During the attachment of Agrobacterium tumefaciens to carrot tissue culture cells, the bacteria synthesize cellulose fibrils. We examined the role of these cellulose fibrils in the attachment process by determining the properties of bacterial mutants unable to synthesize cellulose. Such cellulose-minus bacteria attached to the carrot cell surface, but, in contrast to the parent strain, with whi...

BACKGROUND Evidence that diet is associated with breast cancer risk is inconsistent. Most studies have examined risks associated with specific foods and nutrients, rather than measures of overall diet. OBJECTIVE This study aimed to evaluate dietary patterns and their relation to breast cancer risk in a large cohort of women. DESIGN Data from 91,779 women in the California Teachers Study coh...

The endogenous levels of auxin and cytokinin in teratoma and unorganized tobacco (Nicotiana tabacum L. var Wisconsin #38) crown gall tumor tissues were determined. Teratoma tissues contain levels of auxin and cytokinin favorable for shoot formation, whereas unorganized tumors contain levels of auxin that suppress shoot formation. This conclusion is based upon the observation that when levels of...

The two vascular systems of our body are the blood and lymphatic vasculature. Our understanding of the cellular and molecular processes controlling the development of the lymphatic vasculature has progressed significantly in the last decade. In mammals, this is a stepwise process that starts in the embryonic veins, where lymphatic EC (LEC) progenitors are initially specified. The differentiatio...

A cloned tobacco crown gall tumor, 1595501, incited by A. tumefaciens strain 15955 was studied. Molecular analysis of the organization of the T-DNA by means of Southern transfer and hybridization techniques indicated that the 1595501 tumor has about 10 copies of TL DNA, five of which are complete TL DNA, whereas most octopine tumors have only one to two copies of complete TL DNA. Hybridization ...

Department of Biology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2 (A.M.E.Z., K.W., D.C.L.); Faculty of Science, Damanhour University, Damanhour 22516, Egypt (A.M.E.Z.); Institute of Crop Science and Resource Conservation, University of Bonn, D-53113 Bonn, Germany (M.S., A.J.M.); Max-Planck-Institute for Plant Breeding Research, Plant Proteomics Group, 50829 Cologne, Ger...

Two morphactins and three aminofluorenes initiated the formation of compact tissue nodules in hormone-dependent tobacco callus cultures. These nodules, upon subculture, behaved like partially transformed plant tumors. They grew on cytokinin-free media, while control callus and nonnodule tissue still required an exogenous cytokinin source. The data indicate that substituted fluorenes, including ...

Most animals store energy as long-chain triacylglycerols (lcTAGs). Trace amounts of acetylated triacylglycerols (acTAGs) have been reported in animals, but are not accumulated, likely because they have lower energy density than lcTAGs. Here we report that acTAGs comprise 36% of the neutral lipid pool of overwintering prepupae of the goldenrod gall fly, Eurosta solidaginis, while only 17% of the...

V i Differeiitial Systematies: WVilliam H. Womble 315 _ _ Technical Papers Contaminating Bacteria in Plant Tumor Tissues: William J. Robbins and Annette Hervey . ................................ 322 |k. The Isolation of Histoplasma Capsulatum from Soil in an Unused Silo: J. T. Grayston, C. G. Loosli, and E. R. Alexander . ............... .. 32.3 Differential Effects of Cerebellar Anterior Lobe ...