Statistical Modeling of Ambient Air Pollutants in Delhi     

Chelani  Asha B.  Gajghate  D. G.  Tamhane  S. M.  Hasan  M. Z. 《Water, air, and soil pollution》2001,132(3-4):315-331

State space model coupled with Kalman filter is used toforecast metal concentrations observed at Delhi. Three metalsviz. Lead, Iron, Zinc along with Respirable SuspendedParticulate Matter (RSPM) Concentration observed during 1993to 1995 are selected for the study. The data for year 1996is selected to test the forecasting ability of the model.Wind speed is used as an external input. Autoregressive modelwith external input is also used to compare the results. Itis found that the State space model is giving betterpredictions for lead, iron and RSPM concentration than theARX model while for zinc concentration, both the models aregiving good performance results.  相似文献   

Studies on the effect of ball milling on lignin structure using a modified DFRC method.     

Tsutomu Ikeda  Kevin Holtman  John F Kadla  Hou-min Chang  Hasan Jameel 《Journal of agricultural and food chemistry》2002,50(1):129-135

The structures of milled wood lignin (MWL), cellulolytic enzyme lignin (CEL), and residual lignin (REL) from a loblolly pine were analyzed using a modified derivatization followed by reductive cleavage (DFRC) method developed to allow the quantitative determination of three different structural monomeric products originating in lignin: phenolic beta-O-4, alpha-O-4, and etherified beta-O-4 structures. Results show that MWL and CEL are structurally identical, with an increased phenolic beta-O-4 content compared to that of the original Wiley milled wood. These results indicate that the portion of lignin linked to carbohydrates and that not linked to carbohydrates are structurally the same. Modified DFRC analysis of the effect of ball milling on the structure of lignin in wood, MWL, CEL, and REL indicate that vibratory ball milling does not change the lignin structure provided certain precautions are taken. Specifically, dry vibratory ball milling under a nitrogen atmosphere causes substantial structural changes including condensation, whereas vibratory ball milling in toluene had little effect on the lignin structure. This indicates that the structural differences observed in MWL and CEL arise because of the extraction procedure, which preferentially extracts phenolic lignin structures. MWL and CEL are representative of the total lignin in wood; however, due primarily to the solvent extraction process, higher phenolic hydroxyl contents are observed. Nitrobenzene oxidation showed structural results similar to those from the modified DFRC method.  相似文献   

The effect of vitamin E treatment on selected immune and oxidative parameters in Kivircik ewes suffering from transport stress     

Erdem Danyer  Tanay Bilal  Ayşen Altiner  İsmail Aytekin  Hasan Atalay 《Journal of animal physiology and animal nutrition》2021,105(Z1):34-41

The study aimed to investigate the effects of vitamin E injection for the prevention of transport stress on ewes. Kivircik ewes (2–3 years old, n = 24) were randomly separated into three groups; G1 (Control) and G2 treated with 14 ml. saline as the placebo, G3 treated with 2100 IU/ind. DL-alpha-tocopherol acetate prior to transport. G2 and G3 were transported at 80 km/h for 4 h on a truck. Serum samples were obtained before (T0) and after (T1) transport. Serum cortisol, catalase, IgG, ceruloplasmin, C-reactive protein, complement component 4, interleukin-1 beta, tumour necrosis factor-alpha, glutathione peroxidase (GPx), superoxide dismutase, malondialdehyde analyses performed by ELISA, and serum alpha-tocopherol concentrations were evaluated by HPLC-UV. Wilcoxon and Kruskal–Wallis tests were used for statistical assessments (p < 0.05). Alpha-tocopherol concentrations were founded 1.22 ± 0.82, 0.27 ± 0.14 and 0.14 ± 0.07 µmol/L, respectively, in G1, G2 and G3 at T1. Alpha-tocopherol concentration decreased significantly in G2 between T0 and T1. GPx concentrations were increased twofold in G2 and G3 between T0 and T1 (p < 0.01). As a result, G2 alpha-tocopherol concentrations decreased but, the stress and oxidative parameters tested in this study were not affected by treating 2100 IU/ind. DL-alpha-tocopherol acetate before transport.  相似文献   

