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Nuclei in Medical News

How red blood cells nuke their nuclei

CAMBRIDGE, Mass. (February 10, 2008) Unlike the rest of the cells in your body, your red blood cells lack nuclei. That quirk dates back to the time when mammals began to evolve. Other vertebrates such as fish, reptiles, and birds, have red cells that contain nuclei that are inactive. Losing the n...

Stemedica Discovers Significant Breakthrough in the Use of Stem Cells and Stem Cell Factors for the Treatment of Retinal Degeneration

...RG) compared to non-treated (normally dystrophic) control animal. 2. The RPE and NSC cells were effective in preserving the thickness of the outer nuclei layer of the retina. 3. A contra lateral effect was observed between the test and control eyes. As a result, both eyes exhibited significant imp...

Extreme makeover: Stanford scientists explore new way to change cell's identity

...ybrids called heterokaryons. In heterokaryons, the nuclei of each cell type remains distinct, and the influe...each cell type. They found that if the muscle cell nuclei outnumbered the skin cell nuclei, the skin nuclei began to express muscle-specific genes within a fe...

An adjuvant chemotherapeutic agent in gastric cancer therapy

...by transmission electron microscope. Apoptosis was also quantified by two methods: the detection of acridine orange/ethidium bromide-stained condensed nuclei by fluorescent microscopy and flow cytometry. The expressions of Bcl-2 and Bax were evaluated by immunostaining. After 24h of being treated wit...

Scientists uncover secrets of potential bioterror virus

... NSs. The protein was already known to be a major factor in making Rift Valley fever more virulent; earlier research had shown that it penetrated cell nuclei and disrupted the coding of RNA messages, including those ordering the production of the antiviral protein interferon beta. "We didn't know what th...

Internationally Acclaimed Researcher Joins UH Faculty

...rcial potential," he said. Gustafsson is revered worldwide for his translational research on nuclear receptors, a class of proteins found in cell nuclei that capture hormone molecules and interact with and control the expression of genes. Research in this field is vital in developing treatments for suc...

Better MRI scans of cancers made possible by TU Delft

...dy. It is ultimately the behaviour of the hydrogen nuclei in the water molecules that makes MRI possible and...he lanthanide chelate on the neighbouring hydrogen nuclei (the so-called water exchange) and the more hydrogen nuclei affected, the better the MRI signal obtained. Djan...

Osteoporosis Drug Prompts Increase in Certain Bone Cells

.... These women also had "giant" osteoclasts -- single cells fused together -- with as many as 40 nuclei. Normally, one would see only seven or eight nuclei in one grouping, the study authors said. At this point, it's unclear what these findings mean in the "real world." "Seven or eight cells fused ...

A new light on the anti-tumor mechanisms of Scutellaria barbata

...creased. Flow cytometry assay also showed ESB had positive effect on apoptosis. Typical apoptotic morphology such as condensation and fragmentation of nuclei and blebbing membrane of the apoptotic cells could be observed through transmission electron microscope and fluorescence microscope. Further investiga...

Scientists at CSHL uncover new RNA processing mechanism and a new class of small RNAs

...r. Spector says, is intriguing in part because MALAT1 is known to be a good marker of cancer progression: it is found at abnormally high levels in the nuclei of cancer cells with a propensity to become metastatic. One new RNA molecule; more to come? The discovery of the cytoplasmic small RNA fragmen...
Nuclei in Medical Products

Akahoshi Prechop (temporal approach)

Description:... Straight shafts, cross action. Round handle. Divides nucleus for phacoemulsification. Nuclear division is attained without grooving. nuclei of any hardness can be pre-chopped with pre-chop forceps and nucleus sustainer. Phaco of pre-chopped nuclear fragments is rapid. Risk of rupturing pos...
Company:Duckworth & Kent Ltd.

