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Exploring DNA's essence, this guide illuminates its structure, function, and purification techniques, essential in fields like medicine and biotechnology. Key Takeaways: DNA's Structure: Composed of nucleotides adenine, thymine, cytosine, guanine, forming a double helix. Charge Properties: DNA exhibits a negative charge due to phosphate groups. Central Dogma: DNA's role in protein synthesis and inheritance. Extraction Methods: Techniques for isolating DNA. Purification Techniques: Ensuring DNA's integrity for analysis. Genomic DNA: The complete genetic information in cells. DNA Assays: Tools for DNA analysis and research applications. { "@context": "https://schema. …

Introduction Transformation of bacteria with plasmids is not only of note for bacterial studies but also can be used for gene expression studies in mammalian cells. Most plasmids are of bacterial origin and contain both a bacterial origin of replication and an antibiotic resistance gene which can be used as a selectable marker. The process of transformation allows foreign DNA to be introduced into a cell. Genetic modifications can be made to various bacterial strains to make them more amenable to transformation. Such modifications will maintain the plasmid without rearranging the plasmid DNA. Certain treatments have been shown to increase the transformation efficiency of bacteria. …

What is Gut Inflammation? The gut, or gastrointestinal (GI) tract is a long tube that starts from the mouth and extends to the anus. It includes various organs such as the esophagus, stomach, small intestine, large intestine, and rectum, responsible for digestion, absorption of nutrients, and elimination of waste. The gut plays a vital role in our overall health. However, inflammation can occur within the gut, leading to various inflammatory diseases. Gut inflammation is an immune response triggered by factors such as infections or autoimmune reactions. This immune response releases molecules that cause inflammation, resulting in tissue damage. Conditions …

Immunology · ImmunophenotypingCD Markers on B Cells: Development, Subsets and ImmunophenotypingB cells change their surface marker profile at every stage from bone marrow progenitor to antibody-secreting plasma cell, and those changes are what make each stage identifiable by flow cytometry. This guide sets out the markers stage by stage and subset by subset, explains the two that matter most in practice — CD19 and CD20 — and covers the gating strategy and controls that make the readout trustworthy.Browse B cell markers →CD19Pan-B, retained into plasma cellsCD20Lost on plasma cellsCD27The human memory B markerCD138Plasma cell identityKey takeawaysCD19 and CD20 are not interchangeable. CD19 ap …

Cell Culture · ProtocolsHaemocytometer Cell Counting: Procedure, Calculation and Common ErrorsA haemocytometer turns a known chamber volume into a cell concentration, and the whole method rests on four numbers: a 1 mm² square, a 0.1 mm depth, the 10⁻⁴ mL that gives, and the ×10⁴ multiplier that follows. This guide covers the geometry, the counting rules that determine whether your number is reproducible, viability by dye exclusion, and where manual counting should give way to an assay.Browse viability assays →1 mm²Area of one large square0.1 mmDepth of the counting chamber10⁻⁴ mLVolume above one large square×10⁴Multiplier to reach cells/mLKey takeawaysOne large square is 1&nbs …

Explore the world of astrocytes, crucial star-shaped cells in the brain, and understand how specific markers help study their roles in neural health and disorders. Key Takeaways: Astrocytes are star-shaped glial cells vital for brain function and homeostasis. They regulate the brain environment, neurotransmitter levels, and synaptic signaling. Astrocyte markers, like GFAP and S100B, identify and study astrocyte functions. What Are Astrocytes? Astrocytes are a type of star-shaped glial cell found in the central nervous system. They play essential roles in maintaining neuronal health and supporting brain homeostasis. In order to understand the functions and charac …

Oligodendrocytes are pivotal CNS cells, integral for myelin formation and nerve function, with implications in various neurological disorders. Key Takeaways Oligodendrocytes are specialized glial cells in the central nervous system (CNS), crucial for myelinating axons, enhancing nerve signal transmission, and supporting neuronal function. They differ from Schwann cells, which myelinate in the peripheral nervous system. Oligodendrocytes are implicated in diseases like multiple sclerosis and Alzheimer's, with treatment strategies focusing on immunomodulation, remyelination, neuroprotection, and symptomatic relief. What Are Oligodendrocytes? Oligodendrocytes are a …

Radial glial cells are essential in shaping the nervous system, serving dual roles in neurogenesis and structural support during the brain's developmental stages. Key Takeaways: Radial glial cells are vital in neurogenesis and brain development, acting as both progenitor cells and structural guides. They exhibit unique radial morphology, extending from the ventricular zone to the pial surface. Radial glial cells differentiate into various neuronal and glial types, influencing neural circuit formation. Table of Contents Jump to a section: - Cell Identification - Radial Glial Stem Cells - Glial Cell Development - Functions and Impacts of RGCs - T …

