101
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Qi TF, Korneta OB, Parkin S, De Long LE, Schlottmann P, Cao G. Negative volume thermal expansion via orbital and magnetic orders in Ca₂Ru₁-(x)Cr(x)O₄(0 < x < 0.13). PHYSICAL REVIEW LETTERS 2010; 105:177203. [PMID: 21231076 DOI: 10.1103/physrevlett.105.177203] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2010] [Indexed: 05/30/2023]
Abstract
Ca₂RuO₄ undergoes a metal-insulator transition at T(MI)=357 K, followed by a well-separated transition to antiferromagnetic order at T(N)=110 K. Dilute Cr doping for Ru reduces the temperature of the orthorhombic distortion at T(MI) and induces ferromagnetic behavior at T(C). The lattice volume V of Ca₂Ru₁-(x)Cr(x)O₄ (0 < x < 0.13) abruptly expands with cooling at both T(MI) and T(C), giving rise to a total volume expansion ΔV/V ≈ 1%, which sharply contrasts the smooth temperature dependence of the few known examples of negative volume thermal expansion driven by anharmonic phonon modes. In addition, the near absence of volume thermal expansion between T(C) and T(MI) represents an Invar effect. The two phase transitions, which surprisingly mimic the classic freezing transition of water, suggest an exotic ground state driven by an extraordinary coupling between spin, orbit, and lattice degrees of freedom.
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102
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Fadda S, Cincotti A, Cao G. Rationalizing the equilibration and cooling stages of cryopreservation: The effect of cell size distribution. AIChE J 2010. [DOI: 10.1002/aic.12320] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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103
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Mancuso L, Liuzzo MI, Fadda S, Pisu M, Cincotti A, Arras M, La Nasa G, Concas A, Cao G. In vitro ovine articular chondrocyte proliferation: experiments and modelling. Cell Prolif 2010; 43:310-20. [PMID: 20412130 DOI: 10.1111/j.1365-2184.2010.00676.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
This study focuses on analysis of in vitro cultures of chondrocytes from ovine articular cartilage. Isolated cells were seeded in Petri dishes, then expanded to confluence and phenotypically characterized by flow cytometry. The sigmoidal temporal profile of total counts was obtained by classic haemocytometry and corresponding cell size distributions were measured electronically using a Coulter Counter. A mathematical model recently proposed (1) was adopted for quantitative interpretation of these experimental data. The model is based on a 1-D (that is, mass-structured), single-staged population balance approach capable of taking into account contact inhibition at confluence. The model's parameters were determined by fitting measured total cell counts and size distributions. Model reliability was verified by predicting cell proliferation counts and corresponding size distributions at culture times longer than those used when tuning the model's parameters. It was found that adoption of cell mass as the intrinsic characteristic of a growing chondrocyte population enables sigmoidal temporal profiles of total counts in the Petri dish, as well as cell size distributions at 'balanced growth', to be adequately predicted.
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104
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Du C, Li H, Cao G, Xilingaowa, Wang C, Li C. Expression of the Orexigenic Peptide Ghrelin and the Type 1a Growth Hormone Secretagogue Receptor in Sheep Oocytes and Pre-implantation Embryos ProducedIn Vitro. Reprod Domest Anim 2010; 45:92-8. [DOI: 10.1111/j.1439-0531.2008.01259.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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105
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Stetler RA, Gao Y, Signore AP, Cao G, Chen J. HSP27: mechanisms of cellular protection against neuronal injury. Curr Mol Med 2010; 9:863-72. [PMID: 19860665 DOI: 10.2174/156652409789105561] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The heat shock protein (HSP) family has long been associated with a generalized cellular stress response, particularly in terms of recognizing and chaperoning misfolded proteins. While HSPs in general appear to be protective, HSP27 has recently emerged as a particularly potent neuroprotectant in a number of diverse neurological disorders, ranging from ALS to stroke. Although its robust protective effect on a number of insults has been recognized, the mechanisms and regulation of HSP27's protective actions are still undergoing intense investigation. On the basis of recent studies, HSP27 appears to have a dynamic and diverse range of function in cellular survival. This review provides a forum to compare and contrast recent literature exploring the protective mechanism and regulation of HSP27, focusing on neurological disorders in particular, as they represent a range from protein aggregate-associated diseases to acute stress.
