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Context: In today's sport settings, the athletic trainer is often the first member or the health care team with whom the athlete interacts. Delivery of patient care can be improved by increasing patient/athlete satisfaction.Objective: To evaluate the satisfaction collegiate student-athletes had with their athletic trainer(s) and the athletic training services provided at their institutions.Design: A survey format was solicited to 40 randomly selected National Collegiate Athletic Association Division I and II athletic training programs in 4 regions across the United States.Setting: Collegiate athletic training environment.Patients or Other Participants: A total of 325 student-athletes from 20 of the programs solicited agreed to participate.Main Outcome Measure(s): The questionnaire was a variation on a previously used instrument developed for assessing athletes' perceptions of care. Validity and reliability analyses supported use of the instrument. A linear regression model was calculated to determine predictors of satisfaction score.Results: Significant differences in satisfaction scores were observed between athletes in high- and low-profile sports and between male and female athletes. When sex and sport profile were combined, differences in scores were noted between female athletes in high-profile sports and males in low-profile sports. Both sex and sport profile were predictors of satisfaction among the student-athletes who participated in the study.Conclusions: Female athletes and athletes in high-profile sports demonstrated greater satisfaction with their athletic trainer(s). Competitive level did not have a significant influence on satisfaction. [ABSTRACT FROM AUTHOR]

Background: Artwork can be used to practice the development of holistic care for nursing students. This activity was designed for senior nursing students to develop their holistic nursing skills through a series of in-class activities while viewing Frida Kahlo's The Broken Column . Aim: This study's aim was to design an educational experience to develop a more holistic approach to caring for patients for nursing students. Method: Students submitted their initial impressions of the painting via an anonymous quiz. After a guided Visual Thinking Strategies (VTS) session, students submitted impressions of the artwork. A VTS facilitator read a history of an accident which revealed the cause of Kahlo's medical and emotional pain. Students then wrote about their perceptions of the painting's meaning and how they might use VTS in caring for their patients. Answers were analyzed using Braun and Clark's thematic analysis. Results: The themes identified were emotions and feelings, metaphor, life/story, and listening to inform perspective. Most found that VTS changed their impressions and enhanced their ability to question patients and inform their care. Conclusion: Students found that VTS expanded their view of patient care and helped them see the patient more holistically, aligning with the development of clinical judgment.

Background: Many nursing faculty lack formal training in item writing and test construction., Purpose: This integrative review synthesizes the evidence to gain a comprehensive understanding of the developmental needs and interventions employed to help nursing faculty gain skills to develop course examinations., Methods: Original research and non-research reports published since 2012 were included. Independent quality appraisals were completed based on the Johns Hopkins Nursing Evidence-based Practice Model. Data were analyzed using the constant comparison method., Results: Nineteen reports met inclusion criteria. Themes related to test development skills were standards support practice, educational preparation, evolving technologies, and writing for clarity. Themes related to faculty development were continuous improvement, professional development plans, peer and expert collaboration, and up-to-date resources., Conclusions: Nursing programs need to establish methods to ensure faculty use best practices and are competent in test development. Nursing needs future research to understand optimal faculty development approaches., Competing Interests: Disclosures : The authors declare no conflicts of interest., (Copyright © 2024 The Authors. Published by Wolters Kluwer Health, Inc.)

