Stem structures

Fig. 7. Cross-linker model for nucleosome arrangement in the chromatin fiber superstructure in the presence (a) or absence (b) of H1/H5, based on data in the literature (see text) and H5-containing mono-nucleosome stem structure in Fig. 3(c). In 3D, the plane of the nucleosomes is expected to rotate more or less regularly around the fiber axis, forming a solenoid-like superstructure. Nucleosomes 1, 2 and 5 are in the open conformation of Fig. 3(a), nucleosomes 4 and 7 in the open conformation of Fig. 2(b), and other nucleosomes in the closed negative (Fig. 2(c)) or positive conformations. Nucleosomes are expected to thermally fiuctuate between the different conformations, within an overall dynamic equilibrium of (ALkn) -l (see text). -I- and - refer to node polarities. (From Fig. 5 in Ref. [28].)...

AFM can visualize nucleosome positioning Addition of H1 reportedly compacts the dinucleosome suggested stem-structure formation by HI... 

The broad peaks B, D, and E are shifted far upfield by reaction with bisulfite (Eq. 5-11) suggesting that they are not hydrogen bonded and are present in the loop of the stem-loop structure. Peaks A, E, F, and G correspond to resonances 64, 7, 67, and 4, respectively, in (A) and represent fluorouracil in the stem structure. From Chu et al.69i Courtesy of Jack Horowitz. (C) A 31P NMR spectrum of a synthetic 14 base-pair DNA segment related to the E. coli lac operator. The palindromic sequence is TCTGAGCGCTCAGA. The numbers refer to the positions from the 5 end. From Schroeder et al.688... 

Ionic strength influences are well known with respect to the rate and energetics of nucleic acid hybridization [17]. Charge and ionic radius are both important in terms of stabilizing the structure of the duplex as well as stabilizing the stem portion of the molecular beacon [17]. The stem structure stability was increased when a divalent cation was incorporated into the hybridization buffer solution [17]. It was reported that cations were best at stabilizing the duplex formed upon hybridization in the order Ca2+ > Mg2+ K+ > Na+. The ultimate detection limit of the sensor configuration was calculated to be 1.1 nM [17]. 

K. Hatanc, M. Kqjima, M. Tanokura, and K, Takahaihi. Solution structure of bromelain inhibitor VI from pineapple stem structural similarity with Bawmnn-Birk hyprin/chymotrypsin inhibitor from soybean. Biochemistry J5 5379 (1996). 

Stems support the plant, usually above the ground, and contain the various specialized tissues that transport nutrients and moisture. Some stem structures are prostrate or below ground, like corms and rhizomes, which store energy (food). Wood is the term used to describe dense, often large stems of some plants. 

Molecular DNA probes that are chain-loop-and-stem structures. A fluorophore at the... 

All vegetable fibres other than cotton are multicellular. They are composed of bundles of many cells held together by surface attraction. They are not attached to seeds as are cotton hairs but are usually part of the stem structure or some other tissue of the plant. 

Cyclobenzaprine is a centrally acting skeletal muscle relaxant that relieves skeletal muscle spasms of local origin without interfering with muscle function by acting within the CNS at the brain stem. Structurally and pharmacologically related to tricyclic antidepressants, cyclobenzaprine is indicated in the relief of muscle spasms associated with acute painful musculoskeletal conditions. 

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