lyophilized powder raises a handful of sensible questions. This page answers them in order, starting with the fundamentals and moving to applications.
This page was last updated on 2025-08-13 and is reviewed periodically as new material appears.
Development has progressed from single- and multiple-ascending-dose studies in healthy volunteers into larger randomized trials in adults with obesity, type 2 diabetes, and fatty liver disease. Early reports describe dose-dependent reductions in body weight and improvements in glycemic markers over treatment periods of several months. Whether the glucagon arm adds tolerability cost without added benefit is still debated. Long-term cardiovascular outcomes, effects after treatment stops, and performance in older or comorbid populations are open questions rather than settled findings. Approval status may change, so the current investigational label should be confirmed against regulatory sources.
Retatrutide is an investigational synthetic peptide developed under the code LY3437943, with a backbone derived from glucose-dependent insulinotropic polypeptide. Several non-proteinogenic residues, including alpha-aminoisobutyric acid, appear in that backbone, and a fatty diacid side chain attached through a linker extends circulation time. The molecule carries roughly thirty-nine amino acid units and a total mass near 4.7 kilodaltons. Administration is by subcutaneous injection once weekly. Published work uses both the name retatrutide and the code LY3437943.
Pharmacologically the compound activates three receptors: GLP-1, GIP, and glucagon. GLP-1 and GIP signaling contribute to glucose-dependent insulin release, delayed gastric emptying, and reduced appetite, while glucagon receptor activation is associated with increased energy expenditure and hepatic fat oxidation. The single-molecule design is intended to keep these activities in one peptide rather than combining separate agents. Relative activity at each receptor differs, and the balance between them is a central question in interpretation. The glucagon component is partly offset by incretin-mediated insulin secretion, an interaction that remains incompletely characterized.
Stability studies examine how the molecule changes under defined conditions of temperature, humidity, and light exposure over time. Results are used to set storage recommendations and shelf-life limits. In practice, lyophilized peptide material is often stored at low temperatures to slow degradation, while reconstituted solutions are handled more carefully because they are generally less stable. Reported stability data apply to specific formulations and conditions, so extrapolation to other preparations requires caution.
Retatrutide is handled in laboratories mainly as a lyophilized solid for analytical and biochemical research. The peptide is typically supplied as a white to off-white powder and is reconstituted in appropriate solvents before use. Because peptide-based molecules are sensitive to temperature, moisture, and repeated freeze-thaw cycles, proper storage conditions affect both stability and measurement accuracy. Laboratories generally follow documented handling procedures to maintain the integrity of the material across experiments.
| Property | Value | Notes |
|---|---|---|
| Molecular class | Synthetic peptide of about 39 residues | Backbone derived from a GIP sequence |
| Molecular mass | Approximately 4.7 kDa | Peptide chain plus fatty diacid moiety |
| Receptor targets | GLP-1, GIP, glucagon | Unimolecular triple agonist |
| Typical storage temperature | 2 to 8 degrees Celsius | Protect from light; avoid repeated freeze-thaw |
| Common analytical method | LC-MS/MS | Used for plasma quantification and purity checks |
开发进程从早期单次和多次给药研究推进至大规模后期试验。公开报告显示，参与者在体重和相关代谢指标上出现变化，但完整数据需经同行评审并接受独立复核。试验设计通常包括随机、双盲和对照设置，以区分药物效应与行为干预。监管提交和标签范围尚未确定；长期维持效果与心血管结局仍是开放问题。
与仅靶向单一受体的同类药物相比，瑞他鲁肽增加胰高血糖素受体成分，理论上可提高能量消耗并改变脂肪分布。临床中观察到的体重变化是否主要来自该额外机制，目前尚无定论。胃肠道反应是该类药物常见不良事件，试验中通过剂量递增和监测进行管理。停药后体重反弹、个体差异和长期耐受性仍需更多数据。
瑞他鲁肽是一种在研合成肽，同时作用于胰高血糖素样肽-1、葡萄糖依赖性促胰岛素多肽和胰高血糖素受体。该分子属于多受体激动剂类别，尚未获得任何监管机构的上市批准。当前临床开发主要针对肥胖和2型糖尿病，研究代号为LY3437943。已确立的信息包括受体靶点和部分中期试验结果；最终疗效、长期安全性和适用人群仍属开放问题。
Dissolution behavior depends on the amino acid sequence, the counterion content, and the buffer chosen. Many peptides disperse readily in water or mild aqueous buffers, while others require a small amount of organic co-solvent or a change in pH. Adsorption to plastic and glass surfaces can reduce the concentration of a solution over time, particularly at low concentrations. Filtration before analysis removes particulates, and aliquoting limits repeated freeze-thaw cycles that stress the material.
Research-grade peptide material is commonly supplied as a lyophilized powder, a form that limits degradation during transport and storage. Standard practice keeps such material cold and protected from light and moisture, with tighter conditions used for long-term archives. Once dissolved, solutions are generally considered less stable than the dry powder and are handled on shorter timescales. These established conventions derive largely from general peptide chemistry rather than from compound-specific evidence alone.
