Water at - 72{degrees} C     

Heilemann JJ 《Science (New York, N.Y.)》1948,108(2798):157-158

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Abnormal Sex Behavior in a Dog     

H. D. Pritchett 《Canadian journal of veterinary research》1940,4(11):329-330

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SOLUTIONS OF CHLOROPHYLL IN SALT WATER     

Shafer J 《Science (New York, N.Y.)》1940,91(2372):580

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The genesis of the diamond     

Diller JS 《Science (New York, N.Y.)》1886,8(195):392

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Über Fichtenvorverjüngung mittels Unterpflanzung     

Fürstl. Reuß Oberförster Ph. Sieber 《European Journal of Forest Research》1909,31(12):631-640

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Bücheranzeigen     

Funk  Fabricius  R. Lrendelenburg  B. Mantel  Dr. Rohmeder  K. Escherich  Lukinger 《European Journal of Forest Research》1940,62(8):182-187

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Wie wirkt Dinitro-ortho-kresol auf Insekten?     

F. Stellwaag  Th. Staudenmayer 《Journal of pest science》1940,16(4):37-39

Ohne Zusammenfassung  相似文献   

Die Widerstandsfähigkeit der Raupe der Heumotte (Ephestia elutella Hb.) gegen Frost     

Dr. Dr. Sigbert Mehl 《Journal of pest science》1940,16(7):78-83

Ohne Zusammenfassung Mit 4 Abbildungen  相似文献   

Na/K-ATPase activity during larval development in the giant freshwater prawn Macrobrachium rosenbergii and the effects of salinity on survival rates     

Do Thi  Thanh HUONG  Vidya  JAYASANKAR  Safiah  JASMANI  Hisako  SAIDO-SAKANAKA  Andrew J.  WIGGINTON  Marcy N.  WILDER 《Fisheries Science》2004,70(3):518-520

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Detection, identification and significance of phytoplasmas in grasses in northern Australia     

K. R. Blanche‡  L. T. T. Tran-Nguyen  K. S. Gibb† 《Plant pathology》2003,52(4):505-512

Sugarcane yields have been severely reduced by white leaf and grassy shoot phytoplasma diseases in many parts of Asia. Australian sugarcane crops are not known to be affected by these diseases, but plant pathogenic phytoplasmas found in other introduced and native grasses in northern Australia could pose a serious threat to the Australian sugarcane industry. To further evaluate this threat, leaves from plants of 20 grass species, with and without symptoms, were collected during field surveys in northern Australia and tested to determine whether phytoplasmas were present and whether symptoms were reliable indicators of phytoplasma presence. Molecular tools were used to detect and characterize phytoplasmas. Four different phytoplasmas were found in seven grass species known to grow near healthy sugarcane crops. All the phytoplasmas were closely related to sugarcane white leaf phytoplasma (SCWL), one of the phytoplasmas that causes disease in sugarcane in Asia. Four of the host plant species and two of the phytoplasmas were new records. The relationship between symptoms and phytoplasma presence was poor. Because some plants with symptoms tested negative for phytoplasmas, a series of surveys was carried out in which flowers, leaves, roots and stems of two known host plant species, Whiteochloa cymbiformis and Sorghum stipoideum, were tested separately on nine occasions during two wet seasons. This was done to investigate the distribution of phytoplasmas within plants over time. Results showed that spatial and temporal variation of phytoplasmas occurred in these two host plant species. Hence, evaluation of disease distribution within a region requires repeated testing of all plant parts from plants without symptoms, as well as those with symptoms. To date, there is no report of a vector capable of transmitting to Australian sugarcane the phytoplasmas found in grasses in this study. If one is present, or occurs in the future, then native and introduced grasses could constitute a large reservoir of phytoplasma for vectors to draw on. This work provides an early warning for the sugarcane industry that the potential for infection exists.  相似文献