Most sectors are in the red today, but Nestor is leading healthcare equipment and services higher.The healthcare group admitted today it has rejected an unsolicited bid approach worth 90p a share in cash from the owners of the AA and Saga.The possible offer, which valued the business at £102m, was made by Acromas Holdings Limited, the parent company of the AA motoring association and over 50s insurer Saga.The software and computing services sector is lower as companies warn over the effects of tough economic conditions.Legacy software specialist Micro Focus has slashed its sales forecasts for this year after a sluggish first quarter and slow licence sales, though earnings guidance is unchanged.IT firm Triad said it continues to be affected by uncertainty in levels of client spending, particularly in the public sector.Top performing sectors so far todayGeneral Industrials 2,711.89 +1.83%Health Care Equipment & Services 3,224.19 +0.45%Alternative Energy 4,713.54 +0.21%Bottom performing sectors so far todayFixed Line Telecommunications 1,905.10 -4.39%Industrial Metals & Mining 5,868.32 -3.20%Software & Computer Services 620.92 -3.20%Technology Hardware & Equipment 493.18 -3.10%Industrial Transportation 2,287.18 -2.84%