== ISO 9000 – ISO 9999 == ISO 9000:2015 Quality management systems – Fundamentals and vocabulary ISO 9001:2015 Quality management systems – Requirements ISO/TS 9002:2016 Quality management systems – Guidelines for the application of ISO 9001:2015 ISO 9004:2018 Managing for the sustained success of an organization – A quality management approach ISO/TR 9007:1987 Information processing systems - Concepts and terminology for the conceptual schema and the information base ISO 9019:1995 Securities – Numbering of certificates ISO 9022 Optics and optical instruments - Environmental test methods ISO 9022-1:2016 Definitions, extent of testing ISO 9022-2:2015 Cold, heat and humidity ISO 9022-3:2015 Mechanical stress ISO 9022-4:2014 Salt mist ISO 9022-5:1994 Combined cold, low air pressure [Withdrawn: replaced by ISO 9022-23:2016] ISO 9022-6:2015 Dust ISO 9022-23:2016 Low pressure combined with cold, ambient temperature and dry or damp heat ISO 9031:1987 Air cargo equipment - Handling systems for unit load devices (ULDs) - Symbols for pictorial representation ISO 9036:1987 Information processing - Arabic 7-bit coded character set for information interchange ISO/IEC 9040:1997 Information technology – Open Systems Interconnection – Virtual Terminal Basic Class Service ISO/IEC 9041 Information technology – Open Systems Interconnection – Virtual Terminal Basic Class Protocol ISO/IEC 9041-1:1997 Part 1: Specification ISO/IEC 9041-2:1997 Part 2: Protocol Implementation Conformance Statement (PICS) proforma ISO 9045:1990 Industrial screens and screening – Vocabulary ISO 9050 Glass in building – Determination of light transmittance, solar direct transmittance, total solar energy transmittance, ultraviolet transmittance and related glazing factors ISO 9060: Solar energy -- Specification and classification of instruments for measuring hemispherical solar and direct solar radiation ISO/IEC 9066 Information technology – Open Systems Interconnection – Reliable Transfer ISO/IEC 9066-1:1989 Part 1: Model and service definition ISO/IEC 9066-2:1989 Part 2: Protocol specification ISO/IEC 9066-3:1996 Protocol Implementation Conformance Statement (PICS) proforma ISO 9069:1988 Information processing – SGML support facilities – SGML Document Interchange Format (SDIF) ISO/IEC 9070:1991 Information technology - SGML support facilities - Registration procedures for public text owner identifiers ISO/IEC 9072 Information technology – Open Systems Interconnection – Remote Operations ISO/IEC 9072-1:1989 Part 1: Model, notation and service definition ISO/IEC 9072-2:1989 Part 2: Protocol specification ISO/IEC 9072-3:1996 Protocol Implementation Conformance Statement (PICS) proforma ISO/IEC 9075 Information technology – Database languages – SQL ISO 9086 Wood – Methods of physical and mechanical testing – Vocabulary ISO 9086-1:1987 Part 1: General concepts and macrostructure ISO 9092:2011 Textiles – Nonwovens – Definition ISO 9095:1990 Steel tubes – Continuous character marking and colour coding for material identification ISO 9123:2001 Measurement of liquid flow in open channels – Stage-fall-discharge relationships ISO/IEC 9126 Software engineering – Product quality ISO 9128:2006 Road vehicles - Graphical symbols to designate brake fluid types ISO 9141 Road vehicles – Diagnostic systems ISO 9141-2 CARB requirements for interchange of digital information ISO 9141-3 Verification of the communication between vehicle and OBD II scan tool ISO 9144:1991 Securities – Optical character recognition line – Position and structure ISO 9160:1988 Information processing - Data encipherment - Physical layer interoperability requirements ISO 9170 Terminal units for medical gas pipeline systems ISO 9170-1:2017 Part 1: Terminal units for use with compressed medical gases and vacuum ISO 9170-2:2008 Part 2: Terminal units for anaesthetic gas scavenging systems ISO/IEC 9171 Information technology - 130 mm optical disk cartridge, write once, for information interchange ISO/IEC 9171-1:1990 Part 1: Unrecorded optical disk cartridge ISO/IEC 9171-2:1990 Part 2: Recording format ISO 9175 Tubular tips for hand-held technical pens using India ink on tracing paper ISO 9175-1:1988 Part 1: Definitions, dimensions, designation and marking ISO 9177 Mechanical pencils for technical drawings ISO 9177-1:2016 Part 1: Classification, dimensions, performance requirements and testing ISO 9177-2:1989 Part 2: Black leads – Classification and dimensions ISO 9177-3:1994 Part 3: Black leads – Bending strengths of HB leads ISO 9180:1988 Black leads for wood-cased pencils – Classification and diameters ISO 9186 Graphical symbols - Test methods ISO 9186-1:2014 Part 1: Method for testing comprehensibility ISO 9186-2:2008 Part 2: Method for testing perceptual quality ISO 9186-3:2014 Part 3: Method for testing symbol referent association ISO 9187 Injection equipment for medical use ISO 9187-1:2010 Part 1: Ampoules for injectables ISO 9187-2:2010 Part 2: One-point-cut (OPC) ampoules ISO 9195:1992 Liquid flow measurement in open channels – Sampling and analysis of gravel-bed material ISO 9196:1992 Liquid flow measurement in open channels – Flow measurements under ice conditions ISO 9211 Optics and photonics - Optical coatings ISO 9211-1:2010 Part 1: Definitions ISO/TR 9212:2015 Hydrometry – Methods of measurement of bedload discharge ISO 9222 Technical drawings – Seals for dynamic application ISO 9222-1:1989 Part 1: General simplified representation ISO 9222-2:1989 Part 2: Detailed simplified representation ISO 9223 Corrosion of metals and alloys - Corrosivity of atmospheres - Classification, determination and estimation ISO 9224 Corrosion of metals and alloys - Corrosivity of atmospheres - Guiding values for the corrosivity categories ISO 9225 Corrosion of metals and alloys - Corrosivity of atmospheres - Measurement of environmental parameters affecting corrosivity of atmospheres ISO 9226 Corrosion of metals and alloys - Corrosivity of atmospheres - Determination of corrosion rate of standard specimens for the evaluation of corrosivity ISO 9227:2017 Corrosion tests in artificial atmospheres – Salt spray tests ISO 9229:2007 Thermal insulation - Vocabulary ISO 9230:2007 Information and documentation - Determination of price indexes for print and electronic media purchased by libraries ISO 9232:2003 Yogurt – Identification of characteristic microorganisms (Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus) ISO 9235:2013 Aromatic natural raw materials – Vocabulary ISO 9241 Ergonomics of human-system interaction ISO 9244:2008 Earth-moving machinery - Machine safety labels - General principles ISO 9245:1991 Earth-moving machinery – Machine productivity – Vocabulary, symbols and units ISO 9247:1990 Earth-moving machinery – Electrical wires and cables – Principles of identification and marking ISO/TS 9250 Earth-moving machinery – Multilingual listing of equivalent terms ISO/TS 9250-1:2012 Part 1: General ISO/TS 9250-2:2012 Part 2: Performance and dimensions ISO 9251:1987 Thermal insulation - Heat transfer conditions and properties of materials - Vocabulary ISO 9264:1988 Woodworking machines – Narrow belt sanding machines with sliding table or frame – Nomenclature ISO 9265:1988 Woodworking machines – Multi-spindle boring machines – Nomenclature ISO 9266:1988 Woodworking machines – Universal tool and cutter sharpeners – Nomenclature ISO 9267:1988 Woodworking machines – Bandsaw blade sharpening machines – Nomenclature ISO 9268:1988 Implants for surgery – Metal bone screws with conical under-surface of head – Dimensions ISO 9269:1988 Implants for surgery – Metal bone plates – Holes and slots corresponding to screws with conical under-surface ISO/IEC 9281 Information technology - Picture coding methods ISO/IEC 9281-1:1990 Part 1: Identification ISO/IEC 9281-2:1990 Part 2: Procedure for registration ISO/IEC 9282 Information processing - Coded representation of pictures ISO/IEC 9282-1:1988 Part 1: Encoding principles for picture representation in a 7-bit or 8-bit environment ISO 9288:1989 Thermal insulation – Heat transfer by radiation – Physical quantities and definitions ISO/IEC 9293:1994 Information technology – Volume and file structure of disk cartridges for information interchange ISO 9295:2015 Acoustics - Determination of high-frequency sound power levels emitted by machinery and equipment ISO 9296:2017 Acoustics - Declared noise emission values of information technology and telecommunications equipment ISO 9300:2005 Measurement of gas flow by means of critical flow Venturi nozzles ISO 9308 Water quality – Enumeration of Escherichia coli and coliform bacteria ISO 9308-1:2014 Part 1: Membrane filtration method for waters with low bacterial background flora ISO 9308-2:2012 Part 2: Most probable number method ISO 9308-3:1998 Part 3: Miniaturized method (Most Probable Number) for the detection and enumeration of E. coli in surface and waste water ISO 9314 Information processing systems Fibre Distributed Data Interface (FDDI) ISO 9314-1:1989 Part 1: Token Ring Physical Layer Protocol (PHY) ISO 9314-2:1989 Part 2: Token Ring Media Access Control (MAC) ISO/IEC 9314-3:1990 Part 3: Physical Layer Medium Dependent (PMD) ISO/IEC 9314-4:1999 Part 4: Single Mode Fibre Physical Layer Medium Dependent (SMF-PMD) ISO/IEC 9314-5:1995 Part 5: Hybrid Ring Control (HRC) ISO/IEC 9314-6:1998 Part 6: Station Management (SMT) ISO/IEC 9314-7:1998 Part 7: Physical layer Protocol (PHY-2) ISO/IEC 9314-8:1998 Part 8: Media Access Control-2 (MAC-2) ISO/IEC 9314-9:2000 Part 9: Low-cost fibre physical layer medium dependent (LCF-PMD) ISO/IEC 9314-13:1998 Part 13: Conformance Test Protocol Implementation Conformance Statement (CT-PICS) Proforma ISO/IEC 9314-20:2001 Part 20: Abstract test suite for FDDI physical medium dependent conformance testing (FDDI PMD ATS) ISO/IEC 9314-21:2000 Part 21: Abstract test suite for FDDI physical layer protocol conformance testing (FDDI PHY ATS) ISO/IEC 9314-25:1998 Part 25: Abstract test suite for FDDI - Station Management Conformance Testing (SMT-ATS) ISO/IEC 9314-26:2001 Part 26: Media Access Control Conformance Testing (MAC-ATS) ISO 9315:1989 Information processing systems - Interface between flexible disk cartridge drives and their host controllers ISO/IEC 9316:1995 Information technology - Small Computer System Interface-2 ISO/IEC 9316-2:2000 Information technology - Small computer system interface-2 (SCSI-2) - Part 2: Common Access Method (CAM) Transport and SCSI interface module ISO/IEC 9318 Information technology - Intelligent Peripheral Interface ISO/IEC 9318-2:1990 Part 2: Device specific command set for magnetic disk drives ISO/IEC 9318-3:1990 Part 3: Device generic command set for magnetic and optical disk drives ISO/IEC 9318-4:2002 Part 4: Device generic command set for magnetic tape drives (IPI-3 tape) ISO 9334:2012 Optics and photonics - Optical transfer function - Definitions and mathematical relationships ISO 9335:2012 Optics and photonics - Optical transfer function - Principles and procedures of measurement ISO 9342 Optics and optical instruments – Test lenses for calibration of focimeters ISO 9342-1:2005 Part 1: Test lenses