The bacterium Myxococcus xanthus has two motility systems: S motility, which is powered by type IV pilus retraction, and A motility, which is powered by unknown mechanism(s). We found that A motility involved transient adhesion complexes that remained at fixed positions relative to the substratum as cells moved forward. Complexes assembled at leading cell poles and dispersed at the rear of the ...

The present work describes experiments undertaken to evaluate the usefulness of selected physicochemical indices of semen, cell membrane integrity and sperm chromatin structure for the assessment of boar semen sensitivity to processes connected with pre-insemination procedures. The experiments were carried out on 30 boars: including 15 regarded as providers of sensitive semen and 15 regarded as...

objective(s):althoughroutinely applied in assisted reproductive technology, human sperm cryopreservation is not a completely successful procedure. adverse effects of cryopreservation on the fertilization capacity, motility, morphology, and viability of spermatozoa have been proven; cryopreservation has also shown a role in sperm dna fragmentation and infertility. the post-thaw survival of sperm...

introduction: pyrethroids are important insecticides because of their high activity and low mammalian toxicity. some studies have demonstrated that these insecticides, especially compounds with an -cyano group, produce toxic effects on various biological systems. deltamethrin (dtm) is a type ii synthetic pyrethroid insecticide containing -cyano group and is used worldwide in agriculture, home...

background: to determine any correlation between infertility and semen quality with concentrations of l-carnitine in human seminal plasma. methods: this case-control study performed in fatemieh hospital in hamadan, iran. seminal plasma of 72 infertile men and 80 men with proved fertility as a control group was investigated and l-carnitine level was determined using uv enzymatic test at 340 nm. ...

background nonalcoholic fatty liver disease (nafld) is the most common cause of chronic liver disease in western world. however, nafld shows an increasing trend in china every year, which has attracted the attention of national health authorities. the previous studies have shown that nafld caused severe gastrointestinal motor disorders, but little is known about the interstitial cells of cajal ...

background: recurrent spontaneous abortion impacts almost 1% of couples. the sera from women with unexplained recurrent spontaneous abortion (ursa) have toxic effects on embryos that grow in the uterus. therefore, the abnormal condition of the uterus may also affect sperm qualities. objective: the objectives of this study were to search if these sera could induce dna denaturation in sperm nucle...

objective(s): increased levels of nitric oxide (no) in the testicular veins of people suffering from varicocele have already been reported. however, the role of no-synthase (nos) isozymes and their inhibitors have not been extensively studied. we aimed to evaluate the inhibitory effects of aminoguanidine (ag), on sperm motility, vitality, and mitochondrial membrane potential (mmp) in varicoceli...

introduction: artemisia dracunculus l. belongs to asteraceae family, and is a medicinal plant widely used in traditional medicine as a remedy for gastrointestinal disturbances. this study was undertaken to evaluate the effects of essential oil of a. dracunculus (eoad) on the rat alimentary tract. methods: the eoad was extracted by clevenger apparatus using hydrodistillation. ld50 was calculated...