Document:

EXHIBIT 10.7
                                                                    ------------

                              AMENDED AND RESTATED
                                 PROMISSORY NOTE
$171,666.67                                                        JULY 31, 2001
                                  DALLAS, TEXAS

         FOR VALUE RECEIVED, the undersigned, MedSolutions, Inc., formerly known
as EnviroClean International, Inc. or Advanced EnviroTech Systems, Inc., a Texas
corporation  (the  "Maker"),  hereby  promises  to pay to the  order  of Mark M.
Altenau,  M. D.  ("Payee"),  at Dallas,  Texas,  or at such other address as the
holder of this Note may  designate  from time to time in writing  to Maker,  the
principal sum of ONE HUNDRED  SEVENTY ONE THOUSAND SIX HUNDRED SIXTY SIX DOLLARS
AND SIXTY-SEVEN CENTS ($171,666.67),  with said loan to bear interest at no more
than ten  percent  (10%) per  annum  and to be  payable  on July 31,  2002.  The
principal  amount  of this  Note  shall be due and  payable  July 31,  2002 (the
"Maturity Date"). No principal payments on this Note are allowed for a period of
twenty-four  (24) months  following  the original loan on July 31, 2000 or until
July 31,  2002.  The Payee has the  option to  convert  the loan  principal  and
accrued  interest  thereon  into shares of AES Common Stock par value $0.001 per
share at the rate of One dollar and Twenty Five cents ($1.25) per share.

         This Note is  collateralized  by the  so-called  "IMCO  Contract  being
negotiated  with the Kingdom of Saudi Arabia",  specifically  from the royalties
from the sale of an estimated  twenty (20)  EnviroClean  EC-500  Systems to said
customer  and by the  patented  technology  known  as  the  EnviroClean  Thermal
Oxidation  System and by all of the other tangible and  intangible  property and
assets of MedSolutions, Inc. and any subsidiary thereof.

         This Amended and  Restated  Promissory  Note and the  security  created
hereby shall  terminate as of the date on which the  obligations,  and any other
amounts  that the Maker may owe to the Payee as a result of this Note,  are paid
or renegotiated in writing.

         The makers, signers,  sureties,  guarantors, and endorsers of this Note
severally  waive  valuation  and  appraisal,  demand,  presentment,   notice  of
dishonor,  notice of intent to demand or accelerate  payment  hereof,  notice of
demand,  notice of acceleration,  diligence in collecting,  grace,  notice,  and
protest.  If this Note  shall be  collected  by legal  proceedings  or through a
probate or bankruptcy  court, or shall be placed in the hands of an attorney for
collection  after  default  or  maturity,  the Maker  agrees to pay all costs of
collection, including reasonable attorneys' fees and expenses and court costs.

         Interest on the indebtedness evidenced by this Note is hereby expressly
limited so that in no contingency or event  whatsoever,  whether by acceleration
of the maturity of this Note or otherwise,  shall the interest  contracted  for,
charged,  or received by the Payee  exceed the highest  lawful rate  permissible
under applicable law. If any circumstances whatsoever shall involve transcending
the limit of validity  prescribed by law, then, ipso facto, the obligation to be
fulfilled  shall be reduced to the limit of such validity,  and if from any such
circumstances  the Payee  shall ever  receive  anything  of value as interest or
deemed  interest  by  applicable  law  under  this  Note or any  other  document
evidencing,  securing, or pertaining to the indebtedness  evidenced hereby, such
amount that would be excessive interest shall be applied to the reduction of the
principal  amount owing under this Note or on account of any other  indebtedness
of the  Maker to the  Payee,  and not to the  payment  of  interest,  or if such
excessive interest exceeds the unpaid balance of principal of this Note and such
other  indebtedness,  such excess shall be refunded to the Maker. In determining
whether or not the interest paid or payable with respect to any  indebtedness of
the Maker to the Payee,  under any  specific  contingency,  exceeds  the highest
lawful rate, the Maker and the Payee shall,  to the maximum extent  permitted by

