Labeling theory     

Townsend JM 《Science (New York, N.Y.)》1977,196(4289):482-484

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THE PRIBILOF FUR SEAL HERD     

Townsend CH  Clark GA 《Science (New York, N.Y.)》1912,35(896):334-338

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SHACKLETON'S CONTRIBUTION TO BIOGEOGRAPHY     

Townsend CH 《Science (New York, N.Y.)》1910,32(822):433-435

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ON MUSCOID AND ESPECIALLY TACHINID SYNONYMY     

Townsend CH 《Science (New York, N.Y.)》1911,33(857):860-863

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Ecology. Ecology for a crowded planet     

Palmer M  Bernhardt E  Chornesky E  Collins S  Dobson A  Duke C  Gold B  Jacobson R  Kingsland S  Kranz R  Mappin M  Martinez ML  Micheli F  Morse J  Pace M  Pascual M  Palumbi S  Reichman OJ  Simons A  Townsend A  Turner M 《Science (New York, N.Y.)》2004,304(5675):1251-1252

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CHEMICAL EXAMINATION OF THE LIPID FRACTION OF ROYAL JELLY     

Townsend GF  Lucas CC 《Science (New York, N.Y.)》1940,92(2376):43-44

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Self-Assembled Smectic Phases in Rod-Coil Block Copolymers   总被引：1，自引：0，他引：1  

JT Chen  EL Thomas  CK Ober  G Mao 《Science (New York, N.Y.)》1996,273(5273):343-346

Rod-coil block copolymers are self-assembling polymers that combine the physics of orientational ordering of rodlike polymers and the microphase separation of coil-coil block copolymers. Several new solid-state morphologies were observed in a series of anionically synthesized model poly(hexyl isocyanate-b-styrene) rod-coil diblock copolymers examined by transmission electron microscopy and selected-area electron diffraction. The rod-coils formed smectic C-like and O-like morphologies with domain sizes ranging from tens of nanometers to almost 1 micrometer. Both structural and orientational changes were found for increasing rod volume fractions. In addition, some morphologies exhibited spontaneous long-range orientational order over many tens of micrometers.  相似文献   

Transformation of the nitrogen cycle: recent trends, questions, and potential solutions   总被引：12，自引：0，他引：12  

Galloway JN  Townsend AR  Erisman JW  Bekunda M  Cai Z  Freney JR  Martinelli LA  Seitzinger SP  Sutton MA 《Science (New York, N.Y.)》2008,320(5878):889-892

Humans continue to transform the global nitrogen cycle at a record pace, reflecting an increased combustion of fossil fuels, growing demand for nitrogen in agriculture and industry, and pervasive inefficiencies in its use. Much anthropogenic nitrogen is lost to air, water, and land to cause a cascade of environmental and human health problems. Simultaneously, food production in some parts of the world is nitrogen-deficient, highlighting inequities in the distribution of nitrogen-containing fertilizers. Optimizing the need for a key human resource while minimizing its negative consequences requires an integrated interdisciplinary approach and the development of strategies to decrease nitrogen-containing waste.  相似文献   

Tear-film osmolarity in normal cats and cats with conjunctivitis     

Davis K  Townsend W 《Veterinary ophthalmology》2011,14(Z1):54-59

Objective To compare the tear‐film osmolarity of normal cats and cats with conjunctivitis. Animal studied The population consisted of shelter, research, and privately owned cats. Procedures Cats were classified as normal or having conjunctivitis. An ophthalmic examination including Schirmer tear test (STT), fluorescein staining, tear‐film break‐up time (TFBUT), intraocular pressure (IOP), and slit‐lamp biomicroscopy of the anterior segment was performed. The severity of conjunctivitis was graded and assigned a numerical score. The Tear Lab^TM Osmolarity System was utilized to determine the tear‐film osmolarity. Unpaired t‐tests were used to compare tear‐film osmolarity, TFBUT, IOP, and STT of the two groups. Results A total of 93 cats (186 eyes) were examined. There were 37 normal cats (74 eyes) and 39 conjunctivitis cats (78 eyes). The mean age was 2.34 years. There was no statistical difference (P = 0.2065) between the median tear‐film osmolarity of normal cats (328.5 ± 17.94 mOsms/L) and conjunctivitis cats (325.0 ± 24.84 mOsms/L). Cats with conjunctivitis had an accelerated TFBUT (P < 0.0001) and lower IOPs (P < 0.0001) as compared to normal cats. No statistical difference was found between STT values (P = 0.1304). Conclusions The median tear‐film osmolarity of normal cats was 328.5 mOsms/L. Despite the accelerated TFBUT, conjunctivitis did not cause a statistically significant change in tear‐film osmolarity. The Tear Lab^TM Osmolarity System was easily used and well tolerated by the cats in the study.  相似文献   

Cuticular hydrocarbons in two parapatric species of ants and their hybrid     

Mohamed EL‐SHEHABY  Mohamed Sayed SALAMA  Elisabeth BRUNNER  Jürgen HEINZE 《Integrative zoology》2011,6(3):259-265

Discrimination between nestmates and non‐nestmates in social insects is thought to rely on the pattern of cuticular hydrocarbons. We investigated the cuticular hydrocarbon profiles of 2 parapatric sibling ant species, Temnothorax nylanderi (Förster, 1850) and Temnothorax crassispinus (Karavaiev, 1926), and their hybrid. We found that although the profiles show considerable similarities, a discriminant analysis based on the relative peak areas of cuticular hydrocarbons separates the 3 taxa. The profiles of hybrids were not consistently intermediate between those of the paternal species, suggesting either non‐additive interactions among the parental biosynthetic pathways or systematic differences in environment‐derived odor cues.  相似文献