724 research outputs found
DataSheet_2_Ocean acidification and food availability impacts on the metabolism and grazing in a cosmopolitan herbivorous protist Oxyrrhis marina.pdf
The heterotrophic dinoflagellate Oxyrrhis marina is an essential microzooplankton in coastal waters, linking the energy transfer from phytoplankton to higher trophic levels. It is of general significance to investigate how it responds and acclimates to ocean acidification (OA), especially under varied availabilities of food. Here, O. marina was exposed and acclimated to three pCO2 levels (LC: 415, MC:1000, HC:1500 μatm) for 60 days, and then was further grown under the CO2 levels with different levels of food (the microalgae Dunaliella salina) availability for about 8 generations. The OA treatments did not significantly hamper its growth and ingestion rates even under the reduced food availability and starvation (deprived of the microalgae), which significantly reduced its growth rate. While the impacts of OA on the growth and ingestion rates of O. marina were insignificant, the OA treatments appeared to have resulted in a faster decline of the heterotrophic dinoflagellate cells during the starvation period. Nevertheless, the acidic stress under the elevated pCO2 of 1000 or 1500 μatm decreased its respiration by about 53% or 59% with the high and by about 26% or 23% with the low food availability, respectively. Such OA-repressed respiration was also significant during the starvation period. On the other hand, the OA treatments and deprivation of the microalgae synergistically reduced the cellular quota of particulate organic C, N and P, resulting in a reduction of food value of the heterotrophic dinoflagellate as prey. In conclusion, our results show that O. marina is highly resilient to future ocean acidification by reducing its respiration and sustaining its ingestion of microalgae.</p
DataSheet_1_Ocean acidification and food availability impacts on the metabolism and grazing in a cosmopolitan herbivorous protist Oxyrrhis marina.pdf
The heterotrophic dinoflagellate Oxyrrhis marina is an essential microzooplankton in coastal waters, linking the energy transfer from phytoplankton to higher trophic levels. It is of general significance to investigate how it responds and acclimates to ocean acidification (OA), especially under varied availabilities of food. Here, O. marina was exposed and acclimated to three pCO2 levels (LC: 415, MC:1000, HC:1500 μatm) for 60 days, and then was further grown under the CO2 levels with different levels of food (the microalgae Dunaliella salina) availability for about 8 generations. The OA treatments did not significantly hamper its growth and ingestion rates even under the reduced food availability and starvation (deprived of the microalgae), which significantly reduced its growth rate. While the impacts of OA on the growth and ingestion rates of O. marina were insignificant, the OA treatments appeared to have resulted in a faster decline of the heterotrophic dinoflagellate cells during the starvation period. Nevertheless, the acidic stress under the elevated pCO2 of 1000 or 1500 μatm decreased its respiration by about 53% or 59% with the high and by about 26% or 23% with the low food availability, respectively. Such OA-repressed respiration was also significant during the starvation period. On the other hand, the OA treatments and deprivation of the microalgae synergistically reduced the cellular quota of particulate organic C, N and P, resulting in a reduction of food value of the heterotrophic dinoflagellate as prey. In conclusion, our results show that O. marina is highly resilient to future ocean acidification by reducing its respiration and sustaining its ingestion of microalgae.</p
Electrospinning PVA/PEI/rGO Fibrous Membrane and Its Adsorption of Cr(VI) and Congo Red in Water
The heavy metal Cr(VI) and azo dye Congo Red are notorious
substances
in wastewater, which must be dealt with effectively. As an adsorbent
for wastewater remediation, a fibrous membrane has ideal advantages,
including high adsorption efficiency, facile separation, and easy
recovery. This study prepared a PVA/PEI/rGO membrane by convenient
mixing and electrospinning for highly efficient adsorption of Cr(VI)
and Congo Red. The microfibrous membrane was characterized by SEM,
TEM, Raman, XRD, and FT-IR techniques. The adsorption kinetics for
Cr(VI) and Congo Red followed the pseudo-second-order kinetic model,
and the adsorption isotherms obeyed the Langmuir model. The maximum
adsorption capacities of the fibrous membrane for Cr(VI) at 298, 308,
and 318 K were 244.99, 304.43, and 337.10 mg/g, respectively, and
for Congo Red were 226.36, 314.16, and 362.63 mg/g, respectively.
Moreover, the adsorbents in five cycles had satisfying adsorption
performance for Cr(VI) and Congo Red. The interactions between the
membrane and adsorbate were explored to disclose the adsorption mechanism.