Objective: To examine the efficacy, safety, and long-term durability of the autologous pubovaginal sling for stress incontinence over a 29-year period., Methods: A total of 192 consecutive female patients with stress urinary incontinence who underwent autologous pubovaginal sling from 1993 through 1999 were analyzed over a 29-year period. Intermediate and ultra long-term follow-up were obtained at a mean of 4 and 23 years, respectively. A total of 51 patients had sufficient data at both time intervals and were evaluated using a standardized questionnaire for resolution of stress incontinence, the primary endpoint, as well as resolution of urge incontinence, overall dryness, and voiding dysfunction., Results: At intermediate-term follow-up (mean 45.3 months), 96% of 51 patients reported no stress incontinence. In addition, 76% of patients experienced resolution of their preoperative urge incontinence. Overall dryness occurred in 84%. At ultra long-term follow-up (mean 22.9 years), 84% reported no stress incontinence and an overall dryness rate of 53%. Postoperative voiding dysfunction included de novo urge incontinence (3 patients) and persistent urinary obstruction requiring urethrolysis (1 patient)., Conclusion: The autologous pubovaginal sling is effective, safe, and durable at a mean of 23 years, the longest known follow-up in the literature. Given the U.S. Food and Drug Administration (FDA) warnings regarding transvaginal mesh and growing concerns with the synthetic midurethral sling, the autologous pubovaginal sling should be offered as an option to those women seeking treatment for stress urinary incontinence., Competing Interests: Declaration of Competing Interest All authors declare no conflicts of interest., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Visual Thinking Strategies is a teaching technique initially studied in primary education but recently has been used to teach nursing students and other healthcare professionals. VTS has been found to help participants think and see differently, explore learning in safe environments, and develop ethical competencies. Experiences with VTS can create rich discussions and present opportunities for nurses to talk about issues and concerns that may not always present in the classroom. VTS can provide participants with the ability to explore meanings and engage in conversations about diversity and social determinants of health. This article explores how teachers can use VTS to create meaningful dialogue with participants and relate it to their care of patients.

Introduction: In recent years, there has been significant growth of ambulatory oncology pharmacy, yet there is a paucity of published studies on the clinical activities and impact of ambulatory oncology clinical pharmacists. At Duke Cancer Center, dedicated pharmacist services are embedded in specialized outpatient oncology areas. Pharmacists document their clinical and administrative activities in the electronic health record. The primary objective of this study is to quantify and assess ambulatory oncology pharmacist interventions in clinics in a large academic comprehensive cancer center., Methods: For the purposes of this single-center, retrospective, descriptive study, pharmacist interventions were collected, quantified, and described over a 6-month period from July 1 to December 31, 2015. The study evaluated the perceived contribution and impact of a pharmacist on patient care in ambulatory oncology clinics via a survey that was distributed to providers and nurses., Results: In the 6-month time period, there were 5,091 interventions spanning 3,967 patient encounters between nine ambulatory oncology clinic pharmacists. The average time per encounter in the 6-month time frame was 22.4 minutes. There were 92 respondents to the survey (61.7% response rate). Overall, responses showed that the clinical pharmacists add value to patient care and are integral members of the team., Conclusions: Although previous studies have described pharmacist activities in outpatient oncology clinics, this study showed a larger number and variety of clinical pharmacist activities in outpatient cancer clinics to improve patient care. Future directions include conducting prospective, controlled studies to link pharmacist activities to tangible outcomes., Competing Interests: The authors have no conflicts of interest to disclose., (© 2020 Harborside™.)

The purpose of this review is to describe how pregnant and postpartum women with substance use disorders (SUDs) experience health care encounters in prenatal care, labor and delivery, postpartum, and nursery/neonatal intensive care unit (NICU) settings. Findings from 23 qualitative studies on the topic were synthesized using a metasummary approach. The majority of the studies revealed that pregnant and postpartum women with SUDs tend to experience their health care encounters as conflictual, although some studies revealed that some women experience their health care encounters as supportive. The results of metasummary included a taxonomy of health care encounters. Five types of adverse encounters were identified: judgmental, disparaging, scrutinizing, disempowering, and deficient-care. Three types of beneficial encounters were identified: recovery-based, accepting, and effective-care. The findings suggest the importance of stigma awareness, therapeutic patient-provider communication, patient activation, and integrated care.

