TargeTron Inactivation of Chlamydia trachomatis Results in a Lipopolysaccharide 3-Deoxy-d-Manno-Oct-2-Ulosonic Acid-Deficient Strain That Is Cytotoxic for Cells.

All members of the family Chlamydiaceae have lipopolysaccharides (LPS) that possess a shared carbohydrate trisaccharide antigen, 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo) that is functionally uncharacterized. A single gene, genus-specific epitope (), is responsible for attaching the tri-Kdo to lipid IVA. To investigate the function of Kdo in chlamydial host cell interactions, we made a -null strain (L2Δ) by using TargeTron mutagenesis.

Social Determinants of Health: Associations Between Dichotomous Versus Dimensional Scores, Neuropsychological Test Performance, and Psychiatric Symptoms.

This study examined the utility of dichotomous versus dimensional scores across two measures of social determinants of health (SDOH) regarding their associations with cognitive performance and psychiatric symptoms in a mixed clinical sample of 215 adults referred for neuropsychological evaluation ( = 43.91, 53.5% male, 44.

Do demographic factors influence detection of invalid neuropsychological test performance using common performance validity tests? A multisite investigation.

Objective: This study examined the extent to which demographic variables (i.e., age, education, premorbid IQ, sex, ethnoracial identity, and presence/absence of external incentive) affect performance validity test (PVT) performance.

Microscopic Analysis of the Chlamydia abortus Inclusion and Its Interaction with Those Formed by Other Chlamydial Species.

The Chlamydiae are obligate intracellular pathogens that develop and multiply within a poorly characterized parasitophorous vacuole (the inclusion) during growth. Chlamydia abortus is a major pathogen of sheep and other ruminants, and its inclusion development is poorly characterized. We used immunofluorescence microscopy, quantitative culture, and qPCR to examine C.

Dietary long-chain n-3 PUFAs mitigate CD4 T cell/adipocyte inflammatory interactions in co-culture models of obese adipose tissue.

Obese adipose tissue (AT) inflammation is partly driven by accumulation of CD4 T helper (Th)1 cells and reduced Th2 and T regulatory subsets, which promotes macrophage chemotaxis and ensuing AT metabolic dysfunction. This study investigated CD4 T cell/adipocyte cytokine-mediated paracrine interactions (cross talk) as a target for dietary intervention to mitigate obese AT inflammation. Using an in vitro co-culture model designed to recapitulate CD4 T cell accumulation in obese AT (5% of stromal vascular cellular fraction), 3T3-L1 adipocytes were co-cultured with purified splenic CD4 T cells from C57Bl/6 mice consuming one of two isocaloric diets containing either 10% w/w safflower oil (control, CON) or 7% w/w safflower oil+3% w/w fish oil (FO) for 4 weeks (n=8-11/diet).

Pre-screening for bariatric surgery patients: comparative effectiveness of transnasal endoscopy versus esophagogastroduodenoscopy.

Background: Endoscopic evaluation is frequently performed before bariatric surgery to identify foregut pathology that may alter procedure selection. Transnasal endoscopy (TNE) is an alternative to esophagogastroduodenoscopy (EGD). The objective of this study was to compare TNE to EGD.

Clonal precursor of bone, cartilage, and hematopoietic niche stromal cells.

Organs are composites of tissue types with diverse developmental origins, and they rely on distinct stem and progenitor cells to meet physiological demands for cellular production and homeostasis. How diverse stem cell activity is coordinated within organs is not well understood. Here we describe a lineage-restricted, self-renewing common skeletal progenitor (bone, cartilage, stromal progenitor; BCSP) isolated from limb bones and bone marrow tissue of fetal, neonatal, and adult mice.

Early clinical experience with a candidate meningococcal B recombinant vaccine (rMenB) in healthy adults.

Background: The development of a broadly protective vaccine against meningococcal serogroup B is a well-recognized public health need. Whole-genome sequencing was used to identify meningococcal surface proteins that are conserved across strains. These proteins were incorporated into two investigational vaccines.

Endochondral ossification is required for haematopoietic stem-cell niche formation.

Little is known about the formation of niches, local micro-environments required for stem-cell maintenance. Here we develop an in vivo assay for adult haematopoietic stem-cell (HSC) niche formation. With this assay, we identified a population of progenitor cells with surface markers CD45(-)Tie2(-)alpha(V)(+)CD105(+)Thy1.

Staying on course with strategic metrics.

Providers need to understand the various types of metrics, the importance of each type, and how to use them effectively. Providers should use strategic metrics to monitor implementation of their organization's strategic plan. To overcome obstacles to successful use of strategic metrics, providers should communicate the organization's strategic intent, establish accountability for achieving the targets, and ensure buy-in through review of metrics and involvement of appropriate people.

A high-throughput screen for porphyrin metal chelatases: application to the directed evolution of ferrochelatases for metalloporphyrin biosynthesis.

