贵州省续随子新品系种子含油量及其脂肪酸组成分析   总被引：1，自引：0，他引：1  

张燕  龚德勇  曾松  李搏 《现代农业科技》2011,(11):19-20

通过对4个续随子品种新品系NX-1、NX-2、NX-3、NX-4种子含油量及其油酸值、脂肪酸组成进行检测分析,结果表明:NX-1、NX-3、NX-4等3个品种材料的含油率均大于40%。其中油酸值最高的是NX-4,为8.56 mg KOH/g。4个品种材料的种子油成分主要是C16、C18、C20脂肪酸组成结构,与石化柴油的脂肪酸组成结构相类似,表现为热质高、易转化、污染低等特点,是制备生物柴油十分理想的生产原料。  相似文献   

Biological properties of a naturally attenuated infectious bursal disease virus isolated from a backyard chicken flock     

Velhner M  Mitevski D  Potkonjak D  Stojanović D  Kovačević M  Petrović T  Aleksić-Kovačević S 《Acta veterinaria Hungarica》2010,58(4):499-509

The biological properties of an infectious bursal disease (IBD) virus isolated from bursas collected during an outbreak in a village chicken flock in Macedonia are described. The mortality rate was 50%. Two viruses coexisted in the bursas of infected chickens (IBDVwt and IBDVtc). The virus termed IBDVtc grows on chicken embryo fibroblast (CEF) cells from the first passage. Specific pathogen free chickens inoculated with IBDVtc at passage level 4 did not develop any clinical signs of disease. Some discrete bleeding on the leg muscles was seen and the bursa of Fabricius revealed pathological lesions similar to those caused by classical strains. However, the bursa recovered quickly (bursa lesion score 2) by 14 days post infection (PI). We also found evidence of bursal repopulation by means of perinuclear antigen staining. Strong CD3 influx was evident at 4 days PI, and at 33 days PI the CD3+ cell finding was comparable to the control. The mean antibody titre was 9.2 log 2 at 14 days PI. The amino acid composition of VP2 in IBDVwt (222 Ala, 242 Ile, 253 Gln, 256 Ile, 279 Asp, 284 Ala, 294 Ile and 299 Ser) is described. The same sequence was found in IBDVtc, except for two point mutations, at Gln253→His and Ala284→Thr. Such amino acid substitution is responsible for partial attenuation and the ability of the strain to replicate in cell culture. None of the commercial vaccine viruses has a similar arrangement of amino acids in the variable domain of IBDV. This strongly suggests that IBDVtc originates from a very virulent strain. To the best of our knowledge, this is the first report of a concomitant infection of chickens with highly pathogenic IBDV and its mutant counterpart.  相似文献   

Scleractinian coral species survive and recover from decalcification     

Fine M  Tchernov D 《Science (New York, N.Y.)》2007,315(5820):1811

Anthropogenic-driven accumulation of carbon dioxide in the atmosphere and projected ocean acidification have raised concerns regarding the eventual impact on coral reefs. This study demonstrates that skeleton-producing corals grown in acidified experimental conditions are able to sustain basic life functions, including reproductive ability, in a sea anemone-like form and will resume skeleton building when reintroduced to normal modern marine conditions. These results support the existence of physiological refugia, allowing corals to alternate between nonfossilizing soft-body ecophenotypes and fossilizing skeletal forms in response to changes in ocean chemistry. This refugia, however, does not undermine the threats to reef ecosystems in a high carbon dioxide world.  相似文献   

Virtual international experiences in veterinary medicine: an evaluation of students' attitudes toward computer-based learning     

French BC  Hird DW  Romano PS  Hayes RH  Nijhof AM  Jongejan F  Mellor DJ  Singer RS  Fine AE  Gay JM  Davis RG  Conrad PA 《Journal of veterinary medical education》2007,34(4):502-509

