Trace Elements Geochemistry of Soil-Plant System in Puxiong Lead-Zinc Mining Area, Yunnan, China

2013 ◽  
Vol 726-731 ◽  
pp. 239-244
Author(s):  
Juan Wang ◽  
Zheng Hai Wang
Keyword(s):  
Trace Elements ◽  
Correlation Coefficients ◽  
Mining Area ◽  
High Concentration ◽  
Transition Area ◽  
Lead Zinc ◽  
Measured Ratio ◽  
Concentration Factors ◽  
High Concentrations ◽  
The Relationship

This study aims to obtain an overview of trace elements concentrations in rocks, soils and plants from Puxiong lead-zinc mining area in Yunnan, China, and analyze the connection as well. Concentrations of Ba, Cd, Co, Cu, Mn, Pb, Zn, As, Sb, Hg, Sn, Ni and Sr among soils, rocks and three dominant plants in mining area, transition area and background were measured. Ratio parameter, bioconcentration factors (BF) and Pearson's correlation coefficients were used to analyze the relationship between these elements in different feature. The results indicate that rocks, soils and plants samples are all characterized by high concentrations of Pb, Zn and other associated elements in Puxiong lead-zinc mining area. Geochemistry of trace elements concentrations from rocks to soils, then to plants presents obvious characters of inheritance and variability. Whats more, three dominant plants are same in high concentration of Mn and low concentration of Cd, Hg, Co, but are huge different in bio-concentration factors.

Alteration in the myosin phosphorylation pattern of smooth muscle by phorbol ester

1990 ◽  
Vol 259 (5) ◽  
pp. C769-C774 ◽  
Author(s):  
M. Seto ◽  
Y. Sasaki ◽  
Y. Sasaki
Keyword(s):  
Steady State ◽  
Light Chain ◽  
Myosin Light Chain ◽  
High Concentration ◽  
Tension Development ◽  
Aortic Artery ◽  
Phosphorylation Pattern ◽  
Mlc20 Phosphorylation ◽  
High Concentrations ◽  
The Relationship

Pretreatment with a high concentration of phorbol 12-myristate 13-acetate (PMA, 100 nM) increased the degree of tension and extent of myosin light chain (MLC20) phosphorylation in the K(+)-stimulated rabbit aortic artery. Pretreatment with 100 nM PMA did not alter the relationship between MLC20 phosphorylation and the tension seen with K+ stimulation in the initial phase and steady state of contraction. However, a low concentration of PMA (10 nM) potentiated only the MLC20 phosphorylation during the steady state of contraction with no effect on the tension. In contrast, the prostaglandin (PG) F2 alpha-induced tension development and the MLC20 phosphorylation were not affected by PMA pretreatment at both low and high concentrations. The inhibitory action of nifedipine on the K(+)-induced contraction was not affected by pretreatment with 100 nM PMA; the concentration producing half-maximal inhibition of nifedipine for the K(+)-induced contraction (33 nM) was the same as that of the K+ plus 100 nM PMA-induced contraction (32 nM). Our results suggest that PMA may increase the level of myosin light chain kinase-dependent MLC20 phosphorylation and the tension in the K(+)-stimulated artery, an effect which differs from that seen with increases in K+ concentrations. The regulatory mechanism for the contraction involving PGF2 alpha stimulation may differ from that seen in the case of K+ stimulation.

scholarly journals Physico-chemical Characteristics and Heavymetal contents in Soil of South West EL-Fasher City,Western Sudan.

2021 ◽  
pp. 62-71
Author(s):  
Fatima Siddig Adam Abdel Wahed ◽  
Hatil Hashim EL-Kamali
Keyword(s):  
Soil Texture ◽  
Research Work ◽  
Correlation Coefficients ◽  
Physicochemical Characteristics ◽  
Heavy Elements ◽  
South West ◽  
Preventive Actions ◽  
Physico Chemical ◽  
High Concentrations ◽  
The Relationship