for focimeters used for measuring spectacle lenses ISO 9342-2:2005 Part 2: Test lenses for focimeters used for measuring contact lenses ISO 9346:2007 Hygrothermal performance of buildings and building materials – Physical quantities for mass transfer – Vocabulary ISO 9360 Anaesthetic and respiratory equipment – Heat and moisture exchangers (HMEs) for humidifying respired gases in humans ISO 9360-1:2000 Part 1: HMEs for use with minimum tidal volumes of 250 ml ISO 9360-2:2001 Part 2: HMEs for use with tracheostomized patients having minimum tidal volumes of 250 ml ISO 9362:2014 Banking – Banking telecommunication messages – Business identifier code (BIC) ISO 9368 Measurement of liquid flow in closed conduits by the weighing method – Procedures for checking installations ISO 9368-1:1990 Part 1: Static weighing systems ISO 9394:2012 Ophthalmic optics – Contact lenses and contact lens care products – Determination of biocompatibility by ocular study with rabbit eyes ISO 9407 Shoe sizes – Mondopoint system of sizing and marking ISO 9431:1990 Construction drawings – Spaces for drawing and for text, and title blocks on drawing sheets ISO/TR 9464:2008 Guidelines for the use of ISO 5167:2003 ISO 9488:1999 Solar energy - Vocabulary ISO 9493:2010 Geometrical product specifications (GPS) – Dimensional measuring equipment: Dial test indicators (lever type) – Design and metrological characteristics ISO/IEC 9496:2003 CHILL - The ITU-T programming language ISO 9506 Industrial automation systems - Manufacturing Message Specification ISO/IEC 9529 Information processing systems - Data interchange on 90 mm (3,5 in) flexible disk cartridges using modified frequency modulation recording at 15 916 ftprad, on 80 tracks on each side ISO/IEC 9541 Information technology – Font information interchange ISO/IEC 9541-1:2012 Part 1: Architecture ISO/IEC 9541-2:2012 Part 2: Interchange Format ISO/IEC 9541-3:2012 Part 3: Glyph shape representation ISO/IEC 9541-4:2009 Part 4: Harmonization to Open Font Format ISO 9542:1988 Information processing systems – Telecommunications and information exchange between systems – End system to Intermediate system routeing exchange protocol for use in conjunction with the Protocol for providing the connectionless-mode network service (ISO 8473) ISO 9543:1989 Information processing systems – Information exchange between systems – Synchronous transmission signal quality at DTE/DCE interfaces ISO/IEC 9545:1994 Information technology – Open Systems Interconnection – Application Layer structure ISO/TR 9547:1988 Programming language processors - Test methods - Guidelines for their development and acceptability ISO/IEC 9548 Information technology – Open Systems Interconnection – Connectionless Session protocol ISO/IEC 9548-1:1996 Protocol specification ISO/IEC 9548-2:1995 Protocol Implementation Conformance Statement (PICS) proforma ISO/IEC 9549:1990 Information technology – Galvanic isolation of balanced interchange circuit ISO 9555 Measurement of liquid flow in open channels – Tracer dilution methods for the measurement of steady flow ISO 9555-1:1994 Part 1: General ISO 9555-3:1992 Part 3: Chemical tracers ISO 9555-4:1992 Part 4: Fluorescent tracers ISO 9564 Financial services – Personal Identification Number (PIN) management and security ISO 9568:1993 Cinematography – Background acoustic noise levels in theatres, review rooms and dubbing rooms ISO/IEC TR 9573:1988 Information processing - SGML support facilities - Techniques for using SGML ISO/IEC TR 9573-11:2004 Part 11: Structure descriptions and style specifications for standards document interchange ISO/IEC TR 9573-13:1991 Part 13: Public entity sets for mathematics and science ISO/IEC 9574:1992 Information technology – Provision of the OSI connection-mode network service by packet mode terminal equipment to an integrated services digital network (ISDN) ISO/IEC TR 9575:1995 Information technology – Telecommunications and information exchange between systems – OSI Routeing Framework ISO/IEC 9576 Information technology – Open Systems Interconnection – Connectionless Presentation protocol ISO/IEC 9576-1:1995 Protocol specification ISO/IEC 9576-2:1995 Protocol Implementation Conformance Statement (PICS) proforma ISO/IEC TR 9577:1999 Information technology – Protocol identification in the network layer ISO/IEC TR 9578:1990 Information technology – Communication interface connectors used in local area networks ISO/IEC 9579:2000 Information technology – Remote database access for SQL with security enhancement ISO 9583:1993 Implants for surgery – Non-destructive testing – Liquid penetrant inspection of metallic surgical implants ISO 9584:1993 Implants for surgery – Non-destructive testing – Radiographic examination of cast metallic surgical implants ISO 9585:1990 Implants for surgery – Determination of bending strength and stiffness of bone plates ISO/IEC 9592 Information technology – Computer graphics and image processing – Programmer's Hierarchical Interactive Graphics System (PHIGS) ISO/IEC 9593 Information technology – Computer graphics – Programmer's Hierarchical Interactive Graphics System (PHIGS) language bindings ISO/IEC 9594 Information technology – Open Systems Interconnection – The Directory ISO/IEC 9594-1:2017 Part 1: Overview of concepts, models and services ISO/IEC 9594-2:2017 Part 2: Models ISO/IEC 9594-3:2017 Part 3: Abstract service definition ISO/IEC 9594-4:2017 Part 4: Procedures for distributed operation ISO/IEC 9594-5:2017 Part 5: Protocol specifications ISO/IEC 9594-6:2017 Part 6: Selected attribute types