A close-up look at Io from Galileo's near-infrared mapping spectrometer     

Lopes-Gautier R  Douté S  Smythe WD  Kamp LW  Carlson RW  Davies AG  Leader FE  McEwen AS  Geissler PE  Kieffer SW  Keszthelyi L  Barbinis E  Mehlman R  Segura M  Shirley J  Soderblom LA 《Science (New York, N.Y.)》2000,288(5469):1201-1204

Infrared spectral images of Jupiter's volcanic moon Io, acquired during the October and November 1999 and February 2000 flybys of the Galileo spacecraft, were used to study the thermal structure and sulfur dioxide distribution of active volcanoes. Loki Patera, the solar system's most powerful known volcano, exhibits large expanses of dark, cooling lava on its caldera floor. Prometheus, the site of long-lived plume activity, has two major areas of thermal emission, which support ideas of plume migration. Sulfur dioxide deposits were mapped at local scales and show a more complex relationship to surface colors than previously thought, indicating the presence of other sulfur compounds.  相似文献   

The Spirit Rover's Athena science investigation at Gusev Crater, Mars     

Squyres SW  Arvidson RE  Bell JF  Brückner J  Cabrol NA  Calvin W  Carr MH  Christensen PR  Clark BC  Crumpler L  Des Marais DJ  D'Uston C  Economou T  Farmer J  Farrand W  Folkner W  Golombek M  Gorevan S  Grant JA  Greeley R  Grotzinger J  Haskin L  Herkenhoff KE  Hviid S  Johnson J  Klingelhöfer G  Knoll A  Landis G  Lemmon M  Li R  Madsen MB  Malin MC  McLennan SM  McSween HY  Ming DW  Moersch J  Morris RV  Parker T  Rice JW  Richter L  Rieder R  Sims M  Smith M  Smith P  Soderblom LA  Sullivan R  Wänke H  Wdowiak T  Wolff M  Yen A 《Science (New York, N.Y.)》2004,305(5685):794-799

The Mars Exploration Rover Spirit and its Athena science payload have been used to investigate a landing site in Gusev crater. Gusev is hypothesized to be the site of a former lake, but no clear evidence for lacustrine sedimentation has been found to date. Instead, the dominant lithology is basalt, and the dominant geologic processes are impact events and eolian transport. Many rocks exhibit coatings and other characteristics that may be evidence for minor aqueous alteration. Any lacustrine sediments that may exist at this location within Gusev apparently have been buried by lavas that have undergone subsequent impact disruption.  相似文献   

Detoxication of drugs and other foreign compounds by liver microsomes     

BRODIE BB  AXELROD J  COOPER JR  GAUDETTE L  LA DU BN  MITOMA C  UDENFRIEND S 《Science (New York, N.Y.)》1955,121(3147):603-604

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甜菜总DNA不同提取方法的研究   总被引：2，自引：0，他引：2  

腊萍  罗淑萍  章建新  麻浩  刘娜  刘焕霞  赵图强 《新疆农业大学学报》2006,29(2):43-46

采用CTAB法、SDS法、改进CTAB法和改进SDS法提取甜菜总DNA,并对提取得到的DNA进行质量鉴定和PCR扩增效果检测.结果表明：用改进的CTAB法提取的甜菜总DNA OD260/OD280在1.8左右,DNA纯度好,产率高,CTAB法和改进的SDS法产率次之,SDS法最低.同时对改进的CTAB法的提取条件进行优化,即用5.0 mL细胞提取液,0.8 mL无水乙醇, 0.6倍体积的异丙醇,可从1.0 g甜菜叶片中提取到高质量高纯度的DNA 764 μg/g.  相似文献   

Long-term nutritional effects on the primary liver and kidney metabolism in rainbow trout, Oncorhynchus mykiss (Walbaum): adaptive response to a high-protein/non-carbohydrate diet and starvation of glucose 6-phosphate dehydrogenase activity     

M.J. SÁNCHEZ-MUROS  L. GARCÍA-REJÓN  J.A. LUPIÁÑEZ  M. DE LA  HIGUERA 《Aquaculture Nutrition》1995,1(4):213-220

