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Mao L, Zhu L, Zhou Q, Wang X, Hu H. RFLP analysis of the progeny from Oryza alta Swallen x Oryza sativa L. Genome 2012; 38:913-8. [PMID: 18470217 DOI: 10.1139/g95-120] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
RFLP analyses were carried out in the progeny from a cross of two phylogenetically distant rice species, wild rice Oryza alta Swallen (CCDD, 2n = 48) and cultivated rice O. sativa L. (AA, 2n = 24). The sterile plants gave heterozygous RFLP patterns at most of the loci detected. They looked more like their wild rice parent, with 36 chromosomes in their root-tip cells and pollen mother cells. In two partially fertile plants, however, most of the markers that were used showed RFLP patterns similar to the cultivated parent, O. sativa. By cytological study, it was found that nearly one-third of the chromosomes had been eliminated in the partially fertile plants. Their seeds have short awns, which is a characteristic of their wild parent, O. alta. An introgression occurred in one of the partially fertile plants, which led to the discussion about a nonconventional mechanism in wide hybridization for transference of wild rice chromosome segments to cultivated rice chromosomes.
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652
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Khan RB, Hudson MM, Brannon Morris E, Ledet D, Pui CH, Scott H, Browne E, Crom D, Hinds P, Zhu L, Kumar S, Ness KK, Rogers LR, Ostrom Q, Vengoechea J, Chen Y, Davitkov P, Strodtbeck K, Selman WR, Gerson S, Nock C, Machtay M, Lo S, Sloan AE, Barnholtz-Sloan J, Johnson DR, Decker PA, Hanson AC, Hammack JE, Amirian ES, Goodman JC, New P, Scheurer ME, Kruchko C, Dolecek TA, McCarthy BJ, Mulpur BH, Nabors LB, Egan KM, Browning JE, Olson JJ, Thompson RC, Madden MH, Lupo PJ, Cai Y, Nousome D, Scheurer ME, O'Neill BP, Decker PA, Cerhan JR, Villano JL, Moirangthem V, Pittman T, Durbin EB, Campen CJ, Von Behren J, Reynolds P, Fisher PG, Merker VL, Slattery WH, Muzikansky A, Barker FG, Plotkin SR, Rotman LE, Ostrom Q, Vengoechea J, Kuhns B, Rogers L, Sloan A, Barnholtz-Sloan J, Mrugala MM, Wen PY, Rogers LR, Sonabend AM, Zacharia BE, Goldstein H, Bruce S, Bruce JN, Kim T, Chiang VL, Yu JB. CLIN-EPIDEMIOLOGY. Neuro Oncol 2012. [DOI: 10.1093/neuonc/nos221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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653
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Manuchehrabadi N, Attaluri A, Cai H, Edziah R, Lalanne E, Bieberich C, Ma R, Johnson AM, Zhu L. MicroCT Imaging and In Vivo Temperature Elevations in Implanted Prostatic Tumors in Laser Photothermal Therapy Using Gold Nanorods. J Nanotechnol Eng Med 2012. [DOI: 10.1115/1.4007161] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this study, in vivo animal experiments are performed on implanted xenograph prostatic tumors in nude mice to investigate enhanced laser energy absorption in the tumors by an intratumoral injection of gold nanorod solutions. In vivo temperature mapping of the tumors during laser photothermal therapy has shown the feasibility of elevating tumor temperatures higher than 50 °C using only 0.1 ml nanorod solution and a low laser irradiance of 1.6 W/cm2 incident on the tumor surface. The temperature profile suggests that normal tumor tissue still absorbs some amount of the laser energy without nanorod presence; however, the injected nanorods ensure that almost all the laser energy is absorbed and confined to the targeted tumors. The inverse relationship between the temperature elevations and the tumor size implies a relatively uniform spreading of the nanorods to the entire tumor, which is also shown by microcomputed tomography (microCT) imaging analyses. The feasibility of detecting 250 OD gold nanorod solution injected to the tumors is demonstrated via a high resolution microCT imaging system. Compared to other nanostructures, the gold nanorods used in this study do not accumulate surrounding the injection site. The relatively uniform deposition of the nanorods in the tumors observed by the microCT scans can be helpful in future study in simplifying theoretical simulation of temperature elevations in tumors during laser photothermal therapy.
