Everything below concerns Container closure. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Last reviewed on 2026-08-01. Where a claim depends on a specific study, the study is described rather than over-claimed.
Lyophilization removes water by freezing a material and then lowering pressure so ice changes directly to vapor. The process relies on sublimation, the phase transition from solid to gas without an intermediate liquid state. Because the material remains frozen during primary drying, the structure often stays porous. This porous matrix can rehydrate quickly when water is added back. The low pressure also allows vapor to leave the solid matrix without boiling.
A typical cycle begins with freezing, which fixes the material into a solid and determines ice crystal size. Primary drying then raises heat under vacuum so ice sublimes, often near or below the collapse temperature of the formulation. Secondary drying removes bound water that remains after ice is gone, usually by gently warming the product. Each stage balances heat input against pressure to avoid melting or structural damage. Temperature probes and pressure sensors guide the transition between stages.
Stability of a lyophilized product depends on its glass transition temperature, the temperature at which the amorphous cake transitions from a glassy to a rubbery state. Storage below this temperature minimizes molecular mobility and slows chemical degradation. If the storage temperature exceeds the glass transition temperature, the cake may collapse, shrink, or become sticky. Accelerated stability studies at elevated temperatures and humidity help predict shelf life, but they do not always reflect real-time behavior. Residual moisture content also plays a critical role in long-term stability.
Reconstitution involves adding a suitable diluent, often sterile water or a buffer, to the dried cake. Gentle swirling or inversion helps dissolve the material without creating excessive foam. The time required for complete dissolution can range from seconds to several minutes and depends on the cake structure and the diluent. Improper reconstitution, such as vigorous shaking or using the wrong diluent, can cause protein aggregation or loss of activity. After reconstitution, the product may have a limited shelf life and should be used according to its labeling.
Lyophilized products are typically hygroscopic and require protection from moisture during storage. Manufacturers seal them in glass vials, often under vacuum or an inert gas such as nitrogen. The container closure system, including the stopper and crimp seal, must prevent water vapor ingress. Storage temperature varies from controlled room temperature to refrigerated or frozen conditions, depending on the formulation. Humidity-controlled environments are essential because even brief exposure to ambient air can degrade the product.
| Property | Value | Notes |
|---|---|---|
| Common synonym | Freeze-drying | Same dehydration operation |
| Typical vacuum | 10-100 Pa | Pressure during primary drying |
| Primary drying temperature | -40 to -10 °C | Below collapse temperature for many formulations |
| Cycle duration | 12-72 hours | Varies with load, container, and formulation |
| Key phase change | Sublimation | Solid ice to water vapor |
The physics of lyophilization couples heat transfer, mass transfer, and phase behavior. Sublimation requires a vapor pressure difference between the ice front and the chamber, and the dried layer adds resistance to vapor flow. Amorphous formulations are characterized by a glass transition temperature of the maximally freeze-concentrated solute, often denoted Tg'. Crystalline bulking agents can provide structure, while amorphous excipients stabilize labile components. Open questions remain about spatial heterogeneity, edge effects, and how laboratory cycles scale to production.
Lyophilization is a drying process in which a solvent, usually water, is removed from a frozen material by sublimation under reduced pressure. The material is first solidified, then placed under vacuum so that ice transitions directly to vapor without a bulk liquid phase. This approach suits heat-sensitive substances that would degrade during conventional evaporation. Primary drying removes unbound ice, while secondary drying reduces water that remains adsorbed to the solid matrix. The result is a porous, lightweight solid that can be reconstituted later.
A typical cycle begins with freezing, sometimes including an annealing step to control ice crystal size. Freezing conditions influence the pore network that later allows vapor escape. During primary drying, shelf temperature and chamber pressure are set so heat enters the product while its temperature stays below the collapse or eutectic point. Secondary drying then raises the shelf temperature to desorb bound water and lower residual moisture. Cycle design depends on formulation, fill volume, container type, and equipment capability.
Quality assessment of a lyophilized product includes cake appearance, residual moisture, reconstitution time, and container closure integrity. A uniform, porous cake suggests that freezing and drying stayed within the formulation's design space. Cracks, shrinkage, meltback, or a glassy film can indicate thermal abuse or a formulation problem. Analysts also test for subvisible particles and sterility when the product requires those specifications. Visual inspection alone cannot confirm biological activity or chemical stability, so it is combined with analytical methods.
