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1.
Zhongguo Dang Dai Er Ke Za Zhi ; 25(11): 1143-1149, 2023 Nov 15.
Artigo em Zh | MEDLINE | ID: mdl-37990459

RESUMO

OBJECTIVES: To investigate the changes in the serum levels of Klotho, fibroblast growth factor 23 (FGF23), and insulin-like growth factor-1 (IGF-1) in children with idiopathic short stature (ISS) before and after recombinant human growth hormone (rhGH) treatment, as well as the correlation of Klotho and FGF23 with the growth hormone (GH)/IGF-1 growth axis in these children. METHODS: A prospective study was conducted on 33 children who were diagnosed with ISS in the Department of Pediatrics, Hebei Provincial People's Hospital, from March 10, 2021 to December 1, 2022 (ISS group). Twenty-nine healthy children, matched for age and sex, who attended the Department of Child Healthcare during the same period, were enrolled as the healthy control group. The children in the ISS group were treated with rhGH, and the serum levels of Klotho, FGF23, and IGF-1 were measured before treatment and after 3, 6, and 9 months of treatment. A correlation analysis was conducted on these indexes. RESULTS: There were no significant differences in the serum levels of IGF-1, Klotho, and FGF23 between the ISS and healthy control groups (P>0.05). The serum levels of Klotho, FGF23, and IGF-1 increased significantly in the ISS group after 3, 6, and 9 months of rhGH treatment (P<0.05). In the ISS group, Klotho and FGF23 levels were positively correlated with the phosphate level before treatment (P<0.05). Before treatment and after 3, 6, and 9 months of rhGH treatment, the Klotho level was positively correlated with the IGF-1 level (P<0.05), the FGF23 level was positively correlated with the IGF-1 level (P<0.05), and the Klotho level was positively correlated with the FGF23 level (P<0.05), while Klotho and FGF23 levels were not correlated with the height standard deviation of point (P>0.05). CONCLUSIONS: The rhGH treatment can upregulate the levels of Klotho, FGF23, and IGF-1 and realize the catch-up growth in children with ISS. Klotho and FGF23 may not directly promote the linear growth of children with ISS, but may have indirect effects through the pathways such as IGF-1 and phosphate metabolism. The consistent changes in Klotho, FGF23 and IGF-1 levels show that there is a synergistic relationship among them in regulating the linear growth of ISS children.


Assuntos
Hormônio do Crescimento Humano , Criança , Humanos , Hormônio do Crescimento Humano/uso terapêutico , Hormônio do Crescimento Humano/farmacologia , Fator de Crescimento Insulin-Like I/análise , Fator de Crescimento Insulin-Like I/metabolismo , Fator de Crescimento Insulin-Like I/farmacologia , Fator de Crescimento de Fibroblastos 23 , Estudos Prospectivos , Transtornos do Crescimento , Fosfatos/farmacologia , Estatura
2.
J Interv Cardiol ; 2021: 3900269, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34987315

RESUMO

BACKGROUND: Ventricular septal rupture (VSR) is a severe mechanical complication secondary to acute myocardial infarction (AMI) with a dreadful prognosis. The goal of our study was to evaluate the mortality and to identify the predictors of mortality for this population. METHODS: From June 2012 to July 2021, patients with VSR secondary to AMI were initially screened for eligibility in this study. The potential risk predictors were determined using appropriate logistic regression models. RESULTS: In this retrospective study, a total of 50 cases were included, and 14 patients survived and got discharged successfully. Univariable analyses indicated that the heart rate (HR), white blood cell (WBC) count, neutrophils count, serum glucose, serum creatinine, serum lactic acid, and the closure of rupture were significantly associated with mortality among these special populations. CONCLUSION: This study found that such high mortality in patients with VSR after AMI was significantly correlated with these risk factors representing sympathetic excitation and large infarct size. Coronary revascularization combined with the closure of rupture might be helpful in improving their prognosis.


