The water molecule

This study aimed to design a nanocarrier system for the efficient delivery of poorly soluble drugs in cancer treatment. Nanogel systems were prepared from copolymers of Heparin and different Pluronics, in which the Hep-Plu conjugates were formed via disulfide bridges of cystamine molecules. The obtained Hep-Plu systems were proved and characterized using specific techniques including H-NMR, zeta potential, DLS and FT-IR.

8p dianmotminh02 03-05-2024 2 1   Download

Biodegradable “green” and safe substitutes to minimize environmental and health risks are drawing extensive attention for research interest. This research aims to create a water-soluble cationic starch-grafted biodegradable polymer that can be used as a flocculant. As polymers are strong molecules that carry charges, they are effective flocculants. Saturated polymer chains do not change the pH value on adding to wastewater.

8p dianmotminh02 03-05-2024 3 1   Download

The microdynamic mechanism of the phenomenon, which the static permittivity of sodium chloride aqueous solution with concentration of 2.8 mol/L holds constant with the change of temperature, is clarified. The equilibrium compensation between the decrement of the permittivity part due to the water molecular polarization and the increase of that originated from the ionic polarization as increasing temperature is responsible for this phenomenon. The dipole moment reduction of water molecules as rising temperature is also confirmed by the model.

6p dianmotminh02 03-05-2024 2 1   Download

Ebook "Principles of food chemistry (Fourth edition)" was designed to serve as an introductory text for courses in food chemistry as part of food science programs meeting the Institute of Food Technologists standards. The original concept for the preparation of this book was to present basic information on the composition of foods and the chemical and physical characteristics they undergo during processing, storage, and handling.

614p tracanhphuonghoa1007 22-04-2024 10 2   Download

In ebook "Spectroscopic investigations of hydrogen bond network structures in water clusters" the properties and nature of water clusters studied with novel spectroscopic approaches are presented in this thesis. Following a general introduction on the chemistry of water and water clusters, detailed descriptions of the experiments and analyses are given. All the experimental results, including first size-selective spectra of large clusters consisting of 200 water molecules, are presented with corresponding analyses.

186p coduathanh1122 27-03-2024 2 1   Download

Ebook "Fluorescence of supermolecules, polymers, and nanosystems" which is the fourth in the Springer Series on Fluorescence, collects articles written by speakers of the 9th International Conference on Methods and Applications of Fluorescence: Spectroscopy, Imaging and Probes (MAF 9), held in Lisbon, Portugal, in September 2005, along with a few invited articles. The meeting, with more than 300 participants from 33 countries, included 18 plenary and invited lectures.

468p manmanthanhla0201 27-02-2024 4 2   Download

Ebook "An introduction to the physical chemistry of food" introduces the physical chemistry essential to understanding the behavior of foods. Starting with the simplest model of molecules attracting and repelling one another while being moved by the randomizing effect of heat, the laws of thermodynamics are used to derive important properties of foods such as flavor binding and water activity.

192p nhanphanguyet 28-01-2024 4 2   Download

Ebook "Mechanism of functional expression of the molecular machines" discusses the mechanism of functional expression of a protein or protein complex utilizing the ATP hydrolysis cycle or proton-motive force from a unique point of view focused on the roles of water. A pivotal factor is the entropic force or potential originating from the translational displacement of water molecules coexisting with the molecular machines in the entire system.

77p lamquandat 28-12-2023 2 2   Download

Part 1 book "Animal physiology" includes content: Animals and environments: function on the ecological stage; molecules and cells in animal physiology; genomics, proteomics, and related approaches to physiology; physiological development and epigenetics; transport of solutes and water,... and other contents.

534p oursky05 20-09-2023 2 1   Download

Lecture Physical science: Chapter 7 provide students with content about: most materials are mixtures; the chemist’s classification of matter; solutions; solubility; soaps, detergents, and hard water; purifying the water we drink; wastewater treatment;... Please refer to the detailed lecture content!

22p diepkhinhchau 18-09-2023 3 3   Download

We study the proton conductivity properties of MOF-801. We find that MOF-801 possesses intrinsic proton carrier sites, m3-OH groups, in clusters yielding the generation of hydrogen-bonding networks with guest water molecules at high relative humidity (RH), facilitating proton transport.

7p viberbers 09-08-2023 3 3   Download

Large scale production of H2, a clean fuel, can be realized with just water and solar light energy by employing a viable energy conversion device called artificial leaf. In this tutorial review, we discuss on advances achieved recently and technical challenges remained toward the creation of such a leaf.

19p viberbers 09-08-2023 6 4   Download

Toll-like receptors play a key role in innate immunity by recognizing pathogens and activating appropriate responses. Pathogens express several signal molecules (pathogen-associated molecular patterns, PAMPs) essential for survival and pathogenicity. Recognition of PAMPs triggers an array of anti-microbial immune responses through the induction of various inflammatory cytokines.

8p vinarcissa 21-03-2023 4 1   Download

We performed a theoretical study, at the BLYP/aug-cc-pVDZ theoretical level, of the mechanisms of H-transfer between biologically relevant tautomers of cytosine and guanine. The analysis of the ground- and excited state energy barriers of the conversions showed that in some cases they are lower as compared to the ground state reactions. The inclusion of one water molecule as a catalyst in the oxo-amino form of cytosine and guanine drastically changes the mechanism of the reactions in the ground as well as in the excited state.

9p lyhuyenthu 31-01-2023 5 2   Download

Tryptophan (Trp) decorated hydroxypropyl methylcellulose (HPMC) cryogels were prepared by a one-step reaction with citric acid. The increase of Trp content in the 3D network from 0 to 2.18 wt% increased the apparent density from 0.0267 g.cm−3 to 0.0381 g.cm−3 and the compression modulus from 94 kPa to 201 kPa, due to hydrophobic interactions between Trp molecules.

10p viginny 30-12-2022 10 2   Download

The interaction between small molecules and neutral soluble dietary fiber is one of the proposed mechanisms determining the bioavailability of these components in the small intestine. However, the weak nature of these interactions makes it difficult to find an analytical method sensitive enough to detect them.

11p viginny 30-12-2022 6 2   Download

A fast determination of acidity constants (pKa) of very insoluble drugs has become a necessity in drug discovery process because it often produces molecules that are highly lipophilic and sparingly soluble in water. In this work the high throughput internal standard capillary electrophoresis (IS-CE) method has been adapted to the determination of pKa of water insoluble compounds by measurement in methanol/aqueous buffer mixtures.

10p viginny 23-12-2022 8 3   Download

As a new family of functional porous materials, conjugated porous polymers (CPPs) with tuneable porosities and molecular architectures show great potentials in adsorption, light harvesting, and catalysis applications. This paper describes the incorporation of strong visible-light absorbing BODIPY molecules into the skeleton of CPPs via Sonogashira coupling reactions.

8p vironald 15-12-2022 5 2   Download

The removal of Sr, Cd, and Pb from nuclear and industrial waste is important as these are harmful to living organisms and the environment. Immobilization of these ions in a zeolite framework is a simple and suitable method. However, zeolites are easily dehydrated at high temperatures.

7p vironald 15-12-2022 7 2   Download

(CH3)3Al (TMA) has been employed for preparation of various thin films. It is also known to be hypergolic in the air. To unveil the hypergolic phenomenon, the mechanism for the reaction of TMA with O2 and/or H2O molecules is studied using computational quantum methods. Our results show that TMA reacts with water much faster than with O2, and water is not an efficient catalyst to help O2 reacting with TMA. The reactions of TMA with water and oxygen molecules can undergo subsequent ones in the air.

5p runordie3 27-06-2022 9 2   Download