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106
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Zhao Y, Li N, Xiao L, Cao G, Chen Y, Zhang S, Chen Y, Wu C, Zhang J, Sun S, Xu X. FSHB subunit gene is associated with major gene controlling litter size in commercial pig breeds. ACTA ACUST UNITED AC 2009; 41:664-8. [PMID: 18726224 DOI: 10.1007/bf02882910] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/1998] [Indexed: 11/26/2022]
Abstract
An insertion fragment in porcine FSHbeta subunit gene was cloned by PCR. Sequencing data show that the insertion is a retroposon of 292 bp sitting in intron I at the site between + 809 and +810 base. Based on these results, a PCR programme was created to genotype animal individuals in different pig breeds at FSW locus and polymorphism of FSHbeta gene was analyzed. With the combination of genotype and litter size of sows, it was demonstrated that FSHbeta locus is closely associated with major gene controlling litter size in commercial pig breeds, such as Yorkshire, Landrace, Durco. Averagely the AA sows give more 1.5 piglets than BB sows do per litter.
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107
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He LM, Cao G, Hu AX. 2-(2-Amino-5-methylthiazol-4-yl)phenol. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o2161. [PMID: 21577569 PMCID: PMC2970029 DOI: 10.1107/s160053680903164x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Accepted: 08/11/2009] [Indexed: 11/28/2022]
Abstract
In the title compound, C10H10N2OS, the benzene ring is nearly co-planar with the thiazole ring, making a dihedral angle of 2.1 (2)°. The crystal structure is stabilized by intermolecular N—H⋯O hydrogen bonds. An intramolecular O—H⋯N hydrogen bond is also present.
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108
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Ali FEA, Cao G, Poudyal A, Vaara T, Nation RL, Vaara M, Li J. Pharmacokinetics of novel antimicrobial cationic peptides NAB 7061 and NAB 739 in rats following intravenous administration. J Antimicrob Chemother 2009; 64:1067-70. [DOI: 10.1093/jac/dkp331] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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109
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Chen ZJ, Cao G, Tang WX, Lv XY, Huang SM, Qin W, Ping F, Ye T. A randomized controlled trial of high-permeability haemodialysis against conventional haemodialysis in the treatment of uraemic pruritus. Clin Exp Dermatol 2009; 34:679-83. [DOI: 10.1111/j.1365-2230.2008.03075.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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110
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Mancuso L, Liuzzo MI, Fadda S, Pisu M, Cincotti A, Arras M, Desogus E, Piras F, Piga G, La Nasa G, Concas A, Cao G. Experimental analysis and modelling of in vitro proliferation of mesenchymal stem cells. Cell Prolif 2009; 42:602-16. [PMID: 19614674 DOI: 10.1111/j.1365-2184.2009.00626.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES Stem cell therapies based on differentiation of adult or embryonic stem cells into specialized ones appear to be effective for treating several human diseases. This work addresses the mathematical simulation of proliferation kinetics of stem cells. MATERIALS AND METHODS Sheep bone marrow mesenchymal stem cells (phenotype characterized by flow cytometry analysis) seeded at different initial concentrations in Petri dishes were expanded to confluence. Sigmoid temporal profiles of total counts obtained through classic haemocytometry were quantitatively interpreted by both a phenomenological logistic equation and a novel model based on a one-dimensional, single-staged population balance approach capable of taking into account contact inhibition at confluence. The models' parameters were determined by comparison with experimental data on population expansion starting from single seeding concentration. Reliability of the models was tested by predicting cell proliferation carried out starting from different seeding concentrations. RESULTS AND DISCUSSION It was found that the proposed population balance modelling approach was successful in predicting the experimental data over the whole range of initial cell numbers investigated, while prediction capability of phenomenological logistic equation was more limited.
