Investigation of stock condition of Lengeh pearl oyster Pinctada radiata in western Hormozgan province habitats with emphasis on ecological agents

Pearling in Northern Persian Gulf has barred since 2006. Population dynamic and investigation of stock condition of pearl oysters has not done in thease area in thease years heretofore. For identification of habitats of Pinctada radiata, mohar oyster, primary sea tours in coastal waters of 11 regions in Lavan Island, 11 regions in hendorabi Island and 6 regions in Nakhiloo and Michaeil Ports, for early survey were done. 2 habitats in Lavan waters and 2 habitats in Hendorabi waters were identified and for investigation of stock condition, were sampled from autumn 2011 to summer 2012, seasonality. Belt transects andrandom quadrates method was used in this sampling. Physicochemical parameters in depth range of thease habitats was evaluated by CTD in first sea tour of stock sampling. Lavan 1 habitat, had maximum area, maximum total stock, maximum CPUA, maximum CPUE and maximum biomass, among other habitats, equal to 60ha, 357000N, 0.6N/m^2, 119N/hr and 4620kg respectively. Biometric data in Hendorabi2 habitat was rather than other habitats, significantly (P<0.01). Infinity length, L_∞, was calculated in Lavan1, Lavan2, Hendorabi1 and Hendorabi2 habitats, equal to 89.16, 87.68, 86.11 and 86.42 mm respectively. Growth constant, K, was estimated in Lavan1, Lavan2, Hendorabi1 and Hendorabi2 habitats, equal to 0.43, 0.44, 0.47 and 0.56 year^-1, respectively. Natural mortality constant, M, was calculated in Lavan1, Lavan2, Hendorabi1 and Hendorabi2 habitats, equal to 0.73, 0.75, 0.78 and 0.88 year^-1, respectively. Results of this project showed, area of investigated habitats, oysters stock of them and CPUA, have diminished in thease years, and interdict of pearl oysters catch was not able to revival of stocks. Majority of physicochemical parameters in depth ranges in surveyed habitas, had significant difference (P<0.01). Water turbidity in Hendorabi2 habitat was rather than other habitat, significantly (P<0.01), as subsidiary of high sedimentation in this habitat and main reason of high natural mortality constant, M, low settlement rate and absence of lower scale of oysters length in Hendorabi2 habitat

Notch effect and fracture load predictions of rock beams at different temperatures using the Theory of Critical Distances

ABSTRACT: This work aims to analyse the fracture behaviour of rocks with U-shaped notches subjected to mode I loading and to different temperature conditions. To this end, the so called Theory of Critical Distances (TCD) is applied and four different types of isotropic rocks are studied: a Floresta sandstone, a Moleano limestone, a Macael marble and a Carrara marble. This study attempts to extend a previous work of the authors where the TCD was successfully applied to U-notched components subjected to mode I loading conditions at room temperature. In this case, the effect of temperature is considered as a new variable. The research comprises, in total, more than 790 four-point bending tests and 144 tensile splitting (Brazilian) tests. The latter include 6 disc-shaped specimens for each rock and temperature (6 different temperatures), while the four-point bending tests consist of at least 6 SENB specimens for each rock, notch radius (8 different notch radii varying from 0.15 mm to 15 mm) and temperature (4 different temperatures) combination. The temperatures considered in this study vary from room temperature up to 250ºC, which is a common range in geothermal applications. Temperature has proven to be a significant parameter when analysing the fracture behaviour of the four selected rocks. Its influence on the tensile strength and fracture toughness of the rocks is clear and reveals common patterns. However, no apparent tendencies are shown on the influence of temperature on the critical distance (L). Likewise, the application of the TCD has led to relatively accurate fracture predictions and notch effect analyses at different temperature conditions.The authors of this work would like to express their gratitude to the Spanish Ministry of Economy and Competitiveness and to the European Regional Development Fund (ERDF) for financing the National Plan Project (Ref.: BIA2015-67479-R) under the name of “The Critical Distance in Rock Fracture”

