[Role of neuropeptide substance P and the bone morphogenetic protein signaling pathway in osteogenic differentiation of ST2 cells].

Objective: This study aimed to investigate the role and mechanism of neuropeptide substance P (SP) in ST2 cell (bone mesenchymal stem cells of mice) osteogenic differentiation to provide a basis for the treatment of temporomandibular joint osteoarthritis.

Methods: Third-generation ST2 cells were cultured with different concentrations of SP (0, 10⁻¹⁰, 10⁻⁸, 10⁻⁶, and 10⁻⁵ mol·L⁻¹). After 24, 48, and 72 h, cell proliferation was detected by CCK-8.

Application of Five Light-Response Models in the Photosynthesis of Populus × Euramericana cv. 'Zhonglin46' Leaves.

The light-response curve of photosynthesis is an important tool used to study plant ecophysiology and can provide a scientific basis for the response of plant photosynthetic characteristics to environmental factors. At present, there are five common light-response models of photosynthesis. To gain deeper insight into the applicability of different light-response models of photosynthesis and the photosynthetic physiological characteristics of Populus euramericana cv.

Effect of continuous cropping generations on each component biomass of poplar seedlings during different growth periods.

In order to investigate the change rules and response characteristics of growth status on each component of poplar seedling followed by continuous cropping generations and growth period, we clear the biomass distribution pattern of poplar seedling, adapt continuous cropping, and provide theoretical foundation and technical reference on cultivation management of poplar seedling, the first generation, second generation, and third generation continuous cropping poplar seedlings were taken as study objects, and the whole poplar seedling was harvested to measure and analyze the change of each component biomass on different growth period poplar leaves, newly emerging branches, trunks and root system, and so forth. The results showed that the whole biomass of poplar seedling decreased significantly with the leaf area and its ratio increased, and the growth was inhibited obviously. The biomass aboveground was more than that underground.

Spatial distribution of soil organic carbon and total nitrogen based on GIS and geostatistics in a small watershed in a hilly area of northern China.

The spatial variability of soil organic carbon (SOC) and total nitrogen (STN) levels is important in both global carbon-nitrogen cycle and climate change research. There has been little research on the spatial distribution of SOC and STN at the watershed scale based on geographic information systems (GIS) and geostatistics. Ninety-seven soil samples taken at depths of 0-20 cm were collected during October 2010 and 2011 from the Matiyu small watershed (4.

[CO2 response process and its simulation of Prunus sibirica photosynthesis under different soil moisture conditions].

Taking the two-year old potted Prunus sibirica seedlings as test materials, and using CIRAS-2 photosynthetic system, this paper studied the CO2 response process of P. sibirica photosynthesis in semi-arid loess hilly region under eight soil moisture conditions. The CO2 response data of P.

Influence of sub-surface irrigation on soil conditions and water irrigation efficiency in a cherry orchard in a hilly semi-arid area of northern China.

Sub-surface irrigation (SUI) is a new water-saving irrigation technology. To explore the influence of SUI on soil conditions in a cherry orchard and its water-saving efficiency, experiments were conducted from 2009 to 2010 using both SUI and flood irrigation (FLI) and different SUI quotas in hilly semi-arid area of northern China. The results demonstrated the following: 1) The bulk density of the soil under SUI was 6.

[Responses of Cotinus coggygria var. cinerea photosynthesis to soil drought stress].

By using a portable photosynthetic system (CIRAS-2), this paper studied the photosynthetic characters of 3-year-old Cotinus coggygria var. cinerea under effects of different soil water regime (enough supply, light stress, medium stress, and heavy stress) and light intensity. Soil water regime had significant effects on the photosynthetic parameters of C.

[Response processes of Aralia elata photosynthesis and transpiration to light and soil moisture].

By using CIRAS-2 portable photosynthesis system, the light response processes of Aralia elata photosynthesis and transpiration under different soil moisture conditions were studied, aimed to understand the adaptability of A. elata to different light and soil moisture conditions. The results showed that the response processes of A.

[Growth process and diameter structure of Pinus tabulaeformis forest for soil and water conservation in Loess Plateau Hilly regions].

Through stem analysis of sample trees, the biomass, growth process, and diameter structure of two 21 years old Pinus tabulaeformis forests growing on the shady and sunny slopes in Loess Plateau hilly and gully regions were investigated. The results showed that there were distinct differences between these two forests in their tree height, diameter at breast height (DBH), and timber volume. The forest biomass, growth status, and diameter structure on shady slope were superior to those on sunny slope.

[Light response of Wisteria sinensis leaves physiological parameters under different soil moisture conditions].

With two years old Wisteria sinensis as test material, this paper measured the light response of its leaves net photosynthetic rate (Pn), transpiration rate (Tr) and water use efficiency (WUE) under different soil moisture conditions, aimed to ascertain the optimal soil moisture and light conditions of W. sinensis growth. The results showed that the Pn, Tr and WUE had evident threshold responses to the variations of soil moisture and light intensity.

[Grading of Robinia pseudoacacia and Platycladus orientalis woodland soil's water availability and productivity in semi-arid region of Loess Plateau].

With Li-6200 photosynthesis determination system and Li-1600 steaty state poro-meter, this paper studied the responses of Robinia pseudoacacia L. and Platycladus orientalis L. leaves' net photo-synthesis rate (Pn), carboxylation efficiency (CE), transpiration rate (Tr), water use efficiency (WUEL), stomata conductance (Cs), stomata resistance (Rs), intercellular CO2 concentration (Ci) and stomatal limitation (Ls) of Robinia pseudoacacia and Platycladus orientalis leaves to soil water content (SWC) in semi-arid region of Loess Plateau, and based on this, the soil water availability and its productivity of test woodland soils were graded and evaluated.