نتایج جستجو برای: bioavailable p
تعداد نتایج: 1272614 فیلتر نتایج به سال:
CONTEXT The relationship between sex steroids and fracture is poorly understood. OBJECTIVE The objective of the study was to examine associations between nonvertebral fracture risk and bioavailable estradiol (bioE2), bioavailable testosterone (bioT), and SHBG. DESIGN This was a case-cohort study. SETTING The Osteoporotic Fractures in Men Study (MrOS) was conducted in a prospective U.S. co...
The biotransformation of benzaldehyde and glucose to L-phenylacetylcarbinol (PAC) using Candida utilis was demonstrated in a solid-liquid two-phase partitioning bioreactor (TPPB) with the aim of reducing substrate, product, and by-product toxicity via sequestration. Previous work in the field had used octanol as the sequestering phase of liquid-liquid TPPBs but was limited by the toxic effects ...
BACKGROUND Cancer can lead to weight loss, anorexia, and poor nutritional status, which are associated with decreased survival in cancer patients. METHODS Male cancer patients (n = 136) were followed for a mean time of 4.5 years. Variables were obtained at baseline: cancer stage, albumin, hemoglobin, tumor necrosis factor alpha (TNF-α), interleukin (IL)-6, bioavailable testosterone, appetite ...
Phosphorus is an essential element for life, and the phosphorous cycle widely believed to be a key factor limiting extent of Earth's biosphere its impact on remotely detectable features atmospheric chemistry. Continental weathering conventionally considered only source bioavailable phosphorus marine biosphere, with submarine hydrothermal processes acting as sink. Here, we use novel 29Si tracer ...
BACKGROUND Bioavailable testosterone (BT), circulating testosterone not bound to sex hormone-binding globulin (SHBG), is thought to easily penetrate cells. We compared BT measurements obtained by assays with those obtained by calculation with different testosterone association constants. METHODS We obtained sera from 2 groups of hypogonadal men [group 1 (G1), 1421 samples; group 2 (G2), 170 s...
Understanding insulin-like growth factor-1 (IGF1) biology is of particular importance because, apart from its role in mediating growth, it plays key roles in cellular transformation, organ regeneration, immune function, development of the musculoskeletal system and aging. IGF1 bioactivity is modulated by its binding to IGF-binding proteins (IGFBPs) and the acid labile subunit (ALS), which are p...
Understanding how plant functional traits shape nutrient limitation and cycling on land is a major challenge in ecology. This is especially true for lowland forest ecosystems of the tropics which can be taxonomically and functionally diverse and rich in bioavailable nitrogen (N). In many tropical regions, however, diverse forests occur side-by-side with monodominant forest (one species >60% of ...
Arsenic geochemistry in three soils contaminated with sodium arsenite pesticide: An incubation study
The potential for human exposure to arsenic (As), a group A carcinogen, has increased tremendously because of the encroachment of suburban areas into former agricultural lands, where arsenical pesticides were used extensively prior to the 1990s. Many baseline risk assessments of As-enriched sites assume that all (100%) As present in the soil is bioavailable because of the high expenses and logi...
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