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654
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Zhu L, Qiu C, Ma C, Zhang X, Xu J. The prognostic and diagnostic use of microRNA expression in chronic HIV infection. Retrovirology 2012. [PMCID: PMC3441888 DOI: 10.1186/1742-4690-9-s2-p166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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655
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McAvey B, Zhu L, Kuokkanen S, Pollard J. Endometrial actions of selective progesterone receptor modulator CDB-4124 (CDB). Fertil Steril 2012. [DOI: 10.1016/j.fertnstert.2012.07.816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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656
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Zhu L, Gao D, Yang J, Li M. Characterization of the phenotype of high collagen-producing fibroblast clones in systemic sclerosis, using a new modified limiting-dilution method. Clin Exp Dermatol 2012; 37:395-403. [PMID: 22582912 DOI: 10.1111/j.1365-2230.2011.04254.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Overproduction of type I collagen in fibroblasts of systemic sclerosis (SSc) is the hallmark of fibrosis. Establishment and characterization of the phenotype of SSc fibroblasts has been hindered by the heterogeneity between fibroblasts and the lack of adequate cloning methods. AIM To establish and investigate the characteristics of the SSc high collagen-producing fibroblast phenotype. METHODS Primary cultured fibroblasts from skin biopsies of patients with SSc and normal controls were cloned by a new modified limiting-dilution method. All clones were divided into different subpopulations based on their α1(I) procollagen (COL1A1) mRNA level detected by real-time reverse transcriptase PCR assay. In the different subpopulations, cell growth and cycle distribution were analysed by MTT and flow cytometry, COL1A1 promoter activity was examined by transient transfection, and the binding activity of Sp1 to the COL1A1 proximal promoter was investigated by quantitative chromatin immunoprecipitation. RESULTS The clonogenicities of SSc and normal control fibroblasts were similar, but the mean COL1A1 mRNA level of clones and the percentage of the subpopulation with a high COL1A1 mRNA level were significantly higher in SSc fibroblasts than in controls. There was no significant difference on cell growth and cycle between different subpopulations of SSc and control fibroblasts. The COL1A1 proximal promoter activity and its binding activity to Sp1 in the clones were strongly correlated with their COL1A1 mRNA level. CONCLUSION Overproduction of collagen in an SSc fibroblast subpopulation seems to result mainly from the abnormally activated transcription of COL1A1 rather than from overproliferation of fibroblasts. The new modified limiting-dilution method provides a useful means for characterizing cells with heterogeneous phenotypes.
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657
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Nettles RE, Schurmann D, Zhu L, Stonier M, Huang SP, Chang I, Chien C, Krystal M, Wind-Rotolo M, Ray N, Hanna GJ, Bertz R, Grasela D. Pharmacodynamics, Safety, and Pharmacokinetics of BMS-663068, an Oral HIV-1 Attachment Inhibitor in HIV-1-Infected Subjects. J Infect Dis 2012; 206:1002-11. [DOI: 10.1093/infdis/jis432] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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658
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Wang X, Li X, Fan F, Jiao S, Wang L, Zhu L, Pan Y, Wu G, Ling ZQ, Fang J, Chen Y. PAQR3 Plays a Suppressive Role in the Tumorigenesis of Colorectal Cancers. Carcinogenesis 2012; 33:2228-35. [DOI: 10.1093/carcin/bgs245] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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659
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Niu T, Zhu L. TU-A-213CD-10: Accelerated Barrier Optimization Compressed Sensing (ABOCS) Reconstruction for Cone-Beam CT. Med Phys 2012. [DOI: 10.1118/1.4735889] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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660
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Fan Q, Nanduri A, Zhu L, Mazin S. TU-G-BRA-04: Emission Guided Radiation Therapy: A Simulation Study of Lung Cancer Treatment with Automatic Tumor Tracking Using a 4D Digital Patient Model. Med Phys 2012. [DOI: 10.1118/1.4736008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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661
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Niu T, Al-Basheer A, Zhu L. TH-C-BRA-07: Quantitative Cone-Beam CT Imaging in Radiation Therapy Using Planning CT as a Prior: First Patient Studies. Med Phys 2012. [DOI: 10.1118/1.4736323] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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662
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Sun J, Yuan L, Zhu L, He L, Luo X, Wang R, Liu Y. Pharmacokinetics and bioavailability of valnemulin in Muscovy ducks (Cairina moschata). Br Poult Sci 2012; 53:374-8. [DOI: 10.1080/00071668.2012.703776] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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663