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applicable law, (a) characterize any non-principal  payment as an expense,  fee,
or premium rather than as interest;  (b) exclude  voluntary  prepayments and the
effects thereof; (c) amortize, prorate, allocate, and spread the total amount of
interest  throughout the full term of such  indebtedness so that the actual rate
of interest on account of such  indebtedness  does not exceed the highest lawful
rate permitted by applicable law; and/or (d) allocate  interest between portions
of such  indebtedness,  to the end that no such portion shall bear interest at a
rate greater than the highest lawful rate permitted by applicable law. The terms
and  provisions  of this  paragraph  shall  control  and  supersede  every other
conflicting provision of this Note.

         The term  "applicable  law" means the  applicable  laws of the State of
Texas or applicable laws of the United States,  whichever laws allow the greater
rate of  interest,  as such laws now exist or may be  changed or amended or come
into effect in the future.

         THIS NOTE SHALL BE GOVERNED BY AND CONSTRUED AND ENFORCED IN ACCORDANCE
WITH  THE  LAWS  OF THE  STATE  OF  TEXAS  APPLICABLE  TO  AGREEMENTS  EXECUTED,
DELIVERED,  AND PERFORMED IN THE CITY OF DALLAS,  DALLAS COUNTY,  TEXAS, WITHOUT
GIVING EFFECT TO THE CONFLICT OF LAWS RULES OR CHOICE OF LAWS RULES THEREOF.

         EXECUTED effective as of the date first set forth above.

                                         MEDSOLUTIONS, INC.

                                         By:  /s/ MATTHEW FLEEGER
                                             -----------------------------------

                                         Name: Matthew Fleeger

                                         Title: President/CEO

/s/ MARK ALTENAU, M.D.
----------------------
Mark M. Altenau, M.D.EXHIBIT 10.8
                                                                    ------------

                              AMENDED AND RESTATED
                                 LOAN CONVERSION
                                       AND
                             COMMON STOCK AGREEMENT

THE ORIGINAL LOAN CONVERSION AND COMMON STOCK AGREEMENT  ("Agreement")  made and
effective July 31, 2000 by and between MedSolutions, Inc.(MSI) formerly known as
EnviroClean  International,  Inc. or Advanced EnviroTech Systems, Inc., and Mark
M.  Altenau,  M.D.  ("Altenau"),  the  Parties is hereby  AMENDED  AND  RESTATED
effective July 31, 2001.

Prior to July 31, 2000 MSI was indebted to Altenau in the amount of  One-Million
and no/100 Dollars  ($1,000,000.00)  for funds previously  loaned to MSI with an
extended maturity date of May 31, 2001 plus accrued interest.

MSI agreed to convert  such prior debt to Altenau into shares of common stock of
MSI as set forth below.

NOW THEREFORE, MSI and Altenau agreed as follows:

1. DEFINITIONS.

         A.       "Obligation". All of the interest, principal and other amounts
                  payable  under the Notes and  Agreements  between the parties,
                  dated prior to March 31, 1999, repayment of which was extended
                  until May 31, 2001, under a Loan Extension Agreement dated May
                  31, 1999.

         B.       "Extension".  The due and  payable  date on  above  referenced
                  notes was extended to May 31, 2001.

         C.       "Interest". The annual percentage rate of interest shall be no
                  more than ten percent (10%) per annum.

         D.       "Conversion".  All of the unpaid loan  principal  amounting to
                  One-Million and no/100 Dollars  ($1,000,000.00)  was converted
                  into   One-Million-Eight-Hundred-Fifty-Thousand    (1,850,000)
                  shares of ENVI Common  Stock par value  $0.001 per share at an
                  average price of fifty-four and five hundreth cents  ($0.5405)
                  per share.

         E.       "Accrued  interest".  All accrued interest associated with the
                  unpaid  loan to July 31,  2000 was paid to Altenau in the form
                  of     a     new      loan      in     the      amount      of
                  One-Hundred-Sixteen-Thousand-Six-Hundred-Sixty-Six Dollars and
                  Sixty-Seven  cents  ($116,666.67),   said  new  loan  to  bear
                  interest at no more than ten percent (10%) per annum and to be
                  payable on July 31, 2002.