Stability programs monitor lyophilized products under defined temperature and humidity conditions over time. Real-time studies at recommended storage conditions are the reference, while accelerated studies provide early signals of degradation pathways. Because a dry cake can still undergo oxidation, hydrolysis, or aggregation, stability depends on residual moisture, excipients, and container headspace. Open questions include how best to predict long-term stability from short accelerated runs and how vial-to-vial variability affects shelf life. Current guidance treats these predictions as product-specific rather than universally generalizable.
Lyophilization, also called freeze-drying, is a dehydration process in which a solvent, usually water, is frozen and then removed by sublimation under reduced pressure. The method preserves heat-sensitive materials that would degrade in conventional drying. Large-scale use grew during the mid-twentieth century for blood plasma and antibiotics, and it later expanded to vaccines, enzymes, foods, and advanced materials. The process produces a dry, porous solid that usually reconstitutes rapidly. It is distinct from simple evaporation because the solvent bypasses the liquid phase during primary removal.
The process generally proceeds in three stages: freezing, primary drying, and secondary drying. During freezing, controlled cooling converts water into ice and may also crystallize or vitrify solutes. In primary drying, the pressure is lowered below the triple point, and heat is supplied so ice sublimes directly to vapor. Secondary drying removes water that remains bound to the solid matrix, yielding a low final water content. Product temperature must stay below the collapse or glass transition temperature to maintain structure. Cycle design therefore balances shelf temperature, chamber pressure, and time.
Residual moisture is a key quality attribute for lyophilized products. Water that remains after secondary drying can affect chemical stability, cake structure, and shelf life. Karl Fischer titration is a common method for measuring water content in the dried solid. The target range varies by product, but many biologics are dried to between 0.5% and 3% water by weight. Acceptable limits are set during development and confirmed by stability studies.
Stability studies examine how temperature, humidity, and time influence a lyophilized product. Accelerated conditions provide early information about degradation pathways, while long-term studies support shelf-life claims. The glass transition temperature of the dried formulation can indicate its physical stability, and storage above this temperature may increase molecular mobility and lead to collapse or aggregation. Container closure integrity also matters because moisture or oxygen ingress can degrade the product, so vial stoppers and seals are part of the quality system.
Handling and storage practices aim to keep the cake intact and dry. Vials are typically stored upright at controlled temperatures, often between 2 °C and 8 °C or at -20 °C for longer-term use. Reconstitution involves adding a suitable diluent and gently mixing until the solid dissolves. Shaking or rapid injection of diluent can create foam or damage sensitive molecules. Once reconstituted, the product may require refrigeration and use within a defined period.
== Other versions == An alternate universe version of Mogo who became home to a Xenomorph colony appears in Green Lantern Versus Aliens. An alternate universe version of Mogo appears in Absolute Green Lantern. This version is a leading member of the Blackstars.
=== Skeletal muscle === In 1998, skeletal muscle was identified as an endocrine organ due to its now well-established role in the secretion of myokines. The use of the term myokine to describe cytokines and other peptides produced by muscle as signalling molecules was proposed in 2003.
There is also substantial evidence that TGF-β-dependent signaling via the SMAD-3 pathway is responsible for many of the inhibitory functions of TGF-β discussed in later sections and thus it is implicated in oncogenesis. The Smads are not the only TGF-β-regulated signaling pathways. Non-Smad signaling proteins can initiate parallel signaling that eventually cooperate with the Smads or crosstalk with other major signaling pathways. Among them, the mitogen-activated protein kinase (MAPK) family that include the extracellular-regulated kinases (ERK1 and 2), Jun N-terminal kinases (JNKs) and p38 MAPK play an important role in the TGF-β signaling. ERK 1 and 2 are activated via the Raf-Ras-MEK1/2 pathway induced by mitogenic stimuli such as epidermal growth factor, whereas the JNK and p38 MAPK are activated by the MAPK kinase, activated themselves by the TGF-β-activated kinase-1 (TAK1) upon stress stimuli.