Assuntos
Infarto do Miocárdio , Ruptura do Septo Ventricular , Humanos , Infarto do Miocárdio/complicações , Prognóstico , Estudos Retrospectivos , Fatores de Risco , Ruptura do Septo Ventricular/diagnóstico por imagem , Ruptura do Septo Ventricular/etiologia , Ruptura do Septo Ventricular/cirurgia
3.
Eur J Med Res ; 29(1): 168, 2024 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-38475859

RESUMO

OBJECTIVE: To analyze the risk factors affecting psychiatric behavior and study the psychobehavioral conditions of children with epilepsy. METHOD: We randomly selected and enrolled 294 children with epilepsy who visited and were hospitalized in the pediatric clinic of Hebei General Hospital between January 2017 and January 2022, as the study participants. We comprehensively assessed their cognitive functions using the Gesell development schedule or Wechsler Intelligence Scales. The participants were divided into the study group (n = 123) with cognitive impairment and the control group (n = 171) with normal cognitive functions, for analysis. RESULTS: There were statistically significant differences between the two groups in disease course, frequency of epilepsy, status epilepticus, and the number of antiseizure medications (ASMs) used (P < 0.05), while there were no statistically significant differences in age, gender, age of onset, form of onset, interictal epileptiform discharge, history of febrile convulsion, and the time from onset to initial visit (P > 0.05). Based on multivariate logistic regression analysis, the course of disease, frequency of onset, status epilepticus and number of ASMs used were identified as high-risk factors for cognitive impairment in children with epilepsy. Similarly, early onset, long course of disease, known etiology, and combination of multiple drugs have a negative impact on behavioral problems, school education, and social adaptability. CONCLUSION: The course of disease, the frequency of onset, status epilepticus, and the number of ASMs used are high-risk factors for cognitive impairment in children with epilepsy, which can be prevented and controlled early. When selecting ASMs, their advantages and disadvantages should be weighed. Moreover, the availability of alternative treatment options must be considered. With the help of genomic technology, the causes of epilepsy should be identified as early as possible, and precision medicine and gene therapy for children with epilepsy should be actively developed.


Assuntos
Transtornos Cognitivos , Epilepsia , Estado Epiléptico , Criança , Humanos , Cognição , Transtornos Cognitivos/epidemiologia , Comorbidade , Epilepsia/tratamento farmacológico , Epilepsia/epidemiologia , Epilepsia/psicologia , Estado Epiléptico/complicações , Masculino , Feminino
4.
Acta Crystallogr Sect E Struct Rep Online ; 69(Pt 5): o758, 2013 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-23723904

RESUMO

In the title compound, C19H19BrO2, the cyclo-hexenone ring adopts an envelope conformation with the C atom bearing the methyl substituents as the flap. In the crystal, weak π-π stacking is observed between parallel aromatic rings of adjacent mol-ecules, the centroid-centroid distance being 3.694 (6) Å. The entire bromonaphthylmethyl unit is disordered over two orientations, with a site-occupancy ratio of 0.5214 (19):0.4786 (19).

5.
Med Eng Phys ; 112: 103952, 2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36842775

RESUMO

BACKGROUND: Some older patients who suffered from both conditions (disc degeneration and osteoporosis) have higher surgical risks and longer postoperative recovery times. Understanding the relation between disc degeneration and osteoporosis is fundamental to know the mechanisms of orthopedic disorders and improve clinical treatment. However, there is a lack of finite element (FE) studies to predict the combined effects of disc degeneration and osteoporosis. So the aim of the present study is to explore the differences of biomechanical effects of lumbar disc degeneration on normal patients and osteoporotic patients. METHODS: A normal lumbar spine finite element model (FEM) was developed based on the geometric information of a healthy male subject (age 35 years; height 178 cm; weight 65 kg). This normal lumbar spine FEM was modified to build three lumbar spine degeneration models simulating mild, moderate and severe grades of disc degeneration at the L4-L5 segment. Then the degenerative lumbar spine models for osteoporotic patients were constructed on the basis of the above-mentioned degeneration models. Firstly, the normal model (flexion: 8 Nm; extension: 6 Nm; lateral bending: 6 Nm; torsion: 4 Nm) and degenerative models (10 Nm) were calibrated under pure moment load, respectively. Secondly, under a 400 N follower load, the 7.5 Nm moments of different directions were applied on all models to simulate different motion postures. Finally, under the above loading conditions, we calculated and analyzed the range of motion (ROM), Mises stress in cortical (MSC1), Mises stress in endplate (MSE), Mises stress in cancellous (MSC2), and Mises stress in post (MSP). RESULTS: Compared with disc degeneration patients without osteoporosis, the ROM, MSC1, and MSE of osteoporosis patients with various disc degeneration decreased in all postures, while the MSC2 and MSP increased. With increase in the degree of disc degeneration, the reduction proportions of ROM and MSE in osteoporotic patients gradually increased, while the reduction percentages in MSC1 of osteoporotic patients gradually decreased. The increase percentages of MSC2 in osteoporotic patients gradually increased. Given the progressive changes of disc degeneration, the changes in MSP in osteoporosis patients were uneven. CONCLUSION: In summary, the effect of disc degeneration on flexibility in the two kinds of patients (osteoporosis and non-osteoporosis patients) was nearly same. By comparing the remaining biomechanical parameters (MSC1, MSE, MSC2, and MSP), we found that degenerated intervertebral discs caused changes in loading patterns of osteoporosis patients. Disc degeneration reduced the Mises stress in the cortical and endplate, which increased the Mises stress in the cancellous and post. That is to say, in order to cope with the changes in bone stresses caused by disc degeneration and osteoporosis, clinicians should be more careful in choosing the surgical option for osteoporotic patients with disc degeneration.