ISO/IEC 9594-7:2017 Part 7: Selected object classes ISO/IEC 9594-8:2017 Part 8: Public-key and attribute certificate frameworks ISO/IEC 9594-9:2017 Part 9: Replication ISO/IEC 9595:1998 Information technology – Open Systems Interconnection – Common management information service ISO/IEC 9596 Information technology – Open Systems Interconnection – Common management information protocol ISO/IEC 9596-1:1998 Part 1: Specification ISO/IEC 9596-2:1993 Protocol Implementation Conformance Statement (PICS) proforma ISO 9611:1996 Acoustics – Characterization of sources of structure-borne sound with respect to sound radiation from connected structures – Measurement of velocity at the contact points of machinery when resiliently mounted ISO 9613 Acoustics – Attenuation of sound during propagation outdoors ISO 9613-1:1993 Part 1: Calculation of the absorption of sound by the atmosphere ISO 9613-2:1996 Part 2: General method of calculation ISO 9614 Acoustics – Determination of sound power levels of noise sources using sound intensity ISO 9614-1:1993 Part 1: Measurement at discrete points ISO 9614-2:1996 Part 2: Measurement by scanning ISO 9614-3:2002 Part 3: Precision method for measurement by scanning ISO 9626:2016 Stainless steel needle tubing for the manufacture of medical devices – Requirements and test methods ISO/IEC 9636 Information technology - Computer graphics - Interfacing techniques for dialogues with graphical devices (CGI) - Functional specification ISO/IEC 9636-1:1991 Part 1: Overview, profiles, and conformance ISO/IEC 9636-2:1991 Part 2: Control ISO/IEC 9636-3:1991 Part 3: Output ISO/IEC 9636-4:1991 Part 4: Segments ISO/IEC 9636-5:1991 Part 5: Input and echoing ISO/IEC 9636-6:1991 Part 6: Raster ISO/IEC 9637 Information technology - Computer graphics - Interfacing techniques for dialogues with graphical devices (CGI) – Data stream binding ISO/IEC 9637-1:1994 Part 1: Character encoding ISO/IEC 9637-2:1992 Part 2: Binary encoding ISO/IEC 9638 Information technology - Computer graphics - Interfacing techniques for dialogues with graphical devices (CGI) - Language bindings ISO/IEC 9638-3:1994 Part 3: Ada ISO 9645:1990 Acoustics – Measurement of noise emitted by two-wheeled mopeds in motion – Engineering method ISO/IEC 9646 Information technology—Open Systems Interconnection—Conformance testing methodology and framework ISO/IEC 9646-1:1994 Part 1: General concepts ISO/IEC 9646-2:1994 Part 2: Abstract Test Suite specification ISO/IEC 9646-3:1998 Part 3: The Tree and Tabular Combined Notation (TTCN) ISO/IEC 9646-4:1994 Part 4: Test realization ISO/IEC 9646-5:1994 Part 5: Requirements on test laboratories and clients for the conformance assessment process ISO/IEC 9646-6:1994 Part 6: Protocol profile test specification ISO/IEC 9646-7:1995 Part 7: Implementation Conformance Statements ISO 9660:1988 Information processing – Volume and file structure of CD-ROM for information interchange ISO/IEC 9661:1994 Information technology – Data interchange on 12,7 mm wide magnetic tape cartridges – 18 tracks, 1 491 data bytes per millimetre ISO 9662:1994 Aircraft equipment - Environmental and operating conditions for airborne equipment - Humidity, temperature and pressure tests ISO 9668:1990 Pulps — Determination of magnesium content — Flame atomic absorption spectrometric method [Withdrawn: replaced with ISO 12830] ISO 9687:2015 Dentistry - Graphical symbols for dental equipment ISO 9688:1990 Mechanical vibration and shock – Analytical methods of assessing shock resistance of mechanical systems – Information exchange between suppliers and users of analyses ISO 9696:2007 Water quality - Measurement of gross alpha activity in non-saline water - Thick source method ISO 9706:1994 Information and documentation – Paper for documents – Requirements for permanence ISO 9707:2008 Information and documentation - Statistics on the production and distribution of books, newspapers, periodicals and electronic publications ISO 9712:2012 Non-destructive testing - Qualification and certification of NDT personnel ISO 9713:2002 Neurosurgical implants – Self-closing intracranial aneurysm clips ISO 9714 Orthopaedic drilling instruments ISO 9714-1:2012 Part 1: Drill bits, taps and countersink cutters ISO 9735:1988 Electronic data interchange for administration, commerce and transport (EDIFACT) – Application level syntax rules (Syntax version number: 4, Syntax release number: 2) ISO 9735-1:2002 Part 1: Syntax rules common to all parts ISO 9735-2:2002 Part 2: Syntax rules specific to batch EDI ISO 9735-3:2002 Part 3: Syntax rules specific to interactive EDI ISO 9735-4:2002 Part 4: Syntax and service report message for batch EDI (message type – CONTRL) ISO 9735-5:2002 Part 5: Security rules for batch EDI (authenticity, integrity and non-repudiation of origin) ISO 9735-6:2002 Part 6: Secure authentication and acknowledgement message (message type – AUTACK) ISO 9735-7:2002 Part 7: Security rules for batch EDI (confidentiality) ISO 9735-8:2002 Part 8: Associated data in EDI ISO 9735-9:2002 Part 9: Security key and certificate management message (message type – KEYMAN) ISO 9735-10:2014 Part 10: Syntax service directories ISO/IEC 9796 Information technology – Security techniques – Digital signature schemes giving message recovery ISO/IEC 9796-2:2010 Part 2: Integer factorization based mechanisms ISO/IEC 9796-3:2006 Part 3: Discrete logarithm based mechanisms ISO/IEC 9797 Information technology – Security techniques – Message Authentication Codes (MACs) ISO/IEC 9797-1:2011 Part 1: Mechanisms using a block cipher ISO/IEC 9797-2:2011 