== Arthropathies and related disorders (710–719) == 710 Diffuse diseases of connective tissue 710.0 Systemic lupus erythematosus 710.2 Sjögren's syndrome 710.3 Dermatomyositis 710.4 Polymyositis 710.5 Eosinophilia myalgia syndrome 710.9 Connective tissue disease, unspec. 711 Arthropathy associated with infections 712 Crystal arthropathies 712.1 Chondrocalcinosis due to dicalcium phosphate crystals 712.2 Chondrocalcinosis due to pyrophosphate crystals 712.3 Chondrocalcinosis, cause unspecified pseudogout 712.8 Other specified crystal arthropathies 712.9 Unspecified crystal arthropathy 713 Arthropathy, endocrine disorders 713.1 Arthropathy, gastrointestinal conditions 714 Rheumatoid arthritis and other inflammatory polyarthropathies 714.0 Rheumatoid arthritis 714.3 Polyarticular juvenile rheumatoid arthritis 715 Osteoarthrosis and allied disorders 715.09 Osteoarthrosis, generalized, multiple sites 715.11 Osteoarthrosis, shoulder 715.14 Osteoarthrosis, hand 715.15 Osteoarthrosis, hip 715.16 Osteoarthrosis, knee 715.17 Osteoarthrosis, ankle/foot 715.9 Osteoarthrosis, unspec. 716 Other and unspecified arthropathies 716.1 Arthropathy, traumatic, unspec. 716.9 Arthropathy, unspec. 717 Internal derangement of knee 717.1 Derangement of anterior horn of medial meniscus 717.42 Derangement of lateral meniscus 717.7 Chondromalacia of patella 717.9 Derangement, internal, knee, unspec.
Sources: en.wikipedia.org
This production has been described as also producing "melamine scrap" which is not "pure melamine but impure melamine scrap that is sold more cheaply as the waste product after melamine is produced by chemical and fertilizer factories here." Shandong Mingshui Great Chemical Group, the company reported by The New York Times as producing melamine from coal, produces and sells both urea and melamine but does not list melamine resin as a product. Melamine production in China has increased greatly in recent years and was described as in "serious surplus" in 2006. In the United States Geological Survey 2004 Minerals Survey Yearbook, in a report on worldwide nitrogen production, the author stated that "China continued to plan and construct new ammonia and urea plants using coal gasification technology." The off-gas in production contains large amounts of ammonia (see melamine synthesis). Therefore, melamine production is often integrated into urea production which uses ammonia as feedstock. Crystallization and washing of melamine generates a considerable amount of waste water, which is a pollutant if discharged directly into the environment. The waste water may be concentrated into a solid (1.5-5% of the weight) for easier disposal. The solid may contain approximately 70% melamine, 23% oxytriazines (ammeline, ammelide and cyanuric acid), 0.7% polycondensates (melem, melam and melon). In January 2009, China's Ministry of Industry and Information Technology promulgated draft production permit rules aiming to stem a melamine production glut.
In anatomy, the epidural space is the potential space between the dura mater and vertebrae (spine). The anatomy term "epidural space" has its origin in the Ancient Greek language; ἐπί, "on, upon" + dura mater also known as "epidural cavity", "extradural space" or "peridural space". In humans the epidural space contains lymphatics, spinal nerve roots, loose connective tissue, adipose tissue, small arteries, dural venous sinuses and a network of internal vertebral venous plexuses.
== Indications and Usage == In 1997, the United States Food and Drug Administration approved difloxacin hydrochloride tablets for use in canines. Unlike other fluoroquinolones difloxacin has not been approved by the FDA for use in cats. It is also contraindicated for use in food animals. The recommended dosing is 5–10 mg/kg once daily. This is based on the linear pharmacokinetics exhibited by difloxacin over the 5–60 mg/kg range. So the maximum dose is well within the established safety range, but drug accumulation in tissues prompts a recommendation that the medication should not be used for periods longer than thirty days. If there is no noticeable improvement after five days, then the condition should be reevaluated and all therapy options reconsidered. Difloxacin is indicated for infections caused by susceptible microorganisms in the conditions listed below.
==== Signs of a good, deep latch ==== In a good latch, a large amount of the areola, in addition to the nipple, is in the baby's mouth. The amount of areola visible on either side of the infant's mouth should be asymmetric, meaning most of the "bottom" of the areola should be in the infant's mouth, and much more of the "top" of the areola should be visible. This position helps point the nipple toward the roof of the infant's mouth, helping the infant recruit more milk. The baby's lips should be flanged out. The neck should be extended to facilitate swallowing, and as such, the chin will be close to the breast, and the forehead and nose should be far from the breast. Another sign of a good latch is the contour of the infant's cheeks; the cheeks should be rounded all the way to the edge of the mouth, rather than dimpled or creased at the edge of the mouth. This is a good indicator of effective suck mechanics. Additionally, to achieve a deep latch, the infant's mouth must be open wide, preferably wider than 140 degrees.
