introduction: sperm cryopreservation is widely used as a way of preserving the male sperm used in future artificial insemination and fertilization. despite all the recent advances in cryopreservation technology, sperm motility is negatively affected by freezing and the thawing afterwards. yet hyaluronic acid is believed to improve the vitality and motility of the sperm, enhancing the physiologi...

A multifunctional additive based on a gel-like dispersion of taunitic carbon nanomaterial (CNM) is considered. The influence its quantitative composition the physical and mechanical properties fine-grained concrete studied. results study frost resistance enriched with CNM "Taunit" are presented.The main hypotheses describing formation porous structure under action alternate freezing thawing con...

Since James Thomson et al developed a technique in 1998 to isolate and grow hES in culture, freezing cells for later use and thawing and expanding cells from a frozen stock have become important procedures performed in routine hES cell culture. Since hES cells are very sensitive to the stresses of freezing and thawing, special care must taken. Here we demonstrate the proper technique for rapidl...

We report on the preparation of both porous and non-porous poly(vinyl alcohol) (PVA) hydrogels that can be used as carriers to release proteins. Non-porous gels were prepared by freezing and thawing of aqueous PVA solutions, while porous gels were formed by adding porosigens such as NaCl or ammonium carbamate into aqueous PVA solutions. Bovine serum albumin, a model protein, was loaded into non...

Resistance of Plasmodium falciparum to drugs such as chloroquine and sulfadoxine-pyrimethamine is a major problem in malaria control. Artemisinin (ART) derivatives, particularly in combination with other drugs, are thus increasingly used to treat malaria, reducing the probability that parasites resistant to the components will emerge. Although stable resistance to artemisinin has yet to be repo...

It is well known that the characteristics of concrete components greatly affect the durability of high strength/high performance (HS/HP) concrete against frost action. Undoubtedly, precise recognition of this relationship leads &#10to appropriate selection of the type and proportions of concrete components in any particular project. In the current study, the aim is to investigate the possibilit...

It is well known that the characteristics of concrete components greatly affect the durability of high strength/high performance (HS/HP) concrete against frost action. Undoubtedly, precise recognition of this relationship leads to appropriate selection of the type and proportions of concrete components in any particular project. In the current study, the aim is to investigate the possibility ...

Reactive oxygen species (ROS) generation, induced by the cryopreservation process, can be responsible for mammalian sperm damage. Curcumin is known as an effective antioxidant against oxidative stress. The aim of this study was to evaluate the effects of curcumin on sperm count, motility and viability, semen total antioxidant capacity and DNA integrity of rat spermatozoa during semen freeze-tha...

This paper presents an experimental investigation to identify suitable indices assess durability of glulam when subjected freeze-thaw cycles in exposed enviroenment. In this study, two types specimens were tested for their performance different levels aging due freezing and thawing. Effect treatment on various parameters including thickness swelling rate, static bending strength, elastic modulu...