Part 2: Mechanisms using a dedicated hash-function ISO/IEC 9797-3:2011 Part 3: Mechanisms using a universal hash-function ISO/IEC 9798 Information technology – Security techniques – Entity authentication ISO/IEC 9798-1:2010 Part 1: General ISO/IEC 9798-2:2008 Part 2: Mechanisms using symmetric encipherment algorithms ISO/IEC 9798-3:1998 Part 3: Mechanisms using digital signature ISO/IEC 9798-4:1999 Part 4: Mechanisms using a cryptographic check function ISO/IEC 9798-5:2009 Part 5: Mechanisms using zero-knowledge techniques ISO/IEC 9798-6:2010 Part 6: Mechanisms using manual data transfer ISO 9801:2009 Ophthalmic instruments – Trial case lenses ISO 9802:1996 Raw optical glass – Vocabulary ISO/IEC 9804:1998 Information technology – Open Systems Interconnection – Service definition for the Commitment, Concurrency and Recovery service element ISO/IEC 9805 Information technology – Open Systems Interconnection – Protocol for the Commitment, Concurrency and Recovery service element ISO/IEC 9805-1:1998 Protocol specification ISO/IEC 9805-2:1996 Protocol Implementation Conformance Statement (PICS) proforma ISO/TR 9824:2007 Hydrometry – Measurement of free surface flow in closed conduits ISO 9825:2005 Hydrometry – Field measurement of discharge in large rivers and rivers in flood ISO 9826:1992 Measurement of liquid flow in open channels – Parshall and SANIIRI flumes ISO 9827:1994 Measurement of liquid flow in open channels by weirs and flumes – Streamlined triangular profile weirs ISO/IEC 9834 Information technology – Open Systems Interconnection – Procedures for the operation of OSI Registration Authorities ISO/IEC 9834-1:2012 General procedures and top arcs of the international object identifier tree ISO/IEC 9834-2:1993 Part 2: Registration procedures for OSI document types ISO/IEC 9834-3:2008 Registration of Object Identifier arcs beneath the top-level arc jointly administered by ISO and ITU-T ISO/IEC 9834-4:1991 Part 4: Register of VTE Profiles ISO/IEC 9834-5:1991 Part 5: Register of VT Control Object Definitions ISO/IEC 9834-6:2005 Registration of application processes and application entities ISO/IEC 9834-7:2008 Joint ISO and ITU-T Registration of International Organizations ISO/IEC 9834-8:2014 Part 8: Generation of universally unique identifiers (UUIDs) and their use in object identifiers ISO/IEC 9834-9:2008 Registration of object identifier arcs for applications and services using tag-based identification ISO 9846 Solar energy -- Calibration of a pyranometer using a pyrheliometer ISO 9847 Solar energy -- Calibration of field pyranometers by comparison to a reference pyranometer ISO 9849:2017 Optics and optical instruments - Geodetic and surveying instruments - Vocabulary ISO 9851:1990 Continuous mechanical handling equipment – Overhead electrical monorail conveyors – Definitions and safety rules ISO 9869 Thermal insulation – Building elements – In-situ measurements of thermal resistance and thermal transmittance ISO 9873:2017 Dentistry - Intra-oral mirrors ISO 9878:1990 Micrographics - Graphical symbols for use in microfilming ISO 9897:1997 Freight containers - Container equipment data exchange (CEDEX) - General communication codes ISO/IEC 9899:2018 Programming languages – C ISO 9902 Textile machinery – Noise test code ISO 9902-1:2001 Part 1: Common requirements ISO 9902-2:2001 Part 2: Spinning preparatory and spinning machinery ISO 9902-3:2001 Part 3: Nonwoven machinery ISO 9902-4:2001 Part 4: Yarn processing, cordage and rope manufacturing machinery ISO 9902-5:2001 Part 5: Weaving and knitting preparatory machinery ISO 9902-6:2001 Part 6: Fabric manufacturing machinery ISO 9902-7:2001 Part 7: Dyeing and finishing machinery ISO 9926 Cranes – Training of operators ISO 9926-1:1990 Part 1: General ISO 9926-3:2016 Part 3: Tower cranes ISO/IEC/IEEE 9945:2009 Information technology – Portable Operating System Interface (POSIX®) Base Specifications, Issue 7 ISO 9947:2005 Textile machinery and accessories – Two-for-one twisters – Vocabulary ISO 9949 Urine absorbing aids - Vocabulary ISO 9949-1:1993 Part 1: Conditions of urinary incontinence ISO 9949-2:1993 Part 2: Products ISO 9949-3:1993 Part 3: Identification of product types ISO 9951:1993 Measurement of gas flow in closed conduits – Turbine meters ISO 9957 Fluid draughting media ISO 9957-1:1992 Part 1: Water-based India ink – Requirements and test conditions ISO 9957-2:1995 Part 2: Water-based non-India ink – Requirements and test conditions ISO 9957-3:1997 Part 3: Water-based coloured draughting inks – Requirements and test conditions ISO 9958 Draughting media for technical drawings – Draughting film with polyester base ISO 9958-1:1992 Part 1: Requirements and marking ISO 9958-2:1992 Part 2: Determination of properties ISO 9959 Numerically controlled draughting machines – Drawing test for the evaluation of performance ISO 9959-1:1992 Part 1: Vector plotters ISO 9960 Draughting instruments with or without graduation ISO 9960-1:1992 Part 1: Draughting scale rules ISO 9961:1992 Draughting media for technical drawings – Natural tracing paper ISO 9962 Manually operated draughting machines ISO 9962-1:1992 Part 1: Definitions, classification and designation ISO 9962-2:1992 Part 2: Characteristics, performance, inspection and marking ISO/IEC 9973:2013 Information technology - Computer graphics, image processing and environmental data representation - Procedures for registration of items ISO 9984:1996 Information and documentation – Transliteration of Georgian characters into Latin characters ISO 9985:1996 Information and documentation – Transliteration of Armenian characters into Latin characters ISO 9992 Financial transaction cards – Messages between the integrated circuit card and the card accepting device ISO/IEC 9995 Information technology – Keyboard layouts for text and office systems ISO 9997:1999 Dental cartridge syringes ISO 9999 Assistive products for persons with disability – Classification and terminology