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Keil A, Zhu L, Star-Lack J, Fahrig R. SU-E-I-22: Metal Artifact Correction Using KV and Selective MV Imaging. Med Phys 2012; 39:3629. [DOI: 10.1118/1.4734737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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664
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Fan Q, Niu T, Zhu L. WE-G-217BCD-10: Shading Correction in Image Domain for Cone-Beam CT Without Prior Information. Med Phys 2012; 39:3974. [DOI: 10.1118/1.4736218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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665
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Zhao Z, Hashiguchi A, Hu J, Sakiyama Y, Okamoto Y, Tokunaga S, Zhu L, Shen H, Takashima H. Alanyl-tRNA synthetase mutation in a family with dominant distal hereditary motor neuropathy. Neurology 2012; 78:1644-9. [PMID: 22573628 DOI: 10.1212/wnl.0b013e3182574f8f] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE To identify a new genetic cause of distal hereditary motor neuropathy (dHMN), which is also known as a variant of Charcot-Marie-Tooth disease (CMT), in a Chinese family. METHODS We investigated a Chinese family with dHMN clinically, electrophysiologically, and genetically. We screened for the mutations of 28 CMT or related pathogenic genes using an originally designed microarray resequencing DNA chip. RESULTS Investigation of the family history revealed an autosomal dominant transmission pattern. The clinical features of the family included mild weakness and wasting of the distal muscles of the lower limb and foot deformity, without clinical sensory involvement. Electrophysiologic studies revealed motor neuropathy. MRI of the lower limbs showed accentuated fatty infiltration of the gastrocnemius and vastus lateralis muscles. All 4 affected family members had a heterozygous missense mutation c.2677G>A (p.D893N) of alanyl-tRNA synthetase (AARS), which was not found in the 4 unaffected members and control subjects. CONCLUSION An AARS mutation caused dHMN in a Chinese family. AARS mutations result in not only a CMT phenotype but also a dHMN phenotype.
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666
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Lin L, Zhu L, Liu SF, Tang QS, Su YQ, Zhuang ZM. Polymorphic microsatellite loci for Japanese Spanish mackerel (Scomberomorus niphonius). GENETICS AND MOLECULAR RESEARCH 2012; 11:1205-8. [PMID: 22614347 DOI: 10.4238/2012.may.8.2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We isolated and characterized 21 polymorphic microsatellite loci in Japanese Spanish mackerel (Scomberomorus niphonius) using a (GT)(13)-enriched genomic library. Forty individuals were collected from Qingdao, China. We found 3 to 24 alleles per locus, with a mean of 8.8. The observed and expected heterozygosities ranged from 0.263 to 0.975 and from 0.385 to 0.946, with means of 0.655 and 0.685, respectively. Deviation from Hardy-Weinberg proportions was detected at three loci. Two loci showed evidence for null alleles. These microsatellite markers will be useful for population genetic analysis of Japanese Spanish mackerel.
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667
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Cao ZQ, Zhu L, Zhang T, Wu L, Wang Y. Blood pressure and obesity among adolescents: a school-based population study in China. Am J Hypertens 2012; 25:576-82. [PMID: 22337208 DOI: 10.1038/ajh.2012.5] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND There is little information regarding the obesity epidemical situation and risk factors of childhood hypertension (HTN) in China. The present study aimed to determine the prevalence of HTN/prehypertension (PHTN), as well as the associated risk factors, among adolescents in Changsha city, China. METHODS A total of 88,974 adolescents from 49 middle schools in Changsha city between 12 and 17 years of age were examined during 2009. Body weight, height, and blood pressure (BP) were measured in all adolescents. HTN and PHTN were defined according to sex- and age-specific Chinese reference data. Overweight and obesity were also defined according to sex- and age-specific Chinese reference data. RESULTS It was determined that the prevalence of PHTN and HTN were 7.2 and 3.1%, respectively. Furthermore, 14.6% of male adolescents were overweight and 7.0% were obese, whereas 8.6% of female adolescents were overweight and 2.9% were obese. The risk ratio (RR) of HTN were significantly higher in overweight (RR: 2.8, 95% confidence interval (CI): 2.6-3.2) and obese (RR: 8.7, 95% CI: 8.1-9.5) adolescents adjusted for age, sex, and height. CONCLUSIONS Chinese reference data were used to evaluate BP and body mass index (BMI) of children and adolescents. Higher prevalence of HTN was associated with higher BMI percentiles. Being overweight or obese markedly increased the risk of both HTN and PHTN among adolescents between 12 and 17 years of age in Changsha city, China.
