Determination of P, Ca, Zn, Cd and Pb concentrations in muscle, gills, liver, gonads and skeletons of two natural populations of Atherina lagunae in North Tunis Lake, Tunisia

In this study, zinc (Zn), cadmium (Cd), lead (Pb), phosphorus (P) and calcium (Ca) concentrations in mus-cles, gills, liver, gonads and skeletons of two natural populations of sand smelt Atherina lagunae (Teleostean, Atherinidae) normal and deformed, as well as bioaccumulation of these elements from the water and the sediment in the North Tunis Lake were investigated. The analysis of Ca was performed with flame atomic absorption spectrometry. The average concentrations of Ca in the different tissues analyzed show higher val-ues in healthy atherines except in gonads where the average concentration of Ca in deformed atherines sig-nificantly exceeds that in normal atherines (p < 0.05) and the spine Ca concentrations were similar in the two populations. Zinc, cadmium, lead and phosphorus were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The Zn concentrations of Atherina lagunae in North Tunis Lake were very high compared to other studies in other lagoons. The highest concentrations were found in deformed atherines. The differences are significant for all tissues studied (p < 0.05). The average concentration of P in different tissues analyzed shows that the highest values were detected in the normal population of Atherina lagunae. The potential rate of Cd was below the detection limit in the different organs analyzed, in water and sediment.

Reproduction of <i>Atherina lagunae</i>from the Tunis North Lake

In this study, the reproduction of the sand smelt, Atherina lagunae, from the Tunis North Lake is investigated. The smallest mature female was 39 mm total length (TL). Fifty percent of the females were mature at 58 mm (TL). The yearly and monthly average gonadosomatic indexes (GSI) are presented. The average value of GSI for the 12-month period was respectively 3.02%, 2.57% and 2.8% for females, males and both sexes. The GSI began to increase in March (2.37% for females and 2.12% for males). The maximum GSI was recorded in May, 11.29% for females and 10.03% for males. The highest values were recorded between March and July, indicating the reproduction period of Atherina lagunae in the Tunis North Lake. Similar GSI values were recorded in sand smelt males from brackish lagoons of southern France.

Stand-Alone Photovoltaic System to Mitigate Pollution in Bodies of Water CASE Study: Laguna Del Carpintero, Tampico, Tamaulipas

One of the main environmental issues at present times is the pollution of hydrological resources. Water quality is a major factor to ecosystems, mostly those that support human health, food production and biodiversity. The utilization of renewable energy sources as solar energy through Photovoltaic Cells is a competitive and consolidated option to approach the solution of this kind of issues. This document is intended to introduce a prototype powered by photovoltaic cells to aerate a body of water and increase the amount of Dissolved Oxygen (DO) in water. The body of water studied is the lagoon Laguna del Carpintero in Tampico, Tamaulipas, Mexico. A Stand-alone Photovoltaic System (SPS) prototype was designed for this matter with the purpose of powering a pumping system to sprinkle water to the lake’s surface. This system is a way of ventilating the water so that it gets in direct contact with the surrounding atmosphere obtaining mean values compared to prevailing values of DO contained in the lagoon. We obtained DO concentration values going from 7 to 8 mg/L of O2 in different tests which can be considered an appropriate parameter for this body of water. The efficiency of the SPS was proved as it showed good performance by supplying power to the oxygenation system compared to the dimensional estimate. Improving the SPS prototype is the main goal of this work so that this oxygenation system could be used in other urban lagoons in the surrounding area without being powered by electrical grid. This makes possible to locate it at any point of the body of water to mitigate the pollution by increasing the amount of DO.