Objective: Wound healing is a complex process involving the dynamic interplay of various types of cells and bioactive factors. Impaired wound healing is characterized by a loss in synchronization of the process, resulting in non-healing chronic wounds. Human amniotic membrane (AM) has been shown to be effective in the management of chronic wounds. Recently, a viable lyopreserved AM (VLAM) has been developed. The VLAM retains the structural, molecular, and functional properties of fresh AM with the advantage of a long shelf life for living tissue at ambient temperatures. The objective of this study was to evaluate the effects of VLAM on the impaired wound microenvironment and wound closure in db/db mice. Approach: VLAM or saline gel (control) was applied weekly to 7-mm excisional wounds in diabetic (db/db) mice. Wound appearance and size were assessed weekly. Inflammation and redox state in wounds were tested by cytokine gene and protein expression, and by catalase and glutathione peroxidase activities, respectively. Wound tissue granulation and neovascularization were assessed histologically. Results: Diabetic wounds treated with VLAM closed faster than control wounds. On an average, VLAM-treated wounds closed 4 days faster than the control wounds, with a significantly faster rate of closure at days 7 and 14 as compared with control wounds. The faster closure correlated with a decrease in the expression of proinflammatory factors and oxidative stress, and an increase in angiogenesis and dermal thickness. Innovation: Effects of VLAM on a chronic wound microenvironment and underlying molecular mechanisms were investigated for the first time. Conclusion: VLAM accelerates wound closure in db/db mice by decreasing inflammation and oxidative stress and supporting wound tissue granulation, neovascularization, and re-epithelialization.

Post-operative adhesions, a common complication of surgery, cause pain, impair organ functionality, and often require additional surgical interventions. Control of inflammation, protection of injured tissue, and rapid tissue repair are critical for adhesion prevention. Adhesion barriers are biomaterials used to prevent adhesions by physical separation of opposing injured tissues. Current adhesion barriers have poor anti-inflammatory and tissue regenerative properties. Umbilical cord tissue (UT), a part of the placenta, is inherently soft, conforming, biocompatible, and biodegradable, with antimicrobial, anti-inflammatory, and antifibrotic properties, making it an attractive alternative to currently available adhesion barriers. While use of fresh tissue is preferable, availability and short storage time limit its clinical use. A viable cryopreserved UT (vCUT) "point of care" allograft has recently become available. vCUT retains the extracellular matrix, growth factors, and native viable cells with the added advantage of a long shelf life at -80 °C. In this study, vCUT's anti-adhesion property was evaluated in a rabbit abdominal adhesion model. The cecum was abraded on two opposing sides, and vCUT was sutured to the abdominal wall on the treatment side; whereas the contralateral side of the abdomen served as an internal untreated control. Gross and histological evaluation was performed at 7, 28, and 67 days post-surgery. No adhesions were detectable on the vCUT treated side at all time points. Histological scores for adhesion, inflammation, and fibrosis were lower on the vCUT treated side as compared to the control side. In conclusion, the data supports the use of vCUT as an adhesion barrier in surgical procedures.

Human amniotic membrane (AM) has a long history of clinical use for wound treatment. AM serves as a wound protective barrier maintaining proper moisture. AM is anti-inflammatory, anti-microbial and antifibrotic, and supports angiogenesis, granulation tissue formation and wound re-epithelialization. These properties of AM are attributed to its native extracellular matrix, growth factors, and endogenous cells including mesenchymal stem cells. Advances in tissue preservation have helped to overcome the short shelf life of fresh AM and led to the development of AM products for clinical use. Viable cryopreserved amnion (VCAM), which retains all native components of fresh AM, has shown positive outcomes in clinical trials for wound management. However, cryopreservation requires ultra-low temperature storage and shipment that limits widespread use of VCAM. We have developed a lyopreservation technique to allow for ambient storage of living tissues. Here, we compared the structural, molecular, and functional properties of a viable lyopreserved human amniotic membrane (VLAM) with properties of VCAM using in vitro and in vivo wound models. We found that the structure, growth factors, and cell viability of VLAM is similar to that of VCAM and fresh AM. Both, VCAM and VLAM inhibited TNF-α secretion and upregulated VEGF expression in vitro under conditions designed to mimic inflammation and hypoxia in a wound microenvironment, and resulted in wound closure in a diabetic mouse chronic wound model. Taken together, these data demonstrate that VLAM structural and functional properties are equivalent to VCAM but without the constraints of ultra-low temperature storage., Competing Interests: I have read the journal's policy and the authors of this manuscript have the following competing interests: All authors are full time paid employees of Osiris Therapeutics Inc.