Neuroscience · BiomarkersA Guide to Tau Proteins & TauopathiesTau keeps the neuronal cytoskeleton standing up. When its phosphorylation goes wrong, the same protein becomes the aggregate that defines Alzheimer’s disease, frontotemporal dementia and progressive supranuclear palsy. This guide covers tau’s structure and isoforms, the disorders it drives, and how researchers measure it.Browse tau assays →6Tau isoforms in adult human CNS17Chromosome carrying MAPT3R / 4RRepeat-domain isoform classes45–65 kDaTau isoform mass rangeKey takeawaysTau, encoded by MAPT on chromosome 17, binds and stabilises axonal microtubules through its repeat domains.Alternative splicing yields six CNS isoforms, s …

Cell Signalling · Growth FactorsGrowth Factors: Families, Receptors and Signalling PathwaysGrowth factors are secreted proteins that instruct cells whether to divide, differentiate, migrate or survive. Despite covering families as different as FGF, TGF-beta, EGF, insulin, VEGF and PDGF, they converge on a small number of receptor types and an even smaller number of downstream pathways. This guide covers each major family, the receptor class it uses, and why that distinction matters more than the ligand itself.Browse growth factor ELISA kits →8Major families covered23Members of the FGF familyRTKsThe dominant receptor classPI3K & MAPKThe shared downstream pathwaysKey takeawaysGrowth factor …

The initial identification of PD-1 as a potential target for cancer treatment occurred in the late 1990s and early 2000s through studies exploring the regulation of T-cell responses. The development and approval of PD-1 inhibitors, such as pembrolizumab and nivolumab, for the treatment of various cancers have since transformed the landscape of cancer immunotherapy. The use of PD-1 pathway inhibitors in cancer treatment has rapidly gained recognition and has become a cornerstone of modern immunotherapeutic approaches. Table of Contents Jump to a section: - PD-1 Pathway in Cancer - Immune Checkpoints - Cancer Immunothera …

Gastroenterology · Barrier BiologyZonulin and Intestinal PermeabilityZonulin is the best-characterised endogenous regulator of intestinal tight junctions — the protein that opens the gut barrier on demand, and the one most often invoked to explain what is popularly called leaky gut. This guide covers what zonulin is, how it loosens tight junctions, which conditions it has been linked to, and how it is measured in the laboratory.Browse barrier assays →pre-HP2The protein identified as zonulin16Chromosome carrying the HP gene4Families of tight junction protein2Best-established triggers: gluten and bacteriaKey takeawaysZonulin is a signalling protein that reversibly loosens the tight junctions b …

Key Takeaways: Microglia are immune cells in the CNS, originating from myeloid precursor cells. They surveil the CNS, respond to changes, and maintain neural health. Microglia exist in different states: amoeboid, ramified, and reactive. Their activation is crucial in neurodegenerative diseases and brain health. What are Microglia? Microglia are a specialized type of immune cells that reside within the central nervous system (CNS), including the brain and spinal cord. Originating from myeloid precursor cells, microglia colonize the CNS during early development. In their resting state, microglia exhibit a distinctive morphology with small cell bodies and highly branched p …

What are Autoimmune Diseases? Autoimmune diseases are a diverse group of disorders where the immune system mistakenly attacks the body's own cells, tissues, and organs, leading to inflammation and tissue damage. Examples include rheumatoid arthritis (joints), systemic lupus erythematosus (multiple organs), multiple sclerosis (central nervous system), and type 1 diabetes (pancreas). The causes of autoimmune diseases involve genetics, environmental triggers, and immune dysregulation. Emerging research suggests that dysbiosis of the gut microbiota may contribute to the development and progression of autoimmune diseases by disrupting immune regulation and promoti …

Introduction Cellular senescence is a fascinating phenomenon that plays a crucial role in the aging process and various age-related diseases. It is essential to explore the cellular sources, how cells age, and define the concept of senescence to gain a comprehensive understanding of this complex biological process. Key Takeaways Cellular senescence is a state of irreversible growth arrest with significant implications for aging and age-related diseases. Strategies to counteract senescence include senolytics, targeting key pathways, and lifestyle interventions. Senescent cells contribute to tissue dysfunction and chronic inflammation through the senescence- …

Immunology · Antigen PresentationDendritic Cells: Markers, Activation and SubtypesDendritic cells are the professional antigen-presenting cells that decide whether an immune response happens at all. They are also awkward to identify, because no single marker is exclusive to them — they are defined by a combination of positive markers and the absence of other lineages. This guide covers the markers that actually work, how activation and cross-presentation function, and the real subsets, including which cells share the name without sharing the lineage.Browse DC marker antibodies →cDC1 / cDC2 / pDCThe main human subsetsCD11c & HLA-DRThe core conventional DC gateType I IFNPlasmacytoid DC sig …