Environmental degradation through mining for energy resources:The case of the shrinking Laguna Santa Rosa wetland in the Atacama Region of Chile

As the world strives to replace fossil fuels with clean energy e reflected by global surge in the number of electric vehicles e the environmental impact of mining all the lithium(Li)needed to enable such a transformation has become a problem in its own right.In South America,the biggest problem is the excessive use of water in Li extraction process in one of the driest areas in the world.Apart from causing severe friction over water rights between local communities and mining companies,it puts enormous pressure on the region's fragile and poorly understood wetland ecosystems.Wetlands are one of the most threatened ecosystems on the Earth,despite their great importance as habitats for a vast number of species and corresponding to one of the most productive environments.Present work is the outcome of an investigation on Laguna Santa Rosa's(LSR)vulnerability resulting from ongoing metal mining operations in its surroundings that require a large volume of water extracted from local aquifers,in addition to a high evaporation rate in the area.This groundwater-dependent wetland will soon be further vulnerable with the commencement of water-intensive Li mining at Salar de Maricunga,with the extraction project already having an environmental impact study approved.Sustainability of this wetland protected under the Ramsar Convention and home to numerous wildlife species habiting this highland sector of the Andean Cordillera is vital for the associated ecosystems.The variation in the water surface area of LSR has been deciphered through the application of a Landsat-5 Thematic Mapper(TM)satellite image collection.This has been done both for the hydrological year 2016e2017 and 1993-2014 period.A decreasing trend in the water surface area of LSR,a hypersaline lake at the southern extreme of Salar de Maricunga,a salt flat in the Atacama Region of Chile,was observed through the study of satellite images between 1993 and 2014,showing shrinking of this wetland.However,this shrinking trend was punctuated by extreme rainfall and consequent flood with accumulated precipitation exceeding 40 mm in a single day and hourly mean rainfall rates higher than 10 mm/h recorded at several locations in the hyperarid Atacama Desert on March 25,2015.This raised the lake's water level,and thus the areal extent of the lake water observed in the satellite images of the 2016-2017 hydrological year following the extreme weather events of 2015.The interplay of such extreme weather events and groundwater extraction for mining activities in the area complicates the assessment of the latter's effect on LSR,as the evaluation is constrained to the intervals between successive extreme weather events.In addition,the water level increases in summer because of the thawing of the snow.Close monitoring of the wetlands like LSR is essential to ensure their sustainability by considering both anthropic and climatic factors.

全新雷诺Laguna轿车

2000年上半年,雷诺公司好事不断。雷诺和日产联合后正以持续的节奏发挥作用。4月,韩国三星并入雷诺集团,不仅使雷诺在1999年收购罗马尼亚达契亚公司后拥有了第三个品牌,而且为雷诺-日产在亚洲发展销售提供了新的机遇。7月,与沃尔沃公司签订协议,使雷诺持有世界第二大重型车制造商20％的股份。新的品牌形象和2002年重返F1赛场都将促进雷诺的国际化发展。

永远在路上Laguna——雷诺拉古那

雷诺新款拉古那集合了D级车型中几乎所有的优点,而远非老款车型的简单改良。新款拉古那的设计中特别注重视觉感受和内在品质,利用最新技术提高驾乘舒适感。第一代拉古那曾被尊为安全典范,而新款拉古那由于采用了最新的工艺和电子控制系统,更进一步巩固了其在欧洲安全霸主的地位。而坚固的底盘和灵活的悬挂系统则进一步提升了驾乘的乐趣。

稳健先行--雷诺LAGUNA Ⅱ

LAGUNA Ⅱ是一台十分注重安全和乘坐舒适性的轿车，性能表现并不是他的长项，安全和稳定才是LAGUNA所追求的。

变身 RENAULT New Laguna

2006年9月21日,晴。2．0km长直道,柏油路面。测试车已驶里程80km。我在大学时期就开过上一代的雷诺拉古娜,也许那时对于驾驶本身探究不多,因此它大胆前卫的外形便成了留给我的最深印象。时至今日,新拉古娜悄悄地走进我的视线,而现在。

Napier Grass Rumen Degradability in Sacco in Goats (<i>Capra hircus aegagrus</i>) Supplemented with Different Sources and Amount of Dietary Fats

