Among the companies with shares expected to see active trading in Tuesday's session are Medtronic Inc., Computer Sciences and Toll Brothers Inc.

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Borders Group Inc. (BGP) is expected to report a first-quarter loss of 24 cents a share, according to analysts polled by Thomson First Call.

CBRL Group Inc. (CBRL) is seen posting a fiscal third-quarter profit of 50 cents a share.

Computer Sciences Corp.'s (CSC) fiscal fourth-quarter earnings are expected to be $1.13 a share.

Medtronic Inc. (MDT) is expected to report a per-share profit of 62 cents in its fiscal fourth quarter.

Palm Harbor Homes Inc. (PHHM) is seen posting earnings of 19 cents in its fiscal fourth quarter.

Phillips-Van Heusen Corp. (PVH) is expected to show earnings of 73 cents a share in its first quarter.

Toll Brothers Inc.'s (TOL) fiscal second-quarter results are expected to show a per-share profit of $1.03.

After Monday's closing bell, Quest Software Inc. (QSFT) said its board is forming a special committee to investigate the company's historical stock-option grant practices and related accounting.

Semtech Corp. (SMTC) said Monday evening it has received a letter from the Securities and Exchange Commission requesting information on stock options granted since Jan. 1, 1997. Semtech and Quest are like more than a dozen other companies, many in the technology sector, that have come under scrutiny for awarding option grants to executives on dates that appear to have maximized profits.

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Abaxis Inc. (ABAX) said the company and Henry Schein Inc. (HSIC) have agreed to discontinue their veterinary products distribution agreement effective immediately. Union City, Calif.-based Abaxis said Henry Schein's distribution accounted for 14% of Abaxis' total business in fiscal 2006.

Applied Signal Technology Inc. (APSG) reported fiscal second-quarter net earnings of $1.52 million, or 13 cents a share, down 35% from $2.33 million, or 20 cents a share, in the year-ago period. Revenue at the Sunnyvale, Calif.-based company rose 36% to $43.5 million from $32.1 million. See After Hours.

Brooks Automation Inc. (BRKS) said it has received a grand jury subpoena from the U.S. Attorney for the Eastern District of New York requesting records related to the granting of stock options.

Cameron International Corp. (CAM) said it plans to offer $500 million of convertible notes due 2026, and to use net proceeds to repay notes due 2007, buy back shares, and for general corporate purposes.

Cbiz Inc. (CBIZ) said it plans to offer $85 million of convertible senior subordinated notes due 2026. The benefits specialist added that it plans to use 50% of the offering's proceeds to buy back shares, and the remaining proceeds will be used to repay a portion of the company's $100 million credit facility, or for other general corporate purposes.

DOV Pharmaceutical Inc. (DOVP) said bicifadine did not achieve a statistically significant effect relative to placebo in a trial of patients with chronic low back pain. The company added that it will delay starting seven Phase I clinical trials that are required to submit a new drug application for bicifadine.

Google Inc.'s (GOOG) growth rate, from a mathematical standpoint, will slow at some point, Chairman and Chief Executive Eric Schmidt said in a televised interview. The company has no idea exactly when that will occur, Schmidt added.

Government Properties Trust Inc. (GPT) said its board has engaged Wachovia Capital Markets LLC to assist in evaluating available alternatives such as strategic acquisitions or a merger to enhance shareholder value.

Immucor Inc. (BLUD) said it sees revenues for the fiscal year ending May 31, 2007 ranging from $204 million to $212 million. The provider of systems to the blood transfusion industry said it expects fiscal 2007 net income of $48.5 million to $52 million, or 69 cents to 74 cents on a per-share basis.

Mentor Corp. (MNT) reported fourth-quarter net earnings of $15 million, or 31 cents a share, up 80% from $8.36 million, or 19 cents a share, in the year-ago period. Revenue at the Santa Barbara, Calif.-based medical supply company rose 5.4% to $72.4 million from $68.7 million.

Mossimo Inc. (MOSS) said its first-quarter net loss was $1.17 million, or 7 cents a share. For the same period in the prior year, the clothing designer reported net income of $1.82 million, or 12 cents a share. Mossimo said first-quarter revenue was $4.94 million, down from $8.66 million in the prior year.

Pioneer Natural Resources Co. (PXD) said it has amended its stockholder rights plan. The right attached to each share of the Dallas-based oil and gas company's stock will become exercisable only if a person or group acquires 20% or more of Pioneer's outstanding voting stock or announces a tender or exchange offer that would result in ownership of 20% or more of Pioneer's voting stock. The ownership threshold was previously 15%.

Precision Castparts Corp. (PCP) after Monday's closing bell said it has received clearance from the Federal Trade Commission to buy Special Metals Corp. for more than $500 million. Precision Castparts said it expects the deal to close within the next two weeks.

RightNow Technologies Inc. (RNOW) said it bought Salesnet Inc., a Boston-based privately held provider of sales workflow automation software, for an undisclosed cash amount. Bozeman, Mont.-based RightNow expects the deal to trim its net per-share profit for the year and to be neutral to its cash flow from operations for 2006.

Tempur-Pedic International Inc. (TPX) said its board has increased its share buyback program by $40 million to $220 million.

Teva Pharmaceutical Industries Ltd. (TEVA) said the Food and Drug Administration has granted approval for the company's generic version of Forest Laboratories Inc.'s (FRX) Lexapro tablets, a treatment for depression.

XM Satellite Radio Holdings Inc. (XMSR) said its agreement to acquire privately held WCS Wireless has been terminated. XM said it was unable to obtain the necessary government approvals for the transaction.

Wet Seal Inc. (WTSLA) said the first-quarter net loss was $13.7 million, or 22 cents a share, compared with a net loss of $8.55 million, or 23 cents a share, during the same period in the prior year. The apparel retailer said revenue was $125.1 million, up from $103.8 million.