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    <element id="nthi_AccruedAdvisoryFeeRelatedParty" name="AccruedAdvisoryFeeRelatedParty" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LitigationSettlementPayable" name="LitigationSettlementPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LongTermLiabilitiesAbstract" name="LongTermLiabilitiesAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LeaseLiabilityNetOfCurrentPortion" name="LeaseLiabilityNetOfCurrentPortion" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LegalAndProfessional" name="LegalAndProfessional" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryFees" name="AdvisoryFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LossOnExtinguishmentOfBridgeLoanRelatedParty" name="LossOnExtinguishmentOfBridgeLoanRelatedParty" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LossOnChangeInFairValueOfDerivativeLiabilityRelatedToSalesOfCommonStockThroughEquityLineOfCredit" name="LossOnChangeInFairValueOfDerivativeLiabilityRelatedToSalesOfCommonStockThroughEquityLineOfCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SaleOfCommonStockNetOfOfferingCosts" name="SaleOfCommonStockNetOfOfferingCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SaleOfCommonStockNetOfOfferingCostsShares" name="SaleOfCommonStockNetOfOfferingCostsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForBridgeLoanConversion" name="CommonStockIssuedForBridgeLoanConversion" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForBridgeLoanConversionShares" name="CommonStockIssuedForBridgeLoanConversionShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForSettlementOfVendorPayable" name="CommonStockIssuedForSettlementOfVendorPayable" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForSettlementOfVendorPayableShares" name="CommonStockIssuedForSettlementOfVendorPayableShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForNotePayableConversion" name="CommonStockIssuedForNotePayableConversion" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForNotePayableConversionShares" name="CommonStockIssuedForNotePayableConversionShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForSettlementOfAccruedCompensation" name="CommonStockIssuedForSettlementOfAccruedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForSettlementOfAccruedCompensationShares" name="CommonStockIssuedForSettlementOfAccruedCompensationShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForAdvisoryServices" name="CommonStockIssuedForAdvisoryServices" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonStockIssuedForAdvisoryServicesShares" name="CommonStockIssuedForAdvisoryServicesShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CashlessExerciseOfWarrants" name="CashlessExerciseOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CashlessExerciseOfWarrantsShares" name="CashlessExerciseOfWarrantsShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_Other" name="Other" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromSaleOfCommonStockPursuantToEquityLineOfCredit" name="ProceedsFromSaleOfCommonStockPursuantToEquityLineOfCredit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromSaleOfCommonStockPursuantToEquityLineOfCreditShares" name="ProceedsFromSaleOfCommonStockPursuantToEquityLineOfCreditShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_IncreaseInBridgeLoanExpensesPaidByBridgeLoanProviderOnBehalfOfCompany" name="IncreaseInBridgeLoanExpensesPaidByBridgeLoanProviderOnBehalfOfCompany" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AccretionOfOriginalIssueDiscountOnBridgeLoansRelatedParty" name="AccretionOfOriginalIssueDiscountOnBridgeLoansRelatedParty" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AccretionOfOriginalIssueDiscountOnConvertiblePromissoryNote" name="AccretionOfOriginalIssueDiscountOnConvertiblePromissoryNote" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LossOnExtinguishmentOfBridgeLoan" name="LossOnExtinguishmentOfBridgeLoan" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_IncreaseDecreaseInAccruedAdvisoryFee" name="IncreaseDecreaseInAccruedAdvisoryFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DeferredOfferingCostss" name="DeferredOfferingCostss" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromSaleOfCommonStockPursuantToEquityPurchaseAgreement" name="ProceedsFromSaleOfCommonStockPursuantToEquityPurchaseAgreement" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DisclosureRelatedPartyLoansPayableAbstract" name="DisclosureRelatedPartyLoansPayableAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_RelatedPartyLoansPayableDisclosureTextBlock" name="RelatedPartyLoansPayableDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DisclosureConvertibleDebtAbstract" name="DisclosureConvertibleDebtAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ConvertibleDebtTextBlock" name="ConvertibleDebtTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DisclosureCommonAndPreferredStockAbstract" name="DisclosureCommonAndPreferredStockAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CommonAndPreferredStockDisclosureTextBlock" name="CommonAndPreferredStockDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DisclosureStockbasedCompensationAbstract" name="DisclosureStockbasedCompensationAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ShareBasedCompensationDisclosureTextBlock" name="ShareBasedCompensationDisclosureTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DeferredOfferingCostsPoliciesTextBlock" name="DeferredOfferingCostsPoliciesTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsPoliciesTextBlock" name="WarrantsPoliciesTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PatentCostsPoliciesTextBlock" name="PatentCostsPoliciesTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ReclassificationsPolicyTextBlock" name="ReclassificationsPolicyTextBlock" nillable="true" xbrli:periodType="duration" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_EscrowReleased" name="EscrowReleased" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_UpfrontPayment" name="UpfrontPayment" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AmendmentFees" name="AmendmentFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryFeeExpense" name="AdvisoryFeeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryFeePaid" name="AdvisoryFeePaid" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AnnualPatentMaintenanceFee" name="AnnualPatentMaintenanceFee" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_RoyaltiesPercentage" name="RoyaltiesPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_UtilizesLaboratoryAndPatentMaintenanceServices" name="UtilizesLaboratoryAndPatentMaintenanceServices" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_UtilizesLaboratoryAndPatentMaintenanceServicesPayable" name="UtilizesLaboratoryAndPatentMaintenanceServicesPayable" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AccruedCompensation" name="AccruedCompensation" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_OriginalIssueDiscount" name="OriginalIssueDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_MaximumBorrowing" name="MaximumBorrowing" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DueFromRelatedParty" name="DueFromRelatedParty" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PurchasePriceOfConvertiblePromissoryNotes" name="PurchasePriceOfConvertiblePromissoryNotes" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LessUnamortizedOriginalIssuanceDiscount" name="LessUnamortizedOriginalIssuanceDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LessUnamortizedDebtIssuanceCost" name="LessUnamortizedDebtIssuanceCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_NetConvertiblePromissoryNote" name="NetConvertiblePromissoryNote" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_BaseRent" name="BaseRent" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_LeaseIncreasesPercentage" name="LeaseIncreasesPercentage" nillable="true" xbrli:periodType="duration" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_CashPaidForAmountsIncludedInMeasurementOfLeaseLiability" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ReleaseOfRestrictedStockUnits" name="ReleaseOfRestrictedStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PrivatePlacementDescription" name="PrivatePlacementDescription" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_PlacementAgentFees" name="PlacementAgentFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AdvisoryServicesFees" name="AdvisoryServicesFees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_DeferredOfferingCostsIncurred" name="DeferredOfferingCostsIncurred" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ReleasedRestrictedStockUnits" name="ReleasedRestrictedStockUnits" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SharedBasedCompensationReversal" name="SharedBasedCompensationReversal" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_FairValueOfRsus" name="FairValueOfRsus" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_RestrictedStockUnitsRemainUnissued" name="RestrictedStockUnitsRemainUnissued" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_NumberOfWarrantsToPurchase" name="NumberOfWarrantsToPurchase" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsIssued" name="WarrantsIssued" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsVested" name="WarrantsVested" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_WarrantsExercised" name="WarrantsExercised" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_ProceedsFromGrant" name="ProceedsFromGrant" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_SubcontractorCosts" name="SubcontractorCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_AllowableExpenses" name="AllowableExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_InvestorRelations" name="InvestorRelations" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="nthi_InterestExpenseRelatedPartiesLoans" name="InterestExpenseRelatedPartiesLoans" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
</schema>