The study aimed to explore the potential of dietary fats supplementation on the overall goat performance. Three (3) mature rumen-cannulated goats weighting 27.33 ± 1.53 kg housed in individual elevated metabolism stalls with customized fecal and urine collection tools with treatments replicated three times over time following the Complete Randomized Design (CRD). Animals were randomly selected on different dietary treatment at different cycle. For each cycle, animals were provided with 30% concentrate on the morning based on feed requirements {3% of their body weight (BW) dry matter (DM) basis} of the animals. Ad libitum feeding of Napier grass will follow thereafter. Clean drinking water were made available all the times in the respective animal watering troughs. The rumen-cannulated goats were supplemented with different levels of two dietary fats (VCO and Lard) with dietary treatment combinations as follows, Control and VCO and Lard at 3% & 5%. Degradability of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) were collected sequentially in every cycle of the study. There were seven (7) days lag period in every cycle for the animals to return to each natural state. On the 8th day of every cycle, animals were given different dietary treatment. Sequential insertion of nylon bag was done on the 15th to 16th day (7 days after treatment). The results showed that degradability of the dry matter (DM) was noticed degraded exponentially on the first twelve hours of incubation and slower down in the next few hours until 48 hours. Crude protein, acid and neutral detergent fiber showed breakdown of components was observed in the first 48 hours of incubation. No significant difference (P > 0.05) among treatment means was observed in all parameters gathered. This implies that mature female goat diet cannot be influenced by dietary fats from two different sources (VCO and Lard) at 3% to 5% supplementation. Based on the study conducted, dietary fats supplementation on goats such as VCO and lard given at the maximum level of 5% level did not influence the nutrient degradability of Napier grass in the rumen until it reaches at 48 hours of incubation. Supplementing ruminant diets with dietary fat in goats could increase the energy density of the animal’s diet without adverse effect on rumen degradability. This simple, easy, and basic technique could also be applied to other animal species in pursuit of finding ways to formulate indigenous feedstuff materials that have potential nutritive values. Given the limitations such as the climatic and environmental constraints, this particular study would somehow serve as benchmark in conducting related researches in optimizing the conditions with respect to animal nutrition and feedstuff utilization. Thus, this study was done to augment productivity and to provide new opportunities for achieving enhanced growth performance in a way that alleviates poverty, improves food security and nutrition and promotes sustainable use of natural resources.

品清湖避风塘选址的潮流计算与分析

根据野外观测资料建立起汕尾港品清湖的二维潮流数学模型。在IBM微机上对自然流态和湖内3种选址方案的流态进行了模拟计算。分析了湖内潮流运动,比较了3种选址方案对潮流的影响,提出了避风塘选址结果。

进口原油生产道路沥青可行性考察

对荣卡多、拉古娜、里昂纳、索鲁士四种进口原油进行了性质评价,并在实验室中考察四种原油生产沥青的可行性。结果表明,四种原油均能通过蒸馏法生产合格的道路沥青,其中荣卡多原油能够得到70号B级沥青、90号A级沥青;里昂纳原油可以生产50号B级沥青、70号A级沥青以及90号A级沥青;拉古娜原油可以生产50号A级、70号A级以及90号A级沥青;索鲁士原油可以生产90号A级沥青。

东山峰背斜寒武系地层中硼锂元素的指相意义

东山峰背斜寒武系地层分布区内，Ｂ，Ｌｉ元素的水系沉积物测量平均值分别为１７７．７８×１０－６、２２０．０×１０－６，衬值分别为２．３２、５．０７，Ｒｂ／ｋ比值为０．００６２。这些地球化学特征具典型的指相意义，反映出本区在早寒武世晚期至中、晚寒武世期间为一高盐度、强蒸发的泻湖相沉积环境，可与现代盐湖相环境类比。

哥们儿

它们都来自法国，又是同级别车型，同为2.0升排量，甚至都是两厢半掀背式车身，还用用同一款变速箱，关系实在是亲密。