Chronic wounds remain a large problem in the field of medicine and are often associated with risk of infection and amputation. Recently, a commercially available human cryopreserved viable amniotic membrane (hCVAM) has been shown to effectively promote wound closure and reduce wound-related infections. A sprevious study indicates that hCVAM can inhibit the growth of bacteria associated with chronic wounds. In the present study, we investigated the mechanism of hCVAM antimicrobial activity. Our data demonstrate that antimicrobial activities against common pathogens in chronic wounds such as P.aeruginosa, S.aureus and Methicillin-resistant S.aureus (MRSA) are mediated via the secretion of soluble factors by viable cells in hCVAM and that these factors are proteins in nature. Further, we show that genes for antimicrobial peptides (AMPs) including human beta-defensins (HBDs) are expressed by hCVAM and that expression levels positively correlate with antimicrobial activity of hCVAM. At the protein level, our data indicate that HBD2 and HBD3 are secreted by hCVAM and directly contribute to its activity against P. aeruginosa. These data provide evidence that soluble factors including AMPs are hCVAM antimicrobial agents and are consistent with a role for AMPs in mediating antimicrobial properties of the membrane.

Health care is increasingly complex, as nurses navigate working in teams and conveying critical information to others. Clear communication and accuracy are critical for nurses because they communicate to patients and other members of the health care team. Art, and more specifically, Visual Thinking Strategies (VTS), are ways for nurses to practice communication and clear articulation of ideas. VTS also allows nurses to explore finding their voices and working with others to provide safe and effective communication among the team, including patients and their families.

Visual Thinking Strategies (VTS) is a structured art-viewing technique designed to teach critical thinking and aesthetic appreciation. Literature on how VTS might be used in nursing is just emerging. This qualitative descriptive study examined written responses to how 14 doctorate of nursing practice students thought they might use VTS in their practice after engaging in a classroom session. Three themes emerged for how nurses might use VTS: Facilitating Interpersonal Relationships, Changing Thinking in Practice, and As a Teaching Tool. This study contributes to the growing body of literature that suggests that art and VTS and can be used in nursing with practitioners of all levels to promote conversations that involve listening intently and considering other possibilities. J Contin Educ Nurs. 2017;48(8):365-368., (Copyright 2017, SLACK Incorporated.)

We report on the development of a highly miniaturized vacuum package for use in an atomic clock utilizing trapped ytterbium-171 ions. The vacuum package is approximately 1 cm(3) in size and contains a linear quadrupole RF Paul ion trap, miniature neutral Yb sources, and a non-evaporable getter pump. We describe the fabrication process for making the Yb sources and assembling the vacuum package. To prepare the vacuum package for ion trapping, it was evacuated, baked at a high temperature, and then back filled with a helium buffer gas. Once appropriate vacuum conditions were achieved in the package, it was sealed with a copper pinch-off and was subsequently pumped only by the non-evaporable getter. We demonstrated ion trapping in this vacuum package and the operation of an atomic clock, stabilizing a local oscillator to the 12.6 GHz hyperfine transition of (171)Y b(+). The fractional frequency stability of the clock was measured to be 2 × 10(-11)/τ(1/2).