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111
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Porcel JM, Vives M, Cao G, Bielsa S, Ruiz-González A, Martínez-Iribarren A, Esquerda A. Biomarkers of infection for the differential diagnosis of pleural effusions. Eur Respir J 2009; 34:1383-9. [PMID: 19541708 DOI: 10.1183/09031936.00197208] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We aimed to investigate whether pleural fluid concentrations of biomarkers for bacterial infection, namely triggering receptor expressed on myeloid cells (sTREM-1), procalcitonin (PCT), lipopolysaccharide-binding protein (LBP) and C-reactive protein (CRP), might identify infectious effusions and discriminate between complicated (CPPEs) and uncomplicated parapneumonic effusions (UPPEs). Stored pleural fluid samples from 308 patients with different causes of pleural effusion were used to measure the four biomarkers. Receiver-operating characteristic analysis determined the accuracy of the new tests. Median pleural fluid levels of CRP, sTREM-1 and LBP were significantly higher in CPPE compared with those in other aetiologies. The area under the curve for distinguishing infectious (parapneumonics and tuberculosis) from noninfectious effusions was 0.87 for CRP, 0.86 for sTREM-1, 0.57 for PCT and 0.87 for LBP. Regarding the discrimination of nonpurulent CPPE versus UPPE, a multivariate analysis found that pleural fluid glucose < or =60 mg x dL(-1), LBP > or =17 microg x mL(-1) and CRP > or =80 mg x L(-1) were the best parameters. Individually, none of the new biomarkers achieved better performance characteristics than pH, glucose or lactate dehydrogenase in labelling CPPE. In conclusion, elevated pleural fluid levels of CRP, sTREM and LBP identify patients with infectious effusions, particularly those with CPPE. PCT has no value for the differential diagnosis of pleural effusions.
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112
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Cao G, Lee YZ, Peng R, Liu Z, Rajaram R, Calderon-Colon X, An L, Wang P, Phan T, Sultana S, Lalush DS, Lu JP, Zhou O. A dynamic micro-CT scanner based on a carbon nanotube field emission x-ray source. Phys Med Biol 2009; 54:2323-40. [PMID: 19321922 DOI: 10.1088/0031-9155/54/8/005] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Current commercial micro-CT scanners have the capability of imaging objects ex vivo with high spatial resolution, but performing in vivo micro-CT on free-breathing small animals is still challenging because their physiological motions are non-periodic and much faster than those of humans. In this paper, we present a prototype physiologically gated micro-computed tomography (micro-CT) scanner based on a carbon nanotube field emission micro-focus x-ray source. The novel x-ray source allows x-ray pulses and imaging sequences to be readily synchronized and gated to non-periodic physiological signals from small animals. The system performance is evaluated using phantoms and sacrificed and anesthetized mice. Prospective respiratory-gated micro-CT images of anesthetized free-breathing mice were collected using this scanner at 50 ms temporal resolution and 6.2 lp mm(-1) at 10% system MTF. The high spatial and temporal resolutions of the micro-CT scanner make it well suited for high-resolution imaging of free-breathing small animals.
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113
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Chen S, Yang X, Cao G. Impulse noise suppression with an augmentation of ordered difference noise detector and an adaptive variational method. Pattern Recognit Lett 2009. [DOI: 10.1016/j.patrec.2008.10.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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114
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Li J, Nation RL, Cao G, Ali FEA, Chiu F, Zavascki AP. Development and validation of a reversed-phase high-performance liquid chromatography assay for polymyxin B in human plasma--authors' response. J Antimicrob Chemother 2009. [DOI: 10.1093/jac/dkn524] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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115
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Fadda S, Cincotti A, Cao G. The effect of cell size distribution during the cooling stage of cryopreservation without CPA. AIChE J 2009. [DOI: 10.1002/aic.12137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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116
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Wang YT, Xia L, Hu AX, Cao G, Xu JJ. 2-Amino-4- tert-butyl-5-(4-chlorobenzyl)thiazole. Acta Crystallogr Sect E Struct Rep Online 2008; 64:o2350. [PMID: 21581324 PMCID: PMC2959929 DOI: 10.1107/s160053680803715x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2008] [Accepted: 11/10/2008] [Indexed: 11/10/2022]
Abstract
In the title compound, C14H17ClN2S, the dihedral angle between the planes of the thiazole and chlorophenyl rings is 88.86 (3)°. In the crystal, inversion dimers occur, linked by pairs of N—H⋯N hydrogen bonds.
