aliu

Try this: <?php $input = 'UO2(CO3)'; $find = array('(', ')'); $input_clean = str_replace($find, "", $input); // replace '(' and ')' with nothing $letters = str_split($input_clean); $letter_counter = array(); $last_char = null; foreach ($letters as $char) { if (preg_match("/\d+/", $char)) { $letter_counter["$last_char"] = $letter_counter["$last_char"] + $char - 1; } else { $letter_counter["$char"]++; } $last_char = $char; } var_dump($letter_counter); ?> Quickly whipped it up but it works =) Allen Wow...just realized that I was a couple of months too late. Darn!

You cannot download during sleep mode in Windows 7. My suggestion is to change your power management mode to just turn off the screen rather than to go into sleep or hibernation mode. I hope this helps. Allen

It sounds like you are trying to do quantitative analysis for an ELISA analysis with a standard curve with 4 points to interpolate the concentrations of your unknown samples. If so, you will need to do a curve fit for your standard points. The most popular curve fit model to use for immunoassays is the 4 parameter logistic or 4PL which is a nonlinear regression model. MasterPlex ReaderFit is software specifically designed for ELISA/dose response quantitative analysis. If you can send me your absorbance values for your standards and unknowns (along with your standard concentrations), I would be more than happy to do a sample analysis for you. If you would like to try it for yourself, I would like to invite you to download the free 14-day fully functional trial of MasterPlex ReaderFit. Please feel free to ask me any questions you may have. * Disclaimer: I am an employee of Hitachi Solutions. Allen Liu Supervisor, Technical Support MiraiBio Group of Hitachi Solutions