If you have been reading about Sublimation and want a single page that covers the useful parts, this is it: definitions, context, how it is studied, and the questions that come up repeatedly.
Last reviewed on 2025-12-19. Where a claim depends on a specific study, the study is described rather than over-claimed.
Quality control for lyophilized materials includes visual inspection of the cake, measurement of residual moisture, and tests for reconstitution time. An acceptable cake is typically uniform and may be slightly porous; shrinkage, meltback, or cracks can indicate process deviations. Analytical methods such as Karl Fischer titration, thermogravimetric analysis, and near-infrared spectroscopy quantify water content. Reconstitution time is recorded because a very slow or incomplete dissolution can signal collapse or aggregation. Stability studies compare samples stored under defined temperature and humidity conditions over months or years.
Regulatory expectations for lyophilized products focus on consistent manufacture and documented stability. Batches are often monitored for moisture, appearance, potency, and sterility where applicable. Process parameters such as shelf temperature, chamber pressure, and drying time are recorded and controlled within validated ranges. Open questions remain about how best to predict long-term stability from short accelerated studies, especially for complex biologics. Variations in freezing rate and ice crystal size can produce differences that are not always visible but may affect performance.
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.
| Property | Value | Notes |
|---|---|---|
| Typical storage temperature | 2–8 °C | Common for biological materials; some require −20 °C or colder |
| Residual moisture specification | 0.5–3.0% w/w | Product-specific; measured after drying |
| Common moisture method | Karl Fischer titration | Coulometric or volumetric; detects water content |
| Cake appearance | Uniform and porous | Collapse, meltback, or cracks are deviations |
| Reconstitution time | Seconds to several minutes | Depends on formulation, cake structure, and diluent |
These include the four species of anteater, more than a dozen armadillos, eight species of pangolin (plus fossil species), eight species of the monotreme (egg-laying mammals) echidna (plus fossil species), the Fruitafossor of the Late Jurassic, the marsupial numbat, the African aardvark, the aardwolf, and possibly also the sloth bear of South Asia, all unrelated. Marsupial koalas of Australia have evolved fingerprints, indistinguishable from those of non-related primates, such as humans. The Australian honey possums acquired a long tongue for taking nectar from flowers, a structure similar to that of butterflies, some moths, and hummingbirds, and used to accomplish the same task. The marsupial sugar glider and squirrel glider of Australia are like the placental flying squirrel. Both lineages have independently developed wing-like flaps (patagia) for leaping from trees, and big eyes for foraging at night. The North American kangaroo rat, Australian hopping mouse, and North African and Asian jerboa have developed convergent adaptations for hot desert environments; these include a small rounded body shape with large hind legs and long thin tails, a characteristic bipedal hop, and nocturnal, burrowing and seed-eating behaviours. These rodent groups fill similar niches in their respective ecosystems. Opossums and their Australasian cousins have evolved an opposable thumb, a feature which is also commonly found in the non-related primates. The marsupial moles have many resemblances to the placental talpid moles and golden moles.
21 May – Scottish culture secretary Angus Robertson calls for an urgent meeting with Creative Scotland after an arts project involving real sex was given over £100,000 in government funding. Aberdeen sheriff Jack Brown is to be removed from office over sexual harassment allegations after a tribunal finds he has committed "serious improper conduct" towards two women. 23 May – Police Scotland announces that it has submitted a "standard prosecution report" concerning its investigation into SNP finances to the Crown Office and Procurator Fiscal Service. First Minister John Swinney announces he will not accept a parliamentary committee ruling to exclude Michael Matheson from Holyrood for 27 days over his £11,000 iPad charges bill, claiming the decision is "prejudiced" due to the involvement of a Conservative MSP who previously made comments about Matheson. 25 May – The Faculty of Advocates finds Andrew Smith KC guilty of serious misconduct over "serious and reprehensible" actions relating to a legal case involving a dating app business in which he had a "close personal involvement". Celtic defeat Rangers 1–0 to win the 2024 Scottish Cup final. 29 May – MSPs vote 64–0 to exclude former Health Secretary Michael Matheson from the Scottish Parliament for 27 sitting days, and to suspend his salary for 54 days, after he breached expenses rules by accululating an £11,000 bill on his parliamentary iPad. The governing SNP abstains from voting, and calls for a review of the complaints procedure, suggesting it could be open to bias.