Assuntos
Degeneração do Disco Intervertebral , Disco Intervertebral , Osteoporose , Humanos , Masculino , Adulto , Degeneração do Disco Intervertebral/complicações , Degeneração do Disco Intervertebral/cirurgia , Análise de Elementos Finitos , Fenômenos Biomecânicos , Vértebras Lombares/cirurgia , Osteoporose/complicações , Amplitude de Movimento Articular
6.
Acta Crystallogr Sect E Struct Rep Online ; 68(Pt 3): o839, 2012 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-22412700

RESUMO

The title compound, C(12)H(13)ClN(2)O(2), crystallizes with two independent but very similar mol-ecules (A and B) in the asymmetric unit. The pyrazole ring in each mol-ecule has an envelope conformation. The dihedral angle between the pyrazole ring mean plane and the benzene ring is 86.07 (14)° in A and 85.99 (14)° in B. In the crystal, the A and B mol-ecules are linked via a pair of O-H⋯O hydrogen bonds, forming dimers. These dimers are further linked via C-H⋯O inter-actions to form -A-B-A-B- chains propagating along the c-axis direction.

7.
World J Clin Cases ; 10(6): 1795-1805, 2022 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-35317164

RESUMO

BACKGROUND: Intensive care unit (ICU) patients are critically ill and have low immunity. They will undergo various trauma medical procedures during diagnosis and treatment. The use of high-dose hormones and broad-spectrum antibiotics will increase the incidence of nosocomial infection in ICU patients. Therefore, it is necessary to explore the causes of nosocomial infection in ICU and provide basis for the prevention and control of nosocomial infection in ICU. AIM: To explore major pathogens of nosocomial infection in ICUs, methods of detection and drug resistance trends. METHODS: Risk factors of multidrug-resistant infection were analyzed to provide a basis for clinical rational use of antimicrobial drugs in the ICU. These findings were used to standardize rational use of antimicrobial agents. BD PhoenixTM100 automatic bacterial identification analyzer was used to for cell identification in specimens collected from the ICU between January 2016 and December 2019. Drug sensitivity tests were carried out and drug resistance trends were analyzed using the optical disc diffusion method. Odds ratios and corresponding 95%CI of independent variables were calculated using a logistic regression model. Backward elimination (trend = 0.1) was used as an inclusion criterion for multivariate analysis. All data were analyzed using SPSS version 22.0, and P < 0.05 was considered statistically significant. RESULTS: We collected 2070 samples from ICU patients between January 2016 and December 2019. Sample types comprised sputum (1139 strains, 55.02%), blood (521 strains, 25.17%), and drainage fluid (117 strains, 5.65%). A total of 1051 strains of major pathogens, including Acinetobacter baumannii, Escherichia coli (E. coli), Pseudomonas aeruginosa (P. aeruginosa), Klebsiella pneumoniae (K. pneumoniae) and Staphylococcus aureus, were detected, with a detection rate of 35.97% (378/1051). Most of these strains were resistant to antibiotics. Detection rate of E. coli was 21.79% (229/1051), and it was generally sensitive to many antimicrobial drugs. Detection rate of P. aeruginosa was 24.74% (260/1051), and showed low sensitivity to most antibiotics. Detection rate of K. pneumoniae was 9.42% (99/1051), which was generally resistant to multiple antimicrobial drugs and resistant forms. K. pneumoniae was resistant to imipenem for approximate 4 years, and showed a 19.9% (19/99) and 20.20% (20/99) rate of meropenem resistance. Logistic analysis showed that mechanical ventilation and ureteral intubation were risk factors for multidrug-resistant bacterial infections. CONCLUSION: This study showed a high incidence of ICU infections. Mechanical ventilation and urine tube intubation were risk factors for infection with multidrug-resistant bacteria.

