CE ÎNSEAMNĂ POLYENE ÎN ENGLEZĂ?
polien
Polinii sunt compuși organici polinesaturați care conțin una sau mai multe secvențe de legături duble și carbon-carbon alternante. Aceste legături duble de carbon-carbon interacționează într-un proces cunoscut sub numele de conjugare, ceea ce duce la o stare de energie globală mai mică a moleculei. Amfotericina B este un exemplu de agent antifungic polifenilic galben. Rețineți legăturile duble și singulare alternante din centru. În mod obișnuit, legăturile carbon-carbon care nu sunt conjugate sau conjugate doar cu una sau două alte duble legături carbon-carbon au o cantitate suficient de mare de energie pe care o absorb în regiunea ultravioletă a unui spectru, dar starea de absorbție a polienilor cu numeroase duble conjugate legăturile pot fi coborâte astfel încât să intre în regiunea vizibilă a spectrului, rezultând compuși colorați. Mulți acizi grași sunt polienici și mulți coloranți conțin polienii liniare. Alte exemple de compuși polienici includ beta-caroten, care are culoarea galben-portocaliu în funcție de concentrație, și antimicotice polienice, unele dintre ele fiind colorate în galben.
Definiția polyene în dicționarul Engleză
Definiția polienului din dicționar este un compus chimic care conține un lanț de legături carbon-carbon alternante, unice și duble.
CĂRȚI ÎN ENGLEZĂ ÎN LEGĂTURĂ CU «POLYENE»
Descoperă întrebuințarea
polyene în următoarea selecție bibliografică. Cărți în legătură cu
polyene și extrase din aceasta pentru a furniza contextul de întrebuințare al acestuia în literatura Engleză.
POLYENE AND POLYMETHINE DYES Polyene and polymethine dyes are two
structurally related groups of dyes which contain as their essential structural
feature one or more methine (-CH=) groups. Polyene dyes contain a series of ...
R. M. Christie, Royal Society of Chemistry (Great Britain),
2001
2
Compositional and Failure Analysis of Polymers: A Practical ...
The discoloration results from conjugated polyene sequences which are formed
by dehydrochlorination degradation initiated by the ionizing radiation. Plasticized
PVC films show more pronounced yellowing on UV exposure than PVC films ...
3
Developments in Polyacetylene - Nanopolyacetylene
7,1 Reactivity of Polyene Chain Without Defects In polyene chains, 7i-electrons
are located in pairs in molecular orbitals forming the occupied band. The
unoccupied band is located symmetrically above the occupied band. The
occupied and ...
V.M. Kobryanskii, Rapra Technology Limited,
2000
4
The Antimicrobial Drugs
Antifungal. Drugs. The. Polyene. Antibiotics,. Flucytosine,. Azoles,. Iodide,.
Griseofulvin,. and. Topical. Agents. Amphotericin B Table 12-2. Interconversion of
Acholeplasma laidlawii between sensitivity. The treatment of fungal disease can
be ...
Eric Michael Scholar, William B. Pratt,
2000
5
The Genetics of Candida
A. POLYENE MACROLIDE ANTIBIOTICS Polyene macrolide antibiotics comprise
a family of approximately 200 distinct chemical entities which are produced by a
number of streptomycete species.66 In addition to having excellent activity ...
Donald R. Kirsch, Rosemarie Kelly, Myra B. Kurtz,
1990
6
Antimicrobial Drug Resistance: Mechanisms of Drug ...
The polyene antibiotics represent a class of biologically active fungal metabolites
isolated from the genus Streptomyces, an aerobic actinomycete obtained from
soil (1). While more than one hundred polyene antibiotics have been described, ...
7
Tandem Organic Reactions
Tse-Lok Ho. 4.5. CATIONIC POLYENE CYCLIZATIONS To the organic chemist
the enzymatic cyclization of squalene is a most impressive and fascinating
reaction. The Stork -Eschenmoser postulate of the stereochemical course
stimulated an ...
8
Aspergillosis: from diagnosis to prevention: From Diagnosis ...
Russell E. Lewis Abstract Polyene antifungals have been the cornerstone
treatment for invasive aspergillosis for over 40 years. Whilst new treatment
options have somewhat changed their role, lipid-associated amphotericin B
regimens remain ...
Alessandro Comarú Pasqualotto,
2010
9
Dictionary of Antibiotics & Related Substances
Polyene antibiotics The group of antibiotics known collectively as polyenes are
characterised by a large lactone ring (20-44 membered) containing a series of
conjugated double bonds. This leads to the sub-division of the group into trienes,
...
10
Fundamentals of Pharmacology for Veterinary Technicians
Nystatin and amphotericin B are both polyene antifungal agents. Both drugs are
poorly absorbed by the gastrointestinal tract and work by binding to the fungal
cell membrane. Nystatin is given orally for proliferation of Candida albicans fungi
in ...
Janet Amundson Romich,
2005
ȘTIRI NOI CARE INCLUD TERMENUL «POLYENE»
Află ce ziare naționale și internaționale au scris despre și cum este întrebuințat termenul
polyene în contextul următoarelor știri.
Serum pro-BDNF/BDNF as a treatment biomarker for response to …
... for Promotion of Medical Sciences and Medical Care; has received consultant fees from Polyene Project; has received scholarship donations ... «Nature.com, Iul 15»
Market outlook of polyene phosphatidyl choline in China published …
Investigation Report on China Polyene Phosphatidyl Choline Market, 2010-2019 is a new market research publication announced by ... «WhaTech, Iul 15»
Don links rise in cancer, infertility, others to mycotoxins
Fapohunda said although some reliable explanations have been given for azole resistance, the mechanism in polyene and echinocandins is ... «The Guardian Nigeria, Mai 15»
Research and Markets: Global and Chinese Polyene Phosphatidyl …
Market Research Report on Global and Chinese Polyene Phosphatidyl Choline Industry, 2010-2020 is a professional and in-depth market ... «Business Wire, Apr 15»
Machine Automates Assembly Of Small Molecules
Last year, Burke and coworkers devised a modular way to make most of the polyene motifs found in natural products (Nat. Chem. 2014, DOI: ... «The Biological SCENE, Mar 15»
Major Advances in Synthetic Chemistry Reported in Science by …
... reported by Dr. Burke and his research team regarding the successful manual application of this synthesis process to polyene compounds. «Business Wire, Mar 15»
Temper that coconut oil craze: expert
... has a high temperature it can be cooked at before it starts smoking, and has a high level of Omega-3 polyene fatty acids, Hammond said. «24 Hours Vancouver, Mar 15»
Kids should lay off the pizza, scientists say
Protein, milk solids, unsaturated fats, polyene and phenolic antioxidants (basil tomato sauce), fiber...and a robust crust to exercise juvenile jaws ... «Science AAAS, Ian 15»
Treatment tested for patients with visceral leishmaniasis and HIV in …
The 132-patient open-label study will compare the efficacy and safety of the polyene antifungal amphotericin (AmBisome)(30mg/kg total dose) ... «The Pharmaceutical Journal, Oct 14»
Some antibiotics with your Сheeseburger? Russia regulator probes …
Natamycin, one of the substances in question, is a polyene macrolide antibiotic that keeps packaged products from growing mold and yeast, ... «RT, Iul 14»