Novel standards in the measurement of rat insulin granules combining electron microscopy, high-content image analysis and in silico modelling

Knowledge of number, size and content of insulin secretory granules is pivotal for understanding the physiology of pancreatic beta cells. Here we re-evaluated key structural features of rat beta cells, including insulin granule size, number and distribution as well as cell size

High resolution infrared spectroscopy of Van der Waals clusters of nitrous oxide and carbon dioxide

Bibliography: p. 186-193Weakly-bound van d r \i\ aal clu t r of 2 0 and C02 were studied in a pulsed supersonic slit expansion probed with a tunable diode la er. The first observation of a polar isomer of N 2 0 dim r in t h region of the v1 fundamental band wa mad . Structural parameter were determined by recording and analyzing the spectra of the 15 N- ubstituted isotopic form and h normal pecies. The polar form of the dimer has a lipped parallel t ructur, rather similar to the slipped antiparallel structure of the nonpolar form but wit h a slightly larger intermolecular distance. Litrature assignments of the combination band (rv2 249 cm- 1) involving the intermolecular torional vibration was corrected. In addition a higher frequency combination band involving the intermolecular disrotation of the monomers (Bu intermolecular bend) for both (14 2 0 )2 and (15 2 0 )2 were measured and analyzed. nitrous oxide trim r was also studied. A previous empirical structural culation on (14 2 0 )3 has suggested a noncy lie barrel-shaped structure; having no specific symmetry. In this structure, the t hr contiunt monomers are in equivalent giving n to the infrared band. We recorded and analyzed the three expected band for the 15 -substituted ioopic form and the normal pecie. Three weaker rim r combination bands were also observed. Each band involves the sum of one of the previously observed intramolecular trim r vibrations plus an intermolecular vibration (van der Waal str tch orb nd). Possible vibrational assignment forth combination band are discussed based on their rotational structure and t h ru ur of the trimer. W also carried out a number of new measurements on C0 2 cluster. Spectrum of the (12 C0 2 ) 2 in the v3 fundamental region has been previously studied showing a planar lipped-parallal structure with c ntrosymmetric C2h ymmetry. Here, we report our own analyses of t his band as well as analyses of t he spectra of t he (13 CO2 )2 and 12 CO2 - 13 CO2 , clarifying t he role of resonant and non-resonant vibrational shift . Moreover, observation of a combination band of the (12CO2 ) 2 provides the first experimental intermolecular vibrational frequency for the dimer. Possible vibrational assignments are discussed . Two new parallel bands of t he cyclic (12CO2)3 in the v3 fundamental region were also observed. This isomer of t he t rimer has been previously found to be a symmetric top with planar structure and C3h symmetry. The band were assigned as a combination of intramolecular CO2 monomer v3 stretch and intermolecular out-of-pl an torsion. This provides the first measurement of two intermolecular vibrational frequencies for the cyclic trimer

A Comparative Study of Photo-Degradation of Atrazine in Aquatic Environments Using UV and UV/Fe (III)-TiO2 Processes

A vast variety of pesticides are used for agricultural pests in Iran. The release of these persistent organic pollutants into water supplies leaves adverse effects on both the environment and public health. This study aimed to compare the photo-degradation of atrazine in the aquatic environment using UV and UV/Fe (III)-TiO2 processes. The effects of parameters including pH, the initial concentration of atrazine, and reaction time on the removal of atrazine in the aqueous phase using ultraviolet radiation (1020 μW/cm2) and UV/Fe (III)-TiO2 were investigated. Residual concentrations were determined using HPLC. Finally, the data were analyzed using SPSS software (version 16) and the graph was made by MATLAB software. The results demonstrated that the atrazine removal rate in both processes was significantly increased in acidic and alkaline conditions. By increasing initial atrazine concentrations, the removal rate was increased in both processes as well. Data showed that at the lower initial concentration of atrazine (0.1 and 1mg/l) the removal rate in UV/ Fe (III) - TiO2 process was more than the UV process. However, at higher concentration, both processes were almost the same and the maximum removal efficiency (99.2% at UV and 99.11% at UV /Fe (III) - TiO2) occurred at pH=11, initial Atrazine concentration of 10mg/L and the reaction time 30 min In conclusion, UV and Fe+3-TiO2/UV process was an appropriate method to reduce atrazine in contaminated water resources