番茄细菌性溃疡病研究进展   总被引：16，自引：0，他引：16  

罗来鑫  赵廷昌  李健强  张乐  李勇  Hasan BOLKAN 《中国农业科学》2004,37(8):1144-1144

 根据国内外近年来番茄溃疡病的研究概况,对番茄溃疡病的历史、主要症状、病原菌的分类地位及生物学特性、病原菌的分离、检测和鉴定技术、病害的田间发生、流行条件及防治方法进行了综述,分析了我国加入世界贸易组织后实施《卫生与植物卫生措施协定》以及农产品安全条例等,认为做好番茄溃疡病风险性分析、监测国际种子贸易传入该病害的可能性非常重要,同时提出了今后加强番茄溃疡病研究的主要方向。  相似文献   

Effect of embryo quality and developmental stages on pregnancy rate during fresh embryo transfer in beef heifers     

Erdem  Huseyin  Karasahin  Tahir  Alkan  Hasan  Dursun  Sukru  Satilmis  Fatma  Guler  Mehmet 《Tropical animal health and production》2020,52(5):2541-2547

Tropical Animal Health and Production - The objective of this study was to evaluate the effect of embryo quality and developmental stages on pregnancy rate in beef heifer recipients. The present...  相似文献   

Evaluation of the factors that affect the pregnancy rates during embryo transfer in beef heifers     

Hasan Alkan  Tahir Karaşahin  Şükrü Dursun  Fatma Satılmış  Hüseyin Erdem  Mehmet Güler 《Reproduction in domestic animals》2020,55(4):421-428

The aim of this study was to evaluate the effects of the transfer side, transfer location, cervix transfer score, type and diameter of corpus luteum (CL) during embryo transfer on pregnancy rates in beef heifers. Progesterone-based synchronization and superovulation protocol were applied to Simmental cows used as donors (n = 168). Uterine flushings were performed on day 7 following artificial insemination. Obtained Code I (excellent or good) and II (fair) quality embryos were transferred to recipient beef heifers (n = 561). During embryo transfer, side of transfer (right or left), transfer location (the cranial or middle third of uterine horn), cervix transfer score (easy, moderate or difficult) and type (CLa, CLb and CLc) and diameter of CL were determined. Pregnancy rates following the transfer of Code I and II embryos were 44.66% and 33.07%, respectively (p < .05). The rates of pregnancy after transfers to the right and left uterine horn were 37% and 42.2%, respectively (p > .05). The pregnancy rates were 41.2%, 34.9% and 30.3% for cervix transfer scores as easy, moderate and difficult, respectively (p > .05). Pregnancy rates after transfer to the cranial third and middle third were 41.06% and 29.67%, respectively (p < .05). According to types of CL, pregnancy rates were 31.7%, 40.4% and 45.3% for CLa, CLb and CLc, respectively (p < .05). Moreover, it was found that as the CL diameter increased, the pregnancy rates increased. As a result, it was concluded that there was no effect of side of transfer and cervix transfer score, but embryo quality, transfer location, type and diameter of CL had significant effects on the pregnancy rate during embryo transfer in beef heifers.  相似文献   

Brain evolution triggers increased diversification of electric fishes     

Carlson BA  Hasan SM  Hollmann M  Miller DB  Harmon LJ  Arnegard ME 《Science (New York, N.Y.)》2011,332(6029):583-586

Communication can contribute to the evolution of biodiversity by promoting speciation and reinforcing reproductive isolation between existing species. The evolution of species-specific signals depends on the ability of individuals to detect signal variation, which in turn relies on the capability of the brain to process signal information. Here, we show that evolutionary change in a region of the brain devoted to the analysis of communication signals in mormyrid electric fishes improved detection of subtle signal variation and resulted in enhanced rates of signal evolution and species diversification. These results show that neural innovations can drive the diversification of signals and promote speciation.  相似文献   

Topological phase transition and texture inversion in a tunable topological insulator     

Xu SY  Xia Y  Wray LA  Jia S  Meier F  Dil JH  Osterwalder J  Slomski B  Bansil A  Lin H  Cava RJ  Hasan MZ 《Science (New York, N.Y.)》2011,332(6029):560-564