         F.       "New Loan".  New loan will be secured by the  so-called  "IMCO
                  Contract being  negotiated  with the Kingdom of Saudi Arabia,"
                  specifically  from the royalties from the sale of an estimated
                  twenty (20) EnviroClean EC-500 Systems to said customer and by
                  the  patented  technology  known  as the  EnviroClean  Thermal
                  Oxidation.

         G.       "Repayment/Conversion."  No principal payments on the new loan
                  are allowed for a period of twenty-four  (24) months from July
                  31,  2000  until July 31,  2002.  The new loan  principal  and

<PAGE>

                  accrued  interest  thereon was convertible into shares of ENVI
                  Common  Stock  par value  $0.001  per share at the rate of One
                  dollar and Fifty cents ($1.50) per share on a pre split basis.

         H.       "Cash   Investment."  In  consideration   for  accepting  this
                  agreement,   Altenau   agreed  to  make  an  additional   cash
                  investment  in the  following  amount on July 31, 2000: A cash
                  investment of Fifty-Thousand  and no/100 Dollars  ($50,000.00)
                  in exchange for  Fifty-Thousand  (50,000) shares of MSI Common
                  Stock par  value  $0.001  per  share at a price of One  dollar
                  ($1.00) per share.

         I.       "Further Cash Investment." In consideration for Altenau making
                  further  cash loans or advances  available  to MSI for working
                  capital or other purposes during any period subsequent to July
                  31, 2000, Altenau and MSI amend this agreement as follows: (1)
                  that such further loans or advances be added to the balance of
                  the new loan principal and accrued interest discussed in items
                  C and E through  G above,  (2) that the  conversion  price per
                  share of the total of all loans and advances  plus any accrued
                  interest  thereon  be  changed  to permit  the  principal  and
                  accrued  interest  thereon to be converted  into shares of MSI
                  Common  Stock  par value  $0.001  per share at the rate of One
                  dollar and Twenty Five cents  ($1.25) per share,  and (3) that
                  the security  for the loans and advances and accrued  interest
                  thereon  be  extended  to  include  all  other   tangible  and
                  intangible  property  and assets of MSI and of any  subsidiary
                  thereof.

2. REPRESENTATIONS AND WARRANTIES OF MSI.
MSI  represents  and  warrants  to  Altenau  that  this  Agreement  is  in  full
satisfaction  of the  original  extended  obligation  to  Altenau.  MSI  further
represents  that it has used its best efforts to  negotiate on Altenau's  behalf
Altenau's right to sell up to $1,500,000.00  worth of common stock through Lilly
Beter  Capital  Group,  Inc.  (LBCG)  following  the  issuance  of the LBCG Firm
Commitment  Letter to ENVI by LBCG  under the terms  specified  in the Letter of
Intent dated June 26, 2000 and a successful Form SB10  registration by MSI which
results in MSI becoming a publicly traded stock on the OTC markets.

3. FINAL AGREEMENT.

This Amended and Restated Loan Conversion and Common Stock Agreement constitutes
the final agreement and understanding  between the parties on the subject matter
hereof and supersedes  all prior  understandings  or agreements  whether oral or
written.  This Agreement may be modified only by a further  writing that is duly
executed by both parties.

4. HEADINGS.
Headings used in this Amended and Restated Loan  Conversion and Preferred  Stock
Agreement  are provided for  convenience  only and shall not be used to construe
meaning or intent.

IN WITNESS WHEREOF, Mark M. Altenau,  M.D. and MedSolutions,  Inc. have executed
this Amended and Restated Loan Conversion and Common Stock Agreement on July 31,
2001.

                                               MEDSOLUTIONS, INC.

/s/ MARK ALTENAU                               By:  /s/ MATTHEW H. FLEEGER
------------------                                 -----------------------------
Mark Altenau, M.D.                                 Matthew H. Fleeger, President

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