== See also == Isotope List of elements by stability of isotopes List of nuclides (sorted by half-life) Table of nuclides Alpha nuclide Monoisotopic element Mononuclidic element Primordial element Radionuclide Hypernucleus
=== Microbial === Some molds such as Rhizomucor miehei are able to produce proteolytic enzymes. These molds are produced in a fermenter and then specially concentrated and purified to avoid contamination with unpleasant byproducts of the mold growth. The traditional view is that these coagulants result in bitterness and low yield in cheese, especially when aged for a long time. In modern times, microbial coagulants have improved greatly, largely due to the characterization and purification of secondary enzymes responsible for bitter peptide formation/non-specific proteolytic breakdown in cheese aged for long periods. Consequently, it has become possible to produce several high-quality cheeses with microbial rennet. It is also suitable for the elaboration of vegetarian cheese, provided no animal-based ingredients are used in its production.
William Clark Still (born 1946) is an American organic chemist. As a distinguished professor at Columbia University, Clark Still made significant contributions to the field of organic chemistry, particularly in the areas of natural product synthesis, reaction development, conformational analysis, macrocyclic stereocontrol, and computational chemistry. Still and coworkers also developed the purification technique known as flash column chromatography, which is widely used for the purification of organic compounds.
Enzyme kinetics is the scientific study of chemical reactions caused by enzyme catalysis, and a subfield of biochemistry. It is concerned with the reaction rate of chemical reactions, their effects, and the varying conditions that cause the reactions. Studying an enzyme's kinetics in this way can reveal the catalytic reaction mechanism of this enzyme, its role in metabolism, how its activity is controlled, and how a drug or a modifier (inhibitor or activator) might affect the rate. An enzyme, often written "E" in reactions, is a protein molecule that serves as a biological catalyst to facilitate and accelerate a chemical reaction in a cell or other biological environment. It does this through binding of one or more other molecules, its substrate (S), which the enzyme acts upon to form the desired product. The substrate binds to the active site of the enzyme to produce an enzyme-substrate complex (ES), and is transformed into an enzyme-product complex (EP) and from there to the product or products (P), via a transition state (ES*). That series of steps is known as the mechanism:
Sources: en.wikipedia.org
=== Replacement === From 2008, operations have experimentally replaced tracheas, with those grown from stem cells, or with synthetic substitutes, however this is regarded as experimental and there is no standardised method. Difficulties with ensuring adequate blood supply to the replaced trachea is considered a major challenge to any replacement. Additionally, no evidence has been found to support the placement of stem cells taken from bone marrow on the trachea as a way of stimulating tissue regeneration, and such a method remains hypothetical. In January 2021, surgeons at Mount Sinai Hospital in New York performed the first complete trachea transplantation. The 18-hour procedure included harvesting a trachea from a donor and implanting it in the patient, connecting numerous veins and arteries to provide sufficient blood flow to the organ.
== Application == As different proteins have different compositions of amino acids, different protein molecules precipitate at different concentrations of salt solution. Unwanted proteins can be removed from a protein solution mixture by salting out as long as the solubility of the protein in various concentrations of salt solution is known. After removing the precipitate by filtration or centrifugation, the desired protein can be precipitated by altering the salt concentration to the level at which the desired protein becomes insoluble. One demerit of salting out in purification of proteins is that, in addition to precipitating a specific protein of interest, contaminants are also precipitated as well. Thus to obtain a purer protein of interest, additional purification methods such as ion exchange chromatography may be required.
The micellar theory of Carl Nägeli was developed from his detailed study of starch granules in 1858. Amorphous substances such as starch and cellulose were proposed to consist of building blocks, packed in a loosely crystalline array to form what he later termed "micelles". Water could penetrate between the micelles, and new micelles could form in the interstices between old micelles. The swelling of starch grains and their growth was described by a molecular-aggregate model, which he also applied to the cellulose of the plant cell wall. The modern usage of 'micelle' refers strictly to lipids, but its original usage clearly extended to other types of biomolecule, and this legacy is reflected to this day in the description of milk as being composed of 'casein micelles'.