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668
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Wang J, Zhu L, Jiang Y, Meng N, Ran W, Yuan H, Liu C, Qu A, Yang R. PO-371 IMAGE-GUIDED IODINE-125 PERMANENT IMPLANTATION AS SALVAGE THERAPY FOR RECURRENT HEAD AND NECK CARCINOMA. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72337-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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669
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Maharaj A, Zhu L, Huang F, Qiu H, Li H, Zhang CY, Jin T, Wang Q. Ectopic expression of glucagon receptor in skeletal muscles improves glucose homeostasis in a mouse model of diabetes. Diabetologia 2012; 55:1458-68. [PMID: 22318544 DOI: 10.1007/s00125-012-2464-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Accepted: 10/28/2011] [Indexed: 01/20/2023]
Abstract
AIMS/HYPOTHESIS Excessive secretion of glucagon partially contributes to the development of diabetic hyperglycaemia. However, complete blocking of glucagon action will lead to adverse effects, since glucagon exerts certain beneficial effects via its receptor in many organs. We aimed to study the effects of a 'decoy receptor' for circulating glucagon on modulating beta cell function and glucose homeostasis in mice by over-producing the glucagon receptor (GCGR) in skeletal muscles. METHODS We generated transgenic mice in which the expression of Gcgr is driven by the muscle specific creatine kinase (Mck) promoter, and assessed the effects of glucagon on the modulation of glucose homeostasis under conditions of extremes of glucose influx or efflux. RESULTS Mck/Gcgr mice showed increased circulating levels of glucagon and insulin, resulting in an unchanged ratio of glucagon-to-insulin. The levels of hepatic glucose-6-phosphatase (G6PC) and fructose-1,6-bisphosphatase (F1,6P2ase) were significantly decreased, whereas the phosphorylation level of pancreatic cAMP-response-element-binding-protein (CREB) was significantly increased in these transgenic mice. Under basal conditions, the mice displayed normal blood glucose levels and unchanged glucose tolerance and insulin sensitivity when compared with their age-matched wild-type (WT) littermates. However, following multiple low-dose streptozotocin injections, Mck/Gcgr mice exhibited a delay in the onset of hyperglycaemia compared with the WT controls. This was associated with preserved beta cell mass and beta cell secretory capacity in response to glucose challenge. CONCLUSIONS/INTERPRETATION We suggest that mild and chronic hyperglucagonaemia, through a strategy involving neutralising peripheral glucagon action, provides beneficial effects on beta cell function and glucose homeostasis. Mck/Gcgr mice thus represent a novel mouse model for studying the physiological effects of glucagon.
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670
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Zhu L, Craciunescu O, Cai J, Steffey B, Adamson J, Chino J. PO-274 DOSIMETRIC IMPACT OF CTS WITH EACH FRACTION ON ORGANS AT RISK FOR HDR VAGINAL CYLINDER BRACHYTHERAPY. Radiother Oncol 2012. [DOI: 10.1016/s0167-8140(12)72240-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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671
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Xing JZ, Zhu L, Huang B, Chen J, Gabos S. Microelectronic-sensing assay to detect presence of Verotoxins in human faecal samples. J Appl Microbiol 2012; 113:429-37. [PMID: 22531010 DOI: 10.1111/j.1365-2672.2012.05321.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
AIMS To develop a novel Vero cell assay that implements a real-time cell electronic sensing (RT-CES) system for the determination of the presence of verotoxin-producing Escherichia coli (VTEC). The assay overcomes the major drawbacks in conventional Vero cell assay, for example, labour-intensive and time-consuming. METHODS AND RESULTS Cells were grown onto the surfaces of microelectronic sensors that are integrated into the bottom surfaces of the microtiter plate. Cellular viability was monitored in real-time and quantified based on changes in the sensor's electrical impedance. For cell viability measurement, the data generated on the RT-CES system correlated well with those obtained by the Vero cell assay for Verotoxins. To assess cytotoxicity, test cells growing on microelectronic sensors were treated with either supernatant from pure cultures, or stool samples. The specific neutralizing antibodies of VT1 and VT2 were used to identify specific toxins in the samples. CONCLUSIONS The RT-CES assay provides a sensitive measurement comparable to conventional crystal violet assay. The assay has been successfully and specifically used to identify VTEC in human faecal samples. SIGNIFICANCE AND IMPACT OF THE STUDY The RT-CES assay significantly shortens the testing time from 48 to 72 h required by the crystal violet assay to only 15 h with automated operation.