Introduction: Cetuximab is a chimeric mouse-human (30:70) IgG1 monoclonal antibody that competitively inhibits the binding of epidermal growth factor. Cetuximab is generally well tolerated; however, hypersensitivity infusion reactions have been reported. The incidence at the University of Oklahoma was currently unknown, though anecdotally high. The purpose of this study was to determine the incidence of severe HIRs and secondarily to determine risk factors for cetuximab-induced hypersensitivity infusion reactions., Methods and Results: A retrospective chart review was conducted and included all patients that received cetuximab from 2005 to 2010 at the outpatient clinics of the Oklahoma University Health Sciences Center. A total of 153 patients were included in the analysis. The overall incidence proportion of severe hypersensitivity infusion reactions was 12.4%. Male patients had an increased incidence of severe hypersensitivity infusion reactions compared to female patients (20.6% vs. 5%, p = 0.0036). Current smokers had an increased incidence of severe hypersensitivity infusion reactions of 23.6% when compared to never smokers or former smokers, p = 0.0012. Cervical cancer had a significantly decreased risk of severe hypersensitivity infusion reactions when compared to other tumor types (5.3% vs. 16.7%, p = 0.0387). Multivariate analysis identified risk factors associated with severe HIRs to be: male gender, RR = 3.9, p = 0.01 and current smokers, RR = 3.98, p = 0.0048., Conclusion: Patients at the University of Oklahoma had an increased incidence of severe hypersensitivity infusion reactions when compared to the national average. Male patients and current smokers were found to be at increased risk for severe hypersensitivity infusion reactions in our study. Further investigation is warranted.

A persistent omphalomesenteric duct remnant is a rare finding, which typically presents in the pediatric population. Most commonly, it is encountered in the form of a Meckel's diverticulum. In rare instances, omphalomesenteric cysts have been reported in the pediatric population. We present a case of a symptomatic omphalomesenteric cyst in an adult male and our management of this entity.

Using a flow cytometry-based screen of commercial antibodies, we have identified cell-surface markers for the separation of pancreatic cell types derived from human embryonic stem (hES) cells. We show enrichment of pancreatic endoderm cells using CD142 and of endocrine cells using CD200 and CD318. After transplantation into mice, enriched pancreatic endoderm cells give rise to all the pancreatic lineages, including functional insulin-producing cells, demonstrating that they are pancreatic progenitors. In contrast, implanted, enriched polyhormonal endocrine cells principally give rise to glucagon cells. These antibodies will aid investigations that use pancreatic cells generated from pluripotent stem cells to study diabetes and pancreas biology.

Clinical simulations are gaining more attention in the field of maternal-child health and allow nursing programs and service organizations to assess competency of students and staff in key patient safety situations. Nursing and midwifery programs, orientations, and yearly reaccreditation modules commonly include simulation on postpartum hemorrhage, placenta abruption, shoulder distocia, and other high-risk, low-incidence emergency events. This article describes the use of simulations by educators and managers as teaching or professional development strategies.

This study explores the combined effect of message framing, intention to quit smoking, and nicotine dependence on the persuasiveness of smoking cessation messages. Pre- and post-message measures of quit intention, attitude toward smoking cessation, and perceived behavioral control were taken in two separate waves from current cigarette smokers with varying levels of nicotine dependence (N=151). In the second wave, participants were randomly assigned to one of two groups. In the first group, participants read a smoking cessation message which emphasized the benefits of quitting (positive frame). In the second group participants read a message which emphasized the costs of not quitting (negative frame). Results show that smokers' intentions to quit smoking and their level of nicotine dependence jointly influence the persuasiveness of positive and negative message frames. When nicotine dependence and quitting intention are both high, a negative frame works best. Conversely, a positive frame is preferable when nicotine dependence or quitting intention is low. Smokers' level of processing is proposed as the underlying mechanism explaining the different effects of message frames.