The objectives of this study were to assess levels of trace and heavy elements in South west EL-Fasher cityin North Darfur soils and to provide information regarding accumulation of these metalsin top and sub-soils and to determine the most important soil factors (chemical and physical) which influence trace and heavy elements concentrations in soil.Top and sub-soil samples were taken at various locations in South west EL-Fasher city. The soil characterization was carried out for parameters like pH, E.C, O.C, M.C, soil texture, and trace and heavy elements (Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb and Zn). The results obtained in this research work provides documentation of the relationship between physicochemical properties and heavy metals concentrations in soils of North Darfur. The pH was found to be slightly alkaline. The values of E.C indicated that all samples of the soils are non-saline. Fe, Mn, Cr, Zn and Cu were distributed in very high concentrations compared to other metals. This study will help the industrial section and can be benefit from it for commercial purposes.There were obvious differences in correlation coefficients among the selected criteria (65.6% from total number of correlated between pH and some other selected physicochemical characteristics, whereas 42.3% from the total number were positive correlated between soil texture and some other selected physicochemical characteristics. This study can serves as a database of trace and heavy elements build-up in soil, allowing preventive actions to be taken.

scholarly journals Effects of polyaluminum chloride (PAX-18) on the relationship between predatory fungi and Lecane rotifers

2021 ◽  
Author(s):  
Edyta Fiałkowska ◽  
Wojciech Fiałkowski ◽  
Christopher G. Wilson ◽  
Agnieszka Pajdak-Stós
Keyword(s):  
Wastewater Treatment Plants ◽  
High Concentration ◽  
Feeding Mode ◽  
Polyaluminum Chloride ◽  
Low Concentrations ◽  
Predacious Fungi ◽  
High Concentrations ◽  
And Control ◽  
The Relationship ◽  
Growth Of Fungi

AbstractPAX-18 (polyaluminum chloride) is frequently used in WWTPs (wastewater treatment plants) to overcome sludge bulking. An alternative biological method is the usage of Lecane rotifers, which can be endangered by predacious fungi. We investigated the influence of different PAX-18 concentrations on the relationship between Lecane inermis and predacious fungi (Zoophagus and Lecophagus) differing in feeding mode. High PAX concentration (6 mg Al3+ L−1) strongly limited the number of the rotifers, which in low concentration (1.2 mg Al3+ L−1), after an initial decline, increased, but significantly slower than in control. Under the simultaneous influence of Lecophagus and PAX, rotifers were driven almost extinct at the high concentration, but survived at the lower concentration and increased in the control. When treated with Zoophagus, only one or two rotifers survived in treatments and control. High concentrations of PAX significantly restricted the growth of fungi, whereas in low concentrations and control conditions, their length increased, with Zoophagus growing much quicker than Lecophagus. Zoophagus was significantly more efficient in trapping rotifers regardless of PAX concentration. The trapping ability of mycelium following extended exposure to PAX was strongly limited at high concentrations, in comparison to control. Conidia of Zoophagus turned out to be considerably more resistant to PAX-18 and starvation than Lecophagus conidia.

scholarly journals Monks and Icon Painters from the Spaso-Andronikov Monastery, Moscow

Radiocarbon ◽  
2009 ◽  
Vol 51 (2) ◽  
pp. 627-635
Author(s):  
E I Alexandrovskaya ◽  
A L Alexandrovskiy ◽  
J van der Plicht ◽  
N N Kovalyukh ◽  
V V Skripkin
Keyword(s):  
Trace Elements ◽  
Trace Element ◽  
Skeletal Remains ◽  
Element Concentrations ◽  
Human Bones ◽  
Lead Zinc ◽  
High Concentrations

In the Monastery of Our Saviour and St. Andronicus in Moscow, skeletal remains of clerics and of (possibly) famous icon painters were discovered. The bones were radiocarbon dated, and concentrations of trace elements in bone tissues were measured. From tombs 1–4, the 14C dates obtained from human bones (likely monks) and from associated wood date to the 14th–15th centuries AD, as expected. Trace element concentrations indicate signs of fasting. Tomb 5 contained 2 burials; these could belong to the famous icon painters Rublev and Chernyi. Indeed, the bones show high concentrations of lead, zinc, and copper, which is typical for remains of artists and metallurgists. The 14C dates of the 2 skeletons, however, differ by 200 yr, and seem to be too old for Rublev and Chernyi. At this stage, it is not clear if the burials can be assigned to these painters.

