in this study, the effect of some toxic organic chemicals on mogan lake has been investigatedusing the aquatox model. the unique property of the model includes the sub ecotoxicological modelwhen compared to the other water quality models. the ecosystem model aquatox, which is one of the fewgeneral ecological risk models that represents the combined environmental repercussions and effects of tox...

allow three different levels of carbon dioxide to be maintained, with identical plants grown in each section. Broecker said they are looking at conducting long-term experiments (perhaps decades-long) that emphasize perennial plants. They will look at factors such as the quality of fruits and nuts, as well as water-use efficiency. Many questions remain about what experiments to conduct, what pla...

We show that the default-all propagation scheme for database annotations is dangerous. Dangerous here means that it can propagate annotations to the query output which are semantically irrelevant to the query the user asked. This is the result of considering all relationally equivalent queries and returning the union of their where-provenance in an attempt to define a propagation scheme that is...

Tight glycaemic control (TGC) for patients treated in an intensive care unit ICU is associated with an increased risk for hypoglycaemia. Since hypoglycaemia mainly occurs in the sickest patients, no matter whether TGC is applied or not, it might be a marker for severity of illness or a harmful event in itself. Furthermore, it remains a matter of debate whether harmful effects of hypoglycaemia o...

The increased incidence of cutaneous malignant melanoma, together with only minor changes in mortality, has brought into question the existence of a melanoma epidemic. The discrepancy between incidence and mortality suggests that most newly diagnosed melanomas have indolent behaviour. This review summarizes the most recent epidemiological findings regarding the incidence of cutaneous malignant ...

www.sciencemag.org SCIENCE VOL 336 18 MAY 2012 765 COVER We are all too familiar with human confl ict, such as this bombing on 13 August 2006 in Beirut, Lebanon, by the Israel Defense Forces. In the special section on Human Confl ict (see page 818), we examine the origins of confl ict, trace its path through history, and consider its modern manifestations. We also analyze our innate ability to ...

The proposal that thiazide diuretics may increase cardiovascular risk receives no support from recent data. Current evidence does not indicate that diuretic-induced hypokalaemia is associated with increased ventricular arrhythmias. This evidence includes continuous electrocardiographic monitoring--which is the most sensitive technique for quantitating cardiac arrhythmias. In contrast to earlier...

Sir,—We should like to report disadvantages to the new style (laminated) cover of BJA. First, it is no longer possible to use the white band of the front cover for recording of progress, completed reading or pages/ references for storing. Second, we feel sure that we are not the only anaesthetists who have neither the space nor the time for journals at work and who receive journals at home. One...

W constitutes a dangerous equation? There are two obvious interpretations: Some equations are dangerous if you know them, and others arc dangerous if you do not. The first category may pose danger because the secrets within its bounds open doors behind which lies terrible peril. The obvious winner in this is Einstein's iconic equation e = nic~, for it provides a measure of the enormous energy h...

Options with discontinuous payoffs are generally traded above their theoretical Black–Scholes prices because of the hedging difficulties created by their large delta and gamma values. A theoretical method for pricing these options is to constrain the hedging portfolio and incorporate this constraint into the pricing by computing the smallest initial capital which permits superreplication of the...