After adsorption, hypotoxic Cr(III) was detected on the membrane,
originating from the reduction of Cr(VI). Furthermore, the chromium
on the adsorbent could be converted to Cr2O3 by calcination, realizing Cr(VI) recovery in wastewater. This PVA/PEI/rGO
membrane provided a competent adsorbent for wastewater containing
Cr(VI) and Congo Red and shed light on a recovery pathway for Cr(VI)
Association of raised serum progesterone level with ovulation trigger and histology of endometrium in stimulated cycles
Abstract This was a forthcoming study of those patients, who undergo in-vitro fertilization (IVF) and freeze-all embryo, who acquiesce for the study. The number of participated patients (n=350) in this study, underwent for IVF. The blood sample was collected from patients to evaluate the level of serum progesterone in vacuum vials on the day of ovulation trigger. After 36 hrs of ovulation trigger, ovum picked up was done. Quantitative methods were used to estimate the level of serum progesterone through the electrochemiluminescence immunoassay and correlation of serum progesterone with embryo transfer (ET) outcomes. Main outcome of this current study was to evaluate the value of mean serum progesterone level i.e.0.868± 0.712 ng/ml and 0.88±0.723 ng/ml was found in case of pregnancy positive and negative respectively, at p=0.216 value. In antagonist (n=40) and agonist (n=310) cases, it was 8(20%) and 37(11.94%) PL occurrence was noted at p=0.143 respectively. An overall value of the premature lutenization (PL) occurrences was 13.63% and 15.25% observed in both positive and negative cases of pregnancy at p=0.216 respectively. This study concluded that 12.66% of PL occurrences were recorded in the case of IVF. Study results proved, there were no significant effect of PL on pregnancy outcomes.</div
Additional file 1 of Genetic variants in CYP11B1 influence the susceptibility to coronary heart disease
Additional file 1:Â Basic information on SNPs of CYP11B1, clinical characteristics of participants with different SNPs, and false-positive reporting probability of susceptibility
Dopability and Magnetic Properties of 3d Transition Metals in an Atomic-Thick SnTe (001) Monolayer
In this paper, we systematically study the dopability
and magnetic
properties of a 3d TM-doped atomic-thick SnTe(001) monolayer based
on first-principles calculations. It is found that, for separately
distributed TMs in a SnTe(001) monolayer, all of the TMs, except Sc,
Cu, and Zn for the substitutional configuration and Ni, Cu, and Zn
for the adsorption and interstitial configuration, could induce local
magnetic moments. On the other hand, contradictive to the intuition
that TM may adsorb on the SnTe(001) slab, substitution is more favorable.
Even though the formation energy of Ni adsorbed and interstitial in
a SnTe(001) monolayer is comparably low, its local magnetic moment
is 0 as a result of the 3d orbitals fully occupied. Considering both
the low formation energy and large magnetic moment, Mn is expected
to be a prominent choice to introduce magnetism in atomic-thick SnTe
in substitutional configuration. Thus, a pristine flat magnetic SnTe
monolayer is probable to be obtained
S2 Data -
Based on the perspective of performance pressure, we explore the influence of controlling shareholders’ share pledge on excessive financialization behavior of enterprises and its internal mechanism. The results show that the share pledge of controlling shareholders is positively correlated with the excessive financialization behavior of enterprises. After the controlling shareholder’s share pledge, the actual performance of the enterprise is lower than expected, causing the short-sighted behavior of the management, which makes the management willing to conspire with the controlling shareholder to cause the excessive financialization of the enterprise. The results are especially evident among the uncertainty of economic policy is low, the industry competition is not fierce and the executives have overseas experience.</div
Impact of overseas experience of senior executives.
Impact of overseas experience of senior executives.</p
Impact of product market competition.
Based on the perspective of performance pressure, we explore the influence of controlling shareholders’ share pledge on excessive financialization behavior of enterprises and its internal mechanism. The results show that the share pledge of controlling shareholders is positively correlated with the excessive financialization behavior of enterprises. After the controlling shareholder’s share pledge, the actual performance of the enterprise is lower than expected, causing the short-sighted behavior of the management, which makes the management willing to conspire with the controlling shareholder to cause the excessive financialization of the enterprise. The results are especially evident among the uncertainty of economic policy is low, the industry competition is not fierce and the executives have overseas experience.</div
Mechanism test.
Based on the perspective of performance pressure, we explore the influence of controlling shareholders’ share pledge on excessive financialization behavior of enterprises and its internal mechanism. The results show that the share pledge of controlling shareholders is positively correlated with the excessive financialization behavior of enterprises. After the controlling shareholder’s share pledge, the actual performance of the enterprise is lower than expected, causing the short-sighted behavior of the management, which makes the management willing to conspire with the controlling shareholder to cause the excessive financialization of the enterprise. The results are especially evident among the uncertainty of economic policy is low, the industry competition is not fierce and the executives have overseas experience.</div
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