Everything below concerns sublimation. We keep the language plain, cite what the science says, and separate well-supported claims from open questions.
Updated 2025-10-22. Numbers and descriptions here follow the published literature rather than marketing material.
Quality control for freeze-dried forms includes visual inspection, water content measurement, and reconstitution time. A satisfactory cake is typically uniform, porous, and intact, although minor shrinkage or cracking may be acceptable if specifications allow. Karl Fischer titration, thermal gravimetric analysis, and near-infrared spectroscopy are used to measure water content. Reconstitution is assessed by adding a specified diluent and recording the time and ease of dissolution. Microbiological and particulate tests are added when the product is sterile or intended for injection.
Stability of a lyophilized solid depends on water content, temperature, and the physical state of the formulation. Amorphous products may slowly absorb moisture and drop below their glass transition temperature, causing collapse or crystallization. Some proteins and peptides can aggregate even in a dry state, especially when exposed to heat or moisture. Accelerated stability studies at elevated temperature and humidity help estimate shelf life, but real-time data remain the basis for expiration dating.
A formulation often contains excipients that protect the active ingredient during freezing and drying. Bulking agents provide structure, while lyoprotectants stabilize sensitive molecules. The freezing step can produce ice crystals whose size and distribution affect the drying rate, and cycle design includes freezing, annealing, and drying phases. If the product temperature rises above a critical value, the cake may collapse or lose its porous structure. Successful lyophilization therefore depends on the interaction between formulation, equipment, and cycle design.
Lyophilization is a dehydration process that removes water from a frozen material by sublimation under low pressure. The material is first frozen to convert liquid water into ice. Next, the pressure is reduced below the triple point of water so that ice changes directly into vapor without passing through a liquid phase. This step is called primary drying. The result is a porous solid or cake that retains the original shape of the frozen solution.
| Property | Value | Notes |
|---|---|---|
| Appearance | Porous cake or plug | Uniform structure suggests the drying cycle preserved the matrix. |
| Reconstitution time | Usually under 2 minutes | Depends on cake porosity, diluent volume, and excipient composition. |
| Water content range | 0.5–3% w/w | Common specification range; exact limits are product-specific. |
| Headspace oxygen | <1% v/v | Inert gas backfill reduces oxidation of sensitive materials. |
| Storage temperature | 2–8 °C or controlled room temperature | Choice depends on accelerated and real-time stability results. |
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.
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.
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.
In practice, lyophilization is slower and more energy intensive than simple drying. Cycle times can range from hours to several days depending on load, container, and formulation. Amorphous materials may require excipients that help preserve structure during freezing and drying. The method is widely used for biological materials, pharmaceuticals, and foods where heat drying would cause unacceptable change. Open questions remain about scaling cycles between laboratory and production equipment, and this gap affects technology transfer.
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.
After lyophilization, a product's quality depends on residual moisture, cake appearance, and reconstitution time. Residual moisture is often measured by Karl Fischer titration or thermogravimetric analysis. A low moisture content can slow chemical degradation, but overly dry cakes may be brittle or slow to dissolve. Stability studies track these attributes over months under defined temperature and humidity conditions. Batch records link these measurements to specific process runs and help identify trends before a product fails specification.
Storage conditions for dried products usually aim to exclude moisture and oxygen. Vials are sealed under vacuum or with an inert gas, and stoppers must maintain a barrier during transport. Temperature recommendations vary; some materials remain stable at room temperature, while others need refrigeration or frozen storage. Humidity control is critical because dried cakes can absorb water rapidly once a container is opened. Desiccant packs and moisture-barrier bags add further protection during shipping.
Later, the computers identified four additional missiles in the air, all directed towards the Soviet Union. Petrov suspected that the computer system was malfunctioning again, despite having no direct means to confirm this. The Soviet Union's land radar was incapable of detecting missiles beyond the horizon. It was subsequently determined that the false alarms were caused by a rare alignment of sunlight on high-altitude clouds and the satellites' Molniya orbits, an error later corrected by cross-referencing a geostationary satellite. In explaining the factors leading to his decision, Petrov cited his belief and training that any U.S. first strike would be massive, so five missiles seemed an illogical start. In addition, the launch detection system was new and in his view not yet wholly trustworthy, while ground radar had failed to pick up corroborative evidence even after several minutes of the false alarm.