While many studies have evaluated whether or not factual information can be effectively communicated using computer-aided tools, none has focused on establishing and changing students' attitudes toward international animal-health issues. The study reported here was designed to assess whether educational modules on an interactive computer CD elicited a change in veterinary students' interest in and attitudes toward international animal-health issues. Volunteer veterinary students at seven universities (first-year students at three universities, second-year at one, third-year at one, and fourth-year at two) were given by random assignment either an International Animal Health (IAH) CD or a control CD, ParasitoLog (PL). Participants completed a pre-CD survey to establish baseline information on interest and attitudes toward both computers and international animal-health issues. Four weeks later, a post-CD questionnaire was distributed. On the initial survey, most students expressed an interest in working in the field of veterinary medicine in another country. Responses to the three pre-CD questions relating to attitudes toward the globalization of veterinary medicine, interest in foreign animal disease, and inclusion of a core course on international health issues in the veterinary curriculum were all positive, with average values above 3 (on a five-point scale where 5 represented strong agreement or interest). Almost all students considered it beneficial to learn about animal-health issues in other countries. After students reviewed the IAH CD, we found a decrease at four universities, an increase at one university, and no change at the remaining two universities in students' interest in working in some area of international veterinary medicine. However, none of the differences was statistically significant.  相似文献   

Assessment of dipropylnitrosamine levels in a tomato field following application of treflan EC     

R Ross  J Morrison  D H Fine 《Journal of agricultural and food chemistry》1978,26(2):455-457

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Community composition of soil microarthropods of acid forest soils as affected by wood ash application     

Mira Liiri  Jari HaimiHeikki Setälä 《Pedobiologia》2002,46(2):108-124

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Computer simulations of the diffusion of a substrate to an active site of an enzyme   总被引：6，自引：0，他引：6  

K Sharp  R Fine  B Honig 《Science (New York, N.Y.)》1987,236(4807):1460-1463

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Virology. Poliomyelitis eradication--a dangerous endgame     

Nathanson N  Fine P 《Science (New York, N.Y.)》2002,296(5566):269-270

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Enhanced electrical properties of electrospun nylon66 nanofibers containing carbon nanotube fillers and Ag nanoparticles     

R. Nirmala  Kyung Soo Jeon  R. Navamathavan  Mira Park  Hak Yong Kim  Soo-Jin Park 《Fibers and Polymers》2014,15(5):918-923

In this study, we describe the preparation and characterization of electrospun Nylon66 composite nanofibers incorporated with carbon nanotubes (CNT) fillers and silver nanoparticles. We have incorporated the composites in to Nylon66 nanofibers to enhance the characteristics of the resultant composite nanofibers. The resultant composite nanofibers were characterized by using field-emission scanning electron microscopy, energy dispersive X-ray analysis, high-resolution transmission electron microscopy, X-ray diffraction, and current-voltage (I–V) measurement analysis. The morphology of the composite nanofibers exhibited densely arranged mesh-like ultrafine nanofibers which were strongly bound in between the main fibers. From I–V characteristics, it was observed that the incorporation of CNT fillers and Ag nanoparticles in to electrospun Nylon66 composite nanofibers can be significantly enhanced the electrical properties.  相似文献   

Screening of alternative products for integrated pest management of cucurbit powdery mildew in Sweden     

Mira Rur  Birgitta Rämert  Margareta Hökeberg  Ramesh R. Vetukuri  Laura Grenville-Briggs  Erland Liljeroth 《European journal of plant pathology / European Foundation for Plant Pathology》2018,150(1):127-138

Cucurbit powdery mildew (CPM) is one of the most important plant protection problems in Swedish cucumber production. CPM fungi have developed resistance to the commonly used fungicide (Imazalil) rendering its current use less effective. We therefore screened a selection of alternative products, evaluating their ability to control CPM in seven small-scale, semi-commercial, greenhouse experiments. Products were screened for their ability to suppress CPM on a susceptible cultivar, in 2013. In 2015, the best treatments were tested in different combinations, in different intervals on a susceptible and a partially resistant cultivar. The treatment that gave the best CPM control was Sakalia in combination with wetting agent Yuccah, (based on Reynoutria sachaliensis and Yucca schidigera respectively) applied at 7-day intervals. This treatment was highly efficient on both cucumber cultivars. Sakalia mixed with Yuccah applied at 14-day intervals had an almost equally controlling effect on CPM. The microbial pesticides, Polyversum (Pythium oligandrum) and AQ10 (Ampelomyces quiscalis) and the fungicide Imazalil, provided no to poor control of CPM compared to control treatments. Hortistar (Silicon) partially reduced CPM infections and was more efficient on the partially resistant cultivar. We conclude that Sakalia in combination with wetting agent Yuccah could efficiently control the disease even under the severe conditions caused by artificial inoculation. Further testing of this combination in commercial greenhouses will enable evaluation of the potential effects on yield and beneficial or pest insects. The knowledge gained from this study can be used to develop IPM tools for commercial production systems.  相似文献