Will glasnost wash over u.s. Export controls?     

Hamilton DP 《Science (New York, N.Y.)》1990,248(4951):21

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Magnet lab: science to the highest bidder?     

Hamilton DP 《Science (New York, N.Y.)》1990,249(4971):851

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The Gelation of CO(2): A Sustainable Route to the Creation of Microcellular Materials     

Shi C  Huang Z  Kilic S  Xu J  Enick RM  Beckman EJ  Carr AJ  Melendez RE  Hamilton AD 《Science (New York, N.Y.)》1999,286(5444):1540-1543

Compounds with strong thermodynamic affinity for carbon dioxide (CO(2)) have been designed and synthesized that dissolve in CO(2), then associate to form gels. Upon removal of the CO(2), these gels produced free-standing foams with cells with an average diameter smaller than 1 micrometer and a bulk density reduction of 97 percent relative to the parent material.  相似文献   

A tentative vote for supersymmetry     

Hamilton DP 《Science (New York, N.Y.)》1991,253(5017):272

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Systemic Control of Cherry Leaf-Spot Fungus by Foliar Sprays of Actidione Derivatives     

Hamilton JM  Szkolnik M  Sondheimer E 《Science (New York, N.Y.)》1956,123(3209):1175-1176

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"REMARKS ON SULAIMAN'S THEORY OF RELATIVITY"     

Sulaiman SM  Hamilton DR 《Science (New York, N.Y.)》1935,82(2131):413-415

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Copulatory vocalizations of chacma baboons (Papio ursinus), gibbons (Hylobates hoolock), and humans     

W J Hamilton  P C Arrowood 《Science (New York, N.Y.)》1978,200(4348):1405-1409

The copulatory vocalizations of female baboons (Papio ursinus) are more complex than those of female gibbons (Hylobates hoolock) or human females. Adult males of all these species begin calling later than the female, but subordinate baboon males do not call. Copulatory vocalizations may serve to mutually stimulate the mating partners or to incite male competition.  相似文献   

Endotoxin-stimulated opioid peptide secretion: two secretory pools and feedback control in vivo   总被引：3，自引：0，他引：3  

D B Carr  R Bergland  A Hamilton  H Blume  N Kasting  M Arnold  J B Martin  M Rosenblatt 《Science (New York, N.Y.)》1982,217(4562):845-848

Small doses of endotoxin evoked a dramatic biphasic response of opioid peptide secretion into blood in sheep. The first phase began within minutes and coincided with a brief hypertensive response to endotoxin well before the appearance of fever or hypotension. The ratio of beta-endorphin to beta-lipotropin fell abruptly at the onset of the second phase of release, suggesting early depletion of a pool rich in beta-endorphin and subsequent emergence of a pool rich in unprocessed precursor. The concentration of cerebrospinal fluid opioids increased tenfold during the second phase. Naloxone administration augmented endotoxin-induced opioid secretion in both early and late phases, suggesting a short-loop feedback regulation of stress-induced endorphin secretion.  相似文献   

Tumor-promoting phorbol esters stimulate hematopoietic colony formation in vitro   总被引：6，自引：0，他引：6  

R K Stuart  J A Hamilton 《Science (New York, N.Y.)》1980,208(4442):402-404

Tumor-promoting phorbol esters stimulated mouse bone marrow cells to form myeloid colonies in agar cultures without added colony-stimulating factors. The colony-stimulating ability of various phorbol esters correlated well with their ability to promote skin tumors in vivo. These results suggest that phorbol esters mimic the action of specific colony-stimulating factors that regulate growth.  相似文献   

Gene amplification of c-myc and N-myc in small cell carcinoma of the lung   总被引：17，自引：0，他引：17  

A J Wong  J M Ruppert  J Eggleston  S R Hamilton  S B Baylin  B Vogelstein 《Science (New York, N.Y.)》1986,233(4762):461-464

The relationship of the copy numbers of the c-myc and N-myc oncogenes to tumor formation and progression was studied in small cell carcinoma of the lung. When 96 neoplastic lesions from 45 patients were examined, these lesions could be grouped into three categories: high copy (tumors with greater than 3 copies of the N-myc or c-myc gene per haploid genome), middle copy (1.5 to 3 copies per genome), and normal copy. Fourteen of the patients had middle copy tumors, but this was almost always a result of chromosome duplication rather than the amplification of a small genetic locus. In contrast, five patients had high copy tumors, with the increased copy number in each case due to gene amplification. The amplification did not occur in a heterogeneous fashion within individual patients, since all metastatic lesions from patients with high copy lung tumors were also high copy, while none of 41 metastatic lesions from the other patients were high copy. These data suggest that gene amplification is an important step in neoplastic growth in a subset of patients with small cell carcinoma of the lung and that this genetic event occurs relatively early (before metastasis) in this subset.  相似文献