Abstract This study was conducted with the aim of verifying simultaneous occurrence mycotoxin Citrinin (CIT) and Ochratoxin A (OTA) in popcorn grains consumed on a wide range throughout Iraq. It is enhanced by studying biologically combined effects these toxins compared to their effect separately. The results chromatographic analysis using HPLC technology detect mycotoxins analyzed samples show...

In Open Problems #3 (Summer 1991), I mentioned several analogues or extensions of Edmonds' Branching Theorem. Let 0 (G; r) be the minimum number of edges that must be deleted to make some vertex of a digraph G unreachable from r, and let (G; r) be the analogous parameter for vertex deletion. Edmonds proved that G has 0 (G; r) edge-disjoint r-branchings in G, where an r-branching is a subgraph i...

" truly exist for lymphocyte extravasa-tions, and future investigation will be needed to resolve this issue. Additionally, Bajenoff and Germain recently reported that the re-modeling of the conduit system that allows efficient delivery of soluble antigens from the periphery to FDC accompanies B-cell follicle development. It remains to be determined what role, if any, LT␣␤ expression by B cell m...

296 Letters to the Editor Fig. 1. (A) Bone marrow biopsy (Giemsa stain, high magnification) showing a neoplastic infiltrate composed predominantly of blastic cells with centroblastic morphology, with minor components composed of small centrocyte-like cells. These findings are indicative of diffuse large B-cell lymphoma with features suggestive of a centrofollicular origin. (B) Immunostaining wi...

At the initiation of an immune response, lymph nodes can double in size in a day and can be ten times their original size in five to seven days. Webster and colleagues report on page 1903 that dendritic cells, quite distinct from their function in antigen presentation, stimulate endothelial cell proliferation and vascular growth in the growing lymph node. Peripheral challenge (such as immunizat...

Theander, 1 in this issue, provides an important contribution with the article 'Lymphoid organization in labial sali-vary gland biopsies is a possible predictor for the development of malignant lym-phoma in primary Sjögren's syndrome'. It has been known for many years that ectopic germinal centres are present in minor salivary gland biopsies of a sub-population of patients with Sjögren's syndro...

CD22 is a membrane glycophosphoprotein found on nearly all healthy B-lymphocytes and most B-cell lymphomas. Recent in vitro studies have identified several anti-CD22 monoclonal antibodies (mAbs) that block the interaction of CD22 with its ligand. One of these mAbs, HB22.7, has been shown to effectively induce apoptosis in several B-cell lymphoma cell lines. Lymphoma xenograft studies with Raji-...

Figure 1. Peripheral blood smear showing flower or floret cell (arrow) with characteristic cerebriform nucleus associated with human T cell lymphotropic virus infection. Diagnosis: human T cell lymphotropic virus type 1 (HTLV-1) infection with associated Strongyloides stercoralis hyperin-fection and bacterial (i.e., vancomycin-resistant Enterococcus faecium) meningitis. HTLV-1 is a single-stran...