8.
Acta Crystallogr Sect E Struct Rep Online ; 67(Pt 9): o2350, 2011 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-22058966

RESUMO

In the crystal structure of the title compound, C(8)H(6)N(2)O(3), the mol-ecules are linked by a pairs of inter-molecular N-H⋯O hydrogen bonds, forming inversion dimers. The aldehyde group is in the same plane as the pyrimidine ring [with a maximum deviation of 0.083 (2) Šfor the O atom), and the linear propargyl group [C-C-C = 178.99 (19)°] makes a dihedral angle of 74.36 (13)° with the ring.

9.
Acta Crystallogr Sect E Struct Rep Online ; 67(Pt 11): o2951-2, 2011 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-22219978

RESUMO

In the two independent but very similar mol-ecules (A and B) of the title compound, C(14)H(16)N(2)O(8), both six-membered pyrimidine rings are nearly planar [maximum deviations = 0.010 (3) Šin A and 0.028 (3) Šin B]. The five-membered furan-ose ring in mol-ecule A adopts an envelope conformation, while the same ring in mol-ecule B has a twisted conformation. In the crystal, the A mol-ecules are linked via a pair of inter-molecular N-H⋯O hydrogen bonds, forming dimers. Each A mol-ecule is further linked to a B mol-ecule via a second N-H⋯O hydrogen bond. There are also a number of C-H⋯·O inter-actions present, leading to the formation of a three-dimensional network.

10.
Front Pediatr ; 9: 659137, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34778120

RESUMO

Objective: To determine the risk factors of persistent pulmonary hypertension of the newborn using a meta-analysis method and provide a reference for its clinical prevention and treatment. Methods: A meta-analysis was performed by searching the PubMed, Embase, Cochrane Library, China Biology Medicine Disc, Wanfang, and Chinese VIP journal databases, as well as the China National Knowledge Infrastructure. Results: A total of 22 references were included in the meta-analysis; the cumulative medical records comprised 7,937 cases, and 2,613,072 control cases were included. A total of 12 related risk factors were included (7 were associated with pregnant women and 5 were associated with newborns). Conclusion: Among the 12 associated risk factors included, the three most important and their combined odds ratio values and 95% CI were as follows: (1) pregnant women smoking, 4.85 (1.98-11.9) during pregnancy; (2) gestational weeks <37, 4.34 (1.64-11.5); (3) perinatal asphyxia, 3.9 (2.87-5.31).

11.
Insect Sci ; 28(1): 77-92, 2021 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32039551

RESUMO

Swarming behavior facilitates pair formation, and therefore mating, in many eusocial termites. However, the physiological adjustments and morphological transformations of the flight muscles involved in flying and flightless insect forms are still unclear. Here, we found that the dispersal flight of the eusocial termite Reticulitermes chinensis Snyder led to a gradual decrease in adenosine triphosphate supply from oxidative phosphorylation, as well as a reduction in the activities of critical mitochondrial respiratory enzymes from preflight to dealation. Correspondingly, using three-dimensional reconstruction and transmission electron microscopy (TEM), the flight muscles were found to be gradually deteriorated during this process. In particular, two tergo-pleural muscles (IItpm5 and III-tpm5) necessary to adjust the rotation of wings for wing shedding behavior were present only in flying alates. These findings suggest that flight muscle systems vary in function and morphology to facilitate the swarming flight procedure, which sheds light on the important role of swarming in successful extension and fecundity of eusocial termites.