The adaptive response of the kinetics of glucose 6-phosphate dehydrogenase (G6PDH) was studied in trout liver and kidney after feeding (control or high-protein/non-carbohydrate diet) or starving for 30 days, as well as influences on growth and other nutritive parameters. Typical Michaelis-Menten kinetics were found for the hepatic catalysis of G6PDH under all conditions studied, without evidence of sigmoidicity. The administration of a high-protein/non-carbohydrate diet (61.0% protein, 7.9% lipids) produced no significant changes in specific activity or other kinetic parameters of the liver enzyme. This nutritional situation caused a significant daily increase in relative growth (20%) and feed efficiency (13.5%), as well as a 13% decrease in the protein-conversion efficiency, with respect to the control diet (46% protein, 8% lipids, 22% carbohydrates). On the other hand, long-term starvation (30 days), as a lipolytic condition, significantly decreased the activity and catalytic efficiency of hepatic G6PDH, by almost 45%, without significant changes in the K_m and activity-ratio values. These changes agree with a fall in the intracellular concentration of the enzyme as a consequence of a protein-repression process. The activity of the renal G6PDH was less than in the liver of control fish, and no variation in kinetics was found under the high-protein diet or starvation. This behaviour clearly demonstrates that the kidney pentose-phosphate pathway showed no adaptive response in relation to synthesis of fatty acids and other lipids.  相似文献   

镉与微量元素在小麦吸收过程中的相互影响     

姚晨  贾睿琪  腊贵晓  王宁  陆夏梓  郭子昂  龚子阳  赵艳阳  郭虹妤  李烜桢 《农业环境科学学报》2022,41(6):1175-1183

为开发小麦生理阻控降Cd材料,以郑麦1354和郑麦1860为供试小麦品种,通过水培试验方法,研究了不同Zn（1~10μmol·L^-1）和Mn （1~10 μmol·L^-1）供应量对小麦生物量和Cd/Zn/Mn含量的影响,以及不同Cd （1~50 μmol·L^-1）胁迫水平对小麦生物量和Cd/Zn/Mn含量的影响。结果表明,5 μmol·L^-1 Zn和10 μmol·L^-1 Mn处理显著提高了两种小麦的生物量。Mn （1~10 μmol·L^-1）处理使郑麦1354和郑麦1860小麦地上部Cd含量分别降低了22.8%~29.4%和15.2%~17.5%,地下部Cd含量分别降低了25.7%~30.0%和28.6%~31.6%,Zn（1~10 μmol·L^-1）处理使郑麦1354和郑麦1860小麦地下部Cd含量分别降低了20.3%~34.3%和18.9%~43.0%,此外还使郑麦1354地上部的Cd含量降低了10.1%~13.1%。不同Cd胁迫（1~50 μmol·L^-1）均有提高小麦生物量的趋势。随着Cd胁迫水平的提高,两个品种地上部和地下部Cd含量均呈升高趋势,地下部Zn含量呈先增加后降低的趋势,Mn含量呈逐渐降低的趋势,表明在小麦吸收金属元素过程中,Cd与Mn存在竞争关系,而与Zn的关系则较为复杂,且其竞争程度因品种而异。研究表明,适度提高Mn和Zn供应能显著降低小麦植株Cd含量,因此Mn和Zn是实现小麦降Cd的有效生理阻控材料。  相似文献   

Sedation of hyperthyroid cats with subcutaneous administration of a combination of alfaxalone and butorphanol     

S Ramoo  LA Bradbury  GA Anderson  LA Abraham 《Australian veterinary journal》2013,91(4):131-136

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Methicillin‐resistant Staphylococcus aureus: an issue for veterinary hospitals     

JL Allen  LA Abraham  K Thompson  GF Browning 《Australian veterinary journal》2013,91(6):215-219

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Acute chylous peritonitis associated with acute pancreatitis in a Staffordshire Bull Terrier     

K Lott  C Mansfield  LA Abraham 《New Zealand veterinary journal》2013,61(2):125-126

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Pup Growth Rates and Breeding Female Weight Changes in Two Populations of Captive Bred Degus (Octodon degus), a Precocial Caviomorph Rodent     

CV Long  LA Ebensperger 《Reproduction in domestic animals》2010,45(6):975-982

Caviomorph rodents are renowned for comparatively long gestations and producing relatively precocious offspring. The degu (Octodon degus) is one such caviomorph, originating in central Chile and providing communal pup care within wild groups. Reported are pup growth data for two populations of captive bred degus in Britain and Chile (representing wild populations), for the first time analysing pup development over the postpartum and weaning period in detail. Pups in both colonies were found to be similarly precocial at birth as assessed by open eyes and presence of full body hair. Degu pups in the British colonies put on weight at a rate of 2–3 g/day, while pups in the Chilean colonies put on weight at a rate of 1–2 g/day over the first 14 days. At birth, individual neonates weighed 5 ± 1% of maternal mass for the British sample and 6 ± 0.5% for the Chilean sample. Sexual dimorphism occurred in the weight and growth rates of pups in both samples, despite the lack of sexual dimorphism in adults of the species. Data for breeding female weight changes were also analysed, providing the first reported observations for this crucial period. Pregnant female weight gain was found to vary over the course of gestation, and post partum weight changes varied significantly between breeding females in accordance with litter size.  相似文献