scholarly journals Exploratory analysis of trace elements in soils and plants affected by a gossan in the Semiarid

2021 ◽  
Vol 25 (2) ◽  
pp. 139-145
Author(s):  
César O. Arévalo-Hernández ◽  
Adailton L. Nascimento Junior ◽  
Arlicelio P. Queiroz ◽  
Eduardo Gross ◽  
Luciano da S. Souza
Keyword(s):  
Trace Elements ◽  
Local Community ◽  
Bioconcentration Factor ◽  
Cultivated Plants ◽  
Semiarid Region ◽  
Soil Conditions ◽  
High Concentration ◽  
The North ◽  
Zn Concentration ◽  
High Concentrations

ABSTRACT Trace elements in high concentrations are a huge problem worldwide. Monitoring of natural areas with a high concentration of these elements, such as soils under the influence of gossans, is important since there is little information available. This study aimed to evaluate the pseudo total and available concentrations of Fe, Mn, Pb, and Zn in the soil and its accumulation in native and cultivated plants in the area under the influence of gossan in the Semiarid region in Brazil. Soil samples (0-20 cm) were collected in the North, South, and center areas of the gossan and five transections separated by 1000 m. The pseudo total (EPA3050A) and available concentration (DTPA, Mehlich) of Fe, Mn, Pb, and Zn were determined. In the same points, plant samples were collected and processed to determine the concentration and bioconcentration factor of Fe, Mn, Pb, and Zn. Soils under the influence of the gossan had high Pb and Zn concentration (exceeding soil reference values), indicating that care should be taken in these areas to prevent any risk for the local community. Plants showed different accumulation patterns, with a higher accumulation of trace elements in the shoot (Fe, Mn, Zn), while Pb was primarily accumulated in the roots. Even though soil concentrations were high, plants showed in general, low bioconcentration factor of the potentially toxic elements, except for Zn, indicating that soil conditions limit their availability.

scholarly journals Trace Metals Distribution in Sulfide Minerals of the Ultramafic-Hosted Hydrothermal Systems: Example from the Kairei Vent Field, Central Indian Ridge

2018 ◽  
Author(s):  
Yejian Wang ◽  
Xiqiu Han ◽  
Sven Petersen ◽  
Matthias Frische ◽  
Zhongyan Qiu ◽  
...  
Keyword(s):  
Trace Elements ◽  
High Temperature ◽  
Trace Element ◽  
Sulfide Minerals ◽  
Hydrothermal Systems ◽  
Trace Element Distribution ◽  
High Concentration ◽  
Central Indian Ridge ◽  
Indian Ridge ◽  
High Concentrations

