scholarly journals Dynamics of hydrogen bonds in the secondary structures of allosteric protein Avena Sativa phototropin 1

2021 ◽  
Author(s):  
Mayar Tarek Ibrahim ◽  
Francesco Trozzi ◽  
Peng Tao
Keyword(s):  
Hydrogen Bonds ◽  
Avena Sativa ◽  
Secondary Structures ◽  
Allosteric Protein

scholarly journals β-Glutamine-mediated self-association of transmembrane β-peptides within lipid bilayers

2016 ◽  
Vol 7 (9) ◽  
pp. 5900-5907 ◽  
Author(s):  
U. Rost ◽  
C. Steinem ◽  
U. Diederichsen
Keyword(s):  
Hydrogen Bonds ◽  
Lipid Bilayers ◽  
Rational Design ◽  
Secondary Structures ◽  
Design And Synthesis ◽  
Self Association

The rational design and synthesis of novel transmembrane β-peptides forming stable secondary structures in a membrane environment are described. Their state of aggregation within the membrane is controlled by hydrogen bonds.

Stabilization of the i-motif by intramolecular adenine–adenine–thymine base triple in the structure of d(ACCCT)

1999 ◽  
Vol 55 (2) ◽  
pp. 422-429 ◽  
Author(s):  
Jonathan Weil ◽  
Tongpil Min ◽  
Cheng Yang ◽  
Shuren Wang ◽  
Cory Sutherland ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Local Structure ◽  
Secondary Structures ◽  
Water Molecules ◽  
Molecular Replacement ◽  
Base Pairing ◽  
Adenine Base ◽  
Adenine Thymine

The crystal structure of d(ACCCT), solved by molecular replacement, shows a four-stranded i-motif conformation, where two parallel duplexes intercalate with one another in opposite orientations. Each duplex is stabilized by hemi-protonated C–C+ base pairing between parallel strands, and a string of water molecules bridge the cytosine N4 atoms to phosphate O atoms. This structure of d(ACCCT) shows examples of reversed Hoogsteen and Watson–Crick base pairing in both intermolecular and intramolecular manners to stabilize the tetraplex. Noticeably, the four-stranded complex is further stabilized at one end by a three-base hydrogen-bonding network, in which two adenines and a thymine form four hydrogen bonds via a reverse Hoogsteen and an asymmetric adenine–adenine base pairing. The structure of d(ACCCT) shows a similar local structure to that found in the d(TAA) part of the crystal structure of d(TAACCC) and provides further structural evidence that these base arrangements are essential for stabilizing these novel DNA super-secondary structures.

SEM Cold Stage Techniques for the Observation of Vegetative and Floral Apices of Oat (Avena sativa L.) Plants

1977 ◽  
Vol 35 ◽  
pp. 590-591
Author(s):  
B. K. Kirchoff ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Critical Point ◽  
Avena Sativa ◽  
Substantial Improvement ◽  
Fresh Tissue ◽  
Cold Stage ◽  
Critical Point Drying ◽  
Almost All ◽  
Cell Collapse ◽  
Conductive Paint ◽  
Carbon Based

In attempting to use the SEM to investigate the transition from the vegetative to the floral state in oat (Avena sativa L.) it was discovered that the procedures of fixation and critical point drying (CPD), and fresh tissue examination of the specimens gave unsatisfactory results. In most cases, by using these techniques, cells of the tissue were collapsed or otherwise visibly distorted. Figure 1 shows the results of fixation with 4.5% formaldehyde-gluteraldehyde followed by CPD. Almost all cellular detail has been obscured by the resulting shrinkage distortions. The larger cracks seen on the left of the picture may be due to dissection damage, rather than CPD. The results of observation of fresh tissue are seen in Fig. 2. Although there is a substantial improvement over CPD, some cell collapse still occurs.Due to these difficulties, it was decided to experiment with cold stage techniques. The specimens to be observed were dissected out and attached to the sample stub using a carbon based conductive paint in acetone.

Use of molecular overlap to predict intermolecular repulsion in N... H-O hydrogen bonds

1998 ◽  
Vol 95 (3) ◽  
pp. 525-537 ◽  
Author(s):  
I. NOBELI S. L. PRICE R. J. WHEATLEY
Keyword(s):  
Hydrogen Bonds

On symmetrical O-H-O hydrogen bonds

1964 ◽  
Vol 25 (5) ◽  
pp. 487-492 ◽  
Author(s):  
R.E. Rundle
Keyword(s):  
Hydrogen Bonds

PPARα and PPARβ/δ Activation by Oat (Avena sativa) Oil Stimulates Keratinocyte Differentiation and Ceramide Synthesis

Planta Medica ◽  
2013 ◽  
Vol 79 (10) ◽  
Author(s):  
S Chon ◽  
R Earland ◽  
A Pappas ◽  
KA Reynertson ◽  
MD Southall
Keyword(s):  
Avena Sativa ◽  
Keratinocyte Differentiation ◽  
Ceramide Synthesis

Estimación de biomasa aérea de forrajes de invierno bajo riego a través de un dron

2019 ◽  
Vol 12 (4) ◽  
Author(s):  
Francisco Gavi Reyes ◽  
César Botello-Aguillón ◽  
Leonardo Tijerina-Chávez ◽  
Arturo Galvis-Spíndola ◽  
Rodrigo Roblero-Hidalgo
Keyword(s):  
Medicago Sativa ◽  
Avena Sativa ◽  
Medicago Sativa L

E Objetivo: Desarrollar un procedimiento para estimar biomasa con imágenes digitales captadas desde un dron y modelación 3D (ID-Dron-3D) aplicable en alfalfa (Medicago sativa L.) y avena forrajera (Avena sativa L.). Diseño/metodología/aproximación: Con una cámara digital acoplada al dron se obtuvieron imágenes antes de la cosecha de los cultivos, que fueron procesadas con software para luego estimar volumen de biomasa. En cada cultivo se midió altura de la planta y área cosechada, volumen aparente y real de biomasa, y peso de biomasa fresca y seca. Resultados: Con base en el análisis de regresión se obtuvieron modelos lineales a una p<0.05 para predecir: biomasa fresca en avena (R2=0.70) y alfalfa (R2 =0.47); y biomasa seca en avena (R2=0.78) y en alfalfa (R2=0.31) mediante ID-Dron-3D. Limitaciones del estudio/implicaciones: Considerando las R2 de los modelos obtenidos, los resultados en la avena forrajera fueron mejores, respecto a los detectados en alfalfa, lo cual se puede deber a la mayor variabilidad de la cobertura vegetal, ya que, en algunas unidades de muestreo, las plantas de alfalfa no cubrían completamente el suelo. Hallazgos/conclusiones: El rendimiento de biomasa fresca y seca de ambos cultivos se correlacionó significativamente con su respectivo volumen aparente estimado con imágenes digitales tomadas desde un dron y su procesamiento 3D (ID-Dron-3D).

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