Reaction to the cotton root-knot nematodes and the pollen and seed fertility of kenaf-roselle (Hibiscus cannabinus × H. sabdariffa) allohexaploids     

F. D. Wilson  W. C. Adamson 《Euphytica》1970,19(3):349-355

Summary Allohexaploid (2n = 108) F₂ and F₃ interspecific hybrids ofHibiscus cannabinus × H. sabdariffa were intermediate in their resistance to the cotton root-knot nematode (Meloidogyne incognita acrita Chitwood 1949) between their moderately resistant, tetraploid parent, roselle (Hibiscus sabdariffa L.) and their susceptible, diploid parent, kenaf (H. cannabinus L.). Whether or not this resistance, as measured by the amount of root galling, is sufficient to be of practical importance is not known at present. However, results were encouraging enough to suggest further testing of the hybrids for agronomic potential, stability, fertility, and response to root-knot, and other parasitic nematodes that attack this potentially important paper-pulp crop.Cooperative investigations of the Crops Research Division, Agricultural Research Service, US Department of Agriculture, and the Texas Agricultural Experiment Station.  相似文献   

Growth of SiO2 at room temperature with the use of catalyzed sequential half-reactions     

JW Klaus  O Sneh  SM George 《Science (New York, N.Y.)》1997,278(5345):1934-1936

Films of silicon dioxide (SiO2) were deposited at room temperature by means of catalyzed binary reaction sequence chemistry. The binary reaction SiCl4 + 2H2O --> SiO2 + 4HCl was separated into SiCl4 and H2O half-reactions, and the half-reactions were then performed in an ABAB ellipsis sequence and catalyzed with pyridine. The pyridine catalyst lowered the deposition temperature from >600 to 300 kelvin and reduced the reactant flux required for complete reactions from approximately 10(9) to approximately 10(4) Langmuirs. Growth rates of approximately 2.1 angstroms per AB reaction cycle were obtained at room temperature for reactant pressures of 15 millitorr and 60-second exposure times with 200 millitorr of pyridine. This catalytic technique may be general and should facilitate the chemical vapor deposition of other oxide and nitride materials.  相似文献   

Design and chemical synthesis of a homogeneous polymer-modified erythropoiesis protein     

Kochendoerfer GG  Chen SY  Mao F  Cressman S  Traviglia S  Shao H  Hunter CL  Low DW  Cagle EN  Carnevali M  Gueriguian V  Keogh PJ  Porter H  Stratton SM  Wiedeke MC  Wilken J  Tang J  Levy JJ  Miranda LP  Crnogorac MM  Kalbag S  Botti P  Schindler-Horvat J  Savatski L  Adamson JW  Kung A  Kent SB  Bradburne JA 《Science (New York, N.Y.)》2003,299(5608):884-887

We report the design and total chemical synthesis of "synthetic erythropoiesis protein" (SEP), a 51-kilodalton protein-polymer construct consisting of a 166-amino-acid polypeptide chain and two covalently attached, branched, and monodisperse polymer moieties that are negatively charged. The ability to control the chemistry allowed us to synthesize a macromolecule of precisely defined covalent structure. SEP was homogeneous as shown by high-resolution analytical techniques, with a mass of 50,825 +/-10 daltons by electrospray mass spectrometry, and with a pI of 5.0. In cell and animal assays for erythropoiesis, SEP displayed potent biological activity and had significantly prolonged duration of action in vivo. These chemical methods are a powerful tool in the rational design of protein constructs with potential therapeutic applications.  相似文献   

Ionic concentrations in a blanket peat bog in northern England and correlations with deposition and climate variables   总被引：1，自引：0，他引：1  

J. K. Adamson  W. A. Scott  A. P. Rowland  & G. R. Beard 《European Journal of Soil Science》2001,52(1):69-79

Soil solution was collected to identify seasonal trends in its chemistry and to examine relationships between the concentrations of ions and variables that may control them. Samples were collected fortnightly at 10 cm and 50 cm depth in a blanket peat soil at Moor House–Upper Teesdale National Nature Reserve in the northern Pennine uplands of England. Dissolved organic carbon at 10 cm peaked each summer and correlated most strongly with temperature. At both depths Na⁺ and Cl^– were the dominant ions, reflecting the oceanic climate. Over the 3‐year sampling period, concentrations of the principal anions and cations at 10 cm varied little except during the autumns of 1994 and 1995 following unusually dry summers. At these times concentrations of SO₄^2–‐S increased from < 3 μmol to a maximum of 430 μmol and were balanced by smaller increases in Na⁺, Mg²⁺, Ca²⁺ and H⁺. The SO₄^2– concentration at 10 cm was most strongly correlated with depth to the water Table 3 weeks prior to sampling. At 50 cm depth in the peat a small increase in SO₄^2– occurred only during the autumn of 1995, and the concentration of SO₄^2– at this depth correlated most strongly with that at 10 cm. At neither depth were there any strong correlations with deposition. The increase in H⁺ concentration associated with the peak in SO₄^2– at 10 cm depth represents a fall in pH from usual values around 4.2 to 3.5.

