Gracilaria phuquocensis sp. nov., a new flattened Gracilaria species (Gracilariales, Rhodophyta), previously recognized as G. mammillaris, from the southern coast of Vietnam

© 2019 Japanese Society of Phycology Flattened Gracilaria species are widely distributed along the coasts of the South China Sea with more than 20 species recorded. Within the South China Sea, Gracilaria mammillaris has only been reported from Vietnam, but this species is likely restricted to the western Atlantic. This study aimed to reevaluate the taxonomic status of Vietnamese specimens of ‘G. mammillaris’ using combined morphological and molecular data. Our data clearly indicated that Vietnamese specimens were morphologically and genetically distinct from authentic G. mammillaris from the western Atlantic, and also other described flat Gracilaria species. We, therefore, propose that specimens from Vietnam originally identified as G. mammillaris be designated as a new species, Gracilaria phuquocensis sp. nov. Morphologically, G. phuquocensis can be distinguished from other flat Gracilaria species by its small thallus size, narrower blades, many medullary layers, abundant basal nutritive filaments within mature cystocarps, and tetrasporangial nemathecium. Our rbcL sequence analyses showed that the new species was sister to Gracilaria rhodymenioides from Thailand, and these two species formed a clade with cylindrical Gracilaria species. Our study contributes to clarification of the taxonomic status of misidentified specimens attributed to the flattened Gracilaria species in the South China Sea

Theorizing the relationship between the digital economy and firm productivity: The idiosyncrasies of firm-specific contexts

With the rise of emerging economies such as China, the research environment for the digital economy (DE) has changed significantly. However, our understanding of the productivity impact of DE development in Chinese firms remains in its infancy. The idiosyncrasies of the firm-specific contexts are closely related to further research on the this topic. As a baseline, we hypothesize a U-shaped DE-firm productivity (FP) relationship. We analyze the idiosyncratic influences of firm size and locality on the DE–FP relationship. The findings, which are based on a sample of Chinese firms from 2016 to 2019, show that (a) the U-shaped DE–FP relationship applies to Chinese firms; (b) this relationship is moderate for large firms, substantially steeper for medium firms, and inverted for small firms; (c) the U-shaped DE–FP relationship for eastern region firms is moderate, while the U-shaped relationship for central region firms is steep, but the transition is incomplete, and western region firms have experienced increasing productivity since the early stage of DE development. This study offers an alternative approach to understanding Chinese firms' strategic choices in DE development and provides a more nuanced explanation for the productivity paradox by emphasizing the significance of the firm-specific context. In this way, the study captures the sophisticated and constantly evolving relationships between DE and FP for heterogeneous Chinese firms

Longitudinal double-spin asymmetry and cross section for inclusive jet production in polarized proton collisions at square root of s = 200 GeV

We report a measurement of the longitudinal double-spin asymmetry A(LL) and the differential cross section for inclusive midrapidity jet production in polarized proton collisions at s=200 GeV. The cross section data cover transverse momenta 5 < p(T)< 50 GeV/c and agree with next-to-leading order perturbative QCD evaluations. The A(LL) data cover 5 < p(T)< 17 GeV/c and disfavor at 98% C.L. maximal positive gluon polarization in the polarized nucleon