William Champion's brother, John, patented a process in 1758 for calcining zinc sulfide into an oxide usable in the retort process. Prior to this, only calamine could be used to produce zinc. In 1798, Johann Christian Ruberg improved on the smelting process by building the first horizontal retort smelter. Jean-Jacques Daniel Dony built a different kind of horizontal zinc smelter in Belgium that processed even more zinc. Italian doctor Luigi Galvani discovered in 1780 that connecting the spinal cord of a freshly dissected frog to an iron rail attached by a brass hook caused the frog's leg to twitch. He incorrectly thought he had discovered an ability of nerves and muscles to create electricity and called the effect "animal electricity". The galvanic cell and the process of galvanization were both named after Luigi Galvani, and his discoveries paved the way for electrical batteries, galvanization, and cathodic protection. Galvani's friend, Alessandro Volta, continued researching the effect and invented the Voltaic pile in 1800. Volta's pile consisted of a stack of simplified galvanic cells, each being one plate of copper and one of zinc connected by an electrolyte. By stacking these units in series, the Voltaic pile (or "battery") as a whole had a higher voltage, which could be used more easily than single cells. Electricity is produced because the Volta potential between the two metal plates makes electrons flow from the zinc to the copper and corrode the zinc.
== Original restaurant == The first In-N-Out restaurant that opened in 1948 was demolished when Interstate 10 (then US 60/US 70/US 99, the Ramona Freeway, now the San Bernardino Freeway) was built from downtown Los Angeles to the San Gabriel Valley. The freeway runs over the original location. A new restaurant was completed in 1954 near the original Baldwin Park, California, location. It was closed in November 2004 and demolished on April 16, 2011, despite discussions about using it as an In-N-Out museum chronicling the origins and history of the company. In-N-Out built a replacement restaurant on the other side of the freeway next to the original In-N-Out University (opened in 1984). A new In-N-Out University was built on the property. The university building houses the training department, which was moved from Irvine, California. In addition, the company restaurant was moved from In-N-Out's Baldwin Park headquarters to the new lot, which holds the restaurant and university, less than a thousand feet away. In 2014, a replica of the first In-N-Out was built in Baldwin Park.
== SS == ss – (s) Swati language (ISO 639-1 code) SS (s) Sand Storm (METAR Code) (p) Schutzstaffel (German, roughly "Protection Squadron"; Nazi elite Praetorian guard) (i) U.S. Secret Service Spanish Ship Stainless steel Stockholm Skins (s) Submarine (US Navy hull classification) (i) Super Sport Surface-to-Surface (missile) SSA (s) Cargo Submarine (US Navy hull classification) (i) Social Security Administration (U.S.) Statistics South Africa SSB – (a) Single-sideband modulation SSB – (i) Sacramento Sustainable Business SSBN – (s) Nuclear-Powered Ballistic Missile Submarine (US Navy hull classification) SSC (i) Safe, Sane, Consensual (SM phrase) Secondary Somatosensory Cortex Smaller-Scale Contingency U.S. Army Soldiers System Center (Natick, Massachusetts) Superconducting Super Collider SSCCATAGAPP – Singles, Seniors, Childless Couples, And Teens And Gays Against Parasitic Parents (fictional organization from The Simpsons) SSD (i) Solid-state drive (s) South Sudan (ISO 3166 trigram) SSDC – (i) U.S.
Working at the Royal Society in the 1660s, the physician Richard Lower began examining the effects of changes in blood volume on circulatory function and developed methods for cross-circulatory study in animals, obviating clotting by closed arteriovenous connections. The new instruments he was able to devise enabled him to perform the first reliably documented successful transfusion of blood in front of his distinguished colleagues from the Royal Society. According to Lower's account, "...towards the end of February 1665 [I] selected one dog of medium size, opened its jugular vein, and drew off blood, until its strength was nearly gone. Then, to make up for the great loss of this dog by the blood of a second, I introduced blood from the cervical artery of a fairly large mastiff, which had been fastened alongside the first, until this latter animal showed ... it was overfilled ... by the inflowing blood." After he "sewed up the jugular veins", the animal recovered "with no sign of discomfort or of displeasure". Lower had performed the first blood transfusion between animals. He was then "requested by the Honorable [Robert] Boyle ... to acquaint the Royal Society with the procedure for the whole experiment", which he did in December 1665 in the Society's Philosophical Transactions. The first blood transfusion from animal to human was administered by Jean-Baptiste Denys, eminent physician to King Louis XIV of France, on June 15, 1667. He transfused the blood of a sheep into a 15-year-old boy, who survived the transfusion.
Sources: en.wikipedia.org
cadastral gene A regulatory gene that restricts the expression of other genes to specific tissues or body parts in an organism, typically by producing gene products which variably inhibit or permit transcription of the other genes in different cell types. The term is used most commonly in plant genetics.