=== Generic names === Nandrolone is the generic name of the drug and its INNTooltip International Nonproprietary Name, BANTooltip British Approved Name, DCFTooltip Dénomination Commune Française, and DCITTooltip Denominazione Comune Italiana. The formal generic names of nandrolone esters include nandrolone cyclohexylpropionate (BANMTooltip British Approved Name), nandrolone cyclotate (USANTooltip United States Adopted Name), nandrolone decanoate (USANTooltip USAN, USPTooltip United States Pharmacopeia, BANMTooltip British Approved Name, JANTooltip Japanese Accepted Name), nandrolone laurate (BANMTooltip British Approved Name), nandrolone phenpropionate (USPTooltip United States Pharmacopeia), and nandrolone phenylpropionate (BANMTooltip British Approved Name, JANTooltip Japanese Accepted Name).
Crick was aware that research on consciousness was a difficult task, as he wrote to Martynas Yčas in April 1996:I don't think we shall fully understand consciousness by the end of this century, but it's possible we can get a glimpse of the answer by then. Whether it will all fall into place, as molecular biology did, without a vital force, or whether we need a radical formulation, only time will tell. Best wishes, Yours, Francis. P.S. By the way, I've not been knighted.
Clinafloxacin is an investigational fluoroquinolone antibiotic. Despite its promising antibiotic activity, the clinical development of clinafloxacin has been hampered by its risk for inducing serious side effects.
Sources: en.wikipedia.org
In geochemistry, geophysics and nuclear physics, primordial nuclides, or primordial isotopes, are nuclides found on Earth that have existed in their current form since before Earth was formed. Primordial nuclides were present in the interstellar medium from which the Solar System was formed, and were formed in the Big Bang, by nucleosynthesis in stars and supernovae followed by mass ejection, by cosmic ray spallation, or from other processes throughout the history of the universe. They are the stable nuclides plus the fraction of the long-lived radionuclides surviving from the primordial solar nebula through planet accretion until the present; 286 such nuclides are known.
Structurally, insulin icodec consists of two peptide chains connected by a disulfide bridge, similar to insulin. However, it includes a C20 fatty diacid-containing side chain to enable strong, reversible albumin binding. Additionally, three amino acid substitutions enhance molecular stability, reduce insulin receptor binding, and slow clearance, collectively extending its duration of action. Insulin icodec received approval for medical use in Canada in March 2024. In the same month, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) issued a positive opinion, recommending marketing authorization for insulin icodec. Subsequently, insulin icodec was approved for medical use in the European Union in May 2024. Insulin icodec is currently marketed by Novo Nordisk under the name Awiqli (pronounced A-week-ly).
== External links == Picture of Margaret Oakley Dayhoff, c. 1980. Owned by her daughter Ruth E. Dayhoff, M.D. Made available by the National Library of Medicine. Profile and photographs of Margaret O. Dayhoff in Grandma got STEM project. Information submitted to the project by Margaret Dayhoff's son-in-law Vincent, husband of Ruth E. Dayhoff. Also contains biographical information about descendants. Baby Joseph and Vrundha M. Nair .2012 Woman Innovator in Bioinformatics: Dr. Margaret Oakley Dayhoff. Adv Bio Tech:12 (01) 32–34
=== KwaZulu Bantustan === KwaZulu was a bantustan in South Africa, intended by the apartheid government as a semi-independent homeland for the Zulu people. The capital was moved from Nongoma to Ulundi in 1980. It was led until its abolition in 1994 by Chief Mangosuthu Buthelezi of the Zulu royal family and head of the Inkatha Freedom Party (IFP). It was merged with the surrounding South African province of Natal to form the new province of KwaZulu-Natal. The name KwaZulu translates roughly as Place of Zulus, or more formally Zululand.
