducted in which two- to three-leaf sugarbeet plants (Beta vulgaris L. cv. Saxon) were exposed to a simulated two-day ozone episode (100 nl litre⁻¹, 7 h day⁻¹) followed three days later by treatment with field rate phenmedipham (1·14 kg AI ha⁻¹). Growth analysis indicated that an interaction was occurring in which plants treated with ozone and phenmedipham had less reduction in shoot fresh weight than expected. Exposure to phenmedipham alone or ozone followed by phenmedipham reduced net photosynthesis by over 50% and transpiration rate by 30%. The activities of antioxidant enzymes such as catalase, guaiacol peroxidase and superoxide dismutase were stimulated by both treatments individually, but to a greater extent when ozone and phenmedipham were combined. For example, three days after herbicide treatment, the activity of superoxide dismutase increased by 20% in plants treated with ozone alone, 20% in plants treated with phenmedipham alone and 85% in plants that were treated with ozone followed by phenmedipham. We conclude that ozone pollution may predispose sugarbeet to tolerate the herbicide phenmedipham by enhancing the activity of the endogenous antioxidant detoxification enzyme system.  相似文献   

Abstracts of presentations on selected topics at the XIVth international plant protection congress (IPPC) July 25–30, 1999     

R. Hull  H. A. Kuiper  Maryvon Y. Noordam  Marjorie A. Hoy  Jenny S. Cory  A. C. Fereres  P. Gonzalez  F. Meins  Y. Elkind  Benedicte Charrier 《Phytoparasitica》1999,27(4):299-332

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A Molecular Approach for Detecting Stage-Specific Predation on Lygus hesperus (Hemiptera: Miridae)     

James R Hagler  Miles T Casey  Allya M Hull  Scott A Machtley 《Journal of insect science (Online)》2020,20(6)

A molecular gut analysis technique is described to identify predators of Lygus hesperus (Knight), a significant pest of many crops. The technique is unique because it can pinpoint which life stage of the pest was consumed. Sentinel egg masses designed to mimic the endophytic egg-laying behavior of L. hesperus were marked with rabbit serum, while third instar and adult L. hesperus were marked with chicken and rat sera, respectively. Then, the variously labeled L. hesperus life stages were introduced into field cages that enclosed the native arthropod population inhabiting an individual cotton plant. After a 6-h exposure period, the predator assemblage, including the introduced and native L. hesperus population, in each cage were counted and had their gut contents examined for the presence of the variously marked L. hesperus life stages by a suite of serum-specific enzyme-linked immunosorbent assays (ELISA). The whole-plant sampling scheme revealed that Geocoris punticpes (Say) and Geocoris pallens Stal (Hemiptera: Geocoridae) and members of the spider complex were the numerically dominant predator taxa in the cotton field. The gut content analyses also showed that these two taxa appeared to be the most prolific predators of the L. hesperus nymph stage. Other key findings include that Collops vittatus (Say) (Coleoptera: Melyridae) and Solenopsis xyloni McCook (Hymenoptera: Formicidae) appear to be adept at finding and feeding on the cryptic L. hesperus egg stage, and that L. hesperus, albeit at low frequencies, engaged in cannibalism. The methods described here could be adapted for studying life stage-specific feeding preferences for a wide variety of arthropod taxa.  相似文献   

Use of a Fluorophore to Tag Arthropods for Mark-Release-Recapture Type Research     

James R Hagler  Allya M Hull  Miles T Casey  Scott A Machtley 《Journal of insect science (Online)》2021,21(6)

We examined the feasibility of externally marking insects with the liquid fluorescent forensic theft deterrent, SmartWater (SmartWater CSI, LLC.). We sprayed captive Lygus hesperus (Knight) (Hemiptera: Miridae), Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), and Hippodamia convergens Guérin-Méneville (Coleoptera: Coccinellidae) with SmartWater fluorophore, and then qualitatively examined them for fluorescence by visual inspection under ultraviolet (UV) light and quantitatively measured them with a multiwavelength microplate fluorometer. The results indicate that this product has enormous potential as a taggant for L. hesperus and B. tabaci. However, the marking efficiency for H. convergens was only adequate. The advantages and limitations of using SmartWater as a biological marker for arthropod mark-release-recapture research are discussed.  相似文献   

波尔山羊耳成纤维细胞的分离培养与保存   总被引：1，自引：0，他引：1  

陈华  朱必龙  章孝荣 《黑龙江动物繁殖》2007,15(3):7-10

本文研究了波尔山羊耳成纤维细胞的体外培养,包括分离纯化和生长特征,同时还研究了成纤维细胞的冷藏和冷冻保存.结果表明,波尔山羊耳成纤维细胞贴壁生长,一般经历潜伏期、指数增生期和平台期;4℃体外冷藏时间为5 d;冷冻保存时4℃平衡1 h、-80℃过夜,然后直接投入液氮中,解冻后培养得到61.6%的贴壁率.  相似文献