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117
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Moon SJ, Jin H, Kim KW, Choi WS, Lee YS, Yu J, Cao G, Sumi A, Funakubo H, Bernhard C, Noh TW. Dimensionality-controlled insulator-metal transition and correlated metallic state in 5d transition metal oxides Sr n+1Ir nO3n+1 (n=1, 2, and infinity). PHYSICAL REVIEW LETTERS 2008; 101:226402. [PMID: 19113493 DOI: 10.1103/physrevlett.101.226402] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Indexed: 05/27/2023]
Abstract
We investigated the electronic structures of the 5d Ruddlesden-Popper series Sr n+1Ir nO3n+1 (n=1, 2, and infinity) using optical spectroscopy and first-principles calculations. As 5d orbitals are spatially more extended than 3d or 4d orbitals, it has been widely accepted that correlation effects are minimal in 5d compounds. However, we observed a Mott insulator-metal transition with a change of bandwidth as we increased n. In addition, the artificially synthesized perovskite SrIrO3 showed a very large mass enhancement of about 6, indicating that it was in a correlated metallic state.
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118
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Barquera S, Durazo-Arvizu RA, Luke A, Cao G, Cooper RS. Erratum: Hypertension in Mexico and among Mexican Americans: prevalence and treatment patterns. J Hum Hypertens 2008. [DOI: 10.1038/jhh.2008.49] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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119
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Kim BJ, Jin H, Moon SJ, Kim JY, Park BG, Leem CS, Yu J, Noh TW, Kim C, Oh SJ, Park JH, Durairaj V, Cao G, Rotenberg E. Novel Jeff=1/2 Mott state induced by relativistic spin-orbit coupling in Sr2IrO4. PHYSICAL REVIEW LETTERS 2008; 101:076402. [PMID: 18764560 DOI: 10.1103/physrevlett.101.076402] [Citation(s) in RCA: 352] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Indexed: 05/23/2023]
Abstract
We investigated the electronic structure of 5d transition-metal oxide Sr2IrO4 using angle-resolved photoemission, optical conductivity, x-ray absorption measurements, and first-principles band calculations. The system was found to be well described by novel effective total angular momentum Jeff states, in which the relativistic spin-orbit coupling is fully taken into account under a large crystal field. Despite delocalized Ir 5d states, the Jeff states form such narrow bands that even a small correlation energy leads to the Jeff=1/2 Mott ground state with unique electronic and magnetic behaviors, suggesting a new class of Jeff quantum spin driven correlated-electron phenomena.
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120
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Conington J, Cao G, Stott A, Bünger L. Breeding for resistance to mastitis in United Kingdom sheep, a review and economic appraisal. Vet Rec 2008; 162:369-76. [PMID: 18359930 DOI: 10.1136/vr.162.12.369] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Mastitis is a problem in the sheep industry, and its incidence varies widely with how it is recorded, the breed of sheep and the farm. Virtually all the published information about the genetics of mastitis refers to dairy breeds of cattle and sheep, and there is little information for meat sheep breeds. Many dairy breeding programmes worldwide use the somatic cell count (scc) in milk as an indicator of resistance to clinical and subclinical mastitis, but it is difficult to measure in meat sheep breeds. Molecular genetic technologies may therefore be a more practical way to assess susceptibility to mastitis. This paper reviews the genetics of mastitis and considers the opportunities for breeding for resistance to mastitis, with particular reference to sheep. In addition, to investigate the potential economic effects of mastitis in a purebred sheep population, a computer model of flock dynamics was developed. By making a modest set of assumptions about the key farm parameters that influence lowland sheep production, the model showed that breeding for resistance (or other control methods), if it could reduce the risk of contracting mastitis by 10 per cent, would be worth pounds 8.40 per ewe, equivalent annually to pounds 2.7 million for the purebred sector of the Texel breed alone.
