Objective: The purpose of this study was to compare unfractionated heparin therapy to the low molecular weight heparin, enoxaparin sodium, and their effects on bone mineral density over the course of pregnancy.Study design: Pregnant patients whose condition required thromboprophylaxis were recruited in this prospective randomized controlled trial and were assigned to receive either unfractionated heparin therapy or low molecular weight heparin therapy, Bone mineral density was measured by dual energy x-ray absorptiometry at the proximal femur on enrollment and again shortly after delivery.Results: One hundred twenty women were enrolled, and 98 women completed the study. There was no difference in the change in bone mineral density at the femoral neck (P = .054) or total proximal femur (P = .584) between groups. Only I of 40 patients (2.5%) who received unfractionated heparin therapy and I of 49 patients (2.0%) who received low molecular weight heparin therapy (P = 1.0) experienced bone loss of >= 10% at the femoral neck.Conclusion: In this study, the incidence of clinically significant bone loss (>= 10%) in the femur in women who received thromboprophylaxis in pregnancy is approximately 2% to 2.5% and appears to be similar, regardless of whether the patient receives low molecular weight heparin therapy or unfractionated heparin therapy. (c) 2006 Mosby, Inc. All rights reserved.

FtsI, also known as penicillin‐binding protein 3, is a transpeptidase required for the synthesis of peptidoglycan in the division septum of the bacterium, Escherichia coli. FtsI has been estimated to be present at about 100 molecules per cell, well below the detection limit of immunoelectron microscopy. Here, we confirm the low abundance of FtsI and use immunofluorescence microscopy, a highly sensitive technique, to show that FtsI is localized to the division site during the later stages of cell growth. FtsI was also sometimes observed at the cell pole; polar localization was not anticipated and its significance is not known. We conclude (i) that immunofluorescence microscopy can be used to localize proteins whose abundance is as low as approximately 100 molecules per cell; and (ii) that spatial and temporal regulation of FtsI activity in septum formation is achieved, at least in part, by timed localization of the protein to the division site.

Alkaline phosphatase fusions have been used to analyse plasmid- or phage-carried genes from the two-minute region of the Escherichia coli chromosome. These studies have revealed the following: 1) Bacteriophage lambda carries two genes for cell envelope proteins, lom and bor, that are expressed in lysogens and probably contribute to the pathogenicity of its E. coli host. 2) The ftsQ and ftsl gene products are integral proteins of the cytoplasmic membrane with small cytoplasmic domains and large periplasmic domains. 3) The ftsQ and ftsl gene products are made in very small amounts, on the order of 25 molecules per cell. 4) The ftsQ gene product is essential for cell growth and is required throughout the formation of the cell septum. 5) An open reading frame just upstream from ftsl, thought to be involved in cell division, is expressed and probably codes for a cytoplasmic membrane protein.