Food allergies affect an estimated 10 to 12 million people in the United States. Some of these individuals can develop life-threatening allergic reactions when exposed to allergenic proteins. At present, the only successful method to manage food allergies is to avoid foods containing allergens. Consumers with food allergies rely on food labels to disclose the presence of allergenic ingredients. However, undeclared allergens can be inadvertently introduced into a food via cross-contact during manufacturing. Although allergen removal through cleaning of shared equipment or processing lines has been identified as one of the critical points for effective allergen control, there is little published information on the effectiveness of cleaning procedures for removing allergenic materials from processing equipment. There also is no consensus on how to validate or verify the efficacy of cleaning procedures. The objectives of this review were (i) to study the incidence and cause of allergen cross-contact, (ii) to assess the science upon which the cleaning of food contact surfaces is based, (iii) to identify best practices for cleaning allergenic foods from food contact surfaces in wet and dry manufacturing environments, and (iv) to present best practices for validating and verifying the efficacy of allergen cleaning protocols.

2-Cyclohexene-1-one (CHX) is a cyclic alpha,beta-unsaturated ketone with broad human exposure. CHX is an environmental pollutant and is present in tobacco smoke and in soft drinks sweetened with cyclamate. Interest in the toxicity of this class of compounds is due to their structural similarity to the cytotoxin acrolein. In a pilot study, rats and mice were exposed to 0, 20, 40, or 80 ppm CHX for 6 h/day. The study was terminated after 4 days due to acute toxicity in the high-dose groups. In a subsequent 14-day study, mice and rats were exposed to 0, 2.5, 5, or 10 ppm CHX for 6 h/day. All animals survived exposure until terminal sacrifice. Body weights were not significantly different from controls after 14 days of exposure. Liver/body weights were increased in male and female mice exposed to 5 and 10 ppm, and in male and female rats exposed to 10 ppm CHX. Ninety-day toxicity studies were conducted to provide data required to design chronic toxicity and carcinogenicity studies of CHX if it is determined such studies are necessary. Groups of 10 male and female F-344 rats and B6C3F1 mice were exposed to 0, 2.5, 5, or 10 ppm CHX for 6 h/day for 13 wk. All animals survived until sacrifice. Body weights were not significantly different from controls after 13 wk of exposure. Liver weights were increased in male and female mice exposed to 5 and 10 ppm and in male and female rats exposed to 10 ppm CHX. No adverse effects on bone-marrow micronuclei, sperm motility, or vaginal cytology were observed. Microscopic lesions included hyperplasia, and squamous metaplasia in the nasal cavity in rats and mice of both sexes at all doses. Nasal-cavity erosion and suppurative inflammation also occurred in high-dose mice. Larynx and lung were not affected in either sex or species. Dose-related hepatic centrilobular cytoplasmic vacuolation was seen in male rats only. These data suggest that CHX acts as an alkylating agent primarily producing toxicity at the exposure site.

Human mesenchymal stem cells are thought to be multipotent cells, which are present in adult marrow, that can replicate as undifferentiated cells and that have the potential to differentiate to lineages of mesenchymal tissues, including bone, cartilage, fat, tendon, muscle, and marrow stroma. Cells that have the characteristics of human mesenchymal stem cells were isolated from marrow aspirates of volunteer donors. These cells displayed a stable phenotype and remained as a monolayer in vitro. These adult stem cells could be induced to differentiate exclusively into the adipocytic, chondrocytic, or osteocytic lineages. Individual stem cells were identified that, when expanded to colonies, retained their multilineage potential.