The Phaco System

Features:...cted entirely of the ultimate surgical metal, this U/S hand piece will not corrode, the most advanced high-power ultrasonic available can emulsify all nuclei from the softest to the very hardest densities, advanced irrigation and aspiration, built-in vitrectomy and cautery, this phaco system is compact enou...
Company:Ebe Medical Products Co., Ltd.
Nuclei in Biological News

Stem cell nuclei are soft 'hard drives,' Penn study finds

Biophysicists at the University of Pennsylvania have discovered that the nuclei of human stem cells are particularly soft and flexible, rather than hard, making it easier for stem cells to migrate through the body and to adopt different shapes, but ultimately to put human genes in the correct nucle...

New, more direct pathways from outside the cell-to-cell nuclei discovered

A team of Brooklyn College researchers has shattered a long-held belief that no direct pathway exists between material outside of a cell and the cell nucleus. (The cell is the smallest metabolically functional unit of life.) It was already known that material outside of a cell can migrate into ...

Discovery of 'master switch' for the communication process between chloroplast and nuclei of plants

Scientists have puzzled for years in understanding how plants pass signals of stress due to lack of water or salinity from chloroplast to nucleus. They know that chloroplasts ?the cellular organelles that give plants their green color ?have at least three different signals that can indicate a plant...

From the glass to the brain in 6 minutes

...blood alcohol content of 0.05 to 0.06 percent a level that impairs ability to drive, but does not induce severe intoxication. In the MRI scanner, the nuclei of atoms in brain tissue were stimulated by a high-frequency impulse and the signal transmitted during the return to the initial condition was receive...

'Disordered' amino acids may really be there to provide wiggle room for signaling protein

...lleagues used a technique called nuclear magnetic resonance spectroscopy, which can determine a protein's shape by measuring how the individual atomic nuclei of a protein interact with an intense magnetic field. Since NMR spectroscopy works best with small proteins not large flexible molecules like NHR...

UCSD researchers make first direct observations of biological particles in high-altitude ice clouds

...nctions between residues of water droplets and ice nuclei in real-time. Ice nuclei are rarer than droplet nuclei and are more likely to create precipitation. T...

Stanford scientists turn adult skin cells into muscle and vice versa

...nd muscle cells together, producing cells that had nuclei from human skin cells and mouse muscle cells. By b...e cell wall, the human skin cells and mouse muscle nuclei could now "talk" to one another via chemical signa... looked at the genes expressed from the human skin nuclei and mouse muscle nuclei. (This was possible becaus...

When every photon counts

...nal mammals. With this unique arrangement, the rod nuclei of nocturnal mammals act as micro-lenses that focu...ght. Computer simulations show that stacks of such nuclei effectively guide the light to the light-sensitive...urnal mammals the chromatin arrangement in the rod nuclei is inverted: Here the heterochromatin is lumped in...

New nucleotide could revolutionize epigenetics

...ce during investigations of the level of 5-methylcytosine in the very large nuclei of Purkinje cells, says Skirmantas Kriaucionis, a postdoctoral associate in...r function in the cerebellum. After developing a new method to separate the nuclei of individual cell types from one another, Kriaucionis was analyzing the ep...

Protein structure determined in living cells

...ventionally, proteins are extracted from the cell, purified, and analyzed in single crystals or in solution. NMR spectroscopy detects signals from the nuclei of hydrogen atoms that are ubiquitous in organic molecules. Measurements in the living cell are challenging because it is difficult to distinguish bet...
Nuclei in Biological Technology

Scientists determine the structure of highly efficient light-harvesting molecules in green bacteria

... exposed to a magnetic field -- to look deep inside the chlorosome. This technique enables researchers to understand the relationships between atomic nuclei in a sample and, ultimately, to acquire structural information about the molecules of interest. "The NMR data revealed to us that the individual ch...

Animal Eggs Not Suitable Substitutes to Produce Stem Cells

...ine that focuses on understanding developmental plasticity and defining the molecular mechanisms that regulate differentiation or dedifferentiation of nuclei and cells. Tables of contents and a free sample issue may be viewed online at www.liebertpub.com/clo Mary Ann Liebert, Inc. , is a privately h...

Spallation Neutron Source sends first neutrons to 'Big Bang' beam line

...energyin the universe," Greene said. "Another set of extremely precise studies at the FNPB will address the interaction between neutrons and simple nuclei and may help to explain universal 'parity' violation," Greene said. "Roughly speaking, parity is the symmetry that implies that the laws of physics ar...

