BACKGROUND Studies investigating the relationship between plasma total homocysteine (tHcy) and vascular disease usually rely on a single measurement. Little information is available, however, on the seasonal variability of plasma tHcy. The aim of this study was to investigate the seasonal variation in fasting plasma tHcy and related B-vitamin intake and status in a group of people who did not c...

The effect of a potential probiotic on the growth performance of a rotifer and its inhibition against Vibrio anguillarum was studied. Probiotic strain AR21 had no significant observable effect on the growth rate of rotifers under optimal culture conditions in three consecutive experiments. In the first and second experiments, the AR21 strain exhibited an inhibitory effect against the V. anguill...

BACKGROUND A variety of studies have noted seasonal variation in blood lipid levels. Although the mechanism for this phenomenon is not clear, such variation could result in larger numbers of people being diagnosed as having hypercholesterolemia during the winter. METHODS We conducted a longitudinal study of seasonal variation in lipid levels in 517 healthy volunteers from a health maintenance...

Zooplankton organisms with short generation times, such as rotifers, are ideal models to study general ecological and evolutionary questions on the population level, because meaningful experiments can often be completed within a couple of weeks. Yet biological analysis of such populations is often extremely time consuming, owing to abundance estimation by counting, measuring body size, or deter...

21 Growth hormone (GH, 0.0025 and 0.025 I.U. ml ) and g-aminobutyric acid (GABA, 50 mg 21 ml ) enhance rotifer population growth in batch cultures. In order to further understand the mechanism of their actions, we conducted experiments culturing isolated females at low food and 6 high free ammonia levels. At an optimum food level of 7 3 10 Nannochloropsis oculata cells 21 21 ml or at low free a...

Background & Aim: Achillea filipendulina is one of the most important species of the family Asteraceae and, it considered as one of the most valuable medicinal and ornamental plants. Environmental factors affected on quality and quantity of the essential oil of medicinal and aromatic plants. So, selecting of appropriate season for harvesting can lead to increase quality and quantity yi...

A study was conducted to determine the copper status of different classes of grazing sheep during twodifferent seasons on a farm located in southern Punjab, Pakistan. A complete free-choice supplement wasavailable to all animals throughout the year. Soil, forage and blood plasma from animals were taken eighttimes during the year (2005) (four times in both summer and winter seasons). Soil Cu2+ w...

Background Effect of seasonal changes in human reproduction has been intensively researched. Some studies acknowledge influences of seasonal variation on natural conception, while others can not confirm them. The aim of this study was to investigate the effect of seasonal changes on different stages of assisted reproductive technology (ART) in Tehran. MaterialsAndMethods This study was carried ...

Floods can change the physicochemical factors of water body and zooplankton community. In summer 2020, Huayanghe Lake experienced floods. Here, eight cruises were conducted in from 2020 to 2022 study response environmental community The results demonstrated that floods increased concentrations total nitrogen, phosphorus chlorophyll a. addition, during floods, number rotifer species increased, w...

the main objective of a research program, whose output is presented here, has been to estimate “ventilation coefficients”, a critical parameter in determining air pollution concentration near the surface ground which signifies the ability for natural ventilation of an air shed in an urban or rural area. relevant measured data from the city of tehran has been used to calibrate and further de...