In biology, a mutation is an alteration in the nucleic acid sequence of the genome of an organism, virus, or extrachromosomal DNA. Mutations result from errors during replication, mitosis, meiosis, or damage to DNA, which then may trigger error-prone repair or cause an error during replication (translesion synthesis). Mutations may also result from substitution, insertion or deletion of segments of DNA due to mobile genetic elements.
==== Defence procurement ==== The Defence budget was protected by a NATO commitment to increase defence spending by 3% per annum until 1986, but was still subjected to cuts in the proposed budget during Heseltine's tenure. Some senior military figures felt that Heseltine was obsessed with the minutiae of running the department rather than thinking strategically about defence priorities and procurement. Dwin Bramall recalled that Heseltine never showed an interest in the strategy papers he sent him. Thatcher was highly critical of him for failing to take a decision on the development of the Nimrod early-warning plane, on which £660 million was spent over a ten-year period, only for the project to be cancelled by his successor. Some accusations were raised (the Commons Select Committee on Defence thought him "vague and evasive" on the issue in 1985) that the accounts were being massaged to push costs into the period after 1986, when cuts would become inevitable. The journalist Hugo Young later recalled Heseltine briefing journalists confidentially that spending and funding could be reconciled until 1986, by which time he expected "to be gone". In Cabinet, Heseltine resented being kept out of economic debates and suspected he might be reshuffled to the job of Secretary of State for Northern Ireland as Jim Prior had been. He had tried to pursue a one-man industrial policy, as defence spent £17 billion per annum, 5% of UK GDP, half of it on procurement, and 90% of that in the UK, with 700,000 British jobs dependent on it.
== Fli proteins == The switch complex comprises at least three proteins: FliG, FliM and FliN. It has been shown that FliG interacts with FliM, FliM interacts with itself, and FliM interacts with FliN. Several amino acids within the middle third of FliG appear to be strongly involved in the FliG–FliM interaction, with residues near the N- or C-termini being less important. Such clustering suggests that FliG-FliM interaction plays a central role in switching. Analysis of the FliG, FliM and FliN sequences shows that none are especially hydrophobic or appear to be integral membrane proteins. This result is consistent with other evidence suggesting that the proteins may be peripheral to the membrane, possibly mounted on the basal body M ring. FliG is present in about 25 copies per flagellum. The structure of the C-terminal domain of FliG is known, this domain functions specifically in motor rotation. "Flig" in the North End of Flint, Michigan stands for "Free Lunch Getter." The word is an Ebonics acronym and is widely used throughout the Midwest United States.
Bush in 2004 to do so. Trump is also the first presidential candidate since Nixon in 1968 to successfully make a political comeback by winning an election after losing a previous one. Trump carried 31 of 50 states. Trump is the first Republican presidential candidate to win Nevada since George W. Bush in 2004. The 2024 presidential election was the first presidential election since 1976 in which all 50 states and Washington, D.C. shifted towards the same party. Approximately 90% of counties swung towards Trump between the 2020 and 2024 elections, encompassing both rural and urban areas. The 2024 election was the first presidential election since 1932 in which the losing candidate failed to flip a single county. Even among states that voted heavily for Biden in the 2020 election, Trump's gains were significant. The states of New York and New Jersey swung over ten points toward Trump, and Trump also made gains in Harris' home state of California. However, relative to 2016, only 28 states shifted to the right by 2024, with an average shift relative to 2016 of 1 point. While Trump made gains among young voters compared to Republicans in recent presidential elections, especially among young men, exit polls found Harris won young voters by 54 to 51 percent of voters under 30. However, Millennials and Generation Z constituted a minority of the voting public. Voters 44 years of age or younger (born in 1980 or later) were estimated by the exit poll to comprise 37% of the electorate.
Sources: en.wikipedia.org
Sealed vials or containers should be kept at the temperature specified by stability data, often controlled room temperature or 2–8 °C. Moisture and oxygen barriers are important because both can degrade sensitive materials. Opened containers may need immediate use or protection from ambient humidity.
It usually appears as a uniform porous plug or cake that fills the container without excessive shrinkage. Color should match the specification, and there should be no meltback or visible foreign matter. Minor cracking may be acceptable if the product still meets moisture and potency limits.
Water content is a key stability parameter because excess water can promote hydrolysis, aggregation, or cake collapse. It also affects reconstitution and product weight. Each product has a target range, and methods such as Karl Fischer titration are used to verify it.
Lyophilization removes water by sublimation from a frozen material, while evaporation changes liquid water into vapor. The low-pressure freezing step avoids the liquid phase and can preserve heat-sensitive structures.