Table 3. Deposition flux of ions in bulk precipitation at Moor House from weekly samplings 1994 to 1996 in kg ha^?1 year^?1. The UK flux is derived from 32 sites of the United Kingdom Precipitation Composition Monitoring Network 1992 to 1994 and the standard deviation (SD) relates to the variation between these sites ( Review Group on Acid Rain, 1997 )

	Moor House flux	UK flux	UK SD
H+	0.31	0.26	0.10
Ca2+	4.07	3.58	1.86
Mg2+	3.37	3.62	2.62
K+	1.54
Fe2+	0.73
Al3+	0.44
Na+	29.32	25.77	19.27
Cl–	51.14	45.96	32.39
NO3–‐N	4.01	3.20	1.05
NH4+‐N	4.85	3.63	1.74
SO42–‐S	8.98	7.98	3.09
PO43–‐P	0.01

Citing Literature

Volume 52 , Issue 1 March 2001

Pages 69-79  相似文献   

Use of a laryngeal mask airway in rabbits during isoflurane anesthesia     

L  Bateman  JW Ludders  RD Gleed  HN Erb 《Veterinary anaesthesia and analgesia》2003,30(2):117-117

The purpose of this study was to find out if an LMA (#1 LMA‐Classic) would provide a better airway than a face mask in spontaneously breathing anesthetized rabbits, and to test if it could be used for mechanically controlled ventilation. Sixteen rabbits (4.1 ± 0.8 kg, mean ± SD) were assigned randomly to three treatment groups; face mask with spontaneous ventilation (FM‐SV; n = 5), LMA with spontaneous ventilation (LMA‐SV; n = 5), and LMA with controlled ventilation (LMA‐CV; n = 6). Rabbits were anesthetized in dorsal recumbency using a circle circuit at constant ET isoflurane (2.3%, Datex airway gas monitor) and constant rectal temperature (38.85 °C) for 2 hours. PaCO₂, PaO₂, minute volume, tidal volume (Wright's respirometer), and Pe CO₂ were measured at 15 minute intervals. Two individuals in the FM‐SV group had PaCO₂ >100 mm Hg (>13.3 kPa). One rabbit in the FM‐SV had PaO₂ <80 mm Hg (<10.7 kPa). All FM‐SV rabbits showed signs of airway obstruction and two were withdrawn from the study at 45 and 90 minutes, respectively, because of cyanosis. Tidal volume could not be measured in the FM‐SV group. No signs of airway obstructions were observed in either of the LMA groups. Four rabbits in the LMA‐CV group developed gastric tympany, and one of these refluxed after 110 minutes. The significance of differences between the two spontaneously breathing groups and between the two LMA groups were measured using Wilcoxon's rank sum test (with significance assumed at p < 0.05). There were no statistical differences between FM‐SV and LMA‐SV in any variable tested. PaCO₂ and Pe ′CO₂ were less in the LMA‐CV group than in the LMA‐SV group, while PaO₂, tidal volume, and minute volume were all more. We conclude that biologically, the LMA provides a better airway than the face mask during spontaneous breathing and that it can be used for IPPV, but that gastric tympany is likely to occur during IPPV.  相似文献   

Aetiology and Endocrinology of Pseudopregnancy in the Goat     

MAM Taverne  JW Hesselink    MM Bevers  HA van  Oord JE Kornalijnslijper 《Reproduction in domestic animals》1995,30(4):228-230

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Two clinical manifestations of furazolidone toxicity in calves     

JW FINNIE 《Australian veterinary journal》1992,69(1):21-21

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Tracking the long-term decline and recovery of an isolated population     

RL Westemeier  JD Brawn  SA Simpson  TL Esker  RW Jansen  JW Walk  EL Kershner  JL Bouzat  KN Paige 《Science (New York, N.Y.)》1998,282(5394):1695-1698

Effects of small population size and reduced genetic variation on the viability of wild animal populations remain controversial. During a 35-year study of a remnant population of greater prairie chickens, population size decreased from 2000 individuals in 1962 to fewer than 50 by 1994. Concurrently, both fitness, as measured by fertility and hatching rates of eggs, and genetic diversity declined significantly. Conservation measures initiated in 1992 with translocations of birds from large, genetically diverse populations restored egg viability. Thus, sufficient genetic resources appear to be critical for maintaining populations of greater prairie chickens.  相似文献   

Synthesis of large arrays of well-aligned carbon nanotubes on glass     

ZF Ren  ZP Huang  JW Xu  JH Wang  P Bush  MP Siegal  PN Provencio 《Science (New York, N.Y.)》1998,282(5391):1105-1107

Free-standing aligned carbon nanotubes have previously been grown above 700 degreesC on mesoporous silica embedded with iron nanoparticles. Here, carbon nanotubes aligned over areas up to several square centimeters were grown on nickel-coated glass below 666 degreesC by plasma-enhanced hot filament chemical vapor deposition. Acetylene gas was used as the carbon source and ammonia gas was used as a catalyst and dilution gas. Nanotubes with controllable diameters from 20 to 400 nanometers and lengths from 0. 1 to 50 micrometers were obtained. Using this method, large panels of aligned carbon nanotubes can be made under conditions that are suitable for device fabrication.  相似文献   

A review of potential biodiversity indicators for application in British forests   总被引：6，自引：0，他引：6  

Ferris  R; Humphrey  JW 《Forestry》1999,72(4):313-328

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