Grain storage temperature prediction based on chaos and enhanced RBF neural network.

Grain storage has very strict temperature requirements. Aiming at the problems of nonlinear characteristics and poor prediction accuracy of temperature parameters in grain storage, a combination of chaos theory and enhanced radial basis neural network is proposed as a temperature prediction model for grain storage (C-ERBF). The model first determines the embedding dimension and time delay of the grain storage temperature sequence using chaos theory. It then calculates the Lyapunov exponent to confirm its chaotic properties and reconstructs the sequence in the phase space to extract the hidden dynamic information and structure behind the sequence. Furthermore, the q-Normalized Least Mean Square Fourth (qXE-NLMF) algorithm is designed to enhance the radial basis function (RBF) neural network model for weight updating, to improve its prediction accuracy, and to accelerate the training speed of the model. As verified by the simulation experiments of Mackey-Glass chaotic time series prediction, the enhanced RBF (ERBF) network has faster convergence speed and lower steady-state error compared to the traditional RBF network. Finally, the optimized dataset from chaos theory is input into the model to achieve accurate predictions of grain storage temperature series. The experimental results show that the proposed C-ERBF model has higher prediction accuracy compared to other time series prediction methods. It can realize the grain pile temperature in advance, and take control measures in advance. This proactive approach significantly reduces the consumption of stored grain and prevents issues before they arise.

Treg Cell Evaluation in Patients with Acquired Immune Deficiency Syndrome with Poor Immune Reconstitution and Human Immunodeficiency Virus-Infected Treg Cell Prevention by Polymeric Nanoparticle Drug Delivery System.

To better deliver antiretroviral drugs for treating patients with acquired immune deficiency syndrome (AIDS) with poor immune reconstitution, a novel nanopole capsule was designed in this study. Forty-eight patients with AIDS with poor immune reconstitution were chosen as subjects to test their immune state. CD4+ T and Regulatory T cells (Treg) infected with HIV were cultured to test polyethyleneimine (PEI) and polychitosan (PC) drug delivery system efficiency. The infiltration efficiency test was performed to study the drug delivery efficiency of the delivery systems, and the cell numbers of CD4+ T and Treg cells infected with HIV were calculated to evaluate the therapeutic effect. The results showed that patients with AIDS with poor immune reconstitution had lower CD4+ T cell count and higher Treg cell count. Furthermore, the infiltration efficiency of the PC drug delivery system was higher than that of the PEI drug delivery system, and the therapy efficiency of antiretroviral drugs was greatly improved in the PC group. Additionally, the improvement of CD4+ T and Treg cells damaged by HIV was greater in the PC group. Sequentially, the PC system can better deliver and release loaded antiretroviral drugs and may be a better choice for treating patients with AIDS with poor immune reconstitution in the future.

Responses after one dose of a monovalent influenza A (H1N1) 2009 inactivated vaccine in Chinese population--a practical observation.

BACKGROUND: The globally large-scale immunization was the most important method of controlling the 2009 pandemic influenza. METHODS: We conducted an observational clinical trial, including 148 adults aged 18-60 years to evaluate the safety and immunogenicity of a licensed 2009 H1N1 influenza vaccine. All subjects received a single 15-µg dose of a monovalent, unadjuvanted inactivated vaccine. Antibody titers were measured by means of hemagglutinin-inhibition assays and neutralization assays based on Real-Time Cell Analyzer (RTCA) instruments at baseline, 7 days and 21 days after vaccination. RESULTS: Local and systemic reactions were respectively reported by 19.1% and 22.1% of subjects. All adverse events were mild to moderate in intensity, without any deaths or serious events. By day 21 after vaccination, hemagglutinin-inhibition antibody titers of 1:40 or more were achieved in 101 of 123 (82.1%) subjects and the geometric mean titers (GMTs) increased to 1:95.27. For neutralization assays, all subjects could provide the protection against wide influenza virus, with the GMT of 1:525.44. Moreover, the rates of seroconversion, as measured using hemagglutinin-inhibition assays and neutralization assays, were 73.98% and 91.87% of subjects, respectively. CONCLUSIONS: A single 15-µg dose of a monovalent, unadjuvanted inactivated 2009 H1N1 influenza vaccine was well tolerated, and induced a protective immune response in the majority of subjects aged 18-60 years (clinical trials gov number, NCT01055990).

