INTRA-VITAM COLOR REACTIONS     

Cobb NA 《Science (New York, N.Y.)》1917,46(1181):167-169

  相似文献   

Development and characterization of an equine skin‐equivalent model     

Santiago Cerrato  Laura Ramió‐Lluch  Pilar Brazís  Rosa Maria Rabanal  Dolors Fondevila  Anna Puigdemont 《Veterinary dermatology》2014,25(5):475-e77

  相似文献   

Analysis of chicken cytokine and chemokine gene expression following Eimeria acervulina and Eimeria tenella infections   总被引：2，自引：0，他引：2  

Hong YH  Lillehoj HS  Lee SH  Dalloul RA  Lillehoj EP 《Veterinary immunology and immunopathology》2006,114(3-4):209-223

  相似文献   

Reversal of resistance to pyriproxyfen in the Q biotype of Bemisia tabaci (Hemiptera: Aleyrodidae)     

Wilson M  Moshitzky P  Laor E  Ghanim M  Horowitz AR  Morin S 《Pest management science》2007,63(8):761-768

Pyriproxyfen, a juvenile hormone (JH) mimic, is a biorational insecticide that disrupts insect development. It is one of the principal insecticides being used to control Bemisia tabaci (Gennadius) on cotton, and has many environmentally positive attributes that make it compatible with integrated pest management (IPM) programs. In Israel, a high level of resistance to pyriproxyfen has been observed in several isolated regions. Here, tests were conducted to establish whether temporal refuges from exposure to pyriproxyfen could be useful for restoring the effectiveness of the compound. Resistance was found to decrease by a factor of 8 when exposure to pyriproxyfen was ceased for 13 generations. Reversal of resistance was accompanied with increased biotic fitness of the revertant colony. By incorporating experimental estimates of nymph survival, sex ratio, fecundity, egg hatching rate and developmental time, the seasonal cost per generation for resistant insects was estimated to be 25%. A genetic simulation model, optimized by empirical data from bioassays, predicted fitness cost per generation of 19% for resistant homozygous (RR) females and hemizygous (R) males, and produced rates of reversal similar to the experimental results. The model also predicted that, even after 5 years ( approximately 55 generations) without pyriproxyfen treatments, the frequency of the resistance allele (R) will still remain high (0.02). It is therefore concluded, on the basis of experimental and modeling results, that the effectiveness of temporal refuges for reversing development of resistance to pyriproxyfen in B. tabaci may be limited.  相似文献   

In focus: IPM using novel insecticides and other approaches     

Ishaaya I  Horowitz AR 《Pest management science》2007,63(8):729-729

  相似文献   

Avian influenza virus H9 subtype in poultry flocks in Jordan     

Roussan DA  Khawaldeh GY  Al Rifai RH  Totanji WS  Shaheen IA 《Preventive veterinary medicine》2009,88(1):77-81

  相似文献   

APPROXIMATE MEASUREMENT OF TEXTILE FIBERS     

Cobb NA 《Science (New York, N.Y.)》1914,40(1036):683-684

  相似文献   

Offshore Financial Services and the Internet: Creating Confidence in the Use of Cyberspace?     

Sharon Cobb 《Growth and change》2003,34(2):244-259

Abstract The use of the Internet and World Wide Web (WWW) as a distributive medium is seen by many businesses as a legitimate way to cut costs of operation. Confidence is growing in the use of this medium to transact business because of the increasing sophistication of firewalls, encryption software, and digital key technology. This paper presents empirical evidence from one offshore financial center where the process of legislative and regulatory reform put in place to establish confidence in the traditional provision of offshore financial services is now being used to regulate and legitimize the online distribution of such services. The results show that all firms surveyed for this study use the Internet for routine brochure‐ware purposes and the larger firms (particularly in the offshore life insurance sector) are developing more sophisticated customized transactional functions via extranet platforms. Tensions exist though with respect to “regulatory grasp” via the Internet, as offshore places are being put under increased pressure by supranational organizations such as the Organization for Economic Cooperation and Development (OECD) and Financial Action Task Force (FATF) to require greater transparency in offshore financial transactions.  相似文献   

Ozone pollution modifies the response of sugarbeet to the herbicide phenmedipham     

J. Dixon  M. R. Hull  A. H. Cobb  G. E. Sanders 《Water, air, and soil pollution》1995,85(3):1443-1448

Experiments were conducted in which sugarbeet plants (Beta vulgaris L. cv. Saxon) with 2 to 3 leaves were exposed to a simulated 2 day ozone episode (100 nl l^?1, 7 h d^?1). Three days later, the plants were sprayed with field rate phenmedipham (1.14 kg a.i. ha^?1) and growth analysis conducted 7 days later indicated an antagonistic interaction was occurring. Physiological and biochemical studies were undertaken to determine the nature of this antagonism. Treatment with phenmedipham increased the ratio of transpiration to photosynthetic rates within 2 days of spraying, whilst exposure to ozone had no effect. When the two treatments were combined, water use efficiency was not significantly different from that when phenmedipham was applied alone. In contrast, trends in the membrane permeability after treatment, indicated that the response of plants exposed to ozone followed by treatment with the herbicide, was intermediate between that of the herbicide (high permeability) and ozone (low permeability). Furthermore, when the two treatments were combined the results of antioxidant enzyme assays indicated greater than expected activities of enzymes which are mainly cytosolic, eg. guaiacol peroxidase, as well as a similar increase in the activity of the mainly chloroplastic superoxide dismutase. Treatment with ozone alone and phenmedipham alone only slightly increased superoxide dismutase. Ozone may therefore induce the activities of these protective enzymes. Thus, when another oxidative stress, such as the photosystem II inhibitor phenmedipham, was applied the plants could then respond more quickly and showed less herbicide visible damage.  相似文献   

Effect of tillage practices on irrigation requirement,weed control and yield of lowland rice     

S.Rami Reddy  S.B. Hukkeri 《Soil & Tillage Research》1983,3(2):147-158

Dry soil bulk density increased from 1.42 g/cm³ with ordinary ploughing to 1.69 g/cm³ with puddling twice and to 1.80 g/cm³ with soil compaction. Consequently, saturated hydraulic conductivity decreased from 113 mm/day with ordinary ploughing to 48 mm/day with puddling twice and to 29 mm/day with soil compaction. The irrigation requirement was 2295 mm with ordinary ploughing compared with 1350 mm with soil compaction. Dry weight of weeds was only 0.6 and 0.7 t/ha with puddling twice and soil compaction, respectively, and 3.9 t/ha with ordinary ploughing. The highest grain yield of rice (4.5 t/ha) was obtained with puddling twice, due to effective weed control. Weeds shared 57 and 35% of the nutrient (N+P+K) with ordinary ploughing and puddling once, respectively, as compared with only 8 and 15% with puddling twice and soil compaction, respectively. The ratio of total biological yield (grain + straw + weeds) to total nutrient (N+P+K) uptake was 59.0 with puddling twice and soil compaction as compared with 53.5 with puddling once and 50.0 with ordinary ploughing. This suggests that tillage practices may affect the efficiency of the use of soil and applied nutrients by the rice crop.  相似文献