The recently discovered three-dimensional or bulk topological insulators are expected to exhibit exotic quantum phenomena. It is believed that a trivial insulator can be twisted into a topological state by modulating the spin-orbit interaction or the crystal lattice, driving the system through a topological quantum phase transition. By directly measuring the topological quantum numbers and invariants, we report the observation of a phase transition in a tunable spin-orbit system, BiTl(S(1-δ)Se(δ))(2), in which the topological state formation is visualized. In the topological state, vortex-like polarization states are observed to exhibit three-dimensional vectorial textures, which collectively feature a chirality transition as the spin momentum-locked electrons on the surface go through the zero carrier density point. Such phase transition and texture inversion can be the physical basis for observing fractional charge (±e/2) and other fractional topological phenomena.  相似文献   

Evaluating and Modeling of the Seedling Growth Ability of Wheat Seeds as Affected by Shallow-Saline Groundwater Conditions     

Kiremit  Mehmet Sait  Arslan  Hakan  Sezer  İsmail  Akay  Hasan 《Gesunde Pflanzen》2022,74(2):357-369

The adverse effects of shallow-saline groundwater may vary among crucial growth stages of crops by decreasing crop growth and productivity. The present study aimed to assess the germination and seedling growth ability of wheat seeds grown in four different (0.38, 2.0, 4.0, and 8.0 dSm^?1) groundwater salinities (GWS) and three (30, 55, and 80?cm) groundwater depths (GWD) condition. To achieve this aim, wheat crops were grown in drainable lysimeters under rain shelter conditions until the maturity stage, and then wheat seeds were harvested from various saline groundwater conditions. Afterward, wheat seeds were germinated to identify the performance of germination and seedling growth attributes. Response surface methodology (RSM) was used to determine the optimal growing wheat seeds condition, which had high early seedling growth performance. The results showed that the seedling growth performance of wheat seeds increased with increasing GWDs, while decreased with increasing GWSs. Based on the RSM findings, we suggest that GWD and GWS should be at least 42?cm and at most 5.46 dSm^?1, respectively, for sustainable higher wheat yield and seed quality. Finally, this study could provide considerable information for selecting strong and healthy wheat seeds grown under shallow saline groundwater conditions.

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Genetic analysis of growth rate and Kleiber ratio in Zandi sheep     

Ghafouri-Kesbi F  Abbasi MA  Afraz F  Babaei M  Baneh H  Abdollahi Arpanahi R 《Tropical animal health and production》2011,43(6):1153-1159

Genetic parameters for average daily gain from birth to weaning (ADGa), birth to 6 months (ADGb), weaning to 6 months (ADGc), weaning to yearling age (ADGd), and corresponding Kleiber ratios (KRa, KRb, KRc, and KRd) were estimated by using records of 3,533 Zandi lambs, descendent of 163 sires and 1265 dams, born between 1991 and 2005 at the Zandi Sheep Breeding Station at Khojir National Park, Tehran, Iran. A derivative-free algorithm combined with a series of six single-trait linear animal models was used to estimate phenotypic variance and its direct, maternal, and residual components. In addition, bivariate analyses were done to estimate (co)variance components between traits. Estimates of direct heritability (h ² ) were 0.11, 0.15, 0.09, 0.10, 0.10, 0.10, 0.06, and 0.07 for ADGa, ADGb, ADGc, ADGd, KRa, KRb, KRc, and KRd, respectively, thereby indicating the presence of low additive genetic variation for growth rate and Kleiber ratio in this population of Zandi sheep. Maternal genetic component was found to be significant on ADGa and KRa and contributed 3% and 5%, respectively, in total phenotypic variance of ADGa and KRa. A widespread range of genetic correlations among traits studied was observed. Except for negative genetic correlations between ADGa and KRc, ADGa and KRd, and between KRa and KRc, in other cases, genetic correlations were positive and moderate to very high. Phenotypic correlations ranged from −0.49 (ADGa/KRd) to 0.94 (ADGc/KRc). These results indicate that selecting for improved growth rate or Kleiber ratio in Zandi sheep would generate a relatively slow genetic progress.  相似文献