Actinide organometallic chemistry     

Marks TJ 《Science (New York, N.Y.)》1982,217(4564):989-997

The stoichiometric and catalytic chemistry of metal-organic compounds having actinide-to-carbon bonds is in a stage of rapid growth. Chemical, structural, and bonding characteristics have been identified which differ in interesting and informative ways from those of d-block transition element compounds.  相似文献   

Seasat visible and infrared radiometer     

McClain EP  Marks RA 《Science (New York, N.Y.)》1979,204(4400):1421-1424

Visual and infrared images produced by the Seasat visible and infrared radiometer (VIRR) are adequate for the identification of cloud, land, and water features. A statistical comparison of VIRR-derived sea-surface temperatures in a cloud-free region with a National Oceanic and Atmospheric Administration analysis based on various surface measurements taken in the same region showed agreement to +/- 1.7 degrees K root-mean-square.  相似文献   

Breast and ovarian cancer risks due to inherited mutations in BRCA1 and BRCA2     

King MC  Marks JH  Mandell JB;New York Breast Cancer Study Group 《Science (New York, N.Y.)》2003,302(5645):643-646

Risks of breast and ovarian cancer were determined for Ashkenazi Jewish women with inherited mutations in the tumor suppressor genes BRCA1 and BRCA2. We selected 1008 index cases, regardless of family history of cancer, and carried out molecular analysis across entire families. The lifetime risk of breast cancer among female mutation carriers was 82%, similar to risks in families with many cases. Risks appear to be increasing with time: Breast cancer risk by age 50 among mutation carriers born before 1940 was 24%, but among those born after 1940 it was 67%. Lifetime risks of ovarian cancer were 54% for BRCA1 and 23% for BRCA2 mutation carriers. Physical exercise and lack of obesity in adolescence were associated with significantly delayed breast cancer onset.  相似文献   

Polymer gate dielectric surface viscoelasticity modulates pentacene transistor performance     

Kim C  Facchetti A  Marks TJ 《Science (New York, N.Y.)》2007,318(5847):76-80

Nanoscopically confined polymer films are known to exhibit substantially depressed glass transition temperatures (Lg's) as compared to the corresponding bulk materials. We report here that pentacene thin films grown on polymer gate dielectrics at temperatures well below their bulk Tg's exhibit distinctive and abrupt morphological and microstructural transitions and thin-film transistor (TFT) performance discontinuities at well-defined growth temperatures. The changes reflect the higher chain mobility of the dielectric in its rubbery state and are independent of dielectric film thickness. Optimization of organic TFT performance must recognize this fundamental buried interface viscoelasticity effect, which is detectable in the current-voltage response.  相似文献   

The southern route "out of Africa": evidence for an early expansion of modern humans into Arabia     

Armitage SJ  Jasim SA  Marks AE  Parker AG  Usik VI  Uerpmann HP 《Science (New York, N.Y.)》2011,331(6016):453-456

The timing of the dispersal of anatomically modern humans (AMH) out of Africa is a fundamental question in human evolutionary studies. Existing data suggest a rapid coastal exodus via the Indian Ocean rim around 60,000 years ago. We present evidence from Jebel Faya, United Arab Emirates, demonstrating human presence in eastern Arabia during the last interglacial. The tool kit found at Jebel Faya has affinities to the late Middle Stone Age in northeast Africa, indicating that technological innovation was not necessary to facilitate migration into Arabia. Instead, we propose that low eustatic sea level and increased rainfall during the transition between marine isotope stages 6 and 5 allowed humans to populate Arabia. This evidence implies that AMH may have been present in South Asia before the Toba eruption.  相似文献   

Tritrichomonas foetus infection in purebred cats in Germany: prevalence of clinical signs and the role of co-infection with other enteroparasites     

Kuehner KA  Marks SL  Kass PH  Sauter-Louis C  Grahn RA  Barutzki D  Hartmann K 《Journal of Feline Medicine and Surgery》2011,13(4):251-258

The aim of this study was to determine the prevalence of Tritrichomonas foetus infection and associated clinical signs in purebred cats in Germany, to investigate the role of co-infection, and identify determinants of infection. Faecal specimens accompanied by epidemiological questionnaires were scored and collected from 230 purebred cats. Faeces were examined for trichomonads and other enteroparasites. The prevalence of T foetus was 15.7% among cats and 18.5% among catteries. An abnormal faecal score and history of diarrhoea were observed in 64% and 61% of T foetus-positive cats, respectively, and correlated significantly with infection. Co-infection, observed in 36% of T foetus-infected cats, was not associated with diarrhoea. Norwegian Forest cats were infected significantly more often than other breeds. No association was found with any environmental factors. This study demonstrated a high prevalence of symptomatic T foetus infections in purebred cats in Germany. Co-infection with other enteroparasites did not worsen clinical signs of trichomonosis.  相似文献   

Management, breeding, and health records from a captive colony of pekin robins (Leiothrix lutea), 2001 - 2010     

da Cruz CE  de Oliveira LG  Boabaid FM  Zimermann FC  Stein G  Marks F  Cerva C  Lieberknecht C  Canal CW  Driemeier D 《Journal of zoo and wildlife medicine》2011,42(3):451-459

Pekin robins (Leiothrix lutea) were once the most widely kept softbills in captivity. As a result of the Convention on the International Trade of Endangered Species of Fauna and Flora (CITES-1997), the worldwide trade of wild-caught pekin robins has been prohibited due to the depletion of native populations of this species. In Brazil, as in other countries, pekin robins imported prior to the enactment of the CITES have disappeared from aviaries because the end of the birds' natural life span has passed, and only very few captive-bred pekin robins now exist. While captive propagation fails to address the primary causes of wild bird population decline, it might help the recovery of populations of this species. This article presents records made over a 10-yr period of a captive colony of pekin robins. Emphasis is placed on the management of the flock, the ailments affecting the birds, and the findings associated with bird losses. The main causes of bird losses included rearing management failures and age-related disorders.  相似文献   

Production of 3-(1,2-epoxypropyl)-5,6-dihydro-5-hydroxy-6-methylpyran-2-one by Aspergillus ochraceus Wilhelm     

J H Moore  T P Murray  M E Marks 《Journal of agricultural and food chemistry》1974,22(4):697-698

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Fatal Herpesvirus hominis encephalitis in a white-handed gibbon   总被引：1，自引：0，他引：1  

E Ramsay  E L Stair  A E Castro  M I Marks 《Journal of the American Veterinary Medical Association》1982,181(11):1429-1430

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A skin grafting technique for horses     

M P Mackay-Smith  D Marks 《Journal of the American Veterinary Medical Association》1968,152(11):1633-1637

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