In April 2007, Dein left Arsenal due to "irreconcilable differences" about the future of the club. Wenger described it as a "sad day for Arsenal," and sought assurances from the board over his future as well as reasons for Dein's departure. The instability at board level influenced club captain Henry's decision to leave Arsenal in June 2007, which led to uncertainty over Wenger's position. In September 2007, Wenger signed a new three-year extension, stating that he remained committed to "the club of my life." (In 2021, Wenger revealed that his signing of the contract extension was his side of a deal with the Arsenal board in the building of the new stadium, because he requested its construction.) Arsenal flourished in Henry's absence, with Emmanuel Adebayor, Mathieu Flamini and Fàbregas playing a more prominent role in the 2007–08 season. Defeat to Middlesbrough in December 2007 ended a run of 22 league matches unbeaten, but Arsenal soon built a five-point lead over Manchester United. A career-threatening injury to striker Eduardo against Birmingham City on 23 February 2008 acted as a turning point in Arsenal's season. Wenger, incensed at the aggressive tactics of opponents, called for a ban on tackler Martin Taylor in his post-match interview; he later retracted the comment. Arsenal's form subsequently suffered, and a run of three consecutive draws in March allowed Manchester United and Chelsea to overhaul them as they finished the season in third. Arsenal made a troubled start to Wenger's twelfth season.
Sources: en.wikipedia.org
==== Ukraine ==== During the Biden administration and the start of the Russian invasion of Ukraine, there were initially significant tensions regarding India's ties with Russia. However, the second Trump administration is anticipated to seek a quick end to the conflict, likely reducing India's distance from the United States on European security issues.
Type I : Extra-dural; no nerve roots or rootlets such as intra-sacral meningoceles; probably of congenital origin developing from the dural sac to which they are connected by a little collar. They are found at the point of exit of a dorsal nerve root from the dural sac. They are sometimes difficult to identify and can be "seen" as a type II cyst on imaging. These cysts are often associated with foramina enlargement and scalloping of the vertebrae. It is very important to distinguish them from sacral meningoceles going to the pelvic area; they are often associated with other congenital abnormalities (teratomes, dermoïdes, lipomas, and other abnormalities(uro-genital and ano-rectal)) Type II: Extra-dural; nerve root present (such as Tarlov or perineural cysts). There are often not only one but multiple cysts, mostly found in the sacrum area. There are two types: Tarlov (perineural) cysts are located posteriorly to the root ganglion, with nerve fibres inside or nerve tissue in the walls; they are not communicating with the perineural arachnoid space. Type-II cysts are very small in the upper sacral area, but can be bigger (up to 3 centimetres or 1.2 inches) if found located in the lower part of the sacrum. The second variant of type-II cysts are called "meningeal diverticula". They are located anteriorly to the nerve root ganglion, with nerves fibres inside and communicating with the subarachnoid space. Type III: intra-dural; these are either congenital or caused by trauma; they are rarely associated with other abnormalities and rare in occurrence.
Activation loop Autophosphorylation Ca2+/calmodulin-dependent protein kinase Cell signaling Cyclin-dependent kinase G protein-coupled receptor NDR kinase Nucleoside-diphosphate kinase Phosphatase Phosphatidylinositol phosphate kinases Phospholipid Phosphoprotein Phosphorylation Phosphotransferase Signal transduction Thymidine kinase Thymidine kinase in clinical chemistry Thymidylate kinase Wall-associated kinase
Accelerator mass spectrometry (AMS) is a form of mass spectrometry that accelerates ions to extraordinarily high kinetic energies before mass analysis. The special strength of AMS among the different methods of mass spectrometry is its ability to separate a rare isotope from an abundant neighboring mass ("abundance sensitivity", e.g. 14C from 12C). The method suppresses molecular isobars completely and in many cases can also separate atomic isobars (e.g. 14N from 14C). This makes possible the detection of naturally occurring, long-lived radio-isotopes such as 10Be, 36Cl, 26Al and 14C. (Their typical isotopic abundance ranges from 10−12 to 10−18.) AMS can outperform the competing technique of decay counting for all isotopes where the half-life is long enough. Other advantages of AMS include its short measuring time as well as its ability to detect atoms in extremely small samples.
Sources: en.wikipedia.org
Primary drying removes ice by sublimation under vacuum. Secondary drying removes water that is bound to the material, often by warming the product after most ice has left. Both stages occur below temperatures that would cause unwanted melting.
Sublimation requires the solvent to remain solid so vapor leaves without passing through a liquid phase. If the product melts, the porous structure can collapse and drying becomes uneven. Maintaining frozen conditions preserves the intended physical form.
No, freeze-drying is a dehydration method, not a sterilization step. It can reduce water activity and limit microbial growth during storage, but it does not reliably kill microbes or remove endotoxins. Sterility must come from separate validated processes.
Lyophilized products should be stored in airtight containers, protected from moisture and light, at the temperature specified by the manufacturer. Many require refrigeration at 2–8 °C, while some need frozen storage. Always check the product label for specific conditions.