Assuntos
Voo Animal , Isópteros , Animais , Feminino , Isópteros/anatomia & histologia , Isópteros/química , Isópteros/fisiologia , Isópteros/ultraestrutura , Masculino , Microscopia Eletrônica de Transmissão , Músculos/anatomia & histologia , Músculos/química , Músculos/fisiologia , Músculos/ultraestrutura , Reprodução
12.
Front Public Health ; 9: 741083, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34858923

RESUMO

This study aimed to investigate the association between passive smoking and physical and psychological health in Chinese nurses. Participants of this cross-sectional study comprised 2,484 non-smoking nurses. Passive smoking and demographic information were assessed using a self-administered questionnaire. Physical, psychological, and overall health status of nurses were measured using the Cornell Medical Index (CMI) health questionnaire. Multivariate-adjusted odds ratio (OR) and 95% confidence interval (CI) for nurses' health were estimated by exposure to passive smoking using unconditional logistic regression models. A total of 1,219 nurses (49.07%) were exposed to passive smoking. Of these, 609 (24.52%), 160 (6.44%), and 587 (23.63%) nurses had poorer physical, mental, and overall health, respectively. After adjusting for other confounding factors, compared with the non-passive smoking group, passive smoking was associated with poor physical (OR = 1.51, 95% CI: 1.25-1.83), mental (OR = 1.48, 95% CI: 1.07-2.07), and overall (OR = 1.58, 95% CI: 1.30-1.93) health of nurses, respectively. We also carried out subgroup analyses stratified by age, department, and professional title, which showed that most findings supported the main results. This study demonstrated that exposure to passive smoking was a risk factor for overall decreased physical and mental health status among Chinese nurses.


Assuntos
Nível de Saúde , Enfermeiras e Enfermeiros , Poluição por Fumaça de Tabaco , China/epidemiologia , Estudos Transversais , Humanos , Inquéritos e Questionários
13.
Zhongguo Ying Yong Sheng Li Xue Za Zhi ; 36(3): 207-210, 2020 May.
Artigo em Zh | MEDLINE | ID: mdl-32981273

RESUMO

Objective: To observe the protective effects of exogenous spermine on renal fibrosis induced by diabetic nephropathy (DN) and to explore its mechanism.Methods: Twenty-four male C57 mice were randomly divided into control group, type 1 diabetes group (TID) and spermine pretreatment group (TID+Sp, n=8 in each group). TID mice were induced by STZ (60 mg/kg), and TID+Sp mice were pretreated with spermine (5 mg/(kg·d)) for 2 weeks before STZ injection. The mice were killed at the 12th week. The renal function was determined by serum creatinine and urea nitrogen. HE, PAS and Masson staining were used to evaluate renal tissue injury and fibrosis. The expressions of matrix metalloproteinase (MMP-2, MMP-9) and collagen IV (Coll-IV) in the kidney of mice were detected by Western blot. Results: Compared with the control group, the blood glucose (5.67±0.22 vs 28.40±0.57 mmol/L), creatinine (14.33±1.22 vs 30.67±4.73 µmol/L) and urea nitrogen (6.93±4.94 vs 22.00±1.04 mmol/L) in the T1D group were increased significantly (P<0.05), the glomerular basement membrane was thickened, the collagen was significantly increased, the expressions of MMP-2, MMP-9 and Coll-IV protein were increased (0.57±0.07 vs 1.06±0.20, 47.00±0.04 vs 1.29±0.09 and 0.42±0.16 vs 0.95±0.18,P<0.05). Exogenous spermine significantly alleviates the above-mentioned changes. Conclusion: Exogenous spermine pretreatment could significantly alleviate renal fibrosis in diabetic mice by regulating the balance between MMPs and collagen.


Assuntos
Diabetes Mellitus Experimental , Nefropatias Diabéticas , Espermina , Animais , Diabetes Mellitus Experimental/complicações , Diabetes Mellitus Experimental/tratamento farmacológico , Diabetes Mellitus Experimental/patologia , Nefropatias Diabéticas/complicações , Nefropatias Diabéticas/tratamento farmacológico , Nefropatias Diabéticas/patologia , Nefropatias Diabéticas/prevenção & controle , Fibrose/tratamento farmacológico , Regulação da Expressão Gênica/efeitos dos fármacos , Rim/patologia , Masculino , Camundongos , Distribuição Aleatória , Espermina/farmacologia , Espermina/uso terapêutico
14.
Zhongguo Ying Yong Sheng Li Xue Za Zhi ; 36(3): 193-196, 2020 May.
Artigo em Zh | MEDLINE | ID: mdl-32981270

