| CUSIP No. 042698308 |
SCHEDULE
13D
|
PAGES 2
OF 5
|
| 1. |
Name
of Reporting Persons
|
| 2. |
Check
the Appropriate Box if a Member of a Group (See
Instructions)
|
| 3. |
SEC
Use Only
|
| 4. |
Source
of Funds (See Instructions)
|
| 5. |
Check
if Disclosure of Legal Proceedings Is Required Pursuant to Items
2(d) or
2(e) o
|
| 6. |
Citizenship
or Place of Organization
|
|
Number
of
Shares
Bene-
ficially
by
Owned
by Each
Reporting
Person
With
|
7. Sole Voting Power
288,484
8. Shared Voting Power
9. Sole
Dispositive Power 288,484
10.
Shared Dispositive Power
|
| 11. |
Aggregate
Amount Beneficially Owned by Each Reporting
Person
|
| 12. |
Check
Box if the Aggregate Amount in Row (11) Excludes Certain Shares*
o
|
| 13. |
Percent
of Class Represented by Amount in Row
(11)
|
| 14. |
Type
of Reporting Person (See Instructions)
|
| CUSIP No. 042698308 |
SCHEDULE
13D
|
PAGES 3
OF 5
|
| (a) |
Chambers
Medical Foundation is a private foundation organized in the form
of a
charitable trust under the laws of the State of Louisiana. Chambers
Medical Foundation received its IRS determination letter recognizing
it as
an exempt organization under Section 501(c)(3) of the Internal Revenue
Code on October 30, 1990.
|
| (b) |
Chambers
Medical Foundation’s principal office is located at 1807 Lake Street, Lake
Charles, Louisiana 70601.
|
| (c) |
Chambers
Medical Foundation’s principal business is providing grants for medical
research.
|
| (d) |
Chambers
Medical Foundation has not been a party to a civil proceeding of
a
judicial or administrative body of competent jurisdiction during
the last
five years and was not and is not, as a result of such proceeding,
subject
to a judgment, decree, or final order enjoining future violations
of, or
prohibiting or mandating activities subject to, federal or state
securities laws or finding any violation with respect to such
laws.
|
| (e) |
Chambers
Medical Foundation is administered by Edwin K. Hunter,
Trustee.
|
| (i) |
Edwin
K. Hunter’s address is 903 Baker Road, Westlake, Louisiana
70669.
|
| (ii) |
Edwin
K. Hunter’s principal occupation is his law
practice.
|
| (iii) |
Edwin
K. Hunter has not been convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors) during the last five
years.
|
| (iv) |
Edwin
K. Hunter has not been a party to a civil proceeding of a judicial
or
administrative body of competent jurisdiction during the last five
years
and was not and is not, as a result of such proceeding, subject to
a
judgment, decree, or final order enjoining future violations of,
or
prohibiting or mandating activities subject to, federal or state
securities laws or finding any violation with respect to such
laws.
|
| (v) |
Edwin
K. Hunter is a citizen of the United
States.
|
| CUSIP No. 042698308 |
SCHEDULE
13D
|
PAGES 4
OF 5
|
| (a) | Chambers Medical Foundation 288,484 10.8% |
|
(b)
|
Chambers
Medical Foundation has the sole power to vote and the sole power
to
dispose or direct the disposition of all of the shares of Common
Stock
listed in subpart (a) of this Item.
|
|
(c)
|
The
following transactions in Common Stock of ART were effected by
Chambers
Medical Foundation since the last Schedule 13D
filing:
|
|
Date
|
Amount
of Securities
|
Price/Share
|
Where
and How Effected
|
|
12/05/06
|
31,010
|
$27.0726
|
Sold
on Open Market
|
|
12/06/06
|
18,990
|
$26.6571
|
Sold
on Open Market
|
|
12/08/06
|
12,500
|
26.6968
|
Sold
on Open Market
|
| CUSIP No. 042698308 |
SCHEDULE
13D
|
PAGES 5
OF 5
|
| CHAMBERS MEDICAL FOUNDATION | ||
| |
|
|
| Date: March 8, 2007 | By: | /s/ Edwin K. Hunter, Trustee |
|
|
||
| Edwin K. Hunter, Trustee | ||