Oct-4 stem cells, also known as Octamer-binding transcription factor 4 stem cells, are a fascinating area of study in the field of stem cell research. These stem cells hold great promise due to their unique characteristics and potential applications in regenerative medicine and developmental biology. This article provides information on Oct-4 stem cells, their properties, roles, and therapeutic implications. What are Oct-4 Stem Cells? Octamer-binding transcription factor 4 stem cells (Oct-4) stem cells are a subtype of pluripotent stem cells that express the Oct-4 transcription factor. Belonging to the POU family of homeodomain transcription factors, Oct-4 …

Stem Cells: What are they and how they can help treat diseases Stem cells are a unique population of cells that possess the ability to self-renew and differentiate into specialized cell types. They play crucial roles in tissue maintenance, repair, and regeneration throughout life. Stem cells have the potential to treat diseases, injuries, and degenerative conditions. Stem cells are used medical procedures like bone marrow transplants. Stem cells' versatile nature and vital functions make them a subject of intense scientific exploration and therapeutic potential. { "@context": "https://schema.org", "@type": "BlogPosting", "mainEntityOfPage": { "@type": "WebPa …

Cell counting is an important part of many different scientific experiments, enabling researchers to gather crucial data about cell populations and their characteristics. In this step-by-step guide, we will delve into the utilization of a hemocytometer, coupled with trypan blue staining, to achieve accurate cell counting and determine cell viability. A Neubauer cell chamber, also referred to as a hemocytometer, stands as a versatile and indispensable tool in the realm of cell counting and viability assessment. Comprising two integral components, namely the counting chamber and the cover slip, the hemocytometer offers a comprehensive solution for precise cell quantification. The co …

Antibodies · Reagent GuideMonoclonal vs Polyclonal Antibodies: Key DifferencesMonoclonal and polyclonal antibodies are the two workhorse reagent types in research, diagnostics and therapy. Monoclonals come from a single B-cell clone and bind one epitope with high specificity, while polyclonals are a diverse mixture that binds many epitopes for high sensitivity. This guide explains how each is made, their advantages and limitations, their uses — including as drugs — and how to choose between them.Browse Antibodies →mAbONE EPITOPEpAbMANY EPITOPESHybridomamAb PRODUCTIONTherapeuticsmAb DRUGSContentsKey TakeawaysWhat are Antigens and AntibodiesThe Art of Antibody Process DevelopmentWhat is a reco …

Biochemistry · Cell SignallingPhosphorylation: Types, ATP Synthesis and Cell SignallingAdding a phosphate group is how cells both store energy and switch proteins on and off. The same chemistry underlies ATP synthesis in mitochondria and chloroplasts and the regulatory phosphorylation that drives every signalling cascade. This guide covers the three metabolic routes to ATP, how protein phosphorylation works as a switch, and how phosphorylation is measured.Browse phospho antibodies →3Routes to ATP: substrate-level, oxidative, photo~30–32ATP per glucose, current estimateSer / Thr / TyrResidues phosphorylated in proteinsATP synthaseCouples proton gradient to synthesisKey takeawaysPhosphorylatio …

Immunology · HyperinflammationCytokine Storm and Cytokine Release Syndrome: Mechanisms, Triggers and MarkersA cytokine storm is a self-amplifying inflammatory response in which cytokine release drives further immune activation faster than regulatory mechanisms can restrain it. The term covers several distinct entities — CAR-T cytokine release syndrome, haemophagocytic lymphohistiocytosis, macrophage activation syndrome and severe infection-driven hyperinflammation. This guide covers the shared mechanism, what distinguishes them, and the cytokines and markers used to track them.Browse cytokine ELISA kits →IL-6The central mediatorFeed-forwardWhy it becomes self-sustainingFerritinKey severity m …

Cell Biology · PathologyNecrosis: Types, Causes, Mechanisms and How It Is MeasuredNecrosis is cell death accompanied by membrane rupture and release of intracellular contents — which is what makes it inflammatory, and what distinguishes it from apoptosis. It was long regarded as purely uncontrolled, but a large part of it is now known to be actively regulated. This guide covers the classical morphological patterns, the causes, the regulated pathways, and the assays used to detect and distinguish them.Browse cell death assays →6Classical morphological patternsLDHStandard membrane-integrity readoutRIPK3 / MLKLNecroptosis effector kinasesHMGB1Archetypal DAMP released on ruptureKey takeawaysNecr …

Immunology · Cytokine SignallingTNF-alpha and Inflammation: Structure, Signalling & TherapyTumour necrosis factor alpha (TNF-α) is one of the most important pro-inflammatory cytokines in the body. Signalling through two receptors to drive both inflammation and cell death, it sits at the centre of the immune response — and its overactivity underlies autoimmune diseases from rheumatoid arthritis to inflammatory bowel disease, making it a landmark drug target.Explore TNF-alpha pathway kits →TrimerTNF-α acts as a three-chain moleculeTNFR1/2its two signalling receptorsNF-κBthe key downstream pathway#1autoimmune drug targetKey TakeawaysTNF-α is a major pro-inflammatory cytokine produced mainly …