Sperm storage via freezing has been useful for men who have difficulty masturbating during assisted reproductive technology (ART) programs and before impotency caused by chemotherapy, vasectomy, and other procedures. Studies were undertaken to evaluate the extent of cryoinjury to sperm after repeated freezing and thawing. The results showed that normozoospermic and oligozoospermic sperm survive...

Angiogenesis, the development and recruitment of new blood vessels, plays an important role in tumour growth and metastasis. Vascular endothelial growth factor (VEGF) is an important stimulator of angiogenesis. Circulating and urinary VEGF levels have been suggested as clinically useful predictors of tumour behaviour, and investigations into these associations are ongoing. Despite recent intere...

Portland cement pervious concrete (PCPC) is increasingly being used in the United States in sidewalks and parking lots due to its benefits in reducing the amount of runoff water and improving water quality. In the United States, PCPC typically has high porosity and low strength, which has resulted in limited use of pervious concrete in hard wet freeze environments (i.e., the Midwest and Northea...

The timing and location of microcracking events, their propagation coalescence to form macrocracks, development by tension, shearing or mixed modes are little known but essential understanding the fracture intact rock freezing thawing. aims present study investigate mechanisms transition macrocracking during repeated freeze-thaw, develop a statistical model crack that assesses distance angular ...

Under the complex working conditions in cold areas, order to achieve health monitoring of engineering structures, carbon fiber and iron tailings sand were added ordinary cement-based materials prepare piezoelectric composites, deterioration their pressure-sensitive properties mechanical under action sulfate-freeze-thaw cycle was studied. Six groups specimens a set benchmark prepared according d...

To develop sensitive detection techniques with the aim of elucidating the life cycle of Marteilioides chungmuensis, an intracellular paramyxean infecting the ovary of the Pacific oyster Crassostrea gigas, we isolated the parasite at the sporont stage from infected oysters using a freeze-thaw procedure at -20 degrees C and differential centrifugations in discontinuous sucrose and Percoll gradien...

A total of 525 cerebrospinal fluid (CSF) samples submitted during the 2007 and 2008 enteroviral seasons were included in a study to determine the prevalence of and potential risk factors for invalid Cepheid GeneXpert enterovirus assay (GXEA) results, as well as possible solutions for the problem. The invalid GXEA results were reported for 43 (8.2%) specimens and correlated with increased visibi...

In the construction project, rock mass is often destroyed from joint plane, and jointed easy to be eroded by freeze-thaw environment. Therefore, damage mechanical properties of filled under action are very important for disaster prevention, engineering safety evaluation reinforcement. order research effect cycle on deterioration characteristics rocks, prefabricated samples tested with different...