[Markers of endothelial injury and plasma adipocytokine in antiretroviral-naive HIV patients].

OBJECTIVES: To investigate the markers of endothelial injury, adipocytokine and thrombotic activity and explore whether there are cardiovascular disease risk factors in antiretroviral-naive HIV patients. METHODS: Clinical data and venous blood samples were collected from 43 anti-retroviral naive HIV-infected patients during February-October 2009 in our center, and compared with 17 healthy subjects. Plasma leptin, adiponectin, soluble intercellular adhesion molecule-1 (sICAM-1), D-dimer were measured by ELISA. Four markers and cholesterol, triglyceride, fasting plasma glucose were compared between the two groups. The CD(4)(+)T cells and percentages of CD(38), HLA-DR on CD(8)(+)T were determined by flow cytometry and plasma HIV copies were detected with bDNA analyzer among HIV-infected participants. Spearman correlations between the significant markers and CD(4)(+) T cells, CD(8)(+) CD(38)(+)/CD(8)(+), CD(8)(+) HLA-DR(+)/CD(8)(+), HIV viral load were examined among HIV-infected participants. Analyses were conducted by using Stata version 7. RESULTS: Thirty-eight of the 43 patients were sexually infected by HIV and the median absolute CD(4)(+)T cell count was (133 ± 82) cells/µl, HIV RNA was (4.42 ± 0.66) lg copies/ml. HIV-infected patients, compared with healthy subjects, had lower leptin [11.41(7.91, 14.53) µg/L vs 55.31 (16.49, 229.65) µg/L, P = 0.0005], adiponectin [1.79 (1.40, 4.00) mg/L vs 3.36 (2.92, 4.18) mg/L, P = 0.003] and higher sICAM-1 [1.71(1.11, 2.40) mg/L vs 0.69 (0.57, 0.80) mg/L, P = 0.0000]. No significant differences exist in cholesterol, triglyceride, fasting plasma glucose. For HIV-infected participants, sICAM-1 tended to correlate with CD(8)(+)CD(38)(+)/CD(8)(+) and HIV viral load (r = 0.3378, P = 0.0267; r = 0.3904, P = 0.0096). CONCLUSION: Patients with untreated HIV infection have lower leptin, adiponectin and higher sICAM-1 levels and the relationship of these markers to HIV-mediated atherosclerotic risk requires further study.

T-SPOT.TB in the diagnosis of active tuberculosis among HIV-infected patients with advanced immunodeficiency.

We evaluated the performance of T-SPOT.TB (a commercial interferon gamma release assay) and its accuracy for the diagnosis of active tuberculosis (TB) among HIV-infected subjects with advanced immunodeficiency. In a clinical prospective study, we assessed the performance of T-SPOT.TB for the diagnosis of active TB in HIV-infected patients with CD4 cell counts below 350 cells/mm(3) who were naive to antiretroviral and anti-TB therapies. Results were available from 147 patients, of whom 38 (25.9%) had active TB. The majority (85%) of the participants were male, with a median age of 40 years and a median CD4 cell count of 77 cells/mm(3). T-SPOT.TB yielded 15 (10.2%) indeterminate results. The indeterminate results were not associated with CD4 cell counts. However, younger patients were more likely to have an indeterminate result (OR = 0.91 per unit increase in age, p = 0.007). After excluding the indeterminate results, the sensitivity of T-SPOT.TB for the diagnosis of active TB was 37.1% and the specificity was 88.7%. The sensitivity of the T-SPOT.TB was independent of the CD4 cell count. However, its specificity was higher when used for patients with CD4 cell counts <100 cells/mm(3) when compared to patients with CD4 cell counts ≥100 cells/mm(3) (97.9% vs. 79.6%, p = 0.008). T-SPOT.TB could not be used as a routine tool to screen for active TB among HIV-infected patients with advanced immunodeficiency because of its poor performance and low sensitivity. However, it may be used as an adjunctive tool to diagnose active TB in this population due to its high specificity.

CYP2B6 polymorphism and nonnucleoside reverse transcriptase inhibitor plasma concentrations in Chinese HIV-infected patients.

