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In this paper, we are concerned with a class of parabolic-elliptic chemotaxissystems encompassing the prototype $$\left\{\begin{array}{lll} &u_t =\nabla\cdot(\nabla u-\chi u\nabla v)+f(u), & x\in \Omega, t>0, \\[0.2cm] &0=\Delta v -v+u^\kappa, & x\in \Omega, t>0 \end{array}\right. $$ with nonnegativeinitial condition for $u$ and homogeneous Neumann boundary conditions in asmooth bounded domain $\Omega\subset \mathbb{R}^n(n\geq 2)$, where $\chi>0$,$\kappa>0$ and $f$ is a smooth growth source satisfying $f(0)\geq 0$ and $$f(s)\leq a-bs^\theta, \quad s\geq 0, \text{with some} a\geq 0, b>0, \theta>1.$$ Firstly, it is shown, either $$ \kappa<\frac{2}{n}\quad \& \quad f\equiv 0,$$ or $$\theta>\kappa+1, $$ or $$ \theta-\kappa=1, \ \ b\geq \frac{(\kappan-2)}{\kappa n}\chi, \eqno(*) $$  that the corresponding initial-value problem admits a unique classicalsolution that is uniformly bounded in space and time. Our proof is elementaryand semigroup-free. Whilst, with the particular choices $\theta=2$ and$\kappa=1$, Tello and Winkler \cite{TW07} use sophisticated estimates via theNeumann heat semigroup to obtain the global boundedness under the strictinequality in ($\ast$). Thereby, we improve their results to the "borderline"case $b=(\kappa n-2)/(\kappa n)\chi$ in this regard. Next, for an unboundedrange of $\chi$, the system is shown to exhibit pattern formations, and, theemerging patterns are shown to converge weakly in $ L^\theta(\Omega)$ to someconstants as $\chi\rightarrow \infty$. While, for small $\chi$ or large damping$b$, precisely $b>2\chi$ if $f(u)=u(a-bu^\kappa)$ for some $a, b>0$, we showthat the system does not admit pattern formation and the large time behavior ofsolutions is comparable to its associated ODE+algebraic system.

A class of chemotaxis systems with growth source and nonlinear secretion