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121
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Cao G, Peng R, Lee Y, Rajaram R, Calderon-Colon X, An L, Phan T, Lalush D, Lu J, Zhou O. SU-GG-J-16: A Physiologically Gated Micro-CT Scanner for Dynamic Small Animal Imaging Based On a Carbon Nanotube X-Ray Source. Med Phys 2008. [DOI: 10.1118/1.2961573] [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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122
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Cao G, Navacchia D, Zárate JO. [Unilateral nonsyndromic cryptophthalmos]. An Pediatr (Barc) 2008; 68:194-5. [PMID: 18341891 DOI: 10.1157/13116240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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123
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Barquera S, Durazo-Arvizu RA, Luke A, Cao G, Cooper RS. Hypertension in Mexico and among Mexican Americans: prevalence and treatment patterns. J Hum Hypertens 2008; 22:617-26. [PMID: 18305546 DOI: 10.1038/jhh.2008.9] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Increased social and economic integration across the US-Mexican borders has led to important new developments in public health. Lower levels of cardiovascular mortality have been observed among Mexican Americans (MAs) although few direct comparisons have been undertaken with Mexico. Using survey data in the respective countries we examined blood pressure (BP) levels, hypertension prevalence and patterns of awareness, treatment and control in Mexico and among MAs. A national representative sample of the adult population from Mexico collected in 2000 (N=49 294), and data on 8688 MA participants in the 1999-2004 National Health and Nutrition Examination survey from the United States were available for analysis. US-born MAs and those born in Mexico were analysed separately in the US data. Lack of direct standardization of methods between surveys necessitated statistical adjustment of BP values. Analyses were based on persons aged 25-64 in each country. Sex- and age-adjusted mean systolic/diastolic BPs were 122/80, 119/71 and 120/73 in Mexicans, immigrant MAs and US-born MAs, respectively. The prevalences of hypertension (BP > or = 140/90 or treatment) were 33, 17 and 22%. Hypertension control rates were 3.7, 32.1 and 37.9%, in the same groups. Awareness and treatment rates were 25 and 13% in Mexico and 54 and 46% among MAs in the United States, respectively. Hypertension appears to be more common in Mexico than among Mexican immigrants to the United States. Despite relatively low access to health insurance in the United States, hypertension control increased over the course of this migration.
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124
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Cao G, Durairaj V, Chikara S, DeLong LE, Schlottmann P. Observation of strong spin valve effect in bulk Ca3(Ru1-xCrx)2O7. PHYSICAL REVIEW LETTERS 2008; 100:016604. [PMID: 18232800 DOI: 10.1103/physrevlett.100.016604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2007] [Indexed: 05/25/2023]
Abstract
The spin-valve effect is a quantum phenomenon so far only realized in multilayer thin films or heterostructures. Here we report a strong spin-valve effect existing in bulk single crystals of Ca3(Ru1-xCrx)2O7 having an anisotropic, bilayered crystal structure. This discovery opens new avenues to understand the underlying physics of spin valves, and fully realize its potential in practical devices.
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125
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Zhang J, Zhang Y, Shi Y, Rui J, Yu J, Cao G, Wu J. Population pharmacokinetic and pharmacodynamic modeling of norvancomycin. Eur J Clin Microbiol Infect Dis 2008; 27:275-84. [DOI: 10.1007/s10096-007-0435-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2007] [Accepted: 11/19/2007] [Indexed: 11/30/2022]
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