RESUMO

Objective: To investigate the protective effect of spermine (Sp) on diabetic cardiomyopathy (DCM) and high glucose-induced cardiac fibroblasts (CFs), and to explore its mechanism.Methods: ①Animal experiments: 24 male Wistar rats were randomly divided into control group, type 1 diabetes group (TID) and spermine group (TID+Sp, each group n=8). TID rats were induced by streptozocin (STZ, 60 mg/kg), and TID+Sp rat were pretreated with spermine (Sp, 5 mg/(kg·d)) for 2 weeks before STZ injection. After 12 weeks of modeling, blood glucose, insulin levels, ejection fraction (EF) and shortening fraction (FS) were measured, and Masson staining and Sirius red staining were performed in the rat cardiac tissues. ②Cell experiments: primary CFs were extracted from newborn (1-3 d) Wistar rat hearts, and were randomly divided into control group, high-glucose group (HG) and HG+Sp group (n=6 per group). HG group was treated with 40 mmol/L glucose, and the HG+Sp group was pretreated with 5 µmol/L Sp for 30 min before HG treatment. The cell viability of CFs was detected by CCK8, the content of collagen in culture medium was analyzed by ELISA, and protein expressions of cell cycle related proteins (PCNA, CyclinD1 and P27) were detected by Western blot. Results: Compared with control group, the blood glucose and collagen content were increased, and the insulin level and heart function were decreased in the T1D group. Meanwhile, HG induced an increasing of the cell viability, the collagen content in the medium and the expressions of PCNA and CyclinD1, while the expression of P27 was down-regulated. Spermine could reduce the above changes, manifested as improving the cardiac function, regulating the expression of cyclin and reducing the level of myocardial fibrosis. Conclusion: Spermine can alleviate myocardial fibrosis in diabetic cardiomyopathy, which mechanism is related to the regulation of cell cycle.


Assuntos
Ciclo Celular , Complicações do Diabetes , Cardiomiopatias Diabéticas , Fibrose , Espermina , Animais , Glicemia/análise , Glicemia/efeitos dos fármacos , Ciclo Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Células Cultivadas , Complicações do Diabetes/induzido quimicamente , Complicações do Diabetes/tratamento farmacológico , Cardiomiopatias Diabéticas/induzido quimicamente , Cardiomiopatias Diabéticas/complicações , Cardiomiopatias Diabéticas/tratamento farmacológico , Fibroblastos/efeitos dos fármacos , Fibrose/tratamento farmacológico , Fibrose/etiologia , Glucose/toxicidade , Coração/efeitos dos fármacos , Masculino , Distribuição Aleatória , Ratos , Ratos Wistar , Espermina/farmacologia , Espermina/uso terapêutico
15.
Bull Environ Contam Toxicol ; 82(1): 31-8, 2009 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18841319

RESUMO

This study was conducted in Dachang, a small mining town in Gaungxi Zhuang Autonomous Region in southern China. A total of 23 farmland soil samples and two atmospheric samples of particulate matter less than 10 microns (PM(10)) were collected in this town. ICP-MS was used to analyze for 20 elements in each of the samples. All of the samples contained some level of heavy metals. The most commonly detected heavy metals detected in the soil samples were: Cd (up to 29.0 mg kg(-1)), As (up to 776 mg kg(-1)), Sb (up to 36.8 mg kg(-1)), Pb (up to 582 mg kg(-1)), Zn (up to 1379 mg kg(-1)) and Cu (up to 156 mg kg(-1)), Mn (up to 1476 mg kg(-1)). The PM(10) content in air samples exceeded the Chinese standard by nearly ten-fold. The most commonly detected heavy metals detected in the PM(10) atmospheric samples were Cd (up to 210 mg kg(-1)), As (up to 15239 mg.kg(-1)), Sb (up to 445 mg kg(-1)), Pb (up to 8053 mg kg(-1)), Zn (up to 13151 mg kg(-1)) and Cu (up to 673 mg kg(-1)), Mn (up to 2826 mg kg(-1)), Mo (up to 120 mg kg(-1)). All of these heavy metals are associated with significant human health effects ranging from reduced intelligent quotients (IQs) in children (cf. Pb) to cancer (e.g., Cd and As). Müller Geo-accumulation Index (Igeo) and enrichment factor (EF) were used to assess the findings. The results to the two assessments showed the same ranking: Cd > As > Sb > Pb > Zn > Cu > Mn, which would imply that the particulate matter in ambient air was the source of the contamination in the soil. The correlation analysis supported this inference. Upon further examination, ore transportation through the town was identified as the most likely source of contamination. Therefore, steps should be taken to improve the management of the ore transportation in order to protect the farmland and the health of the residents.