alpha-Methylstyrene (AMS) is a chemical intermediate used in the synthesis of specialty polymers and copolymers. Inhalation studies of AMS were conducted because of the lack of toxicity data and the structural similarity of AMS to styrene, a toxic and potentially carcinogenic chemical. Male and female B6C3F1 mice were exposed to 0, 600, 800, or 1000 ppm AMS 6 h/day, 5 days/week, for 12 days. After 1 exposure, 21% (5/24) of female mice were found dead in the 1000-ppm group, 56% (10/18) in the 800-ppm group, and 6% (1/18) in the 600-ppm concentration group. After 12 exposures, relative liver weights were significantly increased and relative spleen weights were significantly decreased in both male and female mice at all concentrations. No microscopic treatment-related lesions were observed. A decrease in hepatic glutathione (GSH) was associated with AMS exposure for 1 and 5 days. Male and female F344 rats were exposed to 0, 600 or 1000 ppm AMS for 12 days. No mortality or sedation occurred in AMS-exposed rats. Relative liver weights were significantly increased in both males and females after 12 exposures to 600 or 1000 ppm. An increased hyaline droplet accumulation was detected in male rats in both concentration groups; no significant microscopic lesions were observed in other tissues examined. Exposure of male and female F344 rats and male NBR rats to 0, 125, 250 or 500 ppm AMS, 6 h/day for 9 days resulted in increased accumulation of hyaline droplets in the renal tubules of male F344 rats in the 250 and 500 ppm concentration groups. Although AMS and styrene are structurally very similar, AMS was considerably less toxic for mice and more toxic for male rats than styrene.

Mesenchymal stem cells (MSCs) are a population of pluripotent cells within the bone marrow microenvironment defined by their ability to differentiate into cells of the osteogenic, chondrogenic, tendonogenic, adipogenic, and myogenic lineages. We have developed methodologies to isolate and culture-expand MSCs from human bone marrow, and in this study, we examined the MSC's role as a stromal cell precursor capable of supporting hematopoietic differentiation in vitro. We examined the morphology, phenotype, and in vitro function of cultures of MSCs and traditional marrow-derived stromal cells (MDSCs) from the same marrow sample. MSCs are morphologically distinct from MDSC cultures, and flow cytometric analyses show that MSCs are a homogeneous cell population devoid of hematopoietic cells. RT-PCR analysis of cytokine and growth factor mRNA in MSCs and MDSCs revealed a very similar pattern of mRNAs including IL-6, -7, -8, -11, -12, -14, and -15, M-CSF, Flt-3 ligand, and SCF. Steady-state levels of IL-11 and IL-12 mRNA were found to be greater in MSCs. Addition of IL-1alpha induced steady-state levels of G-CSF and GM-CSF mRNA in both cell preparations. In contrast, IL-1alpha induced IL-1alpha and LIF mRNA levels only in MSCs, further emphasizing phenotypic differences between MSCs and MDSCs. In long-term bone marrow culture (LTBMC), MSCs maintained the hematopoietic differentiation of CD34+ hematopoietic progenitor cells. Together, these data suggest that MSCs represent an important cellular component of the bone marrow microenvironment.

Carbon disulfide (CS2) is an important industrial chemical widely used in the production of rayon, cellophane, fungicides and biocides. The uptake and elimination kinetics of CS2 was characterized for a single i.v. dose and for a single inhalation exposure. The uptake of CS2 into the blood was rapid with half times of 6 to 9 minutes. Elimination was relatively quick with terminal elimination half times of 41 to 77 minutes. The plateau CS2 blood concentration was lower in females than in males and lower in the male 50 ppm treatment group than would be predicted by linear dose proportionality compared to the 500 ppm and 800 ppm treatments. The CS2 blood concentration for the female 50 ppm group was below the limit of detection. The total and central compartment apparent volumes of distribution, 4.2 l/kg and .9 l/kg, were estimated from a single 50 mg/kg i.v. dose. The concentration of CS2 in blood resulting from repeated exposure, was investigated in a 13 week inhalation study. Blood samples were taken in rats previously exposed to 0, 50, 500, and 800 ppm CS2 for 2, 4, 8, or 13 weeks. The concentration of CS2 in the blood of male rats remained relatively constant throughout study. However the female 500 and 800 ppm groups showed a marked decrease over the course of the 13 week study. The concentration of CS2 in the blood from the 500 and 800 ppm groups of both sexes at all time points was higher compared to the 50 ppm group, than would be predicted by linear dose proportionality. The concentration of 2-thiothiazolidine-4-carboxylic acid in urine collected from the same animals lacked dose proportionality between the treatment groups at all time points. CS2 exposure caused dose-related decreases in body weight gain in both male and female rats.