The purpose of this study was to investigate the frequency of CYP2B6 polymorphisms and their influence on plasma concentrations of efavirenz and nevirapine in HIV-infected Chinese patients. After written informed consent, 159 patients were enrolled at Shanghai Public Health Clinical Center. Genotyping for 516 G>T, 785 A>G, 983 T>C, and 1459 T>C polymorphisms in CYP2B6, together with CYP3A4 -392 A>G, CYP3A5 6986 A>G, and ABCB1 (2677 G>T/A, 3435 C>T), were performed. Plasma efavirenz and nevirapine concentrations of 120 patients at steady state were assessed by high-performance liquid chromatography-mass spectrometry. The minor allele frequency for CYP2B6 516 G>T, 785 A>G, 983 T>C, and 1459 T>C was 0.16, 0.24, 0, and 0, respectively; and 0.07, 0.32, 0.15, and 0.35 for CYP3A4 -392 A>G, CYP3A5 6986 A>G, ABCB1 2677 G>T/A, and ABCB1 3435 C>T, respectively. Univariate analysis indicated associations between 516 G>T (P < 0.01) with efavirenz but not nevirapine plasma concentrations. None of other genetic variants was associated with plasma efavirenz or nevirapine concentrations. Although CYP2B6 516 G>T was associated with high plasma efavirenz concentrations, such an association was not evident with nevirapine in this Chinese patient population. CYP3A4 -392 A>G, CYP3A5 6986 A>G, and ABCB1 (2677 G>T/A, 3435 C>T) had no significant impact on plasma efavirenz or nevirapine concentrations.

Integer programming-based approach to allocation of reporter genes for cell array analysis.

In this paper, we consider the problem of selecting the most effective set of reporter genes for analysis of biological networks using cell microarrays. We propose two graph theoretic formulations of the reporter gene allocation problem, and show that both problems are hard to approximate. We propose integer programming-based methods for solving practical instances of these problems optimally. We apply them to apoptosis pathway maps, and discuss the biological significance of the result. We also apply them to artificial networks, the result of which shows that optimal solutions can be obtained within several seconds for networks with 10,000 nodes.

Gene systems network inferred from expression profiles in hepatocellular carcinogenesis by graphical Gaussian model.

Hepatocellular carcinoma (HCC) in a liver with advanced-stage chronic hepatitis C (CHC) is induced by hepatitis C virus, which chronically infects about 170 million people worldwide. To elucidate the associations between gene groups in hepatocellular carcinogenesis, we analyzed the profiles of the genes characteristically expressed in the CHC and HCC cell stages by a statistical method for inferring the network between gene systems based on the graphical Gaussian model. A systematic evaluation of the inferred network in terms of the biological knowledge revealed that the inferred network was strongly involved in the known gene-gene interactions with high significance (P < 10(-4)), and that the clusters characterized by different cancer-related responses were associated with those of the gene groups related to metabolic pathways and morphological events. Although some relationships in the network remain to be interpreted, the analyses revealed a snapshot of the orchestrated expression of cancer-related groups and some pathways related with metabolisms and morphological events in hepatocellular carcinogenesis, and thus provide possible clues on the disease mechanism and insights that address the gap between molecular and clinical assessments.

Apoptosis and its pathway in early post-implantation embryos of diabetic rats.

It has been reported that diabetes-induced inappropriate apoptosis in embryos during neurulation may be one of the mechanisms leading to neural tube defects. We studied apoptosis and the apoptotic pathway occurring in early post-implantation period embryos of non-diabetic and streptozotocin (STZ)-induced diabetic rats. In quantitative RT-PCR, bax mRNA was constantly expressed to similar degree in embryos of non-diabetic and diabetic rats, while the expression of bcl-2 mRNA was significantly decreased in diabetic rat embryos compared to non-diabetic rat embryos. The increased number of terminal deoxynucleotidyl transferase-mediated nick end labeling (TUNEL)-positive cells occurred selectively in the primitive brains of diabetic rat embryos compared to non-diabetic rat embryos. Immunohistochemical studies revealed that, in mirror sections, the staining of Bax and activated caspase-3 were observed in the TUNEL-positive cell area, but the expression of Bcl-2 in these apoptotic cells was generally too low to be detected. These results suggest that a Bax-regulated mitochondrial cytochrome c-mediated caspase-3 activation pathway might be involved in the diabetic embryopathy.