Time-resolved spectroscopy of some transient molecules

Bibliography: p. 82-87We have developed a time-resolved gated-integration method where the growth or decay of the concentration of a given transient molecule in a hollow cathode discharge can be monitored. Two identical boxcars integrators provide two gates with predetermined widths, one monitoring end of discharge-off period (where no absorption takes place) and the other measuring at the absorption signal at a given delay time with respect to the discharge stop time. Then, by subtracting/dividing the two signals, the growth or decay of the concentration of the studied molecule is obtained. Decay of the concentration of C3 was found to be relatively long, on the order of millisecond. This decay was studied as a function of helium buffer gas pressure (10, 15 and 20 Torr). A linear dependency of the lifetime vs. buffer gas pressure was observed. Also, lifetimes of 24.5(1.5) ?s and 21 (1) ?s were measured for the two short-lived molecular ions H3 + and HN2 +, respectively

Effects of magnetic field on mental health staff employed in gas power plant, Shiraz, 2008

Background and aimsIn the industrial world, almost everyone is unavoidably exposed to ambient magnetic field (ELF) generated by various technical and household appliances. According to the studies carried out in a power station in Shiraz, psychological disorders causedby jobs are among the most important problems of the workers.MethodsThis study is performed to determine the presence or absence of psychological disorders. The General Health Questionnaire (GHQ) is used in this study to recognize psychosomatic disorders.ResultsMeasurements indicate that range of magnetic field varies from 0.087) micro Tesla(in the phone homes to 30)micro Tesla( in power stations. The results of this study has shown that a significant number of staff which were exposed to magnetic fields and noise )78.2%) were suspected to have a kind of mental disorders.ConclusionThe results obtained from this study which shows the prevalence of mental disorders among the suspected case is higher than the results of Noorbala and colleagues study in 2006. Therefore, there are necessities to do more research in order to find the relationship between electric and magnetic fields and psychological disorders

An Investigation of Shift Work Disorders in Security Personnel of 3 Hospitals of Shiraz University of Medical Sciences, 2009

Background and aims: Security personnel of hospitals in Iran are of shift worker groups that are affected more than of other shift workers. Methods: This study was performed in 3 hospitals of Shiraz University of Medical Sciences and 130 workers of security personnel were evaluated. Data of shift workers were collected with Survey of Shift workers (SOS) questionnaire and at the same time, the stature, weight and blood pressure were also measured. . Further , 130 people of unexposed group were evaluated by this questionnaire. Results: Comparison between two groups (shift workers and non-shift workers) has shown significant difference between the prevalence of high blood pressure, sleep disorders, satisfaction of individual life, satisfaction in family life, satisfaction in social life, psychological disorders, cardiovascular disorders, digestive disorders, musculoskeletal disorders in two groups and this significant difference in shift workers are more than of unexposed group. Conclusion: Investigation of these disorders has identified the importance of paying attention to shift workers requirements and contribution of workers in work schedules, problem solving and improvement of work conditions.

Spectroscopic identification of carbon dioxide clusters: (CO 2)6 to (CO2)13

In spite of wide interest in CO2 clusters, only dimers and trimers have previously been assigned to specific infrared bands. Here, transitions for clusters with 6-13 molecules are identified in the \u3bd3 region ( 3c2350 cm-1). Spectra are observed in a supersonic jet (T 3c 2.5 K) using a tunable laser probe, and analyzed with the aid of cluster calculations based on a widely-used model potential. Vibrational origins show blue-shifts significantly larger than predicted by resonant dipole interactions. \ua9 2011 the Owner Societies.Peer reviewed: YesNRC publication: Ye