Lyon, Davor Solter and Azim Surani, for their pioneering work on epigenetic gene regulation in mammalian embryos 2005 Martin Chalfie and Roger Y. Tsien, for their pioneering development of powerful new tools that allow the direct visualization of molecules in living cells 2004 Andrew Z. Fire, Craig C. Mello, Victor Ambros and Gary Ruvkun, for their pioneering achievements in the discovery of gene silencing by double-stranded RNA 2003 Masakazu Konishi, Peter Marler and Fernando Nottebohm, for their pioneering achievements in the ethology and neurology of birdsong 2002 Ira Herskowitz, for his pioneering achievements in yeast genetics and cell biology 2001 Joan A. Steitz, for her work in establishing a sub-field of molecular biology concerning small nuclear ribonucleoproteins 2000 Peter B. Moore, Harry F. Noller, Jr. and Thomas A. Steitz, for their discovery that peptide bond formation on the ribosome is catalyzed exclusively by ribosomal RNA 1999 Roderick MacKinnon, for his research into the molecular foundations of electrical signal generation in neurons and other types of cells 1998 Elizabeth Blackburn and Carol Greider, for their outstanding work on the maintenance of telomeres 1997 H. Robert Horvitz and John E. Sulston, for their pioneering studies of cell lineage in the nematode worm 1996 Richard Axel, Linda B. Buck and A. James Hudspeth, for establishing the molecular basis of the senses of smell and hearing 1995 Thomas D. Pollard and James A. Spudich, for their fundamental contributions to our understanding of molecular motors 1994 Robert G.
Sources: en.wikipedia.org
=== Indonesia === The Just and Prosperous People's Party of the Advanced Indonesia Coalition condemned the U.S. strikes in Venezuela and denounced it as "vulgar aggression". The National Awakening Party of the Advanced Indonesia Coalition, through its faction in the House of Representatives condemned the U.S. strikes and accused Donald Trump of using the "law of the jungle" which can be set by other advanced, developed powers to force developing states into capitulation, leading to "modern-era imperialism and colonization". The Prosperous Justice Party through its faction in the House of Representatives condemned the U.S. strikes as an illegal act against the legitimate Venezuelan government and warned that this can set a precedence for future illegal acts committed by a powerful ruling government of a state against the government of their rival states or neighboring states.
Medication (also called medicament, medicine, pharmaceutical drug, medicinal product, medicinal drug, or simply drug) is a drug used to diagnose, cure, treat, or prevent disease. Drug therapy (pharmacotherapy) is an important part of the medical field and relies on the science of pharmacology for continual advancement and on pharmacy for appropriate management. Drugs are classified in many ways. One of the key divisions is by level of control, which distinguishes prescription drugs (those that a pharmacist dispenses only on the medical prescription) from over-the-counter drugs (those that consumers can order for themselves). Medicines may be classified by mode of action, route of administration, biological system affected, or therapeutic effects. The World Health Organization keeps a list of essential medicines. Drug discovery and drug development are complex and expensive endeavors undertaken by pharmaceutical companies, academic scientists, and governments. As a result of this complex path from discovery to commercialization, partnering has become a standard practice for advancing drug candidates through development pipelines. Governments generally regulate what drugs can be marketed, how drugs are marketed, and in some jurisdictions, drug pricing. Controversies have arisen over drug pricing and disposal of used medications.
Entry clones must be made using the supplied "Donor" vectors containing a Gateway cassette flanked by attP sites. The Gateway cassette contains a bacterial suicide gene (e.g. ccdB) that will allow for survival and selection of successfully recombined entry clones. A pair of attB sites are added to flank the DNA fragment of interest, and this will allow recombination with the attP sites when the BP clonase mix is added. Entry clones are produced, and the fragment of interest is flanked by attL sites. The destination vector also comes with a Gateway cassette, but is instead flanked by a pair of attR sites. Mixing this destination plasmid with the entry clones and the LR clonase mix will allow for recombination to occur between the attR and attL sites. A destination clone is produced, with the fragment of interest successfully inserted. The lethal gene is inserted into the original vector, and bacteria transformed with this plasmid will die. The desired vector can thus be easily selected. The earliest iterations of the Gateway cloning method only allowed for only one entry clone to be used for each destination clone produced. However, further research revealed that four more orthogonal att sequences could be generated, allowing for the assembly of up to four different DNA fragments, and this process is now known as the Multisite Gateway technology. Besides Gateway cloning, non-commercial methods using other integrases have also been developed.
10-Methacryloyloxydecyl dihydrogen phosphate (10-MDP, MDP Monomer) is a chemical compound used in dental adhesive materials. This organophosphate monomer was developed in 1981 by the Japanese company Kuraray for the preparation of dental adhesion polymers
A wrinkle, also known as a rhytid, is a fold, ridge or crease in an otherwise smooth surface, such as on skin or fabric. Skin wrinkles typically appear as a result of ageing processes such as glycation, habitual sleeping positions, loss of body mass, sun damage, or temporarily, as the result of prolonged immersion in water. Age wrinkling in the skin is promoted by habitual facial expressions, aging, sun damage, smoking, poor hydration, and various other factors. In humans, it can also be prevented to some degree by avoiding excessive solar exposure and through diet (in particular through consumption of carotenoids, tocopherols and flavonoids, vitamins (A, C, D and E), essential omega-3-fatty acids, certain proteins and lactobacilli).
Sources: en.wikipedia.org
As of the mid-2020s retatrutide remains investigational and is not an approved medicine in the United States or the European Union. It has been supplied mainly to participants in clinical trials. Labels and availability can change, so regulatory listings should be checked directly.
Dual agonists act at the GLP-1 and GIP receptors, whereas retatrutide adds glucagon receptor activity on the same peptide. This third activity is the main structural and pharmacological distinction discussed in the literature. Direct head-to-head comparisons remain limited.
Reports usually give the study code LY3437943 alongside the name, the dose in milligrams, and the week at which an endpoint was measured. Percent body-weight change is the most frequent headline measure. Units and populations vary, so comparisons across reports require care.
Reverse-phase liquid chromatography and mass spectrometry are the most common techniques. Chromatography assesses purity, while mass spectrometry confirms molecular identity. Additional methods may be applied when higher confidence is required.