Association between IL-18 gene promoter polymorphisms and CTLA-4 gene 49A/G polymorphism in Japanese patients with type 1 diabetes.

Interleukin-18 (IL-18) is a potent proinflammatory cytokine which is strongly associated with the development of diabetes in NOD mice. To test the putative involvement of IL-18 gene polymorphism in predisposition to human type 1 diabetes, the SNPs at position -607 (C/A) and -137 (G/C) in the promoter region of IL-18 gene were analyzed by sequence-specific PCR in 116 patients with type 1 diabetes and 114 normal controls. A linkage disequilibrium found only three of the four possible haplotypes defined by these SNPs. The distribution of the IL-18 gene genotypes at position -607 was significantly different between patients with type 1 diabetes and normal controls (P=0.023). Furthermore, there was a significant increase in haplotype 1 (-607C/-137G) in the patients compared with controls (P=0.006). The association study of the susceptible CTLA-4 genotype (GG at nucleotide position 49 in exon 1) or HLA-DR4-DQB1*0401 and type 1 diabetes showed that the predisposing IL-18 gene haplotype modulates the risk on CTLA-4 GG genotype, but not on HLA-DR4-DQB1*0401 haplotype. Among subjects carrying the CTLA-4 GG genotype, the frequency of IL-18 haplotype 1 in patients with type 1 diabetes was significantly higher than that in controls (91% vs. 71%, P=0.012). However, IL-18 haplotype 1 was not frequent in patients who do not exhibit the CTLA-4 high-risk genotype. These results suggest that the IL-18 gene polymorphism is associated with a type 1 diabetes susceptibility, and there might be a gene-gene interaction between IL-18 gene with susceptible CTLA-4 gene.

Restricted expression and photic induction of a novel mouse regulatory factor X4 transcript in the suprachiasmatic nucleus.

The regulatory factor X (RFX) family of transcription factors is characterized by a unique and highly conserved 76-amino acid residue DNA-binding domain. Mammals have five RFX genes, but the physiological functions of their products are unknown, with the exception of RFX5. Here a mouse RFX4 transcript was identified that encodes a peptide of 735 amino acids, including the DNA-binding domain. Its expression was localized in the suprachiasmatic nucleus, the central pacemaker site of the circadian clock. Also, light exposure was found to induce its gene expression in a subjective night-specific manner. Polyclonal antibodies were prepared, and an 80-kDa band was detected in the suprachiasmatic nucleus by Western hybridization. A histochemical study showed a localization of the products in the nucleus. This is the first report on mouse RFX4, which contains the RFX DNA-binding motif. Our investigation may provide clues to the physiological function of RFX4.

In vivo expression of B:9-23 peptide/I-A(g7) complex may abrogate the inhibition of diabetes induced by RGD-fiber-mutant adenovirus in NOD mice.

Insulin B chain peptide B:9-23 given to NOD mice decreases the development of diabetes, and phase II trials of an altered peptide ligand of B:9-23 are under way in humans. We have created a gene for the NOD MHC class II beta chain, covalently linked to the B:9-23 peptide. B lymphoma cells transfected with the gene stimulated NOD islet-derived B:9-23 reactive T cell clones in vitro. In this study, we generated an RGD-fiber-mutant adenovirus vector encoding the covalent B:9-23 peptide/I-A(g7) gene (Ad-RGD-B:9-23) to test whether in vivo expression of the gene could protect NOD mice from diabetes. NOD female mice were injected intramuscularly with 5 x 10(8) PFU of Ad-RGD-B:9-23 and empty RGD-adenovirus vector. A single administration of the empty vector did not alter the expression of insulin autoantibodies, but delayed the onset of diabetes in NOD mice. In contrast, Ad-RGD-B:9-23 immunization induced an early expression of insulin autoantibodies, but did not change the disease occurrence compared to control NOD mice. Our results suggest that adenovirus infection could confer protection from diabetes in NOD mice. The in vivo expression of covalent B:9-23 peptide/class II complex by adenovirus gene transfer might activate anti-insulin autoimmunity, resulting in abrogation of the inhibition of diabetes induced by an RGD-fiber-mutant adenovirus vector.