== Signs and symptoms == People with CIP/CIM have diffuse, symmetric, flaccid muscle weakness. CIP/CIM typically develops in the setting of a critical illness and immobilization, so patients with CIP/CIM are often receiving treatment in the intensive care unit (ICU). Weakness (motor deficits) occurs in generalized fashion, rather than beginning in one region of the body and spreading. Limb and respiratory (diaphragm) muscles are especially affected. The muscles of the face are usually spared, but in rare cases, the eye muscles may be weakened, leading to ophthalmoplegia. Respiratory difficulties can be caused by atrophy of the muscles between the ribs (intercostals), atrophy of the diaphragm muscle, and degeneration of the nerve that stimulates the diaphragm (phrenic nerve). This can prolong the time it takes to wean a person off of a breathing machine (mechanical ventilation) by as much as 7 – 13 days. Deep tendon reflexes may be lost or diminished, and there may be bilateral symmetric flaccid paralysis of the arms and legs. The nervous system manifestations are typically limited to peripheral nerves, as the central nervous system is usually unaffected.
Sources: en.wikipedia.org
An intraarticular fracture is a bone fracture that typically runs parallel to the joint surface in which the break crosses into the surface of a joint, through the articular cartilage. This always results in damage to the cartilage, an area of limited healing capability. Compared to extraarticular fractures, intraarticular have a higher risk for developing long-term complications, such as posttraumatic osteoarthritis. For the majority of these fractures, anatomic reduction is vital to maintain the integrity of the joint surface.
==== Education ==== NCCAM also funds education and outreach programs. Despite the negative findings on the effectiveness of distance healing, NCCAM awarded $180,000 to a consultant to develop an Internet-based wellness program on the healing by Qigong.
Absolute specificity can be thought of as being exclusive, in which an enzyme acts upon one specific substrate. Absolute specific enzymes will only catalyze one reaction with its specific substrate. For example, lactase is an enzyme specific for the degradation of lactose into two sugar monosaccharides, glucose and galactose. Another example is Glucokinase, which is an enzyme involved in the phosphorylation of glucose to glucose-6-phosphate. It is primarily active in the liver and is the main isozyme of Hexokinase. Its absolute specificity refers to glucose being the only hexose that is able to be its substrate, as opposed to hexokinase, which accommodates many hexoses as its substrate.
Synthesis of RNA typically occurs in the cell nucleus and is usually catalyzed by an enzyme—RNA polymerase—using DNA as a template, a process known as transcription. Initiation of transcription begins with the binding of the enzyme to a promoter sequence in the DNA (usually found "upstream" of a gene). The DNA double helix is unwound by the helicase activity of the enzyme. The enzyme then progresses along the template strand in the 3' to 5' direction, synthesizing a complementary RNA molecule with elongation occurring in the 5' to 3' direction. The DNA sequence also dictates where termination of RNA synthesis will occur. Primary transcript RNAs are often modified by enzymes after transcription. For example, a poly(A) tail and a 5' cap are added to eukaryotic pre-mRNA and introns are removed by the spliceosome. There are also a number of RNA-dependent RNA polymerases that use RNA as their template for synthesis of a new strand of RNA. For instance, a number of RNA viruses (such as poliovirus) use this type of enzyme to replicate their genetic material. Also, RNA-dependent RNA polymerase is part of the RNA interference pathway in many organisms.
Sources: en.wikipedia.org
Most are held in sealed containers at controlled temperatures, often 2–8 °C, while some require frozen storage. Protection from moisture and light helps preserve the dry matrix. Exact conditions are set by the manufacturer or study protocol.
Cake collapse suggests the material exceeded its collapse temperature during drying or later absorbed moisture. It can lead to slower reconstitution, uneven moisture, and reduced stability. Appearance alone may not reveal the cause, so process records and moisture tests are used together.
Some residual moisture is common and may be acceptable within a defined range. Very low moisture can alter stability or increase brittleness, while high moisture promotes hydrolysis and microbial risk. Specifications are based on product-specific stability data.
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.