The ultramafic-hosted Kairei vent field, located at 25°19′S, 70°02′E towards the northern end of the segment 1 of the Central Indian Ridge (CIR-S1) in a water depth of ~2450 m. This study aims to investigate the distribution of trace elements among sulfides of differing textures, and discuss the possible factors controlling the trace element distribution in those minerals by using LA-ICP-MS spot analyses as well as line scans. Our results show that there are distinct systematic trace element distributions throughout the different minerals：(1) Pyrite is divided into three types at the Kairei, including early-stage euhedral pyrites (py-I), sub-euhedral pyrites (py-II), and colloform pyrites (py-III). Pyrite is generally enriched in Mo, Au, As, Tl, Mn, and U. py-I have higher contents of Se, Te, Bi, and Ni, py-II are enriched in Au relative to py-I and py-III, but poor in Ni, py-III are enriched in Mo, Pb, and U but are poor in Se, Te, Bi, and Au. Variations in the concentrations of Se, Te, and Bi in pyrite are likely governed by the strong temperature gradient. Ni is generally lower than Co in pyrites, indicates that our samples precipitated at a high-temperature condition, whereas the extreme Co enrichment is likely from a magmatic heat source combined serpentinization reactions underlie the deposits. (2) Chalcopyrite is characterized by high concentrations of Co, Se, Te. The abundant of Se and Te in chalcopyrite cause by the high solubilities of Se and Te incorporated into chalcopyrite lattice at high temperature fluids. The concentration of Sb, As and Au is relatively low in chalcopyrite from the Kairei vent field. (3) Sphalerite from both the Zn-rich chimney is characterized by high concentrations of Sn, Co, Ga, Ge, Ag, Pb, Sb, As, and Cd, but depleted in Se, Te, Bi, Mo, Au, Ni, Tl, Mn, Ba, V, and U in comparison with the other minerals. The high concentration of Cd and Co is likely caused by the substitution of Cd2+ and Co2+ for Zn2+ in sphalerite. A high concentration of Pb accompanied by high Ag concentration in sphalerite indicating the Ag occurs in the microinclusions of Pb-bearing minerals such as galena. Au is generally low in sphalerite and strong correlate with Pb suggesting its presence in the microinclusions of galena. The strong correlation of As with Ge in sphalerite from Kairei suggests that they might precipitate under medium- to low-temperature with moderately reduced conditions. (4) Bornite-digenite is very low in most trace elements, except for Co, Se, and Bi. The high concentration of Se and Bi in all the sulfide minerals was observed in bornite-digenite can be explained by abundant Bi-selenide inclusions. Serpentinization in ultramafic-hosted hydrothermal systems might play an important role on Au enrichment in pyrite with low As contents. Compared with felsic-hosted seafloor massive sulfide (SMS) deposits, sulfide minerals from the ultramafic-hosted deposits show higher concentrations of Se and Te, but lower As, Sb, and Au concentrations attributed to the contribution of magmatic volatile input. Significant Se enrichment in chalcopyrite has been found from mafic-hosted SMSs indicate that the primary factor that controls the Se enrichment is its temperature-controlled mobility in fluids.

Geochemical Features of Cherts of Yinchanggou Pb-Zn Orefield in Ningnan County, Sichuan Province, China

2013 ◽  
Vol 807-809 ◽  
pp. 2155-2158 ◽  
Author(s):  
Ying Shu Li ◽  
Yi Ke Zhang ◽  
Cheng Lin Yang ◽  
Jiao Jiao Chen ◽  
Dong Ming Yang ◽  
...  
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Mining Area ◽  
Major Elements ◽  
Sichuan Province ◽  
Light Rare Earth ◽  
Dengying Formation ◽  
Lead Zinc ◽  
Upper Sinian

In Yinchanggou lead-zinc mining area, Ningnan county, Sichuan province, there are many cherts in Dengying formation of upper Sinian series. By means of research on geological survey on field, petrology, major elements, trace elements and rare earth elements of the cherts, its proved that the cherts are chiefly composed of opal, jade and quartz, total amount of rare earth elements of the cherts for 1.36× 10-6, which is the light rare earth enrichment. For Fe/Ti is between 48.751and 194.44, (Fe+Mn)/Ti between 51.143 and 197.22, Al/(Al+Fe+Mn) between 0.03 per cent, the cherts is mainly formed by hydrothermal sedimentation.

Reliability of the Minimum Masking Level as Outcome Variable in Tinnitus Clinical Research

2020 ◽  
Vol 29 (3) ◽  
pp. 429-435
Author(s):  
Patricia C. Mancini ◽  
Richard S. Tyler ◽  
Hyung Jin Jun ◽  
Tang-Chuan Wang ◽  
Helena Ji ◽  
...  
Keyword(s):  
Standard Deviation ◽  
High Frequency ◽  
Pearson Correlation ◽  
Correlation Coefficients ◽  
Outcome Variable ◽  
Reliable Estimate ◽  
Moderate Correlation ◽  
Trained Subjects ◽  
The Relationship ◽  
Minimum Intensity

Purpose The minimum masking level (MML) is the minimum intensity of a stimulus required to just totally mask the tinnitus. Treatments aimed at reducing the tinnitus itself should attempt to measure the magnitude of the tinnitus. The objective of this study was to evaluate the reliability of the MML. Method Sample consisted of 59 tinnitus patients who reported stable tinnitus. We obtained MML measures on two visits, separated by about 2–3 weeks. We used two noise types: speech-shaped noise and high-frequency emphasis noise. We also investigated the relationship between the MML and tinnitus loudness estimates and the Tinnitus Handicap Questionnaire (THQ). Results There were differences across the different noise types. The within-session standard deviation averaged across subjects varied between 1.3 and 1.8 dB. Across the two sessions, the Pearson correlation coefficients, range was r = .84. There was a weak relationship between the dB SL MML and loudness, and between the MML and the THQ. A moderate correlation ( r = .44) was found between the THQ and loudness estimates. Conclusions We conclude that the dB SL MML can be a reliable estimate of tinnitus magnitude, with expected standard deviations in trained subjects of about 1.5 dB. It appears that the dB SL MML and loudness estimates are not closely related.