Interleukin-10 gene promoter region polymorphisms in patients with type 1 diabetes and autoimmune thyroid disease.

Type 1 diabetes is a heterogeneous autoimmune disease and is frequently associated with other organ-specific autoimmune diseases, including autoimmune thyroid disease (AITD). Type 1 diabetic patients with AITD are known to show distinct clinical and immunological features from patients without AITD. This study investigated whether interleukin-10 (IL-10) gene promoter region polymorphisms are associated with susceptibility to type 1 diabetes and AITD. The frequency of -1082G/A, -819C/T, and -592C/A polymorphisms was analyzed in 54 type 1 diabetic patients with AITD, 74 type 1 diabetic patients without AITD, 124 nondiabetic patients with AITD, and 107 healthy subjects in a case-control study. No significant differences on the allele and genotype frequencies of three polymorphisms were found not only in type 1 diabetic patients with AITD compared with normal controls, but also between nondiabetic patients with AITD and healthy controls. The distribution of IL-10 gene haplotypes was also similar between both patient groups and normal controls. These results suggest that IL-10 gene promoter region polymorphisms are not associated with genetic susceptibility to type 1 diabetes and AITD.

Association of interleukin-18 gene promoter polymorphisms in type 1 diabetes and autoimmune thyroid disease.

Type 1 diabetes is a heterogeneous autoimmune disease and is often associated with other organ-specific autoimmune diseases, including autoimmune thyroid disease (AITD). IL-18 is a potent proinflammatory cytokine capable of inducing IFN-gamma production that is associated with the development of type 1 diabetes and AITD. The gene for IL-18 is located near Idd2 and has been reported to be associated with a susceptibility to type 1 diabetes. To test the putative involvement of IL-18 gene polymorphism in predisposition to type 1 diabetes and AITD, we conducted a case-control study in Japanese population. The SNPs at position -607 (C/A) and -137 (G/C) in the promoter region of the IL-18 gene were analyzed by sequence-specific PCR in 74 nondiabetic patients with AITD, 47 type 1 diabetic patients with AITD, and 114 normal controls. There was no significant increase in the genotype and allele frequencies not only in nondiabetic patients with AITD compared with normal controls, but also in type 1 diabetic patients with AITD compared with normal controls. The distribution of IL-18 gene haplotypes was also similar between both patient groups and normal controls. These results suggest that polymorphisms of the IL-18 gene are not associated with a susceptibility to AITD and type 1 diabetes coexistent with AITD in Japanese population.

Epitope analysis of GAD65 autoantibodies in Japanese patients with autoimmune diabetes.

Type 1 diabetes is an organ-specific autoimmune disease characterized by T cell-mediated destruction of pancreatic beta cells. In Japanese population, the incidence of type 1 diabetes in children is very low compared to European countries. However, there are more patients with type 1 diabetes in adults, including latent autoimmune diabetes in adults (LADA). The circulating autoantibodies to multiple islet autoantigens including GAD, insulin, and IA-2 are the important immunological features of type 1 diabetes. The prevalences of anti-islet autoantibodies in patients with Japanese type 1 diabetes are 60-70% for GAD autoantibodies, 45-50% for insulin autoantibodies (IAA), and 60-65% for IA-2 autoantibodies at disease onset, which are similar to those reported in Caucasian patients. With combinatorial analysis of these autoantibodies, 90% of patients express at least one of these autoantibodies and are classified as type 1A diabetes. Although the majority of patients with type 1 diabetes are young, lean, and ketosis-prone, there are a number of patients with type 1 diabetes initially diagnosed as having type 2 diabetes at disease onset called LADA. These patients with LADA often progress toward an insulin-deficient state within several years after diagnosis. High levels of GAD autoantibodies have a high predictive value for future insulin deficiency in LADA. Further, epitope analysis of GAD65 autoantibodies may be helpful to predict future insulin dependency in LADA patients. In conclusion, Japanese patients with type 1 diabetes are clinically heterogeneous and the determination of immunological features are helpful to clarify the characteristics of the Japanese type 1 diabetic syndrome.

Stromal-cell derived factor-1 chemokine gene variant is associated with type 1 diabetes age at onset in Japanese population.

