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71.
Kaska Y Ilgaz C Ozdemir A Başkale E Türkozan O Baran I Stachowitsch M 《Die Naturwissenschaften》2006,93(7):338-343
Hatchling sex ratios in the loggerhead turtle (Caretta caretta) were estimated by placing electronic temperature recorders in 21 nests at Fethiye beach during 2000–2002. Over the seasons, the mean temperature in the middle third of the incubation period ranged from 26.7 to 32.1°C, and incubation periods ranged from 49 to 67 days. Based on the mean temperatures during the middle third of the incubation period, and on histologically sexed dead hatchlings, the sex ratios of hatchlings at Fethiye beach were roughly equal, i.e. 60–65% of the hatchlings were females. This contrasts with the highly female-skewed sex ratios in loggerhead turtles elsewhere; Fethiye has a relatively high proportion of male hatchlings. For endangered sea turtles, the knowledge of hatchling sex ratios at different beaches, coupled with appropriate conservation measures, can make an important contribution to their survival. 相似文献
72.
Different sources of pollution in Karasu Creek were investigated to obtain the water quality and ratio of contamination in
this region. To achieve the main objectives of the present study, water samples were collected from Karasu Creek, starting
from flow pattern at the upstream site of Akkaya Dam to the end of the dam, crossing the place where the Creek drains into.
Dissolved oxygen, electrical conductivity, temperature and maximum/minimum pH were measured systematically for 12 months in
the stations, where the water samples were collected. Chemical analyses of the water samples were carried out by using Cadas
50 S brand UV spectrometer to find out the Pb, Fe, Cu, Zn, Ni, Cr, Cd, S, F and Cn concentrations. These concentration were
determined in μg/lt as 80–850; 180–4,920; 10–6,100; 440–25,530; 130–2,400; 120–280; 20–150; 214,250–1,113,580; 1,560–4,270
and 40–690, respectively. To determine metal levels of the water samples, multivariate analyses (element coefficient correlation,
coefficient correlation dendrogram, hierarchical cluster analysis dendrogram, model summary and ANOVA) were used. The analyses
yielded highly accurate results. There were positive correlations between some elements and their possible sources were the
same. The stations which resembled each other along the creek were divided into three groups. The water quality of the creek
was low and had toxic qualities. Eutrophication developed in Akkaya Dam along the creek. The source of pollution was thought
to be industrial and residential wastes. Absolute (0–100 m), short distance (100–500 m) and medium distance (500–2,000 m)
conservation areas should be determined in pollution areas along Karasu Creek and they should be improved. 相似文献
73.
Ahmet Hızal Ferhat Gökbulak Mustafa Zengin Mehmet Ercan Ahmet Karakaş Dilek Tuğrul 《Environmental monitoring and assessment》2013,185(12):10249-10256
The objective of this study was to examine the effects of vegetation change from a native broadleaf forest to a coniferous plantation on selected soil properties, including soil texture, pH, organic matter, total nitrogen (N), total phosphorus (P), exchangeable cations (Ca2+, K+, Na+), and cation exchange capacity (CEC). Results showed that the amount of clay particles, Ca2+, and K+ values significantly increased, whereas Na+, total N, and organic matter and soil pH values decreased on the treatment plot after vegetation change. Soil acidity also increased and soil textural group changed from moderately fine-textured soils (clay loam) to medium-textured soils (loam) under both control and treatment plots. Organic matter, total N, and Na+ values increased, whereas Ca2+ concentration decreased through time on the control plot. Soil pH, total P, K+, and CEC did not show significant changes through time on the control plot. 相似文献
74.
75.
Many kinds of cosmetic products were analyzed to determine gross radioactivity. In this study, gross alpha/beta radioactivity concentrations in 51 cosmetic samples were determined. The examined cosmetic products consist of blusher, eye shadow, lipstick, nail polish, shampoo, hand cream, cellulite cream, baby powder, soap, and toothpaste. The gross alpha–beta activity concentrations were measured with a nuclear spectroscopic system which contains gas-flow proportional counters. The highest gross alpha/beta activity concentrations were found in eye shadow samples of 1.621Bq g?1 for alpha and 6.471Bq g?1 for beta. The total effective doses due to gross radioactivity for skin were calculated. Although the effective dose of eye shadow samples had the highest value, the effective doses due to gross radioactivity concentrations in this study were found to be lower than the radiological limits given by the authorities. 相似文献
76.
Gülden Z. Omurtag Duygu Yazicioğlu 《Journal of environmental science and health. Part. B》2013,48(6):797-807
Abstract The purpose of this study was to investigate the T‐2 toxin contaminated grain and grain products consumed especially by Turkish population. The T‐2 toxin was detected using the high performance liquid chromatography (HPLC) with UV detector at 208 nm and the identify of T‐2 was further confirmed by thin layer chromatography (TLC). The recovery was 91 ±4.24% for corn flour fortified with the known amount of T‐2 toxin (1 ppm). The detection limits of T‐2 toxin for the HPLC and the TLC were 25 ng and 50 ng, respectively. A total of 30 commercially available grain and grain product samples were analyzed. Two corn flour samples were found to contain detectable levels of T‐2 toxin at a level of 1.60 ppm and 4.08 ppm. 相似文献
77.
Data on the short-term effects of fumigation with hydrogen fluoride (HF) on the response behavior of the Nicotiana tabacum L. cv. St. Karabalar 6265 are being presented. Growth rate, fluoride accumulation in leaves and soils, and degradation in chlorophyll and nicotine contents of the plant species against the variations in two experimental factors, namely the exposure concentration and exposure time parameters, were investigated. Resulting data reveals that the variety selected for this study is not so tolerant to fluoride as generally reported in the literature, if only the individual effects of the pollutant is considered. 相似文献
78.
Mertoğlu-Elmas G 《Journal of environmental biology / Academy of Environmental Biology, India》2003,24(4):489-492
Cell-wall components and solubility characteristics of the heartwood and sapwood of Taxus baccata L. were determined by methods of wood analysis and the differences between heartwood and sapwood were established. When we observe the data obtained, it is seen that the amount of extractive material found in the heartwood is substantially higher than the sapwood. The extractive material in Taxus baccata L. is originated from the hidden epithelial cells surrounded by resin canals. 相似文献
79.
耗散结构理论在矿井通风系统优化中的应用 总被引:2,自引:0,他引:2
利用耗散结构理论,以系统的影响参数作为切入点,对矿井通风系统的形成过程、系统平衡等进行描述,据此得出了一些探讨性结沦,这些有助于矿井通风系统优化与控制的计算机模拟。 相似文献
80.
Nahit Aktaş Nurettin Şahiner Ömer Kantoğlu Bekir Salih Abdurrahman Tanyolaç 《Journal of Polymers and the Environment》2003,11(3):123-128
Enzymatic polymerization of catechol was conducted batch-wise using laccase enzyme produced by the culture Trametes versicolor (ATCC 200801). The polymerization reaction was carried out in 1:1 (v/v) aqueous-acetone solution, buffered at pH 5.0 with sodium acetate (50 mM) in a sealed, temperature-controlled reactor at 25°C. The molecular weight of the produced polymer was determined with GPC. FT-IR, DSC, and TGA were employed to investigate the structure and thermal behavior of synthesized poly(catechol). It was found that catechol units were linked together with ether bonds and thermal stability of the catechol increased in the poly(catechol) polymeric structure effectively. The number average molecular weight of poly(catechol) was found as 813 ± 3 Da with a very narrow polydispersity value of 1.17 showing selective polymerization of catechol by the enzyme. 相似文献