NIST/NIH micromagnets show promise as colorful 'smart tags' for magnetic resonance imaging

...unable properties than conventional injectable MRI contrast agents. MRI contrast agents enhance images by altering the magnetic field seen by hydrogen nuclei in water. Conventional contrast agents are chemically synthesized whereas the new micromagnets are microfabricated. This allows for greater control an...

Berkeley scientists bring MRI/NMR to microreactors

...re made possible by a property found in the atomic nuclei of almost all molecules called spin, which gives rise to a magnetic moment, meaning the nuclei act as if they were bar magnets with a north and s...aining an MRI/NMR signal depends upon an excess of nuclei in a sample with spins pointing in one direction o...

Young's experiment in a hydrogen molecule

...on properties. The authors of this current research, which appears in the latest issue of the journal Science, uses electrons instead of light and the nuclei of the hydrogen molecule as emitting slits. CSIC researcher Ricardo Dez, Vicedirector of the Centre for Materials Physics (a mixed body of the CSIC...

The Role of Engineering in Health Science and Technology

... are creating next-generation medical diagnostics. The application of nuclear magnetic resonance, in which distributions of a given species of atomic nuclei are measured, is the basis of the powerful magnetic resonance imaging (MRI) technique in wide use today. The continuing exponential growth in the num...

Human stem cells stand on their own

... A colony of human embryonic stem cells grown over a period of 10 months in 2004 in the absence of mouse feeder cells. The cell nuclei are stained green; the cell surface appears in red. Photo courtesy of Ren-He Xu/UW-Madison. Madison, Wis. Tackling a pressing and controversial te...

Radiology advance points way to non-invasive brain-cancer treatment

...ent, while gadolinium is opaque. Then, where gadolinium is localized-in the nuclei of the cancer cells only-what's known as "the photoelectric effect" takes p...air, and consequently cell death, gadolinium atoms must be localized in the nuclei of cancer cells." Because of the deadly nature of GBM, De Stasio says a...

Father of life patents downplays historic role

...uses for bacteria. Bacteria, he noted, have undergone 2.7 billion years of evolution, and as a result they know how eukaryotic cells - those with a nuclei and organs (or organelles) - function. They therefore appear not to be content with slowing the growth of cancer cells, but interfering with all of ca...

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Nuclei in Biological Definition

Apoptosis

...s ). Instead of swelling and bursting - hence spilling their possibly damaging internal contents into extracellular space - apoptotic cells and their nuclei shrink, and often fragment. In this way, they can be efficiently phagocytosed (and, as a consequence of this, their components reused) by macropha...

Biology

...n system : Archaea (originally Archaebacteria) -- Bacteria (originally Eubacteria) -- Eukaryota These domains reflect whether cells have nuclei or not as well as differences in cell exteriors. There is also a series of intracellular " parasites " that are progressively less alive in terms of b...

Brain

...n be found on the surface of cerebral cortex, as well as in clusters called nuclei deep within the brain. White matter refers to axons and their surrounding...nt, aided by feedback loops in the cerebellum and the basal ganglia . nuclei in the brainstem control many involuntary muscle functions such as heartrat...

Cell nucleus

...ucleus or nuculeus , kernel) is an organelle , found in the majority of eukaryotic cells , which contains most of the cell's genetic material. nuclei have two primary functions: to control chemical reactions within the cytoplasm and to store information needed for cellular division . The nu...

Diffusion

...ked, water molecules diffuse into the spaghetti strings, making them thicker and more flexible. Carbon dioxide bubbles in soft drinks start as small nuclei and grow because of the diffusion of carbon dioxide molecules towards them. A smelly gas distributes itself over a room by diffusion. A sugar cube...

Morphogenesis

... nuclear divisions without cell division. The many nuclei that are produced distribute themselves around the...ry of the cell cytoplasm. Gene expression in these nuclei is regulated by the Bicoid, Hunchback, and Caudal ... embryo. These intracellular morphogens enter the nuclei and act as transcription factors to control expres...