Stromal-cell derived factor-1 (SDF-1) is a powerful chemokine that upregulates T-cell migration and activation. The gene for SDF-1 is located near type 1 diabetes susceptibility locus IDDM10, suggesting a contribution by SDF-1 to the induction of diabetes. Recently the role of SDF-1 gene polymorphism in the clinical presentation of type 1 diabetes in French population has been reported. To test the putative involvement of SDF-1 gene polymorphism in predisposition to or clinical heterogeneity of type 1 diabetes in Japanese population, we conducted the case-control study. The SDF1-3'A variant (801 G to A in the 3'-untranslated region) was determined by the polymerase chain reaction-restriction fragment length polymorphism technique in 184 patients with abrupt-onset type 1 diabetes and 106 healthy control subjects. No significant difference in allele and genotype frequencies of SDF1-3'A variant was found between type 1 diabetic patients and healthy controls. However, the SDF1-3'A variant was strongly associated with early-onset diabetes in a recessive model (AA versus AG + GG, p = 0.017). The mean age-at-onset in patients carrying SDF1-3'AA genotype was significantly younger than that in patients with SDF1-3' AG or GG genotype (p = 0.028). The frequencies of SDF1-3' A variant were significantly increased in HLA-DR4/9 patients compared with non-DR4/9 patients (p = 0.008). These results suggest that the SDF-1 gene polymorphism is associated with the age-at-onset of type 1 diabetes in Japanese population.

Apoptosis in normal rat embryo tissues during early organogenesis: the possible involvement of Bax and Bcl-2.

Apoptosis commonly occurs in a variety of developmental processes in mammals. In this study, we investigated the relationship between apoptosis and the expression of both Bax and Bcl-2 during the early organogenesis period (9.5-11.5 days of gestation) of rat embryos. Apoptotic cells detected by the terminal deoxynucleotidyl transferase-mediated nick-end labeling (TUNEL) method were extremely abundant in the foregut diverticulum at 9.5 days of gestation, while they largely disappeared at 10.5 and 11.5 days of gestation, although they were detected in newly formed mid- and hindgut diverticulum at these times. Real-time RT-PCR analysis of whole embryos revealed that the expression of bax mRNA was constant at days 9.5 to 11.5, while the expression of bcl-2 mRNA gradually increased. Immunohistochemical studies of Bax and Bcl-2 expression revealed that these apoptotic cells were exactly positive to Bax in mirror sections, while their expression of Bcl-2 was generally too low to be detected. A disappearance of apoptotic cells was associated with strong Bcl-2 expression in the foregut diverticulum at 10.5 and 11.5 days of gestation. It was similarly observed that apoptotic cells detected in the cardiogenic area at 9.5 days of gestation disappeared with the formation of the primitive heart tube--accompanied by a strong expression of both Bcl-2 and Bax--in the developmental process of the primitive heart. Apoptotic cells were also observed in the primitive brain vesicle, optic vesicle, otic vesicle, and thyroid primordium at 10.5 and 11.5 days of gestation during the developmental process, with a strong expression of Bax. These results indicate that the Bax and Bcl-2 may be important in regulating the induction of embryonic cell apoptosis during early organogenesis.

Genetic association between interleukin-10 gene promoter region polymorphisms and type 1 diabetes age-at-onset.

This study investigated whether interleukin-10 (IL-10) gene promoter region polymorphisms are associated with susceptibility to or clinical presentation of type 1 diabetes. The frequency of -1082G/A, -819C/T, and -592C/A polymorphisms was analyzed in 128 Japanese patients with type 1 diabetes and in 107 healthy control subjects in a case-controlled study. The allelic and haplotypic frequencies of the IL-10 gene promoter region polymorphisms were similar in patients with type 1 diabetes and in control subjects. However, the -819T and -592A allele were associated with adult-onset (>18 years) of the disease (p = 0.037). Furthermore, the frequency of ATA haplotype was increased in adult-onset patients than that in early-onset patients (< or =18 years; p = 0.037). Among the genotypes comprising ATA haplotype, the frequency of ATA/ATA was significantly higher in adult-onset patients than in early-onset patients (p = 0.004). These results suggest that the IL-10 gene promoter polymorphisms are associated with the age-at-onset in Japanese patients with type 1 diabetes.