Data Sharing using BFID Encryption for Privacy Preseration of Data in Cloud

The most important functionality in cloud storage is data sharing. With the advent of cloud computing [1], data owners are motivated to outsource their complex data management systems from local sites to the commercial public cloud for great flexibility and economic savings. But for protecting data privacy and integrity, sensitive data have to be encrypted before outsourcing, which causes the need of traditional data utilization based on plaintext keyword search. Thus, enabling an encrypted cloud data search service is of paramount importance.Typically cloud computing is a combination of computing recourses accessible via internet. Historically the client or organizations store data in data centers with firewall and various security techniques used to protect data against intrudes to access the data. Since the data was contained to data centers in limits of organisation, the control over the data was more and well defined procedures could be used for accessing its own data. Howeverin cloud computing, since the data is stored anywhere across the world, the client organizations have less control over the stored data.Identity-Based Encryption (IBE) which is used to simplifies the public key and certificate management at Public Key Infrastructure (PKI) is an important alternative to public key encryption. Identity-based encryption (IBE) is an important aspect of ID-based cryptography. As such it is a type of public-key encryption in which the public key of a user is provides unique information about the identity of the user (e.g. a user's Identification). This can use the text-value of the name or domain name as a key or the physical IP address it translates to

PROTECTION AGAINST ENDOTHELIAL DYSFUNCTION BY PIOGLITAZONE AND IRBESARTAN IN FRUCTOSE-FED DIABETIC RATS

ABSTRACT The protective effects of metformin, pioglitazone, irbesartan, ramipril; and their combinations against oxidative stress and endothelial dysfunction in the aortic tissues in type-2 diabetic rats were investigated. Metformin (350 mg/kg, p.o.), pioglitazone, irbesartan, and ramipril (10 mg/kg, p.o.); and their combinations were administered for a period of 6 weeks after induction of type-2 diabetes by fructose (66% w/v, p.o.) in rats. The effects were examined on body weight, serum glucose, triglyceride, cholesterol, blood pressure (BP) and heart rate. At the end of treatments, vascular reactivity was tested with catecholamines. Acetylcholine and sodium nitroprusside-induced vasorelaxation was measured on isolated rat aortas. The oxidative stress indices were determined. Chronic treatment with drugs significantly decreased weight gain, serum glucose, triglyceride, cholesterol levels; normalize the heart rate and BP in fructose fed rats. All the treatments significantly reduced the pressor response to catecholamines. The significant improvement in the relaxant response to acetylcholine and sodium nitroprusside was obtained on isolated aortas. Furthermore, treatments were effective in restoring defensive antioxidant enzymes. Metformin, pioglitazone, irbesartan, and Ramipril; and their combinations were able to reverse oxidative stress and vascular endothelial dysfunction. Combination of pioglitazone with irbesartan has shown better ameliorating potential

Dissolution and crystallization of polyamides in superheated water and concentrated ionic solutions

The dissolution and recrystallization of Polyamide 46 (PA46) from superheated (i) water and (ii) concentrated ionic solutions of strong solubilizing mono- and divalent Hofmeister ions are studied, utilizing in situ high-resolution magic-angle spinning (HR-MAS) nuclear magnetic resonance (NMR) supported by wide-angle X-ray diffraction (WAXD), attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), and gel permeation chromatography (GPC). The samples are sealed in glass capillaries, and employing variable-temperature H-1 HR-MAS NMR spectroscopy, the dissolution process of PA46 as a function of temperature and pressure can be followed in situ. The purpose of such a study is to obtain molecular insight into the dissolution process of these hydrogen-bonded synthetic polymers in the different aqueous solutions. In pure water, at temperatures close to the dissolution of PA46, two distinct H-1 resonances from water are observed. These resonances are associated with water molecules in the vicinity of PA46 and water in the bulk state. On further heating, the signal from water molecules in the vicinity of PA46 dominates. This sudden change in the environment suggests that water molecules, which have escaped the dense hydrogen-bonded network of bulk water, can diffuse into the structure of PA46, triggering dissolution of the polymer. This happens at a temperature that is more than 100 degrees C below the melting temperature of the polymer, notably without hydrolysis as verified by GPC performed prior to and after the dissolution experiments. On cooling, recrystallization of PA46 from, aqueous solution is observed where water molecules are incorporated in the crystal structure. In the presence of salts, such as LiI and Cal(2), weakening of the hydrogen-bonding network of the water molecules occurs. However, above room temperature, independent of the choice of salt, depopulation of the hydrogen bonding between the water molecules occurs, observed as a decrease in the H-1 chemical shift value. The reduced hydrogen bonding in the presence of ions facilitates the dissolution of PA46 at much lower temperatures compared to pure water and ultimately results in the complete suppression of crystallization from solution even at room temperature. Depending on the valency of the cation a more mobile or frozen amorphous state of PA46 is obtained at low temperatures as verified by C-13 HR-MAS NMR, ATR-FTIR, and WAXD

Polyamides with reduced crystallinity

The invention relates to a novel process for making compositions comprising a polyamid, water and a salt, having reduced crystallinity, wherein the process comprising the steps of: a. mixing the polyamide, water and a salt b. heating the mixture to a temperature in a range between 120 °C below the Brill temperature and 50 °C above the Brill temperature of the polyamide c. optionally cooling down the mixture. Preferably in step b the water is heated under pressure to a temperature above 100 °C

Nucleating agents for biopolymers

Use of a compound or a combination of compounds for crystallization of polyhydroxy-alkanoate (PHA), poly-lactic acid (PLA) or combinations thereof, characterized in that each of said compounds comprises a core motif with two oxalamide motifs, flanked by two arms, wherein said core motif has the formula: R-NH-C(O)-C(O)-NH-(CH2)n-NH-C(O)-C(O)-NH-R', wherein n is between 1 and 10 and the arms R and R' are each independently of one another chosen from: (i) H; (ii) an alkyl group with a total number of carbon atoms between 1 and 20; (iii) an aromatic ring; or (iv) an ester group as e.g. - X-Ester-Y, or - X-Ester- X-Ester-Y, wherein X is a saturated aliphatic hydrocarbon group comprising 1 to 20 carbon atoms, Y is chosen from H, an alkyl group with a total number of carbon atoms between 1 and 20 or an aromatic ring and Ester is -C(O)-O- or -O-C(O)-