Porphyrins are of particular interest in a variety of applications ranging from biocatalysis and chemical synthesis to biosensor and electronic technologies as well as cancer treatment. Recently, we have developed a versatile system for the high-level production of porphyrins in engineered E. coli cells with the aim of diversifying substitution patterns and accessing porphyrin systems not readily available through chemical synthesis.

Failure of the canine principal ascending epicardial lymphatic to regenerate after transection.

We transected the principal ascending anterior epicardial cardiac lymphatic in 10 dogs, and after varying time intervals reoperated to look for lymphatic regeneration using dye injection. Photographs and sketches were made to record the findings, and in six dogs serial histologic sections were also examined. In none of the 10 dogs was regeneration of the transected principal cardiac lymphatic detected although small lymphatic collaterals from the distal side of the lymphatic developed in 2 dogs.

Chitosans as absorption enhancers for poorly absorbable drugs 2: mechanism of absorption enhancement.

Purpose: It has recently been shown that the absorption enhancing and toxic effects of chitosans are dependent on their chemical composition. In this study, the mechanisms underlying these effects were investigated at the cellular level.

Methods: The effects on epithelial cells of chitosans with different chemical composition, absorption enhancing properties and toxicities were studied in Caco-2 monolayers.

Delirium and cognitive disorders after cardiac operations: relationship to pre- and intraoperative quantitative electroencephalogram.

We examined the incidence of delirium and cognitive disorders after cardiac operations and the related risk factors. The value of pre- and intraoperative QEEG was determined. Using the Mini-Mental State Examination and the Saskatoon Delirium Checklist, 321 patients were tested during the immediate postoperative period.

Visualization of the lymphatics of the heart and the mediastinal drainage pathways in the living cynomolgous (Macaca mulatta) monkey.

Our interest in the effects of impaired cardiac lymph drainage on coronary atherosclerosis led us to study the cardiac lymphatic anatomy in the monkey, generally considered the ideal experimental animal for examining coronary artery disorders. Short-term and long-term studies to visualize the cardiac lymphatic system and its mediastinal drainage pathways in 14 living monkeys confirmed that the epicardial collecting lymphatic anatomy is comparable to that of man, dog, and pig. These lymphatics, and particular lymphatic drainage to the cardiac lymph node in the right mediastinum, are difficult to visualize, in good part, because lymph uptake of such tracers as India Ink and T1824 blue dye is extremely slow.

The efferent cardiac lymphatic pathways in the macaque monkey.

In ten postmortem hearts of the Macaque monkey (M. mulatta), the coronary lymphatics were visualized using an India ink suspension in 2% gelatin. The left coronary lymphatic initially passed to the dorsal surface of the aortic arch.

The role of the lymphatic system in coronary atherosclerosis.

Arguments are presented to support the hypothesis that the integrity of the coronary lymphatic system is an important factor in the development of coronary atherosclerosis. It is proposed that the lymphatic drainage of the epicardial coronary arteries is genetically inadequate, and that the flow of lymph from the heart is further impaired by gravitational factors due to man's upright position. Arguments are presented to support the concept that the intramural coronary arteries are protected from atherosclerosis because of a highly effective pericoronary lymphatic and venous capillary system and that the internal thoracic (internal mammary) artery is similarly protected from atherosclerosis because of its close relationship to an extensive lymphatic chain.

The lymphatic drainage of the pericardial space in the dog.

The purpose of this study was to characterize definitively the lymphatic drainage system of the pericardial space in the dog. The reports on this subject, based on dissection experiments and acute dye injections, remain controversial, and our own previous studies have been incomplete. Seventeen dogs were studied using a radiographic technique.

Latency of Plasma Membrane H-ATPase in Vesicles Isolated by Aqueous Phase Partitioning : Increased substrate Accessibility or Enzyme Activation.

The properties of the plasma membrane H(+)-ATPase and the cause of its latency have been studied using a highly purified plasma membrane fraction from oat (Avena sativa L., cv Victory) roots, prepared by aqueous two-phase partitioning. The ATPase has a maximum specific activity (at 37 degrees C) in excess of 4 micromoles inorganic phosphate per milligram protein per minute in the presence of nondenaturing surfactants.

Comparative study of warfarin versus antiplatelet therapy in patients with a St. Jude Medical valve in the aortic position.

To determine the necessity of long-term warfarin anticoagulation after St. Jude Medical aortic valve replacement in adults, we evaluated the risks of thromboembolism, valve thrombosis, anticoagulant hemorrhage, and sudden cardiac death in two groups of patients. Group I consisted of 41 patients treated with conventional long-term warfarin therapy.

An eight-year experience with porcine bioprosthetic cardiac valves.

A total of 589 porcine bioprostheses were implanted in 509 patients from January, 1976, through December, 1983. Of the valves implanted, 390 were Hancock and 199 were Carpentier-Edwards. A total of 1,633 patient-years was accrued, with a mean follow-up of 38 months per patient.