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672
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Deng L, Jia HL, Liu CW, Hu KH, Yin GQ, Ye JW, He CH, Chen JH, Xie YP, Dang R, Zhang L, Liu NY, Zhu L, Zhang L. Analysis of differentially expressed proteins involved in hand, foot and mouth disease and normal sera. Clin Microbiol Infect 2012; 18:E188-96. [PMID: 22497606 DOI: 10.1111/j.1469-0691.2012.03836.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We implemented 2-D DIGE technology on proteins prepared from serum obtained from children with hand, foot and mouth disease (HFMD) and controls, to study the differentially expressed proteins in control and HFMD serum samples. Proteins found to be differentially expressed were identified with matrix-assisted laser desorption/ionization time-of-flight/ time-of-flight mass spectrometry (MALDI-TOF/TOF MS) analysis. We identified 30 proteins from mild HFMD samples and 39 proteins from severe HFMD samples, compared with the normal controls. 25 proteins among them (14 up-regulated and 11 down-regulated proteins) are found in both HFMD groups. Classification analysis and protein-protein interaction map showed that they associate with multiple functional groups, including transporter activity and atalytic activity. These findings build up a comprehensive profile of the HFMD proteome and provide a useful basis for further analysis of the pathogenic mechanism and the regulatory network of HFMD.
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673
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Sakai N, Zhu L, Kurokawa A, Takeuchi H, Yano S, Yanoh T, Wada N, Taira S, Hosokai Y, Usui A, Machida Y, Saito H, Ichiyanagi Y. Synthesis of Gd2O3nanoparticles for MRI contrast agents. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/352/1/012008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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674
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Fernández A, Jespersen K, Zhu L, Grüner-Nielsen L, Baltuška A, Galvanauskas A, Verhoef AJ. High-fidelity, 160 fs, 5 μJ pulses from an integrated Yb-fiber laser system with a fiber stretcher matching a simple grating compressor. OPTICS LETTERS 2012; 37:927-929. [PMID: 22378441 DOI: 10.1364/ol.37.000927] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Although femtosecond microjoule Yb-fiber systems are attractive because of a straightforward power scalability, they inherently suffer from a lowered pulse fidelity as a result of complex dispersion and nonlinearity management. Here, we present an integrated Yb-fiber system delivering high-fidelity microjoule pulses compressible down to 160 fs. The system uses a dispersion compensating fiber stretcher that is specially designed to match the dispersion of a 1480 lines/mm grating compressor. Performance analysis suggests the further possibility of scaling the pulse energy to tens of microjoules without pulse quality deterioration using this dispersion management scheme.
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Zhu L, Stewart D, Reineke K, Ravishankar S, Palumbo S, Cirigliano M, Tortorello M. Comparison of swab transport media for recovery of Listeria monocytogenes from environmental samples. J Food Prot 2012; 75:580-4. [PMID: 22410235 DOI: 10.4315/0362-028x.jfp-11-386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Environmental monitoring is recognized as an important strategy for controlling Listeria monocytogenes in food processing facilities. Samples are taken by swabbing environmental surfaces, and the swabs are immersed in a medium for transport to the laboratory. In this study, buffered peptone water (BPW), Dey-Engley neutralizing broth (DE), neutralizing buffer (NB), Letheen broth (LE), and newly described MCC buffer (MCC) were evaluated as transport media for recovery of sanitizer-stressed L. monocytogenes from inoculated swabs. After storage at 4°C, the media performed similarly, but at 25°C relative recovery efficiency from the inoculated sponges was DE > LE > BPW > MCC > NB. Recoveries from stainless steel surfaces followed similar trends. MCC, DE, and NB were compared for L. monocytogenes recovery in the presence of Escherichia coli, Enterococcus faecalis, Lactobacillus plantarum, Pseudomonas fluorescens, and Listeria innocua. After 4°C storage, all population levels changed little; after 25°C storage, DE allowed the best growth of L. monocytogenes regardless of other species present. MCC, DE, and NB performed similarly for recovery of L. monocytogenes from an artificial milk biofilm and for recovery of Listeria spp. from swabs obtained from a meat processing facility. Transport medium formulation, time and temperature of swab storage, and coexistence of other species affect recovery of sanitizer-stressed L. monocytogenes from environmental swabs. The study confirms the need to maintain 4°C storage conditions during swab transport.
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