THE HOT BLAST IN MAKING IRON     

Richards RH 《Science (New York, N.Y.)》1884,3(50):72-73

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ECONOMICS IN MANUFACTURES     

Thurston RH 《Science (New York, N.Y.)》1899,9(225):583-586

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A NEGLECTED DEPARTMENT     

Thurston RH 《Science (New York, N.Y.)》1900,11(273):473-474

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THE SECOND RECORD FOR BLANDING'S TURTLE IN CONCORD,MASS     

Howe RH 《Science (New York, N.Y.)》1911,34(870):272

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A PROPOSED CLASSIFICATION OF THE ATTITUDE OF GEOLOGIC SURFACES     

Johnson RH 《Science (New York, N.Y.)》1915,42(1083):450-452

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THE ROLE OF NIGHT TEMPERATURE IN PLANT PERFORMANCE     

Roberts RH 《Science (New York, N.Y.)》1943,98(2542):265

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Gibberellin A(4/7) promotes cone production on potted grafts of eastern white pine     

Ho RH  Schnekenburger F 《Tree physiology》1992,11(2):197-203

Potted grafts of eastern white pine (Pinus strobus L.) growing in a heated greenhouse were sprayed weekly with 0, 250 or 500 mg l(-1) of gibberellin A(4/7) for four different 6-week periods between mid-May and mid-September. At different periods, gibberellin A(4/7) concentrations of 250 and 500 mg l(-1) were effective in promoting pollen- and seed-cone production. Spraying in May and June, during the period of rapid terminal shoot elongation, significantly increased pollen-cone production, whereas spraying in August and September, about a month after terminal shoot elongation, significantly increased seed-cone production.  相似文献   

Tree water use and rainfall partitioning in a mature poplar-pasture system     

Guevara-Escobar A  Edwards WR  Morton RH  Kemp PD  Mackay AD 《Tree physiology》2000,20(2):97-106

Traditionally, poplars (Populus) have been planted to control erosion on New Zealand's hill-slopes, because of their capacity to dry out and bind together the soil, by reducing effective rainfall and increasing evapotranspiration and soil strength. However, the effect of widely spaced poplars on the partitioning of soil water and rainfall has not been reported. This study determined rainfall partitioning for 18 mid-spring days in a mature P. deltoides (Bart. ex Marsh, Clone I78)-pasture association (37 stems per hectare, unevenly spaced at 16.4 +/- 0.4 m) and compared it with a traditional open pasture system in grazed areas of a hill environment. Tree transpiration was measured by the heat pulse technique. A time-driven mathematical model was used to set a zero offset, adjust anomalous values and describe simultaneous sap velocity time courses of trees. The model showed that daylight sap flow velocities can be represented with a nonlinear Beta function (R(2) > 0.98), and differences in the parameters representing the initiation, duration and conformation of the sap velocity can be tested statistically to discern tree transpiration differences during the day. Evapotranspiration was greater for the poplar-pasture association than for the open pasture (2.7-3.0 versus 2.2 mm day(-1)). The tree canopy alone contributed 0.92 mm day(-1) as transpiration and 1.37 mm day(-1) as interception, whereas evapotranspiration of the pasture understory was only 0.4-0.6 mm day(-1). Despite the higher water use of the poplar-pasture association, soil water in the 0-300 mm soil stratum was higher than, or similar to, that of the open pasture. Tree shading decreased evapotranspiration and pasture accumulation under the trees.  相似文献   

Uptake and translocation of non-ionised pesticides in the emergent aquatic plant parrot feather Myriophyllum aquaticum     

de Carvalho RF  Bromilow RH  Greenwood R 《Pest management science》2007,63(8):798-802

The uptake of four (14)C-labelled non-ionised compounds, the methyl carbamoyloxime insecticide/nematicide oxamyl and three model phenylureas, from solution by rooted stems of the aquatic plant parrot feather [Myriophyllum aquaticum (Vell.) Verdc], together with translocation to the emergent shoots, was measured over periods of 24 and 48 h. Uptake into the submerged tissues of roots and stem base could be ascribed to two processes: movement into the aqueous phase of cells and then partitioning onto the plant solids. This latter process was related to lipophilicity (as measured by the l-octanol/water partition coefficient, K(ow)) and gave rise to high uptake rates of the most lipophilic compounds. Translocation to shoots was passive and was optimal at log K(ow) approximately 1.8, at which the efficiency of translocation of compound was about 40% of that of water. This optimum log K(ow) was identical to that observed previously in barley, although the translocation efficiency was somewhat less in parrot feather. Solvation parameters were applied to model uptake and translocation of a set of ten compounds by barley with the particular objective of understanding why translocation efficiency is lower at log K(ow) > 1.8.  相似文献   

Quantification and persistence of recombinant DNA of Roundup Ready corn and soybean in rotation     

Lerat S  Gulden RH  Hart MM  Powell JR  England LS  Pauls KP  Swanton CJ  Klironomos JN  Trevors JT 《Journal of agricultural and food chemistry》2007,55(25):10226-10231

The presence of the recombinant cp4 epsps gene from Roundup Ready (RR) corn and RR soybean was quantified using real-time PCR in soil samples from a field experiment growing RR and conventional corn and soybean in rotation. RR corn and RR soybean cp4 epsps persisted in soil for up to 1 year after seeding. The concentration of recombinant DNA in soil peaked in July and August in RR corn and RR soybean plots, respectively. A small fraction of soil samples from plots seeded with conventional crops contained recombinant DNA, suggesting transgene dispersal by means of natural process or agricultural practices. This research will aid in the understanding of the persistence of recombinant DNA in agricultural cropping systems.  相似文献