Eukaryote

...cells , in which the genetic material is organized into membrane - bound nuclei . They include the animals , plants , and fungi , which are mostly mult...hich are unicellular. In contrast, other organisms such as bacteria lack nuclei and other complex cell structures, and are called prokaryotes . The eukar...

Gamete

...fore diploid . The zygote cell receives one set of chromosomes from each of the two gametes involved in the union. After fusion of the two gamete nuclei , and after multiple cell divisions and cellular differentiation , a zygote develops , first into an embryo , and ultimately into a mature indivi...

Fungus

...nucleate ball-shaped cells, which form a mating bridge. The result is that nuclei move from one mycelium into the other, forming a heterokaryon (meaning di...erent nuclei). This is called plasmogamy . Actual fusion to form diploid nuclei is called karyogamy , and may not occur until sporangia are formed. In t...

Histone

...the chief proteins of chromatin . They act as spools around which DNA winds and they play a role in gene regulation . Histones are found in the nuclei of eukaryotic cells . Bacteria do not have histones, but histones are found in certain Archaea, namely Euryarchaea. These archaeal histones may w...
Nuclei in Biological Dictionary

Polar nuclei

Aspects of the topic polar -nucleus are discussed in the following places at Britannica. Assorted References angiosperm gametophytes ( in plant reproductive system: Angiosperms ) ...micropyle, one functions as an egg. As the pollen tube discharges its contents into the female gametophyte, th...

Diploid nuclei

The mondofacto dictionary is a searchable dictionary of terms from medicine, ... A nucleus containing the diploid or normal double complement of chromosomes for ... The dictionary term diploid nucleus was found in Taber's Medical Dictionary Online, along with 60,000 other medical and...

Thalamus

...halamus Brain: Thalamus MRI cross-section of human brain, with thalamus marked. ... The thalamus surrounds the third ventricle. ... Nearby nuclei or structures left blank are not parts of thalamus . ... The thalamus is a paired structure joined at the midline and sitting very near ... Get ...

Telophase

...osis during which the chromosomes of daughter cells are grouped in new nuclei ... during telophase ? Read answer... telophase the final stage of m...tosis. In telophase , the chromosomes are cordoned off into distinct new nuclei in the emerging daughter cells. Psychology research, information, analys...

Syngamy

...vision ... syngamy - 5 ... ... syngamy – Our zoology dictionary has ecology, physiology, genetics of syngamy , ... syngamy The union of nuclei of two gametes to produce a zygote nucleus, ... Pronunciation of syngamy . syngamy synonyms. syngamy usage examples and syngamy quotes. ...

Syncytium

...al syncytium ? ... syncytium a mass of cytoplasm containing several nuclei and enclosed in a membrane but no internal cell boundaries (as in muscle ...n ... This produces a multinucleate cell ( syncytium ) such as ... The nuclei are in a syncytium , that is, there are no cell boundaries, and the ... ...

Spermatids

...rmatids were collected from the testicles of rats of both groups, the ... ( t) Newly formed Sa spermatids of stage I have the smallest spherical nuclei of ... ( y) The nucleus of Sc spermatids in stage VI has shortened to the typical length ... Silver grains are localized in elongating spermat...

Spermatid

.... Rattus norvegicus spermatid perinuclear RNA binding protein (Strbp), mRNA. PA ... As spermatid elongation proceeds, the rostral ends of the nuclei bundle (NB) ... Prior to this, each spermatid sheds a residual body containing membrane ... A round spermatid was drawn into the injection pipe...

Sister chromatid

...omatid ... The knowledge on sister - chromatid cohesion is based mainly on investigations in ... 2005), but sister - chromatid alignment in 4C nuclei was not investigated. ... However, the cohesion between sister chromatids is ultimately destroyed at the ... The dependency of sister chroma...

Sieve tubes

...arranged in a ... Sieve - tubes are remarkable in that their cells lack nuclei when mature. ... Information about Sieve tubes in the free online En...ants, elongated living cells ( sieve - tube elements) of the phloem, the nuclei ... About 4 or 5 years after planting, the older food-conducting sieve ...

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