The Toxicity of Castor Beans and its Treatment with Doxycycline in Local Rabbits

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Nael Mohammed Sarheed ◽  
Osamah Faisal Kokas ◽  
Doaa Abd Alabas Muhammed Ridh
Keyword(s):  
Castor Bean ◽  
The Body ◽  
Control Group ◽  
High Concentration ◽  
Biochemical Tests ◽  
Doxycycline Treatment ◽  
High Concentrations ◽  
Physiological Tests ◽  
Animal House ◽  
Physiological And Biochemical

The plant of castor is widely spread in the Iraqi land, and characterized with containing ricin toxin, which has a very serious effects, and because the seeds of this plant scattered in the agricultural soil and rivers water, which increases the exposure of humans and animals to these beans. Objective: This experiment was designed to study the effect of high concentration of castor bean powder in some physiological and biochemical parameters and changes in some tissues of the body, as well as trying to use doxycycline to reduce the effects of ingestion of these seeds. Materials and Methods: In the experiment, 24 local rabbits were raised and fed in the Animal House of the Faculty of Medicine / Al-Muthanna University, then divided into four groups and treated for three weeks (21 days), Control group: treated with normal saline solution (0.9) orally throughout the experiment, G1: was treated orally with a concentration of 25 mg / kg of castor bean powder daily during the experiment, G2 : orally treated 25 mg / kg of castor bean and 25 mg / kg of doxycycline, G3: orally treated 25 mg / kg of castor powder with 50 mg / kg of doxycycline daily throughout the trial period. Results: The results of the experiment showed significant changes (P less than 0.05) in all physiological and biochemical blood tests when compared with control group. There was a significant decrease in PCV, Hb, RBC, T.protein and body weights, while demonstrated a significant increase in WBC, Urea, Creatinine, ALT, AST and ALP, with distortions in liver and kidney of animals that treated with Castor beans. In contrast, the treatment with doxycycline and caster beans showed significant improvement reflected by a normal proportion in physiological tests and biochemical tests with improvement in the tissues when compared to control group. Conclusions: It can be concluded from this study that castor bean has high toxic and pathogenic effects that may be dangerous to the life of the organism. Therefore, it is advisable to be cautious of these pills and avoid exposure to them, also recommended to take high concentrations of doxycycline treatment when infected with castor bean poisoning.

A Meta Analytic Review of the Relationship between Emotional Intelligence and Leadership Effectiveness

2019 ◽  
Vol 118 (9) ◽  
pp. 118-126
Author(s):  
Augusty P. A ◽  
Jain Mathew
Keyword(s):  
Systematic Review ◽  
Emotional Intelligence ◽  
Direct Relationship ◽  
Effective Leadership ◽  
Leadership Effectiveness ◽  
Meta Analysis ◽  
Correlation Coefficients ◽  
Review Of Literature ◽  
Analytic Review ◽  
The Relationship

The study evaluates the relationship between Emotional Intelligence and Leadership Effectiveness through a Systematic Review of Literature. The relationship has been evaluated in two steps. First, a Systematic review of literature was done to provide a theoretical framework to link the dimensions of Emotional Intelligence to the elements of effective leadership. Meta-analysis was then used to consolidate empirical evidence of the relationship. The studies for the meta-analysis were sourced from Pro Quest and EBSCO and the correlation coefficients of the studies were analysed. Only articles that presented the direct relationship between the variables were included in the study. The results of the analysis revealed a strong, statistically significant relationship between emotional intelligence and effective leadership. The findings of the study provide evidence for the proposition that Emotional Intelligence and Leadership Effectiveness are interrelated.

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