Assuntos
Altitude , Monitoramento Ambiental , Sedimentos Geológicos/análise , Metais Pesados/análise , Mineração , População Rural , Poluentes do Solo/análise , China , Material Particulado , Medição de Risco
16.
Acta Crystallogr Sect E Struct Rep Online ; 64(Pt 10): o1888, 2008 Sep 06.
Artigo em Inglês | MEDLINE | ID: mdl-21201100

RESUMO

In the title compound, C(21)H(16)N(4)O(2), the dihedral angle between the meth-oxy-substituted benzene ring and the ring system formed by the pyridinone ring and the pyrazole ring is 57.4 (1)°, and that between the unsubstituted phenyl ring and the ring system is 135.6 (1)°. In the crystal structure, mol-ecules are linked together via inter-molecular N-H⋯O hydrogen bonds.

17.
Acta Crystallogr Sect E Struct Rep Online ; 64(Pt 10): o1925, 2008 Sep 13.
Artigo em Inglês | MEDLINE | ID: mdl-21201133

RESUMO

In the structure of the title compound, C(20)H(15)BrN(4)O·C(2)H(6)O, the hydrogenated pyridinone ring adopts an envelope conformation. The dihedral angle between the bromo-substituted phenyl ring and the pyrazole ring is 79.6 (1)°, and that between the non-substituted phenyl ring and the pyrazole ring is 51.2 (1)°. In the crystal structure, mol-ecules are linked via inter-molecular N-H⋯O and O-H⋯N hydrogen bonds. A short inter-molecular N⋯Br contact [3.213 (4) Å] is present in the crystal structure.

18.
Acta Crystallogr Sect E Struct Rep Online ; 64(Pt 4): o689, 2008 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-21202081

RESUMO

The title compound, C(20)H(14)N(6)O(2), contains four rings. The dihedral angle between the pyridine ring and the pyrazole ring is 1.9 (1)°, i.e. almost coplanar, which gives rise to a conjugated structure. The dihedral angle between the nitro-substituted phenyl ring and the pyridine ring is 76.3 (1)° and that between the pyrazole ring and the non-substituted phenyl ring is 40.5 (1)°. In the crystal structure, symmetry-related mol-ecules are linked by N-H⋯O and C-H⋯N hydrogen bonds.

19.
Acta Crystallogr Sect E Struct Rep Online ; 64(Pt 5): o908, 2008 Apr 26.
Artigo em Inglês | MEDLINE | ID: mdl-21202390

RESUMO

In the crystal structure of the title compound, C(20)H(16)ClN(5), the dihedral angle between the pyrazole ring and the phenyl ring is 54.7 (1)° and that between the pyrazole ring and the chloro-substituted phenyl ring is 72.4 (1)°. The methyl H atoms are disordered over two positions with site occupancy factors of ca 0.7 and 0.3. One amino H is disordered equally over two positions. In the crystal structure, the mol-ecules are linked via inter-molecular N-H⋯N hydrogen bonding.

20.
Environ Pollut ; 231(Pt 1): 971-978, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28888941

RESUMO

This study consisted of a site- and age-specific investigation linking children's blood lead level (BLL) to environmental exposures in a historic mining site in south China. A total of 151 children, aged 3-7 years, were included in this study. The geometric mean (GM) BLL was 8.22 µg/dl, indicating an elevated BLL. The Integrated Exposure Uptake Bio-Kinetic (IEUBK) model has proven useful at many sites for study of routes of exposure. Application of the IEUBK model to these children indicated that the GM difference between observed and predicted BLL levels was only 1.07 µg/dl. It was found that the key environmental exposure pathway was soil/dust intake, which contributed 86.3% to the total risk. Younger children had higher BLL than did older children. Therefore, of the various low risk-high benefit solutions, interventions for the children living near the site should be focused on the dust removal and soil remediation. Implementation of the China Eco-village Construction Plan and China New Rural Reconstruction Movement of the government may be a better solution.


Assuntos
Exposição Ambiental/análise , Poluentes Ambientais/sangue , Chumbo/sangue , Mineração , Modelos Químicos , Criança , Pré-Escolar , China , Poeira/análise , Exposição Ambiental/estatística & dados numéricos , Feminino , Humanos , Cinética , Chumbo/análise , Masculino , Medição de Risco , População Rural , Solo
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